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path: root/drivers/staging/iio/adc/ad7780.c
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Diffstat (limited to 'drivers/staging/iio/adc/ad7780.c')
-rw-r--r--drivers/staging/iio/adc/ad7780.c277
1 files changed, 0 insertions, 277 deletions
diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
deleted file mode 100644
index c4a85789c2db..000000000000
--- a/drivers/staging/iio/adc/ad7780.c
+++ /dev/null
@@ -1,277 +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)
-
-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;
- 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_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) {
- if (raw_sample & AD7780_GAIN)
- 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 AD7780_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 = AD7780_CHANNEL(12, 24),
- .pattern = AD7170_PATTERN,
- .pattern_mask = AD7170_PATTERN_MASK,
- .is_ad778x = false,
- },
- [ID_AD7171] = {
- .channel = AD7780_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,
-};
-
-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;
- }
-
- 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");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.