Commit ca693001 authored by Paul Cercueil's avatar Paul Cercueil Committed by Jonathan Cameron

iio: adc: Add support for AD7091R5 ADC

AD7091R5 is 4-Channel, I2C, Ultra Low Power,12-Bit ADC.

This driver will also support AD7091R2/4/8 in the future.

Datasheet:
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7091r-5.pdfSigned-off-by: default avatarPaul Cercueil <paul.cercueil@analog.com>
Co-developed-by: default avatarBeniamin Bia <beniamin.bia@analog.com>
Signed-off-by: default avatarBeniamin Bia <beniamin.bia@analog.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent f339f979
...@@ -32,6 +32,13 @@ config AD7124 ...@@ -32,6 +32,13 @@ config AD7124
To compile this driver as a module, choose M here: the module will be To compile this driver as a module, choose M here: the module will be
called ad7124. called ad7124.
config AD7091R5
tristate "Analog Devices AD7091R5 ADC Driver"
depends on I2C
select REGMAP_I2C
help
Say yes here to build support for Analog Devices AD7091R-5 ADC.
config AD7266 config AD7266
tristate "Analog Devices AD7265/AD7266 ADC driver" tristate "Analog Devices AD7265/AD7266 ADC driver"
depends on SPI_MASTER depends on SPI_MASTER
......
...@@ -7,6 +7,7 @@ ...@@ -7,6 +7,7 @@
obj-$(CONFIG_AB8500_GPADC) += ab8500-gpadc.o obj-$(CONFIG_AB8500_GPADC) += ab8500-gpadc.o
obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
obj-$(CONFIG_AD7124) += ad7124.o obj-$(CONFIG_AD7124) += ad7124.o
obj-$(CONFIG_AD7091R5) += ad7091r5.o ad7091r-base.o
obj-$(CONFIG_AD7266) += ad7266.o obj-$(CONFIG_AD7266) += ad7266.o
obj-$(CONFIG_AD7291) += ad7291.o obj-$(CONFIG_AD7291) += ad7291.o
obj-$(CONFIG_AD7292) += ad7292.o obj-$(CONFIG_AD7292) += ad7292.o
......
// SPDX-License-Identifier: GPL-2.0
/*
* AD7091RX Analog to Digital converter driver
*
* Copyright 2014-2019 Analog Devices Inc.
*/
#include <linux/bitops.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include "ad7091r-base.h"
#define AD7091R_REG_RESULT 0
#define AD7091R_REG_CHANNEL 1
#define AD7091R_REG_CONF 2
#define AD7091R_REG_ALERT 3
#define AD7091R_REG_CH_LOW_LIMIT(ch) ((ch) * 3 + 4)
#define AD7091R_REG_CH_HIGH_LIMIT(ch) ((ch) * 3 + 5)
#define AD7091R_REG_CH_HYSTERESIS(ch) ((ch) * 3 + 6)
/* AD7091R_REG_RESULT */
#define AD7091R_REG_RESULT_CH_ID(x) (((x) >> 13) & 0x3)
#define AD7091R_REG_RESULT_CONV_RESULT(x) ((x) & 0xfff)
/* AD7091R_REG_CONF */
#define AD7091R_REG_CONF_AUTO BIT(8)
#define AD7091R_REG_CONF_CMD BIT(10)
#define AD7091R_REG_CONF_MODE_MASK \
(AD7091R_REG_CONF_AUTO | AD7091R_REG_CONF_CMD)
enum ad7091r_mode {
AD7091R_MODE_SAMPLE,
AD7091R_MODE_COMMAND,
AD7091R_MODE_AUTOCYCLE,
};
struct ad7091r_state {
struct device *dev;
struct regmap *map;
const struct ad7091r_chip_info *chip_info;
enum ad7091r_mode mode;
struct mutex lock; /*lock to prevent concurent reads */
};
static int ad7091r_set_mode(struct ad7091r_state *st, enum ad7091r_mode mode)
{
int ret, conf;
switch (mode) {
case AD7091R_MODE_SAMPLE:
conf = 0;
break;
case AD7091R_MODE_COMMAND:
conf = AD7091R_REG_CONF_CMD;
break;
case AD7091R_MODE_AUTOCYCLE:
conf = AD7091R_REG_CONF_AUTO;
break;
default:
return -EINVAL;
}
ret = regmap_update_bits(st->map, AD7091R_REG_CONF,
AD7091R_REG_CONF_MODE_MASK, conf);
if (ret)
return ret;
st->mode = mode;
return 0;
}
static int ad7091r_set_channel(struct ad7091r_state *st, unsigned int channel)
{
unsigned int dummy;
int ret;
/* AD7091R_REG_CHANNEL specified which channels to be converted */
ret = regmap_write(st->map, AD7091R_REG_CHANNEL,
BIT(channel) | (BIT(channel) << 8));
if (ret)
return ret;
/*
* There is a latency of one conversion before the channel conversion
* sequence is updated
*/
return regmap_read(st->map, AD7091R_REG_RESULT, &dummy);
}
static int ad7091r_read_one(struct iio_dev *iio_dev,
unsigned int channel, unsigned int *read_val)
{
struct ad7091r_state *st = iio_priv(iio_dev);
unsigned int val;
int ret;
ret = ad7091r_set_channel(st, channel);
if (ret)
return ret;
ret = regmap_read(st->map, AD7091R_REG_RESULT, &val);
if (ret)
return ret;
if (AD7091R_REG_RESULT_CH_ID(val) != channel)
return -EIO;
*read_val = AD7091R_REG_RESULT_CONV_RESULT(val);
return 0;
}
static int ad7091r_read_raw(struct iio_dev *iio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long m)
{
struct ad7091r_state *st = iio_priv(iio_dev);
unsigned int read_val;
int ret;
mutex_lock(&st->lock);
switch (m) {
case IIO_CHAN_INFO_RAW:
if (st->mode != AD7091R_MODE_COMMAND) {
ret = -EBUSY;
goto unlock;
}
ret = ad7091r_read_one(iio_dev, chan->channel, &read_val);
if (ret)
goto unlock;
*val = read_val;
ret = IIO_VAL_INT;
break;
default:
ret = -EINVAL;
break;
}
unlock:
mutex_unlock(&st->lock);
return ret;
}
static const struct iio_info ad7091r_info = {
.read_raw = ad7091r_read_raw,
};
static irqreturn_t ad7091r_event_handler(int irq, void *private)
{
struct ad7091r_state *st = (struct ad7091r_state *) private;
struct iio_dev *iio_dev = dev_get_drvdata(st->dev);
unsigned int i, read_val;
int ret;
s64 timestamp = iio_get_time_ns(iio_dev);
ret = regmap_read(st->map, AD7091R_REG_ALERT, &read_val);
if (ret)
return IRQ_HANDLED;
for (i = 0; i < st->chip_info->num_channels; i++) {
if (read_val & BIT(i * 2))
iio_push_event(iio_dev,
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, i,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_RISING), timestamp);
if (read_val & BIT(i * 2 + 1))
iio_push_event(iio_dev,
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, i,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_FALLING), timestamp);
}
return IRQ_HANDLED;
}
int ad7091r_probe(struct device *dev, const char *name,
const struct ad7091r_chip_info *chip_info,
struct regmap *map, int irq)
{
struct iio_dev *iio_dev;
struct ad7091r_state *st;
int ret;
iio_dev = devm_iio_device_alloc(dev, sizeof(*st));
if (!iio_dev)
return -ENOMEM;
st = iio_priv(iio_dev);
st->dev = dev;
st->chip_info = chip_info;
st->map = map;
iio_dev->dev.parent = dev;
iio_dev->name = name;
iio_dev->info = &ad7091r_info;
iio_dev->modes = INDIO_DIRECT_MODE;
iio_dev->num_channels = chip_info->num_channels;
iio_dev->channels = chip_info->channels;
if (irq) {
ret = devm_request_threaded_irq(dev, irq, NULL,
ad7091r_event_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT, name, st);
if (ret)
return ret;
}
/* Use command mode by default to convert only desired channels*/
ret = ad7091r_set_mode(st, AD7091R_MODE_COMMAND);
if (ret)
return ret;
return devm_iio_device_register(dev, iio_dev);
}
EXPORT_SYMBOL_GPL(ad7091r_probe);
static bool ad7091r_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case AD7091R_REG_RESULT:
case AD7091R_REG_ALERT:
return false;
default:
return true;
}
}
static bool ad7091r_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case AD7091R_REG_RESULT:
case AD7091R_REG_ALERT:
return true;
default:
return false;
}
}
const struct regmap_config ad7091r_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.writeable_reg = ad7091r_writeable_reg,
.volatile_reg = ad7091r_volatile_reg,
};
EXPORT_SYMBOL_GPL(ad7091r_regmap_config);
MODULE_AUTHOR("Beniamin Bia <beniamin.bia@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD7091Rx multi-channel converters");
MODULE_LICENSE("GPL v2");
/* SPDX-License-Identifier: GPL-2.0 */
/*
* AD7091RX Analog to Digital converter driver
*
* Copyright 2014-2019 Analog Devices Inc.
*/
#ifndef __DRIVERS_IIO_ADC_AD7091R_BASE_H__
#define __DRIVERS_IIO_ADC_AD7091R_BASE_H__
struct device;
struct ad7091r_state;
struct ad7091r_chip_info {
unsigned int num_channels;
const struct iio_chan_spec *channels;
};
extern const struct regmap_config ad7091r_regmap_config;
int ad7091r_probe(struct device *dev, const char *name,
const struct ad7091r_chip_info *chip_info,
struct regmap *map, int irq);
#endif /* __DRIVERS_IIO_ADC_AD7091R_BASE_H__ */
// SPDX-License-Identifier: GPL-2.0
/*
* AD7091R5 Analog to Digital converter driver
*
* Copyright 2014-2019 Analog Devices Inc.
*/
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include "ad7091r-base.h"
static const struct iio_event_spec ad7091r5_events[] = {
{
.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),
},
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
},
};
#define AD7091R_CHANNEL(idx, bits, ev, num_ev) { \
.type = IIO_VOLTAGE, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.indexed = 1, \
.channel = idx, \
.event_spec = ev, \
.num_event_specs = num_ev, \
}
static const struct iio_chan_spec ad7091r5_channels_irq[] = {
AD7091R_CHANNEL(0, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
AD7091R_CHANNEL(1, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
AD7091R_CHANNEL(2, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
AD7091R_CHANNEL(3, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
};
static const struct iio_chan_spec ad7091r5_channels_noirq[] = {
AD7091R_CHANNEL(0, 12, NULL, 0),
AD7091R_CHANNEL(1, 12, NULL, 0),
AD7091R_CHANNEL(2, 12, NULL, 0),
AD7091R_CHANNEL(3, 12, NULL, 0),
};
static const struct ad7091r_chip_info ad7091r5_chip_info_irq = {
.channels = ad7091r5_channels_irq,
.num_channels = ARRAY_SIZE(ad7091r5_channels_irq),
};
static const struct ad7091r_chip_info ad7091r5_chip_info_noirq = {
.channels = ad7091r5_channels_noirq,
.num_channels = ARRAY_SIZE(ad7091r5_channels_noirq),
};
static int ad7091r5_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
const struct ad7091r_chip_info *chip_info;
struct regmap *map = devm_regmap_init_i2c(i2c, &ad7091r_regmap_config);
if (IS_ERR(map))
return PTR_ERR(map);
if (i2c->irq)
chip_info = &ad7091r5_chip_info_irq;
else
chip_info = &ad7091r5_chip_info_noirq;
return ad7091r_probe(&i2c->dev, id->name, chip_info, map, i2c->irq);
}
static const struct of_device_id ad7091r5_dt_ids[] = {
{ .compatible = "adi,ad7091r5" },
{},
};
MODULE_DEVICE_TABLE(of, ad7091r5_dt_ids);
static const struct i2c_device_id ad7091r5_i2c_ids[] = {
{"ad7091r5", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, ad7091r5_i2c_ids);
static struct i2c_driver ad7091r5_driver = {
.driver = {
.name = "ad7091r5",
.of_match_table = ad7091r5_dt_ids,
},
.probe = ad7091r5_i2c_probe,
.id_table = ad7091r5_i2c_ids,
};
module_i2c_driver(ad7091r5_driver);
MODULE_AUTHOR("Beniamin Bia <beniamin.bia@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD7091R5 multi-channel ADC driver");
MODULE_LICENSE("GPL v2");
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