| Message ID | 20191011184852.12202-3-manivannan.sadhasivam@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for ADUX1020 sensor | expand |
On Sat, 12 Oct 2019 00:18:52 +0530 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> wrote: > Add initial support for Analog Devices ADUX1020 Photometric sensor. > Only proximity mode has been enabled for now. > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Applied to the togreg branch of iio.git and pushed out as testing for the autobuilders to poke at it. Note I will be rebasing my tree shortly to move to current cycle, so testing branch is even less 'stable' than normal ;) Thanks, Jonathan > --- > drivers/iio/light/Kconfig | 11 + > drivers/iio/light/Makefile | 1 + > drivers/iio/light/adux1020.c | 849 +++++++++++++++++++++++++++++++++++ > 3 files changed, 861 insertions(+) > create mode 100644 drivers/iio/light/adux1020.c > > diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig > index 08d7e1ef2186..3f8c8689cd89 100644 > --- a/drivers/iio/light/Kconfig > +++ b/drivers/iio/light/Kconfig > @@ -32,6 +32,17 @@ config ADJD_S311 > This driver can also be built as a module. If so, the module > will be called adjd_s311. > > +config ADUX1020 > + tristate "ADUX1020 photometric sensor" > + select REGMAP_I2C > + depends on I2C > + help > + Say Y here if you want to build a driver for the Analog Devices > + ADUX1020 photometric sensor. > + > + To compile this driver as a module, choose M here: the > + module will be called adux1020. > + > config AL3320A > tristate "AL3320A ambient light sensor" > depends on I2C > diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile > index 00d1f9b98f39..5d650ce46a40 100644 > --- a/drivers/iio/light/Makefile > +++ b/drivers/iio/light/Makefile > @@ -6,6 +6,7 @@ > # When adding new entries keep the list in alphabetical order > obj-$(CONFIG_ACPI_ALS) += acpi-als.o > obj-$(CONFIG_ADJD_S311) += adjd_s311.o > +obj-$(CONFIG_ADUX1020) += adux1020.o > obj-$(CONFIG_AL3320A) += al3320a.o > obj-$(CONFIG_APDS9300) += apds9300.o > obj-$(CONFIG_APDS9960) += apds9960.o > diff --git a/drivers/iio/light/adux1020.c b/drivers/iio/light/adux1020.c > new file mode 100644 > index 000000000000..830e5e95d58f > --- /dev/null > +++ b/drivers/iio/light/adux1020.c > @@ -0,0 +1,849 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor > + * > + * Copyright (C) 2019 Linaro Ltd. > + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > + * > + * TODO: Triggered buffer support > + */ > + > +#include <linux/bitfield.h> > +#include <linux/delay.h> > +#include <linux/err.h> > +#include <linux/i2c.h> > +#include <linux/init.h> > +#include <linux/interrupt.h> > +#include <linux/irq.h> > +#include <linux/module.h> > +#include <linux/mutex.h> > +#include <linux/regmap.h> > + > +#include <linux/iio/iio.h> > +#include <linux/iio/sysfs.h> > +#include <linux/iio/events.h> > + > +#define ADUX1020_REGMAP_NAME "adux1020_regmap" > +#define ADUX1020_DRV_NAME "adux1020" > + > +/* System registers */ > +#define ADUX1020_REG_CHIP_ID 0x08 > +#define ADUX1020_REG_SLAVE_ADDRESS 0x09 > + > +#define ADUX1020_REG_SW_RESET 0x0f > +#define ADUX1020_REG_INT_ENABLE 0x1c > +#define ADUX1020_REG_INT_POLARITY 0x1d > +#define ADUX1020_REG_PROX_TH_ON1 0x2a > +#define ADUX1020_REG_PROX_TH_OFF1 0x2b > +#define ADUX1020_REG_PROX_TYPE 0x2f > +#define ADUX1020_REG_TEST_MODES_3 0x32 > +#define ADUX1020_REG_FORCE_MODE 0x33 > +#define ADUX1020_REG_FREQUENCY 0x40 > +#define ADUX1020_REG_LED_CURRENT 0x41 > +#define ADUX1020_REG_OP_MODE 0x45 > +#define ADUX1020_REG_INT_MASK 0x48 > +#define ADUX1020_REG_INT_STATUS 0x49 > +#define ADUX1020_REG_DATA_BUFFER 0x60 > + > +/* Chip ID bits */ > +#define ADUX1020_CHIP_ID_MASK GENMASK(11, 0) > +#define ADUX1020_CHIP_ID 0x03fc > + > +#define ADUX1020_SW_RESET BIT(1) > +#define ADUX1020_FIFO_FLUSH BIT(15) > +#define ADUX1020_OP_MODE_MASK GENMASK(3, 0) > +#define ADUX1020_DATA_OUT_MODE_MASK GENMASK(7, 4) > +#define ADUX1020_DATA_OUT_PROX_I FIELD_PREP(ADUX1020_DATA_OUT_MODE_MASK, 1) > + > +#define ADUX1020_MODE_INT_MASK GENMASK(7, 0) > +#define ADUX1020_INT_ENABLE 0x2094 > +#define ADUX1020_INT_DISABLE 0x2090 > +#define ADUX1020_PROX_INT_ENABLE 0x00f0 > +#define ADUX1020_PROX_ON1_INT BIT(0) > +#define ADUX1020_PROX_OFF1_INT BIT(1) > +#define ADUX1020_FIFO_INT_ENABLE 0x7f > +#define ADUX1020_MODE_INT_DISABLE 0xff > +#define ADUX1020_MODE_INT_STATUS_MASK GENMASK(7, 0) > +#define ADUX1020_FIFO_STATUS_MASK GENMASK(15, 8) > +#define ADUX1020_INT_CLEAR 0xff > +#define ADUX1020_PROX_TYPE BIT(15) > + > +#define ADUX1020_INT_PROX_ON1 BIT(0) > +#define ADUX1020_INT_PROX_OFF1 BIT(1) > + > +#define ADUX1020_FORCE_CLOCK_ON 0x0f4f > +#define ADUX1020_FORCE_CLOCK_RESET 0x0040 > +#define ADUX1020_ACTIVE_4_STATE 0x0008 > + > +#define ADUX1020_PROX_FREQ_MASK GENMASK(7, 4) > +#define ADUX1020_PROX_FREQ(x) FIELD_PREP(ADUX1020_PROX_FREQ_MASK, x) > + > +#define ADUX1020_LED_CURRENT_MASK GENMASK(3, 0) > +#define ADUX1020_LED_PIREF_EN BIT(12) > + > +/* Operating modes */ > +enum adux1020_op_modes { > + ADUX1020_MODE_STANDBY, > + ADUX1020_MODE_PROX_I, > + ADUX1020_MODE_PROX_XY, > + ADUX1020_MODE_GEST, > + ADUX1020_MODE_SAMPLE, > + ADUX1020_MODE_FORCE = 0x0e, > + ADUX1020_MODE_IDLE = 0x0f, > +}; > + > +struct adux1020_data { > + struct i2c_client *client; > + struct iio_dev *indio_dev; > + struct mutex lock; > + struct regmap *regmap; > +}; > + > +struct adux1020_mode_data { > + u8 bytes; > + u8 buf_len; > + u16 int_en; > +}; > + > +static const struct adux1020_mode_data adux1020_modes[] = { > + [ADUX1020_MODE_PROX_I] = { > + .bytes = 2, > + .buf_len = 1, > + .int_en = ADUX1020_PROX_INT_ENABLE, > + }, > +}; > + > +static const struct regmap_config adux1020_regmap_config = { > + .name = ADUX1020_REGMAP_NAME, > + .reg_bits = 8, > + .val_bits = 16, > + .max_register = 0x6F, > + .cache_type = REGCACHE_NONE, > +}; > + > +static const struct reg_sequence adux1020_def_conf[] = { > + { 0x000c, 0x000f }, > + { 0x0010, 0x1010 }, > + { 0x0011, 0x004c }, > + { 0x0012, 0x5f0c }, > + { 0x0013, 0xada5 }, > + { 0x0014, 0x0080 }, > + { 0x0015, 0x0000 }, > + { 0x0016, 0x0600 }, > + { 0x0017, 0x0000 }, > + { 0x0018, 0x2693 }, > + { 0x0019, 0x0004 }, > + { 0x001a, 0x4280 }, > + { 0x001b, 0x0060 }, > + { 0x001c, 0x2094 }, > + { 0x001d, 0x0020 }, > + { 0x001e, 0x0001 }, > + { 0x001f, 0x0100 }, > + { 0x0020, 0x0320 }, > + { 0x0021, 0x0A13 }, > + { 0x0022, 0x0320 }, > + { 0x0023, 0x0113 }, > + { 0x0024, 0x0000 }, > + { 0x0025, 0x2412 }, > + { 0x0026, 0x2412 }, > + { 0x0027, 0x0022 }, > + { 0x0028, 0x0000 }, > + { 0x0029, 0x0300 }, > + { 0x002a, 0x0700 }, > + { 0x002b, 0x0600 }, > + { 0x002c, 0x6000 }, > + { 0x002d, 0x4000 }, > + { 0x002e, 0x0000 }, > + { 0x002f, 0x0000 }, > + { 0x0030, 0x0000 }, > + { 0x0031, 0x0000 }, > + { 0x0032, 0x0040 }, > + { 0x0033, 0x0008 }, > + { 0x0034, 0xE400 }, > + { 0x0038, 0x8080 }, > + { 0x0039, 0x8080 }, > + { 0x003a, 0x2000 }, > + { 0x003b, 0x1f00 }, > + { 0x003c, 0x2000 }, > + { 0x003d, 0x2000 }, > + { 0x003e, 0x0000 }, > + { 0x0040, 0x8069 }, > + { 0x0041, 0x1f2f }, > + { 0x0042, 0x4000 }, > + { 0x0043, 0x0000 }, > + { 0x0044, 0x0008 }, > + { 0x0046, 0x0000 }, > + { 0x0048, 0x00ef }, > + { 0x0049, 0x0000 }, > + { 0x0045, 0x0000 }, > +}; > + > +static const int adux1020_rates[][2] = { > + { 0, 100000 }, > + { 0, 200000 }, > + { 0, 500000 }, > + { 1, 0 }, > + { 2, 0 }, > + { 5, 0 }, > + { 10, 0 }, > + { 20, 0 }, > + { 50, 0 }, > + { 100, 0 }, > + { 190, 0 }, > + { 450, 0 }, > + { 820, 0 }, > + { 1400, 0 }, > +}; > + > +static const int adux1020_led_currents[][2] = { > + { 0, 25000 }, > + { 0, 40000 }, > + { 0, 55000 }, > + { 0, 70000 }, > + { 0, 85000 }, > + { 0, 100000 }, > + { 0, 115000 }, > + { 0, 130000 }, > + { 0, 145000 }, > + { 0, 160000 }, > + { 0, 175000 }, > + { 0, 190000 }, > + { 0, 205000 }, > + { 0, 220000 }, > + { 0, 235000 }, > + { 0, 250000 }, > +}; > + > +static int adux1020_flush_fifo(struct adux1020_data *data) > +{ > + int ret; > + > + /* Force Idle mode */ > + ret = regmap_write(data->regmap, ADUX1020_REG_FORCE_MODE, > + ADUX1020_ACTIVE_4_STATE); > + if (ret < 0) > + return ret; > + > + ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_FORCE); > + if (ret < 0) > + return ret; > + > + ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_IDLE); > + if (ret < 0) > + return ret; > + > + /* Flush FIFO */ > + ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > + ADUX1020_FORCE_CLOCK_ON); > + if (ret < 0) > + return ret; > + > + ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, > + ADUX1020_FIFO_FLUSH); > + if (ret < 0) > + return ret; > + > + return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > + ADUX1020_FORCE_CLOCK_RESET); > +} > + > +static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len) > +{ > + unsigned int regval; > + int i, ret; > + > + /* Enable 32MHz clock */ > + ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > + ADUX1020_FORCE_CLOCK_ON); > + if (ret < 0) > + return ret; > + > + for (i = 0; i < buf_len; i++) { > + ret = regmap_read(data->regmap, ADUX1020_REG_DATA_BUFFER, > + ®val); > + if (ret < 0) > + return ret; > + > + buf[i] = regval; > + } > + > + /* Set 32MHz clock to be controlled by internal state machine */ > + return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > + ADUX1020_FORCE_CLOCK_RESET); > +} > + > +static int adux1020_set_mode(struct adux1020_data *data, > + enum adux1020_op_modes mode) > +{ > + int ret; > + > + /* Switch to standby mode before changing the mode */ > + ret = regmap_write(data->regmap, ADUX1020_REG_OP_MODE, > + ADUX1020_MODE_STANDBY); > + if (ret < 0) > + return ret; > + > + /* Set data out and switch to the desired mode */ > + switch (mode) { > + case ADUX1020_MODE_PROX_I: > + ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > + ADUX1020_DATA_OUT_MODE_MASK, > + ADUX1020_DATA_OUT_PROX_I); > + if (ret < 0) > + return ret; > + > + ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > + ADUX1020_OP_MODE_MASK, > + ADUX1020_MODE_PROX_I); > + if (ret < 0) > + return ret; > + break; > + default: > + return -EINVAL; > + } > + > + return 0; > +} > + > +static int adux1020_measure(struct adux1020_data *data, > + enum adux1020_op_modes mode, > + u16 *val) > +{ > + unsigned int status; > + int ret, tries = 50; > + > + /* Disable INT pin as polling is going to be used */ > + ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, > + ADUX1020_INT_DISABLE); > + if (ret < 0) > + return ret; > + > + /* Enable mode interrupt */ > + ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > + ADUX1020_MODE_INT_MASK, > + adux1020_modes[mode].int_en); > + if (ret < 0) > + return ret; > + > + while (tries--) { > + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, > + &status); > + if (ret < 0) > + return ret; > + > + status &= ADUX1020_FIFO_STATUS_MASK; > + if (status >= adux1020_modes[mode].bytes) > + break; > + msleep(20); > + } > + > + if (tries < 0) > + return -EIO; > + > + ret = adux1020_read_fifo(data, val, adux1020_modes[mode].buf_len); > + if (ret < 0) > + return ret; > + > + /* Clear mode interrupt */ > + ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, > + (~adux1020_modes[mode].int_en)); > + if (ret < 0) > + return ret; > + > + /* Disable mode interrupts */ > + return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > + ADUX1020_MODE_INT_MASK, > + ADUX1020_MODE_INT_DISABLE); > +} > + > +static int adux1020_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + struct adux1020_data *data = iio_priv(indio_dev); > + u16 buf[3]; > + int ret = -EINVAL; > + unsigned int regval; > + > + mutex_lock(&data->lock); > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + switch (chan->type) { > + case IIO_PROXIMITY: > + ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I); > + if (ret < 0) > + goto fail; > + > + ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf); > + if (ret < 0) > + goto fail; > + > + *val = buf[0]; > + ret = IIO_VAL_INT; > + break; > + default: > + break; > + } > + break; > + case IIO_CHAN_INFO_PROCESSED: > + switch (chan->type) { > + case IIO_CURRENT: > + ret = regmap_read(data->regmap, > + ADUX1020_REG_LED_CURRENT, ®val); > + if (ret < 0) > + goto fail; > + > + regval = regval & ADUX1020_LED_CURRENT_MASK; > + > + *val = adux1020_led_currents[regval][0]; > + *val2 = adux1020_led_currents[regval][1]; > + > + ret = IIO_VAL_INT_PLUS_MICRO; > + break; > + default: > + break; > + } > + break; > + case IIO_CHAN_INFO_SAMP_FREQ: > + switch (chan->type) { > + case IIO_PROXIMITY: > + ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY, > + ®val); > + if (ret < 0) > + goto fail; > + > + regval = FIELD_GET(ADUX1020_PROX_FREQ_MASK, regval); > + > + *val = adux1020_rates[regval][0]; > + *val2 = adux1020_rates[regval][1]; > + > + ret = IIO_VAL_INT_PLUS_MICRO; > + break; > + default: > + break; > + } > + break; > + default: > + break; > + } > + > +fail: > + mutex_unlock(&data->lock); > + > + return ret; > +}; > + > +static inline int adux1020_find_index(const int array[][2], int count, int val, > + int val2) > +{ > + int i; > + > + for (i = 0; i < count; i++) > + if (val == array[i][0] && val2 == array[i][1]) > + return i; > + > + return -EINVAL; > +} > + > +static int adux1020_write_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int val, int val2, long mask) > +{ > + struct adux1020_data *data = iio_priv(indio_dev); > + int i, ret = -EINVAL; > + > + mutex_lock(&data->lock); > + > + switch (mask) { > + case IIO_CHAN_INFO_SAMP_FREQ: > + if (chan->type == IIO_PROXIMITY) { > + i = adux1020_find_index(adux1020_rates, > + ARRAY_SIZE(adux1020_rates), > + val, val2); > + if (i < 0) { > + ret = i; > + goto fail; > + } > + > + ret = regmap_update_bits(data->regmap, > + ADUX1020_REG_FREQUENCY, > + ADUX1020_PROX_FREQ_MASK, > + ADUX1020_PROX_FREQ(i)); > + } > + break; > + case IIO_CHAN_INFO_PROCESSED: > + if (chan->type == IIO_CURRENT) { > + i = adux1020_find_index(adux1020_led_currents, > + ARRAY_SIZE(adux1020_led_currents), > + val, val2); > + if (i < 0) { > + ret = i; > + goto fail; > + } > + > + ret = regmap_update_bits(data->regmap, > + ADUX1020_REG_LED_CURRENT, > + ADUX1020_LED_CURRENT_MASK, i); > + } > + break; > + default: > + break; > + } > + > +fail: > + mutex_unlock(&data->lock); > + > + return ret; > +} > + > +static int adux1020_write_event_config(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan, > + enum iio_event_type type, > + enum iio_event_direction dir, int state) > +{ > + struct adux1020_data *data = iio_priv(indio_dev); > + int ret, mask; > + > + mutex_lock(&data->lock); > + > + ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, > + ADUX1020_INT_ENABLE); > + if (ret < 0) > + goto fail; > + > + ret = regmap_write(data->regmap, ADUX1020_REG_INT_POLARITY, 0); > + if (ret < 0) > + goto fail; > + > + switch (chan->type) { > + case IIO_PROXIMITY: > + if (dir == IIO_EV_DIR_RISING) > + mask = ADUX1020_PROX_ON1_INT; > + else > + mask = ADUX1020_PROX_OFF1_INT; > + > + if (state) > + state = 0; > + else > + state = mask; > + > + ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > + mask, state); > + if (ret < 0) > + goto fail; > + > + /* > + * Trigger proximity interrupt when the intensity is above > + * or below threshold > + */ > + ret = regmap_update_bits(data->regmap, ADUX1020_REG_PROX_TYPE, > + ADUX1020_PROX_TYPE, > + ADUX1020_PROX_TYPE); > + if (ret < 0) > + goto fail; > + > + /* Set proximity mode */ > + ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I); > + break; > + default: > + ret = -EINVAL; > + break; > + } > + > +fail: > + mutex_unlock(&data->lock); > + > + return ret; > +} > + > +static int adux1020_read_event_config(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan, > + enum iio_event_type type, > + enum iio_event_direction dir) > +{ > + struct adux1020_data *data = iio_priv(indio_dev); > + int ret, mask; > + unsigned int regval; > + > + switch (chan->type) { > + case IIO_PROXIMITY: > + if (dir == IIO_EV_DIR_RISING) > + mask = ADUX1020_PROX_ON1_INT; > + else > + mask = ADUX1020_PROX_OFF1_INT; > + break; > + default: > + return -EINVAL; > + } > + > + ret = regmap_read(data->regmap, ADUX1020_REG_INT_MASK, ®val); > + if (ret < 0) > + return ret; > + > + return !(regval & mask); > +} > + > +static int adux1020_read_thresh(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan, > + enum iio_event_type type, > + enum iio_event_direction dir, > + enum iio_event_info info, int *val, int *val2) > +{ > + struct adux1020_data *data = iio_priv(indio_dev); > + u8 reg; > + int ret; > + unsigned int regval; > + > + switch (chan->type) { > + case IIO_PROXIMITY: > + if (dir == IIO_EV_DIR_RISING) > + reg = ADUX1020_REG_PROX_TH_ON1; > + else > + reg = ADUX1020_REG_PROX_TH_OFF1; > + break; > + default: > + return -EINVAL; > + } > + > + ret = regmap_read(data->regmap, reg, ®val); > + if (ret < 0) > + return ret; > + > + *val = regval; > + > + return IIO_VAL_INT; > +} > + > +static int adux1020_write_thresh(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan, > + enum iio_event_type type, > + enum iio_event_direction dir, > + enum iio_event_info info, int val, int val2) > +{ > + struct adux1020_data *data = iio_priv(indio_dev); > + u8 reg; > + > + switch (chan->type) { > + case IIO_PROXIMITY: > + if (dir == IIO_EV_DIR_RISING) > + reg = ADUX1020_REG_PROX_TH_ON1; > + else > + reg = ADUX1020_REG_PROX_TH_OFF1; > + break; > + default: > + return -EINVAL; > + } > + > + /* Full scale threshold value is 0-65535 */ > + if (val < 0 || val > 65535) > + return -EINVAL; > + > + return regmap_write(data->regmap, reg, val); > +} > + > +static const struct iio_event_spec adux1020_proximity_event[] = { > + { > + .type = IIO_EV_TYPE_THRESH, > + .dir = IIO_EV_DIR_RISING, > + .mask_separate = BIT(IIO_EV_INFO_VALUE) | > + BIT(IIO_EV_INFO_ENABLE), > + }, > + { > + .type = IIO_EV_TYPE_THRESH, > + .dir = IIO_EV_DIR_FALLING, > + .mask_separate = BIT(IIO_EV_INFO_VALUE) | > + BIT(IIO_EV_INFO_ENABLE), > + }, > +}; > + > +static const struct iio_chan_spec adux1020_channels[] = { > + { > + .type = IIO_PROXIMITY, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > + BIT(IIO_CHAN_INFO_SAMP_FREQ), > + .event_spec = adux1020_proximity_event, > + .num_event_specs = ARRAY_SIZE(adux1020_proximity_event), > + }, > + { > + .type = IIO_CURRENT, > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), > + .extend_name = "led", > + .output = 1, > + }, > +}; > + > +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( > + "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400"); > + > +static struct attribute *adux1020_attributes[] = { > + &iio_const_attr_sampling_frequency_available.dev_attr.attr, > + NULL > +}; > + > +static const struct attribute_group adux1020_attribute_group = { > + .attrs = adux1020_attributes, > +}; > + > +static const struct iio_info adux1020_info = { > + .attrs = &adux1020_attribute_group, > + .read_raw = adux1020_read_raw, > + .write_raw = adux1020_write_raw, > + .read_event_config = adux1020_read_event_config, > + .write_event_config = adux1020_write_event_config, > + .read_event_value = adux1020_read_thresh, > + .write_event_value = adux1020_write_thresh, > +}; > + > +static irqreturn_t adux1020_interrupt_handler(int irq, void *private) > +{ > + struct iio_dev *indio_dev = private; > + struct adux1020_data *data = iio_priv(indio_dev); > + int ret, status; > + > + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, &status); > + if (ret < 0) > + return IRQ_HANDLED; > + > + status &= ADUX1020_MODE_INT_STATUS_MASK; > + > + if (status & ADUX1020_INT_PROX_ON1) { > + iio_push_event(indio_dev, > + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, > + IIO_EV_TYPE_THRESH, > + IIO_EV_DIR_RISING), > + iio_get_time_ns(indio_dev)); > + } > + > + if (status & ADUX1020_INT_PROX_OFF1) { > + iio_push_event(indio_dev, > + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, > + IIO_EV_TYPE_THRESH, > + IIO_EV_DIR_FALLING), > + iio_get_time_ns(indio_dev)); > + } > + > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_STATUS, > + ADUX1020_MODE_INT_MASK, ADUX1020_INT_CLEAR); > + > + return IRQ_HANDLED; > +} > + > +static int adux1020_chip_init(struct adux1020_data *data) > +{ > + struct i2c_client *client = data->client; > + int ret; > + unsigned int val; > + > + ret = regmap_read(data->regmap, ADUX1020_REG_CHIP_ID, &val); > + if (ret < 0) > + return ret; > + > + if ((val & ADUX1020_CHIP_ID_MASK) != ADUX1020_CHIP_ID) { > + dev_err(&client->dev, "invalid chip id 0x%04x\n", val); > + return -ENODEV; > + }; > + > + dev_dbg(&client->dev, "Detected ADUX1020 with chip id: 0x%04x\n", val); > + > + ret = regmap_update_bits(data->regmap, ADUX1020_REG_SW_RESET, > + ADUX1020_SW_RESET, ADUX1020_SW_RESET); > + if (ret < 0) > + return ret; > + > + /* Load default configuration */ > + ret = regmap_multi_reg_write(data->regmap, adux1020_def_conf, > + ARRAY_SIZE(adux1020_def_conf)); > + if (ret < 0) > + return ret; > + > + ret = adux1020_flush_fifo(data); > + if (ret < 0) > + return ret; > + > + /* Use LED_IREF for proximity mode */ > + ret = regmap_update_bits(data->regmap, ADUX1020_REG_LED_CURRENT, > + ADUX1020_LED_PIREF_EN, 0); > + if (ret < 0) > + return ret; > + > + /* Mask all interrupts */ > + return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > + ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE); > +} > + > +static int adux1020_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct adux1020_data *data; > + struct iio_dev *indio_dev; > + int ret; > + > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > + if (!indio_dev) > + return -ENOMEM; > + > + indio_dev->dev.parent = &client->dev; > + indio_dev->info = &adux1020_info; > + indio_dev->name = ADUX1020_DRV_NAME; > + indio_dev->channels = adux1020_channels; > + indio_dev->num_channels = ARRAY_SIZE(adux1020_channels); > + indio_dev->modes = INDIO_DIRECT_MODE; > + > + data = iio_priv(indio_dev); > + > + data->regmap = devm_regmap_init_i2c(client, &adux1020_regmap_config); > + if (IS_ERR(data->regmap)) { > + dev_err(&client->dev, "regmap initialization failed.\n"); > + return PTR_ERR(data->regmap); > + } > + > + data->client = client; > + data->indio_dev = indio_dev; > + mutex_init(&data->lock); > + > + ret = adux1020_chip_init(data); > + if (ret) > + return ret; > + > + if (client->irq) { > + ret = devm_request_threaded_irq(&client->dev, client->irq, > + NULL, adux1020_interrupt_handler, > + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, > + ADUX1020_DRV_NAME, indio_dev); > + if (ret) { > + dev_err(&client->dev, "irq request error %d\n", -ret); > + return ret; > + } > + } > + > + return devm_iio_device_register(&client->dev, indio_dev); > +} > + > +static const struct i2c_device_id adux1020_id[] = { > + { "adux1020", 0 }, > + {} > +}; > +MODULE_DEVICE_TABLE(i2c, adux1020_id); > + > +static const struct of_device_id adux1020_of_match[] = { > + { .compatible = "adi,adux1020" }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, adux1020_of_match); > + > +static struct i2c_driver adux1020_driver = { > + .driver = { > + .name = ADUX1020_DRV_NAME, > + .of_match_table = adux1020_of_match, > + }, > + .probe = adux1020_probe, > + .id_table = adux1020_id, > +}; > +module_i2c_driver(adux1020_driver); > + > +MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>"); > +MODULE_DESCRIPTION("ADUX1020 photometric sensor"); > +MODULE_LICENSE("GPL");
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 08d7e1ef2186..3f8c8689cd89 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -32,6 +32,17 @@ config ADJD_S311 This driver can also be built as a module. If so, the module will be called adjd_s311. +config ADUX1020 + tristate "ADUX1020 photometric sensor" + select REGMAP_I2C + depends on I2C + help + Say Y here if you want to build a driver for the Analog Devices + ADUX1020 photometric sensor. + + To compile this driver as a module, choose M here: the + module will be called adux1020. + config AL3320A tristate "AL3320A ambient light sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index 00d1f9b98f39..5d650ce46a40 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -6,6 +6,7 @@ # When adding new entries keep the list in alphabetical order obj-$(CONFIG_ACPI_ALS) += acpi-als.o obj-$(CONFIG_ADJD_S311) += adjd_s311.o +obj-$(CONFIG_ADUX1020) += adux1020.o obj-$(CONFIG_AL3320A) += al3320a.o obj-$(CONFIG_APDS9300) += apds9300.o obj-$(CONFIG_APDS9960) += apds9960.o diff --git a/drivers/iio/light/adux1020.c b/drivers/iio/light/adux1020.c new file mode 100644 index 000000000000..830e5e95d58f --- /dev/null +++ b/drivers/iio/light/adux1020.c @@ -0,0 +1,849 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor + * + * Copyright (C) 2019 Linaro Ltd. + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> + * + * TODO: Triggered buffer support + */ + +#include <linux/bitfield.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/regmap.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/events.h> + +#define ADUX1020_REGMAP_NAME "adux1020_regmap" +#define ADUX1020_DRV_NAME "adux1020" + +/* System registers */ +#define ADUX1020_REG_CHIP_ID 0x08 +#define ADUX1020_REG_SLAVE_ADDRESS 0x09 + +#define ADUX1020_REG_SW_RESET 0x0f +#define ADUX1020_REG_INT_ENABLE 0x1c +#define ADUX1020_REG_INT_POLARITY 0x1d +#define ADUX1020_REG_PROX_TH_ON1 0x2a +#define ADUX1020_REG_PROX_TH_OFF1 0x2b +#define ADUX1020_REG_PROX_TYPE 0x2f +#define ADUX1020_REG_TEST_MODES_3 0x32 +#define ADUX1020_REG_FORCE_MODE 0x33 +#define ADUX1020_REG_FREQUENCY 0x40 +#define ADUX1020_REG_LED_CURRENT 0x41 +#define ADUX1020_REG_OP_MODE 0x45 +#define ADUX1020_REG_INT_MASK 0x48 +#define ADUX1020_REG_INT_STATUS 0x49 +#define ADUX1020_REG_DATA_BUFFER 0x60 + +/* Chip ID bits */ +#define ADUX1020_CHIP_ID_MASK GENMASK(11, 0) +#define ADUX1020_CHIP_ID 0x03fc + +#define ADUX1020_SW_RESET BIT(1) +#define ADUX1020_FIFO_FLUSH BIT(15) +#define ADUX1020_OP_MODE_MASK GENMASK(3, 0) +#define ADUX1020_DATA_OUT_MODE_MASK GENMASK(7, 4) +#define ADUX1020_DATA_OUT_PROX_I FIELD_PREP(ADUX1020_DATA_OUT_MODE_MASK, 1) + +#define ADUX1020_MODE_INT_MASK GENMASK(7, 0) +#define ADUX1020_INT_ENABLE 0x2094 +#define ADUX1020_INT_DISABLE 0x2090 +#define ADUX1020_PROX_INT_ENABLE 0x00f0 +#define ADUX1020_PROX_ON1_INT BIT(0) +#define ADUX1020_PROX_OFF1_INT BIT(1) +#define ADUX1020_FIFO_INT_ENABLE 0x7f +#define ADUX1020_MODE_INT_DISABLE 0xff +#define ADUX1020_MODE_INT_STATUS_MASK GENMASK(7, 0) +#define ADUX1020_FIFO_STATUS_MASK GENMASK(15, 8) +#define ADUX1020_INT_CLEAR 0xff +#define ADUX1020_PROX_TYPE BIT(15) + +#define ADUX1020_INT_PROX_ON1 BIT(0) +#define ADUX1020_INT_PROX_OFF1 BIT(1) + +#define ADUX1020_FORCE_CLOCK_ON 0x0f4f +#define ADUX1020_FORCE_CLOCK_RESET 0x0040 +#define ADUX1020_ACTIVE_4_STATE 0x0008 + +#define ADUX1020_PROX_FREQ_MASK GENMASK(7, 4) +#define ADUX1020_PROX_FREQ(x) FIELD_PREP(ADUX1020_PROX_FREQ_MASK, x) + +#define ADUX1020_LED_CURRENT_MASK GENMASK(3, 0) +#define ADUX1020_LED_PIREF_EN BIT(12) + +/* Operating modes */ +enum adux1020_op_modes { + ADUX1020_MODE_STANDBY, + ADUX1020_MODE_PROX_I, + ADUX1020_MODE_PROX_XY, + ADUX1020_MODE_GEST, + ADUX1020_MODE_SAMPLE, + ADUX1020_MODE_FORCE = 0x0e, + ADUX1020_MODE_IDLE = 0x0f, +}; + +struct adux1020_data { + struct i2c_client *client; + struct iio_dev *indio_dev; + struct mutex lock; + struct regmap *regmap; +}; + +struct adux1020_mode_data { + u8 bytes; + u8 buf_len; + u16 int_en; +}; + +static const struct adux1020_mode_data adux1020_modes[] = { + [ADUX1020_MODE_PROX_I] = { + .bytes = 2, + .buf_len = 1, + .int_en = ADUX1020_PROX_INT_ENABLE, + }, +}; + +static const struct regmap_config adux1020_regmap_config = { + .name = ADUX1020_REGMAP_NAME, + .reg_bits = 8, + .val_bits = 16, + .max_register = 0x6F, + .cache_type = REGCACHE_NONE, +}; + +static const struct reg_sequence adux1020_def_conf[] = { + { 0x000c, 0x000f }, + { 0x0010, 0x1010 }, + { 0x0011, 0x004c }, + { 0x0012, 0x5f0c }, + { 0x0013, 0xada5 }, + { 0x0014, 0x0080 }, + { 0x0015, 0x0000 }, + { 0x0016, 0x0600 }, + { 0x0017, 0x0000 }, + { 0x0018, 0x2693 }, + { 0x0019, 0x0004 }, + { 0x001a, 0x4280 }, + { 0x001b, 0x0060 }, + { 0x001c, 0x2094 }, + { 0x001d, 0x0020 }, + { 0x001e, 0x0001 }, + { 0x001f, 0x0100 }, + { 0x0020, 0x0320 }, + { 0x0021, 0x0A13 }, + { 0x0022, 0x0320 }, + { 0x0023, 0x0113 }, + { 0x0024, 0x0000 }, + { 0x0025, 0x2412 }, + { 0x0026, 0x2412 }, + { 0x0027, 0x0022 }, + { 0x0028, 0x0000 }, + { 0x0029, 0x0300 }, + { 0x002a, 0x0700 }, + { 0x002b, 0x0600 }, + { 0x002c, 0x6000 }, + { 0x002d, 0x4000 }, + { 0x002e, 0x0000 }, + { 0x002f, 0x0000 }, + { 0x0030, 0x0000 }, + { 0x0031, 0x0000 }, + { 0x0032, 0x0040 }, + { 0x0033, 0x0008 }, + { 0x0034, 0xE400 }, + { 0x0038, 0x8080 }, + { 0x0039, 0x8080 }, + { 0x003a, 0x2000 }, + { 0x003b, 0x1f00 }, + { 0x003c, 0x2000 }, + { 0x003d, 0x2000 }, + { 0x003e, 0x0000 }, + { 0x0040, 0x8069 }, + { 0x0041, 0x1f2f }, + { 0x0042, 0x4000 }, + { 0x0043, 0x0000 }, + { 0x0044, 0x0008 }, + { 0x0046, 0x0000 }, + { 0x0048, 0x00ef }, + { 0x0049, 0x0000 }, + { 0x0045, 0x0000 }, +}; + +static const int adux1020_rates[][2] = { + { 0, 100000 }, + { 0, 200000 }, + { 0, 500000 }, + { 1, 0 }, + { 2, 0 }, + { 5, 0 }, + { 10, 0 }, + { 20, 0 }, + { 50, 0 }, + { 100, 0 }, + { 190, 0 }, + { 450, 0 }, + { 820, 0 }, + { 1400, 0 }, +}; + +static const int adux1020_led_currents[][2] = { + { 0, 25000 }, + { 0, 40000 }, + { 0, 55000 }, + { 0, 70000 }, + { 0, 85000 }, + { 0, 100000 }, + { 0, 115000 }, + { 0, 130000 }, + { 0, 145000 }, + { 0, 160000 }, + { 0, 175000 }, + { 0, 190000 }, + { 0, 205000 }, + { 0, 220000 }, + { 0, 235000 }, + { 0, 250000 }, +}; + +static int adux1020_flush_fifo(struct adux1020_data *data) +{ + int ret; + + /* Force Idle mode */ + ret = regmap_write(data->regmap, ADUX1020_REG_FORCE_MODE, + ADUX1020_ACTIVE_4_STATE); + if (ret < 0) + return ret; + + ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_FORCE); + if (ret < 0) + return ret; + + ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_IDLE); + if (ret < 0) + return ret; + + /* Flush FIFO */ + ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, + ADUX1020_FORCE_CLOCK_ON); + if (ret < 0) + return ret; + + ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, + ADUX1020_FIFO_FLUSH); + if (ret < 0) + return ret; + + return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, + ADUX1020_FORCE_CLOCK_RESET); +} + +static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len) +{ + unsigned int regval; + int i, ret; + + /* Enable 32MHz clock */ + ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, + ADUX1020_FORCE_CLOCK_ON); + if (ret < 0) + return ret; + + for (i = 0; i < buf_len; i++) { + ret = regmap_read(data->regmap, ADUX1020_REG_DATA_BUFFER, + ®val); + if (ret < 0) + return ret; + + buf[i] = regval; + } + + /* Set 32MHz clock to be controlled by internal state machine */ + return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, + ADUX1020_FORCE_CLOCK_RESET); +} + +static int adux1020_set_mode(struct adux1020_data *data, + enum adux1020_op_modes mode) +{ + int ret; + + /* Switch to standby mode before changing the mode */ + ret = regmap_write(data->regmap, ADUX1020_REG_OP_MODE, + ADUX1020_MODE_STANDBY); + if (ret < 0) + return ret; + + /* Set data out and switch to the desired mode */ + switch (mode) { + case ADUX1020_MODE_PROX_I: + ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, + ADUX1020_DATA_OUT_MODE_MASK, + ADUX1020_DATA_OUT_PROX_I); + if (ret < 0) + return ret; + + ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, + ADUX1020_OP_MODE_MASK, + ADUX1020_MODE_PROX_I); + if (ret < 0) + return ret; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int adux1020_measure(struct adux1020_data *data, + enum adux1020_op_modes mode, + u16 *val) +{ + unsigned int status; + int ret, tries = 50; + + /* Disable INT pin as polling is going to be used */ + ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, + ADUX1020_INT_DISABLE); + if (ret < 0) + return ret; + + /* Enable mode interrupt */ + ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, + ADUX1020_MODE_INT_MASK, + adux1020_modes[mode].int_en); + if (ret < 0) + return ret; + + while (tries--) { + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, + &status); + if (ret < 0) + return ret; + + status &= ADUX1020_FIFO_STATUS_MASK; + if (status >= adux1020_modes[mode].bytes) + break; + msleep(20); + } + + if (tries < 0) + return -EIO; + + ret = adux1020_read_fifo(data, val, adux1020_modes[mode].buf_len); + if (ret < 0) + return ret; + + /* Clear mode interrupt */ + ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, + (~adux1020_modes[mode].int_en)); + if (ret < 0) + return ret; + + /* Disable mode interrupts */ + return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, + ADUX1020_MODE_INT_MASK, + ADUX1020_MODE_INT_DISABLE); +} + +static int adux1020_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct adux1020_data *data = iio_priv(indio_dev); + u16 buf[3]; + int ret = -EINVAL; + unsigned int regval; + + mutex_lock(&data->lock); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_PROXIMITY: + ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I); + if (ret < 0) + goto fail; + + ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf); + if (ret < 0) + goto fail; + + *val = buf[0]; + ret = IIO_VAL_INT; + break; + default: + break; + } + break; + case IIO_CHAN_INFO_PROCESSED: + switch (chan->type) { + case IIO_CURRENT: + ret = regmap_read(data->regmap, + ADUX1020_REG_LED_CURRENT, ®val); + if (ret < 0) + goto fail; + + regval = regval & ADUX1020_LED_CURRENT_MASK; + + *val = adux1020_led_currents[regval][0]; + *val2 = adux1020_led_currents[regval][1]; + + ret = IIO_VAL_INT_PLUS_MICRO; + break; + default: + break; + } + break; + case IIO_CHAN_INFO_SAMP_FREQ: + switch (chan->type) { + case IIO_PROXIMITY: + ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY, + ®val); + if (ret < 0) + goto fail; + + regval = FIELD_GET(ADUX1020_PROX_FREQ_MASK, regval); + + *val = adux1020_rates[regval][0]; + *val2 = adux1020_rates[regval][1]; + + ret = IIO_VAL_INT_PLUS_MICRO; + break; + default: + break; + } + break; + default: + break; + } + +fail: + mutex_unlock(&data->lock); + + return ret; +}; + +static inline int adux1020_find_index(const int array[][2], int count, int val, + int val2) +{ + int i; + + for (i = 0; i < count; i++) + if (val == array[i][0] && val2 == array[i][1]) + return i; + + return -EINVAL; +} + +static int adux1020_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct adux1020_data *data = iio_priv(indio_dev); + int i, ret = -EINVAL; + + mutex_lock(&data->lock); + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + if (chan->type == IIO_PROXIMITY) { + i = adux1020_find_index(adux1020_rates, + ARRAY_SIZE(adux1020_rates), + val, val2); + if (i < 0) { + ret = i; + goto fail; + } + + ret = regmap_update_bits(data->regmap, + ADUX1020_REG_FREQUENCY, + ADUX1020_PROX_FREQ_MASK, + ADUX1020_PROX_FREQ(i)); + } + break; + case IIO_CHAN_INFO_PROCESSED: + if (chan->type == IIO_CURRENT) { + i = adux1020_find_index(adux1020_led_currents, + ARRAY_SIZE(adux1020_led_currents), + val, val2); + if (i < 0) { + ret = i; + goto fail; + } + + ret = regmap_update_bits(data->regmap, + ADUX1020_REG_LED_CURRENT, + ADUX1020_LED_CURRENT_MASK, i); + } + break; + default: + break; + } + +fail: + mutex_unlock(&data->lock); + + return ret; +} + +static int adux1020_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, int state) +{ + struct adux1020_data *data = iio_priv(indio_dev); + int ret, mask; + + mutex_lock(&data->lock); + + ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, + ADUX1020_INT_ENABLE); + if (ret < 0) + goto fail; + + ret = regmap_write(data->regmap, ADUX1020_REG_INT_POLARITY, 0); + if (ret < 0) + goto fail; + + switch (chan->type) { + case IIO_PROXIMITY: + if (dir == IIO_EV_DIR_RISING) + mask = ADUX1020_PROX_ON1_INT; + else + mask = ADUX1020_PROX_OFF1_INT; + + if (state) + state = 0; + else + state = mask; + + ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, + mask, state); + if (ret < 0) + goto fail; + + /* + * Trigger proximity interrupt when the intensity is above + * or below threshold + */ + ret = regmap_update_bits(data->regmap, ADUX1020_REG_PROX_TYPE, + ADUX1020_PROX_TYPE, + ADUX1020_PROX_TYPE); + if (ret < 0) + goto fail; + + /* Set proximity mode */ + ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I); + break; + default: + ret = -EINVAL; + break; + } + +fail: + mutex_unlock(&data->lock); + + return ret; +} + +static int adux1020_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct adux1020_data *data = iio_priv(indio_dev); + int ret, mask; + unsigned int regval; + + switch (chan->type) { + case IIO_PROXIMITY: + if (dir == IIO_EV_DIR_RISING) + mask = ADUX1020_PROX_ON1_INT; + else + mask = ADUX1020_PROX_OFF1_INT; + break; + default: + return -EINVAL; + } + + ret = regmap_read(data->regmap, ADUX1020_REG_INT_MASK, ®val); + if (ret < 0) + return ret; + + return !(regval & mask); +} + +static int adux1020_read_thresh(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, int *val, int *val2) +{ + struct adux1020_data *data = iio_priv(indio_dev); + u8 reg; + int ret; + unsigned int regval; + + switch (chan->type) { + case IIO_PROXIMITY: + if (dir == IIO_EV_DIR_RISING) + reg = ADUX1020_REG_PROX_TH_ON1; + else + reg = ADUX1020_REG_PROX_TH_OFF1; + break; + default: + return -EINVAL; + } + + ret = regmap_read(data->regmap, reg, ®val); + if (ret < 0) + return ret; + + *val = regval; + + return IIO_VAL_INT; +} + +static int adux1020_write_thresh(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, int val, int val2) +{ + struct adux1020_data *data = iio_priv(indio_dev); + u8 reg; + + switch (chan->type) { + case IIO_PROXIMITY: + if (dir == IIO_EV_DIR_RISING) + reg = ADUX1020_REG_PROX_TH_ON1; + else + reg = ADUX1020_REG_PROX_TH_OFF1; + break; + default: + return -EINVAL; + } + + /* Full scale threshold value is 0-65535 */ + if (val < 0 || val > 65535) + return -EINVAL; + + return regmap_write(data->regmap, reg, val); +} + +static const struct iio_event_spec adux1020_proximity_event[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, +}; + +static const struct iio_chan_spec adux1020_channels[] = { + { + .type = IIO_PROXIMITY, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SAMP_FREQ), + .event_spec = adux1020_proximity_event, + .num_event_specs = ARRAY_SIZE(adux1020_proximity_event), + }, + { + .type = IIO_CURRENT, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), + .extend_name = "led", + .output = 1, + }, +}; + +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( + "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400"); + +static struct attribute *adux1020_attributes[] = { + &iio_const_attr_sampling_frequency_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group adux1020_attribute_group = { + .attrs = adux1020_attributes, +}; + +static const struct iio_info adux1020_info = { + .attrs = &adux1020_attribute_group, + .read_raw = adux1020_read_raw, + .write_raw = adux1020_write_raw, + .read_event_config = adux1020_read_event_config, + .write_event_config = adux1020_write_event_config, + .read_event_value = adux1020_read_thresh, + .write_event_value = adux1020_write_thresh, +}; + +static irqreturn_t adux1020_interrupt_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct adux1020_data *data = iio_priv(indio_dev); + int ret, status; + + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, &status); + if (ret < 0) + return IRQ_HANDLED; + + status &= ADUX1020_MODE_INT_STATUS_MASK; + + if (status & ADUX1020_INT_PROX_ON1) { + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + iio_get_time_ns(indio_dev)); + } + + if (status & ADUX1020_INT_PROX_OFF1) { + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + iio_get_time_ns(indio_dev)); + } + + regmap_update_bits(data->regmap, ADUX1020_REG_INT_STATUS, + ADUX1020_MODE_INT_MASK, ADUX1020_INT_CLEAR); + + return IRQ_HANDLED; +} + +static int adux1020_chip_init(struct adux1020_data *data) +{ + struct i2c_client *client = data->client; + int ret; + unsigned int val; + + ret = regmap_read(data->regmap, ADUX1020_REG_CHIP_ID, &val); + if (ret < 0) + return ret; + + if ((val & ADUX1020_CHIP_ID_MASK) != ADUX1020_CHIP_ID) { + dev_err(&client->dev, "invalid chip id 0x%04x\n", val); + return -ENODEV; + }; + + dev_dbg(&client->dev, "Detected ADUX1020 with chip id: 0x%04x\n", val); + + ret = regmap_update_bits(data->regmap, ADUX1020_REG_SW_RESET, + ADUX1020_SW_RESET, ADUX1020_SW_RESET); + if (ret < 0) + return ret; + + /* Load default configuration */ + ret = regmap_multi_reg_write(data->regmap, adux1020_def_conf, + ARRAY_SIZE(adux1020_def_conf)); + if (ret < 0) + return ret; + + ret = adux1020_flush_fifo(data); + if (ret < 0) + return ret; + + /* Use LED_IREF for proximity mode */ + ret = regmap_update_bits(data->regmap, ADUX1020_REG_LED_CURRENT, + ADUX1020_LED_PIREF_EN, 0); + if (ret < 0) + return ret; + + /* Mask all interrupts */ + return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, + ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE); +} + +static int adux1020_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct adux1020_data *data; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + indio_dev->dev.parent = &client->dev; + indio_dev->info = &adux1020_info; + indio_dev->name = ADUX1020_DRV_NAME; + indio_dev->channels = adux1020_channels; + indio_dev->num_channels = ARRAY_SIZE(adux1020_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + data = iio_priv(indio_dev); + + data->regmap = devm_regmap_init_i2c(client, &adux1020_regmap_config); + if (IS_ERR(data->regmap)) { + dev_err(&client->dev, "regmap initialization failed.\n"); + return PTR_ERR(data->regmap); + } + + data->client = client; + data->indio_dev = indio_dev; + mutex_init(&data->lock); + + ret = adux1020_chip_init(data); + if (ret) + return ret; + + if (client->irq) { + ret = devm_request_threaded_irq(&client->dev, client->irq, + NULL, adux1020_interrupt_handler, + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, + ADUX1020_DRV_NAME, indio_dev); + if (ret) { + dev_err(&client->dev, "irq request error %d\n", -ret); + return ret; + } + } + + return devm_iio_device_register(&client->dev, indio_dev); +} + +static const struct i2c_device_id adux1020_id[] = { + { "adux1020", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, adux1020_id); + +static const struct of_device_id adux1020_of_match[] = { + { .compatible = "adi,adux1020" }, + { } +}; +MODULE_DEVICE_TABLE(of, adux1020_of_match); + +static struct i2c_driver adux1020_driver = { + .driver = { + .name = ADUX1020_DRV_NAME, + .of_match_table = adux1020_of_match, + }, + .probe = adux1020_probe, + .id_table = adux1020_id, +}; +module_i2c_driver(adux1020_driver); + +MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>"); +MODULE_DESCRIPTION("ADUX1020 photometric sensor"); +MODULE_LICENSE("GPL");
Add initial support for Analog Devices ADUX1020 Photometric sensor. Only proximity mode has been enabled for now. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> --- drivers/iio/light/Kconfig | 11 + drivers/iio/light/Makefile | 1 + drivers/iio/light/adux1020.c | 849 +++++++++++++++++++++++++++++++++++ 3 files changed, 861 insertions(+) create mode 100644 drivers/iio/light/adux1020.c