| Message ID | 20170404063441.7656-1-quentin.schulz@free-electrons.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Lee, Just to make sure you didn't miss that patch (can't find it in for-mfd-next and for-mfd-next-next). Thanks, Quentin On 04/04/2017 08:34, Quentin Schulz wrote: > The X-Powers AXP20X and AXP22X PMICs have multiple ADCs. They expose the > battery voltage, battery charge and discharge currents, AC-in and VBUS > voltages and currents, 2 GPIOs muxable in ADC mode and PMIC temperature. > > This adds support for most of AXP20X and AXP22X ADCs. > > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> > Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> > Acked-by: Chen-Yu Tsai <wens@csie.org> > Reviewed-by: Jonathan Cameron <jic23@kernel.org> > --- > > Lee, could you merge this through the mfd tree please? > => https://lkml.org/lkml/2017/3/22/47 > > v4: > - added missing space at the beginning of a comment, > - tidied axp20x_adc_offset_voltage and axp20x_write_raw to use switch case > instead of if conditions, > - added MODULE_DEVICE_TABLE for axp20x_adc_id_match for module autoloading, > - merged two lines in axp20x_remove, > > v3: > - moved from switch to if condition in axp20x_adc_raw and > axp22x_adc_raw, > - removed DT support as DT node has been dropped, > - use of platform_device_id > - correctly defined the name of the iio device (name used to probe the > driver), > - added goto for errors in probe, > - added iio_map_array_unregister to the remove function, > > v2: > - removed unused defines, > - changed BIT(x) to 1 << x when describing bits purpose for which 2 << > x or 3 << x exists, to be consistent, > - changed ADC rate defines to macro formulas, > - reordered IIO channels, now different measures (current/voltage) of > the same part of the PMIC (e.g. battery), have the same IIO channel in > their respective IIO type. When a part of the PMIC have only one > measure, a number is jumped, > - left IIO channel mapping in DT to use iio_map structure, > - removed indexing of ADC internal temperature, > - removed unused iio_dev structure in axp20x_adc_iio, > - added a structure for data specific to AXP20X or AXP22X PMICs instead > of using an ID and an if condition when needing to separate the > behaviour of both, > - added a comment on batt_chrg_i really being on 12bits rather than > what the Chinese datasheets say (13 bits), > - corrected the offset for AXP22X PMIC temperature, > - set the ADC rate to a value (100Hz) shared by the AXP20X and AXP22X, > - created macro formulas to compute the ADC rate for each, > - added a condition on presence of ADC_EN2 reg before setting/resetting > it, > - switched from devm_iio_device_unregister to the non-devm function > because of the need for a remove function, > - removed some dead code, > > drivers/iio/adc/Kconfig | 10 + > drivers/iio/adc/Makefile | 1 + > drivers/iio/adc/axp20x_adc.c | 617 +++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 628 insertions(+) > create mode 100644 drivers/iio/adc/axp20x_adc.c > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > index d777a97..d15e1bd 100644 > --- a/drivers/iio/adc/Kconfig > +++ b/drivers/iio/adc/Kconfig > @@ -154,6 +154,16 @@ config AT91_SAMA5D2_ADC > To compile this driver as a module, choose M here: the module will be > called at91-sama5d2_adc. > > +config AXP20X_ADC > + tristate "X-Powers AXP20X and AXP22X ADC driver" > + depends on MFD_AXP20X > + help > + Say yes here to have support for X-Powers power management IC (PMIC) > + AXP20X and AXP22X ADC devices. > + > + To compile this driver as a module, choose M here: the module will be > + called axp20x_adc. > + > config AXP288_ADC > tristate "X-Powers AXP288 ADC driver" > depends on MFD_AXP20X > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > index b11bb57..17899b5 100644 > --- a/drivers/iio/adc/Makefile > +++ b/drivers/iio/adc/Makefile > @@ -16,6 +16,7 @@ obj-$(CONFIG_AD7887) += ad7887.o > obj-$(CONFIG_AD799X) += ad799x.o > obj-$(CONFIG_AT91_ADC) += at91_adc.o > obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o > +obj-$(CONFIG_AXP20X_ADC) += axp20x_adc.o > obj-$(CONFIG_AXP288_ADC) += axp288_adc.o > obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o > obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o > diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c > new file mode 100644 > index 0000000..11e1771 > --- /dev/null > +++ b/drivers/iio/adc/axp20x_adc.c > @@ -0,0 +1,617 @@ > +/* ADC driver for AXP20X and AXP22X PMICs > + * > + * Copyright (c) 2016 Free Electrons NextThing Co. > + * Quentin Schulz <quentin.schulz@free-electrons.com> > + * > + * This program is free software; you can redistribute it and/or modify it under > + * the terms of the GNU General Public License version 2 as published by the > + * Free Software Foundation. > + */ > + > +#include <linux/completion.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/regmap.h> > +#include <linux/thermal.h> > + > +#include <linux/iio/iio.h> > +#include <linux/iio/driver.h> > +#include <linux/iio/machine.h> > +#include <linux/mfd/axp20x.h> > + > +#define AXP20X_ADC_EN1_MASK GENMASK(7, 0) > + > +#define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7)) > +#define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0)) > + > +#define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0) > +#define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1) > +#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0)) > +#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) > + > +#define AXP20X_ADC_RATE_MASK GENMASK(7, 6) > +#define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK) > +#define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK) > + > +#define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ > + { \ > + .type = _type, \ > + .indexed = 1, \ > + .channel = _channel, \ > + .address = _reg, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > + BIT(IIO_CHAN_INFO_SCALE), \ > + .datasheet_name = _name, \ > + } > + > +#define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \ > + { \ > + .type = _type, \ > + .indexed = 1, \ > + .channel = _channel, \ > + .address = _reg, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > + BIT(IIO_CHAN_INFO_SCALE) |\ > + BIT(IIO_CHAN_INFO_OFFSET),\ > + .datasheet_name = _name, \ > + } > + > +struct axp_data; > + > +struct axp20x_adc_iio { > + struct regmap *regmap; > + struct axp_data *data; > +}; > + > +enum axp20x_adc_channel_v { > + AXP20X_ACIN_V = 0, > + AXP20X_VBUS_V, > + AXP20X_TS_IN, > + AXP20X_GPIO0_V, > + AXP20X_GPIO1_V, > + AXP20X_IPSOUT_V, > + AXP20X_BATT_V, > +}; > + > +enum axp20x_adc_channel_i { > + AXP20X_ACIN_I = 0, > + AXP20X_VBUS_I, > + AXP20X_BATT_CHRG_I, > + AXP20X_BATT_DISCHRG_I, > +}; > + > +enum axp22x_adc_channel_v { > + AXP22X_TS_IN = 0, > + AXP22X_BATT_V, > +}; > + > +enum axp22x_adc_channel_i { > + AXP22X_BATT_CHRG_I = 1, > + AXP22X_BATT_DISCHRG_I, > +}; > + > +static struct iio_map axp20x_maps[] = { > + { > + .consumer_dev_name = "axp20x-usb-power-supply", > + .consumer_channel = "vbus_v", > + .adc_channel_label = "vbus_v", > + }, { > + .consumer_dev_name = "axp20x-usb-power-supply", > + .consumer_channel = "vbus_i", > + .adc_channel_label = "vbus_i", > + }, { > + .consumer_dev_name = "axp20x-ac-power-supply", > + .consumer_channel = "acin_v", > + .adc_channel_label = "acin_v", > + }, { > + .consumer_dev_name = "axp20x-ac-power-supply", > + .consumer_channel = "acin_i", > + .adc_channel_label = "acin_i", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_v", > + .adc_channel_label = "batt_v", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_chrg_i", > + .adc_channel_label = "batt_chrg_i", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_dischrg_i", > + .adc_channel_label = "batt_dischrg_i", > + }, { /* sentinel */ } > +}; > + > +static struct iio_map axp22x_maps[] = { > + { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_v", > + .adc_channel_label = "batt_v", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_chrg_i", > + .adc_channel_label = "batt_chrg_i", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_dischrg_i", > + .adc_channel_label = "batt_dischrg_i", > + }, { /* sentinel */ } > +}; > + > +/* > + * Channels are mapped by physical system. Their channels share the same index. > + * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw. > + * The only exception is for the battery. batt_v will be in_voltage6_raw and > + * charge current in_current6_raw and discharge current will be in_current7_raw. > + */ > +static const struct iio_chan_spec axp20x_adc_channels[] = { > + AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE, > + AXP20X_ACIN_V_ADC_H), > + AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT, > + AXP20X_ACIN_I_ADC_H), > + AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE, > + AXP20X_VBUS_V_ADC_H), > + AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT, > + AXP20X_VBUS_I_ADC_H), > + { > + .type = IIO_TEMP, > + .address = AXP20X_TEMP_ADC_H, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > + BIT(IIO_CHAN_INFO_SCALE) | > + BIT(IIO_CHAN_INFO_OFFSET), > + .datasheet_name = "pmic_temp", > + }, > + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE, > + AXP20X_GPIO0_V_ADC_H), > + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE, > + AXP20X_GPIO1_V_ADC_H), > + AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE, > + AXP20X_IPSOUT_V_HIGH_H), > + AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE, > + AXP20X_BATT_V_H), > + AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > + AXP20X_BATT_CHRG_I_H), > + AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > + AXP20X_BATT_DISCHRG_I_H), > +}; > + > +static const struct iio_chan_spec axp22x_adc_channels[] = { > + { > + .type = IIO_TEMP, > + .address = AXP22X_PMIC_TEMP_H, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > + BIT(IIO_CHAN_INFO_SCALE) | > + BIT(IIO_CHAN_INFO_OFFSET), > + .datasheet_name = "pmic_temp", > + }, > + AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE, > + AXP20X_BATT_V_H), > + AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > + AXP20X_BATT_CHRG_I_H), > + AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > + AXP20X_BATT_DISCHRG_I_H), > +}; > + > +static int axp20x_adc_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val) > +{ > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + int size = 12; > + > + /* > + * N.B.: Unlike the Chinese datasheets tell, the charging current is > + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > + * bits. > + */ > + if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I) > + size = 13; > + else > + size = 12; > + > + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > + if (*val < 0) > + return *val; > + > + return IIO_VAL_INT; > +} > + > +static int axp22x_adc_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val) > +{ > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + int size; > + > + /* > + * N.B.: Unlike the Chinese datasheets tell, the charging current is > + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > + * bits. > + */ > + if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I) > + size = 13; > + else > + size = 12; > + > + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > + if (*val < 0) > + return *val; > + > + return IIO_VAL_INT; > +} > + > +static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) > +{ > + switch (channel) { > + case AXP20X_ACIN_V: > + case AXP20X_VBUS_V: > + *val = 1; > + *val2 = 700000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_GPIO0_V: > + case AXP20X_GPIO1_V: > + *val = 0; > + *val2 = 500000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_BATT_V: > + *val = 1; > + *val2 = 100000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_IPSOUT_V: > + *val = 1; > + *val2 = 400000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_adc_scale_current(int channel, int *val, int *val2) > +{ > + switch (channel) { > + case AXP20X_ACIN_I: > + *val = 0; > + *val2 = 625000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_VBUS_I: > + *val = 0; > + *val2 = 375000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_BATT_DISCHRG_I: > + case AXP20X_BATT_CHRG_I: > + *val = 0; > + *val2 = 500000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val, > + int *val2) > +{ > + switch (chan->type) { > + case IIO_VOLTAGE: > + return axp20x_adc_scale_voltage(chan->channel, val, val2); > + > + case IIO_CURRENT: > + return axp20x_adc_scale_current(chan->channel, val, val2); > + > + case IIO_TEMP: > + *val = 100; > + return IIO_VAL_INT; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, > + int *val2) > +{ > + switch (chan->type) { > + case IIO_VOLTAGE: > + if (chan->channel != AXP22X_BATT_V) > + return -EINVAL; > + > + *val = 1; > + *val2 = 100000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case IIO_CURRENT: > + *val = 0; > + *val2 = 500000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case IIO_TEMP: > + *val = 100; > + return IIO_VAL_INT; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel, > + int *val) > +{ > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + int ret; > + > + ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val); > + if (ret < 0) > + return ret; > + > + switch (channel) { > + case AXP20X_GPIO0_V: > + *val &= AXP20X_GPIO10_IN_RANGE_GPIO0; > + break; > + > + case AXP20X_GPIO1_V: > + *val &= AXP20X_GPIO10_IN_RANGE_GPIO1; > + break; > + > + default: > + return -EINVAL; > + } > + > + *val = !!(*val) * 700000; > + > + return IIO_VAL_INT; > +} > + > +static int axp20x_adc_offset(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val) > +{ > + switch (chan->type) { > + case IIO_VOLTAGE: > + return axp20x_adc_offset_voltage(indio_dev, chan->channel, val); > + > + case IIO_TEMP: > + *val = -1447; > + return IIO_VAL_INT; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val, > + int *val2, long mask) > +{ > + switch (mask) { > + case IIO_CHAN_INFO_OFFSET: > + return axp20x_adc_offset(indio_dev, chan, val); > + > + case IIO_CHAN_INFO_SCALE: > + return axp20x_adc_scale(chan, val, val2); > + > + case IIO_CHAN_INFO_RAW: > + return axp20x_adc_raw(indio_dev, chan, val); > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp22x_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val, > + int *val2, long mask) > +{ > + switch (mask) { > + case IIO_CHAN_INFO_OFFSET: > + *val = -2677; > + return IIO_VAL_INT; > + > + case IIO_CHAN_INFO_SCALE: > + return axp22x_adc_scale(chan, val, val2); > + > + case IIO_CHAN_INFO_RAW: > + return axp22x_adc_raw(indio_dev, chan, val); > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_write_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int val, int val2, > + long mask) > +{ > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + unsigned int reg, regval; > + > + /* > + * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets > + * for (independently) GPIO0 and GPIO1 when in ADC mode. > + */ > + if (mask != IIO_CHAN_INFO_OFFSET) > + return -EINVAL; > + > + if (val != 0 && val != 700000) > + return -EINVAL; > + > + switch (chan->channel) { > + case AXP20X_GPIO0_V: > + reg = AXP20X_GPIO10_IN_RANGE_GPIO0; > + regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val); > + break; > + > + case AXP20X_GPIO1_V: > + reg = AXP20X_GPIO10_IN_RANGE_GPIO1; > + regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val); > + break; > + > + default: > + return -EINVAL; > + } > + > + return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg, > + regval); > +} > + > +static const struct iio_info axp20x_adc_iio_info = { > + .read_raw = axp20x_read_raw, > + .write_raw = axp20x_write_raw, > + .driver_module = THIS_MODULE, > +}; > + > +static const struct iio_info axp22x_adc_iio_info = { > + .read_raw = axp22x_read_raw, > + .driver_module = THIS_MODULE, > +}; > + > +static int axp20x_adc_rate(int rate) > +{ > + return AXP20X_ADC_RATE_HZ(rate); > +} > + > +static int axp22x_adc_rate(int rate) > +{ > + return AXP22X_ADC_RATE_HZ(rate); > +} > + > +struct axp_data { > + const struct iio_info *iio_info; > + int num_channels; > + struct iio_chan_spec const *channels; > + unsigned long adc_en1_mask; > + int (*adc_rate)(int rate); > + bool adc_en2; > + struct iio_map *maps; > +}; > + > +static const struct axp_data axp20x_data = { > + .iio_info = &axp20x_adc_iio_info, > + .num_channels = ARRAY_SIZE(axp20x_adc_channels), > + .channels = axp20x_adc_channels, > + .adc_en1_mask = AXP20X_ADC_EN1_MASK, > + .adc_rate = axp20x_adc_rate, > + .adc_en2 = true, > + .maps = axp20x_maps, > +}; > + > +static const struct axp_data axp22x_data = { > + .iio_info = &axp22x_adc_iio_info, > + .num_channels = ARRAY_SIZE(axp22x_adc_channels), > + .channels = axp22x_adc_channels, > + .adc_en1_mask = AXP22X_ADC_EN1_MASK, > + .adc_rate = axp22x_adc_rate, > + .adc_en2 = false, > + .maps = axp22x_maps, > +}; > + > +static const struct platform_device_id axp20x_adc_id_match[] = { > + { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, }, > + { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, }, > + { /* sentinel */ }, > +}; > +MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); > + > +static int axp20x_probe(struct platform_device *pdev) > +{ > + struct axp20x_adc_iio *info; > + struct iio_dev *indio_dev; > + struct axp20x_dev *axp20x_dev; > + int ret; > + > + axp20x_dev = dev_get_drvdata(pdev->dev.parent); > + > + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); > + if (!indio_dev) > + return -ENOMEM; > + > + info = iio_priv(indio_dev); > + platform_set_drvdata(pdev, indio_dev); > + > + info->regmap = axp20x_dev->regmap; > + indio_dev->dev.parent = &pdev->dev; > + indio_dev->dev.of_node = pdev->dev.of_node; > + indio_dev->modes = INDIO_DIRECT_MODE; > + > + info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data; > + > + indio_dev->name = platform_get_device_id(pdev)->name; > + indio_dev->info = info->data->iio_info; > + indio_dev->num_channels = info->data->num_channels; > + indio_dev->channels = info->data->channels; > + > + /* Enable the ADCs on IP */ > + regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask); > + > + if (info->data->adc_en2) > + /* Enable GPIO0/1 and internal temperature ADCs */ > + regmap_update_bits(info->regmap, AXP20X_ADC_EN2, > + AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK); > + > + /* Configure ADCs rate */ > + regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK, > + info->data->adc_rate(100)); > + > + ret = iio_map_array_register(indio_dev, info->data->maps); > + if (ret < 0) { > + dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret); > + goto fail_map; > + } > + > + ret = iio_device_register(indio_dev); > + if (ret < 0) { > + dev_err(&pdev->dev, "could not register the device\n"); > + goto fail_register; > + } > + > + return 0; > + > +fail_register: > + iio_map_array_unregister(indio_dev); > + > +fail_map: > + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > + > + if (info->data->adc_en2) > + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > + > + return ret; > +} > + > +static int axp20x_remove(struct platform_device *pdev) > +{ > + struct iio_dev *indio_dev = platform_get_drvdata(pdev); > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + > + iio_device_unregister(indio_dev); > + iio_map_array_unregister(indio_dev); > + > + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > + > + if (info->data->adc_en2) > + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > + > + return 0; > +} > + > +static struct platform_driver axp20x_adc_driver = { > + .driver = { > + .name = "axp20x-adc", > + }, > + .id_table = axp20x_adc_id_match, > + .probe = axp20x_probe, > + .remove = axp20x_remove, > +}; > + > +module_platform_driver(axp20x_adc_driver); > + > +MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs"); > +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); > +MODULE_LICENSE("GPL"); >
On Mon, 10 Apr 2017, Quentin Schulz wrote: > Hi Lee, > > Just to make sure you didn't miss that patch (can't find it in > for-mfd-next and for-mfd-next-next). It has not been missed, but is yet to be reviewed. > On 04/04/2017 08:34, Quentin Schulz wrote: > > The X-Powers AXP20X and AXP22X PMICs have multiple ADCs. They expose the > > battery voltage, battery charge and discharge currents, AC-in and VBUS > > voltages and currents, 2 GPIOs muxable in ADC mode and PMIC temperature. > > > > This adds support for most of AXP20X and AXP22X ADCs. > > > > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> > > Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> > > Acked-by: Chen-Yu Tsai <wens@csie.org> > > Reviewed-by: Jonathan Cameron <jic23@kernel.org> > > --- > > > > Lee, could you merge this through the mfd tree please? > > => https://lkml.org/lkml/2017/3/22/47 > > > > v4: > > - added missing space at the beginning of a comment, > > - tidied axp20x_adc_offset_voltage and axp20x_write_raw to use switch case > > instead of if conditions, > > - added MODULE_DEVICE_TABLE for axp20x_adc_id_match for module autoloading, > > - merged two lines in axp20x_remove, > > > > v3: > > - moved from switch to if condition in axp20x_adc_raw and > > axp22x_adc_raw, > > - removed DT support as DT node has been dropped, > > - use of platform_device_id > > - correctly defined the name of the iio device (name used to probe the > > driver), > > - added goto for errors in probe, > > - added iio_map_array_unregister to the remove function, > > > > v2: > > - removed unused defines, > > - changed BIT(x) to 1 << x when describing bits purpose for which 2 << > > x or 3 << x exists, to be consistent, > > - changed ADC rate defines to macro formulas, > > - reordered IIO channels, now different measures (current/voltage) of > > the same part of the PMIC (e.g. battery), have the same IIO channel in > > their respective IIO type. When a part of the PMIC have only one > > measure, a number is jumped, > > - left IIO channel mapping in DT to use iio_map structure, > > - removed indexing of ADC internal temperature, > > - removed unused iio_dev structure in axp20x_adc_iio, > > - added a structure for data specific to AXP20X or AXP22X PMICs instead > > of using an ID and an if condition when needing to separate the > > behaviour of both, > > - added a comment on batt_chrg_i really being on 12bits rather than > > what the Chinese datasheets say (13 bits), > > - corrected the offset for AXP22X PMIC temperature, > > - set the ADC rate to a value (100Hz) shared by the AXP20X and AXP22X, > > - created macro formulas to compute the ADC rate for each, > > - added a condition on presence of ADC_EN2 reg before setting/resetting > > it, > > - switched from devm_iio_device_unregister to the non-devm function > > because of the need for a remove function, > > - removed some dead code, > > > > drivers/iio/adc/Kconfig | 10 + > > drivers/iio/adc/Makefile | 1 + > > drivers/iio/adc/axp20x_adc.c | 617 +++++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 628 insertions(+) > > create mode 100644 drivers/iio/adc/axp20x_adc.c > > > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > > index d777a97..d15e1bd 100644 > > --- a/drivers/iio/adc/Kconfig > > +++ b/drivers/iio/adc/Kconfig > > @@ -154,6 +154,16 @@ config AT91_SAMA5D2_ADC > > To compile this driver as a module, choose M here: the module will be > > called at91-sama5d2_adc. > > > > +config AXP20X_ADC > > + tristate "X-Powers AXP20X and AXP22X ADC driver" > > + depends on MFD_AXP20X > > + help > > + Say yes here to have support for X-Powers power management IC (PMIC) > > + AXP20X and AXP22X ADC devices. > > + > > + To compile this driver as a module, choose M here: the module will be > > + called axp20x_adc. > > + > > config AXP288_ADC > > tristate "X-Powers AXP288 ADC driver" > > depends on MFD_AXP20X > > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > > index b11bb57..17899b5 100644 > > --- a/drivers/iio/adc/Makefile > > +++ b/drivers/iio/adc/Makefile > > @@ -16,6 +16,7 @@ obj-$(CONFIG_AD7887) += ad7887.o > > obj-$(CONFIG_AD799X) += ad799x.o > > obj-$(CONFIG_AT91_ADC) += at91_adc.o > > obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o > > +obj-$(CONFIG_AXP20X_ADC) += axp20x_adc.o > > obj-$(CONFIG_AXP288_ADC) += axp288_adc.o > > obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o > > obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o > > diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c > > new file mode 100644 > > index 0000000..11e1771 > > --- /dev/null > > +++ b/drivers/iio/adc/axp20x_adc.c > > @@ -0,0 +1,617 @@ > > +/* ADC driver for AXP20X and AXP22X PMICs > > + * > > + * Copyright (c) 2016 Free Electrons NextThing Co. > > + * Quentin Schulz <quentin.schulz@free-electrons.com> > > + * > > + * This program is free software; you can redistribute it and/or modify it under > > + * the terms of the GNU General Public License version 2 as published by the > > + * Free Software Foundation. > > + */ > > + > > +#include <linux/completion.h> > > +#include <linux/interrupt.h> > > +#include <linux/io.h> > > +#include <linux/module.h> > > +#include <linux/of.h> > > +#include <linux/of_device.h> > > +#include <linux/platform_device.h> > > +#include <linux/pm_runtime.h> > > +#include <linux/regmap.h> > > +#include <linux/thermal.h> > > + > > +#include <linux/iio/iio.h> > > +#include <linux/iio/driver.h> > > +#include <linux/iio/machine.h> > > +#include <linux/mfd/axp20x.h> > > + > > +#define AXP20X_ADC_EN1_MASK GENMASK(7, 0) > > + > > +#define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7)) > > +#define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0)) > > + > > +#define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0) > > +#define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1) > > +#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0)) > > +#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) > > + > > +#define AXP20X_ADC_RATE_MASK GENMASK(7, 6) > > +#define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK) > > +#define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK) > > + > > +#define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ > > + { \ > > + .type = _type, \ > > + .indexed = 1, \ > > + .channel = _channel, \ > > + .address = _reg, \ > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > > + BIT(IIO_CHAN_INFO_SCALE), \ > > + .datasheet_name = _name, \ > > + } > > + > > +#define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \ > > + { \ > > + .type = _type, \ > > + .indexed = 1, \ > > + .channel = _channel, \ > > + .address = _reg, \ > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > > + BIT(IIO_CHAN_INFO_SCALE) |\ > > + BIT(IIO_CHAN_INFO_OFFSET),\ > > + .datasheet_name = _name, \ > > + } > > + > > +struct axp_data; > > + > > +struct axp20x_adc_iio { > > + struct regmap *regmap; > > + struct axp_data *data; > > +}; > > + > > +enum axp20x_adc_channel_v { > > + AXP20X_ACIN_V = 0, > > + AXP20X_VBUS_V, > > + AXP20X_TS_IN, > > + AXP20X_GPIO0_V, > > + AXP20X_GPIO1_V, > > + AXP20X_IPSOUT_V, > > + AXP20X_BATT_V, > > +}; > > + > > +enum axp20x_adc_channel_i { > > + AXP20X_ACIN_I = 0, > > + AXP20X_VBUS_I, > > + AXP20X_BATT_CHRG_I, > > + AXP20X_BATT_DISCHRG_I, > > +}; > > + > > +enum axp22x_adc_channel_v { > > + AXP22X_TS_IN = 0, > > + AXP22X_BATT_V, > > +}; > > + > > +enum axp22x_adc_channel_i { > > + AXP22X_BATT_CHRG_I = 1, > > + AXP22X_BATT_DISCHRG_I, > > +}; > > + > > +static struct iio_map axp20x_maps[] = { > > + { > > + .consumer_dev_name = "axp20x-usb-power-supply", > > + .consumer_channel = "vbus_v", > > + .adc_channel_label = "vbus_v", > > + }, { > > + .consumer_dev_name = "axp20x-usb-power-supply", > > + .consumer_channel = "vbus_i", > > + .adc_channel_label = "vbus_i", > > + }, { > > + .consumer_dev_name = "axp20x-ac-power-supply", > > + .consumer_channel = "acin_v", > > + .adc_channel_label = "acin_v", > > + }, { > > + .consumer_dev_name = "axp20x-ac-power-supply", > > + .consumer_channel = "acin_i", > > + .adc_channel_label = "acin_i", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_v", > > + .adc_channel_label = "batt_v", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_chrg_i", > > + .adc_channel_label = "batt_chrg_i", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_dischrg_i", > > + .adc_channel_label = "batt_dischrg_i", > > + }, { /* sentinel */ } > > +}; > > + > > +static struct iio_map axp22x_maps[] = { > > + { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_v", > > + .adc_channel_label = "batt_v", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_chrg_i", > > + .adc_channel_label = "batt_chrg_i", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_dischrg_i", > > + .adc_channel_label = "batt_dischrg_i", > > + }, { /* sentinel */ } > > +}; > > + > > +/* > > + * Channels are mapped by physical system. Their channels share the same index. > > + * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw. > > + * The only exception is for the battery. batt_v will be in_voltage6_raw and > > + * charge current in_current6_raw and discharge current will be in_current7_raw. > > + */ > > +static const struct iio_chan_spec axp20x_adc_channels[] = { > > + AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE, > > + AXP20X_ACIN_V_ADC_H), > > + AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT, > > + AXP20X_ACIN_I_ADC_H), > > + AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE, > > + AXP20X_VBUS_V_ADC_H), > > + AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT, > > + AXP20X_VBUS_I_ADC_H), > > + { > > + .type = IIO_TEMP, > > + .address = AXP20X_TEMP_ADC_H, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > > + BIT(IIO_CHAN_INFO_SCALE) | > > + BIT(IIO_CHAN_INFO_OFFSET), > > + .datasheet_name = "pmic_temp", > > + }, > > + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE, > > + AXP20X_GPIO0_V_ADC_H), > > + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE, > > + AXP20X_GPIO1_V_ADC_H), > > + AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE, > > + AXP20X_IPSOUT_V_HIGH_H), > > + AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE, > > + AXP20X_BATT_V_H), > > + AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > > + AXP20X_BATT_CHRG_I_H), > > + AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > > + AXP20X_BATT_DISCHRG_I_H), > > +}; > > + > > +static const struct iio_chan_spec axp22x_adc_channels[] = { > > + { > > + .type = IIO_TEMP, > > + .address = AXP22X_PMIC_TEMP_H, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > > + BIT(IIO_CHAN_INFO_SCALE) | > > + BIT(IIO_CHAN_INFO_OFFSET), > > + .datasheet_name = "pmic_temp", > > + }, > > + AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE, > > + AXP20X_BATT_V_H), > > + AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > > + AXP20X_BATT_CHRG_I_H), > > + AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > > + AXP20X_BATT_DISCHRG_I_H), > > +}; > > + > > +static int axp20x_adc_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val) > > +{ > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + int size = 12; > > + > > + /* > > + * N.B.: Unlike the Chinese datasheets tell, the charging current is > > + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > > + * bits. > > + */ > > + if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I) > > + size = 13; > > + else > > + size = 12; > > + > > + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > > + if (*val < 0) > > + return *val; > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int axp22x_adc_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val) > > +{ > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + int size; > > + > > + /* > > + * N.B.: Unlike the Chinese datasheets tell, the charging current is > > + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > > + * bits. > > + */ > > + if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I) > > + size = 13; > > + else > > + size = 12; > > + > > + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > > + if (*val < 0) > > + return *val; > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) > > +{ > > + switch (channel) { > > + case AXP20X_ACIN_V: > > + case AXP20X_VBUS_V: > > + *val = 1; > > + *val2 = 700000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_GPIO0_V: > > + case AXP20X_GPIO1_V: > > + *val = 0; > > + *val2 = 500000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_BATT_V: > > + *val = 1; > > + *val2 = 100000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_IPSOUT_V: > > + *val = 1; > > + *val2 = 400000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_adc_scale_current(int channel, int *val, int *val2) > > +{ > > + switch (channel) { > > + case AXP20X_ACIN_I: > > + *val = 0; > > + *val2 = 625000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_VBUS_I: > > + *val = 0; > > + *val2 = 375000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_BATT_DISCHRG_I: > > + case AXP20X_BATT_CHRG_I: > > + *val = 0; > > + *val2 = 500000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val, > > + int *val2) > > +{ > > + switch (chan->type) { > > + case IIO_VOLTAGE: > > + return axp20x_adc_scale_voltage(chan->channel, val, val2); > > + > > + case IIO_CURRENT: > > + return axp20x_adc_scale_current(chan->channel, val, val2); > > + > > + case IIO_TEMP: > > + *val = 100; > > + return IIO_VAL_INT; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, > > + int *val2) > > +{ > > + switch (chan->type) { > > + case IIO_VOLTAGE: > > + if (chan->channel != AXP22X_BATT_V) > > + return -EINVAL; > > + > > + *val = 1; > > + *val2 = 100000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case IIO_CURRENT: > > + *val = 0; > > + *val2 = 500000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case IIO_TEMP: > > + *val = 100; > > + return IIO_VAL_INT; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel, > > + int *val) > > +{ > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + int ret; > > + > > + ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val); > > + if (ret < 0) > > + return ret; > > + > > + switch (channel) { > > + case AXP20X_GPIO0_V: > > + *val &= AXP20X_GPIO10_IN_RANGE_GPIO0; > > + break; > > + > > + case AXP20X_GPIO1_V: > > + *val &= AXP20X_GPIO10_IN_RANGE_GPIO1; > > + break; > > + > > + default: > > + return -EINVAL; > > + } > > + > > + *val = !!(*val) * 700000; > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int axp20x_adc_offset(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val) > > +{ > > + switch (chan->type) { > > + case IIO_VOLTAGE: > > + return axp20x_adc_offset_voltage(indio_dev, chan->channel, val); > > + > > + case IIO_TEMP: > > + *val = -1447; > > + return IIO_VAL_INT; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_read_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val, > > + int *val2, long mask) > > +{ > > + switch (mask) { > > + case IIO_CHAN_INFO_OFFSET: > > + return axp20x_adc_offset(indio_dev, chan, val); > > + > > + case IIO_CHAN_INFO_SCALE: > > + return axp20x_adc_scale(chan, val, val2); > > + > > + case IIO_CHAN_INFO_RAW: > > + return axp20x_adc_raw(indio_dev, chan, val); > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp22x_read_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val, > > + int *val2, long mask) > > +{ > > + switch (mask) { > > + case IIO_CHAN_INFO_OFFSET: > > + *val = -2677; > > + return IIO_VAL_INT; > > + > > + case IIO_CHAN_INFO_SCALE: > > + return axp22x_adc_scale(chan, val, val2); > > + > > + case IIO_CHAN_INFO_RAW: > > + return axp22x_adc_raw(indio_dev, chan, val); > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_write_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int val, int val2, > > + long mask) > > +{ > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + unsigned int reg, regval; > > + > > + /* > > + * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets > > + * for (independently) GPIO0 and GPIO1 when in ADC mode. > > + */ > > + if (mask != IIO_CHAN_INFO_OFFSET) > > + return -EINVAL; > > + > > + if (val != 0 && val != 700000) > > + return -EINVAL; > > + > > + switch (chan->channel) { > > + case AXP20X_GPIO0_V: > > + reg = AXP20X_GPIO10_IN_RANGE_GPIO0; > > + regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val); > > + break; > > + > > + case AXP20X_GPIO1_V: > > + reg = AXP20X_GPIO10_IN_RANGE_GPIO1; > > + regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val); > > + break; > > + > > + default: > > + return -EINVAL; > > + } > > + > > + return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg, > > + regval); > > +} > > + > > +static const struct iio_info axp20x_adc_iio_info = { > > + .read_raw = axp20x_read_raw, > > + .write_raw = axp20x_write_raw, > > + .driver_module = THIS_MODULE, > > +}; > > + > > +static const struct iio_info axp22x_adc_iio_info = { > > + .read_raw = axp22x_read_raw, > > + .driver_module = THIS_MODULE, > > +}; > > + > > +static int axp20x_adc_rate(int rate) > > +{ > > + return AXP20X_ADC_RATE_HZ(rate); > > +} > > + > > +static int axp22x_adc_rate(int rate) > > +{ > > + return AXP22X_ADC_RATE_HZ(rate); > > +} > > + > > +struct axp_data { > > + const struct iio_info *iio_info; > > + int num_channels; > > + struct iio_chan_spec const *channels; > > + unsigned long adc_en1_mask; > > + int (*adc_rate)(int rate); > > + bool adc_en2; > > + struct iio_map *maps; > > +}; > > + > > +static const struct axp_data axp20x_data = { > > + .iio_info = &axp20x_adc_iio_info, > > + .num_channels = ARRAY_SIZE(axp20x_adc_channels), > > + .channels = axp20x_adc_channels, > > + .adc_en1_mask = AXP20X_ADC_EN1_MASK, > > + .adc_rate = axp20x_adc_rate, > > + .adc_en2 = true, > > + .maps = axp20x_maps, > > +}; > > + > > +static const struct axp_data axp22x_data = { > > + .iio_info = &axp22x_adc_iio_info, > > + .num_channels = ARRAY_SIZE(axp22x_adc_channels), > > + .channels = axp22x_adc_channels, > > + .adc_en1_mask = AXP22X_ADC_EN1_MASK, > > + .adc_rate = axp22x_adc_rate, > > + .adc_en2 = false, > > + .maps = axp22x_maps, > > +}; > > + > > +static const struct platform_device_id axp20x_adc_id_match[] = { > > + { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, }, > > + { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, }, > > + { /* sentinel */ }, > > +}; > > +MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); > > + > > +static int axp20x_probe(struct platform_device *pdev) > > +{ > > + struct axp20x_adc_iio *info; > > + struct iio_dev *indio_dev; > > + struct axp20x_dev *axp20x_dev; > > + int ret; > > + > > + axp20x_dev = dev_get_drvdata(pdev->dev.parent); > > + > > + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); > > + if (!indio_dev) > > + return -ENOMEM; > > + > > + info = iio_priv(indio_dev); > > + platform_set_drvdata(pdev, indio_dev); > > + > > + info->regmap = axp20x_dev->regmap; > > + indio_dev->dev.parent = &pdev->dev; > > + indio_dev->dev.of_node = pdev->dev.of_node; > > + indio_dev->modes = INDIO_DIRECT_MODE; > > + > > + info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data; > > + > > + indio_dev->name = platform_get_device_id(pdev)->name; > > + indio_dev->info = info->data->iio_info; > > + indio_dev->num_channels = info->data->num_channels; > > + indio_dev->channels = info->data->channels; > > + > > + /* Enable the ADCs on IP */ > > + regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask); > > + > > + if (info->data->adc_en2) > > + /* Enable GPIO0/1 and internal temperature ADCs */ > > + regmap_update_bits(info->regmap, AXP20X_ADC_EN2, > > + AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK); > > + > > + /* Configure ADCs rate */ > > + regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK, > > + info->data->adc_rate(100)); > > + > > + ret = iio_map_array_register(indio_dev, info->data->maps); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret); > > + goto fail_map; > > + } > > + > > + ret = iio_device_register(indio_dev); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "could not register the device\n"); > > + goto fail_register; > > + } > > + > > + return 0; > > + > > +fail_register: > > + iio_map_array_unregister(indio_dev); > > + > > +fail_map: > > + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > > + > > + if (info->data->adc_en2) > > + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > > + > > + return ret; > > +} > > + > > +static int axp20x_remove(struct platform_device *pdev) > > +{ > > + struct iio_dev *indio_dev = platform_get_drvdata(pdev); > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + > > + iio_device_unregister(indio_dev); > > + iio_map_array_unregister(indio_dev); > > + > > + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > > + > > + if (info->data->adc_en2) > > + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > > + > > + return 0; > > +} > > + > > +static struct platform_driver axp20x_adc_driver = { > > + .driver = { > > + .name = "axp20x-adc", > > + }, > > + .id_table = axp20x_adc_id_match, > > + .probe = axp20x_probe, > > + .remove = axp20x_remove, > > +}; > > + > > +module_platform_driver(axp20x_adc_driver); > > + > > +MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs"); > > +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); > > +MODULE_LICENSE("GPL"); > > >
Hi Lee, On 10/04/2017 16:54, Lee Jones wrote: > On Mon, 10 Apr 2017, Quentin Schulz wrote: > >> Hi Lee, >> >> Just to make sure you didn't miss that patch (can't find it in >> for-mfd-next and for-mfd-next-next). > > It has not been missed, but is yet to be reviewed. > Hum.. What do you mean exactly? The maintainer of the AXP PMICs has given its Acked-by and the maintainer of the IIO subsystem has given its Reviewed-by. Is there something I'm missing (in your workflow maybe)? Thanks, Quentin >> On 04/04/2017 08:34, Quentin Schulz wrote: >>> The X-Powers AXP20X and AXP22X PMICs have multiple ADCs. They expose the >>> battery voltage, battery charge and discharge currents, AC-in and VBUS >>> voltages and currents, 2 GPIOs muxable in ADC mode and PMIC temperature. >>> >>> This adds support for most of AXP20X and AXP22X ADCs. >>> >>> Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> >>> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> >>> Acked-by: Chen-Yu Tsai <wens@csie.org> >>> Reviewed-by: Jonathan Cameron <jic23@kernel.org> >>> --- >>> >>> Lee, could you merge this through the mfd tree please? >>> => https://lkml.org/lkml/2017/3/22/47 >>> >>> v4: >>> - added missing space at the beginning of a comment, >>> - tidied axp20x_adc_offset_voltage and axp20x_write_raw to use switch case >>> instead of if conditions, >>> - added MODULE_DEVICE_TABLE for axp20x_adc_id_match for module autoloading, >>> - merged two lines in axp20x_remove, >>> >>> v3: >>> - moved from switch to if condition in axp20x_adc_raw and >>> axp22x_adc_raw, >>> - removed DT support as DT node has been dropped, >>> - use of platform_device_id >>> - correctly defined the name of the iio device (name used to probe the >>> driver), >>> - added goto for errors in probe, >>> - added iio_map_array_unregister to the remove function, >>> >>> v2: >>> - removed unused defines, >>> - changed BIT(x) to 1 << x when describing bits purpose for which 2 << >>> x or 3 << x exists, to be consistent, >>> - changed ADC rate defines to macro formulas, >>> - reordered IIO channels, now different measures (current/voltage) of >>> the same part of the PMIC (e.g. battery), have the same IIO channel in >>> their respective IIO type. When a part of the PMIC have only one >>> measure, a number is jumped, >>> - left IIO channel mapping in DT to use iio_map structure, >>> - removed indexing of ADC internal temperature, >>> - removed unused iio_dev structure in axp20x_adc_iio, >>> - added a structure for data specific to AXP20X or AXP22X PMICs instead >>> of using an ID and an if condition when needing to separate the >>> behaviour of both, >>> - added a comment on batt_chrg_i really being on 12bits rather than >>> what the Chinese datasheets say (13 bits), >>> - corrected the offset for AXP22X PMIC temperature, >>> - set the ADC rate to a value (100Hz) shared by the AXP20X and AXP22X, >>> - created macro formulas to compute the ADC rate for each, >>> - added a condition on presence of ADC_EN2 reg before setting/resetting >>> it, >>> - switched from devm_iio_device_unregister to the non-devm function >>> because of the need for a remove function, >>> - removed some dead code, >>> >>> drivers/iio/adc/Kconfig | 10 + >>> drivers/iio/adc/Makefile | 1 + >>> drivers/iio/adc/axp20x_adc.c | 617 +++++++++++++++++++++++++++++++++++++++++++ >>> 3 files changed, 628 insertions(+) >>> create mode 100644 drivers/iio/adc/axp20x_adc.c >>> >>> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig >>> index d777a97..d15e1bd 100644 >>> --- a/drivers/iio/adc/Kconfig >>> +++ b/drivers/iio/adc/Kconfig >>> @@ -154,6 +154,16 @@ config AT91_SAMA5D2_ADC >>> To compile this driver as a module, choose M here: the module will be >>> called at91-sama5d2_adc. >>> >>> +config AXP20X_ADC >>> + tristate "X-Powers AXP20X and AXP22X ADC driver" >>> + depends on MFD_AXP20X >>> + help >>> + Say yes here to have support for X-Powers power management IC (PMIC) >>> + AXP20X and AXP22X ADC devices. >>> + >>> + To compile this driver as a module, choose M here: the module will be >>> + called axp20x_adc. >>> + >>> config AXP288_ADC >>> tristate "X-Powers AXP288 ADC driver" >>> depends on MFD_AXP20X >>> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile >>> index b11bb57..17899b5 100644 >>> --- a/drivers/iio/adc/Makefile >>> +++ b/drivers/iio/adc/Makefile >>> @@ -16,6 +16,7 @@ obj-$(CONFIG_AD7887) += ad7887.o >>> obj-$(CONFIG_AD799X) += ad799x.o >>> obj-$(CONFIG_AT91_ADC) += at91_adc.o >>> obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o >>> +obj-$(CONFIG_AXP20X_ADC) += axp20x_adc.o >>> obj-$(CONFIG_AXP288_ADC) += axp288_adc.o >>> obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o >>> obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o >>> diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c >>> new file mode 100644 >>> index 0000000..11e1771 >>> --- /dev/null >>> +++ b/drivers/iio/adc/axp20x_adc.c >>> @@ -0,0 +1,617 @@ >>> +/* ADC driver for AXP20X and AXP22X PMICs >>> + * >>> + * Copyright (c) 2016 Free Electrons NextThing Co. >>> + * Quentin Schulz <quentin.schulz@free-electrons.com> >>> + * >>> + * This program is free software; you can redistribute it and/or modify it under >>> + * the terms of the GNU General Public License version 2 as published by the >>> + * Free Software Foundation. >>> + */ >>> + >>> +#include <linux/completion.h> >>> +#include <linux/interrupt.h> >>> +#include <linux/io.h> >>> +#include <linux/module.h> >>> +#include <linux/of.h> >>> +#include <linux/of_device.h> >>> +#include <linux/platform_device.h> >>> +#include <linux/pm_runtime.h> >>> +#include <linux/regmap.h> >>> +#include <linux/thermal.h> >>> + >>> +#include <linux/iio/iio.h> >>> +#include <linux/iio/driver.h> >>> +#include <linux/iio/machine.h> >>> +#include <linux/mfd/axp20x.h> >>> + >>> +#define AXP20X_ADC_EN1_MASK GENMASK(7, 0) >>> + >>> +#define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7)) >>> +#define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0)) >>> + >>> +#define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0) >>> +#define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1) >>> +#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0)) >>> +#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) >>> + >>> +#define AXP20X_ADC_RATE_MASK GENMASK(7, 6) >>> +#define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK) >>> +#define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK) >>> + >>> +#define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ >>> + { \ >>> + .type = _type, \ >>> + .indexed = 1, \ >>> + .channel = _channel, \ >>> + .address = _reg, \ >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ >>> + BIT(IIO_CHAN_INFO_SCALE), \ >>> + .datasheet_name = _name, \ >>> + } >>> + >>> +#define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \ >>> + { \ >>> + .type = _type, \ >>> + .indexed = 1, \ >>> + .channel = _channel, \ >>> + .address = _reg, \ >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ >>> + BIT(IIO_CHAN_INFO_SCALE) |\ >>> + BIT(IIO_CHAN_INFO_OFFSET),\ >>> + .datasheet_name = _name, \ >>> + } >>> + >>> +struct axp_data; >>> + >>> +struct axp20x_adc_iio { >>> + struct regmap *regmap; >>> + struct axp_data *data; >>> +}; >>> + >>> +enum axp20x_adc_channel_v { >>> + AXP20X_ACIN_V = 0, >>> + AXP20X_VBUS_V, >>> + AXP20X_TS_IN, >>> + AXP20X_GPIO0_V, >>> + AXP20X_GPIO1_V, >>> + AXP20X_IPSOUT_V, >>> + AXP20X_BATT_V, >>> +}; >>> + >>> +enum axp20x_adc_channel_i { >>> + AXP20X_ACIN_I = 0, >>> + AXP20X_VBUS_I, >>> + AXP20X_BATT_CHRG_I, >>> + AXP20X_BATT_DISCHRG_I, >>> +}; >>> + >>> +enum axp22x_adc_channel_v { >>> + AXP22X_TS_IN = 0, >>> + AXP22X_BATT_V, >>> +}; >>> + >>> +enum axp22x_adc_channel_i { >>> + AXP22X_BATT_CHRG_I = 1, >>> + AXP22X_BATT_DISCHRG_I, >>> +}; >>> + >>> +static struct iio_map axp20x_maps[] = { >>> + { >>> + .consumer_dev_name = "axp20x-usb-power-supply", >>> + .consumer_channel = "vbus_v", >>> + .adc_channel_label = "vbus_v", >>> + }, { >>> + .consumer_dev_name = "axp20x-usb-power-supply", >>> + .consumer_channel = "vbus_i", >>> + .adc_channel_label = "vbus_i", >>> + }, { >>> + .consumer_dev_name = "axp20x-ac-power-supply", >>> + .consumer_channel = "acin_v", >>> + .adc_channel_label = "acin_v", >>> + }, { >>> + .consumer_dev_name = "axp20x-ac-power-supply", >>> + .consumer_channel = "acin_i", >>> + .adc_channel_label = "acin_i", >>> + }, { >>> + .consumer_dev_name = "axp20x-battery-power-supply", >>> + .consumer_channel = "batt_v", >>> + .adc_channel_label = "batt_v", >>> + }, { >>> + .consumer_dev_name = "axp20x-battery-power-supply", >>> + .consumer_channel = "batt_chrg_i", >>> + .adc_channel_label = "batt_chrg_i", >>> + }, { >>> + .consumer_dev_name = "axp20x-battery-power-supply", >>> + .consumer_channel = "batt_dischrg_i", >>> + .adc_channel_label = "batt_dischrg_i", >>> + }, { /* sentinel */ } >>> +}; >>> + >>> +static struct iio_map axp22x_maps[] = { >>> + { >>> + .consumer_dev_name = "axp20x-battery-power-supply", >>> + .consumer_channel = "batt_v", >>> + .adc_channel_label = "batt_v", >>> + }, { >>> + .consumer_dev_name = "axp20x-battery-power-supply", >>> + .consumer_channel = "batt_chrg_i", >>> + .adc_channel_label = "batt_chrg_i", >>> + }, { >>> + .consumer_dev_name = "axp20x-battery-power-supply", >>> + .consumer_channel = "batt_dischrg_i", >>> + .adc_channel_label = "batt_dischrg_i", >>> + }, { /* sentinel */ } >>> +}; >>> + >>> +/* >>> + * Channels are mapped by physical system. Their channels share the same index. >>> + * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw. >>> + * The only exception is for the battery. batt_v will be in_voltage6_raw and >>> + * charge current in_current6_raw and discharge current will be in_current7_raw. >>> + */ >>> +static const struct iio_chan_spec axp20x_adc_channels[] = { >>> + AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE, >>> + AXP20X_ACIN_V_ADC_H), >>> + AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT, >>> + AXP20X_ACIN_I_ADC_H), >>> + AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE, >>> + AXP20X_VBUS_V_ADC_H), >>> + AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT, >>> + AXP20X_VBUS_I_ADC_H), >>> + { >>> + .type = IIO_TEMP, >>> + .address = AXP20X_TEMP_ADC_H, >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | >>> + BIT(IIO_CHAN_INFO_SCALE) | >>> + BIT(IIO_CHAN_INFO_OFFSET), >>> + .datasheet_name = "pmic_temp", >>> + }, >>> + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE, >>> + AXP20X_GPIO0_V_ADC_H), >>> + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE, >>> + AXP20X_GPIO1_V_ADC_H), >>> + AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE, >>> + AXP20X_IPSOUT_V_HIGH_H), >>> + AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE, >>> + AXP20X_BATT_V_H), >>> + AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, >>> + AXP20X_BATT_CHRG_I_H), >>> + AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, >>> + AXP20X_BATT_DISCHRG_I_H), >>> +}; >>> + >>> +static const struct iio_chan_spec axp22x_adc_channels[] = { >>> + { >>> + .type = IIO_TEMP, >>> + .address = AXP22X_PMIC_TEMP_H, >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | >>> + BIT(IIO_CHAN_INFO_SCALE) | >>> + BIT(IIO_CHAN_INFO_OFFSET), >>> + .datasheet_name = "pmic_temp", >>> + }, >>> + AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE, >>> + AXP20X_BATT_V_H), >>> + AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, >>> + AXP20X_BATT_CHRG_I_H), >>> + AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, >>> + AXP20X_BATT_DISCHRG_I_H), >>> +}; >>> + >>> +static int axp20x_adc_raw(struct iio_dev *indio_dev, >>> + struct iio_chan_spec const *chan, int *val) >>> +{ >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); >>> + int size = 12; >>> + >>> + /* >>> + * N.B.: Unlike the Chinese datasheets tell, the charging current is >>> + * stored on 12 bits, not 13 bits. Only discharging current is on 13 >>> + * bits. >>> + */ >>> + if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I) >>> + size = 13; >>> + else >>> + size = 12; >>> + >>> + *val = axp20x_read_variable_width(info->regmap, chan->address, size); >>> + if (*val < 0) >>> + return *val; >>> + >>> + return IIO_VAL_INT; >>> +} >>> + >>> +static int axp22x_adc_raw(struct iio_dev *indio_dev, >>> + struct iio_chan_spec const *chan, int *val) >>> +{ >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); >>> + int size; >>> + >>> + /* >>> + * N.B.: Unlike the Chinese datasheets tell, the charging current is >>> + * stored on 12 bits, not 13 bits. Only discharging current is on 13 >>> + * bits. >>> + */ >>> + if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I) >>> + size = 13; >>> + else >>> + size = 12; >>> + >>> + *val = axp20x_read_variable_width(info->regmap, chan->address, size); >>> + if (*val < 0) >>> + return *val; >>> + >>> + return IIO_VAL_INT; >>> +} >>> + >>> +static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) >>> +{ >>> + switch (channel) { >>> + case AXP20X_ACIN_V: >>> + case AXP20X_VBUS_V: >>> + *val = 1; >>> + *val2 = 700000; >>> + return IIO_VAL_INT_PLUS_MICRO; >>> + >>> + case AXP20X_GPIO0_V: >>> + case AXP20X_GPIO1_V: >>> + *val = 0; >>> + *val2 = 500000; >>> + return IIO_VAL_INT_PLUS_MICRO; >>> + >>> + case AXP20X_BATT_V: >>> + *val = 1; >>> + *val2 = 100000; >>> + return IIO_VAL_INT_PLUS_MICRO; >>> + >>> + case AXP20X_IPSOUT_V: >>> + *val = 1; >>> + *val2 = 400000; >>> + return IIO_VAL_INT_PLUS_MICRO; >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> +} >>> + >>> +static int axp20x_adc_scale_current(int channel, int *val, int *val2) >>> +{ >>> + switch (channel) { >>> + case AXP20X_ACIN_I: >>> + *val = 0; >>> + *val2 = 625000; >>> + return IIO_VAL_INT_PLUS_MICRO; >>> + >>> + case AXP20X_VBUS_I: >>> + *val = 0; >>> + *val2 = 375000; >>> + return IIO_VAL_INT_PLUS_MICRO; >>> + >>> + case AXP20X_BATT_DISCHRG_I: >>> + case AXP20X_BATT_CHRG_I: >>> + *val = 0; >>> + *val2 = 500000; >>> + return IIO_VAL_INT_PLUS_MICRO; >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> +} >>> + >>> +static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val, >>> + int *val2) >>> +{ >>> + switch (chan->type) { >>> + case IIO_VOLTAGE: >>> + return axp20x_adc_scale_voltage(chan->channel, val, val2); >>> + >>> + case IIO_CURRENT: >>> + return axp20x_adc_scale_current(chan->channel, val, val2); >>> + >>> + case IIO_TEMP: >>> + *val = 100; >>> + return IIO_VAL_INT; >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> +} >>> + >>> +static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, >>> + int *val2) >>> +{ >>> + switch (chan->type) { >>> + case IIO_VOLTAGE: >>> + if (chan->channel != AXP22X_BATT_V) >>> + return -EINVAL; >>> + >>> + *val = 1; >>> + *val2 = 100000; >>> + return IIO_VAL_INT_PLUS_MICRO; >>> + >>> + case IIO_CURRENT: >>> + *val = 0; >>> + *val2 = 500000; >>> + return IIO_VAL_INT_PLUS_MICRO; >>> + >>> + case IIO_TEMP: >>> + *val = 100; >>> + return IIO_VAL_INT; >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> +} >>> + >>> +static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel, >>> + int *val) >>> +{ >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); >>> + int ret; >>> + >>> + ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val); >>> + if (ret < 0) >>> + return ret; >>> + >>> + switch (channel) { >>> + case AXP20X_GPIO0_V: >>> + *val &= AXP20X_GPIO10_IN_RANGE_GPIO0; >>> + break; >>> + >>> + case AXP20X_GPIO1_V: >>> + *val &= AXP20X_GPIO10_IN_RANGE_GPIO1; >>> + break; >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> + >>> + *val = !!(*val) * 700000; >>> + >>> + return IIO_VAL_INT; >>> +} >>> + >>> +static int axp20x_adc_offset(struct iio_dev *indio_dev, >>> + struct iio_chan_spec const *chan, int *val) >>> +{ >>> + switch (chan->type) { >>> + case IIO_VOLTAGE: >>> + return axp20x_adc_offset_voltage(indio_dev, chan->channel, val); >>> + >>> + case IIO_TEMP: >>> + *val = -1447; >>> + return IIO_VAL_INT; >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> +} >>> + >>> +static int axp20x_read_raw(struct iio_dev *indio_dev, >>> + struct iio_chan_spec const *chan, int *val, >>> + int *val2, long mask) >>> +{ >>> + switch (mask) { >>> + case IIO_CHAN_INFO_OFFSET: >>> + return axp20x_adc_offset(indio_dev, chan, val); >>> + >>> + case IIO_CHAN_INFO_SCALE: >>> + return axp20x_adc_scale(chan, val, val2); >>> + >>> + case IIO_CHAN_INFO_RAW: >>> + return axp20x_adc_raw(indio_dev, chan, val); >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> +} >>> + >>> +static int axp22x_read_raw(struct iio_dev *indio_dev, >>> + struct iio_chan_spec const *chan, int *val, >>> + int *val2, long mask) >>> +{ >>> + switch (mask) { >>> + case IIO_CHAN_INFO_OFFSET: >>> + *val = -2677; >>> + return IIO_VAL_INT; >>> + >>> + case IIO_CHAN_INFO_SCALE: >>> + return axp22x_adc_scale(chan, val, val2); >>> + >>> + case IIO_CHAN_INFO_RAW: >>> + return axp22x_adc_raw(indio_dev, chan, val); >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> +} >>> + >>> +static int axp20x_write_raw(struct iio_dev *indio_dev, >>> + struct iio_chan_spec const *chan, int val, int val2, >>> + long mask) >>> +{ >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); >>> + unsigned int reg, regval; >>> + >>> + /* >>> + * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets >>> + * for (independently) GPIO0 and GPIO1 when in ADC mode. >>> + */ >>> + if (mask != IIO_CHAN_INFO_OFFSET) >>> + return -EINVAL; >>> + >>> + if (val != 0 && val != 700000) >>> + return -EINVAL; >>> + >>> + switch (chan->channel) { >>> + case AXP20X_GPIO0_V: >>> + reg = AXP20X_GPIO10_IN_RANGE_GPIO0; >>> + regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val); >>> + break; >>> + >>> + case AXP20X_GPIO1_V: >>> + reg = AXP20X_GPIO10_IN_RANGE_GPIO1; >>> + regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val); >>> + break; >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> + >>> + return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg, >>> + regval); >>> +} >>> + >>> +static const struct iio_info axp20x_adc_iio_info = { >>> + .read_raw = axp20x_read_raw, >>> + .write_raw = axp20x_write_raw, >>> + .driver_module = THIS_MODULE, >>> +}; >>> + >>> +static const struct iio_info axp22x_adc_iio_info = { >>> + .read_raw = axp22x_read_raw, >>> + .driver_module = THIS_MODULE, >>> +}; >>> + >>> +static int axp20x_adc_rate(int rate) >>> +{ >>> + return AXP20X_ADC_RATE_HZ(rate); >>> +} >>> + >>> +static int axp22x_adc_rate(int rate) >>> +{ >>> + return AXP22X_ADC_RATE_HZ(rate); >>> +} >>> + >>> +struct axp_data { >>> + const struct iio_info *iio_info; >>> + int num_channels; >>> + struct iio_chan_spec const *channels; >>> + unsigned long adc_en1_mask; >>> + int (*adc_rate)(int rate); >>> + bool adc_en2; >>> + struct iio_map *maps; >>> +}; >>> + >>> +static const struct axp_data axp20x_data = { >>> + .iio_info = &axp20x_adc_iio_info, >>> + .num_channels = ARRAY_SIZE(axp20x_adc_channels), >>> + .channels = axp20x_adc_channels, >>> + .adc_en1_mask = AXP20X_ADC_EN1_MASK, >>> + .adc_rate = axp20x_adc_rate, >>> + .adc_en2 = true, >>> + .maps = axp20x_maps, >>> +}; >>> + >>> +static const struct axp_data axp22x_data = { >>> + .iio_info = &axp22x_adc_iio_info, >>> + .num_channels = ARRAY_SIZE(axp22x_adc_channels), >>> + .channels = axp22x_adc_channels, >>> + .adc_en1_mask = AXP22X_ADC_EN1_MASK, >>> + .adc_rate = axp22x_adc_rate, >>> + .adc_en2 = false, >>> + .maps = axp22x_maps, >>> +}; >>> + >>> +static const struct platform_device_id axp20x_adc_id_match[] = { >>> + { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, }, >>> + { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, }, >>> + { /* sentinel */ }, >>> +}; >>> +MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); >>> + >>> +static int axp20x_probe(struct platform_device *pdev) >>> +{ >>> + struct axp20x_adc_iio *info; >>> + struct iio_dev *indio_dev; >>> + struct axp20x_dev *axp20x_dev; >>> + int ret; >>> + >>> + axp20x_dev = dev_get_drvdata(pdev->dev.parent); >>> + >>> + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); >>> + if (!indio_dev) >>> + return -ENOMEM; >>> + >>> + info = iio_priv(indio_dev); >>> + platform_set_drvdata(pdev, indio_dev); >>> + >>> + info->regmap = axp20x_dev->regmap; >>> + indio_dev->dev.parent = &pdev->dev; >>> + indio_dev->dev.of_node = pdev->dev.of_node; >>> + indio_dev->modes = INDIO_DIRECT_MODE; >>> + >>> + info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data; >>> + >>> + indio_dev->name = platform_get_device_id(pdev)->name; >>> + indio_dev->info = info->data->iio_info; >>> + indio_dev->num_channels = info->data->num_channels; >>> + indio_dev->channels = info->data->channels; >>> + >>> + /* Enable the ADCs on IP */ >>> + regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask); >>> + >>> + if (info->data->adc_en2) >>> + /* Enable GPIO0/1 and internal temperature ADCs */ >>> + regmap_update_bits(info->regmap, AXP20X_ADC_EN2, >>> + AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK); >>> + >>> + /* Configure ADCs rate */ >>> + regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK, >>> + info->data->adc_rate(100)); >>> + >>> + ret = iio_map_array_register(indio_dev, info->data->maps); >>> + if (ret < 0) { >>> + dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret); >>> + goto fail_map; >>> + } >>> + >>> + ret = iio_device_register(indio_dev); >>> + if (ret < 0) { >>> + dev_err(&pdev->dev, "could not register the device\n"); >>> + goto fail_register; >>> + } >>> + >>> + return 0; >>> + >>> +fail_register: >>> + iio_map_array_unregister(indio_dev); >>> + >>> +fail_map: >>> + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); >>> + >>> + if (info->data->adc_en2) >>> + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); >>> + >>> + return ret; >>> +} >>> + >>> +static int axp20x_remove(struct platform_device *pdev) >>> +{ >>> + struct iio_dev *indio_dev = platform_get_drvdata(pdev); >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); >>> + >>> + iio_device_unregister(indio_dev); >>> + iio_map_array_unregister(indio_dev); >>> + >>> + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); >>> + >>> + if (info->data->adc_en2) >>> + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); >>> + >>> + return 0; >>> +} >>> + >>> +static struct platform_driver axp20x_adc_driver = { >>> + .driver = { >>> + .name = "axp20x-adc", >>> + }, >>> + .id_table = axp20x_adc_id_match, >>> + .probe = axp20x_probe, >>> + .remove = axp20x_remove, >>> +}; >>> + >>> +module_platform_driver(axp20x_adc_driver); >>> + >>> +MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs"); >>> +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); >>> +MODULE_LICENSE("GPL"); >>> >> >
On Tue, 11 Apr 2017, Quentin Schulz wrote: > On 10/04/2017 16:54, Lee Jones wrote: > > On Mon, 10 Apr 2017, Quentin Schulz wrote: > > > >> Hi Lee, > >> > >> Just to make sure you didn't miss that patch (can't find it in > >> for-mfd-next and for-mfd-next-next). > > > > It has not been missed, but is yet to be reviewed. > > > > Hum.. What do you mean exactly? The maintainer of the AXP PMICs has > given its Acked-by and the maintainer of the IIO subsystem has given its > Reviewed-by. Is there something I'm missing (in your workflow maybe)? I mean I haven't reviewed and picked it up yet. I will get around to it shortly. > >> On 04/04/2017 08:34, Quentin Schulz wrote: > >>> The X-Powers AXP20X and AXP22X PMICs have multiple ADCs. They expose the > >>> battery voltage, battery charge and discharge currents, AC-in and VBUS > >>> voltages and currents, 2 GPIOs muxable in ADC mode and PMIC temperature. > >>> > >>> This adds support for most of AXP20X and AXP22X ADCs. > >>> > >>> Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> > >>> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> > >>> Acked-by: Chen-Yu Tsai <wens@csie.org> > >>> Reviewed-by: Jonathan Cameron <jic23@kernel.org> > >>> --- > >>> > >>> Lee, could you merge this through the mfd tree please? > >>> => https://lkml.org/lkml/2017/3/22/47 > >>> > >>> v4: > >>> - added missing space at the beginning of a comment, > >>> - tidied axp20x_adc_offset_voltage and axp20x_write_raw to use switch case > >>> instead of if conditions, > >>> - added MODULE_DEVICE_TABLE for axp20x_adc_id_match for module autoloading, > >>> - merged two lines in axp20x_remove, > >>> > >>> v3: > >>> - moved from switch to if condition in axp20x_adc_raw and > >>> axp22x_adc_raw, > >>> - removed DT support as DT node has been dropped, > >>> - use of platform_device_id > >>> - correctly defined the name of the iio device (name used to probe the > >>> driver), > >>> - added goto for errors in probe, > >>> - added iio_map_array_unregister to the remove function, > >>> > >>> v2: > >>> - removed unused defines, > >>> - changed BIT(x) to 1 << x when describing bits purpose for which 2 << > >>> x or 3 << x exists, to be consistent, > >>> - changed ADC rate defines to macro formulas, > >>> - reordered IIO channels, now different measures (current/voltage) of > >>> the same part of the PMIC (e.g. battery), have the same IIO channel in > >>> their respective IIO type. When a part of the PMIC have only one > >>> measure, a number is jumped, > >>> - left IIO channel mapping in DT to use iio_map structure, > >>> - removed indexing of ADC internal temperature, > >>> - removed unused iio_dev structure in axp20x_adc_iio, > >>> - added a structure for data specific to AXP20X or AXP22X PMICs instead > >>> of using an ID and an if condition when needing to separate the > >>> behaviour of both, > >>> - added a comment on batt_chrg_i really being on 12bits rather than > >>> what the Chinese datasheets say (13 bits), > >>> - corrected the offset for AXP22X PMIC temperature, > >>> - set the ADC rate to a value (100Hz) shared by the AXP20X and AXP22X, > >>> - created macro formulas to compute the ADC rate for each, > >>> - added a condition on presence of ADC_EN2 reg before setting/resetting > >>> it, > >>> - switched from devm_iio_device_unregister to the non-devm function > >>> because of the need for a remove function, > >>> - removed some dead code, > >>> > >>> drivers/iio/adc/Kconfig | 10 + > >>> drivers/iio/adc/Makefile | 1 + > >>> drivers/iio/adc/axp20x_adc.c | 617 +++++++++++++++++++++++++++++++++++++++++++ > >>> 3 files changed, 628 insertions(+) > >>> create mode 100644 drivers/iio/adc/axp20x_adc.c > >>> > >>> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > >>> index d777a97..d15e1bd 100644 > >>> --- a/drivers/iio/adc/Kconfig > >>> +++ b/drivers/iio/adc/Kconfig > >>> @@ -154,6 +154,16 @@ config AT91_SAMA5D2_ADC > >>> To compile this driver as a module, choose M here: the module will be > >>> called at91-sama5d2_adc. > >>> > >>> +config AXP20X_ADC > >>> + tristate "X-Powers AXP20X and AXP22X ADC driver" > >>> + depends on MFD_AXP20X > >>> + help > >>> + Say yes here to have support for X-Powers power management IC (PMIC) > >>> + AXP20X and AXP22X ADC devices. > >>> + > >>> + To compile this driver as a module, choose M here: the module will be > >>> + called axp20x_adc. > >>> + > >>> config AXP288_ADC > >>> tristate "X-Powers AXP288 ADC driver" > >>> depends on MFD_AXP20X > >>> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > >>> index b11bb57..17899b5 100644 > >>> --- a/drivers/iio/adc/Makefile > >>> +++ b/drivers/iio/adc/Makefile > >>> @@ -16,6 +16,7 @@ obj-$(CONFIG_AD7887) += ad7887.o > >>> obj-$(CONFIG_AD799X) += ad799x.o > >>> obj-$(CONFIG_AT91_ADC) += at91_adc.o > >>> obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o > >>> +obj-$(CONFIG_AXP20X_ADC) += axp20x_adc.o > >>> obj-$(CONFIG_AXP288_ADC) += axp288_adc.o > >>> obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o > >>> obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o > >>> diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c > >>> new file mode 100644 > >>> index 0000000..11e1771 > >>> --- /dev/null > >>> +++ b/drivers/iio/adc/axp20x_adc.c > >>> @@ -0,0 +1,617 @@ > >>> +/* ADC driver for AXP20X and AXP22X PMICs > >>> + * > >>> + * Copyright (c) 2016 Free Electrons NextThing Co. > >>> + * Quentin Schulz <quentin.schulz@free-electrons.com> > >>> + * > >>> + * This program is free software; you can redistribute it and/or modify it under > >>> + * the terms of the GNU General Public License version 2 as published by the > >>> + * Free Software Foundation. > >>> + */ > >>> + > >>> +#include <linux/completion.h> > >>> +#include <linux/interrupt.h> > >>> +#include <linux/io.h> > >>> +#include <linux/module.h> > >>> +#include <linux/of.h> > >>> +#include <linux/of_device.h> > >>> +#include <linux/platform_device.h> > >>> +#include <linux/pm_runtime.h> > >>> +#include <linux/regmap.h> > >>> +#include <linux/thermal.h> > >>> + > >>> +#include <linux/iio/iio.h> > >>> +#include <linux/iio/driver.h> > >>> +#include <linux/iio/machine.h> > >>> +#include <linux/mfd/axp20x.h> > >>> + > >>> +#define AXP20X_ADC_EN1_MASK GENMASK(7, 0) > >>> + > >>> +#define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7)) > >>> +#define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0)) > >>> + > >>> +#define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0) > >>> +#define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1) > >>> +#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0)) > >>> +#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) > >>> + > >>> +#define AXP20X_ADC_RATE_MASK GENMASK(7, 6) > >>> +#define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK) > >>> +#define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK) > >>> + > >>> +#define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ > >>> + { \ > >>> + .type = _type, \ > >>> + .indexed = 1, \ > >>> + .channel = _channel, \ > >>> + .address = _reg, \ > >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > >>> + BIT(IIO_CHAN_INFO_SCALE), \ > >>> + .datasheet_name = _name, \ > >>> + } > >>> + > >>> +#define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \ > >>> + { \ > >>> + .type = _type, \ > >>> + .indexed = 1, \ > >>> + .channel = _channel, \ > >>> + .address = _reg, \ > >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > >>> + BIT(IIO_CHAN_INFO_SCALE) |\ > >>> + BIT(IIO_CHAN_INFO_OFFSET),\ > >>> + .datasheet_name = _name, \ > >>> + } > >>> + > >>> +struct axp_data; > >>> + > >>> +struct axp20x_adc_iio { > >>> + struct regmap *regmap; > >>> + struct axp_data *data; > >>> +}; > >>> + > >>> +enum axp20x_adc_channel_v { > >>> + AXP20X_ACIN_V = 0, > >>> + AXP20X_VBUS_V, > >>> + AXP20X_TS_IN, > >>> + AXP20X_GPIO0_V, > >>> + AXP20X_GPIO1_V, > >>> + AXP20X_IPSOUT_V, > >>> + AXP20X_BATT_V, > >>> +}; > >>> + > >>> +enum axp20x_adc_channel_i { > >>> + AXP20X_ACIN_I = 0, > >>> + AXP20X_VBUS_I, > >>> + AXP20X_BATT_CHRG_I, > >>> + AXP20X_BATT_DISCHRG_I, > >>> +}; > >>> + > >>> +enum axp22x_adc_channel_v { > >>> + AXP22X_TS_IN = 0, > >>> + AXP22X_BATT_V, > >>> +}; > >>> + > >>> +enum axp22x_adc_channel_i { > >>> + AXP22X_BATT_CHRG_I = 1, > >>> + AXP22X_BATT_DISCHRG_I, > >>> +}; > >>> + > >>> +static struct iio_map axp20x_maps[] = { > >>> + { > >>> + .consumer_dev_name = "axp20x-usb-power-supply", > >>> + .consumer_channel = "vbus_v", > >>> + .adc_channel_label = "vbus_v", > >>> + }, { > >>> + .consumer_dev_name = "axp20x-usb-power-supply", > >>> + .consumer_channel = "vbus_i", > >>> + .adc_channel_label = "vbus_i", > >>> + }, { > >>> + .consumer_dev_name = "axp20x-ac-power-supply", > >>> + .consumer_channel = "acin_v", > >>> + .adc_channel_label = "acin_v", > >>> + }, { > >>> + .consumer_dev_name = "axp20x-ac-power-supply", > >>> + .consumer_channel = "acin_i", > >>> + .adc_channel_label = "acin_i", > >>> + }, { > >>> + .consumer_dev_name = "axp20x-battery-power-supply", > >>> + .consumer_channel = "batt_v", > >>> + .adc_channel_label = "batt_v", > >>> + }, { > >>> + .consumer_dev_name = "axp20x-battery-power-supply", > >>> + .consumer_channel = "batt_chrg_i", > >>> + .adc_channel_label = "batt_chrg_i", > >>> + }, { > >>> + .consumer_dev_name = "axp20x-battery-power-supply", > >>> + .consumer_channel = "batt_dischrg_i", > >>> + .adc_channel_label = "batt_dischrg_i", > >>> + }, { /* sentinel */ } > >>> +}; > >>> + > >>> +static struct iio_map axp22x_maps[] = { > >>> + { > >>> + .consumer_dev_name = "axp20x-battery-power-supply", > >>> + .consumer_channel = "batt_v", > >>> + .adc_channel_label = "batt_v", > >>> + }, { > >>> + .consumer_dev_name = "axp20x-battery-power-supply", > >>> + .consumer_channel = "batt_chrg_i", > >>> + .adc_channel_label = "batt_chrg_i", > >>> + }, { > >>> + .consumer_dev_name = "axp20x-battery-power-supply", > >>> + .consumer_channel = "batt_dischrg_i", > >>> + .adc_channel_label = "batt_dischrg_i", > >>> + }, { /* sentinel */ } > >>> +}; > >>> + > >>> +/* > >>> + * Channels are mapped by physical system. Their channels share the same index. > >>> + * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw. > >>> + * The only exception is for the battery. batt_v will be in_voltage6_raw and > >>> + * charge current in_current6_raw and discharge current will be in_current7_raw. > >>> + */ > >>> +static const struct iio_chan_spec axp20x_adc_channels[] = { > >>> + AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE, > >>> + AXP20X_ACIN_V_ADC_H), > >>> + AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT, > >>> + AXP20X_ACIN_I_ADC_H), > >>> + AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE, > >>> + AXP20X_VBUS_V_ADC_H), > >>> + AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT, > >>> + AXP20X_VBUS_I_ADC_H), > >>> + { > >>> + .type = IIO_TEMP, > >>> + .address = AXP20X_TEMP_ADC_H, > >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > >>> + BIT(IIO_CHAN_INFO_SCALE) | > >>> + BIT(IIO_CHAN_INFO_OFFSET), > >>> + .datasheet_name = "pmic_temp", > >>> + }, > >>> + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE, > >>> + AXP20X_GPIO0_V_ADC_H), > >>> + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE, > >>> + AXP20X_GPIO1_V_ADC_H), > >>> + AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE, > >>> + AXP20X_IPSOUT_V_HIGH_H), > >>> + AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE, > >>> + AXP20X_BATT_V_H), > >>> + AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > >>> + AXP20X_BATT_CHRG_I_H), > >>> + AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > >>> + AXP20X_BATT_DISCHRG_I_H), > >>> +}; > >>> + > >>> +static const struct iio_chan_spec axp22x_adc_channels[] = { > >>> + { > >>> + .type = IIO_TEMP, > >>> + .address = AXP22X_PMIC_TEMP_H, > >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > >>> + BIT(IIO_CHAN_INFO_SCALE) | > >>> + BIT(IIO_CHAN_INFO_OFFSET), > >>> + .datasheet_name = "pmic_temp", > >>> + }, > >>> + AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE, > >>> + AXP20X_BATT_V_H), > >>> + AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > >>> + AXP20X_BATT_CHRG_I_H), > >>> + AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > >>> + AXP20X_BATT_DISCHRG_I_H), > >>> +}; > >>> + > >>> +static int axp20x_adc_raw(struct iio_dev *indio_dev, > >>> + struct iio_chan_spec const *chan, int *val) > >>> +{ > >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); > >>> + int size = 12; > >>> + > >>> + /* > >>> + * N.B.: Unlike the Chinese datasheets tell, the charging current is > >>> + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > >>> + * bits. > >>> + */ > >>> + if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I) > >>> + size = 13; > >>> + else > >>> + size = 12; > >>> + > >>> + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > >>> + if (*val < 0) > >>> + return *val; > >>> + > >>> + return IIO_VAL_INT; > >>> +} > >>> + > >>> +static int axp22x_adc_raw(struct iio_dev *indio_dev, > >>> + struct iio_chan_spec const *chan, int *val) > >>> +{ > >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); > >>> + int size; > >>> + > >>> + /* > >>> + * N.B.: Unlike the Chinese datasheets tell, the charging current is > >>> + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > >>> + * bits. > >>> + */ > >>> + if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I) > >>> + size = 13; > >>> + else > >>> + size = 12; > >>> + > >>> + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > >>> + if (*val < 0) > >>> + return *val; > >>> + > >>> + return IIO_VAL_INT; > >>> +} > >>> + > >>> +static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) > >>> +{ > >>> + switch (channel) { > >>> + case AXP20X_ACIN_V: > >>> + case AXP20X_VBUS_V: > >>> + *val = 1; > >>> + *val2 = 700000; > >>> + return IIO_VAL_INT_PLUS_MICRO; > >>> + > >>> + case AXP20X_GPIO0_V: > >>> + case AXP20X_GPIO1_V: > >>> + *val = 0; > >>> + *val2 = 500000; > >>> + return IIO_VAL_INT_PLUS_MICRO; > >>> + > >>> + case AXP20X_BATT_V: > >>> + *val = 1; > >>> + *val2 = 100000; > >>> + return IIO_VAL_INT_PLUS_MICRO; > >>> + > >>> + case AXP20X_IPSOUT_V: > >>> + *val = 1; > >>> + *val2 = 400000; > >>> + return IIO_VAL_INT_PLUS_MICRO; > >>> + > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> +} > >>> + > >>> +static int axp20x_adc_scale_current(int channel, int *val, int *val2) > >>> +{ > >>> + switch (channel) { > >>> + case AXP20X_ACIN_I: > >>> + *val = 0; > >>> + *val2 = 625000; > >>> + return IIO_VAL_INT_PLUS_MICRO; > >>> + > >>> + case AXP20X_VBUS_I: > >>> + *val = 0; > >>> + *val2 = 375000; > >>> + return IIO_VAL_INT_PLUS_MICRO; > >>> + > >>> + case AXP20X_BATT_DISCHRG_I: > >>> + case AXP20X_BATT_CHRG_I: > >>> + *val = 0; > >>> + *val2 = 500000; > >>> + return IIO_VAL_INT_PLUS_MICRO; > >>> + > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> +} > >>> + > >>> +static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val, > >>> + int *val2) > >>> +{ > >>> + switch (chan->type) { > >>> + case IIO_VOLTAGE: > >>> + return axp20x_adc_scale_voltage(chan->channel, val, val2); > >>> + > >>> + case IIO_CURRENT: > >>> + return axp20x_adc_scale_current(chan->channel, val, val2); > >>> + > >>> + case IIO_TEMP: > >>> + *val = 100; > >>> + return IIO_VAL_INT; > >>> + > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> +} > >>> + > >>> +static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, > >>> + int *val2) > >>> +{ > >>> + switch (chan->type) { > >>> + case IIO_VOLTAGE: > >>> + if (chan->channel != AXP22X_BATT_V) > >>> + return -EINVAL; > >>> + > >>> + *val = 1; > >>> + *val2 = 100000; > >>> + return IIO_VAL_INT_PLUS_MICRO; > >>> + > >>> + case IIO_CURRENT: > >>> + *val = 0; > >>> + *val2 = 500000; > >>> + return IIO_VAL_INT_PLUS_MICRO; > >>> + > >>> + case IIO_TEMP: > >>> + *val = 100; > >>> + return IIO_VAL_INT; > >>> + > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> +} > >>> + > >>> +static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel, > >>> + int *val) > >>> +{ > >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); > >>> + int ret; > >>> + > >>> + ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val); > >>> + if (ret < 0) > >>> + return ret; > >>> + > >>> + switch (channel) { > >>> + case AXP20X_GPIO0_V: > >>> + *val &= AXP20X_GPIO10_IN_RANGE_GPIO0; > >>> + break; > >>> + > >>> + case AXP20X_GPIO1_V: > >>> + *val &= AXP20X_GPIO10_IN_RANGE_GPIO1; > >>> + break; > >>> + > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> + > >>> + *val = !!(*val) * 700000; > >>> + > >>> + return IIO_VAL_INT; > >>> +} > >>> + > >>> +static int axp20x_adc_offset(struct iio_dev *indio_dev, > >>> + struct iio_chan_spec const *chan, int *val) > >>> +{ > >>> + switch (chan->type) { > >>> + case IIO_VOLTAGE: > >>> + return axp20x_adc_offset_voltage(indio_dev, chan->channel, val); > >>> + > >>> + case IIO_TEMP: > >>> + *val = -1447; > >>> + return IIO_VAL_INT; > >>> + > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> +} > >>> + > >>> +static int axp20x_read_raw(struct iio_dev *indio_dev, > >>> + struct iio_chan_spec const *chan, int *val, > >>> + int *val2, long mask) > >>> +{ > >>> + switch (mask) { > >>> + case IIO_CHAN_INFO_OFFSET: > >>> + return axp20x_adc_offset(indio_dev, chan, val); > >>> + > >>> + case IIO_CHAN_INFO_SCALE: > >>> + return axp20x_adc_scale(chan, val, val2); > >>> + > >>> + case IIO_CHAN_INFO_RAW: > >>> + return axp20x_adc_raw(indio_dev, chan, val); > >>> + > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> +} > >>> + > >>> +static int axp22x_read_raw(struct iio_dev *indio_dev, > >>> + struct iio_chan_spec const *chan, int *val, > >>> + int *val2, long mask) > >>> +{ > >>> + switch (mask) { > >>> + case IIO_CHAN_INFO_OFFSET: > >>> + *val = -2677; > >>> + return IIO_VAL_INT; > >>> + > >>> + case IIO_CHAN_INFO_SCALE: > >>> + return axp22x_adc_scale(chan, val, val2); > >>> + > >>> + case IIO_CHAN_INFO_RAW: > >>> + return axp22x_adc_raw(indio_dev, chan, val); > >>> + > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> +} > >>> + > >>> +static int axp20x_write_raw(struct iio_dev *indio_dev, > >>> + struct iio_chan_spec const *chan, int val, int val2, > >>> + long mask) > >>> +{ > >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); > >>> + unsigned int reg, regval; > >>> + > >>> + /* > >>> + * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets > >>> + * for (independently) GPIO0 and GPIO1 when in ADC mode. > >>> + */ > >>> + if (mask != IIO_CHAN_INFO_OFFSET) > >>> + return -EINVAL; > >>> + > >>> + if (val != 0 && val != 700000) > >>> + return -EINVAL; > >>> + > >>> + switch (chan->channel) { > >>> + case AXP20X_GPIO0_V: > >>> + reg = AXP20X_GPIO10_IN_RANGE_GPIO0; > >>> + regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val); > >>> + break; > >>> + > >>> + case AXP20X_GPIO1_V: > >>> + reg = AXP20X_GPIO10_IN_RANGE_GPIO1; > >>> + regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val); > >>> + break; > >>> + > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> + > >>> + return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg, > >>> + regval); > >>> +} > >>> + > >>> +static const struct iio_info axp20x_adc_iio_info = { > >>> + .read_raw = axp20x_read_raw, > >>> + .write_raw = axp20x_write_raw, > >>> + .driver_module = THIS_MODULE, > >>> +}; > >>> + > >>> +static const struct iio_info axp22x_adc_iio_info = { > >>> + .read_raw = axp22x_read_raw, > >>> + .driver_module = THIS_MODULE, > >>> +}; > >>> + > >>> +static int axp20x_adc_rate(int rate) > >>> +{ > >>> + return AXP20X_ADC_RATE_HZ(rate); > >>> +} > >>> + > >>> +static int axp22x_adc_rate(int rate) > >>> +{ > >>> + return AXP22X_ADC_RATE_HZ(rate); > >>> +} > >>> + > >>> +struct axp_data { > >>> + const struct iio_info *iio_info; > >>> + int num_channels; > >>> + struct iio_chan_spec const *channels; > >>> + unsigned long adc_en1_mask; > >>> + int (*adc_rate)(int rate); > >>> + bool adc_en2; > >>> + struct iio_map *maps; > >>> +}; > >>> + > >>> +static const struct axp_data axp20x_data = { > >>> + .iio_info = &axp20x_adc_iio_info, > >>> + .num_channels = ARRAY_SIZE(axp20x_adc_channels), > >>> + .channels = axp20x_adc_channels, > >>> + .adc_en1_mask = AXP20X_ADC_EN1_MASK, > >>> + .adc_rate = axp20x_adc_rate, > >>> + .adc_en2 = true, > >>> + .maps = axp20x_maps, > >>> +}; > >>> + > >>> +static const struct axp_data axp22x_data = { > >>> + .iio_info = &axp22x_adc_iio_info, > >>> + .num_channels = ARRAY_SIZE(axp22x_adc_channels), > >>> + .channels = axp22x_adc_channels, > >>> + .adc_en1_mask = AXP22X_ADC_EN1_MASK, > >>> + .adc_rate = axp22x_adc_rate, > >>> + .adc_en2 = false, > >>> + .maps = axp22x_maps, > >>> +}; > >>> + > >>> +static const struct platform_device_id axp20x_adc_id_match[] = { > >>> + { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, }, > >>> + { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, }, > >>> + { /* sentinel */ }, > >>> +}; > >>> +MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); > >>> + > >>> +static int axp20x_probe(struct platform_device *pdev) > >>> +{ > >>> + struct axp20x_adc_iio *info; > >>> + struct iio_dev *indio_dev; > >>> + struct axp20x_dev *axp20x_dev; > >>> + int ret; > >>> + > >>> + axp20x_dev = dev_get_drvdata(pdev->dev.parent); > >>> + > >>> + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); > >>> + if (!indio_dev) > >>> + return -ENOMEM; > >>> + > >>> + info = iio_priv(indio_dev); > >>> + platform_set_drvdata(pdev, indio_dev); > >>> + > >>> + info->regmap = axp20x_dev->regmap; > >>> + indio_dev->dev.parent = &pdev->dev; > >>> + indio_dev->dev.of_node = pdev->dev.of_node; > >>> + indio_dev->modes = INDIO_DIRECT_MODE; > >>> + > >>> + info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data; > >>> + > >>> + indio_dev->name = platform_get_device_id(pdev)->name; > >>> + indio_dev->info = info->data->iio_info; > >>> + indio_dev->num_channels = info->data->num_channels; > >>> + indio_dev->channels = info->data->channels; > >>> + > >>> + /* Enable the ADCs on IP */ > >>> + regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask); > >>> + > >>> + if (info->data->adc_en2) > >>> + /* Enable GPIO0/1 and internal temperature ADCs */ > >>> + regmap_update_bits(info->regmap, AXP20X_ADC_EN2, > >>> + AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK); > >>> + > >>> + /* Configure ADCs rate */ > >>> + regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK, > >>> + info->data->adc_rate(100)); > >>> + > >>> + ret = iio_map_array_register(indio_dev, info->data->maps); > >>> + if (ret < 0) { > >>> + dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret); > >>> + goto fail_map; > >>> + } > >>> + > >>> + ret = iio_device_register(indio_dev); > >>> + if (ret < 0) { > >>> + dev_err(&pdev->dev, "could not register the device\n"); > >>> + goto fail_register; > >>> + } > >>> + > >>> + return 0; > >>> + > >>> +fail_register: > >>> + iio_map_array_unregister(indio_dev); > >>> + > >>> +fail_map: > >>> + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > >>> + > >>> + if (info->data->adc_en2) > >>> + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > >>> + > >>> + return ret; > >>> +} > >>> + > >>> +static int axp20x_remove(struct platform_device *pdev) > >>> +{ > >>> + struct iio_dev *indio_dev = platform_get_drvdata(pdev); > >>> + struct axp20x_adc_iio *info = iio_priv(indio_dev); > >>> + > >>> + iio_device_unregister(indio_dev); > >>> + iio_map_array_unregister(indio_dev); > >>> + > >>> + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > >>> + > >>> + if (info->data->adc_en2) > >>> + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static struct platform_driver axp20x_adc_driver = { > >>> + .driver = { > >>> + .name = "axp20x-adc", > >>> + }, > >>> + .id_table = axp20x_adc_id_match, > >>> + .probe = axp20x_probe, > >>> + .remove = axp20x_remove, > >>> +}; > >>> + > >>> +module_platform_driver(axp20x_adc_driver); > >>> + > >>> +MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs"); > >>> +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); > >>> +MODULE_LICENSE("GPL"); > >>> > >> > > >
On Tue, 04 Apr 2017, Quentin Schulz wrote: > The X-Powers AXP20X and AXP22X PMICs have multiple ADCs. They expose the > battery voltage, battery charge and discharge currents, AC-in and VBUS > voltages and currents, 2 GPIOs muxable in ADC mode and PMIC temperature. > > This adds support for most of AXP20X and AXP22X ADCs. > > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> > Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> > Acked-by: Chen-Yu Tsai <wens@csie.org> > Reviewed-by: Jonathan Cameron <jic23@kernel.org> > --- > > Lee, could you merge this through the mfd tree please? > => https://lkml.org/lkml/2017/3/22/47 Applied, thanks. > v4: > - added missing space at the beginning of a comment, > - tidied axp20x_adc_offset_voltage and axp20x_write_raw to use switch case > instead of if conditions, > - added MODULE_DEVICE_TABLE for axp20x_adc_id_match for module autoloading, > - merged two lines in axp20x_remove, > > v3: > - moved from switch to if condition in axp20x_adc_raw and > axp22x_adc_raw, > - removed DT support as DT node has been dropped, > - use of platform_device_id > - correctly defined the name of the iio device (name used to probe the > driver), > - added goto for errors in probe, > - added iio_map_array_unregister to the remove function, > > v2: > - removed unused defines, > - changed BIT(x) to 1 << x when describing bits purpose for which 2 << > x or 3 << x exists, to be consistent, > - changed ADC rate defines to macro formulas, > - reordered IIO channels, now different measures (current/voltage) of > the same part of the PMIC (e.g. battery), have the same IIO channel in > their respective IIO type. When a part of the PMIC have only one > measure, a number is jumped, > - left IIO channel mapping in DT to use iio_map structure, > - removed indexing of ADC internal temperature, > - removed unused iio_dev structure in axp20x_adc_iio, > - added a structure for data specific to AXP20X or AXP22X PMICs instead > of using an ID and an if condition when needing to separate the > behaviour of both, > - added a comment on batt_chrg_i really being on 12bits rather than > what the Chinese datasheets say (13 bits), > - corrected the offset for AXP22X PMIC temperature, > - set the ADC rate to a value (100Hz) shared by the AXP20X and AXP22X, > - created macro formulas to compute the ADC rate for each, > - added a condition on presence of ADC_EN2 reg before setting/resetting > it, > - switched from devm_iio_device_unregister to the non-devm function > because of the need for a remove function, > - removed some dead code, > > drivers/iio/adc/Kconfig | 10 + > drivers/iio/adc/Makefile | 1 + > drivers/iio/adc/axp20x_adc.c | 617 +++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 628 insertions(+) > create mode 100644 drivers/iio/adc/axp20x_adc.c > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > index d777a97..d15e1bd 100644 > --- a/drivers/iio/adc/Kconfig > +++ b/drivers/iio/adc/Kconfig > @@ -154,6 +154,16 @@ config AT91_SAMA5D2_ADC > To compile this driver as a module, choose M here: the module will be > called at91-sama5d2_adc. > > +config AXP20X_ADC > + tristate "X-Powers AXP20X and AXP22X ADC driver" > + depends on MFD_AXP20X > + help > + Say yes here to have support for X-Powers power management IC (PMIC) > + AXP20X and AXP22X ADC devices. > + > + To compile this driver as a module, choose M here: the module will be > + called axp20x_adc. > + > config AXP288_ADC > tristate "X-Powers AXP288 ADC driver" > depends on MFD_AXP20X > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > index b11bb57..17899b5 100644 > --- a/drivers/iio/adc/Makefile > +++ b/drivers/iio/adc/Makefile > @@ -16,6 +16,7 @@ obj-$(CONFIG_AD7887) += ad7887.o > obj-$(CONFIG_AD799X) += ad799x.o > obj-$(CONFIG_AT91_ADC) += at91_adc.o > obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o > +obj-$(CONFIG_AXP20X_ADC) += axp20x_adc.o > obj-$(CONFIG_AXP288_ADC) += axp288_adc.o > obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o > obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o > diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c > new file mode 100644 > index 0000000..11e1771 > --- /dev/null > +++ b/drivers/iio/adc/axp20x_adc.c > @@ -0,0 +1,617 @@ > +/* ADC driver for AXP20X and AXP22X PMICs > + * > + * Copyright (c) 2016 Free Electrons NextThing Co. > + * Quentin Schulz <quentin.schulz@free-electrons.com> > + * > + * This program is free software; you can redistribute it and/or modify it under > + * the terms of the GNU General Public License version 2 as published by the > + * Free Software Foundation. > + */ > + > +#include <linux/completion.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/regmap.h> > +#include <linux/thermal.h> > + > +#include <linux/iio/iio.h> > +#include <linux/iio/driver.h> > +#include <linux/iio/machine.h> > +#include <linux/mfd/axp20x.h> > + > +#define AXP20X_ADC_EN1_MASK GENMASK(7, 0) > + > +#define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7)) > +#define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0)) > + > +#define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0) > +#define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1) > +#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0)) > +#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) > + > +#define AXP20X_ADC_RATE_MASK GENMASK(7, 6) > +#define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK) > +#define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK) > + > +#define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ > + { \ > + .type = _type, \ > + .indexed = 1, \ > + .channel = _channel, \ > + .address = _reg, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > + BIT(IIO_CHAN_INFO_SCALE), \ > + .datasheet_name = _name, \ > + } > + > +#define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \ > + { \ > + .type = _type, \ > + .indexed = 1, \ > + .channel = _channel, \ > + .address = _reg, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > + BIT(IIO_CHAN_INFO_SCALE) |\ > + BIT(IIO_CHAN_INFO_OFFSET),\ > + .datasheet_name = _name, \ > + } > + > +struct axp_data; > + > +struct axp20x_adc_iio { > + struct regmap *regmap; > + struct axp_data *data; > +}; > + > +enum axp20x_adc_channel_v { > + AXP20X_ACIN_V = 0, > + AXP20X_VBUS_V, > + AXP20X_TS_IN, > + AXP20X_GPIO0_V, > + AXP20X_GPIO1_V, > + AXP20X_IPSOUT_V, > + AXP20X_BATT_V, > +}; > + > +enum axp20x_adc_channel_i { > + AXP20X_ACIN_I = 0, > + AXP20X_VBUS_I, > + AXP20X_BATT_CHRG_I, > + AXP20X_BATT_DISCHRG_I, > +}; > + > +enum axp22x_adc_channel_v { > + AXP22X_TS_IN = 0, > + AXP22X_BATT_V, > +}; > + > +enum axp22x_adc_channel_i { > + AXP22X_BATT_CHRG_I = 1, > + AXP22X_BATT_DISCHRG_I, > +}; > + > +static struct iio_map axp20x_maps[] = { > + { > + .consumer_dev_name = "axp20x-usb-power-supply", > + .consumer_channel = "vbus_v", > + .adc_channel_label = "vbus_v", > + }, { > + .consumer_dev_name = "axp20x-usb-power-supply", > + .consumer_channel = "vbus_i", > + .adc_channel_label = "vbus_i", > + }, { > + .consumer_dev_name = "axp20x-ac-power-supply", > + .consumer_channel = "acin_v", > + .adc_channel_label = "acin_v", > + }, { > + .consumer_dev_name = "axp20x-ac-power-supply", > + .consumer_channel = "acin_i", > + .adc_channel_label = "acin_i", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_v", > + .adc_channel_label = "batt_v", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_chrg_i", > + .adc_channel_label = "batt_chrg_i", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_dischrg_i", > + .adc_channel_label = "batt_dischrg_i", > + }, { /* sentinel */ } > +}; > + > +static struct iio_map axp22x_maps[] = { > + { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_v", > + .adc_channel_label = "batt_v", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_chrg_i", > + .adc_channel_label = "batt_chrg_i", > + }, { > + .consumer_dev_name = "axp20x-battery-power-supply", > + .consumer_channel = "batt_dischrg_i", > + .adc_channel_label = "batt_dischrg_i", > + }, { /* sentinel */ } > +}; > + > +/* > + * Channels are mapped by physical system. Their channels share the same index. > + * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw. > + * The only exception is for the battery. batt_v will be in_voltage6_raw and > + * charge current in_current6_raw and discharge current will be in_current7_raw. > + */ > +static const struct iio_chan_spec axp20x_adc_channels[] = { > + AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE, > + AXP20X_ACIN_V_ADC_H), > + AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT, > + AXP20X_ACIN_I_ADC_H), > + AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE, > + AXP20X_VBUS_V_ADC_H), > + AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT, > + AXP20X_VBUS_I_ADC_H), > + { > + .type = IIO_TEMP, > + .address = AXP20X_TEMP_ADC_H, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > + BIT(IIO_CHAN_INFO_SCALE) | > + BIT(IIO_CHAN_INFO_OFFSET), > + .datasheet_name = "pmic_temp", > + }, > + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE, > + AXP20X_GPIO0_V_ADC_H), > + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE, > + AXP20X_GPIO1_V_ADC_H), > + AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE, > + AXP20X_IPSOUT_V_HIGH_H), > + AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE, > + AXP20X_BATT_V_H), > + AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > + AXP20X_BATT_CHRG_I_H), > + AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > + AXP20X_BATT_DISCHRG_I_H), > +}; > + > +static const struct iio_chan_spec axp22x_adc_channels[] = { > + { > + .type = IIO_TEMP, > + .address = AXP22X_PMIC_TEMP_H, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > + BIT(IIO_CHAN_INFO_SCALE) | > + BIT(IIO_CHAN_INFO_OFFSET), > + .datasheet_name = "pmic_temp", > + }, > + AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE, > + AXP20X_BATT_V_H), > + AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > + AXP20X_BATT_CHRG_I_H), > + AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > + AXP20X_BATT_DISCHRG_I_H), > +}; > + > +static int axp20x_adc_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val) > +{ > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + int size = 12; > + > + /* > + * N.B.: Unlike the Chinese datasheets tell, the charging current is > + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > + * bits. > + */ > + if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I) > + size = 13; > + else > + size = 12; > + > + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > + if (*val < 0) > + return *val; > + > + return IIO_VAL_INT; > +} > + > +static int axp22x_adc_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val) > +{ > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + int size; > + > + /* > + * N.B.: Unlike the Chinese datasheets tell, the charging current is > + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > + * bits. > + */ > + if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I) > + size = 13; > + else > + size = 12; > + > + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > + if (*val < 0) > + return *val; > + > + return IIO_VAL_INT; > +} > + > +static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) > +{ > + switch (channel) { > + case AXP20X_ACIN_V: > + case AXP20X_VBUS_V: > + *val = 1; > + *val2 = 700000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_GPIO0_V: > + case AXP20X_GPIO1_V: > + *val = 0; > + *val2 = 500000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_BATT_V: > + *val = 1; > + *val2 = 100000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_IPSOUT_V: > + *val = 1; > + *val2 = 400000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_adc_scale_current(int channel, int *val, int *val2) > +{ > + switch (channel) { > + case AXP20X_ACIN_I: > + *val = 0; > + *val2 = 625000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_VBUS_I: > + *val = 0; > + *val2 = 375000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP20X_BATT_DISCHRG_I: > + case AXP20X_BATT_CHRG_I: > + *val = 0; > + *val2 = 500000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val, > + int *val2) > +{ > + switch (chan->type) { > + case IIO_VOLTAGE: > + return axp20x_adc_scale_voltage(chan->channel, val, val2); > + > + case IIO_CURRENT: > + return axp20x_adc_scale_current(chan->channel, val, val2); > + > + case IIO_TEMP: > + *val = 100; > + return IIO_VAL_INT; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, > + int *val2) > +{ > + switch (chan->type) { > + case IIO_VOLTAGE: > + if (chan->channel != AXP22X_BATT_V) > + return -EINVAL; > + > + *val = 1; > + *val2 = 100000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case IIO_CURRENT: > + *val = 0; > + *val2 = 500000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case IIO_TEMP: > + *val = 100; > + return IIO_VAL_INT; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel, > + int *val) > +{ > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + int ret; > + > + ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val); > + if (ret < 0) > + return ret; > + > + switch (channel) { > + case AXP20X_GPIO0_V: > + *val &= AXP20X_GPIO10_IN_RANGE_GPIO0; > + break; > + > + case AXP20X_GPIO1_V: > + *val &= AXP20X_GPIO10_IN_RANGE_GPIO1; > + break; > + > + default: > + return -EINVAL; > + } > + > + *val = !!(*val) * 700000; > + > + return IIO_VAL_INT; > +} > + > +static int axp20x_adc_offset(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val) > +{ > + switch (chan->type) { > + case IIO_VOLTAGE: > + return axp20x_adc_offset_voltage(indio_dev, chan->channel, val); > + > + case IIO_TEMP: > + *val = -1447; > + return IIO_VAL_INT; > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val, > + int *val2, long mask) > +{ > + switch (mask) { > + case IIO_CHAN_INFO_OFFSET: > + return axp20x_adc_offset(indio_dev, chan, val); > + > + case IIO_CHAN_INFO_SCALE: > + return axp20x_adc_scale(chan, val, val2); > + > + case IIO_CHAN_INFO_RAW: > + return axp20x_adc_raw(indio_dev, chan, val); > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp22x_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val, > + int *val2, long mask) > +{ > + switch (mask) { > + case IIO_CHAN_INFO_OFFSET: > + *val = -2677; > + return IIO_VAL_INT; > + > + case IIO_CHAN_INFO_SCALE: > + return axp22x_adc_scale(chan, val, val2); > + > + case IIO_CHAN_INFO_RAW: > + return axp22x_adc_raw(indio_dev, chan, val); > + > + default: > + return -EINVAL; > + } > +} > + > +static int axp20x_write_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int val, int val2, > + long mask) > +{ > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + unsigned int reg, regval; > + > + /* > + * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets > + * for (independently) GPIO0 and GPIO1 when in ADC mode. > + */ > + if (mask != IIO_CHAN_INFO_OFFSET) > + return -EINVAL; > + > + if (val != 0 && val != 700000) > + return -EINVAL; > + > + switch (chan->channel) { > + case AXP20X_GPIO0_V: > + reg = AXP20X_GPIO10_IN_RANGE_GPIO0; > + regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val); > + break; > + > + case AXP20X_GPIO1_V: > + reg = AXP20X_GPIO10_IN_RANGE_GPIO1; > + regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val); > + break; > + > + default: > + return -EINVAL; > + } > + > + return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg, > + regval); > +} > + > +static const struct iio_info axp20x_adc_iio_info = { > + .read_raw = axp20x_read_raw, > + .write_raw = axp20x_write_raw, > + .driver_module = THIS_MODULE, > +}; > + > +static const struct iio_info axp22x_adc_iio_info = { > + .read_raw = axp22x_read_raw, > + .driver_module = THIS_MODULE, > +}; > + > +static int axp20x_adc_rate(int rate) > +{ > + return AXP20X_ADC_RATE_HZ(rate); > +} > + > +static int axp22x_adc_rate(int rate) > +{ > + return AXP22X_ADC_RATE_HZ(rate); > +} > + > +struct axp_data { > + const struct iio_info *iio_info; > + int num_channels; > + struct iio_chan_spec const *channels; > + unsigned long adc_en1_mask; > + int (*adc_rate)(int rate); > + bool adc_en2; > + struct iio_map *maps; > +}; > + > +static const struct axp_data axp20x_data = { > + .iio_info = &axp20x_adc_iio_info, > + .num_channels = ARRAY_SIZE(axp20x_adc_channels), > + .channels = axp20x_adc_channels, > + .adc_en1_mask = AXP20X_ADC_EN1_MASK, > + .adc_rate = axp20x_adc_rate, > + .adc_en2 = true, > + .maps = axp20x_maps, > +}; > + > +static const struct axp_data axp22x_data = { > + .iio_info = &axp22x_adc_iio_info, > + .num_channels = ARRAY_SIZE(axp22x_adc_channels), > + .channels = axp22x_adc_channels, > + .adc_en1_mask = AXP22X_ADC_EN1_MASK, > + .adc_rate = axp22x_adc_rate, > + .adc_en2 = false, > + .maps = axp22x_maps, > +}; > + > +static const struct platform_device_id axp20x_adc_id_match[] = { > + { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, }, > + { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, }, > + { /* sentinel */ }, > +}; > +MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); > + > +static int axp20x_probe(struct platform_device *pdev) > +{ > + struct axp20x_adc_iio *info; > + struct iio_dev *indio_dev; > + struct axp20x_dev *axp20x_dev; > + int ret; > + > + axp20x_dev = dev_get_drvdata(pdev->dev.parent); > + > + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); > + if (!indio_dev) > + return -ENOMEM; > + > + info = iio_priv(indio_dev); > + platform_set_drvdata(pdev, indio_dev); > + > + info->regmap = axp20x_dev->regmap; > + indio_dev->dev.parent = &pdev->dev; > + indio_dev->dev.of_node = pdev->dev.of_node; > + indio_dev->modes = INDIO_DIRECT_MODE; > + > + info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data; > + > + indio_dev->name = platform_get_device_id(pdev)->name; > + indio_dev->info = info->data->iio_info; > + indio_dev->num_channels = info->data->num_channels; > + indio_dev->channels = info->data->channels; > + > + /* Enable the ADCs on IP */ > + regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask); > + > + if (info->data->adc_en2) > + /* Enable GPIO0/1 and internal temperature ADCs */ > + regmap_update_bits(info->regmap, AXP20X_ADC_EN2, > + AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK); > + > + /* Configure ADCs rate */ > + regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK, > + info->data->adc_rate(100)); > + > + ret = iio_map_array_register(indio_dev, info->data->maps); > + if (ret < 0) { > + dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret); > + goto fail_map; > + } > + > + ret = iio_device_register(indio_dev); > + if (ret < 0) { > + dev_err(&pdev->dev, "could not register the device\n"); > + goto fail_register; > + } > + > + return 0; > + > +fail_register: > + iio_map_array_unregister(indio_dev); > + > +fail_map: > + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > + > + if (info->data->adc_en2) > + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > + > + return ret; > +} > + > +static int axp20x_remove(struct platform_device *pdev) > +{ > + struct iio_dev *indio_dev = platform_get_drvdata(pdev); > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + > + iio_device_unregister(indio_dev); > + iio_map_array_unregister(indio_dev); > + > + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > + > + if (info->data->adc_en2) > + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > + > + return 0; > +} > + > +static struct platform_driver axp20x_adc_driver = { > + .driver = { > + .name = "axp20x-adc", > + }, > + .id_table = axp20x_adc_id_match, > + .probe = axp20x_probe, > + .remove = axp20x_remove, > +}; > + > +module_platform_driver(axp20x_adc_driver); > + > +MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs"); > +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); > +MODULE_LICENSE("GPL");
On Tue, 11 Apr 2017, Lee Jones wrote: > On Tue, 04 Apr 2017, Quentin Schulz wrote: > > > The X-Powers AXP20X and AXP22X PMICs have multiple ADCs. They expose the > > battery voltage, battery charge and discharge currents, AC-in and VBUS > > voltages and currents, 2 GPIOs muxable in ADC mode and PMIC temperature. > > > > This adds support for most of AXP20X and AXP22X ADCs. > > > > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> > > Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> > > Acked-by: Chen-Yu Tsai <wens@csie.org> > > Reviewed-by: Jonathan Cameron <jic23@kernel.org> > > --- > > > > Lee, could you merge this through the mfd tree please? > > => https://lkml.org/lkml/2017/3/22/47 > > Applied, thanks. Whoops, change of plan. Since this touched the Makefile and Kconfig, I'll have to send a pull-request. > > v4: > > - added missing space at the beginning of a comment, > > - tidied axp20x_adc_offset_voltage and axp20x_write_raw to use switch case > > instead of if conditions, > > - added MODULE_DEVICE_TABLE for axp20x_adc_id_match for module autoloading, > > - merged two lines in axp20x_remove, > > > > v3: > > - moved from switch to if condition in axp20x_adc_raw and > > axp22x_adc_raw, > > - removed DT support as DT node has been dropped, > > - use of platform_device_id > > - correctly defined the name of the iio device (name used to probe the > > driver), > > - added goto for errors in probe, > > - added iio_map_array_unregister to the remove function, > > > > v2: > > - removed unused defines, > > - changed BIT(x) to 1 << x when describing bits purpose for which 2 << > > x or 3 << x exists, to be consistent, > > - changed ADC rate defines to macro formulas, > > - reordered IIO channels, now different measures (current/voltage) of > > the same part of the PMIC (e.g. battery), have the same IIO channel in > > their respective IIO type. When a part of the PMIC have only one > > measure, a number is jumped, > > - left IIO channel mapping in DT to use iio_map structure, > > - removed indexing of ADC internal temperature, > > - removed unused iio_dev structure in axp20x_adc_iio, > > - added a structure for data specific to AXP20X or AXP22X PMICs instead > > of using an ID and an if condition when needing to separate the > > behaviour of both, > > - added a comment on batt_chrg_i really being on 12bits rather than > > what the Chinese datasheets say (13 bits), > > - corrected the offset for AXP22X PMIC temperature, > > - set the ADC rate to a value (100Hz) shared by the AXP20X and AXP22X, > > - created macro formulas to compute the ADC rate for each, > > - added a condition on presence of ADC_EN2 reg before setting/resetting > > it, > > - switched from devm_iio_device_unregister to the non-devm function > > because of the need for a remove function, > > - removed some dead code, > > > > drivers/iio/adc/Kconfig | 10 + > > drivers/iio/adc/Makefile | 1 + > > drivers/iio/adc/axp20x_adc.c | 617 +++++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 628 insertions(+) > > create mode 100644 drivers/iio/adc/axp20x_adc.c > > > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > > index d777a97..d15e1bd 100644 > > --- a/drivers/iio/adc/Kconfig > > +++ b/drivers/iio/adc/Kconfig > > @@ -154,6 +154,16 @@ config AT91_SAMA5D2_ADC > > To compile this driver as a module, choose M here: the module will be > > called at91-sama5d2_adc. > > > > +config AXP20X_ADC > > + tristate "X-Powers AXP20X and AXP22X ADC driver" > > + depends on MFD_AXP20X > > + help > > + Say yes here to have support for X-Powers power management IC (PMIC) > > + AXP20X and AXP22X ADC devices. > > + > > + To compile this driver as a module, choose M here: the module will be > > + called axp20x_adc. > > + > > config AXP288_ADC > > tristate "X-Powers AXP288 ADC driver" > > depends on MFD_AXP20X > > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > > index b11bb57..17899b5 100644 > > --- a/drivers/iio/adc/Makefile > > +++ b/drivers/iio/adc/Makefile > > @@ -16,6 +16,7 @@ obj-$(CONFIG_AD7887) += ad7887.o > > obj-$(CONFIG_AD799X) += ad799x.o > > obj-$(CONFIG_AT91_ADC) += at91_adc.o > > obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o > > +obj-$(CONFIG_AXP20X_ADC) += axp20x_adc.o > > obj-$(CONFIG_AXP288_ADC) += axp288_adc.o > > obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o > > obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o > > diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c > > new file mode 100644 > > index 0000000..11e1771 > > --- /dev/null > > +++ b/drivers/iio/adc/axp20x_adc.c > > @@ -0,0 +1,617 @@ > > +/* ADC driver for AXP20X and AXP22X PMICs > > + * > > + * Copyright (c) 2016 Free Electrons NextThing Co. > > + * Quentin Schulz <quentin.schulz@free-electrons.com> > > + * > > + * This program is free software; you can redistribute it and/or modify it under > > + * the terms of the GNU General Public License version 2 as published by the > > + * Free Software Foundation. > > + */ > > + > > +#include <linux/completion.h> > > +#include <linux/interrupt.h> > > +#include <linux/io.h> > > +#include <linux/module.h> > > +#include <linux/of.h> > > +#include <linux/of_device.h> > > +#include <linux/platform_device.h> > > +#include <linux/pm_runtime.h> > > +#include <linux/regmap.h> > > +#include <linux/thermal.h> > > + > > +#include <linux/iio/iio.h> > > +#include <linux/iio/driver.h> > > +#include <linux/iio/machine.h> > > +#include <linux/mfd/axp20x.h> > > + > > +#define AXP20X_ADC_EN1_MASK GENMASK(7, 0) > > + > > +#define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7)) > > +#define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0)) > > + > > +#define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0) > > +#define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1) > > +#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0)) > > +#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) > > + > > +#define AXP20X_ADC_RATE_MASK GENMASK(7, 6) > > +#define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK) > > +#define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK) > > + > > +#define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ > > + { \ > > + .type = _type, \ > > + .indexed = 1, \ > > + .channel = _channel, \ > > + .address = _reg, \ > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > > + BIT(IIO_CHAN_INFO_SCALE), \ > > + .datasheet_name = _name, \ > > + } > > + > > +#define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \ > > + { \ > > + .type = _type, \ > > + .indexed = 1, \ > > + .channel = _channel, \ > > + .address = _reg, \ > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > > + BIT(IIO_CHAN_INFO_SCALE) |\ > > + BIT(IIO_CHAN_INFO_OFFSET),\ > > + .datasheet_name = _name, \ > > + } > > + > > +struct axp_data; > > + > > +struct axp20x_adc_iio { > > + struct regmap *regmap; > > + struct axp_data *data; > > +}; > > + > > +enum axp20x_adc_channel_v { > > + AXP20X_ACIN_V = 0, > > + AXP20X_VBUS_V, > > + AXP20X_TS_IN, > > + AXP20X_GPIO0_V, > > + AXP20X_GPIO1_V, > > + AXP20X_IPSOUT_V, > > + AXP20X_BATT_V, > > +}; > > + > > +enum axp20x_adc_channel_i { > > + AXP20X_ACIN_I = 0, > > + AXP20X_VBUS_I, > > + AXP20X_BATT_CHRG_I, > > + AXP20X_BATT_DISCHRG_I, > > +}; > > + > > +enum axp22x_adc_channel_v { > > + AXP22X_TS_IN = 0, > > + AXP22X_BATT_V, > > +}; > > + > > +enum axp22x_adc_channel_i { > > + AXP22X_BATT_CHRG_I = 1, > > + AXP22X_BATT_DISCHRG_I, > > +}; > > + > > +static struct iio_map axp20x_maps[] = { > > + { > > + .consumer_dev_name = "axp20x-usb-power-supply", > > + .consumer_channel = "vbus_v", > > + .adc_channel_label = "vbus_v", > > + }, { > > + .consumer_dev_name = "axp20x-usb-power-supply", > > + .consumer_channel = "vbus_i", > > + .adc_channel_label = "vbus_i", > > + }, { > > + .consumer_dev_name = "axp20x-ac-power-supply", > > + .consumer_channel = "acin_v", > > + .adc_channel_label = "acin_v", > > + }, { > > + .consumer_dev_name = "axp20x-ac-power-supply", > > + .consumer_channel = "acin_i", > > + .adc_channel_label = "acin_i", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_v", > > + .adc_channel_label = "batt_v", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_chrg_i", > > + .adc_channel_label = "batt_chrg_i", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_dischrg_i", > > + .adc_channel_label = "batt_dischrg_i", > > + }, { /* sentinel */ } > > +}; > > + > > +static struct iio_map axp22x_maps[] = { > > + { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_v", > > + .adc_channel_label = "batt_v", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_chrg_i", > > + .adc_channel_label = "batt_chrg_i", > > + }, { > > + .consumer_dev_name = "axp20x-battery-power-supply", > > + .consumer_channel = "batt_dischrg_i", > > + .adc_channel_label = "batt_dischrg_i", > > + }, { /* sentinel */ } > > +}; > > + > > +/* > > + * Channels are mapped by physical system. Their channels share the same index. > > + * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw. > > + * The only exception is for the battery. batt_v will be in_voltage6_raw and > > + * charge current in_current6_raw and discharge current will be in_current7_raw. > > + */ > > +static const struct iio_chan_spec axp20x_adc_channels[] = { > > + AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE, > > + AXP20X_ACIN_V_ADC_H), > > + AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT, > > + AXP20X_ACIN_I_ADC_H), > > + AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE, > > + AXP20X_VBUS_V_ADC_H), > > + AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT, > > + AXP20X_VBUS_I_ADC_H), > > + { > > + .type = IIO_TEMP, > > + .address = AXP20X_TEMP_ADC_H, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > > + BIT(IIO_CHAN_INFO_SCALE) | > > + BIT(IIO_CHAN_INFO_OFFSET), > > + .datasheet_name = "pmic_temp", > > + }, > > + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE, > > + AXP20X_GPIO0_V_ADC_H), > > + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE, > > + AXP20X_GPIO1_V_ADC_H), > > + AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE, > > + AXP20X_IPSOUT_V_HIGH_H), > > + AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE, > > + AXP20X_BATT_V_H), > > + AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > > + AXP20X_BATT_CHRG_I_H), > > + AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > > + AXP20X_BATT_DISCHRG_I_H), > > +}; > > + > > +static const struct iio_chan_spec axp22x_adc_channels[] = { > > + { > > + .type = IIO_TEMP, > > + .address = AXP22X_PMIC_TEMP_H, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > > + BIT(IIO_CHAN_INFO_SCALE) | > > + BIT(IIO_CHAN_INFO_OFFSET), > > + .datasheet_name = "pmic_temp", > > + }, > > + AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE, > > + AXP20X_BATT_V_H), > > + AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > > + AXP20X_BATT_CHRG_I_H), > > + AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > > + AXP20X_BATT_DISCHRG_I_H), > > +}; > > + > > +static int axp20x_adc_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val) > > +{ > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + int size = 12; > > + > > + /* > > + * N.B.: Unlike the Chinese datasheets tell, the charging current is > > + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > > + * bits. > > + */ > > + if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I) > > + size = 13; > > + else > > + size = 12; > > + > > + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > > + if (*val < 0) > > + return *val; > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int axp22x_adc_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val) > > +{ > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + int size; > > + > > + /* > > + * N.B.: Unlike the Chinese datasheets tell, the charging current is > > + * stored on 12 bits, not 13 bits. Only discharging current is on 13 > > + * bits. > > + */ > > + if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I) > > + size = 13; > > + else > > + size = 12; > > + > > + *val = axp20x_read_variable_width(info->regmap, chan->address, size); > > + if (*val < 0) > > + return *val; > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) > > +{ > > + switch (channel) { > > + case AXP20X_ACIN_V: > > + case AXP20X_VBUS_V: > > + *val = 1; > > + *val2 = 700000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_GPIO0_V: > > + case AXP20X_GPIO1_V: > > + *val = 0; > > + *val2 = 500000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_BATT_V: > > + *val = 1; > > + *val2 = 100000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_IPSOUT_V: > > + *val = 1; > > + *val2 = 400000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_adc_scale_current(int channel, int *val, int *val2) > > +{ > > + switch (channel) { > > + case AXP20X_ACIN_I: > > + *val = 0; > > + *val2 = 625000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_VBUS_I: > > + *val = 0; > > + *val2 = 375000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case AXP20X_BATT_DISCHRG_I: > > + case AXP20X_BATT_CHRG_I: > > + *val = 0; > > + *val2 = 500000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val, > > + int *val2) > > +{ > > + switch (chan->type) { > > + case IIO_VOLTAGE: > > + return axp20x_adc_scale_voltage(chan->channel, val, val2); > > + > > + case IIO_CURRENT: > > + return axp20x_adc_scale_current(chan->channel, val, val2); > > + > > + case IIO_TEMP: > > + *val = 100; > > + return IIO_VAL_INT; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, > > + int *val2) > > +{ > > + switch (chan->type) { > > + case IIO_VOLTAGE: > > + if (chan->channel != AXP22X_BATT_V) > > + return -EINVAL; > > + > > + *val = 1; > > + *val2 = 100000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case IIO_CURRENT: > > + *val = 0; > > + *val2 = 500000; > > + return IIO_VAL_INT_PLUS_MICRO; > > + > > + case IIO_TEMP: > > + *val = 100; > > + return IIO_VAL_INT; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel, > > + int *val) > > +{ > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + int ret; > > + > > + ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val); > > + if (ret < 0) > > + return ret; > > + > > + switch (channel) { > > + case AXP20X_GPIO0_V: > > + *val &= AXP20X_GPIO10_IN_RANGE_GPIO0; > > + break; > > + > > + case AXP20X_GPIO1_V: > > + *val &= AXP20X_GPIO10_IN_RANGE_GPIO1; > > + break; > > + > > + default: > > + return -EINVAL; > > + } > > + > > + *val = !!(*val) * 700000; > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int axp20x_adc_offset(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val) > > +{ > > + switch (chan->type) { > > + case IIO_VOLTAGE: > > + return axp20x_adc_offset_voltage(indio_dev, chan->channel, val); > > + > > + case IIO_TEMP: > > + *val = -1447; > > + return IIO_VAL_INT; > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_read_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val, > > + int *val2, long mask) > > +{ > > + switch (mask) { > > + case IIO_CHAN_INFO_OFFSET: > > + return axp20x_adc_offset(indio_dev, chan, val); > > + > > + case IIO_CHAN_INFO_SCALE: > > + return axp20x_adc_scale(chan, val, val2); > > + > > + case IIO_CHAN_INFO_RAW: > > + return axp20x_adc_raw(indio_dev, chan, val); > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp22x_read_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int *val, > > + int *val2, long mask) > > +{ > > + switch (mask) { > > + case IIO_CHAN_INFO_OFFSET: > > + *val = -2677; > > + return IIO_VAL_INT; > > + > > + case IIO_CHAN_INFO_SCALE: > > + return axp22x_adc_scale(chan, val, val2); > > + > > + case IIO_CHAN_INFO_RAW: > > + return axp22x_adc_raw(indio_dev, chan, val); > > + > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int axp20x_write_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, int val, int val2, > > + long mask) > > +{ > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + unsigned int reg, regval; > > + > > + /* > > + * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets > > + * for (independently) GPIO0 and GPIO1 when in ADC mode. > > + */ > > + if (mask != IIO_CHAN_INFO_OFFSET) > > + return -EINVAL; > > + > > + if (val != 0 && val != 700000) > > + return -EINVAL; > > + > > + switch (chan->channel) { > > + case AXP20X_GPIO0_V: > > + reg = AXP20X_GPIO10_IN_RANGE_GPIO0; > > + regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val); > > + break; > > + > > + case AXP20X_GPIO1_V: > > + reg = AXP20X_GPIO10_IN_RANGE_GPIO1; > > + regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val); > > + break; > > + > > + default: > > + return -EINVAL; > > + } > > + > > + return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg, > > + regval); > > +} > > + > > +static const struct iio_info axp20x_adc_iio_info = { > > + .read_raw = axp20x_read_raw, > > + .write_raw = axp20x_write_raw, > > + .driver_module = THIS_MODULE, > > +}; > > + > > +static const struct iio_info axp22x_adc_iio_info = { > > + .read_raw = axp22x_read_raw, > > + .driver_module = THIS_MODULE, > > +}; > > + > > +static int axp20x_adc_rate(int rate) > > +{ > > + return AXP20X_ADC_RATE_HZ(rate); > > +} > > + > > +static int axp22x_adc_rate(int rate) > > +{ > > + return AXP22X_ADC_RATE_HZ(rate); > > +} > > + > > +struct axp_data { > > + const struct iio_info *iio_info; > > + int num_channels; > > + struct iio_chan_spec const *channels; > > + unsigned long adc_en1_mask; > > + int (*adc_rate)(int rate); > > + bool adc_en2; > > + struct iio_map *maps; > > +}; > > + > > +static const struct axp_data axp20x_data = { > > + .iio_info = &axp20x_adc_iio_info, > > + .num_channels = ARRAY_SIZE(axp20x_adc_channels), > > + .channels = axp20x_adc_channels, > > + .adc_en1_mask = AXP20X_ADC_EN1_MASK, > > + .adc_rate = axp20x_adc_rate, > > + .adc_en2 = true, > > + .maps = axp20x_maps, > > +}; > > + > > +static const struct axp_data axp22x_data = { > > + .iio_info = &axp22x_adc_iio_info, > > + .num_channels = ARRAY_SIZE(axp22x_adc_channels), > > + .channels = axp22x_adc_channels, > > + .adc_en1_mask = AXP22X_ADC_EN1_MASK, > > + .adc_rate = axp22x_adc_rate, > > + .adc_en2 = false, > > + .maps = axp22x_maps, > > +}; > > + > > +static const struct platform_device_id axp20x_adc_id_match[] = { > > + { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, }, > > + { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, }, > > + { /* sentinel */ }, > > +}; > > +MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); > > + > > +static int axp20x_probe(struct platform_device *pdev) > > +{ > > + struct axp20x_adc_iio *info; > > + struct iio_dev *indio_dev; > > + struct axp20x_dev *axp20x_dev; > > + int ret; > > + > > + axp20x_dev = dev_get_drvdata(pdev->dev.parent); > > + > > + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); > > + if (!indio_dev) > > + return -ENOMEM; > > + > > + info = iio_priv(indio_dev); > > + platform_set_drvdata(pdev, indio_dev); > > + > > + info->regmap = axp20x_dev->regmap; > > + indio_dev->dev.parent = &pdev->dev; > > + indio_dev->dev.of_node = pdev->dev.of_node; > > + indio_dev->modes = INDIO_DIRECT_MODE; > > + > > + info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data; > > + > > + indio_dev->name = platform_get_device_id(pdev)->name; > > + indio_dev->info = info->data->iio_info; > > + indio_dev->num_channels = info->data->num_channels; > > + indio_dev->channels = info->data->channels; > > + > > + /* Enable the ADCs on IP */ > > + regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask); > > + > > + if (info->data->adc_en2) > > + /* Enable GPIO0/1 and internal temperature ADCs */ > > + regmap_update_bits(info->regmap, AXP20X_ADC_EN2, > > + AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK); > > + > > + /* Configure ADCs rate */ > > + regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK, > > + info->data->adc_rate(100)); > > + > > + ret = iio_map_array_register(indio_dev, info->data->maps); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret); > > + goto fail_map; > > + } > > + > > + ret = iio_device_register(indio_dev); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "could not register the device\n"); > > + goto fail_register; > > + } > > + > > + return 0; > > + > > +fail_register: > > + iio_map_array_unregister(indio_dev); > > + > > +fail_map: > > + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > > + > > + if (info->data->adc_en2) > > + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > > + > > + return ret; > > +} > > + > > +static int axp20x_remove(struct platform_device *pdev) > > +{ > > + struct iio_dev *indio_dev = platform_get_drvdata(pdev); > > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > > + > > + iio_device_unregister(indio_dev); > > + iio_map_array_unregister(indio_dev); > > + > > + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); > > + > > + if (info->data->adc_en2) > > + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); > > + > > + return 0; > > +} > > + > > +static struct platform_driver axp20x_adc_driver = { > > + .driver = { > > + .name = "axp20x-adc", > > + }, > > + .id_table = axp20x_adc_id_match, > > + .probe = axp20x_probe, > > + .remove = axp20x_remove, > > +}; > > + > > +module_platform_driver(axp20x_adc_driver); > > + > > +MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs"); > > +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); > > +MODULE_LICENSE("GPL"); >
On 11/04/17 11:05, Lee Jones wrote: > Enjoy! > > The following changes since commit c1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201: > > Linux 4.11-rc1 (2017-03-05 12:59:56 -0800) > > are available in the git repository at: > > git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git ib-mfd-iio-v4.12 > > for you to fetch changes up to f2499ab450d3052097ba53a7d763f767935c0c59: > > iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs (2017-04-11 11:02:33 +0100) > > ---------------------------------------------------------------- > Immutable branch between MFD and IIO due for the v4.12 merge window > > ---------------------------------------------------------------- > Quentin Schulz (1): > iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs > > drivers/iio/adc/Kconfig | 10 + > drivers/iio/adc/Makefile | 1 + > drivers/iio/adc/axp20x_adc.c | 617 +++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 628 insertions(+) > create mode 100644 drivers/iio/adc/axp20x_adc.c > Hi Lee, Thanks for doing this, but the reason it was going to go through your tree in the first place was a dependency on commit 4707274714ef ("mfd: axp20x: Correct name of temperature data ADC registers") Not present in the immutable branch. There isn't much time for anything else going on around this driver though so other than a possible merge conflict on the Kconfig and Makefile shouldn't matter if this just goes through mfd. (famous last words ;) Jonathan
On Fri, 14 Apr 2017, Jonathan Cameron wrote: > On 11/04/17 11:05, Lee Jones wrote: > > Enjoy! > > > > The following changes since commit c1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201: > > > > Linux 4.11-rc1 (2017-03-05 12:59:56 -0800) > > > > are available in the git repository at: > > > > git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git ib-mfd-iio-v4.12 > > > > for you to fetch changes up to f2499ab450d3052097ba53a7d763f767935c0c59: > > > > iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs (2017-04-11 11:02:33 +0100) > > > > ---------------------------------------------------------------- > > Immutable branch between MFD and IIO due for the v4.12 merge window > > > > ---------------------------------------------------------------- > > Quentin Schulz (1): > > iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs > > > > drivers/iio/adc/Kconfig | 10 + > > drivers/iio/adc/Makefile | 1 + > > drivers/iio/adc/axp20x_adc.c | 617 +++++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 628 insertions(+) > > create mode 100644 drivers/iio/adc/axp20x_adc.c > > > Hi Lee, > > Thanks for doing this, but the reason it was going to go through your > tree in the first place was a dependency on > commit 4707274714ef ("mfd: axp20x: Correct name of temperature data ADC registers") > > Not present in the immutable branch. > > There isn't much time for anything else going on around this driver though > so other than a possible merge conflict on the Kconfig and Makefile shouldn't > matter if this just goes through mfd. (famous last words ;) It's not as though you committed it to text and sent it out to a public mailing list for us all to reference though is it? Doh!
On 24/04/17 12:02, Lee Jones wrote: > On Fri, 14 Apr 2017, Jonathan Cameron wrote: > >> On 11/04/17 11:05, Lee Jones wrote: >>> Enjoy! >>> >>> The following changes since commit c1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201: >>> >>> Linux 4.11-rc1 (2017-03-05 12:59:56 -0800) >>> >>> are available in the git repository at: >>> >>> git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git ib-mfd-iio-v4.12 >>> >>> for you to fetch changes up to f2499ab450d3052097ba53a7d763f767935c0c59: >>> >>> iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs (2017-04-11 11:02:33 +0100) >>> >>> ---------------------------------------------------------------- >>> Immutable branch between MFD and IIO due for the v4.12 merge window >>> >>> ---------------------------------------------------------------- >>> Quentin Schulz (1): >>> iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs >>> >>> drivers/iio/adc/Kconfig | 10 + >>> drivers/iio/adc/Makefile | 1 + >>> drivers/iio/adc/axp20x_adc.c | 617 +++++++++++++++++++++++++++++++++++++++++++ >>> 3 files changed, 628 insertions(+) >>> create mode 100644 drivers/iio/adc/axp20x_adc.c >>> >> Hi Lee, >> >> Thanks for doing this, but the reason it was going to go through your >> tree in the first place was a dependency on >> commit 4707274714ef ("mfd: axp20x: Correct name of temperature data ADC registers") >> >> Not present in the immutable branch. >> >> There isn't much time for anything else going on around this driver though >> so other than a possible merge conflict on the Kconfig and Makefile shouldn't >> matter if this just goes through mfd. (famous last words ;) > > It's not as though you committed it to text and sent it out to a > public mailing list for us all to reference though is it? Doh! > It came up in the original discussions (which was the only reason I knew). Chen-Yu Tsai in email: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-March/495789.html Quentin did put a link in his request that you take it, but removing the need to click would have been better! Jonathan
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index d777a97..d15e1bd 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -154,6 +154,16 @@ config AT91_SAMA5D2_ADC To compile this driver as a module, choose M here: the module will be called at91-sama5d2_adc. +config AXP20X_ADC + tristate "X-Powers AXP20X and AXP22X ADC driver" + depends on MFD_AXP20X + help + Say yes here to have support for X-Powers power management IC (PMIC) + AXP20X and AXP22X ADC devices. + + To compile this driver as a module, choose M here: the module will be + called axp20x_adc. + config AXP288_ADC tristate "X-Powers AXP288 ADC driver" depends on MFD_AXP20X diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index b11bb57..17899b5 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_AD7887) += ad7887.o obj-$(CONFIG_AD799X) += ad799x.o obj-$(CONFIG_AT91_ADC) += at91_adc.o obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o +obj-$(CONFIG_AXP20X_ADC) += axp20x_adc.o obj-$(CONFIG_AXP288_ADC) += axp288_adc.o obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c new file mode 100644 index 0000000..11e1771 --- /dev/null +++ b/drivers/iio/adc/axp20x_adc.c @@ -0,0 +1,617 @@ +/* ADC driver for AXP20X and AXP22X PMICs + * + * Copyright (c) 2016 Free Electrons NextThing Co. + * Quentin Schulz <quentin.schulz@free-electrons.com> + * + * This program is free software; you can redistribute it and/or modify it under + * the terms of the GNU General Public License version 2 as published by the + * Free Software Foundation. + */ + +#include <linux/completion.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> +#include <linux/thermal.h> + +#include <linux/iio/iio.h> +#include <linux/iio/driver.h> +#include <linux/iio/machine.h> +#include <linux/mfd/axp20x.h> + +#define AXP20X_ADC_EN1_MASK GENMASK(7, 0) + +#define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7)) +#define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0)) + +#define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0) +#define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1) +#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0)) +#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) + +#define AXP20X_ADC_RATE_MASK GENMASK(7, 6) +#define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK) +#define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK) + +#define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ + { \ + .type = _type, \ + .indexed = 1, \ + .channel = _channel, \ + .address = _reg, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .datasheet_name = _name, \ + } + +#define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \ + { \ + .type = _type, \ + .indexed = 1, \ + .channel = _channel, \ + .address = _reg, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE) |\ + BIT(IIO_CHAN_INFO_OFFSET),\ + .datasheet_name = _name, \ + } + +struct axp_data; + +struct axp20x_adc_iio { + struct regmap *regmap; + struct axp_data *data; +}; + +enum axp20x_adc_channel_v { + AXP20X_ACIN_V = 0, + AXP20X_VBUS_V, + AXP20X_TS_IN, + AXP20X_GPIO0_V, + AXP20X_GPIO1_V, + AXP20X_IPSOUT_V, + AXP20X_BATT_V, +}; + +enum axp20x_adc_channel_i { + AXP20X_ACIN_I = 0, + AXP20X_VBUS_I, + AXP20X_BATT_CHRG_I, + AXP20X_BATT_DISCHRG_I, +}; + +enum axp22x_adc_channel_v { + AXP22X_TS_IN = 0, + AXP22X_BATT_V, +}; + +enum axp22x_adc_channel_i { + AXP22X_BATT_CHRG_I = 1, + AXP22X_BATT_DISCHRG_I, +}; + +static struct iio_map axp20x_maps[] = { + { + .consumer_dev_name = "axp20x-usb-power-supply", + .consumer_channel = "vbus_v", + .adc_channel_label = "vbus_v", + }, { + .consumer_dev_name = "axp20x-usb-power-supply", + .consumer_channel = "vbus_i", + .adc_channel_label = "vbus_i", + }, { + .consumer_dev_name = "axp20x-ac-power-supply", + .consumer_channel = "acin_v", + .adc_channel_label = "acin_v", + }, { + .consumer_dev_name = "axp20x-ac-power-supply", + .consumer_channel = "acin_i", + .adc_channel_label = "acin_i", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_v", + .adc_channel_label = "batt_v", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_chrg_i", + .adc_channel_label = "batt_chrg_i", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_dischrg_i", + .adc_channel_label = "batt_dischrg_i", + }, { /* sentinel */ } +}; + +static struct iio_map axp22x_maps[] = { + { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_v", + .adc_channel_label = "batt_v", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_chrg_i", + .adc_channel_label = "batt_chrg_i", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_dischrg_i", + .adc_channel_label = "batt_dischrg_i", + }, { /* sentinel */ } +}; + +/* + * Channels are mapped by physical system. Their channels share the same index. + * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw. + * The only exception is for the battery. batt_v will be in_voltage6_raw and + * charge current in_current6_raw and discharge current will be in_current7_raw. + */ +static const struct iio_chan_spec axp20x_adc_channels[] = { + AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE, + AXP20X_ACIN_V_ADC_H), + AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT, + AXP20X_ACIN_I_ADC_H), + AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE, + AXP20X_VBUS_V_ADC_H), + AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT, + AXP20X_VBUS_I_ADC_H), + { + .type = IIO_TEMP, + .address = AXP20X_TEMP_ADC_H, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET), + .datasheet_name = "pmic_temp", + }, + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE, + AXP20X_GPIO0_V_ADC_H), + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE, + AXP20X_GPIO1_V_ADC_H), + AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE, + AXP20X_IPSOUT_V_HIGH_H), + AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE, + AXP20X_BATT_V_H), + AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, + AXP20X_BATT_CHRG_I_H), + AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, + AXP20X_BATT_DISCHRG_I_H), +}; + +static const struct iio_chan_spec axp22x_adc_channels[] = { + { + .type = IIO_TEMP, + .address = AXP22X_PMIC_TEMP_H, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET), + .datasheet_name = "pmic_temp", + }, + AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE, + AXP20X_BATT_V_H), + AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, + AXP20X_BATT_CHRG_I_H), + AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, + AXP20X_BATT_DISCHRG_I_H), +}; + +static int axp20x_adc_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val) +{ + struct axp20x_adc_iio *info = iio_priv(indio_dev); + int size = 12; + + /* + * N.B.: Unlike the Chinese datasheets tell, the charging current is + * stored on 12 bits, not 13 bits. Only discharging current is on 13 + * bits. + */ + if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I) + size = 13; + else + size = 12; + + *val = axp20x_read_variable_width(info->regmap, chan->address, size); + if (*val < 0) + return *val; + + return IIO_VAL_INT; +} + +static int axp22x_adc_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val) +{ + struct axp20x_adc_iio *info = iio_priv(indio_dev); + int size; + + /* + * N.B.: Unlike the Chinese datasheets tell, the charging current is + * stored on 12 bits, not 13 bits. Only discharging current is on 13 + * bits. + */ + if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I) + size = 13; + else + size = 12; + + *val = axp20x_read_variable_width(info->regmap, chan->address, size); + if (*val < 0) + return *val; + + return IIO_VAL_INT; +} + +static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) +{ + switch (channel) { + case AXP20X_ACIN_V: + case AXP20X_VBUS_V: + *val = 1; + *val2 = 700000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_GPIO0_V: + case AXP20X_GPIO1_V: + *val = 0; + *val2 = 500000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_BATT_V: + *val = 1; + *val2 = 100000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_IPSOUT_V: + *val = 1; + *val2 = 400000; + return IIO_VAL_INT_PLUS_MICRO; + + default: + return -EINVAL; + } +} + +static int axp20x_adc_scale_current(int channel, int *val, int *val2) +{ + switch (channel) { + case AXP20X_ACIN_I: + *val = 0; + *val2 = 625000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_VBUS_I: + *val = 0; + *val2 = 375000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_BATT_DISCHRG_I: + case AXP20X_BATT_CHRG_I: + *val = 0; + *val2 = 500000; + return IIO_VAL_INT_PLUS_MICRO; + + default: + return -EINVAL; + } +} + +static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val, + int *val2) +{ + switch (chan->type) { + case IIO_VOLTAGE: + return axp20x_adc_scale_voltage(chan->channel, val, val2); + + case IIO_CURRENT: + return axp20x_adc_scale_current(chan->channel, val, val2); + + case IIO_TEMP: + *val = 100; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, + int *val2) +{ + switch (chan->type) { + case IIO_VOLTAGE: + if (chan->channel != AXP22X_BATT_V) + return -EINVAL; + + *val = 1; + *val2 = 100000; + return IIO_VAL_INT_PLUS_MICRO; + + case IIO_CURRENT: + *val = 0; + *val2 = 500000; + return IIO_VAL_INT_PLUS_MICRO; + + case IIO_TEMP: + *val = 100; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel, + int *val) +{ + struct axp20x_adc_iio *info = iio_priv(indio_dev); + int ret; + + ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val); + if (ret < 0) + return ret; + + switch (channel) { + case AXP20X_GPIO0_V: + *val &= AXP20X_GPIO10_IN_RANGE_GPIO0; + break; + + case AXP20X_GPIO1_V: + *val &= AXP20X_GPIO10_IN_RANGE_GPIO1; + break; + + default: + return -EINVAL; + } + + *val = !!(*val) * 700000; + + return IIO_VAL_INT; +} + +static int axp20x_adc_offset(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val) +{ + switch (chan->type) { + case IIO_VOLTAGE: + return axp20x_adc_offset_voltage(indio_dev, chan->channel, val); + + case IIO_TEMP: + *val = -1447; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int axp20x_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_OFFSET: + return axp20x_adc_offset(indio_dev, chan, val); + + case IIO_CHAN_INFO_SCALE: + return axp20x_adc_scale(chan, val, val2); + + case IIO_CHAN_INFO_RAW: + return axp20x_adc_raw(indio_dev, chan, val); + + default: + return -EINVAL; + } +} + +static int axp22x_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_OFFSET: + *val = -2677; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + return axp22x_adc_scale(chan, val, val2); + + case IIO_CHAN_INFO_RAW: + return axp22x_adc_raw(indio_dev, chan, val); + + default: + return -EINVAL; + } +} + +static int axp20x_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, int val2, + long mask) +{ + struct axp20x_adc_iio *info = iio_priv(indio_dev); + unsigned int reg, regval; + + /* + * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets + * for (independently) GPIO0 and GPIO1 when in ADC mode. + */ + if (mask != IIO_CHAN_INFO_OFFSET) + return -EINVAL; + + if (val != 0 && val != 700000) + return -EINVAL; + + switch (chan->channel) { + case AXP20X_GPIO0_V: + reg = AXP20X_GPIO10_IN_RANGE_GPIO0; + regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val); + break; + + case AXP20X_GPIO1_V: + reg = AXP20X_GPIO10_IN_RANGE_GPIO1; + regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val); + break; + + default: + return -EINVAL; + } + + return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg, + regval); +} + +static const struct iio_info axp20x_adc_iio_info = { + .read_raw = axp20x_read_raw, + .write_raw = axp20x_write_raw, + .driver_module = THIS_MODULE, +}; + +static const struct iio_info axp22x_adc_iio_info = { + .read_raw = axp22x_read_raw, + .driver_module = THIS_MODULE, +}; + +static int axp20x_adc_rate(int rate) +{ + return AXP20X_ADC_RATE_HZ(rate); +} + +static int axp22x_adc_rate(int rate) +{ + return AXP22X_ADC_RATE_HZ(rate); +} + +struct axp_data { + const struct iio_info *iio_info; + int num_channels; + struct iio_chan_spec const *channels; + unsigned long adc_en1_mask; + int (*adc_rate)(int rate); + bool adc_en2; + struct iio_map *maps; +}; + +static const struct axp_data axp20x_data = { + .iio_info = &axp20x_adc_iio_info, + .num_channels = ARRAY_SIZE(axp20x_adc_channels), + .channels = axp20x_adc_channels, + .adc_en1_mask = AXP20X_ADC_EN1_MASK, + .adc_rate = axp20x_adc_rate, + .adc_en2 = true, + .maps = axp20x_maps, +}; + +static const struct axp_data axp22x_data = { + .iio_info = &axp22x_adc_iio_info, + .num_channels = ARRAY_SIZE(axp22x_adc_channels), + .channels = axp22x_adc_channels, + .adc_en1_mask = AXP22X_ADC_EN1_MASK, + .adc_rate = axp22x_adc_rate, + .adc_en2 = false, + .maps = axp22x_maps, +}; + +static const struct platform_device_id axp20x_adc_id_match[] = { + { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, }, + { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); + +static int axp20x_probe(struct platform_device *pdev) +{ + struct axp20x_adc_iio *info; + struct iio_dev *indio_dev; + struct axp20x_dev *axp20x_dev; + int ret; + + axp20x_dev = dev_get_drvdata(pdev->dev.parent); + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); + if (!indio_dev) + return -ENOMEM; + + info = iio_priv(indio_dev); + platform_set_drvdata(pdev, indio_dev); + + info->regmap = axp20x_dev->regmap; + indio_dev->dev.parent = &pdev->dev; + indio_dev->dev.of_node = pdev->dev.of_node; + indio_dev->modes = INDIO_DIRECT_MODE; + + info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data; + + indio_dev->name = platform_get_device_id(pdev)->name; + indio_dev->info = info->data->iio_info; + indio_dev->num_channels = info->data->num_channels; + indio_dev->channels = info->data->channels; + + /* Enable the ADCs on IP */ + regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask); + + if (info->data->adc_en2) + /* Enable GPIO0/1 and internal temperature ADCs */ + regmap_update_bits(info->regmap, AXP20X_ADC_EN2, + AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK); + + /* Configure ADCs rate */ + regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK, + info->data->adc_rate(100)); + + ret = iio_map_array_register(indio_dev, info->data->maps); + if (ret < 0) { + dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret); + goto fail_map; + } + + ret = iio_device_register(indio_dev); + if (ret < 0) { + dev_err(&pdev->dev, "could not register the device\n"); + goto fail_register; + } + + return 0; + +fail_register: + iio_map_array_unregister(indio_dev); + +fail_map: + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); + + if (info->data->adc_en2) + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); + + return ret; +} + +static int axp20x_remove(struct platform_device *pdev) +{ + struct iio_dev *indio_dev = platform_get_drvdata(pdev); + struct axp20x_adc_iio *info = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + iio_map_array_unregister(indio_dev); + + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); + + if (info->data->adc_en2) + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); + + return 0; +} + +static struct platform_driver axp20x_adc_driver = { + .driver = { + .name = "axp20x-adc", + }, + .id_table = axp20x_adc_id_match, + .probe = axp20x_probe, + .remove = axp20x_remove, +}; + +module_platform_driver(axp20x_adc_driver); + +MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs"); +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); +MODULE_LICENSE("GPL");