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linux/drivers/iio/adc/ad799x.c
Florian Boor 6b104e7895 iio: adc: ad799x: Implement selecting external reference voltage input on AD7991, AD7995 and AD7999. 
Make use of the AD7991_REF_SEL bit and support using the external
reference voltage if 'vref-supply' is present. Use VCC voltage supply
as reference if no extra reference is supplied.

Signed-off-by: Florian Boor <florian.boor@kernelconcepts.de>
Link: https://lore.kernel.org/r/20210930104249.2924336-1-florian.boor@kernelconcepts.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-10-19 08:30:43 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* iio/adc/ad799x.c
* Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
*
* based on iio/adc/max1363
* Copyright (C) 2008-2010 Jonathan Cameron
*
* based on linux/drivers/i2c/chips/max123x
* Copyright (C) 2002-2004 Stefan Eletzhofer
*
* based on linux/drivers/acron/char/pcf8583.c
* Copyright (C) 2000 Russell King
*
* ad799x.c
*
* Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
* ad7998 and similar chips.
*/
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#define AD799X_CHANNEL_SHIFT 4
/*
* AD7991, AD7995 and AD7999 defines
*/
#define AD7991_REF_SEL 0x08
#define AD7991_FLTR 0x04
#define AD7991_BIT_TRIAL_DELAY 0x02
#define AD7991_SAMPLE_DELAY 0x01
/*
* AD7992, AD7993, AD7994, AD7997 and AD7998 defines
*/
#define AD7998_FLTR BIT(3)
#define AD7998_ALERT_EN BIT(2)
#define AD7998_BUSY_ALERT BIT(1)
#define AD7998_BUSY_ALERT_POL BIT(0)
#define AD7998_CONV_RES_REG 0x0
#define AD7998_ALERT_STAT_REG 0x1
#define AD7998_CONF_REG 0x2
#define AD7998_CYCLE_TMR_REG 0x3
#define AD7998_DATALOW_REG(x) ((x) * 3 + 0x4)
#define AD7998_DATAHIGH_REG(x) ((x) * 3 + 0x5)
#define AD7998_HYST_REG(x) ((x) * 3 + 0x6)
#define AD7998_CYC_MASK GENMASK(2, 0)
#define AD7998_CYC_DIS 0x0
#define AD7998_CYC_TCONF_32 0x1
#define AD7998_CYC_TCONF_64 0x2
#define AD7998_CYC_TCONF_128 0x3
#define AD7998_CYC_TCONF_256 0x4
#define AD7998_CYC_TCONF_512 0x5
#define AD7998_CYC_TCONF_1024 0x6
#define AD7998_CYC_TCONF_2048 0x7
#define AD7998_ALERT_STAT_CLEAR 0xFF
/*
* AD7997 and AD7997 defines
*/
#define AD7997_8_READ_SINGLE BIT(7)
#define AD7997_8_READ_SEQUENCE (BIT(6) | BIT(5) | BIT(4))
enum {
ad7991,
ad7995,
ad7999,
ad7992,
ad7993,
ad7994,
ad7997,
ad7998
};
/**
* struct ad799x_chip_config - chip specific information
* @channel: channel specification
* @default_config: device default configuration
* @info: pointer to iio_info struct
*/
struct ad799x_chip_config {
const struct iio_chan_spec channel[9];
u16 default_config;
const struct iio_info *info;
};
/**
* struct ad799x_chip_info - chip specific information
* @num_channels: number of channels
* @noirq_config: device configuration w/o IRQ
* @irq_config: device configuration w/IRQ
*/
struct ad799x_chip_info {
int num_channels;
const struct ad799x_chip_config noirq_config;
const struct ad799x_chip_config irq_config;
};
struct ad799x_state {
struct i2c_client *client;
const struct ad799x_chip_config *chip_config;
struct regulator *reg;
struct regulator *vref;
unsigned id;
u16 config;
u8 *rx_buf;
unsigned int transfer_size;
};
static int ad799x_write_config(struct ad799x_state *st, u16 val)
{
switch (st->id) {
case ad7997:
case ad7998:
return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
val);
case ad7992:
case ad7993:
case ad7994:
return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
val);
default:
/* Will be written when doing a conversion */
st->config = val;
return 0;
}
}
static int ad799x_read_config(struct ad799x_state *st)
{
switch (st->id) {
case ad7997:
case ad7998:
return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
case ad7992:
case ad7993:
case ad7994:
return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
default:
/* No readback support */
return st->config;
}
}
static int ad799x_update_config(struct ad799x_state *st, u16 config)
{
int ret;
ret = ad799x_write_config(st, config);
if (ret < 0)
return ret;
ret = ad799x_read_config(st);
if (ret < 0)
return ret;
st->config = ret;
return 0;
}
static irqreturn_t ad799x_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct ad799x_state *st = iio_priv(indio_dev);
int b_sent;
u8 cmd;
switch (st->id) {
case ad7991:
case ad7995:
case ad7999:
cmd = st->config |
(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
break;
case ad7992:
case ad7993:
case ad7994:
cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
AD7998_CONV_RES_REG;
break;
case ad7997:
case ad7998:
cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
break;
default:
cmd = 0;
}
b_sent = i2c_smbus_read_i2c_block_data(st->client,
cmd, st->transfer_size, st->rx_buf);
if (b_sent < 0)
goto out;
iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
iio_get_time_ns(indio_dev));
out:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
const unsigned long *scan_mask)
{
struct ad799x_state *st = iio_priv(indio_dev);
kfree(st->rx_buf);
st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
if (!st->rx_buf)
return -ENOMEM;
st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
switch (st->id) {
case ad7992:
case ad7993:
case ad7994:
case ad7997:
case ad7998:
st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
return ad799x_write_config(st, st->config);
default:
return 0;
}
}
static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
{
u8 cmd;
switch (st->id) {
case ad7991:
case ad7995:
case ad7999:
cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
break;
case ad7992:
case ad7993:
case ad7994:
cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
break;
case ad7997:
case ad7998:
cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
break;
default:
return -EINVAL;
}
return i2c_smbus_read_word_swapped(st->client, cmd);
}
static int ad799x_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
int ret;
struct ad799x_state *st = iio_priv(indio_dev);
switch (m) {
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = ad799x_scan_direct(st, chan->scan_index);
iio_device_release_direct_mode(indio_dev);
if (ret < 0)
return ret;
*val = (ret >> chan->scan_type.shift) &
GENMASK(chan->scan_type.realbits - 1, 0);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
if (st->vref)
ret = regulator_get_voltage(st->vref);
else
ret = regulator_get_voltage(st->reg);
if (ret < 0)
return ret;
*val = ret / 1000;
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
}
return -EINVAL;
}
static const unsigned int ad7998_frequencies[] = {
[AD7998_CYC_DIS] = 0,
[AD7998_CYC_TCONF_32] = 15625,
[AD7998_CYC_TCONF_64] = 7812,
[AD7998_CYC_TCONF_128] = 3906,
[AD7998_CYC_TCONF_512] = 976,
[AD7998_CYC_TCONF_1024] = 488,
[AD7998_CYC_TCONF_2048] = 244,
};
static ssize_t ad799x_read_frequency(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad799x_state *st = iio_priv(indio_dev);
int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
if (ret < 0)
return ret;
return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
}
static ssize_t ad799x_write_frequency(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad799x_state *st = iio_priv(indio_dev);
long val;
int ret, i;
ret = kstrtol(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&indio_dev->mlock);
ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
if (ret < 0)
goto error_ret_mutex;
/* Wipe the bits clean */
ret &= ~AD7998_CYC_MASK;
for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
if (val == ad7998_frequencies[i])
break;
if (i == ARRAY_SIZE(ad7998_frequencies)) {
ret = -EINVAL;
goto error_ret_mutex;
}
ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
ret | i);
if (ret < 0)
goto error_ret_mutex;
ret = len;
error_ret_mutex:
mutex_unlock(&indio_dev->mlock);
return ret;
}
static int ad799x_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir)
{
struct ad799x_state *st = iio_priv(indio_dev);
if (!(st->config & AD7998_ALERT_EN))
return 0;
if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
return 1;
return 0;
}
static int ad799x_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
int state)
{
struct ad799x_state *st = iio_priv(indio_dev);
int ret;
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
if (state)
st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
else
st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
if (st->config >> AD799X_CHANNEL_SHIFT)
st->config |= AD7998_ALERT_EN;
else
st->config &= ~AD7998_ALERT_EN;
ret = ad799x_write_config(st, st->config);
iio_device_release_direct_mode(indio_dev);
return ret;
}
static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
enum iio_event_direction dir,
enum iio_event_info info)
{
switch (info) {
case IIO_EV_INFO_VALUE:
if (dir == IIO_EV_DIR_FALLING)
return AD7998_DATALOW_REG(chan->channel);
else
return AD7998_DATAHIGH_REG(chan->channel);
case IIO_EV_INFO_HYSTERESIS:
return AD7998_HYST_REG(chan->channel);
default:
return -EINVAL;
}
return 0;
}
static int ad799x_write_event_value(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int val, int val2)
{
int ret;
struct ad799x_state *st = iio_priv(indio_dev);
if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
return -EINVAL;
mutex_lock(&indio_dev->mlock);
ret = i2c_smbus_write_word_swapped(st->client,
ad799x_threshold_reg(chan, dir, info),
val << chan->scan_type.shift);
mutex_unlock(&indio_dev->mlock);
return ret;
}
static int ad799x_read_event_value(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int *val, int *val2)
{
int ret;
struct ad799x_state *st = iio_priv(indio_dev);
mutex_lock(&indio_dev->mlock);
ret = i2c_smbus_read_word_swapped(st->client,
ad799x_threshold_reg(chan, dir, info));
mutex_unlock(&indio_dev->mlock);
if (ret < 0)
return ret;
*val = (ret >> chan->scan_type.shift) &
GENMASK(chan->scan_type.realbits - 1, 0);
return IIO_VAL_INT;
}
static irqreturn_t ad799x_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct ad799x_state *st = iio_priv(private);
int i, ret;
ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
if (ret <= 0)
goto done;
if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
AD7998_ALERT_STAT_CLEAR) < 0)
goto done;
for (i = 0; i < 8; i++) {
if (ret & BIT(i))
iio_push_event(indio_dev,
i & 0x1 ?
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
(i >> 1),
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_RISING) :
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
(i >> 1),
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_FALLING),
iio_get_time_ns(indio_dev));
}
done:
return IRQ_HANDLED;
}
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
ad799x_read_frequency,
ad799x_write_frequency);
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
static struct attribute *ad799x_event_attributes[] = {
&iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static const struct attribute_group ad799x_event_attrs_group = {
.attrs = ad799x_event_attributes,
};
static const struct iio_info ad7991_info = {
.read_raw = &ad799x_read_raw,
.update_scan_mode = ad799x_update_scan_mode,
};
static const struct iio_info ad7993_4_7_8_noirq_info = {
.read_raw = &ad799x_read_raw,
.update_scan_mode = ad799x_update_scan_mode,
};
static const struct iio_info ad7993_4_7_8_irq_info = {
.read_raw = &ad799x_read_raw,
.event_attrs = &ad799x_event_attrs_group,
.read_event_config = &ad799x_read_event_config,
.write_event_config = &ad799x_write_event_config,
.read_event_value = &ad799x_read_event_value,
.write_event_value = &ad799x_write_event_value,
.update_scan_mode = ad799x_update_scan_mode,
};
static const struct iio_event_spec ad799x_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 _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = (_index), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.scan_index = (_index), \
.scan_type = { \
.sign = 'u', \
.realbits = (_realbits), \
.storagebits = 16, \
.shift = 12 - (_realbits), \
.endianness = IIO_BE, \
}, \
.event_spec = _ev_spec, \
.num_event_specs = _num_ev_spec, \
}
#define AD799X_CHANNEL(_index, _realbits) \
_AD799X_CHANNEL(_index, _realbits, NULL, 0)
#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
ARRAY_SIZE(ad799x_events))
static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
[ad7991] = {
.num_channels = 5,
.noirq_config = {
.channel = {
AD799X_CHANNEL(0, 12),
AD799X_CHANNEL(1, 12),
AD799X_CHANNEL(2, 12),
AD799X_CHANNEL(3, 12),
IIO_CHAN_SOFT_TIMESTAMP(4),
},
.info = &ad7991_info,
},
},
[ad7995] = {
.num_channels = 5,
.noirq_config = {
.channel = {
AD799X_CHANNEL(0, 10),
AD799X_CHANNEL(1, 10),
AD799X_CHANNEL(2, 10),
AD799X_CHANNEL(3, 10),
IIO_CHAN_SOFT_TIMESTAMP(4),
},
.info = &ad7991_info,
},
},
[ad7999] = {
.num_channels = 5,
.noirq_config = {
.channel = {
AD799X_CHANNEL(0, 8),
AD799X_CHANNEL(1, 8),
AD799X_CHANNEL(2, 8),
AD799X_CHANNEL(3, 8),
IIO_CHAN_SOFT_TIMESTAMP(4),
},
.info = &ad7991_info,
},
},
[ad7992] = {
.num_channels = 3,
.noirq_config = {
.channel = {
AD799X_CHANNEL(0, 12),
AD799X_CHANNEL(1, 12),
IIO_CHAN_SOFT_TIMESTAMP(3),
},
.info = &ad7993_4_7_8_noirq_info,
},
.irq_config = {
.channel = {
AD799X_CHANNEL_WITH_EVENTS(0, 12),
AD799X_CHANNEL_WITH_EVENTS(1, 12),
IIO_CHAN_SOFT_TIMESTAMP(3),
},
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
.info = &ad7993_4_7_8_irq_info,
},
},
[ad7993] = {
.num_channels = 5,
.noirq_config = {
.channel = {
AD799X_CHANNEL(0, 10),
AD799X_CHANNEL(1, 10),
AD799X_CHANNEL(2, 10),
AD799X_CHANNEL(3, 10),
IIO_CHAN_SOFT_TIMESTAMP(4),
},
.info = &ad7993_4_7_8_noirq_info,
},
.irq_config = {
.channel = {
AD799X_CHANNEL_WITH_EVENTS(0, 10),
AD799X_CHANNEL_WITH_EVENTS(1, 10),
AD799X_CHANNEL_WITH_EVENTS(2, 10),
AD799X_CHANNEL_WITH_EVENTS(3, 10),
IIO_CHAN_SOFT_TIMESTAMP(4),
},
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
.info = &ad7993_4_7_8_irq_info,
},
},
[ad7994] = {
.num_channels = 5,
.noirq_config = {
.channel = {
AD799X_CHANNEL(0, 12),
AD799X_CHANNEL(1, 12),
AD799X_CHANNEL(2, 12),
AD799X_CHANNEL(3, 12),
IIO_CHAN_SOFT_TIMESTAMP(4),
},
.info = &ad7993_4_7_8_noirq_info,
},
.irq_config = {
.channel = {
AD799X_CHANNEL_WITH_EVENTS(0, 12),
AD799X_CHANNEL_WITH_EVENTS(1, 12),
AD799X_CHANNEL_WITH_EVENTS(2, 12),
AD799X_CHANNEL_WITH_EVENTS(3, 12),
IIO_CHAN_SOFT_TIMESTAMP(4),
},
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
.info = &ad7993_4_7_8_irq_info,
},
},
[ad7997] = {
.num_channels = 9,
.noirq_config = {
.channel = {
AD799X_CHANNEL(0, 10),
AD799X_CHANNEL(1, 10),
AD799X_CHANNEL(2, 10),
AD799X_CHANNEL(3, 10),
AD799X_CHANNEL(4, 10),
AD799X_CHANNEL(5, 10),
AD799X_CHANNEL(6, 10),
AD799X_CHANNEL(7, 10),
IIO_CHAN_SOFT_TIMESTAMP(8),
},
.info = &ad7993_4_7_8_noirq_info,
},
.irq_config = {
.channel = {
AD799X_CHANNEL_WITH_EVENTS(0, 10),
AD799X_CHANNEL_WITH_EVENTS(1, 10),
AD799X_CHANNEL_WITH_EVENTS(2, 10),
AD799X_CHANNEL_WITH_EVENTS(3, 10),
AD799X_CHANNEL(4, 10),
AD799X_CHANNEL(5, 10),
AD799X_CHANNEL(6, 10),
AD799X_CHANNEL(7, 10),
IIO_CHAN_SOFT_TIMESTAMP(8),
},
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
.info = &ad7993_4_7_8_irq_info,
},
},
[ad7998] = {
.num_channels = 9,
.noirq_config = {
.channel = {
AD799X_CHANNEL(0, 12),
AD799X_CHANNEL(1, 12),
AD799X_CHANNEL(2, 12),
AD799X_CHANNEL(3, 12),
AD799X_CHANNEL(4, 12),
AD799X_CHANNEL(5, 12),
AD799X_CHANNEL(6, 12),
AD799X_CHANNEL(7, 12),
IIO_CHAN_SOFT_TIMESTAMP(8),
},
.info = &ad7993_4_7_8_noirq_info,
},
.irq_config = {
.channel = {
AD799X_CHANNEL_WITH_EVENTS(0, 12),
AD799X_CHANNEL_WITH_EVENTS(1, 12),
AD799X_CHANNEL_WITH_EVENTS(2, 12),
AD799X_CHANNEL_WITH_EVENTS(3, 12),
AD799X_CHANNEL(4, 12),
AD799X_CHANNEL(5, 12),
AD799X_CHANNEL(6, 12),
AD799X_CHANNEL(7, 12),
IIO_CHAN_SOFT_TIMESTAMP(8),
},
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
.info = &ad7993_4_7_8_irq_info,
},
},
};
static int ad799x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
int extra_config = 0;
struct ad799x_state *st;
struct iio_dev *indio_dev;
const struct ad799x_chip_info *chip_info =
&ad799x_chip_info_tbl[id->driver_data];
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
if (indio_dev == NULL)
return -ENOMEM;
st = iio_priv(indio_dev);
/* this is only used for device removal purposes */
i2c_set_clientdata(client, indio_dev);
st->id = id->driver_data;
if (client->irq > 0 && chip_info->irq_config.info)
st->chip_config = &chip_info->irq_config;
else
st->chip_config = &chip_info->noirq_config;
/* TODO: Add pdata options for filtering and bit delay */
st->reg = devm_regulator_get(&client->dev, "vcc");
if (IS_ERR(st->reg))
return PTR_ERR(st->reg);
ret = regulator_enable(st->reg);
if (ret)
return ret;
/* check if an external reference is supplied */
st->vref = devm_regulator_get_optional(&client->dev, "vref");
if (IS_ERR(st->vref)) {
if (PTR_ERR(st->vref) == -ENODEV) {
st->vref = NULL;
dev_info(&client->dev, "Using VCC reference voltage\n");
} else {
ret = PTR_ERR(st->vref);
goto error_disable_reg;
}
}
if (st->vref) {
/*
* Use external reference voltage if supported by hardware.
* This is optional if voltage / regulator present, use VCC otherwise.
*/
if ((st->id == ad7991) || (st->id == ad7995) || (st->id == ad7999)) {
dev_info(&client->dev, "Using external reference voltage\n");
extra_config |= AD7991_REF_SEL;
ret = regulator_enable(st->vref);
if (ret)
goto error_disable_reg;
} else {
st->vref = NULL;
dev_warn(&client->dev, "Supplied reference not supported\n");
}
}
st->client = client;
indio_dev->name = id->name;
indio_dev->info = st->chip_config->info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = st->chip_config->channel;
indio_dev->num_channels = chip_info->num_channels;
ret = ad799x_update_config(st, st->chip_config->default_config | extra_config);
if (ret)
goto error_disable_vref;
ret = iio_triggered_buffer_setup(indio_dev, NULL,
&ad799x_trigger_handler, NULL);
if (ret)
goto error_disable_vref;
if (client->irq > 0) {
ret = devm_request_threaded_irq(&client->dev,
client->irq,
NULL,
ad799x_event_handler,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
client->name,
indio_dev);
if (ret)
goto error_cleanup_ring;
}
ret = iio_device_register(indio_dev);
if (ret)
goto error_cleanup_ring;
return 0;
error_cleanup_ring:
iio_triggered_buffer_cleanup(indio_dev);
error_disable_vref:
if (st->vref)
regulator_disable(st->vref);
error_disable_reg:
regulator_disable(st->reg);
return ret;
}
static int ad799x_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct ad799x_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
if (st->vref)
regulator_disable(st->vref);
regulator_disable(st->reg);
kfree(st->rx_buf);
return 0;
}
static int __maybe_unused ad799x_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct ad799x_state *st = iio_priv(indio_dev);
if (st->vref)
regulator_disable(st->vref);
regulator_disable(st->reg);
return 0;
}
static int __maybe_unused ad799x_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct ad799x_state *st = iio_priv(indio_dev);
int ret;
ret = regulator_enable(st->reg);
if (ret) {
dev_err(dev, "Unable to enable vcc regulator\n");
return ret;
}
if (st->vref) {
ret = regulator_enable(st->vref);
if (ret) {
regulator_disable(st->reg);
dev_err(dev, "Unable to enable vref regulator\n");
return ret;
}
}
/* resync config */
ret = ad799x_update_config(st, st->config);
if (ret) {
if (st->vref)
regulator_disable(st->vref);
regulator_disable(st->reg);
return ret;
}
return 0;
}
static SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
static const struct i2c_device_id ad799x_id[] = {
{ "ad7991", ad7991 },
{ "ad7995", ad7995 },
{ "ad7999", ad7999 },
{ "ad7992", ad7992 },
{ "ad7993", ad7993 },
{ "ad7994", ad7994 },
{ "ad7997", ad7997 },
{ "ad7998", ad7998 },
{}
};
MODULE_DEVICE_TABLE(i2c, ad799x_id);
static struct i2c_driver ad799x_driver = {
.driver = {
.name = "ad799x",
.pm = &ad799x_pm_ops,
},
.probe = ad799x_probe,
.remove = ad799x_remove,
.id_table = ad799x_id,
};
module_i2c_driver(ad799x_driver);
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD799x ADC");
MODULE_LICENSE("GPL v2");
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