[deliverable/linux.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 __devinit lm3642_chip_init(struct lm3642_chip_data *chip)
{
	unsigned int reg_val;
	int ret;
	struct lm3642_platform_data *pdata = chip->pdata;

	/* set enable register */
	ret = regmap_read(chip->regmap, REG_ENABLE, &reg_val);
	if (ret < 0)
		goto out;

	reg_val &= (~EX_PIN_ENABLE_MASK);
	reg_val |= pdata->tx_pin;
	ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
	if (ret < 0)
		goto out;

out:
	dev_err(chip->dev, "Failed to read 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 *devAttr,
				      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 size;
out_strtoint:
	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
	return size;
}

static DEVICE_ATTR(torch_pin, 0666, 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 *devAttr,
				       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 size;
out_strtoint:
	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
	return size;
}

static DEVICE_ATTR(strobe_pin, 0666, 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 __devinit 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;
	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;
	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 __devexit 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 = __devexit_p(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 */
96	static int __devinit lm3642_chip_init(struct lm3642_chip_data *chip)
97	{
98	unsigned int reg_val;
99	int ret;
100	struct lm3642_platform_data *pdata = chip->pdata;
101
102	/* set enable register */
103	ret = regmap_read(chip->regmap, REG_ENABLE, &reg_val);
104	if (ret < 0)
105	goto out;
106
107	reg_val &= (~EX_PIN_ENABLE_MASK);
108	reg_val \|= pdata->tx_pin;
109	ret = regmap_write(chip->regmap, REG_ENABLE, reg_val);
110	if (ret < 0)
111	goto out;
112
113	out:
114	dev_err(chip->dev, "Failed to read REG_ENABLE Register\n");
115	return ret;
116	}
117
118	/* chip control */
119	static int lm3642_control(struct lm3642_chip_data *chip,
120	u8 brightness, enum lm3642_mode opmode)
121	{
122	int ret;
123
124	ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
125	if (ret < 0) {
126	dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
127	goto out;
128	}
129
130	if (chip->last_flag)
131	dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
132
133	/* brightness 0 means off-state */
134	if (!brightness)
135	opmode = MODES_STASNDBY;
136
137	switch (opmode) {
138	case MODES_TORCH:
139	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
140	TORCH_I_MASK << TORCH_I_SHIFT,
141	(brightness - 1) << TORCH_I_SHIFT);
142
143	if (chip->torch_pin)
144	opmode \|= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
145	break;
146
147	case MODES_FLASH:
148	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
149	FLASH_I_MASK << FLASH_I_SHIFT,
150	(brightness - 1) << FLASH_I_SHIFT);
151
152	if (chip->strobe_pin)
153	opmode \|= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
154	break;
155
156	case MODES_INDIC:
157	ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
158	TORCH_I_MASK << TORCH_I_SHIFT,
159	(brightness - 1) << TORCH_I_SHIFT);
160	break;
161
162	case MODES_STASNDBY:
163
164	break;
165
166	default:
167	return ret;
168	}
169	if (ret < 0) {
170	dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
171	goto out;
172	}
173
174	if (chip->tx_pin)
175	opmode \|= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);
176
177	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
178	MODE_BITS_MASK << MODE_BITS_SHIFT,
179	opmode << MODE_BITS_SHIFT);
180	out:
181	return ret;
182	}
183
184	/* torch */
185
186	/* torch pin config for lm3642*/
187	static ssize_t lm3642_torch_pin_store(struct device *dev,
188	struct device_attribute *devAttr,
189	const char *buf, size_t size)
190	{
191	ssize_t ret;
192	struct led_classdev *led_cdev = dev_get_drvdata(dev);
193	struct lm3642_chip_data *chip =
194	container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
195	unsigned int state;
196
197	ret = kstrtouint(buf, 10, &state);
198	if (ret)
199	goto out_strtoint;
200	if (state != 0)
201	state = 0x01 << TORCH_PIN_EN_SHIFT;
202
203	chip->torch_pin = state;
204	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
205	TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
206	state);
207	if (ret < 0)
208	goto out;
209
210	return size;
211	out:
212	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
213	return size;
214	out_strtoint:
215	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
216	return size;
217	}
218
219	static DEVICE_ATTR(torch_pin, 0666, NULL, lm3642_torch_pin_store);
220
221	static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
222	{
223	struct lm3642_chip_data *chip =
224	container_of(work, struct lm3642_chip_data, work_torch);
225
226	mutex_lock(&chip->lock);
227	lm3642_control(chip, chip->br_torch, MODES_TORCH);
228	mutex_unlock(&chip->lock);
229	}
230
231	static void lm3642_torch_brightness_set(struct led_classdev *cdev,
232	enum led_brightness brightness)
233	{
234	struct lm3642_chip_data *chip =
235	container_of(cdev, struct lm3642_chip_data, cdev_torch);
236
237	chip->br_torch = brightness;
238	schedule_work(&chip->work_torch);
239	}
240
241	/* flash */
242
243	/* strobe pin config for lm3642*/
244	static ssize_t lm3642_strobe_pin_store(struct device *dev,
245	struct device_attribute *devAttr,
246	const char *buf, size_t size)
247	{
248	ssize_t ret;
249	struct led_classdev *led_cdev = dev_get_drvdata(dev);
250	struct lm3642_chip_data *chip =
251	container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
252	unsigned int state;
253
254	ret = kstrtouint(buf, 10, &state);
255	if (ret)
256	goto out_strtoint;
257	if (state != 0)
258	state = 0x01 << STROBE_PIN_EN_SHIFT;
259
260	chip->strobe_pin = state;
261	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
262	STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
263	state);
264	if (ret < 0)
265	goto out;
266
267	return size;
268	out:
269	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
270	return size;
271	out_strtoint:
272	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
273	return size;
274	}
275
276	static DEVICE_ATTR(strobe_pin, 0666, NULL, lm3642_strobe_pin_store);
277
278	static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
279	{
280	struct lm3642_chip_data *chip =
281	container_of(work, struct lm3642_chip_data, work_flash);
282
283	mutex_lock(&chip->lock);
284	lm3642_control(chip, chip->br_flash, MODES_FLASH);
285	mutex_unlock(&chip->lock);
286	}
287
288	static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
289	enum led_brightness brightness)
290	{
291	struct lm3642_chip_data *chip =
292	container_of(cdev, struct lm3642_chip_data, cdev_flash);
293
294	chip->br_flash = brightness;
295	schedule_work(&chip->work_flash);
296	}
297
298	/* indicator */
299	static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
300	{
301	struct lm3642_chip_data *chip =
302	container_of(work, struct lm3642_chip_data, work_indicator);
303
304	mutex_lock(&chip->lock);
305	lm3642_control(chip, chip->br_indicator, MODES_INDIC);
306	mutex_unlock(&chip->lock);
307	}
308
309	static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
310	enum led_brightness brightness)
311	{
312	struct lm3642_chip_data *chip =
313	container_of(cdev, struct lm3642_chip_data, cdev_indicator);
314
315	chip->br_indicator = brightness;
316	schedule_work(&chip->work_indicator);
317	}
318
319	static const struct regmap_config lm3642_regmap = {
320	.reg_bits = 8,
321	.val_bits = 8,
322	.max_register = REG_MAX,
323	};
324
325	static int __devinit lm3642_probe(struct i2c_client *client,
326	const struct i2c_device_id *id)
327	{
328	struct lm3642_platform_data *pdata = client->dev.platform_data;
329	struct lm3642_chip_data *chip;
330
331	int err;
332
333	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
334	dev_err(&client->dev, "i2c functionality check fail.\n");
335	return -EOPNOTSUPP;
336	}
337
338	if (pdata == NULL) {
339	dev_err(&client->dev, "needs Platform Data.\n");
340	return -ENODATA;
341	}
342
343	chip = devm_kzalloc(&client->dev,
344	sizeof(struct lm3642_chip_data), GFP_KERNEL);
345	if (!chip)
346	return -ENOMEM;
347
348	chip->dev = &client->dev;
349	chip->pdata = pdata;
350
351	chip->tx_pin = pdata->tx_pin;
352	chip->torch_pin = pdata->torch_pin;
353	chip->strobe_pin = pdata->strobe_pin;
354
355	chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
356	if (IS_ERR(chip->regmap)) {
357	err = PTR_ERR(chip->regmap);
358	dev_err(&client->dev, "Failed to allocate register map: %d\n",
359	err);
360	return err;
361	}
362
363	mutex_init(&chip->lock);
364	i2c_set_clientdata(client, chip);
365
366	err = lm3642_chip_init(chip);
367	if (err < 0)
368	goto err_out;
369
370	/* flash */
371	INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
372	chip->cdev_flash.name = "flash";
373	chip->cdev_flash.max_brightness = 16;
374	chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
375	err = led_classdev_register((struct device *)
376	&client->dev, &chip->cdev_flash);
377	if (err < 0) {
378	dev_err(chip->dev, "failed to register flash\n");
379	goto err_out;
380	}
381	err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
382	if (err < 0) {
383	dev_err(chip->dev, "failed to create strobe-pin file\n");
384	goto err_create_flash_pin_file;
385	}
386
387	/* torch */
388	INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
389	chip->cdev_torch.name = "torch";
390	chip->cdev_torch.max_brightness = 8;
391	chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
392	err = led_classdev_register((struct device *)
393	&client->dev, &chip->cdev_torch);
394	if (err < 0) {
395	dev_err(chip->dev, "failed to register torch\n");
396	goto err_create_torch_file;
397	}
398	err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
399	if (err < 0) {
400	dev_err(chip->dev, "failed to create torch-pin file\n");
401	goto err_create_torch_pin_file;
402	}
403
404	/* indicator */
405	INIT_WORK(&chip->work_indicator,
406	lm3642_deferred_indicator_brightness_set);
407	chip->cdev_indicator.name = "indicator";
408	chip->cdev_indicator.max_brightness = 8;
409	chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
410	err = led_classdev_register((struct device *)
411	&client->dev, &chip->cdev_indicator);
412	if (err < 0) {
413	dev_err(chip->dev, "failed to register indicator\n");
414	goto err_create_indicator_file;
415	}
416
417	dev_info(&client->dev, "LM3642 is initialized\n");
418	return 0;
419
420	err_create_indicator_file:
421	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
422	err_create_torch_pin_file:
423	led_classdev_unregister(&chip->cdev_torch);
424	err_create_torch_file:
425	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
426	err_create_flash_pin_file:
427	led_classdev_unregister(&chip->cdev_flash);
428	err_out:
429	return err;
430	}
431
432	static int __devexit lm3642_remove(struct i2c_client *client)
433	{
434	struct lm3642_chip_data *chip = i2c_get_clientdata(client);
435
436	led_classdev_unregister(&chip->cdev_indicator);
437	flush_work(&chip->work_indicator);
438	device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin);
439	led_classdev_unregister(&chip->cdev_torch);
440	flush_work(&chip->work_torch);
441	device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin);
442	led_classdev_unregister(&chip->cdev_flash);
443	flush_work(&chip->work_flash);
444	regmap_write(chip->regmap, REG_ENABLE, 0);
445	return 0;
446	}
447
448	static const struct i2c_device_id lm3642_id[] = {
449	{LM3642_NAME, 0},
450	{}
451	};
452
453	MODULE_DEVICE_TABLE(i2c, lm3642_id);
454
455	static struct i2c_driver lm3642_i2c_driver = {
456	.driver = {
457	.name = LM3642_NAME,
458	.owner = THIS_MODULE,
459	.pm = NULL,
460	},
461	.probe = lm3642_probe,
462	.remove = __devexit_p(lm3642_remove),
463	.id_table = lm3642_id,
464	};
465
466	module_i2c_driver(lm3642_i2c_driver);
467
468	MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
469	MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
470	MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
471	MODULE_LICENSE("GPL v2");