Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1062 insertions, 0 deletions

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
new file mode 100644
index 0000000000..d977aacb74
--- /dev/null
+++ b/drivers/iio/proximity/sx9310.c
@@ -0,0 +1,1062 @@
+// 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/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 SX9310_REG_IRQ_SRC				SX_COMMON_REG_IRQ_SRC
+#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
+
+
+/* 4 hardware channels, as defined in STAT0: COMB, CS2, CS1 and CS0. */
+#define SX9310_NUM_CHANNELS				4
+static_assert(SX9310_NUM_CHANNELS <= SX_COMMON_MAX_NUM_CHANNELS);
+
+#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),		 \
+	.info_mask_shared_by_all_available =			 \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ),			 \
+	.indexed = 1,						 \
+	.channel = idx,						 \
+	.extend_name = name,					 \
+	.address = SX9310_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,				 \
+	},							 \
+}
+#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 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_read_prox_data(struct sx_common_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 sx_common_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_gain(struct sx_common_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 sx_common_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 sx_common_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 = 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 = 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;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		*length = ARRAY_SIZE(sx9310_samp_freq_table) * 2;
+		*vals = (int *)sx9310_samp_freq_table;
+		return IIO_AVAIL_LIST;
+	default:
+		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;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int sx9310_read_thresh(struct sx_common_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 sx_common_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 sx_common_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 sx_common_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 sx_common_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 sx_common_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 sx_common_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 sx_common_data *data, int val)
+{
+	int ret;
+	unsigned int regval;
+
+	if (val > 0)
+		val = ilog2(val);
+	if (!FIELD_FIT(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, val))
+		return -EINVAL;
+
+	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 sx_common_data *data, int val)
+{
+	int ret;
+	unsigned int regval;
+
+	if (val > 0)
+		val = ilog2(val);
+	if (!FIELD_FIT(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, val))
+		return -EINVAL;
+
+	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 sx_common_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 sx_common_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 sx_common_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 sx_common_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);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct sx_common_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 sx_common_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)
+		return ret;
+
+	regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
+	return ret;
+}
+
+static const struct sx_common_reg_default *
+sx9310_get_default_reg(struct device *dev, int idx,
+		       struct sx_common_reg_default *reg_def)
+{
+	u32 combined[SX9310_NUM_CHANNELS];
+	u32 start = 0, raw = 0, pos = 0;
+	unsigned long comb_mask = 0;
+	int ret, i, count;
+	const char *res;
+
+	memcpy(reg_def, &sx9310_default_regs[idx], sizeof(*reg_def));
+	switch (reg_def->reg) {
+	case SX9310_REG_PROX_CTRL2:
+		if (device_property_read_bool(dev, "semtech,cs0-ground")) {
+			reg_def->def &= ~SX9310_REG_PROX_CTRL2_SHIELDEN_MASK;
+			reg_def->def |= SX9310_REG_PROX_CTRL2_SHIELDEN_GROUND;
+		}
+
+		count = device_property_count_u32(dev, "semtech,combined-sensors");
+		if (count < 0 || count > ARRAY_SIZE(combined))
+			break;
+		ret = device_property_read_u32_array(dev, "semtech,combined-sensors",
+				combined, count);
+		if (ret)
+			break;
+
+		for (i = 0; i < count; i++)
+			comb_mask |= BIT(combined[i]);
+
+		reg_def->def &= ~SX9310_REG_PROX_CTRL2_COMBMODE_MASK;
+		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 = device_property_read_string(dev, "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 = device_property_read_u32(dev, "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 = device_property_read_u32(dev, "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 = device_property_read_u32(dev, "semtech,avg-pos-strength", &pos);
+		if (ret)
+			break;
+
+		/* Powers of 2, except for a gap between 16 and 64 */
+		pos = clamp(ilog2(pos), 3, 11) - (pos >= 32 ? 4 : 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_check_whoami(struct device *dev,
+			       struct iio_dev *indio_dev)
+{
+	struct sx_common_data *data = iio_priv(indio_dev);
+	unsigned int long ddata;
+	unsigned int whoami;
+	int ret;
+
+	ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &whoami);
+	if (ret)
+		return ret;
+
+	ddata = (uintptr_t)device_get_match_data(dev);
+	if (ddata != whoami)
+		return -EINVAL;
+
+	switch (whoami) {
+	case SX9310_WHOAMI_VALUE:
+		indio_dev->name = "sx9310";
+		break;
+	case SX9311_WHOAMI_VALUE:
+		indio_dev->name = "sx9311";
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static const struct sx_common_chip_info sx9310_chip_info = {
+	.reg_stat = SX9310_REG_STAT0,
+	.reg_irq_msk = SX9310_REG_IRQ_MSK,
+	.reg_enable_chan = SX9310_REG_PROX_CTRL0,
+	.reg_reset = SX9310_REG_RESET,
+
+	.mask_enable_chan = SX9310_REG_STAT1_COMPSTAT_MASK,
+	.irq_msk_offset = 3,
+	.num_channels = SX9310_NUM_CHANNELS,
+	.num_default_regs = ARRAY_SIZE(sx9310_default_regs),
+
+	.ops = {
+		.read_prox_data = sx9310_read_prox_data,
+		.check_whoami = sx9310_check_whoami,
+		.init_compensation = sx9310_init_compensation,
+		.wait_for_sample = sx9310_wait_for_sample,
+		.get_default_reg = sx9310_get_default_reg,
+	},
+
+	.iio_channels = sx9310_channels,
+	.num_iio_channels = ARRAY_SIZE(sx9310_channels),
+	.iio_info =  {
+		.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 = sx_common_read_event_config,
+		.write_event_config = sx_common_write_event_config,
+	},
+};
+
+static int sx9310_probe(struct i2c_client *client)
+{
+	return sx_common_probe(client, &sx9310_chip_info, &sx9310_regmap_config);
+}
+
+static int sx9310_suspend(struct device *dev)
+{
+	struct sx_common_data *data = iio_priv(dev_get_drvdata(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_ctrl);
+	if (ret)
+		goto out;
+
+	ctrl0 = data->suspend_ctrl & ~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 sx9310_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, SX9310_REG_PAUSE, 1);
+	if (ret)
+		goto out;
+
+	ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
+			   data->suspend_ctrl);
+
+out:
+	mutex_unlock(&data->mutex);
+	if (ret)
+		return ret;
+
+	enable_irq(data->client->irq);
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(sx9310_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 = pm_sleep_ptr(&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		= 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");
+MODULE_IMPORT_NS(SEMTECH_PROX);