[deliverable/linux.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/gpio/consumer.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 = {
	.driver_module		= THIS_MODULE,
	.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();

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