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linux/drivers/iio/proximity/sx9310.c
Stephen Boyd 5b19ca2c78 iio: sx9310: Set various settings from DT 
These properties need to be set during driver probe. Parse any DT
properties and replace the default register settings with the ones
parsed from DT.

Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Cc: Daniel Campello <campello@chromium.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: <devicetree@vger.kernel.org>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Gwendal Grignou <gwendal@chromium.org>
Cc: Evan Green <evgreen@chromium.org>
Link: https://lore.kernel.org/r/20201007011735.1346994-7-swboyd@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2020-10-10 17:38:38 +01:00

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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 in April 2019 by Evan Green <evgreen@chromium.org>
* and in January 2020 by Daniel Campello <campello@chromium.org>.
*/
#include <linux/acpi.h>
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.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_STAT1_COMPSTAT_MASK GENMASK(3, 0)
#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_REG_IRQ_FUNC 0x04
#define SX9310_REG_PROX_CTRL0 0x10
#define SX9310_REG_PROX_CTRL0_SENSOREN_MASK GENMASK(3, 0)
#define SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK GENMASK(7, 4)
#define SX9310_REG_PROX_CTRL0_SCANPERIOD_15MS 0x01
#define SX9310_REG_PROX_CTRL1 0x11
#define SX9310_REG_PROX_CTRL2 0x12
#define SX9310_REG_PROX_CTRL2_COMBMODE_MASK GENMASK(7, 6)
#define SX9310_REG_PROX_CTRL2_COMBMODE_CS0_CS1_CS2_CS3 (0x03 << 6)
#define SX9310_REG_PROX_CTRL2_COMBMODE_CS1_CS2 (0x02 << 6)
#define SX9310_REG_PROX_CTRL2_COMBMODE_CS0_CS1 (0x01 << 6)
#define SX9310_REG_PROX_CTRL2_COMBMODE_CS3 (0x00 << 6)
#define SX9310_REG_PROX_CTRL2_SHIELDEN_MASK GENMASK(3, 2)
#define SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC (0x01 << 2)
#define SX9310_REG_PROX_CTRL2_SHIELDEN_GROUND (0x02 << 2)
#define SX9310_REG_PROX_CTRL3 0x13
#define SX9310_REG_PROX_CTRL3_GAIN0_MASK GENMASK(3, 2)
#define SX9310_REG_PROX_CTRL3_GAIN0_X8 (0x03 << 2)
#define SX9310_REG_PROX_CTRL3_GAIN12_MASK GENMASK(1, 0)
#define SX9310_REG_PROX_CTRL3_GAIN12_X4 0x02
#define SX9310_REG_PROX_CTRL4 0x14
#define SX9310_REG_PROX_CTRL4_RESOLUTION_MASK GENMASK(2, 0)
#define SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST 0x07
#define SX9310_REG_PROX_CTRL4_RESOLUTION_VERY_FINE 0x06
#define SX9310_REG_PROX_CTRL4_RESOLUTION_FINE 0x05
#define SX9310_REG_PROX_CTRL4_RESOLUTION_MEDIUM 0x04
#define SX9310_REG_PROX_CTRL4_RESOLUTION_MEDIUM_COARSE 0x03
#define SX9310_REG_PROX_CTRL4_RESOLUTION_COARSE 0x02
#define SX9310_REG_PROX_CTRL4_RESOLUTION_VERY_COARSE 0x01
#define SX9310_REG_PROX_CTRL4_RESOLUTION_COARSEST 0x00
#define SX9310_REG_PROX_CTRL5 0x15
#define SX9310_REG_PROX_CTRL5_RANGE_SMALL (0x03 << 6)
#define SX9310_REG_PROX_CTRL5_STARTUPSENS_MASK GENMASK(3, 2)
#define SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 (0x01 << 2)
#define SX9310_REG_PROX_CTRL5_RAWFILT_MASK GENMASK(1, 0)
#define SX9310_REG_PROX_CTRL5_RAWFILT_SHIFT 0
#define SX9310_REG_PROX_CTRL5_RAWFILT_1P25 0x02
#define SX9310_REG_PROX_CTRL6 0x16
#define SX9310_REG_PROX_CTRL6_AVGTHRESH_DEFAULT 0x20
#define SX9310_REG_PROX_CTRL7 0x17
#define SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 (0x01 << 3)
#define SX9310_REG_PROX_CTRL7_AVGPOSFILT_MASK GENMASK(2, 0)
#define SX9310_REG_PROX_CTRL7_AVGPOSFILT_SHIFT 0
#define SX9310_REG_PROX_CTRL7_AVGPOSFILT_512 0x05
#define SX9310_REG_PROX_CTRL8 0x18
#define SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK GENMASK(7, 3)
#define SX9310_REG_PROX_CTRL9 0x19
#define SX9310_REG_PROX_CTRL8_9_PTHRESH_28 (0x08 << 3)
#define SX9310_REG_PROX_CTRL8_9_PTHRESH_96 (0x11 << 3)
#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_MASK GENMASK(5, 4)
#define SX9310_REG_PROX_CTRL10_HYST_6PCT (0x01 << 4)
#define SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK GENMASK(3, 2)
#define SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK GENMASK(1, 0)
#define SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_2 0x01
#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 (0x02 << 5)
#define SX9310_REG_SAR_CTRL0_SARHYST_8 (0x02 << 3)
#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_I2C_ADDR 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
/* 4 hardware channels, as defined in STAT0: COMB, CS2, CS1 and CS0. */
#define SX9310_NUM_CHANNELS 4
static_assert(SX9310_NUM_CHANNELS < BITS_PER_LONG);
struct sx9310_data {
/* Serialize access to registers and channel configuration */
struct mutex mutex;
struct i2c_client *client;
struct iio_trigger *trig;
struct regmap *regmap;
struct regulator_bulk_data supplies[2];
/*
* Last reading of the proximity status for each channel.
* We only send an event to user space when this changes.
*/
unsigned long chan_prox_stat;
bool trigger_enabled;
/* Ensure correct alignment of timestamp when present. */
struct {
__be16 channels[SX9310_NUM_CHANNELS];
s64 ts __aligned(8);
} buffer;
/* Remember enabled channels and sample rate during suspend. */
unsigned int suspend_ctrl0;
struct completion completion;
unsigned long chan_read;
unsigned long chan_event;
unsigned int whoami;
};
static const struct iio_event_spec sx9310_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
},
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
},
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_HYSTERESIS) |
BIT(IIO_EV_INFO_VALUE),
},
};
#define SX9310_NAMED_CHANNEL(idx, name) \
{ \
.type = IIO_PROXIMITY, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.info_mask_separate_available = \
BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
.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_I2C_ADDR, 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 long chan_read,
unsigned long chan_event)
{
int ret;
unsigned long channels = chan_read | chan_event;
if ((data->chan_read | data->chan_event) != channels) {
ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL0,
SX9310_REG_PROX_CTRL0_SENSOREN_MASK,
channels);
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)
{
if (!data->client->irq)
return 0;
return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, irq);
}
static int sx9310_disable_irq(struct sx9310_data *data, unsigned int irq)
{
if (!data->client->irq)
return 0;
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)
return ret;
return regmap_bulk_read(data->regmap, chan->address, val, sizeof(*val));
}
/*
* 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)
return ret;
val = FIELD_GET(SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK, val);
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;
__be16 rawval;
mutex_lock(&data->mutex);
ret = sx9310_get_read_channel(data, chan->channel);
if (ret)
goto out;
ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);
if (ret)
goto out_put_channel;
mutex_unlock(&data->mutex);
if (data->client->irq) {
ret = wait_for_completion_interruptible(&data->completion);
reinit_completion(&data->completion);
} else {
ret = sx9310_wait_for_sample(data);
}
mutex_lock(&data->mutex);
if (ret)
goto out_disable_irq;
ret = sx9310_read_prox_data(data, chan, &rawval);
if (ret)
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)
goto out_put_channel;
ret = sx9310_put_read_channel(data, chan->channel);
if (ret)
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_gain(struct sx9310_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int regval, gain;
int ret;
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL3, &regval);
if (ret)
return ret;
switch (chan->channel) {
case 0:
case 3:
gain = FIELD_GET(SX9310_REG_PROX_CTRL3_GAIN0_MASK, regval);
break;
case 1:
case 2:
gain = FIELD_GET(SX9310_REG_PROX_CTRL3_GAIN12_MASK, regval);
break;
default:
return -EINVAL;
}
*val = 1 << gain;
return IIO_VAL_INT;
}
static int sx9310_read_samp_freq(struct sx9310_data *data, int *val, int *val2)
{
unsigned int regval;
int ret;
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK, regval);
*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_HARDWAREGAIN:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = sx9310_read_gain(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 const int sx9310_gain_vals[] = { 1, 2, 4, 8 };
static int sx9310_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals, int *type, int *length,
long mask)
{
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_HARDWAREGAIN:
*type = IIO_VAL_INT;
*length = ARRAY_SIZE(sx9310_gain_vals);
*vals = sx9310_gain_vals;
return IIO_AVAIL_LIST;
}
return -EINVAL;
}
static const unsigned int sx9310_pthresh_codes[] = {
2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 40, 48, 56, 64, 72, 80, 88, 96, 112,
128, 144, 160, 192, 224, 256, 320, 384, 512, 640, 768, 1024, 1536
};
static int sx9310_get_thresh_reg(unsigned int channel)
{
switch (channel) {
case 0:
case 3:
return SX9310_REG_PROX_CTRL8;
case 1:
case 2:
return SX9310_REG_PROX_CTRL9;
}
return -EINVAL;
}
static int sx9310_read_thresh(struct sx9310_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int reg;
unsigned int regval;
int ret;
reg = ret = sx9310_get_thresh_reg(chan->channel);
if (ret < 0)
return ret;
ret = regmap_read(data->regmap, reg, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK, regval);
if (regval > ARRAY_SIZE(sx9310_pthresh_codes))
return -EINVAL;
*val = sx9310_pthresh_codes[regval];
return IIO_VAL_INT;
}
static int sx9310_read_hysteresis(struct sx9310_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int regval, pthresh;
int ret;
ret = sx9310_read_thresh(data, chan, &pthresh);
if (ret < 0)
return ret;
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL10, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9310_REG_PROX_CTRL10_HYST_MASK, regval);
if (!regval)
regval = 5;
/* regval is at most 5 */
*val = pthresh >> (5 - regval);
return IIO_VAL_INT;
}
static int sx9310_read_far_debounce(struct sx9310_data *data, int *val)
{
unsigned int regval;
int ret;
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL10, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, regval);
if (regval)
*val = 1 << regval;
else
*val = 0;
return IIO_VAL_INT;
}
static int sx9310_read_close_debounce(struct sx9310_data *data, int *val)
{
unsigned int regval;
int ret;
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL10, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, regval);
if (regval)
*val = 1 << regval;
else
*val = 0;
return IIO_VAL_INT;
}
static int sx9310_read_event_val(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)
{
struct sx9310_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (info) {
case IIO_EV_INFO_VALUE:
return sx9310_read_thresh(data, chan, val);
case IIO_EV_INFO_PERIOD:
switch (dir) {
case IIO_EV_DIR_RISING:
return sx9310_read_far_debounce(data, val);
case IIO_EV_DIR_FALLING:
return sx9310_read_close_debounce(data, val);
default:
return -EINVAL;
}
case IIO_EV_INFO_HYSTERESIS:
return sx9310_read_hysteresis(data, chan, val);
default:
return -EINVAL;
}
}
static int sx9310_write_thresh(struct sx9310_data *data,
const struct iio_chan_spec *chan, int val)
{
unsigned int reg;
unsigned int regval;
int ret, i;
reg = ret = sx9310_get_thresh_reg(chan->channel);
if (ret < 0)
return ret;
for (i = 0; i < ARRAY_SIZE(sx9310_pthresh_codes); i++) {
if (sx9310_pthresh_codes[i] == val) {
regval = i;
break;
}
}
if (i == ARRAY_SIZE(sx9310_pthresh_codes))
return -EINVAL;
regval = FIELD_PREP(SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK, regval);
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, reg,
SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK, regval);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_write_hysteresis(struct sx9310_data *data,
const struct iio_chan_spec *chan, int _val)
{
unsigned int hyst, val = _val;
int ret, pthresh;
ret = sx9310_read_thresh(data, chan, &pthresh);
if (ret < 0)
return ret;
if (val == 0)
hyst = 0;
else if (val == pthresh >> 2)
hyst = 3;
else if (val == pthresh >> 3)
hyst = 2;
else if (val == pthresh >> 4)
hyst = 1;
else
return -EINVAL;
hyst = FIELD_PREP(SX9310_REG_PROX_CTRL10_HYST_MASK, hyst);
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10,
SX9310_REG_PROX_CTRL10_HYST_MASK, hyst);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_write_far_debounce(struct sx9310_data *data, int val)
{
int ret;
unsigned int regval;
val = ilog2(val);
regval = FIELD_PREP(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, val);
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10,
SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK,
regval);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_write_close_debounce(struct sx9310_data *data, int val)
{
int ret;
unsigned int regval;
val = ilog2(val);
regval = FIELD_PREP(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, val);
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10,
SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK,
regval);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_write_event_val(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)
{
struct sx9310_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (info) {
case IIO_EV_INFO_VALUE:
return sx9310_write_thresh(data, chan, val);
case IIO_EV_INFO_PERIOD:
switch (dir) {
case IIO_EV_DIR_RISING:
return sx9310_write_far_debounce(data, val);
case IIO_EV_DIR_FALLING:
return sx9310_write_close_debounce(data, val);
default:
return -EINVAL;
}
case IIO_EV_INFO_HYSTERESIS:
return sx9310_write_hysteresis(data, chan, val);
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_REG_PROX_CTRL0_SCANPERIOD_MASK,
FIELD_PREP(SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK, i));
mutex_unlock(&data->mutex);
return ret;
}
static int sx9310_write_gain(struct sx9310_data *data,
const struct iio_chan_spec *chan, int val)
{
unsigned int gain, mask;
int ret;
gain = ilog2(val);
switch (chan->channel) {
case 0:
case 3:
mask = SX9310_REG_PROX_CTRL3_GAIN0_MASK;
gain = FIELD_PREP(SX9310_REG_PROX_CTRL3_GAIN0_MASK, gain);
break;
case 1:
case 2:
mask = SX9310_REG_PROX_CTRL3_GAIN12_MASK;
gain = FIELD_PREP(SX9310_REG_PROX_CTRL3_GAIN12_MASK, gain);
break;
default:
return -EINVAL;
}
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL3, mask,
gain);
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;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
return sx9310_set_samp_freq(data, val, val2);
case IIO_CHAN_INFO_HARDWAREGAIN:
return sx9310_write_gain(data, chan, val);
}
return -EINVAL;
}
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);
unsigned long prox_changed;
/* Read proximity state on all channels */
ret = regmap_read(data->regmap, SX9310_REG_STAT0, &val);
if (ret) {
dev_err(&data->client->dev, "i2c transfer error in irq\n");
return;
}
/*
* Only iterate over channels with changes on proximity status that have
* events enabled.
*/
prox_changed = (data->chan_prox_stat ^ val) & data->chan_event;
for_each_set_bit(chan, &prox_changed, SX9310_NUM_CHANNELS) {
int dir;
u64 ev;
dir = (val & BIT(chan)) ? 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->chan_prox_stat = val;
}
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) {
dev_err(&data->client->dev, "i2c transfer error in irq\n");
goto out;
}
if (val & (SX9310_FAR_IRQ | SX9310_CLOSE_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);
unsigned int eventirq = SX9310_FAR_IRQ | SX9310_CLOSE_IRQ;
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)
goto out_unlock;
if (!(data->chan_event & ~BIT(chan->channel))) {
ret = sx9310_enable_irq(data, eventirq);
if (ret)
sx9310_put_event_channel(data, chan->channel);
}
} else {
ret = sx9310_put_event_channel(data, chan->channel);
if (ret)
goto out_unlock;
if (!data->chan_event) {
ret = sx9310_disable_irq(data, eventirq);
if (ret)
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,
.read_avail = sx9310_read_avail,
.read_event_value = sx9310_read_event_val,
.write_event_value = sx9310_write_event_val,
.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)
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)
goto out;
data->buffer.channels[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 long channels = 0;
int bit, ret;
mutex_lock(&data->mutex);
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength)
__set_bit(indio_dev->channels[bit].channel, &channels);
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;
};
static const struct sx9310_reg_default sx9310_default_regs[] = {
{ SX9310_REG_IRQ_MSK, 0x00 },
{ SX9310_REG_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.
*/
{ SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL0_SCANPERIOD_15MS },
{ SX9310_REG_PROX_CTRL1, 0x00 },
{ SX9310_REG_PROX_CTRL2, SX9310_REG_PROX_CTRL2_COMBMODE_CS1_CS2 |
SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC },
{ SX9310_REG_PROX_CTRL3, SX9310_REG_PROX_CTRL3_GAIN0_X8 |
SX9310_REG_PROX_CTRL3_GAIN12_X4 },
{ SX9310_REG_PROX_CTRL4, SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST },
{ SX9310_REG_PROX_CTRL5, SX9310_REG_PROX_CTRL5_RANGE_SMALL |
SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 |
SX9310_REG_PROX_CTRL5_RAWFILT_1P25 },
{ SX9310_REG_PROX_CTRL6, SX9310_REG_PROX_CTRL6_AVGTHRESH_DEFAULT },
{ SX9310_REG_PROX_CTRL7, SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 |
SX9310_REG_PROX_CTRL7_AVGPOSFILT_512 },
{ SX9310_REG_PROX_CTRL8, SX9310_REG_PROX_CTRL8_9_PTHRESH_96 |
SX9310_REG_PROX_CTRL8_9_BODYTHRESH_1500 },
{ SX9310_REG_PROX_CTRL9, SX9310_REG_PROX_CTRL8_9_PTHRESH_28 |
SX9310_REG_PROX_CTRL8_9_BODYTHRESH_900 },
{ SX9310_REG_PROX_CTRL10, SX9310_REG_PROX_CTRL10_HYST_6PCT |
SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_2 },
{ SX9310_REG_PROX_CTRL11, 0x00 },
{ SX9310_REG_PROX_CTRL12, 0x00 },
{ SX9310_REG_PROX_CTRL13, 0x00 },
{ SX9310_REG_PROX_CTRL14, 0x00 },
{ SX9310_REG_PROX_CTRL15, 0x00 },
{ SX9310_REG_PROX_CTRL16, 0x00 },
{ SX9310_REG_PROX_CTRL17, 0x00 },
{ SX9310_REG_PROX_CTRL18, 0x00 },
{ SX9310_REG_PROX_CTRL19, 0x00 },
{ SX9310_REG_SAR_CTRL0, SX9310_REG_SAR_CTRL0_SARDEB_4_SAMPLES |
SX9310_REG_SAR_CTRL0_SARHYST_8 },
{ SX9310_REG_SAR_CTRL1, SX9310_REG_SAR_CTRL1_SLOPE(10781250) },
{ SX9310_REG_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 ret;
unsigned int val;
unsigned int ctrl0;
ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &ctrl0);
if (ret)
return ret;
/* run the compensation phase on all channels */
ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
ctrl0 | SX9310_REG_PROX_CTRL0_SENSOREN_MASK);
if (ret)
return ret;
ret = regmap_read_poll_timeout(data->regmap, SX9310_REG_STAT1, val,
!(val & SX9310_REG_STAT1_COMPSTAT_MASK),
20000, 2000000);
if (ret) {
if (ret == -ETIMEDOUT)
dev_err(&data->client->dev,
"initial compensation timed out: 0x%02x\n",
val);
return ret;
}
regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
return ret;
}
static const struct sx9310_reg_default *
sx9310_get_default_reg(struct sx9310_data *data, int i,
struct sx9310_reg_default *reg_def)
{
int ret;
const struct device_node *np = data->client->dev.of_node;
u32 combined[SX9310_NUM_CHANNELS] = { 4, 4, 4, 4 };
unsigned long comb_mask = 0;
const char *res;
u32 start = 0, raw = 0, pos = 0;
memcpy(reg_def, &sx9310_default_regs[i], sizeof(*reg_def));
if (!np)
return reg_def;
switch (reg_def->reg) {
case SX9310_REG_PROX_CTRL2:
if (of_property_read_bool(np, "semtech,cs0-ground")) {
reg_def->def &= ~SX9310_REG_PROX_CTRL2_SHIELDEN_MASK;
reg_def->def |= SX9310_REG_PROX_CTRL2_SHIELDEN_GROUND;
}
reg_def->def &= ~SX9310_REG_PROX_CTRL2_COMBMODE_MASK;
of_property_read_u32_array(np, "semtech,combined-sensors",
combined, ARRAY_SIZE(combined));
for (i = 0; i < ARRAY_SIZE(combined); i++) {
if (combined[i] <= SX9310_NUM_CHANNELS)
comb_mask |= BIT(combined[i]);
}
comb_mask &= 0xf;
if (comb_mask == (BIT(3) | BIT(2) | BIT(1) | BIT(0)))
reg_def->def |= SX9310_REG_PROX_CTRL2_COMBMODE_CS0_CS1_CS2_CS3;
else if (comb_mask == (BIT(1) | BIT(2)))
reg_def->def |= SX9310_REG_PROX_CTRL2_COMBMODE_CS1_CS2;
else if (comb_mask == (BIT(0) | BIT(1)))
reg_def->def |= SX9310_REG_PROX_CTRL2_COMBMODE_CS0_CS1;
else if (comb_mask == BIT(3))
reg_def->def |= SX9310_REG_PROX_CTRL2_COMBMODE_CS3;
break;
case SX9310_REG_PROX_CTRL4:
ret = of_property_read_string(np, "semtech,resolution", &res);
if (ret)
break;
reg_def->def &= ~SX9310_REG_PROX_CTRL4_RESOLUTION_MASK;
if (!strcmp(res, "coarsest"))
reg_def->def |= SX9310_REG_PROX_CTRL4_RESOLUTION_COARSEST;
else if (!strcmp(res, "very-coarse"))
reg_def->def |= SX9310_REG_PROX_CTRL4_RESOLUTION_VERY_COARSE;
else if (!strcmp(res, "coarse"))
reg_def->def |= SX9310_REG_PROX_CTRL4_RESOLUTION_COARSE;
else if (!strcmp(res, "medium-coarse"))
reg_def->def |= SX9310_REG_PROX_CTRL4_RESOLUTION_MEDIUM_COARSE;
else if (!strcmp(res, "medium"))
reg_def->def |= SX9310_REG_PROX_CTRL4_RESOLUTION_MEDIUM;
else if (!strcmp(res, "fine"))
reg_def->def |= SX9310_REG_PROX_CTRL4_RESOLUTION_FINE;
else if (!strcmp(res, "very-fine"))
reg_def->def |= SX9310_REG_PROX_CTRL4_RESOLUTION_VERY_FINE;
else if (!strcmp(res, "finest"))
reg_def->def |= SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST;
break;
case SX9310_REG_PROX_CTRL5:
ret = of_property_read_u32(np, "semtech,startup-sensor", &start);
if (ret) {
start = FIELD_GET(SX9310_REG_PROX_CTRL5_STARTUPSENS_MASK,
reg_def->def);
}
reg_def->def &= ~SX9310_REG_PROX_CTRL5_STARTUPSENS_MASK;
reg_def->def |= FIELD_PREP(SX9310_REG_PROX_CTRL5_STARTUPSENS_MASK,
start);
ret = of_property_read_u32(np, "semtech,proxraw-strength", &raw);
if (ret) {
raw = FIELD_GET(SX9310_REG_PROX_CTRL5_RAWFILT_MASK,
reg_def->def);
} else {
raw = ilog2(raw);
}
reg_def->def &= ~SX9310_REG_PROX_CTRL5_RAWFILT_MASK;
reg_def->def |= FIELD_PREP(SX9310_REG_PROX_CTRL5_RAWFILT_MASK,
raw);
break;
case SX9310_REG_PROX_CTRL7:
ret = of_property_read_u32(np, "semtech,avg-pos-strength", &pos);
if (ret)
break;
pos = min(max(ilog2(pos), 3), 10) - 3;
reg_def->def &= ~SX9310_REG_PROX_CTRL7_AVGPOSFILT_MASK;
reg_def->def |= FIELD_PREP(SX9310_REG_PROX_CTRL7_AVGPOSFILT_MASK,
pos);
break;
}
return reg_def;
}
static int sx9310_init_device(struct iio_dev *indio_dev)
{
struct sx9310_data *data = iio_priv(indio_dev);
struct sx9310_reg_default tmp;
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)
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)
return ret;
/* Program some sane defaults. */
for (i = 0; i < ARRAY_SIZE(sx9310_default_regs); i++) {
initval = sx9310_get_default_reg(data, i, &tmp);
ret = regmap_write(data->regmap, initval->reg, initval->def);
if (ret)
return ret;
}
return sx9310_init_compensation(indio_dev);
}
static int sx9310_set_indio_dev_name(struct device *dev,
struct iio_dev *indio_dev,
unsigned int whoami)
{
unsigned int long ddata;
ddata = (uintptr_t)device_get_match_data(dev);
if (ddata != whoami) {
dev_err(dev, "WHOAMI does not match device data: %u\n", whoami);
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\n", whoami);
return -ENODEV;
}
return 0;
}
static void sx9310_regulator_disable(void *_data)
{
struct sx9310_data *data = _data;
regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies);
}
static int sx9310_probe(struct i2c_client *client)
{
int ret;
struct device *dev = &client->dev;
struct iio_dev *indio_dev;
struct sx9310_data *data;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
data->client = client;
data->supplies[0].supply = "vdd";
data->supplies[1].supply = "svdd";
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 = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
data->supplies);
if (ret)
return ret;
ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies);
if (ret)
return ret;
/* Must wait for Tpor time after initial power up */
usleep_range(1000, 1100);
ret = devm_add_action_or_reset(dev, sx9310_regulator_disable, data);
if (ret)
return ret;
ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &data->whoami);
if (ret) {
dev_err(dev, "error in reading WHOAMI register: %d", ret);
return ret;
}
ret = sx9310_set_indio_dev_name(dev, indio_dev, data->whoami);
if (ret)
return ret;
ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(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)
return ret;
if (client->irq) {
ret = devm_request_threaded_irq(dev, client->irq,
sx9310_irq_handler,
sx9310_irq_thread_handler,
IRQF_ONESHOT,
"sx9310_event", indio_dev);
if (ret)
return ret;
data->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
indio_dev->name,
indio_dev->id);
if (!data->trig)
return -ENOMEM;
data->trig->dev.parent = dev;
data->trig->ops = &sx9310_trigger_ops;
iio_trigger_set_drvdata(data->trig, indio_dev);
ret = devm_iio_trigger_register(dev, data->trig);
if (ret)
return ret;
}
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
iio_pollfunc_store_time,
sx9310_trigger_handler,
&sx9310_buffer_setup_ops);
if (ret)
return ret;
return devm_iio_device_register(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_SENSOREN_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);
if (ret)
return ret;
enable_irq(data->client->irq);
return 0;
}
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", (void *)SX9310_WHOAMI_VALUE },
{ .compatible = "semtech,sx9311", (void *)SX9311_WHOAMI_VALUE },
{}
};
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 = sx9310_acpi_match,
.of_match_table = sx9310_of_match,
.pm = &sx9310_pm_ops,
/*
* Lots of i2c transfers in probe + over 200 ms waiting in
* sx9310_init_compensation() mean a slow probe; prefer async
* so we don't delay boot if we're builtin to the kernel.
*/
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe_new = 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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