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Subject[PATCH 2/2 v5] iio: Add SEMTECH SX9310/9311 sensor driver
Date
Add SEMTECH SX9310/9311 driver.

The device has the following entry points:

Usual frequency:
- sampling_frequency
- sampling_frequency_available

Instant reading of current values for different sensors:
- in_proximity0_raw
- in_proximity1_raw
- in_proximity2_raw
- in_proximity3_comb_raw
and associated events in events/

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Enrico Granata <egranata@chromium.org>
Signed-off-by: Daniel Campello <campello@chromium.org>
---
v5 changes:
- Fixed size of allocated buffer to include timestamp
- Changed string comparison to whoami comparison when probing and
assigning device name
v4 changes:
- Renamed in_proximity3_COMB_raw to in_proximity3_comb_raw and added
documentation for it
- Minor clean ups
v3 changes:
- Fixed "Using plain integer as NULL pointer"
v2 changes:
- Removed differential channels
- Raw channels expose data from SX9310_REG_DIFF_MSB registers
- 4th channel uses extend_name = COMB
- Allocated data->buffer statically
- Check whoami value against i2c / acpi device id
- General clean up

.../ABI/testing/sysfs-bus-iio-sx9310 | 10 +
drivers/iio/proximity/Kconfig | 13 +
drivers/iio/proximity/Makefile | 1 +
drivers/iio/proximity/sx9310.c | 1069 +++++++++++++++++
4 files changed, 1093 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-sx9310
create mode 100644 drivers/iio/proximity/sx9310.c

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-sx9310 b/Documentation/ABI/testing/sysfs-bus-iio-sx9310
new file mode 100644
index 00000000000000..3ac7759013e5c4
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-sx9310
@@ -0,0 +1,10 @@
+What: /sys/bus/iio/devices/iio:deviceX/in_proximity3_comb_raw
+Date: February 2019
+KernelVersion: 5.6
+Contact: Daniel Campello <campello@chromium.org>
+Description:
+ Proximity measurement indicating that some object is
+ near the combined sensor. The combined sensor presents
+ proximity measurements constructed by hardware by
+ combining measurements taken from a given set of
+ physical sensors.
diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
index 37606d400805a9..d57e8cc17e42d6 100644
--- a/drivers/iio/proximity/Kconfig
+++ b/drivers/iio/proximity/Kconfig
@@ -101,6 +101,19 @@ config SRF04
To compile this driver as a module, choose M here: the
module will be called srf04.

+config SX9310
+ tristate "SX9310/SX9311 Semtech proximity sensor"
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ select REGMAP_I2C
+ depends on I2C
+ help
+ Say Y here to build a driver for Semtech's SX9310/SX9311 capacitive
+ proximity/button sensor.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sx9310.
+
config SX9500
tristate "SX9500 Semtech proximity sensor"
select IIO_BUFFER
diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile
index c591b019304e7f..25e5a04da101c5 100644
--- a/drivers/iio/proximity/Makefile
+++ b/drivers/iio/proximity/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_PING) += ping.o
obj-$(CONFIG_RFD77402) += rfd77402.o
obj-$(CONFIG_SRF04) += srf04.o
obj-$(CONFIG_SRF08) += srf08.o
+obj-$(CONFIG_SX9310) += sx9310.o
obj-$(CONFIG_SX9500) += sx9500.o
obj-$(CONFIG_VL53L0X_I2C) += vl53l0x-i2c.o

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
new file mode 100644
index 00000000000000..d161f3061e353d
--- /dev/null
+++ b/drivers/iio/proximity/sx9310.c
@@ -0,0 +1,1069 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2018 Google LLC.
+ *
+ * Driver for Semtech's SX9310/SX9311 capacitive proximity/button solution.
+ * Based on SX9500 driver and Semtech driver using the input framework
+ * <https://my.syncplicity.com/share/teouwsim8niiaud/
+ * linux-driver-SX9310_NoSmartHSensing>.
+ * Reworked April 2019 by Evan Green <evgreen@chromium.org>
+ * and January 2020 by Daniel Campello <campello@chromium.org>
+ */
+
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <linux/iio/buffer.h>
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+/* Register definitions. */
+#define SX9310_REG_IRQ_SRC 0x00
+#define SX9310_REG_STAT0 0x01
+#define SX9310_REG_STAT1 0x02
+#define SX9310_REG_IRQ_MSK 0x03
+#define SX9310_CONVDONE_IRQ BIT(3)
+#define SX9310_FAR_IRQ BIT(5)
+#define SX9310_CLOSE_IRQ BIT(6)
+#define SX9310_EVENT_IRQ (SX9310_FAR_IRQ | \
+ SX9310_CLOSE_IRQ)
+#define SX9310_REG_IRQ_FUNC 0x04
+
+#define SX9310_REG_PROX_CTRL0 0x10
+#define SX9310_REG_PROX_CTRL0_PROXSTAT2 0x10
+#define SX9310_REG_PROX_CTRL0_EN_MASK 0x0F
+#define SX9310_REG_PROX_CTRL1 0x11
+#define SX9310_REG_PROX_CTRL2 0x12
+#define SX9310_REG_PROX_CTRL2_COMBMODE_ALL 0x80
+#define SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC 0x04
+#define SX9310_REG_PROX_CTRL3 0x13
+#define SX9310_REG_PROX_CTRL3_GAIN0_X8 0x0c
+#define SX9310_REG_PROX_CTRL3_GAIN12_X4 0x02
+#define SX9310_REG_PROX_CTRL4 0x14
+#define SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST 0x07
+#define SX9310_REG_PROX_CTRL5 0x15
+#define SX9310_REG_PROX_CTRL5_RANGE_SMALL 0xc0
+#define SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 0x04
+#define SX9310_REG_PROX_CTRL5_RAWFILT_1P25 0x02
+#define SX9310_REG_PROX_CTRL6 0x16
+#define SX9310_REG_PROX_CTRL6_COMP_COMMON 0x20
+#define SX9310_REG_PROX_CTRL7 0x17
+#define SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 0x08
+#define SX9310_REG_PROX_CTRL7_AVGPOSFILT_512 0x05
+#define SX9310_REG_PROX_CTRL8 0x18
+#define SX9310_REG_PROX_CTRL9 0x19
+#define SX9310_REG_PROX_CTRL8_9_PTHRESH12_28 0x40
+#define SX9310_REG_PROX_CTRL8_9_PTHRESH_96 0x88
+#define SX9310_REG_PROX_CTRL8_9_BODYTHRESH_900 0x03
+#define SX9310_REG_PROX_CTRL8_9_BODYTHRESH_1500 0x05
+#define SX9310_REG_PROX_CTRL10 0x1a
+#define SX9310_REG_PROX_CTRL10_HYST_6PCT 0x10
+#define SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_8 0x12
+#define SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_8 0x03
+#define SX9310_REG_PROX_CTRL11 0x1b
+#define SX9310_REG_PROX_CTRL12 0x1c
+#define SX9310_REG_PROX_CTRL13 0x1d
+#define SX9310_REG_PROX_CTRL14 0x1e
+#define SX9310_REG_PROX_CTRL15 0x1f
+#define SX9310_REG_PROX_CTRL16 0x20
+#define SX9310_REG_PROX_CTRL17 0x21
+#define SX9310_REG_PROX_CTRL18 0x22
+#define SX9310_REG_PROX_CTRL19 0x23
+#define SX9310_REG_SAR_CTRL0 0x2a
+#define SX9310_REG_SAR_CTRL0_SARDEB_4_SAMPLES 0x40
+#define SX9310_REG_SAR_CTRL0_SARHYST_8 0x10
+#define SX9310_REG_SAR_CTRL1 0x2b
+/* Each increment of the slope register is 0.0078125. */
+#define SX9310_REG_SAR_CTRL1_SLOPE(_hnslope) (_hnslope / 78125)
+#define SX9310_REG_SAR_CTRL2 0x2c
+#define SX9310_REG_SAR_CTRL2_SAROFFSET_DEFAULT 0x3c
+
+#define SX9310_REG_SENSOR_SEL 0x30
+
+#define SX9310_REG_USE_MSB 0x31
+#define SX9310_REG_USE_LSB 0x32
+
+#define SX9310_REG_AVG_MSB 0x33
+#define SX9310_REG_AVG_LSB 0x34
+
+#define SX9310_REG_DIFF_MSB 0x35
+#define SX9310_REG_DIFF_LSB 0x36
+
+#define SX9310_REG_OFFSET_MSB 0x37
+#define SX9310_REG_OFFSET_LSB 0x38
+
+#define SX9310_REG_SAR_MSB 0x39
+#define SX9310_REG_SAR_LSB 0x3a
+
+#define SX9310_REG_I2CADDR 0x40
+#define SX9310_REG_PAUSE 0x41
+#define SX9310_REG_WHOAMI 0x42
+#define SX9310_WHOAMI_VALUE 0x01
+#define SX9311_WHOAMI_VALUE 0x02
+
+#define SX9310_REG_RESET 0x7f
+#define SX9310_SOFT_RESET 0xde
+
+#define SX9310_SCAN_PERIOD_MASK GENMASK(7, 4)
+#define SX9310_SCAN_PERIOD_SHIFT 4
+
+#define SX9310_COMPSTAT_MASK GENMASK(3, 0)
+
+/* 4 hardware channels, as defined in STAT0: COMB, CS2, CS1 and CS0. */
+#define SX9310_NUM_CHANNELS 4
+#define SX9310_CHAN_ENABLED_MASK GENMASK(3, 0)
+
+struct sx9310_data {
+ /* Serialize access to registers and channel configuration */
+ struct mutex mutex;
+ struct i2c_client *client;
+ struct iio_trigger *trig;
+ struct regmap *regmap;
+ /*
+ * Last reading of the proximity status for each channel.
+ * We only send an event to user space when this changes.
+ */
+ bool prox_stat[SX9310_NUM_CHANNELS];
+ bool trigger_enabled;
+ __be16 buffer[SX9310_NUM_CHANNELS +
+ 4]; /* 64-bit data + 64-bit timestamp */
+ /* Remember enabled channels and sample rate during suspend. */
+ unsigned int suspend_ctrl0;
+ struct completion completion;
+ unsigned int chan_read, chan_event;
+ int channel_users[SX9310_NUM_CHANNELS];
+ int whoami;
+};
+
+static const struct iio_event_spec sx9310_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE),
+ },
+};
+
+#define SX9310_NAMED_CHANNEL(idx, name) \
+ { \
+ .type = IIO_PROXIMITY, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+ .indexed = 1, \
+ .channel = idx, \
+ .extend_name = name, \
+ .address = SX9310_REG_DIFF_MSB, \
+ .event_spec = sx9310_events, \
+ .num_event_specs = ARRAY_SIZE(sx9310_events), \
+ .scan_index = idx, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 12, \
+ .storagebits = 16, \
+ .endianness = IIO_BE, \
+ }, \
+ }
+#define SX9310_CHANNEL(idx) SX9310_NAMED_CHANNEL(idx, NULL)
+
+static const struct iio_chan_spec sx9310_channels[] = {
+ SX9310_CHANNEL(0), /* CS0 */
+ SX9310_CHANNEL(1), /* CS1 */
+ SX9310_CHANNEL(2), /* CS2 */
+ SX9310_NAMED_CHANNEL(3, "comb"), /* COMB */
+
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
+/*
+ * Each entry contains the integer part (val) and the fractional part, in micro
+ * seconds. It conforms to the IIO output IIO_VAL_INT_PLUS_MICRO.
+ */
+static const struct {
+ int val;
+ int val2;
+} sx9310_samp_freq_table[] = {
+ { 500, 0 }, /* 0000: Min (no idle time) */
+ { 66, 666666 }, /* 0001: 15 ms */
+ { 33, 333333 }, /* 0010: 30 ms (Typ.) */
+ { 22, 222222 }, /* 0011: 45 ms */
+ { 16, 666666 }, /* 0100: 60 ms */
+ { 11, 111111 }, /* 0101: 90 ms */
+ { 8, 333333 }, /* 0110: 120 ms */
+ { 5, 0 }, /* 0111: 200 ms */
+ { 2, 500000 }, /* 1000: 400 ms */
+ { 1, 666666 }, /* 1001: 600 ms */
+ { 1, 250000 }, /* 1010: 800 ms */
+ { 1, 0 }, /* 1011: 1 s */
+ { 0, 500000 }, /* 1100: 2 s */
+ { 0, 333333 }, /* 1101: 3 s */
+ { 0, 250000 }, /* 1110: 4 s */
+ { 0, 200000 }, /* 1111: 5 s */
+};
+static const unsigned int sx9310_scan_period_table[] = {
+ 2, 15, 30, 45, 60, 90, 120, 200,
+ 400, 600, 800, 1000, 2000, 3000, 4000, 5000,
+};
+
+static ssize_t sx9310_show_samp_freq_avail(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ size_t len = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(sx9310_samp_freq_table); i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%d ",
+ sx9310_samp_freq_table[i].val,
+ sx9310_samp_freq_table[i].val2);
+ buf[len - 1] = '\n';
+ return len;
+}
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sx9310_show_samp_freq_avail);
+
+static const struct regmap_range sx9310_writable_reg_ranges[] = {
+ regmap_reg_range(SX9310_REG_IRQ_MSK, SX9310_REG_IRQ_FUNC),
+ regmap_reg_range(SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL19),
+ regmap_reg_range(SX9310_REG_SAR_CTRL0, SX9310_REG_SAR_CTRL2),
+ regmap_reg_range(SX9310_REG_SENSOR_SEL, SX9310_REG_SENSOR_SEL),
+ regmap_reg_range(SX9310_REG_OFFSET_MSB, SX9310_REG_OFFSET_LSB),
+ regmap_reg_range(SX9310_REG_PAUSE, SX9310_REG_PAUSE),
+ regmap_reg_range(SX9310_REG_RESET, SX9310_REG_RESET),
+};
+
+static const struct regmap_access_table sx9310_writeable_regs = {
+ .yes_ranges = sx9310_writable_reg_ranges,
+ .n_yes_ranges = ARRAY_SIZE(sx9310_writable_reg_ranges),
+};
+
+static const struct regmap_range sx9310_readable_reg_ranges[] = {
+ regmap_reg_range(SX9310_REG_IRQ_SRC, SX9310_REG_IRQ_FUNC),
+ regmap_reg_range(SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL19),
+ regmap_reg_range(SX9310_REG_SAR_CTRL0, SX9310_REG_SAR_CTRL2),
+ regmap_reg_range(SX9310_REG_SENSOR_SEL, SX9310_REG_SAR_LSB),
+ regmap_reg_range(SX9310_REG_I2CADDR, SX9310_REG_WHOAMI),
+ regmap_reg_range(SX9310_REG_RESET, SX9310_REG_RESET),
+};
+
+static const struct regmap_access_table sx9310_readable_regs = {
+ .yes_ranges = sx9310_readable_reg_ranges,
+ .n_yes_ranges = ARRAY_SIZE(sx9310_readable_reg_ranges),
+};
+
+static const struct regmap_range sx9310_volatile_reg_ranges[] = {
+ regmap_reg_range(SX9310_REG_IRQ_SRC, SX9310_REG_STAT1),
+ regmap_reg_range(SX9310_REG_USE_MSB, SX9310_REG_DIFF_LSB),
+ regmap_reg_range(SX9310_REG_SAR_MSB, SX9310_REG_SAR_LSB),
+ regmap_reg_range(SX9310_REG_RESET, SX9310_REG_RESET),
+};
+
+static const struct regmap_access_table sx9310_volatile_regs = {
+ .yes_ranges = sx9310_volatile_reg_ranges,
+ .n_yes_ranges = ARRAY_SIZE(sx9310_volatile_reg_ranges),
+};
+
+static const struct regmap_config sx9310_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .max_register = SX9310_REG_RESET,
+ .cache_type = REGCACHE_RBTREE,
+
+ .wr_table = &sx9310_writeable_regs,
+ .rd_table = &sx9310_readable_regs,
+ .volatile_table = &sx9310_volatile_regs,
+};
+
+static int sx9310_update_chan_en(struct sx9310_data *data,
+ unsigned int chan_read,
+ unsigned int chan_event)
+{
+ int ret;
+
+ if ((data->chan_read | data->chan_event) != (chan_read | chan_event)) {
+ ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL0,
+ SX9310_CHAN_ENABLED_MASK,
+ chan_read | chan_event);
+ if (ret)
+ return ret;
+ }
+ data->chan_read = chan_read;
+ data->chan_event = chan_event;
+ return 0;
+}
+
+static int sx9310_get_read_channel(struct sx9310_data *data, int channel)
+{
+ return sx9310_update_chan_en(data, data->chan_read | BIT(channel),
+ data->chan_event);
+}
+
+static int sx9310_put_read_channel(struct sx9310_data *data, int channel)
+{
+ return sx9310_update_chan_en(data, data->chan_read & ~BIT(channel),
+ data->chan_event);
+}
+
+static int sx9310_get_event_channel(struct sx9310_data *data, int channel)
+{
+ return sx9310_update_chan_en(data, data->chan_read,
+ data->chan_event | BIT(channel));
+}
+
+static int sx9310_put_event_channel(struct sx9310_data *data, int channel)
+{
+ return sx9310_update_chan_en(data, data->chan_read,
+ data->chan_event & ~BIT(channel));
+}
+
+static int sx9310_enable_irq(struct sx9310_data *data, unsigned int irq)
+{
+ return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, irq);
+}
+
+static int sx9310_disable_irq(struct sx9310_data *data, unsigned int irq)
+{
+ return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, 0);
+}
+
+static int sx9310_read_prox_data(struct sx9310_data *data,
+ const struct iio_chan_spec *chan, __be16 *val)
+{
+ int ret;
+
+ ret = regmap_write(data->regmap, SX9310_REG_SENSOR_SEL, chan->channel);
+ if (ret < 0)
+ return ret;
+
+ return regmap_bulk_read(data->regmap, chan->address, val, 2);
+}
+
+/*
+ * If we have no interrupt support, we have to wait for a scan period
+ * after enabling a channel to get a result.
+ */
+static int sx9310_wait_for_sample(struct sx9310_data *data)
+{
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &val);
+ if (ret < 0)
+ return ret;
+
+ val = (val & SX9310_SCAN_PERIOD_MASK) >> SX9310_SCAN_PERIOD_SHIFT;
+
+ msleep(sx9310_scan_period_table[val]);
+
+ return 0;
+}
+
+static int sx9310_read_proximity(struct sx9310_data *data,
+ const struct iio_chan_spec *chan, int *val)
+{
+ int ret = 0;
+ __be16 rawval;
+
+ mutex_lock(&data->mutex);
+
+ ret = sx9310_get_read_channel(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);
+ if (ret < 0)
+ goto out_put_channel;
+
+ mutex_unlock(&data->mutex);
+
+ if (data->client->irq > 0) {
+ ret = wait_for_completion_interruptible(&data->completion);
+ reinit_completion(&data->completion);
+ } else {
+ ret = sx9310_wait_for_sample(data);
+ }
+
+ mutex_lock(&data->mutex);
+
+ if (ret < 0)
+ goto out_disable_irq;
+
+ ret = sx9310_read_prox_data(data, chan, &rawval);
+ if (ret < 0)
+ goto out_disable_irq;
+
+ *val = sign_extend32(be16_to_cpu(rawval),
+ (chan->address == SX9310_REG_DIFF_MSB ? 11 : 15));
+
+ ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
+ if (ret < 0)
+ goto out_put_channel;
+
+ ret = sx9310_put_read_channel(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ mutex_unlock(&data->mutex);
+
+ return IIO_VAL_INT;
+
+out_disable_irq:
+ sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
+out_put_channel:
+ sx9310_put_read_channel(data, chan->channel);
+out:
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int sx9310_read_samp_freq(struct sx9310_data *data, int *val, int *val2)
+{
+ unsigned int regval;
+ int ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &regval);
+
+ if (ret < 0)
+ return ret;
+
+ regval = (regval & SX9310_SCAN_PERIOD_MASK) >> SX9310_SCAN_PERIOD_SHIFT;
+ *val = sx9310_samp_freq_table[regval].val;
+ *val2 = sx9310_samp_freq_table[regval].val2;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int sx9310_read_raw(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, int *val,
+ int *val2, long mask)
+{
+ struct sx9310_data *data = iio_priv(indio_dev);
+ int ret;
+
+ if (chan->type != IIO_PROXIMITY)
+ return -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = sx9310_read_proximity(data, chan, val);
+ iio_device_release_direct_mode(indio_dev);
+ return ret;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return sx9310_read_samp_freq(data, val, val2);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int sx9310_set_samp_freq(struct sx9310_data *data, int val, int val2)
+{
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(sx9310_samp_freq_table); i++)
+ if (val == sx9310_samp_freq_table[i].val &&
+ val2 == sx9310_samp_freq_table[i].val2)
+ break;
+
+ if (i == ARRAY_SIZE(sx9310_samp_freq_table))
+ return -EINVAL;
+
+ mutex_lock(&data->mutex);
+
+ ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL0,
+ SX9310_SCAN_PERIOD_MASK,
+ i << SX9310_SCAN_PERIOD_SHIFT);
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int sx9310_write_raw(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, int val, int val2,
+ long mask)
+{
+ struct sx9310_data *data = iio_priv(indio_dev);
+
+ if (chan->type != IIO_PROXIMITY)
+ return -EINVAL;
+
+ if (mask != IIO_CHAN_INFO_SAMP_FREQ)
+ return -EINVAL;
+
+ return sx9310_set_samp_freq(data, val, val2);
+}
+
+static irqreturn_t sx9310_irq_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct sx9310_data *data = iio_priv(indio_dev);
+
+ if (data->trigger_enabled)
+ iio_trigger_poll(data->trig);
+
+ /*
+ * Even if no event is enabled, we need to wake the thread to
+ * clear the interrupt state by reading SX9310_REG_IRQ_SRC. It
+ * is not possible to do that here because regmap_read takes a
+ * mutex.
+ */
+ return IRQ_WAKE_THREAD;
+}
+
+static void sx9310_push_events(struct iio_dev *indio_dev)
+{
+ int ret;
+ unsigned int val, chan;
+ struct sx9310_data *data = iio_priv(indio_dev);
+ s64 timestamp = iio_get_time_ns(indio_dev);
+
+ /* Read proximity state on all channels */
+ ret = regmap_read(data->regmap, SX9310_REG_STAT0, &val);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "i2c transfer error in irq\n");
+ return;
+ }
+
+ for (chan = 0; chan < SX9310_NUM_CHANNELS; chan++) {
+ int dir;
+ u64 ev;
+ bool new_prox = val & BIT(chan);
+
+ if (!(data->chan_event & BIT(chan)))
+ continue;
+ if (new_prox == data->prox_stat[chan])
+ /* No change on this channel. */
+ continue;
+
+ dir = new_prox ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
+ ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan,
+ IIO_EV_TYPE_THRESH, dir);
+
+ iio_push_event(indio_dev, ev, timestamp);
+ data->prox_stat[chan] = new_prox;
+ }
+}
+
+static irqreturn_t sx9310_irq_thread_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct sx9310_data *data = iio_priv(indio_dev);
+ int ret;
+ unsigned int val;
+
+ mutex_lock(&data->mutex);
+
+ ret = regmap_read(data->regmap, SX9310_REG_IRQ_SRC, &val);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "i2c transfer error in irq\n");
+ goto out;
+ }
+
+ if (val & SX9310_EVENT_IRQ)
+ sx9310_push_events(indio_dev);
+
+ if (val & SX9310_CONVDONE_IRQ)
+ complete(&data->completion);
+
+out:
+ mutex_unlock(&data->mutex);
+
+ return IRQ_HANDLED;
+}
+
+static int sx9310_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct sx9310_data *data = iio_priv(indio_dev);
+
+ return !!(data->chan_event & BIT(chan->channel));
+}
+
+static int sx9310_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir, int state)
+{
+ struct sx9310_data *data = iio_priv(indio_dev);
+ int ret;
+
+ /* If the state hasn't changed, there's nothing to do. */
+ if (!!(data->chan_event & BIT(chan->channel)) == state)
+ return 0;
+
+ mutex_lock(&data->mutex);
+ if (state) {
+ ret = sx9310_get_event_channel(data, chan->channel);
+ if (ret < 0)
+ goto out_unlock;
+ if (!(data->chan_event & ~BIT(chan->channel))) {
+ ret = sx9310_enable_irq(data, SX9310_EVENT_IRQ);
+ if (ret < 0)
+ sx9310_put_event_channel(data, chan->channel);
+ }
+ } else {
+ ret = sx9310_put_event_channel(data, chan->channel);
+ if (ret < 0)
+ goto out_unlock;
+ if (!data->chan_event) {
+ ret = sx9310_disable_irq(data, SX9310_EVENT_IRQ);
+ if (ret < 0)
+ sx9310_get_event_channel(data, chan->channel);
+ }
+ }
+
+out_unlock:
+ mutex_unlock(&data->mutex);
+ return ret;
+}
+
+static struct attribute *sx9310_attributes[] = {
+ &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group sx9310_attribute_group = {
+ .attrs = sx9310_attributes,
+};
+
+static const struct iio_info sx9310_info = {
+ .attrs = &sx9310_attribute_group,
+ .read_raw = sx9310_read_raw,
+ .write_raw = sx9310_write_raw,
+ .read_event_config = sx9310_read_event_config,
+ .write_event_config = sx9310_write_event_config,
+};
+
+static int sx9310_set_trigger_state(struct iio_trigger *trig, bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct sx9310_data *data = iio_priv(indio_dev);
+ int ret = 0;
+
+ mutex_lock(&data->mutex);
+
+ if (state)
+ ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);
+ else if (!data->chan_read)
+ ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
+ if (ret < 0)
+ goto out;
+
+ data->trigger_enabled = state;
+
+out:
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static const struct iio_trigger_ops sx9310_trigger_ops = {
+ .set_trigger_state = sx9310_set_trigger_state,
+};
+
+static irqreturn_t sx9310_trigger_handler(int irq, void *private)
+{
+ struct iio_poll_func *pf = private;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct sx9310_data *data = iio_priv(indio_dev);
+ __be16 val;
+ int bit, ret, i = 0;
+
+ mutex_lock(&data->mutex);
+
+ for_each_set_bit(bit, indio_dev->active_scan_mask,
+ indio_dev->masklength) {
+ ret = sx9310_read_prox_data(data, &indio_dev->channels[bit],
+ &val);
+ if (ret < 0)
+ goto out;
+
+ data->buffer[i++] = val;
+ }
+
+ iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
+ pf->timestamp);
+
+out:
+ mutex_unlock(&data->mutex);
+
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int sx9310_buffer_preenable(struct iio_dev *indio_dev)
+{
+ struct sx9310_data *data = iio_priv(indio_dev);
+ unsigned int channels = 0;
+ int bit, ret;
+
+ mutex_lock(&data->mutex);
+ for_each_set_bit(bit, indio_dev->active_scan_mask,
+ indio_dev->masklength)
+ channels |= BIT(indio_dev->channels[bit].channel);
+
+ ret = sx9310_update_chan_en(data, channels, data->chan_event);
+ mutex_unlock(&data->mutex);
+ return ret;
+}
+
+static int sx9310_buffer_postdisable(struct iio_dev *indio_dev)
+{
+ struct sx9310_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = sx9310_update_chan_en(data, 0, data->chan_event);
+ mutex_unlock(&data->mutex);
+ return ret;
+}
+
+static const struct iio_buffer_setup_ops sx9310_buffer_setup_ops = {
+ .preenable = sx9310_buffer_preenable,
+ .postenable = iio_triggered_buffer_postenable,
+ .predisable = iio_triggered_buffer_predisable,
+ .postdisable = sx9310_buffer_postdisable,
+};
+
+struct sx9310_reg_default {
+ u8 reg;
+ u8 def;
+};
+
+#define SX_INIT(_reg, _def) \
+ { \
+ .reg = SX9310_REG_##_reg, \
+ .def = _def, \
+ }
+
+static const struct sx9310_reg_default sx9310_default_regs[] = {
+ SX_INIT(IRQ_MSK, 0x00),
+ SX_INIT(IRQ_FUNC, 0x00),
+ /*
+ * The lower 4 bits should not be set as it enable sensors measurements.
+ * Turning the detection on before the configuration values are set to
+ * good values can cause the device to return erroneous readings.
+ */
+ SX_INIT(PROX_CTRL0, SX9310_REG_PROX_CTRL0_PROXSTAT2),
+ SX_INIT(PROX_CTRL1, 0x00),
+ SX_INIT(PROX_CTRL2, SX9310_REG_PROX_CTRL2_COMBMODE_ALL |
+ SX9310_REG_PROX_CTRL2_SHIELDEN_DYNAMIC),
+ SX_INIT(PROX_CTRL3, SX9310_REG_PROX_CTRL3_GAIN0_X8 |
+ SX9310_REG_PROX_CTRL3_GAIN12_X4),
+ SX_INIT(PROX_CTRL4, SX9310_REG_PROX_CTRL4_RESOLUTION_FINEST),
+ SX_INIT(PROX_CTRL5, SX9310_REG_PROX_CTRL5_RANGE_SMALL |
+ SX9310_REG_PROX_CTRL5_STARTUPSENS_CS1 |
+ SX9310_REG_PROX_CTRL5_RAWFILT_1P25),
+ SX_INIT(PROX_CTRL6, SX9310_REG_PROX_CTRL6_COMP_COMMON),
+ SX_INIT(PROX_CTRL7, SX9310_REG_PROX_CTRL7_AVGNEGFILT_2 |
+ SX9310_REG_PROX_CTRL7_AVGPOSFILT_512),
+ SX_INIT(PROX_CTRL8, SX9310_REG_PROX_CTRL8_9_PTHRESH_96 |
+ SX9310_REG_PROX_CTRL8_9_BODYTHRESH_1500),
+ SX_INIT(PROX_CTRL9, SX9310_REG_PROX_CTRL8_9_PTHRESH12_28 |
+ SX9310_REG_PROX_CTRL8_9_BODYTHRESH_900),
+ SX_INIT(PROX_CTRL10, SX9310_REG_PROX_CTRL10_HYST_6PCT |
+ SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_8 |
+ SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_8),
+ SX_INIT(PROX_CTRL11, 0x00),
+ SX_INIT(PROX_CTRL12, 0x00),
+ SX_INIT(PROX_CTRL13, 0x00),
+ SX_INIT(PROX_CTRL14, 0x00),
+ SX_INIT(PROX_CTRL15, 0x00),
+ SX_INIT(PROX_CTRL16, 0x00),
+ SX_INIT(PROX_CTRL17, 0x00),
+ SX_INIT(PROX_CTRL18, 0x00),
+ SX_INIT(PROX_CTRL19, 0x00),
+ SX_INIT(SAR_CTRL0, SX9310_REG_SAR_CTRL0_SARDEB_4_SAMPLES |
+ SX9310_REG_SAR_CTRL0_SARHYST_8),
+ SX_INIT(SAR_CTRL1, SX9310_REG_SAR_CTRL1_SLOPE(10781250)),
+ SX_INIT(SAR_CTRL2, SX9310_REG_SAR_CTRL2_SAROFFSET_DEFAULT),
+};
+
+/* Activate all channels and perform an initial compensation. */
+static int sx9310_init_compensation(struct iio_dev *indio_dev)
+{
+ struct sx9310_data *data = iio_priv(indio_dev);
+ int i, ret;
+ unsigned int val;
+ unsigned int ctrl0;
+
+ ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &ctrl0);
+ if (ret < 0)
+ return ret;
+
+ /* run the compensation phase on all channels */
+ ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
+ ctrl0 | SX9310_REG_PROX_CTRL0_EN_MASK);
+ if (ret < 0)
+ return ret;
+
+ for (i = 100; i >= 0; i--) {
+ msleep(20);
+ ret = regmap_read(data->regmap, SX9310_REG_STAT1, &val);
+ if (ret < 0)
+ goto out;
+ if (!(val & SX9310_COMPSTAT_MASK))
+ break;
+ }
+
+ if (i < 0) {
+ dev_err(&data->client->dev,
+ "initial compensation timed out: 0x%02x", val);
+ ret = -ETIMEDOUT;
+ }
+
+out:
+ regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
+ return ret;
+}
+
+static int sx9310_init_device(struct iio_dev *indio_dev)
+{
+ struct sx9310_data *data = iio_priv(indio_dev);
+ const struct sx9310_reg_default *initval;
+ int ret;
+ unsigned int i, val;
+
+ ret = regmap_write(data->regmap, SX9310_REG_RESET, SX9310_SOFT_RESET);
+ if (ret < 0)
+ return ret;
+
+ usleep_range(1000, 2000); /* power-up time is ~1ms. */
+
+ /* Clear reset interrupt state by reading SX9310_REG_IRQ_SRC. */
+ ret = regmap_read(data->regmap, SX9310_REG_IRQ_SRC, &val);
+ if (ret < 0)
+ return ret;
+
+ /* Program some sane defaults. */
+ for (i = 0; i < ARRAY_SIZE(sx9310_default_regs); i++) {
+ initval = &sx9310_default_regs[i];
+ ret = regmap_write(data->regmap, initval->reg, initval->def);
+ if (ret < 0)
+ return ret;
+ }
+
+ return sx9310_init_compensation(indio_dev);
+}
+
+static int sx9310_set_indio_dev_name(struct device *dev,
+ struct iio_dev *indio_dev,
+ const struct i2c_device_id *id, int whoami)
+{
+ const struct acpi_device_id *acpi_id;
+
+ /* id will be NULL when enumerated via ACPI */
+ if (id) {
+ if (id->driver_data != whoami)
+ dev_err(dev, "WHOAMI does not match i2c_device_id: %s",
+ id->name);
+ } else if (ACPI_HANDLE(dev)) {
+ acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
+ if (!acpi_id)
+ return -ENODEV;
+ if (acpi_id->driver_data != whoami)
+ dev_err(dev, "WHOAMI does not match acpi_device_id: %s",
+ acpi_id->id);
+ } else
+ return -ENODEV;
+
+ switch (whoami) {
+ case SX9310_WHOAMI_VALUE:
+ indio_dev->name = "sx9310";
+ break;
+ case SX9311_WHOAMI_VALUE:
+ indio_dev->name = "sx9311";
+ break;
+ default:
+ dev_err(dev, "unexpected WHOAMI response: %u", whoami);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int sx9310_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct iio_dev *indio_dev;
+ struct sx9310_data *data;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (indio_dev == NULL)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ data->client = client;
+ mutex_init(&data->mutex);
+ init_completion(&data->completion);
+
+ data->regmap = devm_regmap_init_i2c(client, &sx9310_regmap_config);
+ if (IS_ERR(data->regmap))
+ return PTR_ERR(data->regmap);
+
+ ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &data->whoami);
+ if (ret < 0) {
+ dev_err(&client->dev, "error in reading WHOAMI register: %d",
+ ret);
+ return ret;
+ }
+
+ ret = sx9310_set_indio_dev_name(&client->dev, indio_dev, id,
+ data->whoami);
+ if (ret < 0)
+ return ret;
+
+ ACPI_COMPANION_SET(&indio_dev->dev, ACPI_COMPANION(&client->dev));
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->channels = sx9310_channels;
+ indio_dev->num_channels = ARRAY_SIZE(sx9310_channels);
+ indio_dev->info = &sx9310_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ i2c_set_clientdata(client, indio_dev);
+
+ ret = sx9310_init_device(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ if (client->irq) {
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ sx9310_irq_handler,
+ sx9310_irq_thread_handler,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "sx9310_event", indio_dev);
+ if (ret < 0)
+ return ret;
+
+ data->trig =
+ devm_iio_trigger_alloc(&client->dev, "%s-dev%d",
+ indio_dev->name, indio_dev->id);
+ if (!data->trig)
+ return -ENOMEM;
+
+ data->trig->dev.parent = &client->dev;
+ data->trig->ops = &sx9310_trigger_ops;
+ iio_trigger_set_drvdata(data->trig, indio_dev);
+
+ ret = devm_iio_trigger_register(&client->dev, data->trig);
+ if (ret)
+ return ret;
+ }
+
+ ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
+ iio_pollfunc_store_time,
+ sx9310_trigger_handler,
+ &sx9310_buffer_setup_ops);
+ if (ret < 0)
+ return ret;
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static int __maybe_unused sx9310_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx9310_data *data = iio_priv(indio_dev);
+ u8 ctrl0;
+ int ret;
+
+ disable_irq_nosync(data->client->irq);
+
+ mutex_lock(&data->mutex);
+ ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0,
+ &data->suspend_ctrl0);
+
+ if (ret)
+ goto out;
+
+ ctrl0 = data->suspend_ctrl0 & ~SX9310_REG_PROX_CTRL0_EN_MASK;
+ ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0);
+ if (ret)
+ goto out;
+
+ ret = regmap_write(data->regmap, SX9310_REG_PAUSE, 0);
+
+out:
+ mutex_unlock(&data->mutex);
+ return ret;
+}
+
+static int __maybe_unused sx9310_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx9310_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_write(data->regmap, SX9310_REG_PAUSE, 1);
+ if (ret)
+ goto out;
+
+ ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0,
+ data->suspend_ctrl0);
+
+out:
+ mutex_unlock(&data->mutex);
+
+ enable_irq(data->client->irq);
+
+ return ret;
+}
+
+static const struct dev_pm_ops sx9310_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(sx9310_suspend, sx9310_resume)
+};
+
+static const struct acpi_device_id sx9310_acpi_match[] = {
+ { "STH9310", SX9310_WHOAMI_VALUE },
+ { "STH9311", SX9311_WHOAMI_VALUE },
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, sx9310_acpi_match);
+
+static const struct of_device_id sx9310_of_match[] = {
+ { .compatible = "semtech,sx9310" },
+ { .compatible = "semtech,sx9311" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sx9310_of_match);
+
+static const struct i2c_device_id sx9310_id[] = {
+ { "sx9310", SX9310_WHOAMI_VALUE },
+ { "sx9311", SX9311_WHOAMI_VALUE },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, sx9310_id);
+
+static struct i2c_driver sx9310_driver = {
+ .driver = {
+ .name = "sx9310",
+ .acpi_match_table = ACPI_PTR(sx9310_acpi_match),
+ .of_match_table = of_match_ptr(sx9310_of_match),
+ .pm = &sx9310_pm_ops,
+ },
+ .probe = sx9310_probe,
+ .id_table = sx9310_id,
+};
+module_i2c_driver(sx9310_driver);
+
+MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
+MODULE_AUTHOR("Daniel Campello <campello@chromium.org>");
+MODULE_DESCRIPTION("Driver for Semtech SX9310/SX9311 proximity sensor");
+MODULE_LICENSE("GPL v2");
--
2.25.1.696.g5e7596f4ac-goog
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