Re: [PATCH v3] iio: driver for Semtech SX9500 proximity solution

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On Thu, Dec 18, 2014 at 11:27:24PM +0100, Hartmut Knaack wrote:
> Vlad Dogaru schrieb am 15.12.2014 um 16:15:
> > 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@xxxxxxxxx>
> Reviewed-by: Hartmut Knaack <knaack.h@xxxxxx>
> > ---
> Looking good overall, no show-stoppers. Just 2 small things I would
> like to address (one I asked already before), please see inline.

You're right on both accounts, sorry I missed the superfluous typecast
in the previous iteration.  Will fix in v4.

> > 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..82076d6
> > --- /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));
> There is no real need for double negation, as a bool interprets 0 as false
> and everything else as true.
> > +
> > +		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++] = (s16)val;
> What is the benefit of treating val as s16?
> > +	}
> > +
> > +	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@xxxxxxxxx>");
> > +MODULE_DESCRIPTION("Driver for Semtech SX9500 proximity sensor");
> > +MODULE_LICENSE("GPL v2");
> > 
> 
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