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linux/drivers/iio/proximity/sx9324.c
Gwendal Grignou 71783b07aa iio: sx9324: Add Setting for internal analog gain 
Based on device tree setting, set the internal analog gain.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20220429220144.1476049-9-gwendal@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2022-06-14 11:53:11 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2021 Google LLC.
*
* Driver for Semtech's SX9324 capacitive proximity/button solution.
* Based on SX9324 driver and copy of datasheet at:
* https://edit.wpgdadawant.com/uploads/news_file/program/2019/30184/tech_files/program_30184_suggest_other_file.pdf
*/
#include <linux/acpi.h>
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>
#include "sx_common.h"
/* Register definitions. */
#define SX9324_REG_IRQ_SRC SX_COMMON_REG_IRQ_SRC
#define SX9324_REG_STAT0 0x01
#define SX9324_REG_STAT1 0x02
#define SX9324_REG_STAT2 0x03
#define SX9324_REG_STAT2_COMPSTAT_MASK GENMASK(3, 0)
#define SX9324_REG_STAT3 0x04
#define SX9324_REG_IRQ_MSK 0x05
#define SX9324_CONVDONE_IRQ BIT(3)
#define SX9324_FAR_IRQ BIT(5)
#define SX9324_CLOSE_IRQ BIT(6)
#define SX9324_REG_IRQ_CFG0 0x06
#define SX9324_REG_IRQ_CFG1 0x07
#define SX9324_REG_IRQ_CFG1_FAILCOND 0x80
#define SX9324_REG_IRQ_CFG2 0x08
#define SX9324_REG_GNRL_CTRL0 0x10
#define SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK GENMASK(4, 0)
#define SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS 0x16
#define SX9324_REG_GNRL_CTRL1 0x11
#define SX9324_REG_GNRL_CTRL1_PHEN_MASK GENMASK(3, 0)
#define SX9324_REG_GNRL_CTRL1_PAUSECTRL 0x20
#define SX9324_REG_I2C_ADDR 0x14
#define SX9324_REG_CLK_SPRD 0x15
#define SX9324_REG_AFE_CTRL0 0x20
#define SX9324_REG_AFE_CTRL0_RINT_SHIFT 6
#define SX9324_REG_AFE_CTRL0_RINT_MASK \
GENMASK(SX9324_REG_AFE_CTRL0_RINT_SHIFT + 1, \
SX9324_REG_AFE_CTRL0_RINT_SHIFT)
#define SX9324_REG_AFE_CTRL0_RINT_LOWEST 0x00
#define SX9324_REG_AFE_CTRL1 0x21
#define SX9324_REG_AFE_CTRL2 0x22
#define SX9324_REG_AFE_CTRL3 0x23
#define SX9324_REG_AFE_CTRL4 0x24
#define SX9324_REG_AFE_CTRL4_FREQ_83_33HZ 0x40
#define SX9324_REG_AFE_CTRL4_RESOLUTION_MASK GENMASK(2, 0)
#define SX9324_REG_AFE_CTRL4_RES_100 0x04
#define SX9324_REG_AFE_CTRL5 0x25
#define SX9324_REG_AFE_CTRL6 0x26
#define SX9324_REG_AFE_CTRL7 0x27
#define SX9324_REG_AFE_PH0 0x28
#define SX9324_REG_AFE_PH0_PIN_MASK(_pin) \
GENMASK(2 * (_pin) + 1, 2 * (_pin))
#define SX9324_REG_AFE_PH1 0x29
#define SX9324_REG_AFE_PH2 0x2a
#define SX9324_REG_AFE_PH3 0x2b
#define SX9324_REG_AFE_CTRL8 0x2c
#define SX9324_REG_AFE_CTRL8_RESERVED 0x10
#define SX9324_REG_AFE_CTRL8_RESFILTIN_4KOHM 0x02
#define SX9324_REG_AFE_CTRL8_RESFILTIN_MASK GENMASK(3, 0)
#define SX9324_REG_AFE_CTRL9 0x2d
#define SX9324_REG_AFE_CTRL9_AGAIN_MASK GENMASK(3, 0)
#define SX9324_REG_AFE_CTRL9_AGAIN_1 0x08
#define SX9324_REG_PROX_CTRL0 0x30
#define SX9324_REG_PROX_CTRL0_GAIN_MASK GENMASK(5, 3)
#define SX9324_REG_PROX_CTRL0_GAIN_SHIFT 3
#define SX9324_REG_PROX_CTRL0_GAIN_RSVD 0x0
#define SX9324_REG_PROX_CTRL0_GAIN_1 0x1
#define SX9324_REG_PROX_CTRL0_GAIN_8 0x4
#define SX9324_REG_PROX_CTRL0_RAWFILT_MASK GENMASK(2, 0)
#define SX9324_REG_PROX_CTRL0_RAWFILT_1P50 0x01
#define SX9324_REG_PROX_CTRL1 0x31
#define SX9324_REG_PROX_CTRL2 0x32
#define SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K 0x20
#define SX9324_REG_PROX_CTRL3 0x33
#define SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES 0x40
#define SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K 0x20
#define SX9324_REG_PROX_CTRL4 0x34
#define SX9324_REG_PROX_CTRL4_AVGNEGFILT_MASK GENMASK(5, 3)
#define SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 0x08
#define SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK GENMASK(2, 0)
#define SX9324_REG_PROX_CTRL4_AVGPOS_FILT_256 0x04
#define SX9324_REG_PROX_CTRL5 0x35
#define SX9324_REG_PROX_CTRL5_HYST_MASK GENMASK(5, 4)
#define SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK GENMASK(3, 2)
#define SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK GENMASK(1, 0)
#define SX9324_REG_PROX_CTRL6 0x36
#define SX9324_REG_PROX_CTRL6_PROXTHRESH_32 0x08
#define SX9324_REG_PROX_CTRL7 0x37
#define SX9324_REG_ADV_CTRL0 0x40
#define SX9324_REG_ADV_CTRL1 0x41
#define SX9324_REG_ADV_CTRL2 0x42
#define SX9324_REG_ADV_CTRL3 0x43
#define SX9324_REG_ADV_CTRL4 0x44
#define SX9324_REG_ADV_CTRL5 0x45
#define SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK GENMASK(3, 2)
#define SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1 0x04
#define SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1 0x01
#define SX9324_REG_ADV_CTRL6 0x46
#define SX9324_REG_ADV_CTRL7 0x47
#define SX9324_REG_ADV_CTRL8 0x48
#define SX9324_REG_ADV_CTRL9 0x49
#define SX9324_REG_ADV_CTRL10 0x4a
#define SX9324_REG_ADV_CTRL11 0x4b
#define SX9324_REG_ADV_CTRL12 0x4c
#define SX9324_REG_ADV_CTRL13 0x4d
#define SX9324_REG_ADV_CTRL14 0x4e
#define SX9324_REG_ADV_CTRL15 0x4f
#define SX9324_REG_ADV_CTRL16 0x50
#define SX9324_REG_ADV_CTRL17 0x51
#define SX9324_REG_ADV_CTRL18 0x52
#define SX9324_REG_ADV_CTRL19 0x53
#define SX9324_REG_ADV_CTRL20 0x54
#define SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION 0xf0
#define SX9324_REG_PHASE_SEL 0x60
#define SX9324_REG_USEFUL_MSB 0x61
#define SX9324_REG_USEFUL_LSB 0x62
#define SX9324_REG_AVG_MSB 0x63
#define SX9324_REG_AVG_LSB 0x64
#define SX9324_REG_DIFF_MSB 0x65
#define SX9324_REG_DIFF_LSB 0x66
#define SX9324_REG_OFFSET_MSB 0x67
#define SX9324_REG_OFFSET_LSB 0x68
#define SX9324_REG_SAR_MSB 0x69
#define SX9324_REG_SAR_LSB 0x6a
#define SX9324_REG_RESET 0x9f
/* Write this to REG_RESET to do a soft reset. */
#define SX9324_SOFT_RESET 0xde
#define SX9324_REG_WHOAMI 0xfa
#define SX9324_WHOAMI_VALUE 0x23
#define SX9324_REG_REVISION 0xfe
/* 4 channels, as defined in STAT0: PH0, PH1, PH2 and PH3. */
#define SX9324_NUM_CHANNELS 4
/* 3 CS pins: CS0, CS1, CS2. */
#define SX9324_NUM_PINS 3
static const char * const sx9324_cs_pin_usage[] = { "HZ", "MI", "DS", "GD" };
static ssize_t sx9324_phase_configuration_show(struct iio_dev *indio_dev,
uintptr_t private,
const struct iio_chan_spec *chan,
char *buf)
{
struct sx_common_data *data = iio_priv(indio_dev);
unsigned int val;
int i, ret, pin_idx;
size_t len = 0;
ret = regmap_read(data->regmap, SX9324_REG_AFE_PH0 + chan->channel, &val);
if (ret < 0)
return ret;
for (i = 0; i < SX9324_NUM_PINS; i++) {
pin_idx = (val & SX9324_REG_AFE_PH0_PIN_MASK(i)) >> (2 * i);
len += sysfs_emit_at(buf, len, "%s,",
sx9324_cs_pin_usage[pin_idx]);
}
buf[len - 1] = '\n';
return len;
}
static const struct iio_chan_spec_ext_info sx9324_channel_ext_info[] = {
{
.name = "setup",
.shared = IIO_SEPARATE,
.read = sx9324_phase_configuration_show,
},
{}
};
#define SX9324_CHANNEL(idx) \
{ \
.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), \
.info_mask_shared_by_all_available = \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.indexed = 1, \
.channel = idx, \
.address = SX9324_REG_DIFF_MSB, \
.event_spec = sx_common_events, \
.num_event_specs = ARRAY_SIZE(sx_common_events), \
.scan_index = idx, \
.scan_type = { \
.sign = 's', \
.realbits = 12, \
.storagebits = 16, \
.endianness = IIO_BE, \
}, \
.ext_info = sx9324_channel_ext_info, \
}
static const struct iio_chan_spec sx9324_channels[] = {
SX9324_CHANNEL(0), /* Phase 0 */
SX9324_CHANNEL(1), /* Phase 1 */
SX9324_CHANNEL(2), /* Phase 2 */
SX9324_CHANNEL(3), /* Phase 3 */
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;
} sx9324_samp_freq_table[] = {
{ 1000, 0 }, /* 00000: Min (no idle time) */
{ 500, 0 }, /* 00001: 2 ms */
{ 250, 0 }, /* 00010: 4 ms */
{ 166, 666666 }, /* 00011: 6 ms */
{ 125, 0 }, /* 00100: 8 ms */
{ 100, 0 }, /* 00101: 10 ms */
{ 71, 428571 }, /* 00110: 14 ms */
{ 55, 555556 }, /* 00111: 18 ms */
{ 45, 454545 }, /* 01000: 22 ms */
{ 38, 461538 }, /* 01001: 26 ms */
{ 33, 333333 }, /* 01010: 30 ms */
{ 29, 411765 }, /* 01011: 34 ms */
{ 26, 315789 }, /* 01100: 38 ms */
{ 23, 809524 }, /* 01101: 42 ms */
{ 21, 739130 }, /* 01110: 46 ms */
{ 20, 0 }, /* 01111: 50 ms */
{ 17, 857143 }, /* 10000: 56 ms */
{ 16, 129032 }, /* 10001: 62 ms */
{ 14, 705882 }, /* 10010: 68 ms */
{ 13, 513514 }, /* 10011: 74 ms */
{ 12, 500000 }, /* 10100: 80 ms */
{ 11, 111111 }, /* 10101: 90 ms */
{ 10, 0 }, /* 10110: 100 ms (Typ.) */
{ 5, 0 }, /* 10111: 200 ms */
{ 3, 333333 }, /* 11000: 300 ms */
{ 2, 500000 }, /* 11001: 400 ms */
{ 1, 666667 }, /* 11010: 600 ms */
{ 1, 250000 }, /* 11011: 800 ms */
{ 1, 0 }, /* 11100: 1 s */
{ 0, 500000 }, /* 11101: 2 s */
{ 0, 333333 }, /* 11110: 3 s */
{ 0, 250000 }, /* 11111: 4 s */
};
static const unsigned int sx9324_scan_period_table[] = {
2, 15, 30, 45, 60, 90, 120, 200,
400, 600, 800, 1000, 2000, 3000, 4000, 5000,
};
static const struct regmap_range sx9324_writable_reg_ranges[] = {
/*
* To set COMPSTAT for compensation, even if datasheet says register is
* RO.
*/
regmap_reg_range(SX9324_REG_STAT2, SX9324_REG_STAT2),
regmap_reg_range(SX9324_REG_IRQ_MSK, SX9324_REG_IRQ_CFG2),
regmap_reg_range(SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL1),
/* Leave i2c and clock spreading as unavailable */
regmap_reg_range(SX9324_REG_AFE_CTRL0, SX9324_REG_AFE_CTRL9),
regmap_reg_range(SX9324_REG_PROX_CTRL0, SX9324_REG_PROX_CTRL7),
regmap_reg_range(SX9324_REG_ADV_CTRL0, SX9324_REG_ADV_CTRL20),
regmap_reg_range(SX9324_REG_PHASE_SEL, SX9324_REG_PHASE_SEL),
regmap_reg_range(SX9324_REG_OFFSET_MSB, SX9324_REG_OFFSET_LSB),
regmap_reg_range(SX9324_REG_RESET, SX9324_REG_RESET),
};
static const struct regmap_access_table sx9324_writeable_regs = {
.yes_ranges = sx9324_writable_reg_ranges,
.n_yes_ranges = ARRAY_SIZE(sx9324_writable_reg_ranges),
};
/*
* All allocated registers are readable, so we just list unallocated
* ones.
*/
static const struct regmap_range sx9324_non_readable_reg_ranges[] = {
regmap_reg_range(SX9324_REG_IRQ_CFG2 + 1, SX9324_REG_GNRL_CTRL0 - 1),
regmap_reg_range(SX9324_REG_GNRL_CTRL1 + 1, SX9324_REG_AFE_CTRL0 - 1),
regmap_reg_range(SX9324_REG_AFE_CTRL9 + 1, SX9324_REG_PROX_CTRL0 - 1),
regmap_reg_range(SX9324_REG_PROX_CTRL7 + 1, SX9324_REG_ADV_CTRL0 - 1),
regmap_reg_range(SX9324_REG_ADV_CTRL20 + 1, SX9324_REG_PHASE_SEL - 1),
regmap_reg_range(SX9324_REG_SAR_LSB + 1, SX9324_REG_RESET - 1),
regmap_reg_range(SX9324_REG_RESET + 1, SX9324_REG_WHOAMI - 1),
regmap_reg_range(SX9324_REG_WHOAMI + 1, SX9324_REG_REVISION - 1),
};
static const struct regmap_access_table sx9324_readable_regs = {
.no_ranges = sx9324_non_readable_reg_ranges,
.n_no_ranges = ARRAY_SIZE(sx9324_non_readable_reg_ranges),
};
static const struct regmap_range sx9324_volatile_reg_ranges[] = {
regmap_reg_range(SX9324_REG_IRQ_SRC, SX9324_REG_STAT3),
regmap_reg_range(SX9324_REG_USEFUL_MSB, SX9324_REG_DIFF_LSB),
regmap_reg_range(SX9324_REG_SAR_MSB, SX9324_REG_SAR_LSB),
regmap_reg_range(SX9324_REG_WHOAMI, SX9324_REG_WHOAMI),
regmap_reg_range(SX9324_REG_REVISION, SX9324_REG_REVISION),
};
static const struct regmap_access_table sx9324_volatile_regs = {
.yes_ranges = sx9324_volatile_reg_ranges,
.n_yes_ranges = ARRAY_SIZE(sx9324_volatile_reg_ranges),
};
static const struct regmap_config sx9324_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = SX9324_REG_REVISION,
.cache_type = REGCACHE_RBTREE,
.wr_table = &sx9324_writeable_regs,
.rd_table = &sx9324_readable_regs,
.volatile_table = &sx9324_volatile_regs,
};
static int sx9324_read_prox_data(struct sx_common_data *data,
const struct iio_chan_spec *chan,
__be16 *val)
{
int ret;
ret = regmap_write(data->regmap, SX9324_REG_PHASE_SEL, chan->channel);
if (ret < 0)
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 sx9324_wait_for_sample(struct sx_common_data *data)
{
int ret;
unsigned int val;
ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL0, &val);
if (ret < 0)
return ret;
val = FIELD_GET(SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, val);
msleep(sx9324_scan_period_table[val]);
return 0;
}
static int sx9324_read_gain(struct sx_common_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int reg, regval;
int ret;
reg = SX9324_REG_PROX_CTRL0 + chan->channel / 2;
ret = regmap_read(data->regmap, reg, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9324_REG_PROX_CTRL0_GAIN_MASK, regval);
if (regval)
regval--;
else if (regval == SX9324_REG_PROX_CTRL0_GAIN_RSVD ||
regval > SX9324_REG_PROX_CTRL0_GAIN_8)
return -EINVAL;
*val = 1 << regval;
return IIO_VAL_INT;
}
static int sx9324_read_samp_freq(struct sx_common_data *data,
int *val, int *val2)
{
int ret;
unsigned int regval;
ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL0, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, regval);
*val = sx9324_samp_freq_table[regval].val;
*val2 = sx9324_samp_freq_table[regval].val2;
return IIO_VAL_INT_PLUS_MICRO;
}
static int sx9324_read_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
int *val, int *val2, long mask)
{
struct sx_common_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = sx_common_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 = sx9324_read_gain(data, chan, val);
iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_SAMP_FREQ:
return sx9324_read_samp_freq(data, val, val2);
default:
return -EINVAL;
}
}
static const int sx9324_gain_vals[] = { 1, 2, 4, 8 };
static int sx9324_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(sx9324_gain_vals);
*vals = sx9324_gain_vals;
return IIO_AVAIL_LIST;
case IIO_CHAN_INFO_SAMP_FREQ:
*type = IIO_VAL_INT_PLUS_MICRO;
*length = ARRAY_SIZE(sx9324_samp_freq_table) * 2;
*vals = (int *)sx9324_samp_freq_table;
return IIO_AVAIL_LIST;
default:
return -EINVAL;
}
}
static int sx9324_set_samp_freq(struct sx_common_data *data,
int val, int val2)
{
int i, ret;
for (i = 0; i < ARRAY_SIZE(sx9324_samp_freq_table); i++)
if (val == sx9324_samp_freq_table[i].val &&
val2 == sx9324_samp_freq_table[i].val2)
break;
if (i == ARRAY_SIZE(sx9324_samp_freq_table))
return -EINVAL;
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap,
SX9324_REG_GNRL_CTRL0,
SX9324_REG_GNRL_CTRL0_SCANPERIOD_MASK, i);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9324_read_thresh(struct sx_common_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int regval;
unsigned int reg;
int ret;
/*
* TODO(gwendal): Depending on the phase function
* (proximity/table/body), retrieve the right threshold.
* For now, return the proximity threshold.
*/
reg = SX9324_REG_PROX_CTRL6 + chan->channel / 2;
ret = regmap_read(data->regmap, reg, &regval);
if (ret)
return ret;
if (regval <= 1)
*val = regval;
else
*val = (regval * regval) / 2;
return IIO_VAL_INT;
}
static int sx9324_read_hysteresis(struct sx_common_data *data,
const struct iio_chan_spec *chan, int *val)
{
unsigned int regval, pthresh;
int ret;
ret = sx9324_read_thresh(data, chan, &pthresh);
if (ret < 0)
return ret;
ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9324_REG_PROX_CTRL5_HYST_MASK, regval);
if (!regval)
*val = 0;
else
*val = pthresh >> (5 - regval);
return IIO_VAL_INT;
}
static int sx9324_read_far_debounce(struct sx_common_data *data, int *val)
{
unsigned int regval;
int ret;
ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, regval);
if (regval)
*val = 1 << regval;
else
*val = 0;
return IIO_VAL_INT;
}
static int sx9324_read_close_debounce(struct sx_common_data *data, int *val)
{
unsigned int regval;
int ret;
ret = regmap_read(data->regmap, SX9324_REG_PROX_CTRL5, &regval);
if (ret)
return ret;
regval = FIELD_GET(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, regval);
if (regval)
*val = 1 << regval;
else
*val = 0;
return IIO_VAL_INT;
}
static int sx9324_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 sx_common_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (info) {
case IIO_EV_INFO_VALUE:
return sx9324_read_thresh(data, chan, val);
case IIO_EV_INFO_PERIOD:
switch (dir) {
case IIO_EV_DIR_RISING:
return sx9324_read_far_debounce(data, val);
case IIO_EV_DIR_FALLING:
return sx9324_read_close_debounce(data, val);
default:
return -EINVAL;
}
case IIO_EV_INFO_HYSTERESIS:
return sx9324_read_hysteresis(data, chan, val);
default:
return -EINVAL;
}
}
static int sx9324_write_thresh(struct sx_common_data *data,
const struct iio_chan_spec *chan, int _val)
{
unsigned int reg, val = _val;
int ret;
reg = SX9324_REG_PROX_CTRL6 + chan->channel / 2;
if (val >= 1)
val = int_sqrt(2 * val);
if (val > 0xff)
return -EINVAL;
mutex_lock(&data->mutex);
ret = regmap_write(data->regmap, reg, val);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9324_write_hysteresis(struct sx_common_data *data,
const struct iio_chan_spec *chan, int _val)
{
unsigned int hyst, val = _val;
int ret, pthresh;
ret = sx9324_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(SX9324_REG_PROX_CTRL5_HYST_MASK, hyst);
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5,
SX9324_REG_PROX_CTRL5_HYST_MASK, hyst);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9324_write_far_debounce(struct sx_common_data *data, int _val)
{
unsigned int regval, val = _val;
int ret;
if (val > 0)
val = ilog2(val);
if (!FIELD_FIT(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, val))
return -EINVAL;
regval = FIELD_PREP(SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK, val);
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5,
SX9324_REG_PROX_CTRL5_FAR_DEBOUNCE_MASK,
regval);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9324_write_close_debounce(struct sx_common_data *data, int _val)
{
unsigned int regval, val = _val;
int ret;
if (val > 0)
val = ilog2(val);
if (!FIELD_FIT(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, val))
return -EINVAL;
regval = FIELD_PREP(SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK, val);
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, SX9324_REG_PROX_CTRL5,
SX9324_REG_PROX_CTRL5_CLOSE_DEBOUNCE_MASK,
regval);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9324_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 sx_common_data *data = iio_priv(indio_dev);
if (chan->type != IIO_PROXIMITY)
return -EINVAL;
switch (info) {
case IIO_EV_INFO_VALUE:
return sx9324_write_thresh(data, chan, val);
case IIO_EV_INFO_PERIOD:
switch (dir) {
case IIO_EV_DIR_RISING:
return sx9324_write_far_debounce(data, val);
case IIO_EV_DIR_FALLING:
return sx9324_write_close_debounce(data, val);
default:
return -EINVAL;
}
case IIO_EV_INFO_HYSTERESIS:
return sx9324_write_hysteresis(data, chan, val);
default:
return -EINVAL;
}
}
static int sx9324_write_gain(struct sx_common_data *data,
const struct iio_chan_spec *chan, int val)
{
unsigned int gain, reg;
int ret;
reg = SX9324_REG_PROX_CTRL0 + chan->channel / 2;
gain = ilog2(val) + 1;
if (val <= 0 || gain > SX9324_REG_PROX_CTRL0_GAIN_8)
return -EINVAL;
gain = FIELD_PREP(SX9324_REG_PROX_CTRL0_GAIN_MASK, gain);
mutex_lock(&data->mutex);
ret = regmap_update_bits(data->regmap, reg,
SX9324_REG_PROX_CTRL0_GAIN_MASK,
gain);
mutex_unlock(&data->mutex);
return ret;
}
static int sx9324_write_raw(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, int val, int val2,
long mask)
{
struct sx_common_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
return sx9324_set_samp_freq(data, val, val2);
case IIO_CHAN_INFO_HARDWAREGAIN:
return sx9324_write_gain(data, chan, val);
default:
return -EINVAL;
}
}
static const struct sx_common_reg_default sx9324_default_regs[] = {
{ SX9324_REG_IRQ_MSK, 0x00 },
{ SX9324_REG_IRQ_CFG0, 0x00 },
{ SX9324_REG_IRQ_CFG1, SX9324_REG_IRQ_CFG1_FAILCOND },
{ SX9324_REG_IRQ_CFG2, 0x00 },
{ SX9324_REG_GNRL_CTRL0, SX9324_REG_GNRL_CTRL0_SCANPERIOD_100MS },
/*
* 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.
*/
{ SX9324_REG_GNRL_CTRL1, SX9324_REG_GNRL_CTRL1_PAUSECTRL },
{ SX9324_REG_AFE_CTRL0, SX9324_REG_AFE_CTRL0_RINT_LOWEST },
{ SX9324_REG_AFE_CTRL3, 0x00 },
{ SX9324_REG_AFE_CTRL4, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
SX9324_REG_AFE_CTRL4_RES_100 },
{ SX9324_REG_AFE_CTRL6, 0x00 },
{ SX9324_REG_AFE_CTRL7, SX9324_REG_AFE_CTRL4_FREQ_83_33HZ |
SX9324_REG_AFE_CTRL4_RES_100 },
/* TODO(gwendal): PHx use chip default or all grounded? */
{ SX9324_REG_AFE_PH0, 0x29 },
{ SX9324_REG_AFE_PH1, 0x26 },
{ SX9324_REG_AFE_PH2, 0x1a },
{ SX9324_REG_AFE_PH3, 0x16 },
{ SX9324_REG_AFE_CTRL8, SX9324_REG_AFE_CTRL8_RESERVED |
SX9324_REG_AFE_CTRL8_RESFILTIN_4KOHM },
{ SX9324_REG_AFE_CTRL9, SX9324_REG_AFE_CTRL9_AGAIN_1 },
{ SX9324_REG_PROX_CTRL0,
SX9324_REG_PROX_CTRL0_GAIN_1 << SX9324_REG_PROX_CTRL0_GAIN_SHIFT |
SX9324_REG_PROX_CTRL0_RAWFILT_1P50 },
{ SX9324_REG_PROX_CTRL1,
SX9324_REG_PROX_CTRL0_GAIN_1 << SX9324_REG_PROX_CTRL0_GAIN_SHIFT |
SX9324_REG_PROX_CTRL0_RAWFILT_1P50 },
{ SX9324_REG_PROX_CTRL2, SX9324_REG_PROX_CTRL2_AVGNEG_THRESH_16K },
{ SX9324_REG_PROX_CTRL3, SX9324_REG_PROX_CTRL3_AVGDEB_2SAMPLES |
SX9324_REG_PROX_CTRL3_AVGPOS_THRESH_16K },
{ SX9324_REG_PROX_CTRL4, SX9324_REG_PROX_CTRL4_AVGNEG_FILT_2 |
SX9324_REG_PROX_CTRL4_AVGPOS_FILT_256 },
{ SX9324_REG_PROX_CTRL5, 0x00 },
{ SX9324_REG_PROX_CTRL6, SX9324_REG_PROX_CTRL6_PROXTHRESH_32 },
{ SX9324_REG_PROX_CTRL7, SX9324_REG_PROX_CTRL6_PROXTHRESH_32 },
{ SX9324_REG_ADV_CTRL0, 0x00 },
{ SX9324_REG_ADV_CTRL1, 0x00 },
{ SX9324_REG_ADV_CTRL2, 0x00 },
{ SX9324_REG_ADV_CTRL3, 0x00 },
{ SX9324_REG_ADV_CTRL4, 0x00 },
{ SX9324_REG_ADV_CTRL5, SX9324_REG_ADV_CTRL5_STARTUP_SENSOR_1 |
SX9324_REG_ADV_CTRL5_STARTUP_METHOD_1 },
{ SX9324_REG_ADV_CTRL6, 0x00 },
{ SX9324_REG_ADV_CTRL7, 0x00 },
{ SX9324_REG_ADV_CTRL8, 0x00 },
{ SX9324_REG_ADV_CTRL9, 0x00 },
/* Body/Table threshold */
{ SX9324_REG_ADV_CTRL10, 0x00 },
{ SX9324_REG_ADV_CTRL11, 0x00 },
{ SX9324_REG_ADV_CTRL12, 0x00 },
/* TODO(gwendal): SAR currenly disabled */
{ SX9324_REG_ADV_CTRL13, 0x00 },
{ SX9324_REG_ADV_CTRL14, 0x00 },
{ SX9324_REG_ADV_CTRL15, 0x00 },
{ SX9324_REG_ADV_CTRL16, 0x00 },
{ SX9324_REG_ADV_CTRL17, 0x00 },
{ SX9324_REG_ADV_CTRL18, 0x00 },
{ SX9324_REG_ADV_CTRL19, SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION },
{ SX9324_REG_ADV_CTRL20, SX9324_REG_ADV_CTRL19_HIGHT_FAILURE_THRESH_SATURATION },
};
/* Activate all channels and perform an initial compensation. */
static int sx9324_init_compensation(struct iio_dev *indio_dev)
{
struct sx_common_data *data = iio_priv(indio_dev);
unsigned int val;
int ret;
/* run the compensation phase on all channels */
ret = regmap_update_bits(data->regmap, SX9324_REG_STAT2,
SX9324_REG_STAT2_COMPSTAT_MASK,
SX9324_REG_STAT2_COMPSTAT_MASK);
if (ret)
return ret;
return regmap_read_poll_timeout(data->regmap, SX9324_REG_STAT2, val,
!(val & SX9324_REG_STAT2_COMPSTAT_MASK),
20000, 2000000);
}
static const struct sx_common_reg_default *
sx9324_get_default_reg(struct device *dev, int idx,
struct sx_common_reg_default *reg_def)
{
static const char * const sx9324_rints[] = { "lowest", "low", "high",
"highest" };
#define SX9324_PIN_DEF "semtech,ph0-pin"
#define SX9324_RESOLUTION_DEF "semtech,ph01-resolution"
#define SX9324_PROXRAW_DEF "semtech,ph01-proxraw-strength"
unsigned int pin_defs[SX9324_NUM_PINS];
char prop[] = SX9324_PROXRAW_DEF;
u32 start = 0, raw = 0, pos = 0;
int ret, count, ph, pin;
const char *res;
memcpy(reg_def, &sx9324_default_regs[idx], sizeof(*reg_def));
switch (reg_def->reg) {
case SX9324_REG_AFE_PH0:
case SX9324_REG_AFE_PH1:
case SX9324_REG_AFE_PH2:
case SX9324_REG_AFE_PH3:
ph = reg_def->reg - SX9324_REG_AFE_PH0;
scnprintf(prop, ARRAY_SIZE(prop), "semtech,ph%d-pin", ph);
count = device_property_count_u32(dev, prop);
if (count != ARRAY_SIZE(pin_defs))
break;
ret = device_property_read_u32_array(dev, prop, pin_defs,
ARRAY_SIZE(pin_defs));
for (pin = 0; pin < SX9324_NUM_PINS; pin++)
raw |= (pin_defs[pin] << (2 * pin)) &
SX9324_REG_AFE_PH0_PIN_MASK(pin);
reg_def->def = raw;
break;
case SX9324_REG_AFE_CTRL0:
ret = device_property_read_string(dev,
"semtech,int-comp-resistor", &res);
if (ret)
break;
ret = match_string(sx9324_rints, ARRAY_SIZE(sx9324_rints), res);
if (ret < 0)
break;
reg_def->def &= ~SX9324_REG_AFE_CTRL0_RINT_MASK;
reg_def->def |= ret << SX9324_REG_AFE_CTRL0_RINT_SHIFT;
break;
case SX9324_REG_AFE_CTRL4:
case SX9324_REG_AFE_CTRL7:
if (reg_def->reg == SX9324_REG_AFE_CTRL4)
strncpy(prop, "semtech,ph01-resolution",
ARRAY_SIZE(prop));
else
strncpy(prop, "semtech,ph23-resolution",
ARRAY_SIZE(prop));
ret = device_property_read_u32(dev, prop, &raw);
if (ret)
break;
raw = ilog2(raw) - 3;
reg_def->def &= ~SX9324_REG_AFE_CTRL4_RESOLUTION_MASK;
reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL4_RESOLUTION_MASK,
raw);
break;
case SX9324_REG_AFE_CTRL8:
ret = device_property_read_u32(dev,
"semtech,input-precharge-resistor-ohms",
&raw);
if (ret)
break;
reg_def->def &= ~SX9324_REG_AFE_CTRL8_RESFILTIN_MASK;
reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL8_RESFILTIN_MASK,
raw / 2000);
break;
case SX9324_REG_AFE_CTRL9:
ret = device_property_read_u32(dev,
"semtech,input-analog-gain", &raw);
if (ret)
break;
/*
* The analog gain has the following setting:
* +---------+----------------+----------------+
* | dt(raw) | physical value | register value |
* +---------+----------------+----------------+
* | 0 | x1.247 | 6 |
* | 1 | x1 | 8 |
* | 2 | x0.768 | 11 |
* | 3 | x0.552 | 15 |
* +---------+----------------+----------------+
*/
reg_def->def &= ~SX9324_REG_AFE_CTRL9_AGAIN_MASK;
reg_def->def |= FIELD_PREP(SX9324_REG_AFE_CTRL9_AGAIN_MASK,
6 + raw * (raw + 3) / 2);
break;
case SX9324_REG_ADV_CTRL5:
ret = device_property_read_u32(dev, "semtech,startup-sensor",
&start);
if (ret)
break;
reg_def->def &= ~SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK;
reg_def->def |= FIELD_PREP(SX9324_REG_ADV_CTRL5_STARTUPSENS_MASK,
start);
break;
case SX9324_REG_PROX_CTRL4:
ret = device_property_read_u32(dev, "semtech,avg-pos-strength",
&pos);
if (ret)
break;
/* Powers of 2, except for a gap between 16 and 64 */
raw = clamp(ilog2(pos), 3, 11) - (pos >= 32 ? 4 : 3);
reg_def->def &= ~SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK;
reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL4_AVGPOSFILT_MASK,
raw);
break;
case SX9324_REG_PROX_CTRL0:
case SX9324_REG_PROX_CTRL1:
if (reg_def->reg == SX9324_REG_PROX_CTRL0)
strncpy(prop, "semtech,ph01-proxraw-strength",
ARRAY_SIZE(prop));
else
strncpy(prop, "semtech,ph23-proxraw-strength",
ARRAY_SIZE(prop));
ret = device_property_read_u32(dev, prop, &raw);
if (ret)
break;
reg_def->def &= ~SX9324_REG_PROX_CTRL0_RAWFILT_MASK;
reg_def->def |= FIELD_PREP(SX9324_REG_PROX_CTRL0_RAWFILT_MASK,
raw);
break;
}
return reg_def;
}
static int sx9324_check_whoami(struct device *dev,
struct iio_dev *indio_dev)
{
/*
* Only one sensor for this driver. Assuming the device tree
* is correct, just set the sensor name.
*/
indio_dev->name = "sx9324";
return 0;
}
static const struct sx_common_chip_info sx9324_chip_info = {
.reg_stat = SX9324_REG_STAT0,
.reg_irq_msk = SX9324_REG_IRQ_MSK,
.reg_enable_chan = SX9324_REG_GNRL_CTRL1,
.reg_reset = SX9324_REG_RESET,
.mask_enable_chan = SX9324_REG_GNRL_CTRL1_PHEN_MASK,
.irq_msk_offset = 3,
.num_channels = SX9324_NUM_CHANNELS,
.num_default_regs = ARRAY_SIZE(sx9324_default_regs),
.ops = {
.read_prox_data = sx9324_read_prox_data,
.check_whoami = sx9324_check_whoami,
.init_compensation = sx9324_init_compensation,
.wait_for_sample = sx9324_wait_for_sample,
.get_default_reg = sx9324_get_default_reg,
},
.iio_channels = sx9324_channels,
.num_iio_channels = ARRAY_SIZE(sx9324_channels),
.iio_info = {
.read_raw = sx9324_read_raw,
.read_avail = sx9324_read_avail,
.read_event_value = sx9324_read_event_val,
.write_event_value = sx9324_write_event_val,
.write_raw = sx9324_write_raw,
.read_event_config = sx_common_read_event_config,
.write_event_config = sx_common_write_event_config,
},
};
static int sx9324_probe(struct i2c_client *client)
{
return sx_common_probe(client, &sx9324_chip_info, &sx9324_regmap_config);
}
static int __maybe_unused sx9324_suspend(struct device *dev)
{
struct sx_common_data *data = iio_priv(dev_get_drvdata(dev));
unsigned int regval;
int ret;
disable_irq_nosync(data->client->irq);
mutex_lock(&data->mutex);
ret = regmap_read(data->regmap, SX9324_REG_GNRL_CTRL1, &regval);
data->suspend_ctrl =
FIELD_GET(SX9324_REG_GNRL_CTRL1_PHEN_MASK, regval);
if (ret < 0)
goto out;
/* Disable all phases, send the device to sleep. */
ret = regmap_write(data->regmap, SX9324_REG_GNRL_CTRL1, 0);
out:
mutex_unlock(&data->mutex);
return ret;
}
static int __maybe_unused sx9324_resume(struct device *dev)
{
struct sx_common_data *data = iio_priv(dev_get_drvdata(dev));
int ret;
mutex_lock(&data->mutex);
ret = regmap_write(data->regmap, SX9324_REG_GNRL_CTRL1,
data->suspend_ctrl | SX9324_REG_GNRL_CTRL1_PAUSECTRL);
mutex_unlock(&data->mutex);
if (ret)
return ret;
enable_irq(data->client->irq);
return 0;
}
static SIMPLE_DEV_PM_OPS(sx9324_pm_ops, sx9324_suspend, sx9324_resume);
static const struct acpi_device_id sx9324_acpi_match[] = {
{ "STH9324", SX9324_WHOAMI_VALUE },
{ }
};
MODULE_DEVICE_TABLE(acpi, sx9324_acpi_match);
static const struct of_device_id sx9324_of_match[] = {
{ .compatible = "semtech,sx9324", (void *)SX9324_WHOAMI_VALUE },
{ }
};
MODULE_DEVICE_TABLE(of, sx9324_of_match);
static const struct i2c_device_id sx9324_id[] = {
{ "sx9324", SX9324_WHOAMI_VALUE },
{ }
};
MODULE_DEVICE_TABLE(i2c, sx9324_id);
static struct i2c_driver sx9324_driver = {
.driver = {
.name = "sx9324",
.acpi_match_table = sx9324_acpi_match,
.of_match_table = sx9324_of_match,
.pm = &sx9324_pm_ops,
/*
* Lots of i2c transfers in probe + over 200 ms waiting in
* sx9324_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 = sx9324_probe,
.id_table = sx9324_id,
};
module_i2c_driver(sx9324_driver);
MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
MODULE_DESCRIPTION("Driver for Semtech SX9324 proximity sensor");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(SEMTECH_PROX);
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