| Message ID | a745a4984a6aed6d55216156957bb7bd388d6451.1552700652.git.renatogeh@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | staging: iio: ad7780: move out of staging | expand |
On Fri, 15 Mar 2019 23:15:55 -0300 Renato Lui Geh <renatogeh@gmail.com> wrote: > Move ad7780 ADC driver out of staging and into the mainline. > > The ad7780 is a sigma-delta analog to digital converter. This driver provides > reading voltage values and status bits from both the ad778x and ad717x series. > Its interface also allows writing on the FILTER and GAIN GPIO pins on the > ad778x. > > Signed-off-by: Renato Lui Geh <renatogeh@gmail.com> > Signed-off-by: Giuliano Belinassi <giuliano.belinassi@usp.br> > Co-developed-by: Giuliano Belinassi <giuliano.belinassi@usp.br> Applied to the togreg branch of iio.git and pushed out as testing. Note I won't be pushing that out as non rebasing (togreg) until at least next weekend, so there is a bit of time for any last minute feedback etc. Thanks for all your hard work on this and great to see it graduate from staging! Thanks, Jonathan > --- > Changes in v3: > - Changes unrelated to moving the driver to main tree were resent as > individual patches > Changes in v4: > - Removed line warning it was safe to build the ad7780 driver by > default > > drivers/iio/adc/Kconfig | 12 + > drivers/iio/adc/Makefile | 1 + > drivers/iio/adc/ad7780.c | 376 +++++++++++++++++++++++++++++++ > drivers/staging/iio/adc/Kconfig | 13 -- > drivers/staging/iio/adc/Makefile | 1 - > drivers/staging/iio/adc/ad7780.c | 376 ------------------------------- > 6 files changed, 389 insertions(+), 390 deletions(-) > create mode 100644 drivers/iio/adc/ad7780.c > delete mode 100644 drivers/staging/iio/adc/ad7780.c > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > index f3cc7a31bce5..6b36a45bd09f 100644 > --- a/drivers/iio/adc/Kconfig > +++ b/drivers/iio/adc/Kconfig > @@ -108,6 +108,18 @@ config AD7766 > To compile this driver as a module, choose M here: the module will be > called ad7766. > > +config AD7780 > + tristate "Analog Devices AD7780 and similar ADCs driver" > + depends on SPI > + depends on GPIOLIB || COMPILE_TEST > + select AD_SIGMA_DELTA > + help > + Say yes here to build support for Analog Devices AD7170, AD7171, > + AD7780 and AD7781 SPI analog to digital converters (ADC). > + > + To compile this driver as a module, choose M here: the > + module will be called ad7780. > + > config AD7791 > tristate "Analog Devices AD7791 ADC driver" > depends on SPI > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > index ea5031348052..b48852157115 100644 > --- a/drivers/iio/adc/Makefile > +++ b/drivers/iio/adc/Makefile > @@ -15,6 +15,7 @@ obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o > obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o > obj-$(CONFIG_AD7606) += ad7606.o > obj-$(CONFIG_AD7766) += ad7766.o > +obj-$(CONFIG_AD7780) += ad7780.o > obj-$(CONFIG_AD7791) += ad7791.o > obj-$(CONFIG_AD7793) += ad7793.o > obj-$(CONFIG_AD7887) += ad7887.o > diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c > new file mode 100644 > index 000000000000..23b731a92e32 > --- /dev/null > +++ b/drivers/iio/adc/ad7780.c > @@ -0,0 +1,376 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver > + * > + * Copyright 2011 Analog Devices Inc. > + * Copyright 2019 Renato Lui Geh > + */ > + > +#include <linux/interrupt.h> > +#include <linux/device.h> > +#include <linux/kernel.h> > +#include <linux/slab.h> > +#include <linux/sysfs.h> > +#include <linux/spi/spi.h> > +#include <linux/regulator/consumer.h> > +#include <linux/err.h> > +#include <linux/sched.h> > +#include <linux/gpio/consumer.h> > +#include <linux/module.h> > +#include <linux/bits.h> > + > +#include <linux/iio/iio.h> > +#include <linux/iio/sysfs.h> > +#include <linux/iio/adc/ad_sigma_delta.h> > + > +#define AD7780_RDY BIT(7) > +#define AD7780_FILTER BIT(6) > +#define AD7780_ERR BIT(5) > +#define AD7780_ID1 BIT(4) > +#define AD7780_ID0 BIT(3) > +#define AD7780_GAIN BIT(2) > + > +#define AD7170_ID 0 > +#define AD7171_ID 1 > +#define AD7780_ID 1 > +#define AD7781_ID 0 > + > +#define AD7780_ID_MASK (AD7780_ID0 | AD7780_ID1) > + > +#define AD7780_PATTERN_GOOD 1 > +#define AD7780_PATTERN_MASK GENMASK(1, 0) > + > +#define AD7170_PATTERN_GOOD 5 > +#define AD7170_PATTERN_MASK GENMASK(2, 0) > + > +#define AD7780_GAIN_MIDPOINT 64 > +#define AD7780_FILTER_MIDPOINT 13350 > + > +static const unsigned int ad778x_gain[2] = { 1, 128 }; > +static const unsigned int ad778x_odr_avail[2] = { 10000, 16700 }; > + > +struct ad7780_chip_info { > + struct iio_chan_spec channel; > + unsigned int pattern_mask; > + unsigned int pattern; > + bool is_ad778x; > +}; > + > +struct ad7780_state { > + const struct ad7780_chip_info *chip_info; > + struct regulator *reg; > + struct gpio_desc *powerdown_gpio; > + struct gpio_desc *gain_gpio; > + struct gpio_desc *filter_gpio; > + unsigned int gain; > + unsigned int odr; > + unsigned int int_vref_mv; > + > + struct ad_sigma_delta sd; > +}; > + > +enum ad7780_supported_device_ids { > + ID_AD7170, > + ID_AD7171, > + ID_AD7780, > + ID_AD7781, > +}; > + > +static struct ad7780_state *ad_sigma_delta_to_ad7780(struct ad_sigma_delta *sd) > +{ > + return container_of(sd, struct ad7780_state, sd); > +} > + > +static int ad7780_set_mode(struct ad_sigma_delta *sigma_delta, > + enum ad_sigma_delta_mode mode) > +{ > + struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); > + unsigned int val; > + > + switch (mode) { > + case AD_SD_MODE_SINGLE: > + case AD_SD_MODE_CONTINUOUS: > + val = 1; > + break; > + default: > + val = 0; > + break; > + } > + > + gpiod_set_value(st->powerdown_gpio, val); > + > + return 0; > +} > + > +static int ad7780_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, > + int *val2, > + long m) > +{ > + struct ad7780_state *st = iio_priv(indio_dev); > + int voltage_uv; > + > + switch (m) { > + case IIO_CHAN_INFO_RAW: > + return ad_sigma_delta_single_conversion(indio_dev, chan, val); > + case IIO_CHAN_INFO_SCALE: > + voltage_uv = regulator_get_voltage(st->reg); > + if (voltage_uv < 0) > + return voltage_uv; > + voltage_uv /= 1000; > + *val = voltage_uv * st->gain; > + *val2 = chan->scan_type.realbits - 1; > + st->int_vref_mv = voltage_uv; > + return IIO_VAL_FRACTIONAL_LOG2; > + case IIO_CHAN_INFO_OFFSET: > + *val = -(1 << (chan->scan_type.realbits - 1)); > + return IIO_VAL_INT; > + case IIO_CHAN_INFO_SAMP_FREQ: > + *val = st->odr; > + return IIO_VAL_INT; > + default: > + break; > + } > + > + return -EINVAL; > +} > + > +static int ad7780_write_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int val, > + int val2, > + long m) > +{ > + struct ad7780_state *st = iio_priv(indio_dev); > + const struct ad7780_chip_info *chip_info = st->chip_info; > + unsigned long long vref; > + unsigned int full_scale, gain; > + > + if (!chip_info->is_ad778x) > + return -EINVAL; > + > + switch (m) { > + case IIO_CHAN_INFO_SCALE: > + if (val != 0) > + return -EINVAL; > + > + vref = st->int_vref_mv * 1000000LL; > + full_scale = 1 << (chip_info->channel.scan_type.realbits - 1); > + gain = DIV_ROUND_CLOSEST(vref, full_scale); > + gain = DIV_ROUND_CLOSEST(gain, val2); > + st->gain = gain; > + if (gain < AD7780_GAIN_MIDPOINT) > + gain = 0; > + else > + gain = 1; > + gpiod_set_value(st->gain_gpio, gain); > + break; > + case IIO_CHAN_INFO_SAMP_FREQ: > + if (1000*val + val2/1000 < AD7780_FILTER_MIDPOINT) > + val = 0; > + else > + val = 1; > + st->odr = ad778x_odr_avail[val]; > + gpiod_set_value(st->filter_gpio, val); > + break; > + default: > + break; > + } > + > + return 0; > +} > + > +static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta, > + unsigned int raw_sample) > +{ > + struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); > + const struct ad7780_chip_info *chip_info = st->chip_info; > + > + if ((raw_sample & AD7780_ERR) || > + ((raw_sample & chip_info->pattern_mask) != chip_info->pattern)) > + return -EIO; > + > + if (chip_info->is_ad778x) { > + st->gain = ad778x_gain[raw_sample & AD7780_GAIN]; > + st->odr = ad778x_odr_avail[raw_sample & AD7780_FILTER]; > + } > + > + return 0; > +} > + > +static const struct ad_sigma_delta_info ad7780_sigma_delta_info = { > + .set_mode = ad7780_set_mode, > + .postprocess_sample = ad7780_postprocess_sample, > + .has_registers = false, > +}; > + > +#define AD7780_CHANNEL(bits, wordsize) \ > + AD_SD_CHANNEL(1, 0, 0, bits, 32, wordsize - bits) > +#define AD7170_CHANNEL(bits, wordsize) \ > + AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits) > + > +static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { > + [ID_AD7170] = { > + .channel = AD7170_CHANNEL(12, 24), > + .pattern = AD7170_PATTERN_GOOD, > + .pattern_mask = AD7170_PATTERN_MASK, > + .is_ad778x = false, > + }, > + [ID_AD7171] = { > + .channel = AD7170_CHANNEL(16, 24), > + .pattern = AD7170_PATTERN_GOOD, > + .pattern_mask = AD7170_PATTERN_MASK, > + .is_ad778x = false, > + }, > + [ID_AD7780] = { > + .channel = AD7780_CHANNEL(24, 32), > + .pattern = AD7780_PATTERN_GOOD, > + .pattern_mask = AD7780_PATTERN_MASK, > + .is_ad778x = true, > + }, > + [ID_AD7781] = { > + .channel = AD7780_CHANNEL(20, 32), > + .pattern = AD7780_PATTERN_GOOD, > + .pattern_mask = AD7780_PATTERN_MASK, > + .is_ad778x = true, > + }, > +}; > + > +static const struct iio_info ad7780_info = { > + .read_raw = ad7780_read_raw, > + .write_raw = ad7780_write_raw, > +}; > + > +static int ad7780_init_gpios(struct device *dev, struct ad7780_state *st) > +{ > + int ret; > + > + st->powerdown_gpio = devm_gpiod_get_optional(dev, > + "powerdown", > + GPIOD_OUT_LOW); > + if (IS_ERR(st->powerdown_gpio)) { > + ret = PTR_ERR(st->powerdown_gpio); > + dev_err(dev, "Failed to request powerdown GPIO: %d\n", ret); > + return ret; > + } > + > + if (!st->chip_info->is_ad778x) > + return 0; > + > + > + st->gain_gpio = devm_gpiod_get_optional(dev, > + "adi,gain", > + GPIOD_OUT_HIGH); > + if (IS_ERR(st->gain_gpio)) { > + ret = PTR_ERR(st->gain_gpio); > + dev_err(dev, "Failed to request gain GPIO: %d\n", ret); > + return ret; > + } > + > + st->filter_gpio = devm_gpiod_get_optional(dev, > + "adi,filter", > + GPIOD_OUT_HIGH); > + if (IS_ERR(st->filter_gpio)) { > + ret = PTR_ERR(st->filter_gpio); > + dev_err(dev, "Failed to request filter GPIO: %d\n", ret); > + return ret; > + } > + > + return 0; > +} > + > +static int ad7780_probe(struct spi_device *spi) > +{ > + struct ad7780_state *st; > + struct iio_dev *indio_dev; > + int ret; > + > + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); > + if (!indio_dev) > + return -ENOMEM; > + > + st = iio_priv(indio_dev); > + st->gain = 1; > + > + ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info); > + > + st->chip_info = > + &ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data]; > + > + spi_set_drvdata(spi, indio_dev); > + > + indio_dev->dev.parent = &spi->dev; > + indio_dev->name = spi_get_device_id(spi)->name; > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->channels = &st->chip_info->channel; > + indio_dev->num_channels = 1; > + indio_dev->info = &ad7780_info; > + > + ret = ad7780_init_gpios(&spi->dev, st); > + if (ret) > + goto error_cleanup_buffer_and_trigger; > + > + st->reg = devm_regulator_get(&spi->dev, "avdd"); > + if (IS_ERR(st->reg)) > + return PTR_ERR(st->reg); > + > + ret = regulator_enable(st->reg); > + if (ret) { > + dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); > + return ret; > + } > + > + ret = ad_sd_setup_buffer_and_trigger(indio_dev); > + if (ret) > + goto error_disable_reg; > + > + ret = iio_device_register(indio_dev); > + if (ret) > + goto error_cleanup_buffer_and_trigger; > + > + return 0; > + > +error_cleanup_buffer_and_trigger: > + ad_sd_cleanup_buffer_and_trigger(indio_dev); > +error_disable_reg: > + regulator_disable(st->reg); > + > + return ret; > +} > + > +static int ad7780_remove(struct spi_device *spi) > +{ > + struct iio_dev *indio_dev = spi_get_drvdata(spi); > + struct ad7780_state *st = iio_priv(indio_dev); > + > + iio_device_unregister(indio_dev); > + ad_sd_cleanup_buffer_and_trigger(indio_dev); > + > + regulator_disable(st->reg); > + > + return 0; > +} > + > +static const struct spi_device_id ad7780_id[] = { > + {"ad7170", ID_AD7170}, > + {"ad7171", ID_AD7171}, > + {"ad7780", ID_AD7780}, > + {"ad7781", ID_AD7781}, > + {} > +}; > +MODULE_DEVICE_TABLE(spi, ad7780_id); > + > +static struct spi_driver ad7780_driver = { > + .driver = { > + .name = "ad7780", > + }, > + .probe = ad7780_probe, > + .remove = ad7780_remove, > + .id_table = ad7780_id, > +}; > +module_spi_driver(ad7780_driver); > + > +MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); > +MODULE_DESCRIPTION("Analog Devices AD7780 and similar ADCs"); > +MODULE_LICENSE("GPL v2");
On 03/16, Jonathan Cameron wrote: >On Fri, 15 Mar 2019 23:15:55 -0300 >Renato Lui Geh <renatogeh@gmail.com> wrote: > >> Move ad7780 ADC driver out of staging and into the mainline. >> >> The ad7780 is a sigma-delta analog to digital converter. This driver provides >> reading voltage values and status bits from both the ad778x and ad717x series. >> Its interface also allows writing on the FILTER and GAIN GPIO pins on the >> ad778x. >> >> Signed-off-by: Renato Lui Geh <renatogeh@gmail.com> >> Signed-off-by: Giuliano Belinassi <giuliano.belinassi@usp.br> >> Co-developed-by: Giuliano Belinassi <giuliano.belinassi@usp.br> > >Applied to the togreg branch of iio.git and pushed out as testing. >Note I won't be pushing that out as non rebasing (togreg) until at >least next weekend, so there is a bit of time for any last minute >feedback etc. > >Thanks for all your hard work on this and great to see it graduate from >staging! Huge thanks to both you and Alexandru for all the great feedback and help on this! Hope to continue to send many more contributions here. :) > >Thanks, > >Jonathan > >> --- >> Changes in v3: >> - Changes unrelated to moving the driver to main tree were resent as >> individual patches >> Changes in v4: >> - Removed line warning it was safe to build the ad7780 driver by >> default >> >> drivers/iio/adc/Kconfig | 12 + >> drivers/iio/adc/Makefile | 1 + >> drivers/iio/adc/ad7780.c | 376 +++++++++++++++++++++++++++++++ >> drivers/staging/iio/adc/Kconfig | 13 -- >> drivers/staging/iio/adc/Makefile | 1 - >> drivers/staging/iio/adc/ad7780.c | 376 ------------------------------- >> 6 files changed, 389 insertions(+), 390 deletions(-) >> create mode 100644 drivers/iio/adc/ad7780.c >> delete mode 100644 drivers/staging/iio/adc/ad7780.c >> >> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig >> index f3cc7a31bce5..6b36a45bd09f 100644 >> --- a/drivers/iio/adc/Kconfig >> +++ b/drivers/iio/adc/Kconfig >> @@ -108,6 +108,18 @@ config AD7766 >> To compile this driver as a module, choose M here: the module will be >> called ad7766. >> >> +config AD7780 >> + tristate "Analog Devices AD7780 and similar ADCs driver" >> + depends on SPI >> + depends on GPIOLIB || COMPILE_TEST >> + select AD_SIGMA_DELTA >> + help >> + Say yes here to build support for Analog Devices AD7170, AD7171, >> + AD7780 and AD7781 SPI analog to digital converters (ADC). >> + >> + To compile this driver as a module, choose M here: the >> + module will be called ad7780. >> + >> config AD7791 >> tristate "Analog Devices AD7791 ADC driver" >> depends on SPI >> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile >> index ea5031348052..b48852157115 100644 >> --- a/drivers/iio/adc/Makefile >> +++ b/drivers/iio/adc/Makefile >> @@ -15,6 +15,7 @@ obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o >> obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o >> obj-$(CONFIG_AD7606) += ad7606.o >> obj-$(CONFIG_AD7766) += ad7766.o >> +obj-$(CONFIG_AD7780) += ad7780.o >> obj-$(CONFIG_AD7791) += ad7791.o >> obj-$(CONFIG_AD7793) += ad7793.o >> obj-$(CONFIG_AD7887) += ad7887.o >> diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c >> new file mode 100644 >> index 000000000000..23b731a92e32 >> --- /dev/null >> +++ b/drivers/iio/adc/ad7780.c >> @@ -0,0 +1,376 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +/* >> + * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver >> + * >> + * Copyright 2011 Analog Devices Inc. >> + * Copyright 2019 Renato Lui Geh >> + */ >> + >> +#include <linux/interrupt.h> >> +#include <linux/device.h> >> +#include <linux/kernel.h> >> +#include <linux/slab.h> >> +#include <linux/sysfs.h> >> +#include <linux/spi/spi.h> >> +#include <linux/regulator/consumer.h> >> +#include <linux/err.h> >> +#include <linux/sched.h> >> +#include <linux/gpio/consumer.h> >> +#include <linux/module.h> >> +#include <linux/bits.h> >> + >> +#include <linux/iio/iio.h> >> +#include <linux/iio/sysfs.h> >> +#include <linux/iio/adc/ad_sigma_delta.h> >> + >> +#define AD7780_RDY BIT(7) >> +#define AD7780_FILTER BIT(6) >> +#define AD7780_ERR BIT(5) >> +#define AD7780_ID1 BIT(4) >> +#define AD7780_ID0 BIT(3) >> +#define AD7780_GAIN BIT(2) >> + >> +#define AD7170_ID 0 >> +#define AD7171_ID 1 >> +#define AD7780_ID 1 >> +#define AD7781_ID 0 >> + >> +#define AD7780_ID_MASK (AD7780_ID0 | AD7780_ID1) >> + >> +#define AD7780_PATTERN_GOOD 1 >> +#define AD7780_PATTERN_MASK GENMASK(1, 0) >> + >> +#define AD7170_PATTERN_GOOD 5 >> +#define AD7170_PATTERN_MASK GENMASK(2, 0) >> + >> +#define AD7780_GAIN_MIDPOINT 64 >> +#define AD7780_FILTER_MIDPOINT 13350 >> + >> +static const unsigned int ad778x_gain[2] = { 1, 128 }; >> +static const unsigned int ad778x_odr_avail[2] = { 10000, 16700 }; >> + >> +struct ad7780_chip_info { >> + struct iio_chan_spec channel; >> + unsigned int pattern_mask; >> + unsigned int pattern; >> + bool is_ad778x; >> +}; >> + >> +struct ad7780_state { >> + const struct ad7780_chip_info *chip_info; >> + struct regulator *reg; >> + struct gpio_desc *powerdown_gpio; >> + struct gpio_desc *gain_gpio; >> + struct gpio_desc *filter_gpio; >> + unsigned int gain; >> + unsigned int odr; >> + unsigned int int_vref_mv; >> + >> + struct ad_sigma_delta sd; >> +}; >> + >> +enum ad7780_supported_device_ids { >> + ID_AD7170, >> + ID_AD7171, >> + ID_AD7780, >> + ID_AD7781, >> +}; >> + >> +static struct ad7780_state *ad_sigma_delta_to_ad7780(struct ad_sigma_delta *sd) >> +{ >> + return container_of(sd, struct ad7780_state, sd); >> +} >> + >> +static int ad7780_set_mode(struct ad_sigma_delta *sigma_delta, >> + enum ad_sigma_delta_mode mode) >> +{ >> + struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); >> + unsigned int val; >> + >> + switch (mode) { >> + case AD_SD_MODE_SINGLE: >> + case AD_SD_MODE_CONTINUOUS: >> + val = 1; >> + break; >> + default: >> + val = 0; >> + break; >> + } >> + >> + gpiod_set_value(st->powerdown_gpio, val); >> + >> + return 0; >> +} >> + >> +static int ad7780_read_raw(struct iio_dev *indio_dev, >> + struct iio_chan_spec const *chan, >> + int *val, >> + int *val2, >> + long m) >> +{ >> + struct ad7780_state *st = iio_priv(indio_dev); >> + int voltage_uv; >> + >> + switch (m) { >> + case IIO_CHAN_INFO_RAW: >> + return ad_sigma_delta_single_conversion(indio_dev, chan, val); >> + case IIO_CHAN_INFO_SCALE: >> + voltage_uv = regulator_get_voltage(st->reg); >> + if (voltage_uv < 0) >> + return voltage_uv; >> + voltage_uv /= 1000; >> + *val = voltage_uv * st->gain; >> + *val2 = chan->scan_type.realbits - 1; >> + st->int_vref_mv = voltage_uv; >> + return IIO_VAL_FRACTIONAL_LOG2; >> + case IIO_CHAN_INFO_OFFSET: >> + *val = -(1 << (chan->scan_type.realbits - 1)); >> + return IIO_VAL_INT; >> + case IIO_CHAN_INFO_SAMP_FREQ: >> + *val = st->odr; >> + return IIO_VAL_INT; >> + default: >> + break; >> + } >> + >> + return -EINVAL; >> +} >> + >> +static int ad7780_write_raw(struct iio_dev *indio_dev, >> + struct iio_chan_spec const *chan, >> + int val, >> + int val2, >> + long m) >> +{ >> + struct ad7780_state *st = iio_priv(indio_dev); >> + const struct ad7780_chip_info *chip_info = st->chip_info; >> + unsigned long long vref; >> + unsigned int full_scale, gain; >> + >> + if (!chip_info->is_ad778x) >> + return -EINVAL; >> + >> + switch (m) { >> + case IIO_CHAN_INFO_SCALE: >> + if (val != 0) >> + return -EINVAL; >> + >> + vref = st->int_vref_mv * 1000000LL; >> + full_scale = 1 << (chip_info->channel.scan_type.realbits - 1); >> + gain = DIV_ROUND_CLOSEST(vref, full_scale); >> + gain = DIV_ROUND_CLOSEST(gain, val2); >> + st->gain = gain; >> + if (gain < AD7780_GAIN_MIDPOINT) >> + gain = 0; >> + else >> + gain = 1; >> + gpiod_set_value(st->gain_gpio, gain); >> + break; >> + case IIO_CHAN_INFO_SAMP_FREQ: >> + if (1000*val + val2/1000 < AD7780_FILTER_MIDPOINT) >> + val = 0; >> + else >> + val = 1; >> + st->odr = ad778x_odr_avail[val]; >> + gpiod_set_value(st->filter_gpio, val); >> + break; >> + default: >> + break; >> + } >> + >> + return 0; >> +} >> + >> +static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta, >> + unsigned int raw_sample) >> +{ >> + struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); >> + const struct ad7780_chip_info *chip_info = st->chip_info; >> + >> + if ((raw_sample & AD7780_ERR) || >> + ((raw_sample & chip_info->pattern_mask) != chip_info->pattern)) >> + return -EIO; >> + >> + if (chip_info->is_ad778x) { >> + st->gain = ad778x_gain[raw_sample & AD7780_GAIN]; >> + st->odr = ad778x_odr_avail[raw_sample & AD7780_FILTER]; >> + } >> + >> + return 0; >> +} >> + >> +static const struct ad_sigma_delta_info ad7780_sigma_delta_info = { >> + .set_mode = ad7780_set_mode, >> + .postprocess_sample = ad7780_postprocess_sample, >> + .has_registers = false, >> +}; >> + >> +#define AD7780_CHANNEL(bits, wordsize) \ >> + AD_SD_CHANNEL(1, 0, 0, bits, 32, wordsize - bits) >> +#define AD7170_CHANNEL(bits, wordsize) \ >> + AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits) >> + >> +static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { >> + [ID_AD7170] = { >> + .channel = AD7170_CHANNEL(12, 24), >> + .pattern = AD7170_PATTERN_GOOD, >> + .pattern_mask = AD7170_PATTERN_MASK, >> + .is_ad778x = false, >> + }, >> + [ID_AD7171] = { >> + .channel = AD7170_CHANNEL(16, 24), >> + .pattern = AD7170_PATTERN_GOOD, >> + .pattern_mask = AD7170_PATTERN_MASK, >> + .is_ad778x = false, >> + }, >> + [ID_AD7780] = { >> + .channel = AD7780_CHANNEL(24, 32), >> + .pattern = AD7780_PATTERN_GOOD, >> + .pattern_mask = AD7780_PATTERN_MASK, >> + .is_ad778x = true, >> + }, >> + [ID_AD7781] = { >> + .channel = AD7780_CHANNEL(20, 32), >> + .pattern = AD7780_PATTERN_GOOD, >> + .pattern_mask = AD7780_PATTERN_MASK, >> + .is_ad778x = true, >> + }, >> +}; >> + >> +static const struct iio_info ad7780_info = { >> + .read_raw = ad7780_read_raw, >> + .write_raw = ad7780_write_raw, >> +}; >> + >> +static int ad7780_init_gpios(struct device *dev, struct ad7780_state *st) >> +{ >> + int ret; >> + >> + st->powerdown_gpio = devm_gpiod_get_optional(dev, >> + "powerdown", >> + GPIOD_OUT_LOW); >> + if (IS_ERR(st->powerdown_gpio)) { >> + ret = PTR_ERR(st->powerdown_gpio); >> + dev_err(dev, "Failed to request powerdown GPIO: %d\n", ret); >> + return ret; >> + } >> + >> + if (!st->chip_info->is_ad778x) >> + return 0; >> + >> + >> + st->gain_gpio = devm_gpiod_get_optional(dev, >> + "adi,gain", >> + GPIOD_OUT_HIGH); >> + if (IS_ERR(st->gain_gpio)) { >> + ret = PTR_ERR(st->gain_gpio); >> + dev_err(dev, "Failed to request gain GPIO: %d\n", ret); >> + return ret; >> + } >> + >> + st->filter_gpio = devm_gpiod_get_optional(dev, >> + "adi,filter", >> + GPIOD_OUT_HIGH); >> + if (IS_ERR(st->filter_gpio)) { >> + ret = PTR_ERR(st->filter_gpio); >> + dev_err(dev, "Failed to request filter GPIO: %d\n", ret); >> + return ret; >> + } >> + >> + return 0; >> +} >> + >> +static int ad7780_probe(struct spi_device *spi) >> +{ >> + struct ad7780_state *st; >> + struct iio_dev *indio_dev; >> + int ret; >> + >> + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); >> + if (!indio_dev) >> + return -ENOMEM; >> + >> + st = iio_priv(indio_dev); >> + st->gain = 1; >> + >> + ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info); >> + >> + st->chip_info = >> + &ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data]; >> + >> + spi_set_drvdata(spi, indio_dev); >> + >> + indio_dev->dev.parent = &spi->dev; >> + indio_dev->name = spi_get_device_id(spi)->name; >> + indio_dev->modes = INDIO_DIRECT_MODE; >> + indio_dev->channels = &st->chip_info->channel; >> + indio_dev->num_channels = 1; >> + indio_dev->info = &ad7780_info; >> + >> + ret = ad7780_init_gpios(&spi->dev, st); >> + if (ret) >> + goto error_cleanup_buffer_and_trigger; >> + >> + st->reg = devm_regulator_get(&spi->dev, "avdd"); >> + if (IS_ERR(st->reg)) >> + return PTR_ERR(st->reg); >> + >> + ret = regulator_enable(st->reg); >> + if (ret) { >> + dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); >> + return ret; >> + } >> + >> + ret = ad_sd_setup_buffer_and_trigger(indio_dev); >> + if (ret) >> + goto error_disable_reg; >> + >> + ret = iio_device_register(indio_dev); >> + if (ret) >> + goto error_cleanup_buffer_and_trigger; >> + >> + return 0; >> + >> +error_cleanup_buffer_and_trigger: >> + ad_sd_cleanup_buffer_and_trigger(indio_dev); >> +error_disable_reg: >> + regulator_disable(st->reg); >> + >> + return ret; >> +} >> + >> +static int ad7780_remove(struct spi_device *spi) >> +{ >> + struct iio_dev *indio_dev = spi_get_drvdata(spi); >> + struct ad7780_state *st = iio_priv(indio_dev); >> + >> + iio_device_unregister(indio_dev); >> + ad_sd_cleanup_buffer_and_trigger(indio_dev); >> + >> + regulator_disable(st->reg); >> + >> + return 0; >> +} >> + >> +static const struct spi_device_id ad7780_id[] = { >> + {"ad7170", ID_AD7170}, >> + {"ad7171", ID_AD7171}, >> + {"ad7780", ID_AD7780}, >> + {"ad7781", ID_AD7781}, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(spi, ad7780_id); >> + >> +static struct spi_driver ad7780_driver = { >> + .driver = { >> + .name = "ad7780", >> + }, >> + .probe = ad7780_probe, >> + .remove = ad7780_remove, >> + .id_table = ad7780_id, >> +}; >> +module_spi_driver(ad7780_driver); >> + >> +MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); >> +MODULE_DESCRIPTION("Analog Devices AD7780 and similar ADCs"); >> +MODULE_LICENSE("GPL v2"); > >
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index f3cc7a31bce5..6b36a45bd09f 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -108,6 +108,18 @@ config AD7766 To compile this driver as a module, choose M here: the module will be called ad7766. +config AD7780 + tristate "Analog Devices AD7780 and similar ADCs driver" + depends on SPI + depends on GPIOLIB || COMPILE_TEST + select AD_SIGMA_DELTA + help + Say yes here to build support for Analog Devices AD7170, AD7171, + AD7780 and AD7781 SPI analog to digital converters (ADC). + + To compile this driver as a module, choose M here: the + module will be called ad7780. + config AD7791 tristate "Analog Devices AD7791 ADC driver" depends on SPI diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index ea5031348052..b48852157115 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o obj-$(CONFIG_AD7606) += ad7606.o obj-$(CONFIG_AD7766) += ad7766.o +obj-$(CONFIG_AD7780) += ad7780.o obj-$(CONFIG_AD7791) += ad7791.o obj-$(CONFIG_AD7793) += ad7793.o obj-$(CONFIG_AD7887) += ad7887.o diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c new file mode 100644 index 000000000000..23b731a92e32 --- /dev/null +++ b/drivers/iio/adc/ad7780.c @@ -0,0 +1,376 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * Copyright 2019 Renato Lui Geh + */ + +#include <linux/interrupt.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/spi/spi.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> +#include <linux/sched.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/bits.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/adc/ad_sigma_delta.h> + +#define AD7780_RDY BIT(7) +#define AD7780_FILTER BIT(6) +#define AD7780_ERR BIT(5) +#define AD7780_ID1 BIT(4) +#define AD7780_ID0 BIT(3) +#define AD7780_GAIN BIT(2) + +#define AD7170_ID 0 +#define AD7171_ID 1 +#define AD7780_ID 1 +#define AD7781_ID 0 + +#define AD7780_ID_MASK (AD7780_ID0 | AD7780_ID1) + +#define AD7780_PATTERN_GOOD 1 +#define AD7780_PATTERN_MASK GENMASK(1, 0) + +#define AD7170_PATTERN_GOOD 5 +#define AD7170_PATTERN_MASK GENMASK(2, 0) + +#define AD7780_GAIN_MIDPOINT 64 +#define AD7780_FILTER_MIDPOINT 13350 + +static const unsigned int ad778x_gain[2] = { 1, 128 }; +static const unsigned int ad778x_odr_avail[2] = { 10000, 16700 }; + +struct ad7780_chip_info { + struct iio_chan_spec channel; + unsigned int pattern_mask; + unsigned int pattern; + bool is_ad778x; +}; + +struct ad7780_state { + const struct ad7780_chip_info *chip_info; + struct regulator *reg; + struct gpio_desc *powerdown_gpio; + struct gpio_desc *gain_gpio; + struct gpio_desc *filter_gpio; + unsigned int gain; + unsigned int odr; + unsigned int int_vref_mv; + + struct ad_sigma_delta sd; +}; + +enum ad7780_supported_device_ids { + ID_AD7170, + ID_AD7171, + ID_AD7780, + ID_AD7781, +}; + +static struct ad7780_state *ad_sigma_delta_to_ad7780(struct ad_sigma_delta *sd) +{ + return container_of(sd, struct ad7780_state, sd); +} + +static int ad7780_set_mode(struct ad_sigma_delta *sigma_delta, + enum ad_sigma_delta_mode mode) +{ + struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); + unsigned int val; + + switch (mode) { + case AD_SD_MODE_SINGLE: + case AD_SD_MODE_CONTINUOUS: + val = 1; + break; + default: + val = 0; + break; + } + + gpiod_set_value(st->powerdown_gpio, val); + + return 0; +} + +static int ad7780_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + struct ad7780_state *st = iio_priv(indio_dev); + int voltage_uv; + + switch (m) { + case IIO_CHAN_INFO_RAW: + return ad_sigma_delta_single_conversion(indio_dev, chan, val); + case IIO_CHAN_INFO_SCALE: + voltage_uv = regulator_get_voltage(st->reg); + if (voltage_uv < 0) + return voltage_uv; + voltage_uv /= 1000; + *val = voltage_uv * st->gain; + *val2 = chan->scan_type.realbits - 1; + st->int_vref_mv = voltage_uv; + return IIO_VAL_FRACTIONAL_LOG2; + case IIO_CHAN_INFO_OFFSET: + *val = -(1 << (chan->scan_type.realbits - 1)); + return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = st->odr; + return IIO_VAL_INT; + default: + break; + } + + return -EINVAL; +} + +static int ad7780_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long m) +{ + struct ad7780_state *st = iio_priv(indio_dev); + const struct ad7780_chip_info *chip_info = st->chip_info; + unsigned long long vref; + unsigned int full_scale, gain; + + if (!chip_info->is_ad778x) + return -EINVAL; + + switch (m) { + case IIO_CHAN_INFO_SCALE: + if (val != 0) + return -EINVAL; + + vref = st->int_vref_mv * 1000000LL; + full_scale = 1 << (chip_info->channel.scan_type.realbits - 1); + gain = DIV_ROUND_CLOSEST(vref, full_scale); + gain = DIV_ROUND_CLOSEST(gain, val2); + st->gain = gain; + if (gain < AD7780_GAIN_MIDPOINT) + gain = 0; + else + gain = 1; + gpiod_set_value(st->gain_gpio, gain); + break; + case IIO_CHAN_INFO_SAMP_FREQ: + if (1000*val + val2/1000 < AD7780_FILTER_MIDPOINT) + val = 0; + else + val = 1; + st->odr = ad778x_odr_avail[val]; + gpiod_set_value(st->filter_gpio, val); + break; + default: + break; + } + + return 0; +} + +static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta, + unsigned int raw_sample) +{ + struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); + const struct ad7780_chip_info *chip_info = st->chip_info; + + if ((raw_sample & AD7780_ERR) || + ((raw_sample & chip_info->pattern_mask) != chip_info->pattern)) + return -EIO; + + if (chip_info->is_ad778x) { + st->gain = ad778x_gain[raw_sample & AD7780_GAIN]; + st->odr = ad778x_odr_avail[raw_sample & AD7780_FILTER]; + } + + return 0; +} + +static const struct ad_sigma_delta_info ad7780_sigma_delta_info = { + .set_mode = ad7780_set_mode, + .postprocess_sample = ad7780_postprocess_sample, + .has_registers = false, +}; + +#define AD7780_CHANNEL(bits, wordsize) \ + AD_SD_CHANNEL(1, 0, 0, bits, 32, wordsize - bits) +#define AD7170_CHANNEL(bits, wordsize) \ + AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits) + +static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { + [ID_AD7170] = { + .channel = AD7170_CHANNEL(12, 24), + .pattern = AD7170_PATTERN_GOOD, + .pattern_mask = AD7170_PATTERN_MASK, + .is_ad778x = false, + }, + [ID_AD7171] = { + .channel = AD7170_CHANNEL(16, 24), + .pattern = AD7170_PATTERN_GOOD, + .pattern_mask = AD7170_PATTERN_MASK, + .is_ad778x = false, + }, + [ID_AD7780] = { + .channel = AD7780_CHANNEL(24, 32), + .pattern = AD7780_PATTERN_GOOD, + .pattern_mask = AD7780_PATTERN_MASK, + .is_ad778x = true, + }, + [ID_AD7781] = { + .channel = AD7780_CHANNEL(20, 32), + .pattern = AD7780_PATTERN_GOOD, + .pattern_mask = AD7780_PATTERN_MASK, + .is_ad778x = true, + }, +}; + +static const struct iio_info ad7780_info = { + .read_raw = ad7780_read_raw, + .write_raw = ad7780_write_raw, +}; + +static int ad7780_init_gpios(struct device *dev, struct ad7780_state *st) +{ + int ret; + + st->powerdown_gpio = devm_gpiod_get_optional(dev, + "powerdown", + GPIOD_OUT_LOW); + if (IS_ERR(st->powerdown_gpio)) { + ret = PTR_ERR(st->powerdown_gpio); + dev_err(dev, "Failed to request powerdown GPIO: %d\n", ret); + return ret; + } + + if (!st->chip_info->is_ad778x) + return 0; + + + st->gain_gpio = devm_gpiod_get_optional(dev, + "adi,gain", + GPIOD_OUT_HIGH); + if (IS_ERR(st->gain_gpio)) { + ret = PTR_ERR(st->gain_gpio); + dev_err(dev, "Failed to request gain GPIO: %d\n", ret); + return ret; + } + + st->filter_gpio = devm_gpiod_get_optional(dev, + "adi,filter", + GPIOD_OUT_HIGH); + if (IS_ERR(st->filter_gpio)) { + ret = PTR_ERR(st->filter_gpio); + dev_err(dev, "Failed to request filter GPIO: %d\n", ret); + return ret; + } + + return 0; +} + +static int ad7780_probe(struct spi_device *spi) +{ + struct ad7780_state *st; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st = iio_priv(indio_dev); + st->gain = 1; + + ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info); + + st->chip_info = + &ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + + spi_set_drvdata(spi, indio_dev); + + indio_dev->dev.parent = &spi->dev; + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = &st->chip_info->channel; + indio_dev->num_channels = 1; + indio_dev->info = &ad7780_info; + + ret = ad7780_init_gpios(&spi->dev, st); + if (ret) + goto error_cleanup_buffer_and_trigger; + + st->reg = devm_regulator_get(&spi->dev, "avdd"); + if (IS_ERR(st->reg)) + return PTR_ERR(st->reg); + + ret = regulator_enable(st->reg); + if (ret) { + dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); + return ret; + } + + ret = ad_sd_setup_buffer_and_trigger(indio_dev); + if (ret) + goto error_disable_reg; + + ret = iio_device_register(indio_dev); + if (ret) + goto error_cleanup_buffer_and_trigger; + + return 0; + +error_cleanup_buffer_and_trigger: + ad_sd_cleanup_buffer_and_trigger(indio_dev); +error_disable_reg: + regulator_disable(st->reg); + + return ret; +} + +static int ad7780_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct ad7780_state *st = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + ad_sd_cleanup_buffer_and_trigger(indio_dev); + + regulator_disable(st->reg); + + return 0; +} + +static const struct spi_device_id ad7780_id[] = { + {"ad7170", ID_AD7170}, + {"ad7171", ID_AD7171}, + {"ad7780", ID_AD7780}, + {"ad7781", ID_AD7781}, + {} +}; +MODULE_DEVICE_TABLE(spi, ad7780_id); + +static struct spi_driver ad7780_driver = { + .driver = { + .name = "ad7780", + }, + .probe = ad7780_probe, + .remove = ad7780_remove, + .id_table = ad7780_id, +}; +module_spi_driver(ad7780_driver); + +MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); +MODULE_DESCRIPTION("Analog Devices AD7780 and similar ADCs"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 7a93d3a5c113..404a53c743a6 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -3,19 +3,6 @@ # menu "Analog to digital converters" -config AD7780 - tristate "Analog Devices AD7780 and similar ADCs driver" - depends on SPI - depends on GPIOLIB || COMPILE_TEST - select AD_SIGMA_DELTA - help - Say yes here to build support for Analog Devices AD7170, AD7171, - AD7780 and AD7781 SPI analog to digital converters (ADC). - If unsure, say N (but it's safe to say "Y"). - - To compile this driver as a module, choose M here: the - module will be called ad7780. - config AD7816 tristate "Analog Devices AD7816/7/8 temperature sensor and ADC driver" depends on SPI diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index 7a421088ff82..4b76769b32bc 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -3,7 +3,6 @@ # Makefile for industrial I/O ADC drivers # -obj-$(CONFIG_AD7780) += ad7780.o obj-$(CONFIG_AD7816) += ad7816.o obj-$(CONFIG_AD7192) += ad7192.o obj-$(CONFIG_AD7280) += ad7280a.o diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c deleted file mode 100644 index 23b731a92e32..000000000000 --- a/drivers/staging/iio/adc/ad7780.c +++ /dev/null @@ -1,376 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver - * - * Copyright 2011 Analog Devices Inc. - * Copyright 2019 Renato Lui Geh - */ - -#include <linux/interrupt.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/sysfs.h> -#include <linux/spi/spi.h> -#include <linux/regulator/consumer.h> -#include <linux/err.h> -#include <linux/sched.h> -#include <linux/gpio/consumer.h> -#include <linux/module.h> -#include <linux/bits.h> - -#include <linux/iio/iio.h> -#include <linux/iio/sysfs.h> -#include <linux/iio/adc/ad_sigma_delta.h> - -#define AD7780_RDY BIT(7) -#define AD7780_FILTER BIT(6) -#define AD7780_ERR BIT(5) -#define AD7780_ID1 BIT(4) -#define AD7780_ID0 BIT(3) -#define AD7780_GAIN BIT(2) - -#define AD7170_ID 0 -#define AD7171_ID 1 -#define AD7780_ID 1 -#define AD7781_ID 0 - -#define AD7780_ID_MASK (AD7780_ID0 | AD7780_ID1) - -#define AD7780_PATTERN_GOOD 1 -#define AD7780_PATTERN_MASK GENMASK(1, 0) - -#define AD7170_PATTERN_GOOD 5 -#define AD7170_PATTERN_MASK GENMASK(2, 0) - -#define AD7780_GAIN_MIDPOINT 64 -#define AD7780_FILTER_MIDPOINT 13350 - -static const unsigned int ad778x_gain[2] = { 1, 128 }; -static const unsigned int ad778x_odr_avail[2] = { 10000, 16700 }; - -struct ad7780_chip_info { - struct iio_chan_spec channel; - unsigned int pattern_mask; - unsigned int pattern; - bool is_ad778x; -}; - -struct ad7780_state { - const struct ad7780_chip_info *chip_info; - struct regulator *reg; - struct gpio_desc *powerdown_gpio; - struct gpio_desc *gain_gpio; - struct gpio_desc *filter_gpio; - unsigned int gain; - unsigned int odr; - unsigned int int_vref_mv; - - struct ad_sigma_delta sd; -}; - -enum ad7780_supported_device_ids { - ID_AD7170, - ID_AD7171, - ID_AD7780, - ID_AD7781, -}; - -static struct ad7780_state *ad_sigma_delta_to_ad7780(struct ad_sigma_delta *sd) -{ - return container_of(sd, struct ad7780_state, sd); -} - -static int ad7780_set_mode(struct ad_sigma_delta *sigma_delta, - enum ad_sigma_delta_mode mode) -{ - struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); - unsigned int val; - - switch (mode) { - case AD_SD_MODE_SINGLE: - case AD_SD_MODE_CONTINUOUS: - val = 1; - break; - default: - val = 0; - break; - } - - gpiod_set_value(st->powerdown_gpio, val); - - return 0; -} - -static int ad7780_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, - int *val2, - long m) -{ - struct ad7780_state *st = iio_priv(indio_dev); - int voltage_uv; - - switch (m) { - case IIO_CHAN_INFO_RAW: - return ad_sigma_delta_single_conversion(indio_dev, chan, val); - case IIO_CHAN_INFO_SCALE: - voltage_uv = regulator_get_voltage(st->reg); - if (voltage_uv < 0) - return voltage_uv; - voltage_uv /= 1000; - *val = voltage_uv * st->gain; - *val2 = chan->scan_type.realbits - 1; - st->int_vref_mv = voltage_uv; - return IIO_VAL_FRACTIONAL_LOG2; - case IIO_CHAN_INFO_OFFSET: - *val = -(1 << (chan->scan_type.realbits - 1)); - return IIO_VAL_INT; - case IIO_CHAN_INFO_SAMP_FREQ: - *val = st->odr; - return IIO_VAL_INT; - default: - break; - } - - return -EINVAL; -} - -static int ad7780_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, - int val2, - long m) -{ - struct ad7780_state *st = iio_priv(indio_dev); - const struct ad7780_chip_info *chip_info = st->chip_info; - unsigned long long vref; - unsigned int full_scale, gain; - - if (!chip_info->is_ad778x) - return -EINVAL; - - switch (m) { - case IIO_CHAN_INFO_SCALE: - if (val != 0) - return -EINVAL; - - vref = st->int_vref_mv * 1000000LL; - full_scale = 1 << (chip_info->channel.scan_type.realbits - 1); - gain = DIV_ROUND_CLOSEST(vref, full_scale); - gain = DIV_ROUND_CLOSEST(gain, val2); - st->gain = gain; - if (gain < AD7780_GAIN_MIDPOINT) - gain = 0; - else - gain = 1; - gpiod_set_value(st->gain_gpio, gain); - break; - case IIO_CHAN_INFO_SAMP_FREQ: - if (1000*val + val2/1000 < AD7780_FILTER_MIDPOINT) - val = 0; - else - val = 1; - st->odr = ad778x_odr_avail[val]; - gpiod_set_value(st->filter_gpio, val); - break; - default: - break; - } - - return 0; -} - -static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta, - unsigned int raw_sample) -{ - struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); - const struct ad7780_chip_info *chip_info = st->chip_info; - - if ((raw_sample & AD7780_ERR) || - ((raw_sample & chip_info->pattern_mask) != chip_info->pattern)) - return -EIO; - - if (chip_info->is_ad778x) { - st->gain = ad778x_gain[raw_sample & AD7780_GAIN]; - st->odr = ad778x_odr_avail[raw_sample & AD7780_FILTER]; - } - - return 0; -} - -static const struct ad_sigma_delta_info ad7780_sigma_delta_info = { - .set_mode = ad7780_set_mode, - .postprocess_sample = ad7780_postprocess_sample, - .has_registers = false, -}; - -#define AD7780_CHANNEL(bits, wordsize) \ - AD_SD_CHANNEL(1, 0, 0, bits, 32, wordsize - bits) -#define AD7170_CHANNEL(bits, wordsize) \ - AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits) - -static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { - [ID_AD7170] = { - .channel = AD7170_CHANNEL(12, 24), - .pattern = AD7170_PATTERN_GOOD, - .pattern_mask = AD7170_PATTERN_MASK, - .is_ad778x = false, - }, - [ID_AD7171] = { - .channel = AD7170_CHANNEL(16, 24), - .pattern = AD7170_PATTERN_GOOD, - .pattern_mask = AD7170_PATTERN_MASK, - .is_ad778x = false, - }, - [ID_AD7780] = { - .channel = AD7780_CHANNEL(24, 32), - .pattern = AD7780_PATTERN_GOOD, - .pattern_mask = AD7780_PATTERN_MASK, - .is_ad778x = true, - }, - [ID_AD7781] = { - .channel = AD7780_CHANNEL(20, 32), - .pattern = AD7780_PATTERN_GOOD, - .pattern_mask = AD7780_PATTERN_MASK, - .is_ad778x = true, - }, -}; - -static const struct iio_info ad7780_info = { - .read_raw = ad7780_read_raw, - .write_raw = ad7780_write_raw, -}; - -static int ad7780_init_gpios(struct device *dev, struct ad7780_state *st) -{ - int ret; - - st->powerdown_gpio = devm_gpiod_get_optional(dev, - "powerdown", - GPIOD_OUT_LOW); - if (IS_ERR(st->powerdown_gpio)) { - ret = PTR_ERR(st->powerdown_gpio); - dev_err(dev, "Failed to request powerdown GPIO: %d\n", ret); - return ret; - } - - if (!st->chip_info->is_ad778x) - return 0; - - - st->gain_gpio = devm_gpiod_get_optional(dev, - "adi,gain", - GPIOD_OUT_HIGH); - if (IS_ERR(st->gain_gpio)) { - ret = PTR_ERR(st->gain_gpio); - dev_err(dev, "Failed to request gain GPIO: %d\n", ret); - return ret; - } - - st->filter_gpio = devm_gpiod_get_optional(dev, - "adi,filter", - GPIOD_OUT_HIGH); - if (IS_ERR(st->filter_gpio)) { - ret = PTR_ERR(st->filter_gpio); - dev_err(dev, "Failed to request filter GPIO: %d\n", ret); - return ret; - } - - return 0; -} - -static int ad7780_probe(struct spi_device *spi) -{ - struct ad7780_state *st; - struct iio_dev *indio_dev; - int ret; - - indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); - if (!indio_dev) - return -ENOMEM; - - st = iio_priv(indio_dev); - st->gain = 1; - - ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info); - - st->chip_info = - &ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data]; - - spi_set_drvdata(spi, indio_dev); - - indio_dev->dev.parent = &spi->dev; - indio_dev->name = spi_get_device_id(spi)->name; - indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = &st->chip_info->channel; - indio_dev->num_channels = 1; - indio_dev->info = &ad7780_info; - - ret = ad7780_init_gpios(&spi->dev, st); - if (ret) - goto error_cleanup_buffer_and_trigger; - - st->reg = devm_regulator_get(&spi->dev, "avdd"); - if (IS_ERR(st->reg)) - return PTR_ERR(st->reg); - - ret = regulator_enable(st->reg); - if (ret) { - dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); - return ret; - } - - ret = ad_sd_setup_buffer_and_trigger(indio_dev); - if (ret) - goto error_disable_reg; - - ret = iio_device_register(indio_dev); - if (ret) - goto error_cleanup_buffer_and_trigger; - - return 0; - -error_cleanup_buffer_and_trigger: - ad_sd_cleanup_buffer_and_trigger(indio_dev); -error_disable_reg: - regulator_disable(st->reg); - - return ret; -} - -static int ad7780_remove(struct spi_device *spi) -{ - struct iio_dev *indio_dev = spi_get_drvdata(spi); - struct ad7780_state *st = iio_priv(indio_dev); - - iio_device_unregister(indio_dev); - ad_sd_cleanup_buffer_and_trigger(indio_dev); - - regulator_disable(st->reg); - - return 0; -} - -static const struct spi_device_id ad7780_id[] = { - {"ad7170", ID_AD7170}, - {"ad7171", ID_AD7171}, - {"ad7780", ID_AD7780}, - {"ad7781", ID_AD7781}, - {} -}; -MODULE_DEVICE_TABLE(spi, ad7780_id); - -static struct spi_driver ad7780_driver = { - .driver = { - .name = "ad7780", - }, - .probe = ad7780_probe, - .remove = ad7780_remove, - .id_table = ad7780_id, -}; -module_spi_driver(ad7780_driver); - -MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); -MODULE_DESCRIPTION("Analog Devices AD7780 and similar ADCs"); -MODULE_LICENSE("GPL v2");