[linux-2.6-block.git] / drivers / leds / leds-lm3642.c

/*
* Simple driver for Texas Instruments LM3642 LED Flash driver chip
* Copyright (C) 2012 Texas Instruments
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/regmap.h>
#include <linux/platform_data/leds-lm3642.h>

#define	REG_FILT_TIME			(0x0)
#define	REG_IVFM_MODE			(0x1)
#define	REG_TORCH_TIME			(0x6)
#define	REG_FLASH			(0x8)
#define	REG_I_CTRL			(0x9)
#define	REG_ENABLE			(0xA)
#define	REG_FLAG			(0xB)
#define	REG_MAX				(0xB)

#define	UVLO_EN_SHIFT			(7)
#define	IVM_D_TH_SHIFT			(2)
#define	TORCH_RAMP_UP_TIME_SHIFT	(3)
#define	TORCH_RAMP_DN_TIME_SHIFT	(0)
#define	INDUCTOR_I_LIMIT_SHIFT		(6)
#define	FLASH_RAMP_TIME_SHIFT		(3)
#define	FLASH_TOUT_TIME_SHIFT		(0)
#define	TORCH_I_SHIFT			(4)
#define	FLASH_I_SHIFT			(0)
#define	IVFM_SHIFT			(7)
#define	TX_PIN_EN_SHIFT			(6)
#define	STROBE_PIN_EN_SHIFT		(5)
#define	TORCH_PIN_EN_SHIFT		(4)
#define	MODE_BITS_SHIFT			(0)

#define	UVLO_EN_MASK			(0x1)
#define	IVM_D_TH_MASK			(0x7)
#define	TORCH_RAMP_UP_TIME_MASK		(0x7)
#define	TORCH_RAMP_DN_TIME_MASK		(0x7)
#define	INDUCTOR_I_LIMIT_MASK		(0x1)
#define	FLASH_RAMP_TIME_MASK		(0x7)
#define	FLASH_TOUT_TIME_MASK		(0x7)
#define	TORCH_I_MASK			(0x7)
#define	FLASH_I_MASK			(0xF)
#define	IVFM_MASK			(0x1)
#define	TX_PIN_EN_MASK			(0x1)
#define	STROBE_PIN_EN_MASK		(0x1)
#define	TORCH_PIN_EN_MASK		(0x1)
#define	MODE_BITS_MASK			(0x73)
#define EX_PIN_CONTROL_MASK		(0x71)
#define EX_PIN_ENABLE_MASK		(0x70)

enum lm3642_mode {
	MODES_STASNDBY = 0,
	MODES_INDIC,
	MODES_TORCH,
	MODES_FLASH
};

struct lm3642_chip_data {
	struct device *dev;

	struct led_classdev cdev_flash;
	struct led_classdev cdev_torch;
	struct led_classdev cdev_indicator;

	u8 br_flash;
	u8 br_torch;
	u8 br_indicator;

	enum lm3642_torch_pin_enable torch_pin;
	enum lm3642_strobe_pin_enable strobe_pin;
	enum lm3642_tx_pin_enable tx_pin;

	struct lm3642_platform_data *pdata;
	struct regmap *regmap;
	struct mutex lock;

	unsigned int last_flag;
};

/* chip initialize */
static int lm3642_chip_init(struct lm3642_chip_data *chip)
{
	int ret;
	struct lm3642_platform_data *pdata = chip->pdata;

	/* set enable register */
	ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
				 pdata->tx_pin);
	if (ret < 0)
		dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
	return ret;
}

/* chip control */
static int lm3642_control(struct lm3642_chip_data *chip,
			  u8 brightness, enum lm3642_mode opmode)
{
	int ret;

	ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
		goto out;
	}

	if (chip->last_flag)
		dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);

	/* brightness 0 means off-state */
	if (!brightness)
		opmode = MODES_STASNDBY;

	switch (opmode) {
	case MODES_TORCH:
		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
					 TORCH_I_MASK << TORCH_I_SHIFT,
					 (brightness - 1) << TORCH_I_SHIFT);

		if (chip->torch_pin)
			opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
		break;

	case MODES_FLASH:
		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
					 FLASH_I_MASK << FLASH_I_SHIFT,
					 (brightness - 1) << FLASH_I_SHIFT);

		if (chip->strobe_pin)
			opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
		break;

	case MODES_INDIC:
		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
					 TORCH_I_MASK << TORCH_I_SHIFT,
					 (brightness - 1) << TORCH_I_SHIFT);
		break;

	case MODES_STASNDBY:

		break;

	default:
		return ret;
	}
	if (ret < 0) {
		dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
		goto out;
	}

	if (chip->tx_pin)
		opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);

	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
				 MODE_BITS_MASK << MODE_BITS_SHIFT,
				 opmode << MODE_BITS_SHIFT);
out:
	return ret;
}

/* torch */

/* torch pin config for lm3642*/
static ssize_t lm3642_torch_pin_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t size)
{
	ssize_t ret;
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3642_chip_data *chip =
	    container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	unsigned int state;

	ret = kstrtouint(buf, 10, &state);
	if (ret)
		goto out_strtoint;
	if (state != 0)
		state = 0x01 << TORCH_PIN_EN_SHIFT;

	chip->torch_pin = state;
	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
				 TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
				 state);
	if (ret < 0)
		goto out;

	return size;
out:
	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
	return ret;
out_strtoint:
	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
	return ret;
}

static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);

static int lm3642_torch_brightness_set(struct led_classdev *cdev,
					enum led_brightness brightness)
{
	struct lm3642_chip_data *chip =
	    container_of(cdev, struct lm3642_chip_data, cdev_torch);
	int ret;

	mutex_lock(&chip->lock);
	chip->br_torch = brightness;
	ret = lm3642_control(chip, chip->br_torch, MODES_TORCH);
	mutex_unlock(&chip->lock);
	return ret;
}

/* flash */

/* strobe pin config for lm3642*/
static ssize_t lm3642_strobe_pin_store(struct device *dev,
				       struct device_attribute *attr,
				       const char *buf, size_t size)
{
	ssize_t ret;
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3642_chip_data *chip =
	    container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	unsigned int state;

	ret = kstrtouint(buf, 10, &state);
	if (ret)
		goto out_strtoint;
	if (state != 0)
		state = 0x01 << STROBE_PIN_EN_SHIFT;

	chip->strobe_pin = state;
	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
				 STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
				 state);
	if (ret < 0)
		goto out;

	return size;
out:
	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
	return ret;
out_strtoint:
	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
	return ret;
}

static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);

static int lm3642_strobe_brightness_set(struct led_classdev *cdev,
					 enum led_brightness brightness)
{
	struct lm3642_chip_data *chip =
	    container_of(cdev, struct lm3642_chip_data, cdev_flash);
	int ret;

	mutex_lock(&chip->lock);
	chip->br_flash = brightness;
	ret = lm3642_control(chip, chip->br_flash, MODES_FLASH);
	mutex_unlock(&chip->lock);
	return ret;
}

/* indicator */
static int lm3642_indicator_brightness_set(struct led_classdev *cdev,
					    enum led_brightness brightness)
{
	struct lm3642_chip_data *chip =
	    container_of(cdev, struct lm3642_chip_data, cdev_indicator);
	int ret;

	mutex_lock(&chip->lock);
	chip->br_indicator = brightness;
	ret = lm3642_control(chip, chip->br_indicator, MODES_INDIC);
	mutex_unlock(&chip->lock);
	return ret;
}

static const struct regmap_config lm3642_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = REG_MAX,
};

static struct attribute *lm3642_flash_attrs[] = {
	&dev_attr_strobe_pin.attr,
	NULL
};
ATTRIBUTE_GROUPS(lm3642_flash);

static struct attribute *lm3642_torch_attrs[] = {
	&dev_attr_torch_pin.attr,
	NULL
};
ATTRIBUTE_GROUPS(lm3642_torch);

static int lm3642_probe(struct i2c_client *client,
				  const struct i2c_device_id *id)
{
	struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev);
	struct lm3642_chip_data *chip;

	int err;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "i2c functionality check fail.\n");
		return -EOPNOTSUPP;
	}

	if (pdata == NULL) {
		dev_err(&client->dev, "needs Platform Data.\n");
		return -ENODATA;
	}

	chip = devm_kzalloc(&client->dev,
			    sizeof(struct lm3642_chip_data), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->dev = &client->dev;
	chip->pdata = pdata;

	chip->tx_pin = pdata->tx_pin;
	chip->torch_pin = pdata->torch_pin;
	chip->strobe_pin = pdata->strobe_pin;

	chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
	if (IS_ERR(chip->regmap)) {
		err = PTR_ERR(chip->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			err);
		return err;
	}

	mutex_init(&chip->lock);
	i2c_set_clientdata(client, chip);

	err = lm3642_chip_init(chip);
	if (err < 0)
		goto err_out;

	/* flash */
	chip->cdev_flash.name = "flash";
	chip->cdev_flash.max_brightness = 16;
	chip->cdev_flash.brightness_set_blocking = lm3642_strobe_brightness_set;
	chip->cdev_flash.default_trigger = "flash";
	chip->cdev_flash.groups = lm3642_flash_groups,
	err = led_classdev_register((struct device *)
				    &client->dev, &chip->cdev_flash);
	if (err < 0) {
		dev_err(chip->dev, "failed to register flash\n");
		goto err_out;
	}

	/* torch */
	chip->cdev_torch.name = "torch";
	chip->cdev_torch.max_brightness = 8;
	chip->cdev_torch.brightness_set_blocking = lm3642_torch_brightness_set;
	chip->cdev_torch.default_trigger = "torch";
	chip->cdev_torch.groups = lm3642_torch_groups,
	err = led_classdev_register((struct device *)
				    &client->dev, &chip->cdev_torch);
	if (err < 0) {
		dev_err(chip->dev, "failed to register torch\n");
		goto err_create_torch_file;
	}

	/* indicator */
	chip->cdev_indicator.name = "indicator";
	chip->cdev_indicator.max_brightness = 8;
	chip->cdev_indicator.brightness_set_blocking =
						lm3642_indicator_brightness_set;
	err = led_classdev_register((struct device *)
				    &client->dev, &chip->cdev_indicator);
	if (err < 0) {
		dev_err(chip->dev, "failed to register indicator\n");
		goto err_create_indicator_file;
	}

	dev_info(&client->dev, "LM3642 is initialized\n");
	return 0;

err_create_indicator_file:
	led_classdev_unregister(&chip->cdev_torch);
err_create_torch_file:
	led_classdev_unregister(&chip->cdev_flash);
err_out:
	return err;
}

static int lm3642_remove(struct i2c_client *client)
{
	struct lm3642_chip_data *chip = i2c_get_clientdata(client);

	led_classdev_unregister(&chip->cdev_indicator);
	led_classdev_unregister(&chip->cdev_torch);
	led_classdev_unregister(&chip->cdev_flash);
	regmap_write(chip->regmap, REG_ENABLE, 0);
	return 0;
}

static const struct i2c_device_id lm3642_id[] = {
	{LM3642_NAME, 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, lm3642_id);

static struct i2c_driver lm3642_i2c_driver = {
	.driver = {
		   .name = LM3642_NAME,
		   .pm = NULL,
		   },
	.probe = lm3642_probe,
	.remove = lm3642_remove,
	.id_table = lm3642_id,
};

module_i2c_driver(lm3642_i2c_driver);

MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
8b7cfbec SJ	1	/*
	2	* Simple driver for Texas Instruments LM3642 LED Flash driver chip
	3	* Copyright (C) 2012 Texas Instruments
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	*/
	10	#include <linux/module.h>
	11	#include <linux/delay.h>
	12	#include <linux/i2c.h>
	13	#include <linux/leds.h>
	14	#include <linux/slab.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/fs.h>
	17	#include <linux/regmap.h>
8b7cfbec SJ	18	#include <linux/platform_data/leds-lm3642.h>
	19
	20	#define REG_FILT_TIME (0x0)
	21	#define REG_IVFM_MODE (0x1)
	22	#define REG_TORCH_TIME (0x6)
	23	#define REG_FLASH (0x8)
	24	#define REG_I_CTRL (0x9)
	25	#define REG_ENABLE (0xA)
	26	#define REG_FLAG (0xB)
	27	#define REG_MAX (0xB)
	28
	29	#define UVLO_EN_SHIFT (7)
	30	#define IVM_D_TH_SHIFT (2)
	31	#define TORCH_RAMP_UP_TIME_SHIFT (3)
	32	#define TORCH_RAMP_DN_TIME_SHIFT (0)
	33	#define INDUCTOR_I_LIMIT_SHIFT (6)
	34	#define FLASH_RAMP_TIME_SHIFT (3)
	35	#define FLASH_TOUT_TIME_SHIFT (0)
	36	#define TORCH_I_SHIFT (4)
	37	#define FLASH_I_SHIFT (0)
	38	#define IVFM_SHIFT (7)
	39	#define TX_PIN_EN_SHIFT (6)
	40	#define STROBE_PIN_EN_SHIFT (5)
	41	#define TORCH_PIN_EN_SHIFT (4)
	42	#define MODE_BITS_SHIFT (0)
	43
	44	#define UVLO_EN_MASK (0x1)
	45	#define IVM_D_TH_MASK (0x7)
	46	#define TORCH_RAMP_UP_TIME_MASK (0x7)
	47	#define TORCH_RAMP_DN_TIME_MASK (0x7)
	48	#define INDUCTOR_I_LIMIT_MASK (0x1)
	49	#define FLASH_RAMP_TIME_MASK (0x7)
	50	#define FLASH_TOUT_TIME_MASK (0x7)
	51	#define TORCH_I_MASK (0x7)
	52	#define FLASH_I_MASK (0xF)
	53	#define IVFM_MASK (0x1)
	54	#define TX_PIN_EN_MASK (0x1)
	55	#define STROBE_PIN_EN_MASK (0x1)
	56	#define TORCH_PIN_EN_MASK (0x1)
	57	#define MODE_BITS_MASK (0x73)
	58	#define EX_PIN_CONTROL_MASK (0x71)
	59	#define EX_PIN_ENABLE_MASK (0x70)
	60
	61	enum lm3642_mode {
	62	MODES_STASNDBY = 0,
	63	MODES_INDIC,
	64	MODES_TORCH,
	65	MODES_FLASH
	66	};
	67
	68	struct lm3642_chip_data {
	69	struct device *dev;
	70
	71	struct led_classdev cdev_flash;
	72	struct led_classdev cdev_torch;
	73	struct led_classdev cdev_indicator;
	74
8b7cfbec SJ	75	u8 br_flash;
	76	u8 br_torch;
	77	u8 br_indicator;
	78
	79	enum lm3642_torch_pin_enable torch_pin;
	80	enum lm3642_strobe_pin_enable strobe_pin;
	81	enum lm3642_tx_pin_enable tx_pin;
	82
	83	struct lm3642_platform_data *pdata;
	84	struct regmap *regmap;
	85	struct mutex lock;
	86
	87	unsigned int last_flag;
	88	};
	89
	90	/* chip initialize */
98ea1ea2	91	static int lm3642_chip_init(struct lm3642_chip_data *chip)
8b7cfbec	92	{
8b7cfbec SJ	93	int ret;
	94	struct lm3642_platform_data *pdata = chip->pdata;
	95
	96	/* set enable register */
e76a322a AL	97	ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
e76a322a AL	98	pdata->tx_pin);
8b7cfbec	99	if (ret < 0)
e76a322a	100	dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
8b7cfbec SJ	101	return ret;
	102	}
	103
	104	/* chip control */
	105	static int lm3642_control(struct lm3642_chip_data *chip,
	106	u8 brightness, enum lm3642_mode opmode)
	107	{
	108	int ret;
	109
	110	ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
	111	if (ret < 0) {
	112	dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
	113	goto out;
	114	}
	115
	116	if (chip->last_flag)
	117	dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
	118
	119	/* brightness 0 means off-state */
	120	if (!brightness)
	121	opmode = MODES_STASNDBY;
	122
	123	switch (opmode) {
	124	case MODES_TORCH:
	125	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
	126	TORCH_I_MASK << TORCH_I_SHIFT,
	127	(brightness - 1) << TORCH_I_SHIFT);
	128
	129	if (chip->torch_pin)
	130	opmode \|= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
	131	break;
	132
	133	case MODES_FLASH:
	134	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
	135	FLASH_I_MASK << FLASH_I_SHIFT,
	136	(brightness - 1) << FLASH_I_SHIFT);
	137
	138	if (chip->strobe_pin)
	139	opmode \|= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
	140	break;
	141
	142	case MODES_INDIC:
	143	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
	144	TORCH_I_MASK << TORCH_I_SHIFT,
	145	(brightness - 1) << TORCH_I_SHIFT);
	146	break;
	147
	148	case MODES_STASNDBY:
	149
	150	break;
	151
	152	default:
	153	return ret;
	154	}
	155	if (ret < 0) {
	156	dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
	157	goto out;
	158	}
	159
	160	if (chip->tx_pin)
	161	opmode \|= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);
	162
	163	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
	164	MODE_BITS_MASK << MODE_BITS_SHIFT,
165	opmode << MODE_BITS_SHIFT);
166	out:
167	return ret;
168	}
169
170	/* torch */
171
172	/* torch pin config for lm3642*/
173	static ssize_t lm3642_torch_pin_store(struct device *dev,
85b4b756	174	struct device_attribute *attr,
8b7cfbec SJ	175	const char *buf, size_t size)
	176	{
	177	ssize_t ret;
	178	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	179	struct lm3642_chip_data *chip =
	180	container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	181	unsigned int state;
	182
	183	ret = kstrtouint(buf, 10, &state);
	184	if (ret)
	185	goto out_strtoint;
	186	if (state != 0)
	187	state = 0x01 << TORCH_PIN_EN_SHIFT;
	188
	189	chip->torch_pin = state;
	190	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
	191	TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
	192	state);
	193	if (ret < 0)
	194	goto out;
	195
	196	return size;
	197	out:
	198	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
eccb6638	199	return ret;
8b7cfbec SJ	200	out_strtoint:
8b7cfbec SJ	201	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
eccb6638	202	return ret;
8b7cfbec SJ	203	}
8b7cfbec SJ	204
5cce0105	205	static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);
8b7cfbec	206
bb58cc81	207	static int lm3642_torch_brightness_set(struct led_classdev *cdev,
8b7cfbec SJ	208	enum led_brightness brightness)
	209	{
	210	struct lm3642_chip_data *chip =
	211	container_of(cdev, struct lm3642_chip_data, cdev_torch);
bb58cc81	212	int ret;
8b7cfbec	213
bb58cc81	214	mutex_lock(&chip->lock);
8b7cfbec	215	chip->br_torch = brightness;
bb58cc81 AL	216	ret = lm3642_control(chip, chip->br_torch, MODES_TORCH);
	217	mutex_unlock(&chip->lock);
	218	return ret;
8b7cfbec SJ	219	}
	220
	221	/* flash */
	222
	223	/* strobe pin config for lm3642*/
	224	static ssize_t lm3642_strobe_pin_store(struct device *dev,
85b4b756	225	struct device_attribute *attr,
8b7cfbec SJ	226	const char *buf, size_t size)
	227	{
	228	ssize_t ret;
	229	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	230	struct lm3642_chip_data *chip =
	231	container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	232	unsigned int state;
	233
	234	ret = kstrtouint(buf, 10, &state);
	235	if (ret)
	236	goto out_strtoint;
	237	if (state != 0)
	238	state = 0x01 << STROBE_PIN_EN_SHIFT;
	239
	240	chip->strobe_pin = state;
	241	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
	242	STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
	243	state);
	244	if (ret < 0)
	245	goto out;
	246
	247	return size;
	248	out:
	249	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
eccb6638	250	return ret;
8b7cfbec SJ	251	out_strtoint:
8b7cfbec SJ	252	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
eccb6638	253	return ret;
8b7cfbec SJ	254	}
8b7cfbec SJ	255
5cce0105	256	static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);
8b7cfbec	257
bb58cc81	258	static int lm3642_strobe_brightness_set(struct led_classdev *cdev,
8b7cfbec SJ	259	enum led_brightness brightness)
	260	{
	261	struct lm3642_chip_data *chip =
	262	container_of(cdev, struct lm3642_chip_data, cdev_flash);
bb58cc81	263	int ret;
8b7cfbec SJ	264
8b7cfbec SJ	265	mutex_lock(&chip->lock);
bb58cc81 AL	266	chip->br_flash = brightness;
bb58cc81 AL	267	ret = lm3642_control(chip, chip->br_flash, MODES_FLASH);
8b7cfbec	268	mutex_unlock(&chip->lock);
bb58cc81	269	return ret;
8b7cfbec SJ	270	}
8b7cfbec SJ	271
bb58cc81 AL	272	/* indicator */
bb58cc81 AL	273	static int lm3642_indicator_brightness_set(struct led_classdev *cdev,
8b7cfbec SJ	274	enum led_brightness brightness)
	275	{
	276	struct lm3642_chip_data *chip =
	277	container_of(cdev, struct lm3642_chip_data, cdev_indicator);
bb58cc81	278	int ret;
8b7cfbec	279
bb58cc81	280	mutex_lock(&chip->lock);
8b7cfbec	281	chip->br_indicator = brightness;
bb58cc81 AL	282	ret = lm3642_control(chip, chip->br_indicator, MODES_INDIC);
	283	mutex_unlock(&chip->lock);
	284	return ret;
8b7cfbec SJ	285	}
	286
	287	static const struct regmap_config lm3642_regmap = {
	288	.reg_bits = 8,
	289	.val_bits = 8,
	290	.max_register = REG_MAX,
	291	};
	292
fe29a3b0 JH	293	static struct attribute *lm3642_flash_attrs[] = {
	294	&dev_attr_strobe_pin.attr,
	295	NULL
	296	};
	297	ATTRIBUTE_GROUPS(lm3642_flash);
	298
	299	static struct attribute *lm3642_torch_attrs[] = {
	300	&dev_attr_torch_pin.attr,
	301	NULL
	302	};
	303	ATTRIBUTE_GROUPS(lm3642_torch);
	304
98ea1ea2	305	static int lm3642_probe(struct i2c_client *client,
8b7cfbec SJ	306	const struct i2c_device_id *id)
8b7cfbec SJ	307	{
87aae1ea	308	struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev);
8b7cfbec SJ	309	struct lm3642_chip_data *chip;
	310
	311	int err;
	312
	313	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	314	dev_err(&client->dev, "i2c functionality check fail.\n");
	315	return -EOPNOTSUPP;
	316	}
	317
	318	if (pdata == NULL) {
	319	dev_err(&client->dev, "needs Platform Data.\n");
	320	return -ENODATA;
	321	}
	322
	323	chip = devm_kzalloc(&client->dev,
	324	sizeof(struct lm3642_chip_data), GFP_KERNEL);
	325	if (!chip)
	326	return -ENOMEM;
	327
	328	chip->dev = &client->dev;
	329	chip->pdata = pdata;
	330
	331	chip->tx_pin = pdata->tx_pin;
	332	chip->torch_pin = pdata->torch_pin;
	333	chip->strobe_pin = pdata->strobe_pin;
	334
	335	chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
	336	if (IS_ERR(chip->regmap)) {
	337	err = PTR_ERR(chip->regmap);
	338	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	339	err);
	340	return err;
	341	}
	342
	343	mutex_init(&chip->lock);
	344	i2c_set_clientdata(client, chip);
	345
	346	err = lm3642_chip_init(chip);
	347	if (err < 0)
	348	goto err_out;
	349
	350	/* flash */
8b7cfbec SJ	351	chip->cdev_flash.name = "flash";
8b7cfbec SJ	352	chip->cdev_flash.max_brightness = 16;
bb58cc81	353	chip->cdev_flash.brightness_set_blocking = lm3642_strobe_brightness_set;
313bf0b1	354	chip->cdev_flash.default_trigger = "flash";
fe29a3b0	355	chip->cdev_flash.groups = lm3642_flash_groups,
8b7cfbec SJ	356	err = led_classdev_register((struct device *)
	357	&client->dev, &chip->cdev_flash);
	358	if (err < 0) {
	359	dev_err(chip->dev, "failed to register flash\n");
	360	goto err_out;
	361	}
8b7cfbec SJ	362
8b7cfbec SJ	363	/* torch */
8b7cfbec SJ	364	chip->cdev_torch.name = "torch";
8b7cfbec SJ	365	chip->cdev_torch.max_brightness = 8;
bb58cc81	366	chip->cdev_torch.brightness_set_blocking = lm3642_torch_brightness_set;
313bf0b1	367	chip->cdev_torch.default_trigger = "torch";
fe29a3b0	368	chip->cdev_torch.groups = lm3642_torch_groups,
8b7cfbec SJ	369	err = led_classdev_register((struct device *)
	370	&client->dev, &chip->cdev_torch);
	371	if (err < 0) {
	372	dev_err(chip->dev, "failed to register torch\n");
	373	goto err_create_torch_file;
	374	}
8b7cfbec SJ	375
8b7cfbec SJ	376	/* indicator */
8b7cfbec SJ	377	chip->cdev_indicator.name = "indicator";
8b7cfbec SJ	378	chip->cdev_indicator.max_brightness = 8;
bb58cc81 AL	379	chip->cdev_indicator.brightness_set_blocking =
bb58cc81 AL	380	lm3642_indicator_brightness_set;
8b7cfbec SJ	381	err = led_classdev_register((struct device *)
	382	&client->dev, &chip->cdev_indicator);
	383	if (err < 0) {
	384	dev_err(chip->dev, "failed to register indicator\n");
	385	goto err_create_indicator_file;
	386	}
	387
	388	dev_info(&client->dev, "LM3642 is initialized\n");
	389	return 0;
	390
	391	err_create_indicator_file:
8b7cfbec SJ	392	led_classdev_unregister(&chip->cdev_torch);
8b7cfbec SJ	393	err_create_torch_file:
8b7cfbec SJ	394	led_classdev_unregister(&chip->cdev_flash);
	395	err_out:
	396	return err;
	397	}
	398
678e8a6b	399	static int lm3642_remove(struct i2c_client *client)
8b7cfbec SJ	400	{
	401	struct lm3642_chip_data *chip = i2c_get_clientdata(client);
	402
	403	led_classdev_unregister(&chip->cdev_indicator);
8b7cfbec	404	led_classdev_unregister(&chip->cdev_torch);
8b7cfbec	405	led_classdev_unregister(&chip->cdev_flash);
8b7cfbec SJ	406	regmap_write(chip->regmap, REG_ENABLE, 0);
	407	return 0;
	408	}
	409
	410	static const struct i2c_device_id lm3642_id[] = {
	411	{LM3642_NAME, 0},
	412	{}
	413	};
	414
	415	MODULE_DEVICE_TABLE(i2c, lm3642_id);
	416
	417	static struct i2c_driver lm3642_i2c_driver = {
	418	.driver = {
	419	.name = LM3642_NAME,
8b7cfbec SJ	420	.pm = NULL,
	421	},
	422	.probe = lm3642_probe,
df07cf81	423	.remove = lm3642_remove,
8b7cfbec SJ	424	.id_table = lm3642_id,
	425	};
	426
	427	module_i2c_driver(lm3642_i2c_driver);
	428
	429	MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
	430	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
	431	MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
	432	MODULE_LICENSE("GPL v2");