[GitHub/mt8127/android_kernel_alcatel_ttab.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/workqueue.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;

	struct work_struct work_flash;
	struct work_struct work_torch;
	struct work_struct work_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 void lm3642_deferred_torch_brightness_set(struct work_struct *work)
{
	struct lm3642_chip_data *chip =
	    container_of(work, struct lm3642_chip_data, work_torch);

	mutex_lock(&chip->lock);
	lm3642_control(chip, chip->br_torch, MODES_TORCH);
	mutex_unlock(&chip->lock);
}

static void 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);

	chip->br_torch = brightness;
	schedule_work(&chip->work_torch);
}

/* 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 void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
{
	struct lm3642_chip_data *chip =
	    container_of(work, struct lm3642_chip_data, work_flash);

	mutex_lock(&chip->lock);
	lm3642_control(chip, chip->br_flash, MODES_FLASH);
	mutex_unlock(&chip->lock);
}

static void 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);

	chip->br_flash = brightness;
	schedule_work(&chip->work_flash);
}

/* indicator */
static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
{
	struct lm3642_chip_data *chip =
	    container_of(work, struct lm3642_chip_data, work_indicator);

	mutex_lock(&chip->lock);
	lm3642_control(chip, chip->br_indicator, MODES_INDIC);
	mutex_unlock(&chip->lock);
}

static void 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);

	chip->br_indicator = brightness;
	schedule_work(&chip->work_indicator);
}

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

static int lm3642_probe(struct i2c_client *client,
				  const struct i2c_device_id *id)
{
	struct lm3642_platform_data *pdata = client->dev.platform_data;
	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 */
	INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
	chip->cdev_flash.name = "flash";
	chip->cdev_flash.max_brightness = 16;
	chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
	chip->cdev_flash.default_trigger = "flash";
	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;
	}
	err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
	if (err < 0) {
		dev_err(chip->dev, "failed to create strobe-pin file\n");
		goto err_create_flash_pin_file;
	}

	/* torch */
	INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
	chip->cdev_torch.name = "torch";
	chip->cdev_torch.max_brightness = 8;
	chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
	chip->cdev_torch.default_trigger = "torch";
	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;
	}
	err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
	if (err < 0) {
		dev_err(chip->dev, "failed to create torch-pin file\n");
		goto err_create_torch_pin_file;
	}

	/* indicator */
	INIT_WORK(&chip->work_indicator,
		  lm3642_deferred_indicator_brightness_set);
	chip->cdev_indicator.name = "indicator";
	chip->cdev_indicator.max_brightness = 8;
	chip->cdev_indicator.brightness_set = 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:
	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
err_create_torch_pin_file:
	led_classdev_unregister(&chip->cdev_torch);
err_create_torch_file:
	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
err_create_flash_pin_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);
	flush_work(&chip->work_indicator);
	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
	led_classdev_unregister(&chip->cdev_torch);
	flush_work(&chip->work_torch);
	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
	led_classdev_unregister(&chip->cdev_flash);
	flush_work(&chip->work_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,
		   .owner = THIS_MODULE,
		   .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>
	18	#include <linux/workqueue.h>
	19	#include <linux/platform_data/leds-lm3642.h>
	20
	21	#define REG_FILT_TIME (0x0)
	22	#define REG_IVFM_MODE (0x1)
	23	#define REG_TORCH_TIME (0x6)
	24	#define REG_FLASH (0x8)
	25	#define REG_I_CTRL (0x9)
	26	#define REG_ENABLE (0xA)
	27	#define REG_FLAG (0xB)
	28	#define REG_MAX (0xB)
	29
	30	#define UVLO_EN_SHIFT (7)
	31	#define IVM_D_TH_SHIFT (2)
	32	#define TORCH_RAMP_UP_TIME_SHIFT (3)
	33	#define TORCH_RAMP_DN_TIME_SHIFT (0)
	34	#define INDUCTOR_I_LIMIT_SHIFT (6)
	35	#define FLASH_RAMP_TIME_SHIFT (3)
	36	#define FLASH_TOUT_TIME_SHIFT (0)
	37	#define TORCH_I_SHIFT (4)
	38	#define FLASH_I_SHIFT (0)
	39	#define IVFM_SHIFT (7)
	40	#define TX_PIN_EN_SHIFT (6)
	41	#define STROBE_PIN_EN_SHIFT (5)
	42	#define TORCH_PIN_EN_SHIFT (4)
	43	#define MODE_BITS_SHIFT (0)
	44
	45	#define UVLO_EN_MASK (0x1)
	46	#define IVM_D_TH_MASK (0x7)
	47	#define TORCH_RAMP_UP_TIME_MASK (0x7)
	48	#define TORCH_RAMP_DN_TIME_MASK (0x7)
	49	#define INDUCTOR_I_LIMIT_MASK (0x1)
	50	#define FLASH_RAMP_TIME_MASK (0x7)
	51	#define FLASH_TOUT_TIME_MASK (0x7)
	52	#define TORCH_I_MASK (0x7)
	53	#define FLASH_I_MASK (0xF)
	54	#define IVFM_MASK (0x1)
	55	#define TX_PIN_EN_MASK (0x1)
	56	#define STROBE_PIN_EN_MASK (0x1)
	57	#define TORCH_PIN_EN_MASK (0x1)
	58	#define MODE_BITS_MASK (0x73)
	59	#define EX_PIN_CONTROL_MASK (0x71)
	60	#define EX_PIN_ENABLE_MASK (0x70)
	61
	62	enum lm3642_mode {
	63	MODES_STASNDBY = 0,
	64	MODES_INDIC,
65	MODES_TORCH,
66	MODES_FLASH
67	};
68
69	struct lm3642_chip_data {
70	struct device *dev;
71
72	struct led_classdev cdev_flash;
73	struct led_classdev cdev_torch;
74	struct led_classdev cdev_indicator;
75
76	struct work_struct work_flash;
77	struct work_struct work_torch;
78	struct work_struct work_indicator;
79
80	u8 br_flash;
81	u8 br_torch;
82	u8 br_indicator;
83
84	enum lm3642_torch_pin_enable torch_pin;
85	enum lm3642_strobe_pin_enable strobe_pin;
86	enum lm3642_tx_pin_enable tx_pin;
87
88	struct lm3642_platform_data *pdata;
89	struct regmap *regmap;
90	struct mutex lock;
91
92	unsigned int last_flag;
93	};
94
95	/* chip initialize */
98ea1ea2	96	static int lm3642_chip_init(struct lm3642_chip_data *chip)
8b7cfbec	97	{
8b7cfbec SJ	98	int ret;
	99	struct lm3642_platform_data *pdata = chip->pdata;
	100
	101	/* set enable register */
e76a322a AL	102	ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
e76a322a AL	103	pdata->tx_pin);
8b7cfbec	104	if (ret < 0)
e76a322a	105	dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
8b7cfbec SJ	106	return ret;
	107	}
	108
	109	/* chip control */
	110	static int lm3642_control(struct lm3642_chip_data *chip,
	111	u8 brightness, enum lm3642_mode opmode)
	112	{
	113	int ret;
	114
	115	ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
	116	if (ret < 0) {
	117	dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
	118	goto out;
	119	}
	120
	121	if (chip->last_flag)
	122	dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
	123
	124	/* brightness 0 means off-state */
	125	if (!brightness)
	126	opmode = MODES_STASNDBY;
	127
	128	switch (opmode) {
	129	case MODES_TORCH:
	130	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
	131	TORCH_I_MASK << TORCH_I_SHIFT,
	132	(brightness - 1) << TORCH_I_SHIFT);
	133
	134	if (chip->torch_pin)
	135	opmode \|= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
	136	break;
	137
	138	case MODES_FLASH:
	139	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
	140	FLASH_I_MASK << FLASH_I_SHIFT,
	141	(brightness - 1) << FLASH_I_SHIFT);
	142
	143	if (chip->strobe_pin)
	144	opmode \|= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
	145	break;
	146
	147	case MODES_INDIC:
	148	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
	149	TORCH_I_MASK << TORCH_I_SHIFT,
	150	(brightness - 1) << TORCH_I_SHIFT);
	151	break;
	152
	153	case MODES_STASNDBY:
	154
	155	break;
	156
	157	default:
	158	return ret;
	159	}
	160	if (ret < 0) {
	161	dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
	162	goto out;
	163	}
	164
	165	if (chip->tx_pin)
	166	opmode \|= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);
	167
	168	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
	169	MODE_BITS_MASK << MODE_BITS_SHIFT,
170	opmode << MODE_BITS_SHIFT);
171	out:
172	return ret;
173	}
174
175	/* torch */
176
177	/* torch pin config for lm3642*/
178	static ssize_t lm3642_torch_pin_store(struct device *dev,
85b4b756	179	struct device_attribute *attr,
8b7cfbec SJ	180	const char *buf, size_t size)
	181	{
	182	ssize_t ret;
	183	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	184	struct lm3642_chip_data *chip =
	185	container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	186	unsigned int state;
	187
	188	ret = kstrtouint(buf, 10, &state);
	189	if (ret)
	190	goto out_strtoint;
	191	if (state != 0)
	192	state = 0x01 << TORCH_PIN_EN_SHIFT;
	193
	194	chip->torch_pin = state;
	195	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
	196	TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
	197	state);
	198	if (ret < 0)
	199	goto out;
	200
	201	return size;
	202	out:
	203	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
eccb6638	204	return ret;
8b7cfbec SJ	205	out_strtoint:
8b7cfbec SJ	206	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
eccb6638	207	return ret;
8b7cfbec SJ	208	}
8b7cfbec SJ	209
5cce0105	210	static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);
8b7cfbec SJ	211
	212	static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
	213	{
	214	struct lm3642_chip_data *chip =
	215	container_of(work, struct lm3642_chip_data, work_torch);
	216
	217	mutex_lock(&chip->lock);
	218	lm3642_control(chip, chip->br_torch, MODES_TORCH);
	219	mutex_unlock(&chip->lock);
	220	}
	221
	222	static void lm3642_torch_brightness_set(struct led_classdev *cdev,
	223	enum led_brightness brightness)
	224	{
	225	struct lm3642_chip_data *chip =
	226	container_of(cdev, struct lm3642_chip_data, cdev_torch);
	227
	228	chip->br_torch = brightness;
	229	schedule_work(&chip->work_torch);
	230	}
	231
	232	/* flash */
	233
	234	/* strobe pin config for lm3642*/
	235	static ssize_t lm3642_strobe_pin_store(struct device *dev,
85b4b756	236	struct device_attribute *attr,
8b7cfbec SJ	237	const char *buf, size_t size)
	238	{
	239	ssize_t ret;
	240	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	241	struct lm3642_chip_data *chip =
	242	container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	243	unsigned int state;
	244
	245	ret = kstrtouint(buf, 10, &state);
	246	if (ret)
	247	goto out_strtoint;
	248	if (state != 0)
	249	state = 0x01 << STROBE_PIN_EN_SHIFT;
	250
	251	chip->strobe_pin = state;
	252	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
	253	STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
	254	state);
	255	if (ret < 0)
	256	goto out;
	257
	258	return size;
	259	out:
	260	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
eccb6638	261	return ret;
8b7cfbec SJ	262	out_strtoint:
8b7cfbec SJ	263	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
eccb6638	264	return ret;
8b7cfbec SJ	265	}
8b7cfbec SJ	266
5cce0105	267	static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);
8b7cfbec SJ	268
	269	static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
	270	{
	271	struct lm3642_chip_data *chip =
	272	container_of(work, struct lm3642_chip_data, work_flash);
	273
	274	mutex_lock(&chip->lock);
	275	lm3642_control(chip, chip->br_flash, MODES_FLASH);
	276	mutex_unlock(&chip->lock);
	277	}
	278
	279	static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
	280	enum led_brightness brightness)
	281	{
	282	struct lm3642_chip_data *chip =
	283	container_of(cdev, struct lm3642_chip_data, cdev_flash);
	284
	285	chip->br_flash = brightness;
	286	schedule_work(&chip->work_flash);
	287	}
	288
	289	/* indicator */
	290	static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
	291	{
	292	struct lm3642_chip_data *chip =
	293	container_of(work, struct lm3642_chip_data, work_indicator);
	294
	295	mutex_lock(&chip->lock);
	296	lm3642_control(chip, chip->br_indicator, MODES_INDIC);
	297	mutex_unlock(&chip->lock);
	298	}
	299
	300	static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
	301	enum led_brightness brightness)
	302	{
	303	struct lm3642_chip_data *chip =
	304	container_of(cdev, struct lm3642_chip_data, cdev_indicator);
	305
	306	chip->br_indicator = brightness;
	307	schedule_work(&chip->work_indicator);
	308	}
	309
	310	static const struct regmap_config lm3642_regmap = {
	311	.reg_bits = 8,
	312	.val_bits = 8,
	313	.max_register = REG_MAX,
	314	};
	315
98ea1ea2	316	static int lm3642_probe(struct i2c_client *client,
8b7cfbec SJ	317	const struct i2c_device_id *id)
	318	{
	319	struct lm3642_platform_data *pdata = client->dev.platform_data;
	320	struct lm3642_chip_data *chip;
	321
	322	int err;
	323
	324	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	325	dev_err(&client->dev, "i2c functionality check fail.\n");
	326	return -EOPNOTSUPP;
	327	}
	328
	329	if (pdata == NULL) {
	330	dev_err(&client->dev, "needs Platform Data.\n");
	331	return -ENODATA;
	332	}
	333
	334	chip = devm_kzalloc(&client->dev,
	335	sizeof(struct lm3642_chip_data), GFP_KERNEL);
	336	if (!chip)
	337	return -ENOMEM;
	338
	339	chip->dev = &client->dev;
	340	chip->pdata = pdata;
	341
	342	chip->tx_pin = pdata->tx_pin;
	343	chip->torch_pin = pdata->torch_pin;
	344	chip->strobe_pin = pdata->strobe_pin;
	345
	346	chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
	347	if (IS_ERR(chip->regmap)) {
	348	err = PTR_ERR(chip->regmap);
	349	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	350	err);
	351	return err;
	352	}
	353
	354	mutex_init(&chip->lock);
	355	i2c_set_clientdata(client, chip);
	356
	357	err = lm3642_chip_init(chip);
	358	if (err < 0)
	359	goto err_out;
	360
	361	/* flash */
	362	INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
	363	chip->cdev_flash.name = "flash";
	364	chip->cdev_flash.max_brightness = 16;
	365	chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
313bf0b1	366	chip->cdev_flash.default_trigger = "flash";
8b7cfbec SJ	367	err = led_classdev_register((struct device *)
	368	&client->dev, &chip->cdev_flash);
	369	if (err < 0) {
	370	dev_err(chip->dev, "failed to register flash\n");
	371	goto err_out;
	372	}
	373	err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
	374	if (err < 0) {
	375	dev_err(chip->dev, "failed to create strobe-pin file\n");
	376	goto err_create_flash_pin_file;
	377	}
	378
	379	/* torch */
	380	INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
	381	chip->cdev_torch.name = "torch";
	382	chip->cdev_torch.max_brightness = 8;
	383	chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
313bf0b1	384	chip->cdev_torch.default_trigger = "torch";
8b7cfbec SJ	385	err = led_classdev_register((struct device *)
	386	&client->dev, &chip->cdev_torch);
	387	if (err < 0) {
	388	dev_err(chip->dev, "failed to register torch\n");
	389	goto err_create_torch_file;
	390	}
	391	err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
	392	if (err < 0) {
	393	dev_err(chip->dev, "failed to create torch-pin file\n");
	394	goto err_create_torch_pin_file;
	395	}
	396
	397	/* indicator */
	398	INIT_WORK(&chip->work_indicator,
	399	lm3642_deferred_indicator_brightness_set);
	400	chip->cdev_indicator.name = "indicator";
	401	chip->cdev_indicator.max_brightness = 8;
	402	chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
	403	err = led_classdev_register((struct device *)
	404	&client->dev, &chip->cdev_indicator);
	405	if (err < 0) {
	406	dev_err(chip->dev, "failed to register indicator\n");
	407	goto err_create_indicator_file;
	408	}
	409
	410	dev_info(&client->dev, "LM3642 is initialized\n");
	411	return 0;
	412
	413	err_create_indicator_file:
	414	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
	415	err_create_torch_pin_file:
	416	led_classdev_unregister(&chip->cdev_torch);
	417	err_create_torch_file:
	418	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
	419	err_create_flash_pin_file:
	420	led_classdev_unregister(&chip->cdev_flash);
	421	err_out:
	422	return err;
	423	}
	424
678e8a6b	425	static int lm3642_remove(struct i2c_client *client)
8b7cfbec SJ	426	{
	427	struct lm3642_chip_data *chip = i2c_get_clientdata(client);
	428
	429	led_classdev_unregister(&chip->cdev_indicator);
	430	flush_work(&chip->work_indicator);
	431	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
	432	led_classdev_unregister(&chip->cdev_torch);
	433	flush_work(&chip->work_torch);
	434	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
	435	led_classdev_unregister(&chip->cdev_flash);
	436	flush_work(&chip->work_flash);
	437	regmap_write(chip->regmap, REG_ENABLE, 0);
	438	return 0;
	439	}
	440
	441	static const struct i2c_device_id lm3642_id[] = {
	442	{LM3642_NAME, 0},
	443	{}
	444	};
	445
	446	MODULE_DEVICE_TABLE(i2c, lm3642_id);
	447
	448	static struct i2c_driver lm3642_i2c_driver = {
	449	.driver = {
	450	.name = LM3642_NAME,
	451	.owner = THIS_MODULE,
	452	.pm = NULL,
	453	},
	454	.probe = lm3642_probe,
df07cf81	455	.remove = lm3642_remove,
8b7cfbec SJ	456	.id_table = lm3642_id,
	457	};
	458
	459	module_i2c_driver(lm3642_i2c_driver);
	460
	461	MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
	462	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
	463	MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
	464	MODULE_LICENSE("GPL v2");