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-rw-r--r--drivers/iio/proximity/sx9324.c1159
1 files changed, 1159 insertions, 0 deletions
diff --git a/drivers/iio/proximity/sx9324.c b/drivers/iio/proximity/sx9324.c
new file mode 100644
index 000000000..977cf17ce
--- /dev/null
+++ b/drivers/iio/proximity/sx9324.c
@@ -0,0 +1,1159 @@
+// 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_CTRL0_CSIDLE_SHIFT 4
+#define SX9324_REG_AFE_CTRL0_CSIDLE_MASK \
+ GENMASK(SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT + 1, \
+ SX9324_REG_AFE_CTRL0_CSIDLE_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" };
+ static const char * const sx9324_csidle[] = { "hi-z", "hi-z", "gnd",
+ "vdd" };
+#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));
+ if (ret)
+ break;
+
+ 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,cs-idle-sleep", &res);
+ if (!ret)
+ ret = match_string(sx9324_csidle, ARRAY_SIZE(sx9324_csidle), res);
+ if (ret >= 0) {
+ reg_def->def &= ~SX9324_REG_AFE_CTRL0_CSIDLE_MASK;
+ reg_def->def |= ret << SX9324_REG_AFE_CTRL0_CSIDLE_SHIFT;
+ }
+
+ 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 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 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 DEFINE_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 = pm_sleep_ptr(&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);