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linux/drivers/iio/adc/ad799x.c
Marco Felsch d93813520d iio: adc: ad799x: add pm_ops to disable the device completely 
The device is always in a low-power state due to the hardware design. It
wakes up upon a conversion request and goes back into the low-power
state. The pm ops are added to disable the device completely and to free
the regulator. Disbaling the device completely should be not that
notable but freeing the regulator is important. Because if it is a shared
power-rail the regulator won't be disabled during suspend-to-ram/disk
and so all devices connected to that rail keeps on.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2019-12-15 11:42:14 +00:00

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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;
}
/**
* ad799x_trigger_handler() bh of trigger launched polling to ring buffer
*
* Currently there is no option in this driver to disable the saving of
* timestamps within the ring.
**/
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:
ret = regulator_get_voltage(st->vref);
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;
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;
st->vref = devm_regulator_get(&client->dev, "vref");
if (IS_ERR(st->vref)) {
ret = PTR_ERR(st->vref);
goto error_disable_reg;
}
ret = regulator_enable(st->vref);
if (ret)
goto error_disable_reg;
st->client = client;
indio_dev->dev.parent = &client->dev;
indio_dev->dev.of_node = client->dev.of_node;
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);
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:
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);
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);
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;
}
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) {
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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