iio: driver for Semtech SX9500 proximity solution
authorVlad Dogaru <vlad.dogaru@intel.com>
Mon, 29 Dec 2014 12:41:14 +0000 (14:41 +0200)
committerJonathan Cameron <jic23@kernel.org>
Mon, 5 Jan 2015 18:59:42 +0000 (18:59 +0000)
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>
drivers/iio/proximity/Kconfig
drivers/iio/proximity/Makefile
drivers/iio/proximity/sx9500.c [new file with mode: 0644]

index 0c8cdf5..41a8d8f 100644 (file)
@@ -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
index 743adee..9818dc5 100644 (file)
@@ -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 (file)
index 0000000..74dff4e
--- /dev/null
@@ -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");