[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			0x01
#define STK3310_STATE_EN_ALS			0x02
#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_GPIO				"stk3310_gpio"

#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;

	regmap_field_read(data->reg_ps_gain, &index);
	if (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;
	struct stk3310_data *data = iio_priv(indio_dev);

	regmap_field_read(data->reg_int_ps, &event_val);

	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;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (chan->type == IIO_LIGHT)
			reg = STK3310_REG_ALS_DATA_MSB;
		else if (chan->type == IIO_PROXIMITY)
			reg = STK3310_REG_PS_DATA_MSB;
		else
			return -EINVAL;
		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)
			regmap_field_read(data->reg_als_it, &index);
		else
			regmap_field_read(data->reg_ps_it, &index);
		*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)
			regmap_field_read(data->reg_als_gain, &index);
		else
			regmap_field_read(data->reg_ps_gain, &index);
		*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);

	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 & 0x01);
		data->als_enabled = !!(state & 0x02);
	}
	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;

	regmap_read(data->regmap, STK3310_REG_ID, &chipid);
	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 int stk3310_gpio_probe(struct i2c_client *client)
{
	struct device *dev;
	struct gpio_desc *gpio;
	int ret;

	if (!client)
		return -EINVAL;

	dev = &client->dev;

	/* gpio interrupt pin */
	gpio = devm_gpiod_get_index(dev, STK3310_GPIO, 0, GPIOD_IN);
	if (IS_ERR(gpio)) {
		dev_err(dev, "acpi gpio get index failed\n");
		return PTR_ERR(gpio);
	}

	ret = gpiod_to_irq(gpio);
	dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);

	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)
		client->irq = stk3310_gpio_probe(client);

	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);
	}

	ret = iio_device_register(indio_dev);
	if (ret < 0) {
		dev_err(&client->dev, "device_register failed\n");
		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)
{
	int 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
	38	#define STK3310_STATE_EN_PS 0x01
	39	#define STK3310_STATE_EN_ALS 0x02
	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 TB	49	#define STK3310_EVENT "stk3310_event"
3dd477ac TB	50	#define STK3310_GPIO "stk3310_gpio"
be9e6229 TB	51
	52	#define STK3310_SCALE_AVAILABLE "6.4 1.6 0.4 0.1"
	53
	54	#define STK3310_IT_AVAILABLE \
	55	"0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
	56	"0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
	57	"3.031040 6.062080"
	58
	59	#define STK3310_REGFIELD(name) \
	60	do { \
	61	data->reg_##name = \
	62	devm_regmap_field_alloc(&client->dev, regmap, \
	63	stk3310_reg_field_##name); \
	64	if (IS_ERR(data->reg_##name)) { \
	65	dev_err(&client->dev, "reg field alloc failed.\n"); \
	66	return PTR_ERR(data->reg_##name); \
	67	} \
	68	} while (0)
	69
	70	static const struct reg_field stk3310_reg_field_state =
	71	REG_FIELD(STK3310_REG_STATE, 0, 2);
	72	static const struct reg_field stk3310_reg_field_als_gain =
	73	REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
	74	static const struct reg_field stk3310_reg_field_ps_gain =
	75	REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
	76	static const struct reg_field stk3310_reg_field_als_it =
	77	REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
	78	static const struct reg_field stk3310_reg_field_ps_it =
	79	REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
3dd477ac TB	80	static const struct reg_field stk3310_reg_field_int_ps =
	81	REG_FIELD(STK3310_REG_INT, 0, 2);
	82	static const struct reg_field stk3310_reg_field_flag_psint =
	83	REG_FIELD(STK3310_REG_FLAG, 4, 4);
	84	static const struct reg_field stk3310_reg_field_flag_nf =
	85	REG_FIELD(STK3310_REG_FLAG, 0, 0);
0f16fc8b TB	86
0f16fc8b TB	87	/* Estimate maximum proximity values with regard to measurement scale. */
be9e6229	88	static const int stk3310_ps_max[4] = {
0f16fc8b TB	89	STK3310_PS_MAX_VAL / 640,
	90	STK3310_PS_MAX_VAL / 160,
	91	STK3310_PS_MAX_VAL / 40,
	92	STK3310_PS_MAX_VAL / 10
be9e6229 TB	93	};
	94
	95	static const int stk3310_scale_table[][2] = {
	96	{6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
	97	};
	98
	99	/* Integration time in seconds, microseconds */
	100	static const int stk3310_it_table[][2] = {
	101	{0, 185}, {0, 370}, {0, 741}, {0, 1480},
	102	{0, 2960}, {0, 5920}, {0, 11840}, {0, 23680},
	103	{0, 47360}, {0, 94720}, {0, 189440}, {0, 378880},
	104	{0, 757760}, {1, 515520}, {3, 31040}, {6, 62080},
	105	};
	106
	107	struct stk3310_data {
	108	struct i2c_client *client;
	109	struct mutex lock;
	110	bool als_enabled;
	111	bool ps_enabled;
3dd477ac	112	u64 timestamp;
be9e6229 TB	113	struct regmap *regmap;
	114	struct regmap_field *reg_state;
	115	struct regmap_field *reg_als_gain;
	116	struct regmap_field *reg_ps_gain;
	117	struct regmap_field *reg_als_it;
	118	struct regmap_field *reg_ps_it;
3dd477ac TB	119	struct regmap_field *reg_int_ps;
	120	struct regmap_field *reg_flag_psint;
	121	struct regmap_field *reg_flag_nf;
	122	};
	123
	124	static const struct iio_event_spec stk3310_events[] = {
	125	/* Proximity event */
	126	{
	127	.type = IIO_EV_TYPE_THRESH,
0f16fc8b	128	.dir = IIO_EV_DIR_RISING,
3dd477ac TB	129	.mask_separate = BIT(IIO_EV_INFO_VALUE) \|
	130	BIT(IIO_EV_INFO_ENABLE),
	131	},
	132	/* Out-of-proximity event */
	133	{
	134	.type = IIO_EV_TYPE_THRESH,
0f16fc8b	135	.dir = IIO_EV_DIR_FALLING,
3dd477ac TB	136	.mask_separate = BIT(IIO_EV_INFO_VALUE) \|
	137	BIT(IIO_EV_INFO_ENABLE),
	138	},
be9e6229 TB	139	};
	140
	141	static const struct iio_chan_spec stk3310_channels[] = {
	142	{
	143	.type = IIO_LIGHT,
	144	.info_mask_separate =
	145	BIT(IIO_CHAN_INFO_RAW) \|
	146	BIT(IIO_CHAN_INFO_SCALE) \|
	147	BIT(IIO_CHAN_INFO_INT_TIME),
	148	},
	149	{
	150	.type = IIO_PROXIMITY,
	151	.info_mask_separate =
	152	BIT(IIO_CHAN_INFO_RAW) \|
	153	BIT(IIO_CHAN_INFO_SCALE) \|
	154	BIT(IIO_CHAN_INFO_INT_TIME),
3dd477ac TB	155	.event_spec = stk3310_events,
3dd477ac TB	156	.num_event_specs = ARRAY_SIZE(stk3310_events),
be9e6229 TB	157	}
	158	};
	159
	160	static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
	161
	162	static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
	163
	164	static IIO_CONST_ATTR(in_illuminance_integration_time_available,
	165	STK3310_IT_AVAILABLE);
	166
	167	static IIO_CONST_ATTR(in_proximity_integration_time_available,
	168	STK3310_IT_AVAILABLE);
	169
	170	static struct attribute *stk3310_attributes[] = {
	171	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
	172	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
	173	&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
	174	&iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
	175	NULL,
	176	};
	177
	178	static const struct attribute_group stk3310_attribute_group = {
	179	.attrs = stk3310_attributes
	180	};
	181
	182	static int stk3310_get_index(const int table[][2], int table_size,
	183	int val, int val2)
	184	{
	185	int i;
	186
	187	for (i = 0; i < table_size; i++) {
	188	if (val == table[i][0] && val2 == table[i][1])
	189	return i;
	190	}
	191
	192	return -EINVAL;
	193	}
	194
3dd477ac TB	195	static int stk3310_read_event(struct iio_dev *indio_dev,
	196	const struct iio_chan_spec *chan,
	197	enum iio_event_type type,
	198	enum iio_event_direction dir,
	199	enum iio_event_info info,
	200	int val, int val2)
	201	{
	202	u8 reg;
423ad0c4	203	__be16 buf;
3dd477ac	204	int ret;
3dd477ac TB	205	struct stk3310_data *data = iio_priv(indio_dev);
	206
	207	if (info != IIO_EV_INFO_VALUE)
	208	return -EINVAL;
	209
0f16fc8b	210	/* Only proximity interrupts are implemented at the moment. */
3dd477ac	211	if (dir == IIO_EV_DIR_RISING)
3dd477ac	212	reg = STK3310_REG_THDH_PS;
0f16fc8b TB	213	else if (dir == IIO_EV_DIR_FALLING)
0f16fc8b TB	214	reg = STK3310_REG_THDL_PS;
3dd477ac TB	215	else
	216	return -EINVAL;
	217
	218	mutex_lock(&data->lock);
	219	ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
	220	mutex_unlock(&data->lock);
	221	if (ret < 0) {
	222	dev_err(&data->client->dev, "register read failed\n");
	223	return ret;
	224	}
423ad0c4	225	*val = be16_to_cpu(buf);
3dd477ac TB	226
	227	return IIO_VAL_INT;
	228	}
	229
	230	static int stk3310_write_event(struct iio_dev *indio_dev,
	231	const struct iio_chan_spec *chan,
	232	enum iio_event_type type,
	233	enum iio_event_direction dir,
	234	enum iio_event_info info,
	235	int val, int val2)
	236	{
	237	u8 reg;
423ad0c4	238	__be16 buf;
3dd477ac TB	239	int ret;
	240	unsigned int index;
	241	struct stk3310_data *data = iio_priv(indio_dev);
	242	struct i2c_client *client = data->client;
	243
	244	regmap_field_read(data->reg_ps_gain, &index);
	245	if (val > stk3310_ps_max[index])
	246	return -EINVAL;
	247
	248	if (dir == IIO_EV_DIR_RISING)
3dd477ac	249	reg = STK3310_REG_THDH_PS;
0f16fc8b TB	250	else if (dir == IIO_EV_DIR_FALLING)
0f16fc8b TB	251	reg = STK3310_REG_THDL_PS;
3dd477ac TB	252	else
	253	return -EINVAL;
	254
423ad0c4	255	buf = cpu_to_be16(val);
3dd477ac TB	256	ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
	257	if (ret < 0)
	258	dev_err(&client->dev, "failed to set PS threshold!\n");
	259
	260	return ret;
	261	}
	262
	263	static int stk3310_read_event_config(struct iio_dev *indio_dev,
	264	const struct iio_chan_spec *chan,
	265	enum iio_event_type type,
	266	enum iio_event_direction dir)
	267	{
	268	unsigned int event_val;
	269	struct stk3310_data *data = iio_priv(indio_dev);
	270
	271	regmap_field_read(data->reg_int_ps, &event_val);
	272
	273	return event_val;
	274	}
	275
	276	static int stk3310_write_event_config(struct iio_dev *indio_dev,
	277	const struct iio_chan_spec *chan,
	278	enum iio_event_type type,
	279	enum iio_event_direction dir,
	280	int state)
	281	{
	282	int ret;
	283	struct stk3310_data *data = iio_priv(indio_dev);
	284	struct i2c_client *client = data->client;
	285
	286	if (state < 0 \|\| state > 7)
	287	return -EINVAL;
	288
	289	/* Set INT_PS value */
	290	mutex_lock(&data->lock);
	291	ret = regmap_field_write(data->reg_int_ps, state);
	292	if (ret < 0)
	293	dev_err(&client->dev, "failed to set interrupt mode\n");
	294	mutex_unlock(&data->lock);
	295
	296	return ret;
	297	}
	298
be9e6229 TB	299	static int stk3310_read_raw(struct iio_dev *indio_dev,
	300	struct iio_chan_spec const *chan,
	301	int val, int val2, long mask)
	302	{
	303	u8 reg;
423ad0c4	304	__be16 buf;
be9e6229 TB	305	int ret;
	306	unsigned int index;
	307	struct stk3310_data *data = iio_priv(indio_dev);
	308	struct i2c_client *client = data->client;
	309
	310	switch (mask) {
	311	case IIO_CHAN_INFO_RAW:
	312	if (chan->type == IIO_LIGHT)
	313	reg = STK3310_REG_ALS_DATA_MSB;
	314	else if (chan->type == IIO_PROXIMITY)
	315	reg = STK3310_REG_PS_DATA_MSB;
	316	else
	317	return -EINVAL;
	318	mutex_lock(&data->lock);
	319	ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
	320	if (ret < 0) {
	321	dev_err(&client->dev, "register read failed\n");
	322	mutex_unlock(&data->lock);
	323	return ret;
	324	}
423ad0c4	325	*val = be16_to_cpu(buf);
be9e6229 TB	326	mutex_unlock(&data->lock);
	327	return IIO_VAL_INT;
	328	case IIO_CHAN_INFO_INT_TIME:
	329	if (chan->type == IIO_LIGHT)
	330	regmap_field_read(data->reg_als_it, &index);
	331	else
	332	regmap_field_read(data->reg_ps_it, &index);
	333	*val = stk3310_it_table[index][0];
	334	*val2 = stk3310_it_table[index][1];
	335	return IIO_VAL_INT_PLUS_MICRO;
	336	case IIO_CHAN_INFO_SCALE:
	337	if (chan->type == IIO_LIGHT)
	338	regmap_field_read(data->reg_als_gain, &index);
	339	else
	340	regmap_field_read(data->reg_ps_gain, &index);
	341	*val = stk3310_scale_table[index][0];
	342	*val2 = stk3310_scale_table[index][1];
	343	return IIO_VAL_INT_PLUS_MICRO;
	344	}
	345
	346	return -EINVAL;
	347	}
	348
	349	static int stk3310_write_raw(struct iio_dev *indio_dev,
	350	struct iio_chan_spec const *chan,
	351	int val, int val2, long mask)
	352	{
	353	int ret;
ed6e75c7	354	int index;
be9e6229 TB	355	struct stk3310_data *data = iio_priv(indio_dev);
	356
	357	switch (mask) {
	358	case IIO_CHAN_INFO_INT_TIME:
	359	index = stk3310_get_index(stk3310_it_table,
	360	ARRAY_SIZE(stk3310_it_table),
	361	val, val2);
	362	if (index < 0)
	363	return -EINVAL;
	364	mutex_lock(&data->lock);
	365	if (chan->type == IIO_LIGHT)
	366	ret = regmap_field_write(data->reg_als_it, index);
	367	else
	368	ret = regmap_field_write(data->reg_ps_it, index);
	369	if (ret < 0)
	370	dev_err(&data->client->dev,
	371	"sensor configuration failed\n");
	372	mutex_unlock(&data->lock);
	373	return ret;
	374
	375	case IIO_CHAN_INFO_SCALE:
	376	index = stk3310_get_index(stk3310_scale_table,
	377	ARRAY_SIZE(stk3310_scale_table),
	378	val, val2);
	379	if (index < 0)
	380	return -EINVAL;
	381	mutex_lock(&data->lock);
	382	if (chan->type == IIO_LIGHT)
	383	ret = regmap_field_write(data->reg_als_gain, index);
	384	else
	385	ret = regmap_field_write(data->reg_ps_gain, index);
	386	if (ret < 0)
	387	dev_err(&data->client->dev,
	388	"sensor configuration failed\n");
	389	mutex_unlock(&data->lock);
	390	return ret;
	391	}
	392
	393	return -EINVAL;
	394	}
	395
	396	static const struct iio_info stk3310_info = {
	397	.driver_module = THIS_MODULE,
	398	.read_raw = stk3310_read_raw,
	399	.write_raw = stk3310_write_raw,
	400	.attrs = &stk3310_attribute_group,
3dd477ac TB	401	.read_event_value = stk3310_read_event,
	402	.write_event_value = stk3310_write_event,
	403	.read_event_config = stk3310_read_event_config,
	404	.write_event_config = stk3310_write_event_config,
be9e6229 TB	405	};
	406
	407	static int stk3310_set_state(struct stk3310_data *data, u8 state)
	408	{
	409	int ret;
	410	struct i2c_client *client = data->client;
	411
	412	/* 3-bit state; 0b100 is not supported. */
	413	if (state > 7 \|\| state == 4)
	414	return -EINVAL;
	415
	416	mutex_lock(&data->lock);
	417	ret = regmap_field_write(data->reg_state, state);
	418	if (ret < 0) {
	419	dev_err(&client->dev, "failed to change sensor state\n");
	420	} else if (state != STK3310_STATE_STANDBY) {
	421	/* Don't reset the 'enabled' flags if we're going in standby */
	422	data->ps_enabled = !!(state & 0x01);
	423	data->als_enabled = !!(state & 0x02);
	424	}
	425	mutex_unlock(&data->lock);
	426
	427	return ret;
	428	}
	429
	430	static int stk3310_init(struct iio_dev *indio_dev)
	431	{
	432	int ret;
	433	int chipid;
	434	u8 state;
	435	struct stk3310_data *data = iio_priv(indio_dev);
	436	struct i2c_client *client = data->client;
	437
	438	regmap_read(data->regmap, STK3310_REG_ID, &chipid);
	439	if (chipid != STK3310_CHIP_ID_VAL &&
	440	chipid != STK3311_CHIP_ID_VAL) {
	441	dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
	442	return -ENODEV;
	443	}
	444
	445	state = STK3310_STATE_EN_ALS \| STK3310_STATE_EN_PS;
	446	ret = stk3310_set_state(data, state);
3dd477ac	447	if (ret < 0) {
be9e6229	448	dev_err(&client->dev, "failed to enable sensor");
3dd477ac TB	449	return ret;
	450	}
	451
	452	/* Enable PS interrupts */
	453	ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
	454	if (ret < 0)
	455	dev_err(&client->dev, "failed to enable interrupts!\n");
	456
	457	return ret;
	458	}
	459
	460	static int stk3310_gpio_probe(struct i2c_client *client)
	461	{
	462	struct device *dev;
	463	struct gpio_desc *gpio;
	464	int ret;
	465
	466	if (!client)
	467	return -EINVAL;
	468
	469	dev = &client->dev;
	470
	471	/* gpio interrupt pin */
7d4eb6f2	472	gpio = devm_gpiod_get_index(dev, STK3310_GPIO, 0, GPIOD_IN);
3dd477ac TB	473	if (IS_ERR(gpio)) {
	474	dev_err(dev, "acpi gpio get index failed\n");
	475	return PTR_ERR(gpio);
	476	}
	477
3dd477ac TB	478	ret = gpiod_to_irq(gpio);
3dd477ac TB	479	dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
be9e6229 TB	480
	481	return ret;
	482	}
	483
	484	static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
	485	{
	486	switch (reg) {
	487	case STK3310_REG_ALS_DATA_MSB:
	488	case STK3310_REG_ALS_DATA_LSB:
	489	case STK3310_REG_PS_DATA_LSB:
	490	case STK3310_REG_PS_DATA_MSB:
3dd477ac	491	case STK3310_REG_FLAG:
be9e6229 TB	492	return true;
	493	default:
	494	return false;
	495	}
	496	}
	497
	498	static struct regmap_config stk3310_regmap_config = {
	499	.name = STK3310_REGMAP_NAME,
	500	.reg_bits = 8,
	501	.val_bits = 8,
	502	.max_register = STK3310_MAX_REG,
	503	.cache_type = REGCACHE_RBTREE,
	504	.volatile_reg = stk3310_is_volatile_reg,
	505	};
	506
	507	static int stk3310_regmap_init(struct stk3310_data *data)
	508	{
	509	struct regmap *regmap;
	510	struct i2c_client *client;
	511
	512	client = data->client;
	513	regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
	514	if (IS_ERR(regmap)) {
	515	dev_err(&client->dev, "regmap initialization failed.\n");
	516	return PTR_ERR(regmap);
	517	}
	518	data->regmap = regmap;
	519
	520	STK3310_REGFIELD(state);
	521	STK3310_REGFIELD(als_gain);
	522	STK3310_REGFIELD(ps_gain);
	523	STK3310_REGFIELD(als_it);
	524	STK3310_REGFIELD(ps_it);
3dd477ac TB	525	STK3310_REGFIELD(int_ps);
	526	STK3310_REGFIELD(flag_psint);
	527	STK3310_REGFIELD(flag_nf);
be9e6229 TB	528
	529	return 0;
	530	}
	531
3dd477ac TB	532	static irqreturn_t stk3310_irq_handler(int irq, void *private)
	533	{
	534	struct iio_dev *indio_dev = private;
	535	struct stk3310_data *data = iio_priv(indio_dev);
	536
	537	data->timestamp = iio_get_time_ns();
	538
	539	return IRQ_WAKE_THREAD;
	540	}
	541
	542	static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
	543	{
	544	int ret;
	545	unsigned int dir;
	546	u64 event;
	547
	548	struct iio_dev *indio_dev = private;
	549	struct stk3310_data *data = iio_priv(indio_dev);
	550
	551	/* Read FLAG_NF to figure out what threshold has been met. */
	552	mutex_lock(&data->lock);
	553	ret = regmap_field_read(data->reg_flag_nf, &dir);
	554	if (ret < 0) {
	555	dev_err(&data->client->dev, "register read failed\n");
	556	mutex_unlock(&data->lock);
	557	return ret;
	558	}
	559	event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
	560	IIO_EV_TYPE_THRESH,
0f16fc8b TB	561	(dir ? IIO_EV_DIR_FALLING :
0f16fc8b TB	562	IIO_EV_DIR_RISING));
3dd477ac TB	563	iio_push_event(indio_dev, event, data->timestamp);
	564
	565	/* Reset the interrupt flag */
	566	ret = regmap_field_write(data->reg_flag_psint, 0);
	567	if (ret < 0)
	568	dev_err(&data->client->dev, "failed to reset interrupts\n");
	569	mutex_unlock(&data->lock);
	570
	571	return IRQ_HANDLED;
	572	}
	573
be9e6229 TB	574	static int stk3310_probe(struct i2c_client *client,
	575	const struct i2c_device_id *id)
	576	{
	577	int ret;
	578	struct iio_dev *indio_dev;
	579	struct stk3310_data *data;
	580
	581	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	582	if (!indio_dev) {
	583	dev_err(&client->dev, "iio allocation failed!\n");
	584	return -ENOMEM;
	585	}
	586
	587	data = iio_priv(indio_dev);
	588	data->client = client;
	589	i2c_set_clientdata(client, indio_dev);
	590	mutex_init(&data->lock);
	591
	592	ret = stk3310_regmap_init(data);
	593	if (ret < 0)
	594	return ret;
	595
	596	indio_dev->dev.parent = &client->dev;
	597	indio_dev->info = &stk3310_info;
	598	indio_dev->name = STK3310_DRIVER_NAME;
	599	indio_dev->modes = INDIO_DIRECT_MODE;
	600	indio_dev->channels = stk3310_channels;
	601	indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
	602
	603	ret = stk3310_init(indio_dev);
	604	if (ret < 0)
	605	return ret;
	606
037e966f	607	if (client->irq < 0)
3dd477ac TB	608	client->irq = stk3310_gpio_probe(client);
	609
	610	if (client->irq >= 0) {
	611	ret = devm_request_threaded_irq(&client->dev, client->irq,
	612	stk3310_irq_handler,
	613	stk3310_irq_event_handler,
	614	IRQF_TRIGGER_FALLING \|
	615	IRQF_ONESHOT,
	616	STK3310_EVENT, indio_dev);
	617	if (ret < 0)
	618	dev_err(&client->dev, "request irq %d failed\n",
	619	client->irq);
	620	}
	621
037e966f HK	622	ret = iio_device_register(indio_dev);
	623	if (ret < 0) {
	624	dev_err(&client->dev, "device_register failed\n");
	625	stk3310_set_state(data, STK3310_STATE_STANDBY);
	626	}
	627
be9e6229 TB	628	return ret;
	629	}
	630
	631	static int stk3310_remove(struct i2c_client *client)
	632	{
	633	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	634
	635	iio_device_unregister(indio_dev);
	636	return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
	637	}
	638
	639	#ifdef CONFIG_PM_SLEEP
	640	static int stk3310_suspend(struct device *dev)
	641	{
	642	struct stk3310_data *data;
	643
	644	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	645
	646	return stk3310_set_state(data, STK3310_STATE_STANDBY);
	647	}
	648
	649	static int stk3310_resume(struct device *dev)
	650	{
	651	int state = 0;
	652	struct stk3310_data *data;
	653
	654	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	655	if (data->ps_enabled)
	656	state \|= STK3310_STATE_EN_PS;
	657	if (data->als_enabled)
	658	state \|= STK3310_STATE_EN_ALS;
	659
	660	return stk3310_set_state(data, state);
	661	}
	662
	663	static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);
	664
	665	#define STK3310_PM_OPS (&stk3310_pm_ops)
	666	#else
	667	#define STK3310_PM_OPS NULL
	668	#endif
	669
	670	static const struct i2c_device_id stk3310_i2c_id[] = {
	671	{"STK3310", 0},
	672	{"STK3311", 0},
	673	{}
	674	};
58e446fc	675	MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);
be9e6229 TB	676
	677	static const struct acpi_device_id stk3310_acpi_id[] = {
	678	{"STK3310", 0},
	679	{"STK3311", 0},
	680	{}
	681	};
	682
	683	MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
	684
	685	static struct i2c_driver stk3310_driver = {
	686	.driver = {
	687	.name = "stk3310",
	688	.pm = STK3310_PM_OPS,
	689	.acpi_match_table = ACPI_PTR(stk3310_acpi_id),
	690	},
	691	.probe = stk3310_probe,
	692	.remove = stk3310_remove,
	693	.id_table = stk3310_i2c_id,
	694	};
	695
	696	module_i2c_driver(stk3310_driver);
	697
	698	MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
	699	MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
	700	MODULE_LICENSE("GPL v2");