drivers/iio/light/pa12203001.c - linux - Git at Google

 /*
  * Copyright (c) 2015 Intel Corporation
  *
  * Driver for TXC PA12203001 Proximity and Ambient Light Sensor.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  * To do: Interrupt support.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/acpi.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/mutex.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>

 #define PA12203001_DRIVER_NAME	"pa12203001"

 #define PA12203001_REG_CFG0		0x00
 #define PA12203001_REG_CFG1		0x01
 #define PA12203001_REG_CFG2		0x02
 #define PA12203001_REG_CFG3		0x03

 #define PA12203001_REG_ADL		0x0b
 #define PA12203001_REG_PDH		0x0e

 #define PA12203001_REG_POFS		0x10
 #define PA12203001_REG_PSET		0x11

 #define PA12203001_ALS_EN_MASK		BIT(0)
 #define PA12203001_PX_EN_MASK		BIT(1)
 #define PA12203001_PX_NORMAL_MODE_MASK		GENMASK(7, 6)
 #define PA12203001_AFSR_MASK		GENMASK(5, 4)
 #define PA12203001_AFSR_SHIFT		4

 #define PA12203001_PSCAN			0x03

 /* als range 31000, ps, als disabled */
 #define PA12203001_REG_CFG0_DEFAULT		0x30

 /* led current: 100 mA */
 #define PA12203001_REG_CFG1_DEFAULT		0x20

 /* ps mode: normal, interrupts not active */
 #define PA12203001_REG_CFG2_DEFAULT		0xcc

 #define PA12203001_REG_CFG3_DEFAULT		0x00

 #define PA12203001_SLEEP_DELAY_MS		3000

 #define PA12203001_CHIP_ENABLE		0xff
 #define PA12203001_CHIP_DISABLE		0x00

 /* available scales: corresponding to [500, 4000, 7000, 31000]  lux */
 static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029};

 struct pa12203001_data {
 	struct i2c_client *client;

 	/* protect device states */
 	struct mutex lock;

 	bool als_enabled;
 	bool px_enabled;
 	bool als_needs_enable;
 	bool px_needs_enable;

 	struct regmap *map;
 };

 static const struct {
 	u8 reg;
 	u8 val;
 } regvals[] = {
 	{PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT},
 	{PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT},
 	{PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT},
 	{PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT},
 	{PA12203001_REG_PSET, PA12203001_PSCAN},
 };

 static IIO_CONST_ATTR(in_illuminance_scale_available,
 		      "0.007629 0.061036 0.106813 0.473029");

 static struct attribute *pa12203001_attrs[] = {
 	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
 	NULL
 };

 static const struct attribute_group pa12203001_attr_group = {
 	.attrs = pa12203001_attrs,
 };

 static const struct iio_chan_spec pa12203001_channels[] = {
 	{
 		.type = IIO_LIGHT,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 				      BIT(IIO_CHAN_INFO_SCALE),
 	},
 	{
 		.type = IIO_PROXIMITY,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 	}
 };

 static const struct regmap_range pa12203001_volatile_regs_ranges[] = {
 	regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1),
 	regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH),
 };

 static const struct regmap_access_table pa12203001_volatile_regs = {
 	.yes_ranges = pa12203001_volatile_regs_ranges,
 	.n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges),
 };

 static const struct regmap_config pa12203001_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = PA12203001_REG_PSET,
 	.cache_type = REGCACHE_RBTREE,
 	.volatile_table = &pa12203001_volatile_regs,
 };

 static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable)
 {
 	int ret;

 	ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
 				 PA12203001_ALS_EN_MASK, enable);
 	if (ret < 0)
 		return ret;

 	data->als_enabled = !!enable;

 	return 0;
 }

 static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable)
 {
 	int ret;

 	ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
 				 PA12203001_PX_EN_MASK, enable);
 	if (ret < 0)
 		return ret;

 	data->px_enabled = !!enable;

 	return 0;
 }

 static int pa12203001_set_power_state(struct pa12203001_data *data, bool on,
 				      u8 mask)
 {
 #ifdef CONFIG_PM
 	int ret;

 	if (on && (mask & PA12203001_ALS_EN_MASK)) {
 		mutex_lock(&data->lock);
 		if (data->px_enabled) {
 			ret = pa12203001_als_enable(data,
 						    PA12203001_ALS_EN_MASK);
 			if (ret < 0)
 				goto err;
 		} else {
 			data->als_needs_enable = true;
 		}
 		mutex_unlock(&data->lock);
 	}

 	if (on && (mask & PA12203001_PX_EN_MASK)) {
 		mutex_lock(&data->lock);
 		if (data->als_enabled) {
 			ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
 			if (ret < 0)
 				goto err;
 		} else {
 			data->px_needs_enable = true;
 		}
 		mutex_unlock(&data->lock);
 	}

 	if (on) {
 		ret = pm_runtime_get_sync(&data->client->dev);
 		if (ret < 0)
 			pm_runtime_put_noidle(&data->client->dev);

 	} else {
 		pm_runtime_mark_last_busy(&data->client->dev);
 		ret = pm_runtime_put_autosuspend(&data->client->dev);
 	}

 	return ret;

 err:
 	mutex_unlock(&data->lock);
 	return ret;

 #endif
 	return 0;
 }

 static int pa12203001_read_raw(struct iio_dev *indio_dev,
 			       struct iio_chan_spec const *chan, int *val,
 			       int *val2, long mask)
 {
 	struct pa12203001_data *data = iio_priv(indio_dev);
 	int ret;
 	u8 dev_mask;
 	unsigned int reg_byte;
 	__le16 reg_word;

 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		switch (chan->type) {
 		case IIO_LIGHT:
 			dev_mask = PA12203001_ALS_EN_MASK;
 			ret = pa12203001_set_power_state(data, true, dev_mask);
 			if (ret < 0)
 				return ret;
 			/*
 			 * ALS ADC value is stored in registers
 			 * PA12203001_REG_ADL and in PA12203001_REG_ADL + 1.
 			 */
 			ret = regmap_bulk_read(data->map, PA12203001_REG_ADL,
 					       &reg_word, 2);
 			if (ret < 0)
 				goto reg_err;

 			*val = le16_to_cpu(reg_word);
 			ret = pa12203001_set_power_state(data, false, dev_mask);
 			if (ret < 0)
 				return ret;
 			break;
 		case IIO_PROXIMITY:
 			dev_mask = PA12203001_PX_EN_MASK;
 			ret = pa12203001_set_power_state(data, true, dev_mask);
 			if (ret < 0)
 				return ret;
 			ret = regmap_read(data->map, PA12203001_REG_PDH,
 					  &reg_byte);
 			if (ret < 0)
 				goto reg_err;

 			*val = reg_byte;
 			ret = pa12203001_set_power_state(data, false, dev_mask);
 			if (ret < 0)
 				return ret;
 			break;
 		default:
 			return -EINVAL;
 		}
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
 		if (ret < 0)
 			return ret;
 		*val = 0;
 		reg_byte = (reg_byte & PA12203001_AFSR_MASK);
 		*val2 = pa12203001_scales[reg_byte >> 4];
 		return IIO_VAL_INT_PLUS_MICRO;
 	default:
 		return -EINVAL;
 	}

 reg_err:
 	pa12203001_set_power_state(data, false, dev_mask);
 	return ret;
 }

 static int pa12203001_write_raw(struct iio_dev *indio_dev,
 				struct iio_chan_spec const *chan, int val,
 				int val2, long mask)
 {
 	struct pa12203001_data *data = iio_priv(indio_dev);
 	int i, ret, new_val;
 	unsigned int reg_byte;

 	switch (mask) {
 	case IIO_CHAN_INFO_SCALE:
 		ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
 		if (val != 0 || ret < 0)
 			return -EINVAL;
 		for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {
 			if (val2 == pa12203001_scales[i]) {
 				new_val = i << PA12203001_AFSR_SHIFT;
 				return regmap_update_bits(data->map,
 							  PA12203001_REG_CFG0,
 							  PA12203001_AFSR_MASK,
 							  new_val);
 			}
 		}
 		break;
 	default:
 		break;
 	}

 	return -EINVAL;
 }

 static const struct iio_info pa12203001_info = {
 	.driver_module	= THIS_MODULE,
 	.read_raw = pa12203001_read_raw,
 	.write_raw = pa12203001_write_raw,
 	.attrs = &pa12203001_attr_group,
 };

 static int pa12203001_init(struct iio_dev *indio_dev)
 {
 	struct pa12203001_data *data = iio_priv(indio_dev);
 	int i, ret;

 	for (i = 0; i < ARRAY_SIZE(regvals); i++) {
 		ret = regmap_write(data->map, regvals[i].reg, regvals[i].val);
 		if (ret < 0)
 			return ret;
 	}

 	return 0;
 }

 static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state)
 {
 	struct pa12203001_data *data = iio_priv(indio_dev);
 	int ret;

 	mutex_lock(&data->lock);
 	ret = pa12203001_als_enable(data, state);
 	if (ret < 0)
 		goto out;

 	ret = pa12203001_px_enable(data, state);

 out:
 	mutex_unlock(&data->lock);
 	return ret;
 }

 static int pa12203001_probe(struct i2c_client *client,
 			    const struct i2c_device_id *id)
 {
 	struct pa12203001_data *data;
 	struct iio_dev *indio_dev;
 	int ret;

 	indio_dev = devm_iio_device_alloc(&client->dev,
 					  sizeof(struct pa12203001_data));
 	if (!indio_dev)
 		return -ENOMEM;

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

 	data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config);
 	if (IS_ERR(data->map))
 		return PTR_ERR(data->map);

 	mutex_init(&data->lock);

 	indio_dev->dev.parent = &client->dev;
 	indio_dev->info = &pa12203001_info;
 	indio_dev->name = PA12203001_DRIVER_NAME;
 	indio_dev->channels = pa12203001_channels;
 	indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels);
 	indio_dev->modes = INDIO_DIRECT_MODE;

 	ret = pa12203001_init(indio_dev);
 	if (ret < 0)
 		return ret;

 	ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
 	if (ret < 0)
 		return ret;

 	ret = pm_runtime_set_active(&client->dev);
 	if (ret < 0) {
 		pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
 		return ret;
 	}

 	pm_runtime_enable(&client->dev);
 	pm_runtime_set_autosuspend_delay(&client->dev,
 					 PA12203001_SLEEP_DELAY_MS);
 	pm_runtime_use_autosuspend(&client->dev);

 	return iio_device_register(indio_dev);
 }

 static int pa12203001_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);

 	iio_device_unregister(indio_dev);

 	pm_runtime_disable(&client->dev);
 	pm_runtime_set_suspended(&client->dev);

 	return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
 }

 #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
 static int pa12203001_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));

 	return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
 }
 #endif

 #ifdef CONFIG_PM_SLEEP
 static int pa12203001_resume(struct device *dev)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));

 	return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
 }
 #endif

 #ifdef CONFIG_PM
 static int pa12203001_runtime_resume(struct device *dev)
 {
 	struct pa12203001_data *data;

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

 	mutex_lock(&data->lock);
 	if (data->als_needs_enable) {
 		pa12203001_als_enable(data, PA12203001_ALS_EN_MASK);
 		data->als_needs_enable = false;
 	}
 	if (data->px_needs_enable) {
 		pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
 		data->px_needs_enable = false;
 	}
 	mutex_unlock(&data->lock);

 	return 0;
 }
 #endif

 static const struct dev_pm_ops pa12203001_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume)
 	SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL)
 };

 static const struct acpi_device_id pa12203001_acpi_match[] = {
 	{ "TXCPA122", 0},
 	{}
 };

 MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match);

 static const struct i2c_device_id pa12203001_id[] = {
 		{"txcpa122", 0},
 		{}
 };

 MODULE_DEVICE_TABLE(i2c, pa12203001_id);

 static struct i2c_driver pa12203001_driver = {
 	.driver = {
 		.name = PA12203001_DRIVER_NAME,
 		.pm = &pa12203001_pm_ops,
 		.acpi_match_table = ACPI_PTR(pa12203001_acpi_match),
 	},
 	.probe = pa12203001_probe,
 	.remove = pa12203001_remove,
 	.id_table = pa12203001_id,

 };
 module_i2c_driver(pa12203001_driver);

 MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
 MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (c) 2015 Intel Corporation
	*
	* Driver for TXC PA12203001 Proximity and Ambient Light Sensor.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published by
	* the Free Software Foundation.
	* To do: Interrupt support.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/acpi.h>
	#include <linux/delay.h>
	#include <linux/i2c.h>
	#include <linux/iio/iio.h>
	#include <linux/iio/sysfs.h>
	#include <linux/mutex.h>
	#include <linux/pm.h>
	#include <linux/pm_runtime.h>
	#include <linux/regmap.h>

	#define PA12203001_DRIVER_NAME "pa12203001"

	#define PA12203001_REG_CFG0 0x00
	#define PA12203001_REG_CFG1 0x01
	#define PA12203001_REG_CFG2 0x02
	#define PA12203001_REG_CFG3 0x03

	#define PA12203001_REG_ADL 0x0b
	#define PA12203001_REG_PDH 0x0e

	#define PA12203001_REG_POFS 0x10
	#define PA12203001_REG_PSET 0x11

	#define PA12203001_ALS_EN_MASK BIT(0)
	#define PA12203001_PX_EN_MASK BIT(1)
	#define PA12203001_PX_NORMAL_MODE_MASK GENMASK(7, 6)
	#define PA12203001_AFSR_MASK GENMASK(5, 4)
	#define PA12203001_AFSR_SHIFT 4

	#define PA12203001_PSCAN 0x03

	/* als range 31000, ps, als disabled */
	#define PA12203001_REG_CFG0_DEFAULT 0x30

	/* led current: 100 mA */
	#define PA12203001_REG_CFG1_DEFAULT 0x20

	/* ps mode: normal, interrupts not active */
	#define PA12203001_REG_CFG2_DEFAULT 0xcc

	#define PA12203001_REG_CFG3_DEFAULT 0x00

	#define PA12203001_SLEEP_DELAY_MS 3000

	#define PA12203001_CHIP_ENABLE 0xff
	#define PA12203001_CHIP_DISABLE 0x00

	/* available scales: corresponding to [500, 4000, 7000, 31000] lux */
	static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029};

	struct pa12203001_data {
	struct i2c_client *client;

	/* protect device states */
	struct mutex lock;

	bool als_enabled;
	bool px_enabled;
	bool als_needs_enable;
	bool px_needs_enable;

	struct regmap *map;
	};

	static const struct {
	u8 reg;
	u8 val;
	} regvals[] = {
	{PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT},
	{PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT},
	{PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT},
	{PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT},
	{PA12203001_REG_PSET, PA12203001_PSCAN},
	};

	static IIO_CONST_ATTR(in_illuminance_scale_available,
	"0.007629 0.061036 0.106813 0.473029");

	static struct attribute *pa12203001_attrs[] = {
	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
	NULL
	};

	static const struct attribute_group pa12203001_attr_group = {
	.attrs = pa12203001_attrs,
	};

	static const struct iio_chan_spec pa12203001_channels[] = {
	{
	.type = IIO_LIGHT,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
	BIT(IIO_CHAN_INFO_SCALE),
	},
	{
	.type = IIO_PROXIMITY,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	}
	};

	static const struct regmap_range pa12203001_volatile_regs_ranges[] = {
	regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1),
	regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH),
	};

	static const struct regmap_access_table pa12203001_volatile_regs = {
	.yes_ranges = pa12203001_volatile_regs_ranges,
	.n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges),
	};

	static const struct regmap_config pa12203001_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = PA12203001_REG_PSET,
	.cache_type = REGCACHE_RBTREE,
	.volatile_table = &pa12203001_volatile_regs,
	};

	static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable)
	{
	int ret;

	ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
	PA12203001_ALS_EN_MASK, enable);
	if (ret < 0)
	return ret;

	data->als_enabled = !!enable;

	return 0;
	}

	static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable)
	{
	int ret;

	ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
	PA12203001_PX_EN_MASK, enable);
	if (ret < 0)
	return ret;

	data->px_enabled = !!enable;

	return 0;
	}

	static int pa12203001_set_power_state(struct pa12203001_data *data, bool on,
	u8 mask)
	{
	#ifdef CONFIG_PM
	int ret;

	if (on && (mask & PA12203001_ALS_EN_MASK)) {
	mutex_lock(&data->lock);
	if (data->px_enabled) {
	ret = pa12203001_als_enable(data,
	PA12203001_ALS_EN_MASK);
	if (ret < 0)
	goto err;
	} else {
	data->als_needs_enable = true;
	}
	mutex_unlock(&data->lock);
	}

	if (on && (mask & PA12203001_PX_EN_MASK)) {
	mutex_lock(&data->lock);
	if (data->als_enabled) {
	ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
	if (ret < 0)
	goto err;
	} else {
	data->px_needs_enable = true;
	}
	mutex_unlock(&data->lock);
	}

	if (on) {
	ret = pm_runtime_get_sync(&data->client->dev);
	if (ret < 0)
	pm_runtime_put_noidle(&data->client->dev);

	} else {
	pm_runtime_mark_last_busy(&data->client->dev);
	ret = pm_runtime_put_autosuspend(&data->client->dev);
	}

	return ret;

	err:
	mutex_unlock(&data->lock);
	return ret;

	#endif
	return 0;
	}

	static int pa12203001_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const chan, int val,
	int *val2, long mask)
	{
	struct pa12203001_data *data = iio_priv(indio_dev);
	int ret;
	u8 dev_mask;
	unsigned int reg_byte;
	__le16 reg_word;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	switch (chan->type) {
	case IIO_LIGHT:
	dev_mask = PA12203001_ALS_EN_MASK;
	ret = pa12203001_set_power_state(data, true, dev_mask);
	if (ret < 0)
	return ret;
	/*
	* ALS ADC value is stored in registers
	* PA12203001_REG_ADL and in PA12203001_REG_ADL + 1.
	*/
	ret = regmap_bulk_read(data->map, PA12203001_REG_ADL,
	&reg_word, 2);
	if (ret < 0)
	goto reg_err;

	*val = le16_to_cpu(reg_word);
	ret = pa12203001_set_power_state(data, false, dev_mask);
	if (ret < 0)
	return ret;
	break;
	case IIO_PROXIMITY:
	dev_mask = PA12203001_PX_EN_MASK;
	ret = pa12203001_set_power_state(data, true, dev_mask);
	if (ret < 0)
	return ret;
	ret = regmap_read(data->map, PA12203001_REG_PDH,
	&reg_byte);
	if (ret < 0)
	goto reg_err;

	*val = reg_byte;
	ret = pa12203001_set_power_state(data, false, dev_mask);
	if (ret < 0)
	return ret;
	break;
	default:
	return -EINVAL;
	}
	return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
	ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
	if (ret < 0)
	return ret;
	*val = 0;
	reg_byte = (reg_byte & PA12203001_AFSR_MASK);
	*val2 = pa12203001_scales[reg_byte >> 4];
	return IIO_VAL_INT_PLUS_MICRO;
	default:
	return -EINVAL;
	}

	reg_err:
	pa12203001_set_power_state(data, false, dev_mask);
	return ret;
	}

	static int pa12203001_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan, int val,
	int val2, long mask)
	{
	struct pa12203001_data *data = iio_priv(indio_dev);
	int i, ret, new_val;
	unsigned int reg_byte;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
	ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
	if (val != 0 \|\| ret < 0)
	return -EINVAL;
	for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {
	if (val2 == pa12203001_scales[i]) {
	new_val = i << PA12203001_AFSR_SHIFT;
	return regmap_update_bits(data->map,
	PA12203001_REG_CFG0,
	PA12203001_AFSR_MASK,
	new_val);
	}
	}
	break;
	default:
	break;
	}

	return -EINVAL;
	}

	static const struct iio_info pa12203001_info = {
	.driver_module = THIS_MODULE,
	.read_raw = pa12203001_read_raw,
	.write_raw = pa12203001_write_raw,
	.attrs = &pa12203001_attr_group,
	};

	static int pa12203001_init(struct iio_dev *indio_dev)
	{
	struct pa12203001_data *data = iio_priv(indio_dev);
	int i, ret;

	for (i = 0; i < ARRAY_SIZE(regvals); i++) {
	ret = regmap_write(data->map, regvals[i].reg, regvals[i].val);
	if (ret < 0)
	return ret;
	}

	return 0;
	}

	static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state)
	{
	struct pa12203001_data *data = iio_priv(indio_dev);
	int ret;

	mutex_lock(&data->lock);
	ret = pa12203001_als_enable(data, state);
	if (ret < 0)
	goto out;

	ret = pa12203001_px_enable(data, state);

	out:
	mutex_unlock(&data->lock);
	return ret;
	}

	static int pa12203001_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct pa12203001_data *data;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev,
	sizeof(struct pa12203001_data));
	if (!indio_dev)
	return -ENOMEM;

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

	data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config);
	if (IS_ERR(data->map))
	return PTR_ERR(data->map);

	mutex_init(&data->lock);

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &pa12203001_info;
	indio_dev->name = PA12203001_DRIVER_NAME;
	indio_dev->channels = pa12203001_channels;
	indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = pa12203001_init(indio_dev);
	if (ret < 0)
	return ret;

	ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
	if (ret < 0)
	return ret;

	ret = pm_runtime_set_active(&client->dev);
	if (ret < 0) {
	pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
	return ret;
	}

	pm_runtime_enable(&client->dev);
	pm_runtime_set_autosuspend_delay(&client->dev,
	PA12203001_SLEEP_DELAY_MS);
	pm_runtime_use_autosuspend(&client->dev);

	return iio_device_register(indio_dev);
	}

	static int pa12203001_remove(struct i2c_client *client)
	{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);

	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);

	return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
	}

	#if defined(CONFIG_PM_SLEEP) \|\| defined(CONFIG_PM)
	static int pa12203001_suspend(struct device *dev)
	{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));

	return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
	}
	#endif

	#ifdef CONFIG_PM_SLEEP
	static int pa12203001_resume(struct device *dev)
	{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));

	return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
	}
	#endif

	#ifdef CONFIG_PM
	static int pa12203001_runtime_resume(struct device *dev)
	{
	struct pa12203001_data *data;

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

	mutex_lock(&data->lock);
	if (data->als_needs_enable) {
	pa12203001_als_enable(data, PA12203001_ALS_EN_MASK);
	data->als_needs_enable = false;
	}
	if (data->px_needs_enable) {
	pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
	data->px_needs_enable = false;
	}
	mutex_unlock(&data->lock);

	return 0;
	}
	#endif

	static const struct dev_pm_ops pa12203001_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume)
	SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL)
	};

	static const struct acpi_device_id pa12203001_acpi_match[] = {
	{ "TXCPA122", 0},
	{}
	};

	MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match);

	static const struct i2c_device_id pa12203001_id[] = {
	{"txcpa122", 0},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, pa12203001_id);

	static struct i2c_driver pa12203001_driver = {
	.driver = {
	.name = PA12203001_DRIVER_NAME,
	.pm = &pa12203001_pm_ops,
	.acpi_match_table = ACPI_PTR(pa12203001_acpi_match),
	},
	.probe = pa12203001_probe,
	.remove = pa12203001_remove,
	.id_table = pa12203001_id,

	};
	module_i2c_driver(pa12203001_driver);

	MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
	MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");
	MODULE_LICENSE("GPL v2");