[PATCH v4] iio: driver for Semtech SX9500 proximity solution

* [PATCH v4] iio: driver for Semtech SX9500 proximity solution
@ 2014-12-22 12:41 Vlad Dogaru
  2014-12-26 10:31 ` Jonathan Cameron
  0 siblings, 1 reply; 4+ messages in thread
From: Vlad Dogaru @ 2014-12-22 12:41 UTC (permalink / raw)
  To: linux-iio, knaack.h, jic23; +Cc: Vlad Dogaru

Supports buffering, IIO events and changing sampling frequency.

Datasheet available at:
http://www.semtech.com/images/datasheet/sx9500_ag.pdf

Signed-off-by: Vlad Dogaru <vlad.dogaru@intel.com>
---
Changes since v3:
 - remove unnecessary typecast and double negation;

Changes since v2:
 - use GENMASK, BIT, ARRAY_SIZE macros where appropriate;
 - use bool instead of int for prox_stat;
 - rework sample frequency table code;
 - consolidate event config sanity checks to a single condition;
 - fix bug when deciding to disable proximity IRQ;
 - prefer kzalloc to kmalloc;
 - only cleanup trigger if it was registered (irq > 0);
 - add mention for building as module in Kconfig help text;

Changes since v1:
 - report raw readings of the channels instead of just 0 or 1.
 - add a new Kconfig section for proximity and leave the lightning sensor in its
   own one.

 drivers/iio/proximity/Kconfig  |  17 +
 drivers/iio/proximity/Makefile |   1 +
 drivers/iio/proximity/sx9500.c | 739 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 757 insertions(+)
 create mode 100644 drivers/iio/proximity/sx9500.c

diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
index 0c8cdf5..41a8d8f 100644
--- a/drivers/iio/proximity/Kconfig
+++ b/drivers/iio/proximity/Kconfig
@@ -17,3 +17,20 @@ config AS3935
 	  module will be called as3935
 
 endmenu
+
+menu "Proximity sensors"
+
+config SX9500
+	tristate "SX9500 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 SX9500 capacitive
+	  proximity/button sensor.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called sx9500.
+
+endmenu
diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile
index 743adee..9818dc5 100644
--- a/drivers/iio/proximity/Makefile
+++ b/drivers/iio/proximity/Makefile
@@ -4,3 +4,4 @@
 
 # When adding new entries keep the list in alphabetical order
 obj-$(CONFIG_AS3935)		+= as3935.o
+obj-$(CONFIG_SX9500)		+= sx9500.o
diff --git a/drivers/iio/proximity/sx9500.c b/drivers/iio/proximity/sx9500.c
new file mode 100644
index 0000000..24ab48c
--- /dev/null
+++ b/drivers/iio/proximity/sx9500.c
@@ -0,0 +1,739 @@
+/*
+ * Copyright (c) 2014 Intel Corporation
+ *
+ * Driver for Semtech's SX9500 capacitive proximity/button solution.
+ * Datasheet available at
+ * <http://www.semtech.com/images/datasheet/sx9500.pdf>.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+#define SX9500_DRIVER_NAME		"sx9500"
+#define SX9500_IRQ_NAME			"sx9500_event"
+#define SX9500_GPIO_NAME		"sx9500_gpio"
+
+/* Register definitions. */
+#define SX9500_REG_IRQ_SRC		0x00
+#define SX9500_REG_STAT			0x01
+#define SX9500_REG_IRQ_MSK		0x03
+
+#define SX9500_REG_PROX_CTRL0		0x06
+#define SX9500_REG_PROX_CTRL1		0x07
+#define SX9500_REG_PROX_CTRL2		0x08
+#define SX9500_REG_PROX_CTRL3		0x09
+#define SX9500_REG_PROX_CTRL4		0x0a
+#define SX9500_REG_PROX_CTRL5		0x0b
+#define SX9500_REG_PROX_CTRL6		0x0c
+#define SX9500_REG_PROX_CTRL7		0x0d
+#define SX9500_REG_PROX_CTRL8		0x0e
+
+#define SX9500_REG_SENSOR_SEL		0x20
+#define SX9500_REG_USE_MSB		0x21
+#define SX9500_REG_USE_LSB		0x22
+#define SX9500_REG_AVG_MSB		0x23
+#define SX9500_REG_AVG_LSB		0x24
+#define SX9500_REG_DIFF_MSB		0x25
+#define SX9500_REG_DIFF_LSB		0x26
+#define SX9500_REG_OFFSET_MSB		0x27
+#define SX9500_REG_OFFSET_LSB		0x28
+
+#define SX9500_REG_RESET		0x7f
+
+/* Write this to REG_RESET to do a soft reset. */
+#define SX9500_SOFT_RESET		0xde
+
+#define SX9500_SCAN_PERIOD_MASK		GENMASK(6, 4)
+#define SX9500_SCAN_PERIOD_SHIFT	4
+
+/*
+ * These serve for identifying IRQ source in the IRQ_SRC register, and
+ * also for masking the IRQs in the IRQ_MSK register.
+ */
+#define SX9500_CLOSE_IRQ		BIT(6)
+#define SX9500_FAR_IRQ			BIT(5)
+#define SX9500_CONVDONE_IRQ		BIT(3)
+
+#define SX9500_PROXSTAT_SHIFT		4
+
+#define SX9500_NUM_CHANNELS		4
+
+struct sx9500_data {
+	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[SX9500_NUM_CHANNELS];
+	bool event_enabled[SX9500_NUM_CHANNELS];
+	bool trigger_enabled;
+};
+
+static const struct iio_event_spec sx9500_events[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_EITHER,
+		.mask_separate = BIT(IIO_EV_INFO_ENABLE),
+	},
+};
+
+#define SX9500_CHANNEL(idx)					\
+	{							\
+		.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,					\
+		.event_spec = sx9500_events,			\
+		.num_event_specs = ARRAY_SIZE(sx9500_events),	\
+		.scan_index = idx,				\
+		.scan_type = {					\
+			.sign = 'u',				\
+			.realbits = 16,				\
+			.storagebits = 16,			\
+			.shift = 0,				\
+		},						\
+	}
+
+static const struct iio_chan_spec sx9500_channels[] = {
+	SX9500_CHANNEL(0),
+	SX9500_CHANNEL(1),
+	SX9500_CHANNEL(2),
+	SX9500_CHANNEL(3),
+	IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
+static const struct {
+	int val;
+	int val2;
+} sx9500_samp_freq_table[] = {
+	{33, 333333},
+	{16, 666666},
+	{11, 111111},
+	{8, 333333},
+	{6, 666666},
+	{5, 0},
+	{3, 333333},
+	{2, 500000},
+};
+
+static const struct regmap_range sx9500_writable_reg_ranges[] = {
+	regmap_reg_range(SX9500_REG_IRQ_MSK, SX9500_REG_IRQ_MSK),
+	regmap_reg_range(SX9500_REG_PROX_CTRL0, SX9500_REG_PROX_CTRL8),
+	regmap_reg_range(SX9500_REG_SENSOR_SEL, SX9500_REG_SENSOR_SEL),
+	regmap_reg_range(SX9500_REG_OFFSET_MSB, SX9500_REG_OFFSET_LSB),
+	regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET),
+};
+
+static const struct regmap_access_table sx9500_writeable_regs = {
+	.yes_ranges = sx9500_writable_reg_ranges,
+	.n_yes_ranges = ARRAY_SIZE(sx9500_writable_reg_ranges),
+};
+
+/*
+ * All allocated registers are readable, so we just list unallocated
+ * ones.
+ */
+static const struct regmap_range sx9500_non_readable_reg_ranges[] = {
+	regmap_reg_range(SX9500_REG_STAT + 1, SX9500_REG_STAT + 1),
+	regmap_reg_range(SX9500_REG_IRQ_MSK + 1, SX9500_REG_PROX_CTRL0 - 1),
+	regmap_reg_range(SX9500_REG_PROX_CTRL8 + 1, SX9500_REG_SENSOR_SEL - 1),
+	regmap_reg_range(SX9500_REG_OFFSET_LSB + 1, SX9500_REG_RESET - 1),
+};
+
+static const struct regmap_access_table sx9500_readable_regs = {
+	.no_ranges = sx9500_non_readable_reg_ranges,
+	.n_no_ranges = ARRAY_SIZE(sx9500_non_readable_reg_ranges),
+};
+
+static const struct regmap_range sx9500_volatile_reg_ranges[] = {
+	regmap_reg_range(SX9500_REG_IRQ_SRC, SX9500_REG_STAT),
+	regmap_reg_range(SX9500_REG_USE_MSB, SX9500_REG_OFFSET_LSB),
+	regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET),
+};
+
+static const struct regmap_access_table sx9500_volatile_regs = {
+	.yes_ranges = sx9500_volatile_reg_ranges,
+	.n_yes_ranges = ARRAY_SIZE(sx9500_volatile_reg_ranges),
+};
+
+static const struct regmap_config sx9500_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = SX9500_REG_RESET,
+	.cache_type = REGCACHE_RBTREE,
+
+	.wr_table = &sx9500_writeable_regs,
+	.rd_table = &sx9500_readable_regs,
+	.volatile_table = &sx9500_volatile_regs,
+};
+
+static int sx9500_read_proximity(struct sx9500_data *data,
+				 const struct iio_chan_spec *chan,
+				 int *val)
+{
+	int ret;
+	__be16 regval;
+
+	ret = regmap_write(data->regmap, SX9500_REG_SENSOR_SEL, chan->channel);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_bulk_read(data->regmap, SX9500_REG_USE_MSB, &regval, 2);
+	if (ret < 0)
+		return ret;
+
+	*val = 32767 - (s16)be16_to_cpu(regval);
+
+	return IIO_VAL_INT;
+}
+
+static int sx9500_read_samp_freq(struct sx9500_data *data,
+				 int *val, int *val2)
+{
+	int ret;
+	unsigned int regval;
+
+	mutex_lock(&data->mutex);
+	ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, &regval);
+	mutex_unlock(&data->mutex);
+
+	if (ret < 0)
+		return ret;
+
+	regval = (regval & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT;
+	*val = sx9500_samp_freq_table[regval].val;
+	*val2 = sx9500_samp_freq_table[regval].val2;
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int sx9500_read_raw(struct iio_dev *indio_dev,
+			   const struct iio_chan_spec *chan,
+			   int *val, int *val2, long mask)
+{
+	struct sx9500_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (chan->type) {
+	case IIO_PROXIMITY:
+		switch (mask) {
+		case IIO_CHAN_INFO_RAW:
+			if (iio_buffer_enabled(indio_dev))
+				return -EBUSY;
+			mutex_lock(&data->mutex);
+			ret = sx9500_read_proximity(data, chan, val);
+			mutex_unlock(&data->mutex);
+			return ret;
+		case IIO_CHAN_INFO_SAMP_FREQ:
+			return sx9500_read_samp_freq(data, val, val2);
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static int sx9500_set_samp_freq(struct sx9500_data *data,
+				int val, int val2)
+{
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(sx9500_samp_freq_table); i++)
+		if (val == sx9500_samp_freq_table[i].val &&
+		    val2 == sx9500_samp_freq_table[i].val2)
+			break;
+
+	if (i == ARRAY_SIZE(sx9500_samp_freq_table))
+		return -EINVAL;
+
+	mutex_lock(&data->mutex);
+
+	ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
+				 SX9500_SCAN_PERIOD_MASK,
+				 i << SX9500_SCAN_PERIOD_SHIFT);
+
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static int sx9500_write_raw(struct iio_dev *indio_dev,
+			    const struct iio_chan_spec *chan,
+			    int val, int val2, long mask)
+{
+	struct sx9500_data *data = iio_priv(indio_dev);
+
+	switch (chan->type) {
+	case IIO_PROXIMITY:
+		switch (mask) {
+		case IIO_CHAN_INFO_SAMP_FREQ:
+			return sx9500_set_samp_freq(data, val, val2);
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static irqreturn_t sx9500_irq_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct sx9500_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 SX9500_REG_IRQ_SRC.  It
+	 * is not possible to do that here because regmap_read takes a
+	 * mutex.
+	 */
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t sx9500_irq_thread_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct sx9500_data *data = iio_priv(indio_dev);
+	int ret;
+	unsigned int val, chan;
+
+	mutex_lock(&data->mutex);
+
+	ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "i2c transfer error in irq\n");
+		goto out;
+	}
+
+	if (!(val & (SX9500_CLOSE_IRQ | SX9500_FAR_IRQ)))
+		goto out;
+
+	ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "i2c transfer error in irq\n");
+		goto out;
+	}
+
+	val >>= SX9500_PROXSTAT_SHIFT;
+	for (chan = 0; chan < SX9500_NUM_CHANNELS; chan++) {
+		int dir;
+		u64 ev;
+		bool new_prox = val & BIT(chan);
+
+		if (!data->event_enabled[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, iio_get_time_ns());
+		data->prox_stat[chan] = new_prox;
+	}
+
+out:
+	mutex_unlock(&data->mutex);
+
+	return IRQ_HANDLED;
+}
+
+static int sx9500_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 sx9500_data *data = iio_priv(indio_dev);
+
+	if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
+	    dir != IIO_EV_DIR_EITHER)
+		return -EINVAL;
+
+	return data->event_enabled[chan->channel];
+}
+
+static int sx9500_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 sx9500_data *data = iio_priv(indio_dev);
+	int ret, i;
+	bool any_active = false;
+	unsigned int irqmask;
+
+	if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
+	    dir != IIO_EV_DIR_EITHER)
+		return -EINVAL;
+
+	mutex_lock(&data->mutex);
+
+	data->event_enabled[chan->channel] = state;
+
+	for (i = 0; i < SX9500_NUM_CHANNELS; i++)
+		if (data->event_enabled[i]) {
+			any_active = true;
+			break;
+		}
+
+	irqmask = SX9500_CLOSE_IRQ | SX9500_FAR_IRQ;
+	ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
+				 irqmask, any_active ? irqmask : 0);
+
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
+	"2.500000 3.333333 5 6.666666 8.333333 11.111111 16.666666 33.333333");
+
+static struct attribute *sx9500_attributes[] = {
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group sx9500_attribute_group = {
+	.attrs = sx9500_attributes,
+};
+
+static const struct iio_info sx9500_info = {
+	.driver_module = THIS_MODULE,
+	.attrs = &sx9500_attribute_group,
+	.read_raw = &sx9500_read_raw,
+	.write_raw = &sx9500_write_raw,
+	.read_event_config = &sx9500_read_event_config,
+	.write_event_config = &sx9500_write_event_config,
+};
+
+static int sx9500_set_trigger_state(struct iio_trigger *trig,
+				    bool state)
+{
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+	struct sx9500_data *data = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&data->mutex);
+
+	ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
+				 SX9500_CONVDONE_IRQ,
+				 state ? SX9500_CONVDONE_IRQ : 0);
+	if (ret == 0)
+		data->trigger_enabled = state;
+
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static const struct iio_trigger_ops sx9500_trigger_ops = {
+	.set_trigger_state = sx9500_set_trigger_state,
+	.owner = THIS_MODULE,
+};
+
+static irqreturn_t sx9500_trigger_handler(int irq, void *private)
+{
+	struct iio_poll_func *pf = private;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct sx9500_data *data = iio_priv(indio_dev);
+	s16 *buf;
+	int val, bit, ret, i = 0;
+
+	buf = kzalloc(indio_dev->scan_bytes, GFP_KERNEL);
+	if (!buf) {
+		dev_err(&data->client->dev,
+			"failed to allocate memory in trigger handler\n");
+		return IRQ_HANDLED;
+	}
+
+	mutex_lock(&data->mutex);
+
+	for_each_set_bit(bit, indio_dev->buffer->scan_mask,
+			 indio_dev->masklength) {
+		ret = sx9500_read_proximity(data, &indio_dev->channels[bit],
+					    &val);
+		if (ret < 0)
+			goto out;
+
+		buf[i++] = val;
+	}
+
+	iio_push_to_buffers_with_timestamp(indio_dev, buf,
+					   iio_get_time_ns());
+
+out:
+	mutex_unlock(&data->mutex);
+
+	kfree(buf);
+
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+struct sx9500_reg_default {
+	u8 reg;
+	u8 def;
+};
+
+static const struct sx9500_reg_default sx9500_default_regs[] = {
+	{
+		.reg = SX9500_REG_PROX_CTRL1,
+		/* Shield enabled, small range. */
+		.def = 0x43,
+	},
+	{
+		.reg = SX9500_REG_PROX_CTRL2,
+		/* x8 gain, 167kHz frequency, finest resolution. */
+		.def = 0x77,
+	},
+	{
+		.reg = SX9500_REG_PROX_CTRL3,
+		/* Doze enabled, 2x scan period doze, no raw filter. */
+		.def = 0x40,
+	},
+	{
+		.reg = SX9500_REG_PROX_CTRL4,
+		/* Average threshold. */
+		.def = 0x30,
+	},
+	{
+		.reg = SX9500_REG_PROX_CTRL5,
+		/*
+		 * Debouncer off, lowest average negative filter,
+		 * highest average postive filter.
+		 */
+		.def = 0x0f,
+	},
+	{
+		.reg = SX9500_REG_PROX_CTRL6,
+		/* Proximity detection threshold: 280 */
+		.def = 0x0e,
+	},
+	{
+		.reg = SX9500_REG_PROX_CTRL7,
+		/*
+		 * No automatic compensation, compensate each pin
+		 * independently, proximity hysteresis: 32, close
+		 * debouncer off, far debouncer off.
+		 */
+		.def = 0x00,
+	},
+	{
+		.reg = SX9500_REG_PROX_CTRL8,
+		/* No stuck timeout, no periodic compensation. */
+		.def = 0x00,
+	},
+	{
+		.reg = SX9500_REG_PROX_CTRL0,
+		/* Scan period: 30ms, all sensors enabled. */
+		.def = 0x0f,
+	},
+};
+
+static int sx9500_init_device(struct iio_dev *indio_dev)
+{
+	struct sx9500_data *data = iio_priv(indio_dev);
+	int ret, i;
+	unsigned int val;
+
+	ret = regmap_write(data->regmap, SX9500_REG_IRQ_MSK, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(data->regmap, SX9500_REG_RESET,
+			   SX9500_SOFT_RESET);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(sx9500_default_regs); i++) {
+		ret = regmap_write(data->regmap,
+				   sx9500_default_regs[i].reg,
+				   sx9500_default_regs[i].def);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int sx9500_gpio_probe(struct i2c_client *client,
+			     struct sx9500_data *data)
+{
+	struct device *dev;
+	struct gpio_desc *gpio;
+	int ret;
+
+	if (!client)
+		return -EINVAL;
+
+	dev = &client->dev;
+
+	/* data ready gpio interrupt pin */
+	gpio = devm_gpiod_get_index(dev, SX9500_GPIO_NAME, 0);
+	if (IS_ERR(gpio)) {
+		dev_err(dev, "acpi gpio get index failed\n");
+		return PTR_ERR(gpio);
+	}
+
+	ret = gpiod_direction_input(gpio);
+	if (ret)
+		return ret;
+
+	ret = gpiod_to_irq(gpio);
+
+	dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
+
+	return ret;
+}
+
+static int sx9500_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int ret;
+	struct iio_dev *indio_dev;
+	struct sx9500_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);
+	data->trigger_enabled = false;
+
+	data->regmap = devm_regmap_init_i2c(client, &sx9500_regmap_config);
+	if (IS_ERR(data->regmap))
+		return PTR_ERR(data->regmap);
+
+	sx9500_init_device(indio_dev);
+
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->name = SX9500_DRIVER_NAME;
+	indio_dev->channels = sx9500_channels;
+	indio_dev->num_channels = ARRAY_SIZE(sx9500_channels);
+	indio_dev->info = &sx9500_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	i2c_set_clientdata(client, indio_dev);
+
+	if (client->irq <= 0)
+		client->irq = sx9500_gpio_probe(client, data);
+
+	if (client->irq > 0) {
+		ret = devm_request_threaded_irq(&client->dev, client->irq,
+				sx9500_irq_handler, sx9500_irq_thread_handler,
+				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				SX9500_IRQ_NAME, 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 = &sx9500_trigger_ops;
+		iio_trigger_set_drvdata(data->trig, indio_dev);
+
+		ret = iio_trigger_register(data->trig);
+		if (ret)
+			return ret;
+	}
+
+	ret = iio_triggered_buffer_setup(indio_dev, NULL,
+					 sx9500_trigger_handler, NULL);
+	if (ret < 0)
+		goto out_trigger_unregister;
+
+	ret = iio_device_register(indio_dev);
+	if (ret < 0)
+		goto out_buffer_cleanup;
+
+	return 0;
+
+out_buffer_cleanup:
+	if (client->irq > 0)
+		iio_triggered_buffer_cleanup(indio_dev);
+out_trigger_unregister:
+	iio_trigger_unregister(data->trig);
+
+	return ret;
+}
+
+static int sx9500_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct sx9500_data *data = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+	if (client->irq > 0)
+		iio_triggered_buffer_cleanup(indio_dev);
+	iio_trigger_unregister(data->trig);
+
+	return 0;
+}
+
+static const struct acpi_device_id sx9500_acpi_match[] = {
+	{"SSX9500", 0},
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, sx9500_acpi_match);
+
+static const struct i2c_device_id sx9500_id[] = {
+	{"sx9500", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, sx9500_id);
+
+static struct i2c_driver sx9500_driver = {
+	.driver = {
+		.name	= SX9500_DRIVER_NAME,
+		.acpi_match_table = ACPI_PTR(sx9500_acpi_match),
+	},
+	.probe		= sx9500_probe,
+	.remove		= sx9500_remove,
+	.id_table	= sx9500_id,
+};
+module_i2c_driver(sx9500_driver);
+
+MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
+MODULE_DESCRIPTION("Driver for Semtech SX9500 proximity sensor");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1


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