[PATCH 2/2] staging: iio: ad7780: Moving ad7780 out of staging

Giuliano Belinassi
2018-11-28T18:16:44Z

Move ad7780 sigma-delta adc out of staging to the main tree

Signed-off-by: Giuliano Belinassi <giuliano.belinassi@usp.br>
Signed-off-by: Renato Lui Geh <renatogeh@gmail.com>
---
drivers/iio/adc/Kconfig | 13 ++
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ad7780.c | 347 +++++++++++++++++++++++++++++++
drivers/staging/iio/adc/Kconfig | 13 --
drivers/staging/iio/adc/Makefile | 1 -
drivers/staging/iio/adc/ad7780.c | 347 -------------------------------
6 files changed, 361 insertions(+), 361 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 575bf69fea57..e517425e364d 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -92,6 +92,19 @@ config AD7793
To compile this driver as a module, choose M here: the
module will be called AD7793.

+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 AD7887
tristate "Analog Devices AD7887 ADC driver"
depends on SPI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 91ba28aeb150..3301ca10b385 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_AD7298) += ad7298.o
obj-$(CONFIG_AD7923) += ad7923.o
obj-$(CONFIG_AD7476) += ad7476.o
obj-$(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..05979a79fda3
--- /dev/null
+++ b/drivers/iio/adc/ad7780.c
@@ -0,0 +1,347 @@
+/*
+ * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#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/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 AD7780_PAT1 BIT(1)
+#define AD7780_PAT0 BIT(0)
+
+#define AD7780_PATTERN (AD7780_PAT0)
+#define AD7780_PATTERN_MASK (AD7780_PAT0 | AD7780_PAT1)
+
+#define AD7170_PAT2 BIT(2)
+
+#define AD7170_PATTERN (AD7780_PAT0 | AD7170_PAT2)
+#define AD7170_PATTERN_MASK (AD7780_PAT0 | AD7780_PAT1 | AD7170_PAT2)
+
+#define AD7780_GAIN_GPIO 0
+#define AD7780_FILTER_GPIO 1
+
+#define AD7780_GAIN_MIDPOINT 64
+#define AD7780_FILTER_MIDPOINT 13350
+
+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;
+
+ 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;
+ *val = (voltage_uv / 1000) * st->gain;
+ *val2 = chan->scan_type.realbits - 1;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ case IIO_CHAN_INFO_OFFSET:
+ *val = -(1 << (chan->scan_type.realbits - 1));
+ return IIO_VAL_INT;
+ }
+
+ 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;
+ int uvref, gain;
+ unsigned int full_scale;
+
+ if (!chip_info->is_ad778x)
+ return 0;
+
+ switch (m) {
+ case IIO_CHAN_INFO_SCALE:
+ if (val != 0)
+ return -EINVAL;
+
+ uvref = regulator_get_voltage(st->reg);
+
+ if (uvref < 0)
+ return uvref;
+
+ full_scale = 1 << (chip_info->channel.scan_type.realbits - 1);
+ gain = DIV_ROUND_CLOSEST(uvref, full_scale);
+ gain = DIV_ROUND_CLOSEST(gain, val2);
+
+ gpiod_set_value(st->gain_gpio, gain < AD7780_GAIN_MIDPOINT ? 0 : 1);
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ if (val2 != 0)
+ return -EINVAL;
+
+ gpiod_set_value(st->filter_gpio, val < AD7780_FILTER_MIDPOINT ? 0 : 1);
+ 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;
+ int val;
+
+ if ((raw_sample & AD7780_ERR) ||
+ ((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
+ return -EIO;
+
+ if (chip_info->is_ad778x) {
+ val = raw_sample & AD7780_GAIN;
+
+ if (val != gpiod_get_value(st->gain_gpio))
+ return -EIO;
+
+ if (val)
+ st->gain = 1;
+ else
+ st->gain = 128;
+ }
+
+ 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 AD7170_CHANNEL(bits, wordsize) \
+ AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits)
+#define AD7780_CHANNEL(bits, wordsize) \
+ AD_SD_CHANNEL_GAIN_FILTER(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,
+ .pattern_mask = AD7170_PATTERN_MASK,
+ .is_ad778x = false,
+ },
+ [ID_AD7171] = {
+ .channel = AD7170_CHANNEL(16, 24),
+ .pattern = AD7170_PATTERN,
+ .pattern_mask = AD7170_PATTERN_MASK,
+ .is_ad778x = false,
+ },
+ [ID_AD7780] = {
+ .channel = AD7780_CHANNEL(24, 32),
+ .pattern = AD7780_PATTERN,
+ .pattern_mask = AD7780_PATTERN_MASK,
+ .is_ad778x = true,
+ },
+ [ID_AD7781] = {
+ .channel = AD7780_CHANNEL(20, 32),
+ .pattern = AD7780_PATTERN,
+ .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_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->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;
+ }
+
+ 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;
+
+ st->powerdown_gpio = devm_gpiod_get_optional(&spi->dev,
+ "powerdown",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(st->powerdown_gpio)) {
+ ret = PTR_ERR(st->powerdown_gpio);
+ dev_err(&spi->dev, "Failed to request powerdown GPIO: %d\n",
+ ret);
+ goto error_disable_reg;
+ }
+
+ if (st->chip_info->is_ad778x) {
+ st->gain_gpio = devm_gpiod_get_optional(&spi->dev,
+ "gain",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(st->gain_gpio)) {
+ ret = PTR_ERR(st->gain_gpio);
+ dev_err(&spi->dev, "Failed to request gain GPIO: %d\n",
+ ret);
+ goto error_disable_reg;
+ }
+ }
+
+ 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 fc23059f1673..4cd0a13a588c 100644
--- a/drivers/staging/iio/adc/Kconfig
+++ b/drivers/staging/iio/adc/Kconfig
@@ -37,19 +37,6 @@ config AD7606_IFACE_SPI
To compile this driver as a module, choose M here: the
module will be called ad7606_spi.

-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 ebe83c1ad362..344002d87c78 100644
--- a/drivers/staging/iio/adc/Makefile
+++ b/drivers/staging/iio/adc/Makefile
@@ -7,7 +7,6 @@ obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o
obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
obj-$(CONFIG_AD7606) += ad7606.o

-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 05979a79fda3..000000000000
--- a/drivers/staging/iio/adc/ad7780.c
+++ /dev/null
@@ -1,347 +0,0 @@
-/*
- * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#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/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 AD7780_PAT1 BIT(1)
-#define AD7780_PAT0 BIT(0)
-
-#define AD7780_PATTERN (AD7780_PAT0)
-#define AD7780_PATTERN_MASK (AD7780_PAT0 | AD7780_PAT1)
-
-#define AD7170_PAT2 BIT(2)
-
-#define AD7170_PATTERN (AD7780_PAT0 | AD7170_PAT2)
-#define AD7170_PATTERN_MASK (AD7780_PAT0 | AD7780_PAT1 | AD7170_PAT2)
-
-#define AD7780_GAIN_GPIO 0
-#define AD7780_FILTER_GPIO 1
-
-#define AD7780_GAIN_MIDPOINT 64
-#define AD7780_FILTER_MIDPOINT 13350
-
-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;
-
- 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;
- *val = (voltage_uv / 1000) * st->gain;
- *val2 = chan->scan_type.realbits - 1;
- return IIO_VAL_FRACTIONAL_LOG2;
- case IIO_CHAN_INFO_OFFSET:
- *val = -(1 << (chan->scan_type.realbits - 1));
- return IIO_VAL_INT;
- }
-
- 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;
- int uvref, gain;
- unsigned int full_scale;
-
- if (!chip_info->is_ad778x)
- return 0;
-
- switch (m) {
- case IIO_CHAN_INFO_SCALE:
- if (val != 0)
- return -EINVAL;
-
- uvref = regulator_get_voltage(st->reg);
-
- if (uvref < 0)
- return uvref;
-
- full_scale = 1 << (chip_info->channel.scan_type.realbits - 1);
- gain = DIV_ROUND_CLOSEST(uvref, full_scale);
- gain = DIV_ROUND_CLOSEST(gain, val2);
-
- gpiod_set_value(st->gain_gpio, gain < AD7780_GAIN_MIDPOINT ? 0 : 1);
- break;
- case IIO_CHAN_INFO_SAMP_FREQ:
- if (val2 != 0)
- return -EINVAL;
-
- gpiod_set_value(st->filter_gpio, val < AD7780_FILTER_MIDPOINT ? 0 : 1);
- 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;
- int val;
-
- if ((raw_sample & AD7780_ERR) ||
- ((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
- return -EIO;
-
- if (chip_info->is_ad778x) {
- val = raw_sample & AD7780_GAIN;
-
- if (val != gpiod_get_value(st->gain_gpio))
- return -EIO;
-
- if (val)
- st->gain = 1;
- else
- st->gain = 128;
- }
-
- 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 AD7170_CHANNEL(bits, wordsize) \
- AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits)
-#define AD7780_CHANNEL(bits, wordsize) \
- AD_SD_CHANNEL_GAIN_FILTER(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,
- .pattern_mask = AD7170_PATTERN_MASK,
- .is_ad778x = false,
- },
- [ID_AD7171] = {
- .channel = AD7170_CHANNEL(16, 24),
- .pattern = AD7170_PATTERN,
- .pattern_mask = AD7170_PATTERN_MASK,
- .is_ad778x = false,
- },
- [ID_AD7780] = {
- .channel = AD7780_CHANNEL(24, 32),
- .pattern = AD7780_PATTERN,
- .pattern_mask = AD7780_PATTERN_MASK,
- .is_ad778x = true,
- },
- [ID_AD7781] = {
- .channel = AD7780_CHANNEL(20, 32),
- .pattern = AD7780_PATTERN,
- .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_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->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;
- }
-
- 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;
-
- st->powerdown_gpio = devm_gpiod_get_optional(&spi->dev,
- "powerdown",
- GPIOD_OUT_LOW);
- if (IS_ERR(st->powerdown_gpio)) {
- ret = PTR_ERR(st->powerdown_gpio);
- dev_err(&spi->dev, "Failed to request powerdown GPIO: %d\n",
- ret);
- goto error_disable_reg;
- }
-
- if (st->chip_info->is_ad778x) {
- st->gain_gpio = devm_gpiod_get_optional(&spi->dev,
- "gain",
- GPIOD_OUT_HIGH);
- if (IS_ERR(st->gain_gpio)) {
- ret = PTR_ERR(st->gain_gpio);
- dev_err(&spi->dev, "Failed to request gain GPIO: %d\n",
- ret);
- goto error_disable_reg;
- }
- }
-
- 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");
--
2.19.1