iio: driver for Semtech SX9500 proximity solution

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>
Reviewed-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

3 files changed, 770 insertions, 0 deletions

diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
index 0c8cdf58f6a1..41a8d8ffa0de 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 743adee1c8bf..9818dc562abd 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 000000000000..74dff4e4a11a
--- /dev/null
+++ b/drivers/iio/proximity/sx9500.c
@@ -0,0 +1,752 @@
+/*
+ * 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;
+        u16 *buffer;
+};
+
+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;
+        if (any_active)
+                ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
+                                         irqmask, irqmask);
+        else
+                ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
+                                         irqmask, 0);
+
+        mutex_unlock(&data->mutex);
+
+        return ret;
+}
+
+static int sx9500_update_scan_mode(struct iio_dev *indio_dev,
+                                   const unsigned long *scan_mask)
+{
+        struct sx9500_data *data = iio_priv(indio_dev);
+
+        mutex_lock(&data->mutex);
+        kfree(data->buffer);
+        data->buffer = kzalloc(indio_dev->scan_bytes, GFP_KERNEL);
+        mutex_unlock(&data->mutex);
+
+        if (data->buffer == NULL)
+                return -ENOMEM;
+
+        return 0;
+}
+
+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,
+        .update_scan_mode = &sx9500_update_scan_mode,
+};
+
+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);
+        int val, bit, ret, i = 0;
+
+        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;
+
+                data->buffer[i++] = val;
+        }
+
+        iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
+                                           iio_get_time_ns());
+
+out:
+        mutex_unlock(&data->mutex);
+
+        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:
+        iio_triggered_buffer_cleanup(indio_dev);
+out_trigger_unregister:
+        if (client->irq > 0)
+                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);
+        iio_triggered_buffer_cleanup(indio_dev);
+        if (client->irq > 0)
+                iio_trigger_unregister(data->trig);
+        kfree(data->buffer);
+
+        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");