[mirror_ubuntu-bionic-kernel.git] / drivers / iio / light / stk3310.c

/**
 * Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor
 *
 * Copyright (c) 2015, Intel Corporation.
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.
 */

#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#define STK3310_REG_STATE			0x00
#define STK3310_REG_PSCTRL			0x01
#define STK3310_REG_ALSCTRL			0x02
#define STK3310_REG_INT				0x04
#define STK3310_REG_THDH_PS			0x06
#define STK3310_REG_THDL_PS			0x08
#define STK3310_REG_FLAG			0x10
#define STK3310_REG_PS_DATA_MSB			0x11
#define STK3310_REG_PS_DATA_LSB			0x12
#define STK3310_REG_ALS_DATA_MSB		0x13
#define STK3310_REG_ALS_DATA_LSB		0x14
#define STK3310_REG_ID				0x3E
#define STK3310_MAX_REG				0x80

#define STK3310_STATE_EN_PS			BIT(0)
#define STK3310_STATE_EN_ALS			BIT(1)
#define STK3310_STATE_STANDBY			0x00

#define STK3310_CHIP_ID_VAL			0x13
#define STK3311_CHIP_ID_VAL			0x1D
#define STK3310_PSINT_EN			0x01
#define STK3310_PS_MAX_VAL			0xFFFF

#define STK3310_DRIVER_NAME			"stk3310"
#define STK3310_REGMAP_NAME			"stk3310_regmap"
#define STK3310_EVENT				"stk3310_event"

#define STK3310_SCALE_AVAILABLE			"6.4 1.6 0.4 0.1"

#define STK3310_IT_AVAILABLE \
	"0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
	"0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
	"3.031040 6.062080"

#define STK3310_REGFIELD(name)						    \
	do {								    \
		data->reg_##name =					    \
			devm_regmap_field_alloc(&client->dev, regmap,	    \
				stk3310_reg_field_##name);		    \
		if (IS_ERR(data->reg_##name)) {				    \
			dev_err(&client->dev, "reg field alloc failed.\n"); \
			return PTR_ERR(data->reg_##name);		    \
		}							    \
	} while (0)

static const struct reg_field stk3310_reg_field_state =
				REG_FIELD(STK3310_REG_STATE, 0, 2);
static const struct reg_field stk3310_reg_field_als_gain =
				REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
static const struct reg_field stk3310_reg_field_ps_gain =
				REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
static const struct reg_field stk3310_reg_field_als_it =
				REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
static const struct reg_field stk3310_reg_field_ps_it =
				REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
static const struct reg_field stk3310_reg_field_int_ps =
				REG_FIELD(STK3310_REG_INT, 0, 2);
static const struct reg_field stk3310_reg_field_flag_psint =
				REG_FIELD(STK3310_REG_FLAG, 4, 4);
static const struct reg_field stk3310_reg_field_flag_nf =
				REG_FIELD(STK3310_REG_FLAG, 0, 0);

/* Estimate maximum proximity values with regard to measurement scale. */
static const int stk3310_ps_max[4] = {
	STK3310_PS_MAX_VAL / 640,
	STK3310_PS_MAX_VAL / 160,
	STK3310_PS_MAX_VAL /  40,
	STK3310_PS_MAX_VAL /  10
};

static const int stk3310_scale_table[][2] = {
	{6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
};

/* Integration time in seconds, microseconds */
static const int stk3310_it_table[][2] = {
	{0, 185},	{0, 370},	{0, 741},	{0, 1480},
	{0, 2960},	{0, 5920},	{0, 11840},	{0, 23680},
	{0, 47360},	{0, 94720},	{0, 189440},	{0, 378880},
	{0, 757760},	{1, 515520},	{3, 31040},	{6, 62080},
};

struct stk3310_data {
	struct i2c_client *client;
	struct mutex lock;
	bool als_enabled;
	bool ps_enabled;
	u64 timestamp;
	struct regmap *regmap;
	struct regmap_field *reg_state;
	struct regmap_field *reg_als_gain;
	struct regmap_field *reg_ps_gain;
	struct regmap_field *reg_als_it;
	struct regmap_field *reg_ps_it;
	struct regmap_field *reg_int_ps;
	struct regmap_field *reg_flag_psint;
	struct regmap_field *reg_flag_nf;
};

static const struct iio_event_spec stk3310_events[] = {
	/* Proximity event */
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_RISING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
				 BIT(IIO_EV_INFO_ENABLE),
	},
	/* Out-of-proximity event */
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_FALLING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
				 BIT(IIO_EV_INFO_ENABLE),
	},
};

static const struct iio_chan_spec stk3310_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE) |
			BIT(IIO_CHAN_INFO_INT_TIME),
	},
	{
		.type = IIO_PROXIMITY,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE) |
			BIT(IIO_CHAN_INFO_INT_TIME),
		.event_spec = stk3310_events,
		.num_event_specs = ARRAY_SIZE(stk3310_events),
	}
};

static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);

static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);

static IIO_CONST_ATTR(in_illuminance_integration_time_available,
		      STK3310_IT_AVAILABLE);

static IIO_CONST_ATTR(in_proximity_integration_time_available,
		      STK3310_IT_AVAILABLE);

static struct attribute *stk3310_attributes[] = {
	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
	&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
	&iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group stk3310_attribute_group = {
	.attrs = stk3310_attributes
};

static int stk3310_get_index(const int table[][2], int table_size,
			     int val, int val2)
{
	int i;

	for (i = 0; i < table_size; i++) {
		if (val == table[i][0] && val2 == table[i][1])
			return i;
	}

	return -EINVAL;
}

static int stk3310_read_event(struct iio_dev *indio_dev,
			      const struct iio_chan_spec *chan,
			      enum iio_event_type type,
			      enum iio_event_direction dir,
			      enum iio_event_info info,
			      int *val, int *val2)
{
	u8 reg;
	__be16 buf;
	int ret;
	struct stk3310_data *data = iio_priv(indio_dev);

	if (info != IIO_EV_INFO_VALUE)
		return -EINVAL;

	/* Only proximity interrupts are implemented at the moment. */
	if (dir == IIO_EV_DIR_RISING)
		reg = STK3310_REG_THDH_PS;
	else if (dir == IIO_EV_DIR_FALLING)
		reg = STK3310_REG_THDL_PS;
	else
		return -EINVAL;

	mutex_lock(&data->lock);
	ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
	mutex_unlock(&data->lock);
	if (ret < 0) {
		dev_err(&data->client->dev, "register read failed\n");
		return ret;
	}
	*val = be16_to_cpu(buf);

	return IIO_VAL_INT;
}

static int stk3310_write_event(struct iio_dev *indio_dev,
			       const struct iio_chan_spec *chan,
			       enum iio_event_type type,
			       enum iio_event_direction dir,
			       enum iio_event_info info,
			       int val, int val2)
{
	u8 reg;
	__be16 buf;
	int ret;
	unsigned int index;
	struct stk3310_data *data = iio_priv(indio_dev);
	struct i2c_client *client = data->client;

	ret = regmap_field_read(data->reg_ps_gain, &index);
	if (ret < 0)
		return ret;

	if (val < 0 || val > stk3310_ps_max[index])
		return -EINVAL;

	if (dir == IIO_EV_DIR_RISING)
		reg = STK3310_REG_THDH_PS;
	else if (dir == IIO_EV_DIR_FALLING)
		reg = STK3310_REG_THDL_PS;
	else
		return -EINVAL;

	buf = cpu_to_be16(val);
	ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
	if (ret < 0)
		dev_err(&client->dev, "failed to set PS threshold!\n");

	return ret;
}

static int stk3310_read_event_config(struct iio_dev *indio_dev,
				     const struct iio_chan_spec *chan,
				     enum iio_event_type type,
				     enum iio_event_direction dir)
{
	unsigned int event_val;
	int ret;
	struct stk3310_data *data = iio_priv(indio_dev);

	ret = regmap_field_read(data->reg_int_ps, &event_val);
	if (ret < 0)
		return ret;

	return event_val;
}

static int stk3310_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)
{
	int ret;
	struct stk3310_data *data = iio_priv(indio_dev);
	struct i2c_client *client = data->client;

	if (state < 0 || state > 7)
		return -EINVAL;

	/* Set INT_PS value */
	mutex_lock(&data->lock);
	ret = regmap_field_write(data->reg_int_ps, state);
	if (ret < 0)
		dev_err(&client->dev, "failed to set interrupt mode\n");
	mutex_unlock(&data->lock);

	return ret;
}

static int stk3310_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	u8 reg;
	__be16 buf;
	int ret;
	unsigned int index;
	struct stk3310_data *data = iio_priv(indio_dev);
	struct i2c_client *client = data->client;

	if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
		return -EINVAL;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (chan->type == IIO_LIGHT)
			reg = STK3310_REG_ALS_DATA_MSB;
		else
			reg = STK3310_REG_PS_DATA_MSB;

		mutex_lock(&data->lock);
		ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
		if (ret < 0) {
			dev_err(&client->dev, "register read failed\n");
			mutex_unlock(&data->lock);
			return ret;
		}
		*val = be16_to_cpu(buf);
		mutex_unlock(&data->lock);
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_INT_TIME:
		if (chan->type == IIO_LIGHT)
			ret = regmap_field_read(data->reg_als_it, &index);
		else
			ret = regmap_field_read(data->reg_ps_it, &index);
		if (ret < 0)
			return ret;

		*val = stk3310_it_table[index][0];
		*val2 = stk3310_it_table[index][1];
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_SCALE:
		if (chan->type == IIO_LIGHT)
			ret = regmap_field_read(data->reg_als_gain, &index);
		else
			ret = regmap_field_read(data->reg_ps_gain, &index);
		if (ret < 0)
			return ret;

		*val = stk3310_scale_table[index][0];
		*val2 = stk3310_scale_table[index][1];
		return IIO_VAL_INT_PLUS_MICRO;
	}

	return -EINVAL;
}

static int stk3310_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	int ret;
	int index;
	struct stk3310_data *data = iio_priv(indio_dev);

	if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
		return -EINVAL;

	switch (mask) {
	case IIO_CHAN_INFO_INT_TIME:
		index = stk3310_get_index(stk3310_it_table,
					  ARRAY_SIZE(stk3310_it_table),
					  val, val2);
		if (index < 0)
			return -EINVAL;
		mutex_lock(&data->lock);
		if (chan->type == IIO_LIGHT)
			ret = regmap_field_write(data->reg_als_it, index);
		else
			ret = regmap_field_write(data->reg_ps_it, index);
		if (ret < 0)
			dev_err(&data->client->dev,
				"sensor configuration failed\n");
		mutex_unlock(&data->lock);
		return ret;

	case IIO_CHAN_INFO_SCALE:
		index = stk3310_get_index(stk3310_scale_table,
					  ARRAY_SIZE(stk3310_scale_table),
					  val, val2);
		if (index < 0)
			return -EINVAL;
		mutex_lock(&data->lock);
		if (chan->type == IIO_LIGHT)
			ret = regmap_field_write(data->reg_als_gain, index);
		else
			ret = regmap_field_write(data->reg_ps_gain, index);
		if (ret < 0)
			dev_err(&data->client->dev,
				"sensor configuration failed\n");
		mutex_unlock(&data->lock);
		return ret;
	}

	return -EINVAL;
}

static const struct iio_info stk3310_info = {
	.read_raw		= stk3310_read_raw,
	.write_raw		= stk3310_write_raw,
	.attrs			= &stk3310_attribute_group,
	.read_event_value	= stk3310_read_event,
	.write_event_value	= stk3310_write_event,
	.read_event_config	= stk3310_read_event_config,
	.write_event_config	= stk3310_write_event_config,
};

static int stk3310_set_state(struct stk3310_data *data, u8 state)
{
	int ret;
	struct i2c_client *client = data->client;

	/* 3-bit state; 0b100 is not supported. */
	if (state > 7 || state == 4)
		return -EINVAL;

	mutex_lock(&data->lock);
	ret = regmap_field_write(data->reg_state, state);
	if (ret < 0) {
		dev_err(&client->dev, "failed to change sensor state\n");
	} else if (state != STK3310_STATE_STANDBY) {
		/* Don't reset the 'enabled' flags if we're going in standby */
		data->ps_enabled  = !!(state & STK3310_STATE_EN_PS);
		data->als_enabled = !!(state & STK3310_STATE_EN_ALS);
	}
	mutex_unlock(&data->lock);

	return ret;
}

static int stk3310_init(struct iio_dev *indio_dev)
{
	int ret;
	int chipid;
	u8 state;
	struct stk3310_data *data = iio_priv(indio_dev);
	struct i2c_client *client = data->client;

	ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
	if (ret < 0)
		return ret;

	if (chipid != STK3310_CHIP_ID_VAL &&
	    chipid != STK3311_CHIP_ID_VAL) {
		dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
		return -ENODEV;
	}

	state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
	ret = stk3310_set_state(data, state);
	if (ret < 0) {
		dev_err(&client->dev, "failed to enable sensor");
		return ret;
	}

	/* Enable PS interrupts */
	ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
	if (ret < 0)
		dev_err(&client->dev, "failed to enable interrupts!\n");

	return ret;
}

static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case STK3310_REG_ALS_DATA_MSB:
	case STK3310_REG_ALS_DATA_LSB:
	case STK3310_REG_PS_DATA_LSB:
	case STK3310_REG_PS_DATA_MSB:
	case STK3310_REG_FLAG:
		return true;
	default:
		return false;
	}
}

static struct regmap_config stk3310_regmap_config = {
	.name = STK3310_REGMAP_NAME,
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = STK3310_MAX_REG,
	.cache_type = REGCACHE_RBTREE,
	.volatile_reg = stk3310_is_volatile_reg,
};

static int stk3310_regmap_init(struct stk3310_data *data)
{
	struct regmap *regmap;
	struct i2c_client *client;

	client = data->client;
	regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(&client->dev, "regmap initialization failed.\n");
		return PTR_ERR(regmap);
	}
	data->regmap = regmap;

	STK3310_REGFIELD(state);
	STK3310_REGFIELD(als_gain);
	STK3310_REGFIELD(ps_gain);
	STK3310_REGFIELD(als_it);
	STK3310_REGFIELD(ps_it);
	STK3310_REGFIELD(int_ps);
	STK3310_REGFIELD(flag_psint);
	STK3310_REGFIELD(flag_nf);

	return 0;
}

static irqreturn_t stk3310_irq_handler(int irq, void *private)
{
	struct iio_dev *indio_dev = private;
	struct stk3310_data *data = iio_priv(indio_dev);

	data->timestamp = iio_get_time_ns(indio_dev);

	return IRQ_WAKE_THREAD;
}

static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
{
	int ret;
	unsigned int dir;
	u64 event;

	struct iio_dev *indio_dev = private;
	struct stk3310_data *data = iio_priv(indio_dev);

	/* Read FLAG_NF to figure out what threshold has been met. */
	mutex_lock(&data->lock);
	ret = regmap_field_read(data->reg_flag_nf, &dir);
	if (ret < 0) {
		dev_err(&data->client->dev, "register read failed\n");
		mutex_unlock(&data->lock);
		return ret;
	}
	event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
				     IIO_EV_TYPE_THRESH,
				     (dir ? IIO_EV_DIR_FALLING :
					    IIO_EV_DIR_RISING));
	iio_push_event(indio_dev, event, data->timestamp);

	/* Reset the interrupt flag */
	ret = regmap_field_write(data->reg_flag_psint, 0);
	if (ret < 0)
		dev_err(&data->client->dev, "failed to reset interrupts\n");
	mutex_unlock(&data->lock);

	return IRQ_HANDLED;
}

static int stk3310_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	int ret;
	struct iio_dev *indio_dev;
	struct stk3310_data *data;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev) {
		dev_err(&client->dev, "iio allocation failed!\n");
		return -ENOMEM;
	}

	data = iio_priv(indio_dev);
	data->client = client;
	i2c_set_clientdata(client, indio_dev);
	mutex_init(&data->lock);

	ret = stk3310_regmap_init(data);
	if (ret < 0)
		return ret;

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &stk3310_info;
	indio_dev->name = STK3310_DRIVER_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = stk3310_channels;
	indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);

	ret = stk3310_init(indio_dev);
	if (ret < 0)
		return ret;

	if (client->irq > 0) {
		ret = devm_request_threaded_irq(&client->dev, client->irq,
						stk3310_irq_handler,
						stk3310_irq_event_handler,
						IRQF_TRIGGER_FALLING |
						IRQF_ONESHOT,
						STK3310_EVENT, indio_dev);
		if (ret < 0) {
			dev_err(&client->dev, "request irq %d failed\n",
				client->irq);
			goto err_standby;
		}
	}

	ret = iio_device_register(indio_dev);
	if (ret < 0) {
		dev_err(&client->dev, "device_register failed\n");
		goto err_standby;
	}

	return 0;

err_standby:
	stk3310_set_state(data, STK3310_STATE_STANDBY);
	return ret;
}

static int stk3310_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);
	return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
}

#ifdef CONFIG_PM_SLEEP
static int stk3310_suspend(struct device *dev)
{
	struct stk3310_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

	return stk3310_set_state(data, STK3310_STATE_STANDBY);
}

static int stk3310_resume(struct device *dev)
{
	u8 state = 0;
	struct stk3310_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	if (data->ps_enabled)
		state |= STK3310_STATE_EN_PS;
	if (data->als_enabled)
		state |= STK3310_STATE_EN_ALS;

	return stk3310_set_state(data, state);
}

static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);

#define STK3310_PM_OPS (&stk3310_pm_ops)
#else
#define STK3310_PM_OPS NULL
#endif

static const struct i2c_device_id stk3310_i2c_id[] = {
	{"STK3310", 0},
	{"STK3311", 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);

static const struct acpi_device_id stk3310_acpi_id[] = {
	{"STK3310", 0},
	{"STK3311", 0},
	{}
};

MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);

static struct i2c_driver stk3310_driver = {
	.driver = {
		.name = "stk3310",
		.pm = STK3310_PM_OPS,
		.acpi_match_table = ACPI_PTR(stk3310_acpi_id),
	},
	.probe =            stk3310_probe,
	.remove =           stk3310_remove,
	.id_table =         stk3310_i2c_id,
};

module_i2c_driver(stk3310_driver);

MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
be9e6229 TB	1	/**
	2	* Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor
	3	*
	4	* Copyright (c) 2015, Intel Corporation.
	5	*
	6	* This file is subject to the terms and conditions of version 2 of
	7	* the GNU General Public License. See the file COPYING in the main
	8	* directory of this archive for more details.
	9	*
	10	* IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.
	11	*/
	12
	13	#include <linux/acpi.h>
	14	#include <linux/i2c.h>
3dd477ac	15	#include <linux/interrupt.h>
be9e6229 TB	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/regmap.h>
3dd477ac	19	#include <linux/iio/events.h>
be9e6229 TB	20	#include <linux/iio/iio.h>
	21	#include <linux/iio/sysfs.h>
	22
	23	#define STK3310_REG_STATE 0x00
	24	#define STK3310_REG_PSCTRL 0x01
	25	#define STK3310_REG_ALSCTRL 0x02
3dd477ac TB	26	#define STK3310_REG_INT 0x04
	27	#define STK3310_REG_THDH_PS 0x06
	28	#define STK3310_REG_THDL_PS 0x08
	29	#define STK3310_REG_FLAG 0x10
be9e6229 TB	30	#define STK3310_REG_PS_DATA_MSB 0x11
	31	#define STK3310_REG_PS_DATA_LSB 0x12
	32	#define STK3310_REG_ALS_DATA_MSB 0x13
	33	#define STK3310_REG_ALS_DATA_LSB 0x14
	34	#define STK3310_REG_ID 0x3E
	35	#define STK3310_MAX_REG 0x80
	36
952c3aa3 HK	37	#define STK3310_STATE_EN_PS BIT(0)
952c3aa3 HK	38	#define STK3310_STATE_EN_ALS BIT(1)
be9e6229 TB	39	#define STK3310_STATE_STANDBY 0x00
	40
	41	#define STK3310_CHIP_ID_VAL 0x13
	42	#define STK3311_CHIP_ID_VAL 0x1D
3dd477ac	43	#define STK3310_PSINT_EN 0x01
be9e6229 TB	44	#define STK3310_PS_MAX_VAL 0xFFFF
	45
	46	#define STK3310_DRIVER_NAME "stk3310"
	47	#define STK3310_REGMAP_NAME "stk3310_regmap"
3dd477ac	48	#define STK3310_EVENT "stk3310_event"
be9e6229 TB	49
	50	#define STK3310_SCALE_AVAILABLE "6.4 1.6 0.4 0.1"
	51
	52	#define STK3310_IT_AVAILABLE \
	53	"0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
	54	"0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
	55	"3.031040 6.062080"
	56
	57	#define STK3310_REGFIELD(name) \
	58	do { \
	59	data->reg_##name = \
	60	devm_regmap_field_alloc(&client->dev, regmap, \
	61	stk3310_reg_field_##name); \
	62	if (IS_ERR(data->reg_##name)) { \
	63	dev_err(&client->dev, "reg field alloc failed.\n"); \
	64	return PTR_ERR(data->reg_##name); \
	65	} \
	66	} while (0)
	67
	68	static const struct reg_field stk3310_reg_field_state =
	69	REG_FIELD(STK3310_REG_STATE, 0, 2);
	70	static const struct reg_field stk3310_reg_field_als_gain =
	71	REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
	72	static const struct reg_field stk3310_reg_field_ps_gain =
	73	REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
	74	static const struct reg_field stk3310_reg_field_als_it =
	75	REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
	76	static const struct reg_field stk3310_reg_field_ps_it =
	77	REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
3dd477ac TB	78	static const struct reg_field stk3310_reg_field_int_ps =
	79	REG_FIELD(STK3310_REG_INT, 0, 2);
	80	static const struct reg_field stk3310_reg_field_flag_psint =
	81	REG_FIELD(STK3310_REG_FLAG, 4, 4);
	82	static const struct reg_field stk3310_reg_field_flag_nf =
	83	REG_FIELD(STK3310_REG_FLAG, 0, 0);
0f16fc8b TB	84
0f16fc8b TB	85	/* Estimate maximum proximity values with regard to measurement scale. */
be9e6229	86	static const int stk3310_ps_max[4] = {
0f16fc8b TB	87	STK3310_PS_MAX_VAL / 640,
	88	STK3310_PS_MAX_VAL / 160,
	89	STK3310_PS_MAX_VAL / 40,
	90	STK3310_PS_MAX_VAL / 10
be9e6229 TB	91	};
	92
	93	static const int stk3310_scale_table[][2] = {
	94	{6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
	95	};
	96
	97	/* Integration time in seconds, microseconds */
	98	static const int stk3310_it_table[][2] = {
	99	{0, 185}, {0, 370}, {0, 741}, {0, 1480},
	100	{0, 2960}, {0, 5920}, {0, 11840}, {0, 23680},
	101	{0, 47360}, {0, 94720}, {0, 189440}, {0, 378880},
	102	{0, 757760}, {1, 515520}, {3, 31040}, {6, 62080},
	103	};
	104
	105	struct stk3310_data {
	106	struct i2c_client *client;
	107	struct mutex lock;
	108	bool als_enabled;
	109	bool ps_enabled;
3dd477ac	110	u64 timestamp;
be9e6229 TB	111	struct regmap *regmap;
	112	struct regmap_field *reg_state;
	113	struct regmap_field *reg_als_gain;
	114	struct regmap_field *reg_ps_gain;
	115	struct regmap_field *reg_als_it;
	116	struct regmap_field *reg_ps_it;
3dd477ac TB	117	struct regmap_field *reg_int_ps;
	118	struct regmap_field *reg_flag_psint;
	119	struct regmap_field *reg_flag_nf;
	120	};
	121
	122	static const struct iio_event_spec stk3310_events[] = {
	123	/* Proximity event */
	124	{
	125	.type = IIO_EV_TYPE_THRESH,
0f16fc8b	126	.dir = IIO_EV_DIR_RISING,
3dd477ac TB	127	.mask_separate = BIT(IIO_EV_INFO_VALUE) \|
	128	BIT(IIO_EV_INFO_ENABLE),
	129	},
	130	/* Out-of-proximity event */
	131	{
	132	.type = IIO_EV_TYPE_THRESH,
0f16fc8b	133	.dir = IIO_EV_DIR_FALLING,
3dd477ac TB	134	.mask_separate = BIT(IIO_EV_INFO_VALUE) \|
	135	BIT(IIO_EV_INFO_ENABLE),
	136	},
be9e6229 TB	137	};
	138
	139	static const struct iio_chan_spec stk3310_channels[] = {
	140	{
	141	.type = IIO_LIGHT,
	142	.info_mask_separate =
	143	BIT(IIO_CHAN_INFO_RAW) \|
	144	BIT(IIO_CHAN_INFO_SCALE) \|
	145	BIT(IIO_CHAN_INFO_INT_TIME),
	146	},
	147	{
	148	.type = IIO_PROXIMITY,
	149	.info_mask_separate =
	150	BIT(IIO_CHAN_INFO_RAW) \|
	151	BIT(IIO_CHAN_INFO_SCALE) \|
	152	BIT(IIO_CHAN_INFO_INT_TIME),
3dd477ac TB	153	.event_spec = stk3310_events,
3dd477ac TB	154	.num_event_specs = ARRAY_SIZE(stk3310_events),
be9e6229 TB	155	}
	156	};
	157
	158	static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
	159
	160	static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
	161
	162	static IIO_CONST_ATTR(in_illuminance_integration_time_available,
	163	STK3310_IT_AVAILABLE);
	164
	165	static IIO_CONST_ATTR(in_proximity_integration_time_available,
	166	STK3310_IT_AVAILABLE);
	167
	168	static struct attribute *stk3310_attributes[] = {
	169	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
	170	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
	171	&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
	172	&iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
	173	NULL,
	174	};
	175
	176	static const struct attribute_group stk3310_attribute_group = {
	177	.attrs = stk3310_attributes
	178	};
	179
	180	static int stk3310_get_index(const int table[][2], int table_size,
	181	int val, int val2)
	182	{
	183	int i;
	184
	185	for (i = 0; i < table_size; i++) {
	186	if (val == table[i][0] && val2 == table[i][1])
	187	return i;
	188	}
	189
	190	return -EINVAL;
	191	}
	192
3dd477ac TB	193	static int stk3310_read_event(struct iio_dev *indio_dev,
	194	const struct iio_chan_spec *chan,
	195	enum iio_event_type type,
	196	enum iio_event_direction dir,
	197	enum iio_event_info info,
	198	int val, int val2)
	199	{
	200	u8 reg;
423ad0c4	201	__be16 buf;
3dd477ac	202	int ret;
3dd477ac TB	203	struct stk3310_data *data = iio_priv(indio_dev);
	204
	205	if (info != IIO_EV_INFO_VALUE)
	206	return -EINVAL;
	207
0f16fc8b	208	/* Only proximity interrupts are implemented at the moment. */
3dd477ac	209	if (dir == IIO_EV_DIR_RISING)
3dd477ac	210	reg = STK3310_REG_THDH_PS;
0f16fc8b TB	211	else if (dir == IIO_EV_DIR_FALLING)
0f16fc8b TB	212	reg = STK3310_REG_THDL_PS;
3dd477ac TB	213	else
	214	return -EINVAL;
	215
	216	mutex_lock(&data->lock);
	217	ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
	218	mutex_unlock(&data->lock);
	219	if (ret < 0) {
	220	dev_err(&data->client->dev, "register read failed\n");
	221	return ret;
	222	}
423ad0c4	223	*val = be16_to_cpu(buf);
3dd477ac TB	224
	225	return IIO_VAL_INT;
	226	}
	227
	228	static int stk3310_write_event(struct iio_dev *indio_dev,
	229	const struct iio_chan_spec *chan,
	230	enum iio_event_type type,
	231	enum iio_event_direction dir,
	232	enum iio_event_info info,
	233	int val, int val2)
	234	{
	235	u8 reg;
423ad0c4	236	__be16 buf;
3dd477ac TB	237	int ret;
	238	unsigned int index;
	239	struct stk3310_data *data = iio_priv(indio_dev);
	240	struct i2c_client *client = data->client;
	241
7c7a9eea HK	242	ret = regmap_field_read(data->reg_ps_gain, &index);
	243	if (ret < 0)
	244	return ret;
	245
	246	if (val < 0 \|\| val > stk3310_ps_max[index])
3dd477ac TB	247	return -EINVAL;
	248
	249	if (dir == IIO_EV_DIR_RISING)
3dd477ac	250	reg = STK3310_REG_THDH_PS;
0f16fc8b TB	251	else if (dir == IIO_EV_DIR_FALLING)
0f16fc8b TB	252	reg = STK3310_REG_THDL_PS;
3dd477ac TB	253	else
	254	return -EINVAL;
	255
423ad0c4	256	buf = cpu_to_be16(val);
3dd477ac TB	257	ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
	258	if (ret < 0)
	259	dev_err(&client->dev, "failed to set PS threshold!\n");
	260
	261	return ret;
	262	}
	263
	264	static int stk3310_read_event_config(struct iio_dev *indio_dev,
	265	const struct iio_chan_spec *chan,
	266	enum iio_event_type type,
	267	enum iio_event_direction dir)
	268	{
	269	unsigned int event_val;
7c7a9eea	270	int ret;
3dd477ac TB	271	struct stk3310_data *data = iio_priv(indio_dev);
3dd477ac TB	272
7c7a9eea HK	273	ret = regmap_field_read(data->reg_int_ps, &event_val);
	274	if (ret < 0)
	275	return ret;
3dd477ac TB	276
	277	return event_val;
	278	}
	279
	280	static int stk3310_write_event_config(struct iio_dev *indio_dev,
	281	const struct iio_chan_spec *chan,
	282	enum iio_event_type type,
	283	enum iio_event_direction dir,
	284	int state)
	285	{
	286	int ret;
	287	struct stk3310_data *data = iio_priv(indio_dev);
	288	struct i2c_client *client = data->client;
	289
	290	if (state < 0 \|\| state > 7)
	291	return -EINVAL;
	292
	293	/* Set INT_PS value */
	294	mutex_lock(&data->lock);
	295	ret = regmap_field_write(data->reg_int_ps, state);
	296	if (ret < 0)
	297	dev_err(&client->dev, "failed to set interrupt mode\n");
	298	mutex_unlock(&data->lock);
	299
	300	return ret;
	301	}
	302
be9e6229 TB	303	static int stk3310_read_raw(struct iio_dev *indio_dev,
	304	struct iio_chan_spec const *chan,
	305	int val, int val2, long mask)
	306	{
	307	u8 reg;
423ad0c4	308	__be16 buf;
be9e6229 TB	309	int ret;
	310	unsigned int index;
	311	struct stk3310_data *data = iio_priv(indio_dev);
	312	struct i2c_client *client = data->client;
	313
7c7a9eea HK	314	if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
	315	return -EINVAL;
	316
be9e6229 TB	317	switch (mask) {
	318	case IIO_CHAN_INFO_RAW:
	319	if (chan->type == IIO_LIGHT)
	320	reg = STK3310_REG_ALS_DATA_MSB;
be9e6229	321	else
7c7a9eea HK	322	reg = STK3310_REG_PS_DATA_MSB;
7c7a9eea HK	323
be9e6229 TB	324	mutex_lock(&data->lock);
	325	ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
	326	if (ret < 0) {
	327	dev_err(&client->dev, "register read failed\n");
	328	mutex_unlock(&data->lock);
	329	return ret;
	330	}
423ad0c4	331	*val = be16_to_cpu(buf);
be9e6229 TB	332	mutex_unlock(&data->lock);
	333	return IIO_VAL_INT;
	334	case IIO_CHAN_INFO_INT_TIME:
	335	if (chan->type == IIO_LIGHT)
7c7a9eea	336	ret = regmap_field_read(data->reg_als_it, &index);
be9e6229	337	else
7c7a9eea HK	338	ret = regmap_field_read(data->reg_ps_it, &index);
	339	if (ret < 0)
	340	return ret;
	341
be9e6229 TB	342	*val = stk3310_it_table[index][0];
	343	*val2 = stk3310_it_table[index][1];
	344	return IIO_VAL_INT_PLUS_MICRO;
	345	case IIO_CHAN_INFO_SCALE:
	346	if (chan->type == IIO_LIGHT)
7c7a9eea	347	ret = regmap_field_read(data->reg_als_gain, &index);
be9e6229	348	else
7c7a9eea HK	349	ret = regmap_field_read(data->reg_ps_gain, &index);
	350	if (ret < 0)
	351	return ret;
	352
be9e6229 TB	353	*val = stk3310_scale_table[index][0];
	354	*val2 = stk3310_scale_table[index][1];
	355	return IIO_VAL_INT_PLUS_MICRO;
	356	}
	357
	358	return -EINVAL;
	359	}
	360
	361	static int stk3310_write_raw(struct iio_dev *indio_dev,
	362	struct iio_chan_spec const *chan,
	363	int val, int val2, long mask)
	364	{
	365	int ret;
ed6e75c7	366	int index;
be9e6229 TB	367	struct stk3310_data *data = iio_priv(indio_dev);
be9e6229 TB	368
7c7a9eea HK	369	if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
	370	return -EINVAL;
	371
be9e6229 TB	372	switch (mask) {
	373	case IIO_CHAN_INFO_INT_TIME:
	374	index = stk3310_get_index(stk3310_it_table,
	375	ARRAY_SIZE(stk3310_it_table),
	376	val, val2);
	377	if (index < 0)
	378	return -EINVAL;
	379	mutex_lock(&data->lock);
	380	if (chan->type == IIO_LIGHT)
	381	ret = regmap_field_write(data->reg_als_it, index);
	382	else
	383	ret = regmap_field_write(data->reg_ps_it, index);
	384	if (ret < 0)
	385	dev_err(&data->client->dev,
5b958f11	386	"sensor configuration failed\n");
be9e6229 TB	387	mutex_unlock(&data->lock);
	388	return ret;
	389
	390	case IIO_CHAN_INFO_SCALE:
	391	index = stk3310_get_index(stk3310_scale_table,
	392	ARRAY_SIZE(stk3310_scale_table),
	393	val, val2);
	394	if (index < 0)
	395	return -EINVAL;
	396	mutex_lock(&data->lock);
	397	if (chan->type == IIO_LIGHT)
	398	ret = regmap_field_write(data->reg_als_gain, index);
	399	else
	400	ret = regmap_field_write(data->reg_ps_gain, index);
	401	if (ret < 0)
	402	dev_err(&data->client->dev,
5b958f11	403	"sensor configuration failed\n");
be9e6229 TB	404	mutex_unlock(&data->lock);
	405	return ret;
	406	}
	407
	408	return -EINVAL;
	409	}
	410
	411	static const struct iio_info stk3310_info = {
be9e6229 TB	412	.read_raw = stk3310_read_raw,
	413	.write_raw = stk3310_write_raw,
	414	.attrs = &stk3310_attribute_group,
3dd477ac TB	415	.read_event_value = stk3310_read_event,
	416	.write_event_value = stk3310_write_event,
	417	.read_event_config = stk3310_read_event_config,
	418	.write_event_config = stk3310_write_event_config,
be9e6229 TB	419	};
	420
	421	static int stk3310_set_state(struct stk3310_data *data, u8 state)
	422	{
	423	int ret;
	424	struct i2c_client *client = data->client;
	425
	426	/* 3-bit state; 0b100 is not supported. */
	427	if (state > 7 \|\| state == 4)
	428	return -EINVAL;
	429
	430	mutex_lock(&data->lock);
	431	ret = regmap_field_write(data->reg_state, state);
	432	if (ret < 0) {
	433	dev_err(&client->dev, "failed to change sensor state\n");
	434	} else if (state != STK3310_STATE_STANDBY) {
	435	/* Don't reset the 'enabled' flags if we're going in standby */
952c3aa3 HK	436	data->ps_enabled = !!(state & STK3310_STATE_EN_PS);
952c3aa3 HK	437	data->als_enabled = !!(state & STK3310_STATE_EN_ALS);
be9e6229 TB	438	}
	439	mutex_unlock(&data->lock);
	440
	441	return ret;
	442	}
	443
	444	static int stk3310_init(struct iio_dev *indio_dev)
	445	{
	446	int ret;
	447	int chipid;
	448	u8 state;
	449	struct stk3310_data *data = iio_priv(indio_dev);
	450	struct i2c_client *client = data->client;
	451
7c7a9eea HK	452	ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
	453	if (ret < 0)
	454	return ret;
	455
be9e6229 TB	456	if (chipid != STK3310_CHIP_ID_VAL &&
	457	chipid != STK3311_CHIP_ID_VAL) {
	458	dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
	459	return -ENODEV;
	460	}
	461
	462	state = STK3310_STATE_EN_ALS \| STK3310_STATE_EN_PS;
	463	ret = stk3310_set_state(data, state);
3dd477ac	464	if (ret < 0) {
be9e6229	465	dev_err(&client->dev, "failed to enable sensor");
3dd477ac TB	466	return ret;
	467	}
	468
	469	/* Enable PS interrupts */
	470	ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
	471	if (ret < 0)
	472	dev_err(&client->dev, "failed to enable interrupts!\n");
	473
	474	return ret;
	475	}
	476
be9e6229 TB	477	static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
	478	{
	479	switch (reg) {
	480	case STK3310_REG_ALS_DATA_MSB:
	481	case STK3310_REG_ALS_DATA_LSB:
	482	case STK3310_REG_PS_DATA_LSB:
	483	case STK3310_REG_PS_DATA_MSB:
3dd477ac	484	case STK3310_REG_FLAG:
be9e6229 TB	485	return true;
	486	default:
	487	return false;
	488	}
	489	}
	490
	491	static struct regmap_config stk3310_regmap_config = {
	492	.name = STK3310_REGMAP_NAME,
	493	.reg_bits = 8,
	494	.val_bits = 8,
	495	.max_register = STK3310_MAX_REG,
	496	.cache_type = REGCACHE_RBTREE,
	497	.volatile_reg = stk3310_is_volatile_reg,
	498	};
	499
	500	static int stk3310_regmap_init(struct stk3310_data *data)
	501	{
	502	struct regmap *regmap;
	503	struct i2c_client *client;
	504
	505	client = data->client;
	506	regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
	507	if (IS_ERR(regmap)) {
	508	dev_err(&client->dev, "regmap initialization failed.\n");
	509	return PTR_ERR(regmap);
	510	}
	511	data->regmap = regmap;
	512
	513	STK3310_REGFIELD(state);
	514	STK3310_REGFIELD(als_gain);
	515	STK3310_REGFIELD(ps_gain);
	516	STK3310_REGFIELD(als_it);
	517	STK3310_REGFIELD(ps_it);
3dd477ac TB	518	STK3310_REGFIELD(int_ps);
	519	STK3310_REGFIELD(flag_psint);
	520	STK3310_REGFIELD(flag_nf);
be9e6229 TB	521
	522	return 0;
	523	}
	524
3dd477ac TB	525	static irqreturn_t stk3310_irq_handler(int irq, void *private)
	526	{
	527	struct iio_dev *indio_dev = private;
	528	struct stk3310_data *data = iio_priv(indio_dev);
	529
bc2b7dab	530	data->timestamp = iio_get_time_ns(indio_dev);
3dd477ac TB	531
	532	return IRQ_WAKE_THREAD;
	533	}
	534
	535	static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
	536	{
	537	int ret;
	538	unsigned int dir;
	539	u64 event;
	540
	541	struct iio_dev *indio_dev = private;
	542	struct stk3310_data *data = iio_priv(indio_dev);
	543
	544	/* Read FLAG_NF to figure out what threshold has been met. */
	545	mutex_lock(&data->lock);
	546	ret = regmap_field_read(data->reg_flag_nf, &dir);
	547	if (ret < 0) {
	548	dev_err(&data->client->dev, "register read failed\n");
	549	mutex_unlock(&data->lock);
	550	return ret;
	551	}
	552	event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
	553	IIO_EV_TYPE_THRESH,
0f16fc8b TB	554	(dir ? IIO_EV_DIR_FALLING :
0f16fc8b TB	555	IIO_EV_DIR_RISING));
3dd477ac TB	556	iio_push_event(indio_dev, event, data->timestamp);
	557
	558	/* Reset the interrupt flag */
	559	ret = regmap_field_write(data->reg_flag_psint, 0);
	560	if (ret < 0)
	561	dev_err(&data->client->dev, "failed to reset interrupts\n");
	562	mutex_unlock(&data->lock);
	563
	564	return IRQ_HANDLED;
	565	}
	566
be9e6229 TB	567	static int stk3310_probe(struct i2c_client *client,
	568	const struct i2c_device_id *id)
	569	{
	570	int ret;
	571	struct iio_dev *indio_dev;
	572	struct stk3310_data *data;
	573
	574	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	575	if (!indio_dev) {
	576	dev_err(&client->dev, "iio allocation failed!\n");
	577	return -ENOMEM;
	578	}
	579
	580	data = iio_priv(indio_dev);
	581	data->client = client;
	582	i2c_set_clientdata(client, indio_dev);
	583	mutex_init(&data->lock);
	584
	585	ret = stk3310_regmap_init(data);
	586	if (ret < 0)
	587	return ret;
	588
	589	indio_dev->dev.parent = &client->dev;
	590	indio_dev->info = &stk3310_info;
	591	indio_dev->name = STK3310_DRIVER_NAME;
	592	indio_dev->modes = INDIO_DIRECT_MODE;
	593	indio_dev->channels = stk3310_channels;
	594	indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
	595
	596	ret = stk3310_init(indio_dev);
	597	if (ret < 0)
	598	return ret;
	599
6839c1b0	600	if (client->irq > 0) {
3dd477ac TB	601	ret = devm_request_threaded_irq(&client->dev, client->irq,
	602	stk3310_irq_handler,
	603	stk3310_irq_event_handler,
	604	IRQF_TRIGGER_FALLING \|
	605	IRQF_ONESHOT,
	606	STK3310_EVENT, indio_dev);
7c7a9eea	607	if (ret < 0) {
3dd477ac	608	dev_err(&client->dev, "request irq %d failed\n",
5b958f11	609	client->irq);
7c7a9eea HK	610	goto err_standby;
7c7a9eea HK	611	}
3dd477ac TB	612	}
3dd477ac TB	613
037e966f HK	614	ret = iio_device_register(indio_dev);
	615	if (ret < 0) {
	616	dev_err(&client->dev, "device_register failed\n");
7c7a9eea	617	goto err_standby;
037e966f HK	618	}
037e966f HK	619
7c7a9eea HK	620	return 0;
	621
	622	err_standby:
	623	stk3310_set_state(data, STK3310_STATE_STANDBY);
be9e6229 TB	624	return ret;
	625	}
	626
	627	static int stk3310_remove(struct i2c_client *client)
	628	{
	629	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	630
	631	iio_device_unregister(indio_dev);
	632	return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
	633	}
	634
	635	#ifdef CONFIG_PM_SLEEP
	636	static int stk3310_suspend(struct device *dev)
	637	{
	638	struct stk3310_data *data;
	639
	640	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	641
	642	return stk3310_set_state(data, STK3310_STATE_STANDBY);
	643	}
	644
	645	static int stk3310_resume(struct device *dev)
	646	{
952c3aa3	647	u8 state = 0;
be9e6229 TB	648	struct stk3310_data *data;
	649
	650	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	651	if (data->ps_enabled)
	652	state \|= STK3310_STATE_EN_PS;
	653	if (data->als_enabled)
	654	state \|= STK3310_STATE_EN_ALS;
	655
	656	return stk3310_set_state(data, state);
	657	}
	658
	659	static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);
	660
	661	#define STK3310_PM_OPS (&stk3310_pm_ops)
	662	#else
	663	#define STK3310_PM_OPS NULL
	664	#endif
	665
	666	static const struct i2c_device_id stk3310_i2c_id[] = {
	667	{"STK3310", 0},
	668	{"STK3311", 0},
	669	{}
	670	};
58e446fc	671	MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);
be9e6229 TB	672
	673	static const struct acpi_device_id stk3310_acpi_id[] = {
	674	{"STK3310", 0},
	675	{"STK3311", 0},
	676	{}
	677	};
	678
	679	MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
	680
	681	static struct i2c_driver stk3310_driver = {
	682	.driver = {
	683	.name = "stk3310",
	684	.pm = STK3310_PM_OPS,
	685	.acpi_match_table = ACPI_PTR(stk3310_acpi_id),
	686	},
	687	.probe = stk3310_probe,
	688	.remove = stk3310_remove,
	689	.id_table = stk3310_i2c_id,
	690	};
	691
	692	module_i2c_driver(stk3310_driver);
	693
	694	MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
	695	MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
	696	MODULE_LICENSE("GPL v2");