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path: root/drivers/iio/adc/ad7791.c
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Diffstat (limited to 'drivers/iio/adc/ad7791.c')
-rw-r--r--drivers/iio/adc/ad7791.c153
1 files changed, 94 insertions, 59 deletions
diff --git a/drivers/iio/adc/ad7791.c b/drivers/iio/adc/ad7791.c
index a9ff0695ddf7..041fc25e3209 100644
--- a/drivers/iio/adc/ad7791.c
+++ b/drivers/iio/adc/ad7791.c
@@ -1,10 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* AD7787/AD7788/AD7789/AD7790/AD7791 SPI ADC driver
*
* Copyright 2012 Analog Devices Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
- *
- * Licensed under the GPL-2.
*/
#include <linux/interrupt.h>
@@ -65,25 +64,73 @@
#define AD7791_MODE_SEL_MASK (0x3 << 6)
#define AD7791_MODE_SEL(x) ((x) << 6)
+#define __AD7991_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+ _storagebits, _shift, _extend_name, _type, _mask_all) \
+ { \
+ .type = (_type), \
+ .differential = (_channel2 == -1 ? 0 : 1), \
+ .indexed = 1, \
+ .channel = (_channel1), \
+ .channel2 = (_channel2), \
+ .address = (_address), \
+ .extend_name = (_extend_name), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_OFFSET), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .info_mask_shared_by_all = _mask_all, \
+ .scan_index = (_si), \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = (_bits), \
+ .storagebits = (_storagebits), \
+ .shift = (_shift), \
+ .endianness = IIO_BE, \
+ }, \
+ }
+
+#define AD7991_SHORTED_CHANNEL(_si, _channel, _address, _bits, \
+ _storagebits, _shift) \
+ __AD7991_CHANNEL(_si, _channel, _channel, _address, _bits, \
+ _storagebits, _shift, "shorted", IIO_VOLTAGE, \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7991_CHANNEL(_si, _channel, _address, _bits, \
+ _storagebits, _shift) \
+ __AD7991_CHANNEL(_si, _channel, -1, _address, _bits, \
+ _storagebits, _shift, NULL, IIO_VOLTAGE, \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7991_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+ _storagebits, _shift) \
+ __AD7991_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+ _storagebits, _shift, NULL, IIO_VOLTAGE, \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7991_SUPPLY_CHANNEL(_si, _channel, _address, _bits, _storagebits, \
+ _shift) \
+ __AD7991_CHANNEL(_si, _channel, -1, _address, _bits, \
+ _storagebits, _shift, "supply", IIO_VOLTAGE, \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
#define DECLARE_AD7787_CHANNELS(name, bits, storagebits) \
const struct iio_chan_spec name[] = { \
- AD_SD_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
+ AD7991_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
(bits), (storagebits), 0), \
- AD_SD_CHANNEL(1, 1, AD7791_CH_AIN2, (bits), (storagebits), 0), \
- AD_SD_SHORTED_CHANNEL(2, 0, AD7791_CH_AIN1N_AIN1N, \
+ AD7991_CHANNEL(1, 1, AD7791_CH_AIN2, (bits), (storagebits), 0), \
+ AD7991_SHORTED_CHANNEL(2, 0, AD7791_CH_AIN1N_AIN1N, \
(bits), (storagebits), 0), \
- AD_SD_SUPPLY_CHANNEL(3, 2, AD7791_CH_AVDD_MONITOR, \
+ AD7991_SUPPLY_CHANNEL(3, 2, AD7791_CH_AVDD_MONITOR, \
(bits), (storagebits), 0), \
IIO_CHAN_SOFT_TIMESTAMP(4), \
}
#define DECLARE_AD7791_CHANNELS(name, bits, storagebits) \
const struct iio_chan_spec name[] = { \
- AD_SD_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
+ AD7991_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
(bits), (storagebits), 0), \
- AD_SD_SHORTED_CHANNEL(1, 0, AD7791_CH_AIN1N_AIN1N, \
+ AD7991_SHORTED_CHANNEL(1, 0, AD7791_CH_AIN1N_AIN1N, \
(bits), (storagebits), 0), \
- AD_SD_SUPPLY_CHANNEL(2, 1, AD7791_CH_AVDD_MONITOR, \
+ AD7991_SUPPLY_CHANNEL(2, 1, AD7791_CH_AVDD_MONITOR, \
(bits), (storagebits), 0), \
IIO_CHAN_SOFT_TIMESTAMP(3), \
}
@@ -206,6 +253,8 @@ static const struct ad_sigma_delta_info ad7791_sigma_delta_info = {
.has_registers = true,
.addr_shift = 4,
.read_mask = BIT(3),
+ .irq_flags = IRQF_TRIGGER_FALLING,
+ .num_resetclks = 32,
};
static int ad7791_read_raw(struct iio_dev *indio_dev,
@@ -261,15 +310,11 @@ static int ad7791_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
-static int ad7791_write_raw(struct iio_dev *indio_dev,
+static int __ad7791_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val, int val2, long mask)
{
struct ad7791_state *st = iio_priv(indio_dev);
- int ret, i;
-
- ret = iio_device_claim_direct_mode(indio_dev);
- if (ret)
- return ret;
+ int i;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
@@ -279,22 +324,31 @@ static int ad7791_write_raw(struct iio_dev *indio_dev,
break;
}
- if (i == ARRAY_SIZE(ad7791_sample_freq_avail)) {
- ret = -EINVAL;
- break;
- }
+ if (i == ARRAY_SIZE(ad7791_sample_freq_avail))
+ return -EINVAL;
st->filter &= ~AD7791_FILTER_RATE_MASK;
st->filter |= i;
ad_sd_write_reg(&st->sd, AD7791_REG_FILTER,
sizeof(st->filter),
st->filter);
- break;
+ return 0;
default:
- ret = -EINVAL;
+ return -EINVAL;
}
+}
+
+static int ad7791_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val, int val2, long mask)
+{
+ int ret;
+
+ if (!iio_device_claim_direct(indio_dev))
+ return -EBUSY;
+
+ ret = __ad7791_write_raw(indio_dev, chan, val, val2, mask);
- iio_device_release_direct_mode(indio_dev);
+ iio_device_release_direct(indio_dev);
return ret;
}
@@ -323,7 +377,7 @@ static const struct iio_info ad7791_no_filter_info = {
};
static int ad7791_setup(struct ad7791_state *st,
- struct ad7791_platform_data *pdata)
+ const struct ad7791_platform_data *pdata)
{
/* Set to poweron-reset default values */
st->mode = AD7791_MODE_BUFFER;
@@ -346,9 +400,14 @@ static int ad7791_setup(struct ad7791_state *st,
st->mode);
}
+static void ad7791_reg_disable(void *reg)
+{
+ regulator_disable(reg);
+}
+
static int ad7791_probe(struct spi_device *spi)
{
- struct ad7791_platform_data *pdata = spi->dev.platform_data;
+ const struct ad7791_platform_data *pdata = dev_get_platdata(&spi->dev);
struct iio_dev *indio_dev;
struct ad7791_state *st;
int ret;
@@ -372,13 +431,13 @@ static int ad7791_probe(struct spi_device *spi)
if (ret)
return ret;
+ ret = devm_add_action_or_reset(&spi->dev, ad7791_reg_disable, st->reg);
+ if (ret)
+ return ret;
+
st->info = &ad7791_chip_infos[spi_get_device_id(spi)->driver_data];
ad_sd_init(&st->sd, indio_dev, spi, &ad7791_sigma_delta_info);
- spi_set_drvdata(spi, indio_dev);
-
- indio_dev->dev.parent = &spi->dev;
- indio_dev->dev.of_node = spi->dev.of_node;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = st->info->channels;
@@ -388,39 +447,15 @@ static int ad7791_probe(struct spi_device *spi)
else
indio_dev->info = &ad7791_no_filter_info;
- ret = ad_sd_setup_buffer_and_trigger(indio_dev);
+ ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev);
if (ret)
- goto error_disable_reg;
+ return ret;
ret = ad7791_setup(st, pdata);
if (ret)
- goto error_remove_trigger;
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_remove_trigger;
-
- return 0;
-
-error_remove_trigger:
- ad_sd_cleanup_buffer_and_trigger(indio_dev);
-error_disable_reg:
- regulator_disable(st->reg);
-
- return ret;
-}
-
-static int ad7791_remove(struct spi_device *spi)
-{
- struct iio_dev *indio_dev = spi_get_drvdata(spi);
- struct ad7791_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
- ad_sd_cleanup_buffer_and_trigger(indio_dev);
-
- regulator_disable(st->reg);
+ return ret;
- return 0;
+ return devm_iio_device_register(&spi->dev, indio_dev);
}
static const struct spi_device_id ad7791_spi_ids[] = {
@@ -429,7 +464,7 @@ static const struct spi_device_id ad7791_spi_ids[] = {
{ "ad7789", AD7789 },
{ "ad7790", AD7790 },
{ "ad7791", AD7791 },
- {}
+ { }
};
MODULE_DEVICE_TABLE(spi, ad7791_spi_ids);
@@ -438,11 +473,11 @@ static struct spi_driver ad7791_driver = {
.name = "ad7791",
},
.probe = ad7791_probe,
- .remove = ad7791_remove,
.id_table = ad7791_spi_ids,
};
module_spi_driver(ad7791_driver);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-MODULE_DESCRIPTION("Analog Device AD7787/AD7788/AD7789/AD7790/AD7791 ADC driver");
+MODULE_DESCRIPTION("Analog Devices AD7787/AD7788/AD7789/AD7790/AD7791 ADC driver");
MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS("IIO_AD_SIGMA_DELTA");
generated by cgit (git 2.34.1) at 2025-12-25 10:03:50 +0000