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linux/drivers/iio/proximity/sx9310.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2018 Google LLC.
*
* Driver for Semtech's SX9310/SX9311 capacitive proximity/button solution.
* Based on SX9500 driver and Semtech driver using the input framework
* <https://my.syncplicity.com/share/teouwsim8niiaud/
* linux-driver-SX9310_NoSmartHSensing>.
* Reworked April 2019 by Evan Green <evgreen@chromium.org>
* and January 2020 by Daniel Campello <campello@chromium.org>
*/
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/iio/buffer.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
/* Register definitions. */
#define SX9310_REG_IRQ_SRC 0x00
#define SX9310_REG_STAT0 0x01
#define SX9310_REG_STAT1 0x02
#define SX9310_REG_IRQ_MSK 0x03
#define SX9310_CONVDONE_IRQ BIT(3)
#define SX9310_FAR_IRQ BIT(5)
#define SX9310_CLOSE_IRQ BIT(6)
#define SX9310_EVENT_IRQ (SX9310_FAR_IRQ | \
SX9310_CLOSE_IRQ)
#define SX9310_REG_IRQ_FUNC 0x04
#define SX9310_REG_PROX_CTRL0 0x10
#define SX9310_REG_PROX_CTRL0_PROXSTAT2 0x10
#define SX9310_REG_PROX_CTRL0_EN_MASK 0x0F
#define SX9310_REG_PROX_CTRL1 0x11
#define SX9310_REG_PROX_CTRL2 0x12
#define SX9310_REG_PROX_CTRL2_COMBMODE_ALL 0x80
#define SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC 0x04
#define SX9310_REG_PROX_CTRL3 0x13
#define SX9310_REG_PROX_CTRL3_GAIN0_X8 0x0c
#define SX9310_REG_PROX_CTRL3_GAIN12_X4 0x02
#define SX9310_REG_PROX_CTRL4 0x14
#define SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST 0x07
#define SX9310_REG_PROX_CTRL5 0x15
#define SX9310_REG_PROX_CTRL5_RANGE_SMALL 0xc0
#define SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 0x04
#define SX9310_REG_PROX_CTRL5_RAWFILT_1P25 0x02
#define SX9310_REG_PROX_CTRL6 0x16
#define SX9310_REG_PROX_CTRL6_COMP_COMMON 0x20
#define SX9310_REG_PROX_CTRL7 0x17
#define SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 0x08
#define SX9310_REG_PROX_CTRL7_AVGPOSFILT_512 0x05
#define SX9310_REG_PROX_CTRL8 0x18
#define SX9310_REG_PROX_CTRL9 0x19
#define SX9310_REG_PROX_CTRL8_9_PTHRESH12_28 0x40
#define SX9310_REG_PROX_CTRL8_9_PTHRESH_96 0x88
#define SX9310_REG_PROX_CTRL8_9_BODYTHRESH_900 0x03
#define SX9310_REG_PROX_CTRL8_9_BODYTHRESH_1500 0x05
#define SX9310_REG_PROX_CTRL10 0x1a
#define SX9310_REG_PROX_CTRL10_HYST_6PCT 0x10
#define SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_8 0x12
#define SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_8 0x03
#define SX9310_REG_PROX_CTRL11 0x1b
#define SX9310_REG_PROX_CTRL12 0x1c
#define SX9310_REG_PROX_CTRL13 0x1d
#define SX9310_REG_PROX_CTRL14 0x1e
#define SX9310_REG_PROX_CTRL15 0x1f
#define SX9310_REG_PROX_CTRL16 0x20
#define SX9310_REG_PROX_CTRL17 0x21
#define SX9310_REG_PROX_CTRL18 0x22
#define SX9310_REG_PROX_CTRL19 0x23
#define SX9310_REG_SAR_CTRL0 0x2a
#define SX9310_REG_SAR_CTRL0_SARDEB_4_SAMPLES 0x40
#define SX9310_REG_SAR_CTRL0_SARHYST_8 0x10
#define SX9310_REG_SAR_CTRL1 0x2b
/* Each increment of the slope register is 0.0078125. */
#define SX9310_REG_SAR_CTRL1_SLOPE(_hnslope) (_hnslope / 78125)
#define SX9310_REG_SAR_CTRL2 0x2c
#define SX9310_REG_SAR_CTRL2_SAROFFSET_DEFAULT 0x3c
#define SX9310_REG_SENSOR_SEL 0x30
#define SX9310_REG_USE_MSB 0x31
#define SX9310_REG_USE_LSB 0x32
#define SX9310_REG_AVG_MSB 0x33
#define SX9310_REG_AVG_LSB 0x34
#define SX9310_REG_DIFF_MSB 0x35
#define SX9310_REG_DIFF_LSB 0x36
#define SX9310_REG_OFFSET_MSB 0x37
#define SX9310_REG_OFFSET_LSB 0x38
#define SX9310_REG_SAR_MSB 0x39
#define SX9310_REG_SAR_LSB 0x3a
#define SX9310_REG_I2CADDR 0x40
#define SX9310_REG_PAUSE 0x41
#define SX9310_REG_WHOAMI 0x42
#define SX9310_WHOAMI_VALUE 0x01
#define SX9311_WHOAMI_VALUE 0x02
#define SX9310_REG_RESET 0x7f
#define SX9310_SOFT_RESET 0xde
#define SX9310_SCAN_PERIOD_MASK GENMASK(7, 4)
#define SX9310_SCAN_PERIOD_SHIFT 4
#define SX9310_COMPSTAT_MASK GENMASK(3, 0)
/* 4 hardware channels, as defined in STAT0: COMB, CS2, CS1 and CS0. */
#define SX9310_NUM_CHANNELS 4
#define SX9310_CHAN_ENABLED_MASK GENMASK(3, 0)
struct sx9310_data {
/* Serialize access to registers and channel configuration */
struct mutex mutex;
struct i2c_client *client;
struct iio_trigger *trig;
struct regmap *regmap;
/*
* Last reading of the proximity status for each channel.
* We only send an event to user space when this changes.
*/
bool prox_stat[SX9310_NUM_CHANNELS];
bool trigger_enabled;
__be16 buffer[SX9310_NUM_CHANNELS +
4]; /* 64-bit data + 64-bit timestamp */
/* Remember enabled channels and sample rate during suspend. */
unsigned int suspend_ctrl0;
struct completion completion;
unsigned int chan_read, chan_event;
int channel_users[SX9310_NUM_CHANNELS];
int whoami;
};
static const struct iio_event_spec sx9310_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
},
};
#define SX9310_NAMED_CHANNEL(idx, name) \
{ \
.type = IIO_PROXIMITY, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.indexed = 1, \
.channel = idx, \
.extend_name = name, \
.address = SX9310_REG_DIFF_MSB, \
.event_spec = sx9310_events, \
.num_event_specs = ARRAY_SIZE(sx9310_events), \
.scan_index = idx, \
.scan_type = { \
.sign = 's', \
.realbits = 12, \
.storagebits = 16, \
.endianness = IIO_BE, \
}, \
}
#define SX9310_CHANNEL(idx) SX9310_NAMED_CHANNEL(idx, NULL)
static const struct iio_chan_spec sx9310_channels[] = {
SX9310_CHANNEL(0), /* CS0 */
SX9310_CHANNEL(1), /* CS1 */
SX9310_CHANNEL(2), /* CS2 */
SX9310_NAMED_CHANNEL(3, "comb"), /* COMB */
IIO_CHAN_SOFT_TIMESTAMP(4),
};
/*
* Each entry contains the integer part (val) and the fractional part, in micro
* seconds. It conforms to the IIO output IIO_VAL_INT_PLUS_MICRO.
*/
static const struct {
int val;
int val2;
} sx9310_samp_freq_table[] = {
{ 500, 0 }, /* 0000: Min (no idle time) */
{ 66, 666666 }, /* 0001: 15 ms */
{ 33, 333333 }, /* 0010: 30 ms (Typ.) */
{ 22, 222222 }, /* 0011: 45 ms */
{ 16, 666666 }, /* 0100: 60 ms */
{ 11, 111111 }, /* 0101: 90 ms */
{ 8, 333333 }, /* 0110: 120 ms */
{ 5, 0 }, /* 0111: 200 ms */
{ 2, 500000 }, /* 1000: 400 ms */
{ 1, 666666 }, /* 1001: 600 ms */
{ 1, 250000 }, /* 1010: 800 ms */
{ 1, 0 }, /* 1011: 1 s */
{ 0, 500000 }, /* 1100: 2 s */
{ 0, 333333 }, /* 1101: 3 s */
{ 0, 250000 }, /* 1110: 4 s */
{ 0, 200000 }, /* 1111: 5 s */
};
static const unsigned int sx9310_scan_period_table[] = {
2, 15, 30, 45, 60, 90, 120, 200,
400, 600, 800, 1000, 2000, 3000, 4000, 5000,
};
static ssize_t sx9310_show_samp_freq_avail(struct device *dev,
struct device_attribute *attr,
char *buf)
{
size_t len = 0;
int i;
for (i = 0; i < ARRAY_SIZE(sx9310_samp_freq_table); i++)
len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%d ",
sx9310_samp_freq_table[i].val,
sx9310_samp_freq_table[i].val2);
buf[len - 1] = '\n';
return len;
}
static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sx9310_show_samp_freq_avail);
static const struct regmap_range sx9310_writable_reg_ranges[] = {
regmap_reg_range(SX9310_REG_IRQ_MSK, SX9310_REG_IRQ_FUNC),
regmap_reg_range(SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL19),
regmap_reg_range(SX9310_REG_SAR_CTRL0, SX9310_REG_SAR_CTRL2),
regmap_reg_range(SX9310_REG_SENSOR_SEL, SX9310_REG_SENSOR_SEL),
regmap_reg_range(SX9310_REG_OFFSET_MSB, SX9310_REG_OFFSET_LSB),
regmap_reg_range(SX9310_REG_PAUSE, SX9310_REG_PAUSE),
regmap_reg_range(SX9310_REG_RESET, SX9310_REG_RESET),
};
static const struct regmap_access_table sx9310_writeable_regs = {
.yes_ranges = sx9310_writable_reg_ranges,
.n_yes_ranges = ARRAY_SIZE(sx9310_writable_reg_ranges),
};
static const struct regmap_range sx9310_readable_reg_ranges[] = {
regmap_reg_range(SX9310_REG_IRQ_SRC, SX9310_REG_IRQ_FUNC),
regmap_reg_range(SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL19),
regmap_reg_range(SX9310_REG_SAR_CTRL0, SX9310_REG_SAR_CTRL2),
regmap_reg_range(SX9310_REG_SENSOR_SEL, SX9310_REG_SAR_LSB),
regmap_reg_range(SX9310_REG_I2CADDR, SX9310_REG_WHOAMI),
regmap_reg_range(SX9310_REG_RESET, SX9310_REG_RESET),
};
static const struct regmap_access_table sx9310_readable_regs = {
.yes_ranges = sx9310_readable_reg_ranges,
.n_yes_ranges = ARRAY_SIZE(sx9310_readable_reg_ranges),
};
static const struct regmap_range sx9310_volatile_reg_ranges[] = {
regmap_reg_range(SX9310_REG_IRQ_SRC, SX9310_REG_STAT1),
regmap_reg_range(SX9310_REG_USE_MSB, SX9310_REG_DIFF_LSB),
regmap_reg_range(SX9310_REG_SAR_MSB, SX9310_REG_SAR_LSB),
regmap_reg_range(SX9310_REG_RESET, SX9310_REG_RESET),
};
static const struct regmap_access_table sx9310_volatile_regs = {
.yes_ranges = sx9310_volatile_reg_ranges,
.n_yes_ranges = ARRAY_SIZE(sx9310_volatile_reg_ranges),
};
static const struct regmap_config sx9310_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = SX9310_REG_RESET,
.cache_type = REGCACHE_RBTREE,
.wr_table = &sx9310_writeable_regs,
.rd_table = &sx9310_readable_regs,
.volatile_table = &sx9310_volatile_regs,
};
static int sx9310_update_chan_en(struct sx9310_data *data,
unsigned int chan_read,
unsigned int chan_event)
{
int ret;
if ((data->chan_read | data->chan_event) != (chan_read | chan_event)) {
ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL0,
SX9310_CHAN_ENABLED_MASK,
chan_read | chan_event);
if (ret)
return ret;
}
data->chan_read = chan_read;
data->chan_event = chan_event;
return 0;
}
static int sx9310_get_read_channel(struct sx9310_data *data, int channel)
{
return sx9310_update_chan_en(data, data->chan_read | BIT(channel),
data->chan_event);
}
static int sx9310_put_read_channel(struct sx9310_data *data, int channel)
{
return sx9310_update_chan_en(data, data->chan_read & ~BIT(channel),
data->chan_event);
}
static int sx9310_get_event_channel(struct sx9310_data *data, int channel)
{
return sx9310_update_chan_en(data, data->chan_read,
data->chan_event | BIT(channel));
}
static int sx9310_put_event_channel(struct sx9310_data *data, int channel)
{
return sx9310_update_chan_en(data, data->chan_read,
data->chan_event & ~BIT(channel));
}
static int sx9310_enable_irq(struct sx9310_data *data, unsigned int irq)
{
return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, irq);
}
static int sx9310_disable_irq(struct sx9310_data *data, unsigned int irq)
{
return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, 0);
}
static int sx9310_read_prox_data(struct sx9310_data *data,
const struct iio_chan_spec *chan, __be16 *val)
{
int ret;
ret = regmap_write(data->regmap, SX9310_REG_SENSOR_SEL, chan->channel);
if (ret < 0)
return ret;
return regmap_bulk_read(data->regmap, chan->address, val, 2);
}
/*
* If we have no interrupt support, we have to wait for a scan period
* after enabling a channel to get a result.
*/
static int sx9310_wait_for_sample(struct sx9310_data *data)
{
int ret;
unsigned int val;
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &val);
if (ret < 0)
return ret;
val = (val & SX9310_SCAN_PERIOD_MASK) >> SX9310_SCAN_PERIOD_SHIFT;
msleep(sx9310_scan_period_table[val]);
return 0;
}
static int sx9310_read_proximity(struct sx9310_data *data,
const struct iio_chan_spec *chan, int *val)
{
int ret = 0;
__be16 rawval;
mutex_lock(&data->mutex);
ret = sx9310_get_read_channel(data, chan->channel);
if (ret < 0)
goto out;
ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);
if (ret < 0)
goto out_put_channel;
mutex_unlock(&data->mutex);
if (data->client->irq > 0) {
ret = wait_for_completion_interruptible(&data->completion);
reinit_completion(&data->completion);
} else {
ret = sx9310_wait_for_sample(data);
}
mutex_lock(&data->mutex);
if (ret < 0)
goto out_disable_irq;
ret = sx9310_read_prox_data(data, chan, &rawval);
if (ret < 0)
goto out_disable_irq;
*val = sign_extend32(be16_to_cpu(rawval),
(chan->address == SX9310_REG_DIFF_MSB ? 11 : 15));
ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
if (ret < 0)
goto out_put_channel;
ret = sx9310_put_read_channel(data, chan->channel);
if (ret < 0)
goto out;
mutex_unlock(&data->mutex);
return IIO_VAL_INT;
out_disable_irq:
sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
out_put_channel:
sx9310_put_read_channel(data, chan->channel);
out:
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_read_samp_freq(struct sx9310_data *data, int *val, int *val2)
{
unsigned int regval;
int ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &regval);
if (ret < 0)
return ret;
regval = (regval & SX9310_SCAN_PERIOD_MASK) >> SX9310_SCAN_PERIOD_SHIFT;
*val = sx9310_samp_freq_table[regval].val;
*val2 = sx9310_samp_freq_table[regval].val2;
return IIO_VAL_INT_PLUS_MICRO;
}
static int sx9310_read_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int *val,
int *val2, long mask)
{
struct sx9310_data *data = iio_priv(indio_dev);
int ret;
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = sx9310_read_proximity(data, chan, val);
iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_SAMP_FREQ:
return sx9310_read_samp_freq(data, val, val2);
default:
return -EINVAL;
}
}
static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2)
{
int i, ret;
for (i = 0; i < ARRAY_SIZE(sx9310_samp_freq_table); i++)
if (val == sx9310_samp_freq_table[i].val &&
val2 == sx9310_samp_freq_table[i].val2)
break;
if (i == ARRAY_SIZE(sx9310_samp_freq_table))
return -EINVAL;
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL0,
SX9310_SCAN_PERIOD_MASK,
i << SX9310_SCAN_PERIOD_SHIFT);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_write_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int val, int val2,
long mask)
{
struct sx9310_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
if (mask != IIO_CHAN_INFO_SAMP_FREQ)
return -EINVAL;
return sx9310_set_samp_freq(data, val, val2);
}
static irqreturn_t sx9310_irq_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct sx9310_data *data = iio_priv(indio_dev);
if (data->trigger_enabled)
iio_trigger_poll(data->trig);
/*
* Even if no event is enabled, we need to wake the thread to
* clear the interrupt state by reading SX9310_REG_IRQ_SRC. It
* is not possible to do that here because regmap_read takes a
* mutex.
*/
return IRQ_WAKE_THREAD;
}
static void sx9310_push_events(struct iio_dev *indio_dev)
{
int ret;
unsigned int val, chan;
struct sx9310_data *data = iio_priv(indio_dev);
s64 timestamp = iio_get_time_ns(indio_dev);
/* Read proximity state on all channels */
ret = regmap_read(data->regmap, SX9310_REG_STAT0, &val);
if (ret < 0) {
dev_err(&data->client->dev, "i2c transfer error in irq\n");
return;
}
for (chan = 0; chan < SX9310_NUM_CHANNELS; chan++) {
int dir;
u64 ev;
bool new_prox = val & BIT(chan);
if (!(data->chan_event & BIT(chan)))
continue;
if (new_prox == data->prox_stat[chan])
/* No change on this channel. */
continue;
dir = new_prox ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan,
IIO_EV_TYPE_THRESH, dir);
iio_push_event(indio_dev, ev, timestamp);
data->prox_stat[chan] = new_prox;
}
}
static irqreturn_t sx9310_irq_thread_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct sx9310_data *data = iio_priv(indio_dev);
int ret;
unsigned int val;
mutex_lock(&data->mutex);
ret = regmap_read(data->regmap, SX9310_REG_IRQ_SRC, &val);
if (ret < 0) {
dev_err(&data->client->dev, "i2c transfer error in irq\n");
goto out;
}
if (val & SX9310_EVENT_IRQ)
sx9310_push_events(indio_dev);
if (val & SX9310_CONVDONE_IRQ)
complete(&data->completion);
out:
mutex_unlock(&data->mutex);
return IRQ_HANDLED;
}
static int sx9310_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 sx9310_data *data = iio_priv(indio_dev);
return !!(data->chan_event & BIT(chan->channel));
}
static int sx9310_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 sx9310_data *data = iio_priv(indio_dev);
int ret;
/* If the state hasn't changed, there's nothing to do. */
if (!!(data->chan_event & BIT(chan->channel)) == state)
return 0;
mutex_lock(&data->mutex);
if (state) {
ret = sx9310_get_event_channel(data, chan->channel);
if (ret < 0)
goto out_unlock;
if (!(data->chan_event & ~BIT(chan->channel))) {
ret = sx9310_enable_irq(data, SX9310_EVENT_IRQ);
if (ret < 0)
sx9310_put_event_channel(data, chan->channel);
}
} else {
ret = sx9310_put_event_channel(data, chan->channel);
if (ret < 0)
goto out_unlock;
if (!data->chan_event) {
ret = sx9310_disable_irq(data, SX9310_EVENT_IRQ);
if (ret < 0)
sx9310_get_event_channel(data, chan->channel);
}
}
out_unlock:
mutex_unlock(&data->mutex);
return ret;
}
static struct attribute *sx9310_attributes[] = {
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static const struct attribute_group sx9310_attribute_group = {
.attrs = sx9310_attributes,
};
static const struct iio_info sx9310_info = {
.attrs = &sx9310_attribute_group,
.read_raw = sx9310_read_raw,
.write_raw = sx9310_write_raw,
.read_event_config = sx9310_read_event_config,
.write_event_config = sx9310_write_event_config,
};
static int sx9310_set_trigger_state(struct iio_trigger *trig, bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct sx9310_data *data = iio_priv(indio_dev);
int ret = 0;
mutex_lock(&data->mutex);
if (state)
ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);
else if (!data->chan_read)
ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
if (ret < 0)
goto out;
data->trigger_enabled = state;
out:
mutex_unlock(&data->mutex);
return ret;
}
static const struct iio_trigger_ops sx9310_trigger_ops = {
.set_trigger_state = sx9310_set_trigger_state,
};
static irqreturn_t sx9310_trigger_handler(int irq, void *private)
{
struct iio_poll_func *pf = private;
struct iio_dev *indio_dev = pf->indio_dev;
struct sx9310_data *data = iio_priv(indio_dev);
__be16 val;
int bit, ret, i = 0;
mutex_lock(&data->mutex);
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength) {
ret = sx9310_read_prox_data(data, &indio_dev->channels[bit],
&val);
if (ret < 0)
goto out;
data->buffer[i++] = val;
}
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
pf->timestamp);
out:
mutex_unlock(&data->mutex);
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int sx9310_buffer_preenable(struct iio_dev *indio_dev)
{
struct sx9310_data *data = iio_priv(indio_dev);
unsigned int channels = 0;
int bit, ret;
mutex_lock(&data->mutex);
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength)
channels |= BIT(indio_dev->channels[bit].channel);
ret = sx9310_update_chan_en(data, channels, data->chan_event);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_buffer_postdisable(struct iio_dev *indio_dev)
{
struct sx9310_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = sx9310_update_chan_en(data, 0, data->chan_event);
mutex_unlock(&data->mutex);
return ret;
}
static const struct iio_buffer_setup_ops sx9310_buffer_setup_ops = {
.preenable = sx9310_buffer_preenable,
.postdisable = sx9310_buffer_postdisable,
};
struct sx9310_reg_default {
u8 reg;
u8 def;
};
#define SX_INIT(_reg, _def) \
{ \
.reg = SX9310_REG_##_reg, \
.def = _def, \
}
static const struct sx9310_reg_default sx9310_default_regs[] = {
SX_INIT(IRQ_MSK, 0x00),
SX_INIT(IRQ_FUNC, 0x00),
/*
* The lower 4 bits should not be set as it enable sensors measurements.
* Turning the detection on before the configuration values are set to
* good values can cause the device to return erroneous readings.
*/
SX_INIT(PROX_CTRL0, SX9310_REG_PROX_CTRL0_PROXSTAT2),
SX_INIT(PROX_CTRL1, 0x00),
SX_INIT(PROX_CTRL2, SX9310_REG_PROX_CTRL2_COMBMODE_ALL |
SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC),
SX_INIT(PROX_CTRL3, SX9310_REG_PROX_CTRL3_GAIN0_X8 |
SX9310_REG_PROX_CTRL3_GAIN12_X4),
SX_INIT(PROX_CTRL4, SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST),
SX_INIT(PROX_CTRL5, SX9310_REG_PROX_CTRL5_RANGE_SMALL |
SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 |
SX9310_REG_PROX_CTRL5_RAWFILT_1P25),
SX_INIT(PROX_CTRL6, SX9310_REG_PROX_CTRL6_COMP_COMMON),
SX_INIT(PROX_CTRL7, SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 |
SX9310_REG_PROX_CTRL7_AVGPOSFILT_512),
SX_INIT(PROX_CTRL8, SX9310_REG_PROX_CTRL8_9_PTHRESH_96 |
SX9310_REG_PROX_CTRL8_9_BODYTHRESH_1500),
SX_INIT(PROX_CTRL9, SX9310_REG_PROX_CTRL8_9_PTHRESH12_28 |
SX9310_REG_PROX_CTRL8_9_BODYTHRESH_900),
SX_INIT(PROX_CTRL10, SX9310_REG_PROX_CTRL10_HYST_6PCT |
SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_8 |
SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_8),
SX_INIT(PROX_CTRL11, 0x00),
SX_INIT(PROX_CTRL12, 0x00),
SX_INIT(PROX_CTRL13, 0x00),
SX_INIT(PROX_CTRL14, 0x00),
SX_INIT(PROX_CTRL15, 0x00),
SX_INIT(PROX_CTRL16, 0x00),
SX_INIT(PROX_CTRL17, 0x00),
SX_INIT(PROX_CTRL18, 0x00),
SX_INIT(PROX_CTRL19, 0x00),
SX_INIT(SAR_CTRL0, SX9310_REG_SAR_CTRL0_SARDEB_4_SAMPLES |
SX9310_REG_SAR_CTRL0_SARHYST_8),
SX_INIT(SAR_CTRL1, SX9310_REG_SAR_CTRL1_SLOPE(10781250)),
SX_INIT(SAR_CTRL2, SX9310_REG_SAR_CTRL2_SAROFFSET_DEFAULT),
};
/* Activate all channels and perform an initial compensation. */
static int sx9310_init_compensation(struct iio_dev *indio_dev)
{
struct sx9310_data *data = iio_priv(indio_dev);
int i, ret;
unsigned int val;
unsigned int ctrl0;
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &ctrl0);
if (ret < 0)
return ret;
/* run the compensation phase on all channels */
ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
ctrl0 | SX9310_REG_PROX_CTRL0_EN_MASK);
if (ret < 0)
return ret;
for (i = 100; i >= 0; i--) {
msleep(20);
ret = regmap_read(data->regmap, SX9310_REG_STAT1, &val);
if (ret < 0)
goto out;
if (!(val & SX9310_COMPSTAT_MASK))
break;
}
if (i < 0) {
dev_err(&data->client->dev,
"initial compensation timed out: 0x%02x", val);
ret = -ETIMEDOUT;
}
out:
regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
return ret;
}
static int sx9310_init_device(struct iio_dev *indio_dev)
{
struct sx9310_data *data = iio_priv(indio_dev);
const struct sx9310_reg_default *initval;
int ret;
unsigned int i, val;
ret = regmap_write(data->regmap, SX9310_REG_RESET, SX9310_SOFT_RESET);
if (ret < 0)
return ret;
usleep_range(1000, 2000); /* power-up time is ~1ms. */
/* Clear reset interrupt state by reading SX9310_REG_IRQ_SRC. */
ret = regmap_read(data->regmap, SX9310_REG_IRQ_SRC, &val);
if (ret < 0)
return ret;
/* Program some sane defaults. */
for (i = 0; i < ARRAY_SIZE(sx9310_default_regs); i++) {
initval = &sx9310_default_regs[i];
ret = regmap_write(data->regmap, initval->reg, initval->def);
if (ret < 0)
return ret;
}
return sx9310_init_compensation(indio_dev);
}
static int sx9310_set_indio_dev_name(struct device *dev,
struct iio_dev *indio_dev,
const struct i2c_device_id *id, int whoami)
{
const struct acpi_device_id *acpi_id;
/* id will be NULL when enumerated via ACPI */
if (id) {
if (id->driver_data != whoami)
dev_err(dev, "WHOAMI does not match i2c_device_id: %s",
id->name);
} else if (ACPI_HANDLE(dev)) {
acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!acpi_id)
return -ENODEV;
if (acpi_id->driver_data != whoami)
dev_err(dev, "WHOAMI does not match acpi_device_id: %s",
acpi_id->id);
} else
return -ENODEV;
switch (whoami) {
case SX9310_WHOAMI_VALUE:
indio_dev->name = "sx9310";
break;
case SX9311_WHOAMI_VALUE:
indio_dev->name = "sx9311";
break;
default:
dev_err(dev, "unexpected WHOAMI response: %u", whoami);
return -ENODEV;
}
return 0;
}
static int sx9310_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct iio_dev *indio_dev;
struct sx9310_data *data;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (indio_dev == NULL)
return -ENOMEM;
data = iio_priv(indio_dev);
data->client = client;
mutex_init(&data->mutex);
init_completion(&data->completion);
data->regmap = devm_regmap_init_i2c(client, &sx9310_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &data->whoami);
if (ret < 0) {
dev_err(&client->dev, "error in reading WHOAMI register: %d",
ret);
return ret;
}
ret = sx9310_set_indio_dev_name(&client->dev, indio_dev, id,
data->whoami);
if (ret < 0)
return ret;
ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(&client->dev));
indio_dev->channels = sx9310_channels;
indio_dev->num_channels = ARRAY_SIZE(sx9310_channels);
indio_dev->info = &sx9310_info;
indio_dev->modes = INDIO_DIRECT_MODE;
i2c_set_clientdata(client, indio_dev);
ret = sx9310_init_device(indio_dev);
if (ret < 0)
return ret;
if (client->irq) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
sx9310_irq_handler,
sx9310_irq_thread_handler,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"sx9310_event", indio_dev);
if (ret < 0)
return ret;
data->trig =
devm_iio_trigger_alloc(&client->dev, "%s-dev%d",
indio_dev->name, indio_dev->id);
if (!data->trig)
return -ENOMEM;
data->trig->dev.parent = &client->dev;
data->trig->ops = &sx9310_trigger_ops;
iio_trigger_set_drvdata(data->trig, indio_dev);
ret = devm_iio_trigger_register(&client->dev, data->trig);
if (ret)
return ret;
}
ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
iio_pollfunc_store_time,
sx9310_trigger_handler,
&sx9310_buffer_setup_ops);
if (ret < 0)
return ret;
return devm_iio_device_register(&client->dev, indio_dev);
}
static int __maybe_unused sx9310_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct sx9310_data *data = iio_priv(indio_dev);
u8 ctrl0;
int ret;
disable_irq_nosync(data->client->irq);
mutex_lock(&data->mutex);
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0,
&data->suspend_ctrl0);
if (ret)
goto out;
ctrl0 = data->suspend_ctrl0 & ~SX9310_REG_PROX_CTRL0_EN_MASK;
ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
if (ret)
goto out;
ret = regmap_write(data->regmap, SX9310_REG_PAUSE, 0);
out:
mutex_unlock(&data->mutex);
return ret;
}
static int __maybe_unused sx9310_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct sx9310_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = regmap_write(data->regmap, SX9310_REG_PAUSE, 1);
if (ret)
goto out;
ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
data->suspend_ctrl0);
out:
mutex_unlock(&data->mutex);
enable_irq(data->client->irq);
return ret;
}
static const struct dev_pm_ops sx9310_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(sx9310_suspend, sx9310_resume)
};
static const struct acpi_device_id sx9310_acpi_match[] = {
{ "STH9310", SX9310_WHOAMI_VALUE },
{ "STH9311", SX9311_WHOAMI_VALUE },
{},
};
MODULE_DEVICE_TABLE(acpi, sx9310_acpi_match);
static const struct of_device_id sx9310_of_match[] = {
{ .compatible = "semtech,sx9310" },
{ .compatible = "semtech,sx9311" },
{},
};
MODULE_DEVICE_TABLE(of, sx9310_of_match);
static const struct i2c_device_id sx9310_id[] = {
{ "sx9310", SX9310_WHOAMI_VALUE },
{ "sx9311", SX9311_WHOAMI_VALUE },
{},
};
MODULE_DEVICE_TABLE(i2c, sx9310_id);
static struct i2c_driver sx9310_driver = {
.driver = {
.name = "sx9310",
.acpi_match_table = ACPI_PTR(sx9310_acpi_match),
.of_match_table = of_match_ptr(sx9310_of_match),
.pm = &sx9310_pm_ops,
},
.probe = sx9310_probe,
.id_table = sx9310_id,
};
module_i2c_driver(sx9310_driver);
MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
MODULE_AUTHOR("Daniel Campello <campello@chromium.org>");
MODULE_DESCRIPTION("Driver for Semtech SX9310/SX9311 proximity sensor");
MODULE_LICENSE("GPL v2");
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