drivers/media/i2c/lm3560.c - kernel/msm-4.9 - Gitiles

 /*
  * drivers/media/i2c/lm3560.c
  * General device driver for TI lm3560, FLASH LED Driver
  *
  * Copyright (C) 2013 Texas Instruments
  *
  * Contact: Daniel Jeong <gshark.jeong@gmail.com>
  *			Ldd-Mlp <ldd-mlp@list.ti.com>
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/regmap.h>
 #include <linux/videodev2.h>
 #include <media/lm3560.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>

 /* registers definitions */
 #define REG_ENABLE		0x10
 #define REG_TORCH_BR	0xa0
 #define REG_FLASH_BR	0xb0
 #define REG_FLASH_TOUT	0xc0
 #define REG_FLAG		0xd0
 #define REG_CONFIG1		0xe0

 /* Fault Mask */
 #define FAULT_TIMEOUT	(1<<0)
 #define FAULT_OVERTEMP	(1<<1)
 #define FAULT_SHORT_CIRCUIT	(1<<2)

 enum led_enable {
 	MODE_SHDN = 0x0,
 	MODE_TORCH = 0x2,
 	MODE_FLASH = 0x3,
 };

 /* struct lm3560_flash
  *
  * @pdata: platform data
  * @regmap: reg. map for i2c
  * @lock: muxtex for serial access.
  * @led_mode: V4L2 LED mode
  * @ctrls_led: V4L2 contols
  * @subdev_led: V4L2 subdev
  */
 struct lm3560_flash {
 	struct device *dev;
 	struct lm3560_platform_data *pdata;
 	struct regmap *regmap;
 	struct mutex lock;

 	enum v4l2_flash_led_mode led_mode;
 	struct v4l2_ctrl_handler ctrls_led[LM3560_LED_MAX];
 	struct v4l2_subdev subdev_led[LM3560_LED_MAX];
 };

 #define to_lm3560_flash(_ctrl, _no)	\
 	container_of(_ctrl->handler, struct lm3560_flash, ctrls_led[_no])

 /* enable mode control */
 static int lm3560_mode_ctrl(struct lm3560_flash *flash)
 {
 	int rval = -EINVAL;

 	switch (flash->led_mode) {
 	case V4L2_FLASH_LED_MODE_NONE:
 		rval = regmap_update_bits(flash->regmap,
 					  REG_ENABLE, 0x03, MODE_SHDN);
 		break;
 	case V4L2_FLASH_LED_MODE_TORCH:
 		rval = regmap_update_bits(flash->regmap,
 					  REG_ENABLE, 0x03, MODE_TORCH);
 		break;
 	case V4L2_FLASH_LED_MODE_FLASH:
 		rval = regmap_update_bits(flash->regmap,
 					  REG_ENABLE, 0x03, MODE_FLASH);
 		break;
 	}
 	return rval;
 }

 /* led1/2  enable/disable */
 static int lm3560_enable_ctrl(struct lm3560_flash *flash,
 			      enum lm3560_led_id led_no, bool on)
 {
 	int rval;

 	if (led_no == LM3560_LED0) {
 		if (on == true)
 			rval = regmap_update_bits(flash->regmap,
 						  REG_ENABLE, 0x08, 0x08);
 		else
 			rval = regmap_update_bits(flash->regmap,
 						  REG_ENABLE, 0x08, 0x00);
 	} else {
 		if (on == true)
 			rval = regmap_update_bits(flash->regmap,
 						  REG_ENABLE, 0x10, 0x10);
 		else
 			rval = regmap_update_bits(flash->regmap,
 						  REG_ENABLE, 0x10, 0x00);
 	}
 	return rval;
 }

 /* torch1/2 brightness control */
 static int lm3560_torch_brt_ctrl(struct lm3560_flash *flash,
 				 enum lm3560_led_id led_no, unsigned int brt)
 {
 	int rval;
 	u8 br_bits;

 	if (brt < LM3560_TORCH_BRT_MIN)
 		return lm3560_enable_ctrl(flash, led_no, false);
 	else
 		rval = lm3560_enable_ctrl(flash, led_no, true);

 	br_bits = LM3560_TORCH_BRT_uA_TO_REG(brt);
 	if (led_no == LM3560_LED0)
 		rval = regmap_update_bits(flash->regmap,
 					  REG_TORCH_BR, 0x07, br_bits);
 	else
 		rval = regmap_update_bits(flash->regmap,
 					  REG_TORCH_BR, 0x38, br_bits << 3);

 	return rval;
 }

 /* flash1/2 brightness control */
 static int lm3560_flash_brt_ctrl(struct lm3560_flash *flash,
 				 enum lm3560_led_id led_no, unsigned int brt)
 {
 	int rval;
 	u8 br_bits;

 	if (brt < LM3560_FLASH_BRT_MIN)
 		return lm3560_enable_ctrl(flash, led_no, false);
 	else
 		rval = lm3560_enable_ctrl(flash, led_no, true);

 	br_bits = LM3560_FLASH_BRT_uA_TO_REG(brt);
 	if (led_no == LM3560_LED0)
 		rval = regmap_update_bits(flash->regmap,
 					  REG_FLASH_BR, 0x0f, br_bits);
 	else
 		rval = regmap_update_bits(flash->regmap,
 					  REG_FLASH_BR, 0xf0, br_bits << 4);

 	return rval;
 }

 /* V4L2 controls  */
 static int lm3560_get_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
 {
 	struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);

 	mutex_lock(&flash->lock);

 	if (ctrl->id == V4L2_CID_FLASH_FAULT) {
 		int rval;
 		s32 fault = 0;
 		unsigned int reg_val;
 		rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
 		if (rval < 0)
 			return rval;
 		if (rval & FAULT_SHORT_CIRCUIT)
 			fault |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
 		if (rval & FAULT_OVERTEMP)
 			fault |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
 		if (rval & FAULT_TIMEOUT)
 			fault |= V4L2_FLASH_FAULT_TIMEOUT;
 		ctrl->cur.val = fault;
 		return 0;
 	}

 	mutex_unlock(&flash->lock);
 	return -EINVAL;
 }

 static int lm3560_set_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
 {
 	struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);
 	u8 tout_bits;
 	int rval = -EINVAL;

 	mutex_lock(&flash->lock);

 	switch (ctrl->id) {
 	case V4L2_CID_FLASH_LED_MODE:
 		flash->led_mode = ctrl->val;
 		if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
 			rval = lm3560_mode_ctrl(flash);
 		break;

 	case V4L2_CID_FLASH_STROBE_SOURCE:
 		rval = regmap_update_bits(flash->regmap,
 					  REG_CONFIG1, 0x04, (ctrl->val) << 2);
 		if (rval < 0)
 			goto err_out;
 		break;

 	case V4L2_CID_FLASH_STROBE:
 		if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
 			return -EBUSY;
 		flash->led_mode = V4L2_FLASH_LED_MODE_FLASH;
 		rval = lm3560_mode_ctrl(flash);
 		break;

 	case V4L2_CID_FLASH_STROBE_STOP:
 		if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
 			return -EBUSY;
 		flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
 		rval = lm3560_mode_ctrl(flash);
 		break;

 	case V4L2_CID_FLASH_TIMEOUT:
 		tout_bits = LM3560_FLASH_TOUT_ms_TO_REG(ctrl->val);
 		rval = regmap_update_bits(flash->regmap,
 					  REG_FLASH_TOUT, 0x1f, tout_bits);
 		break;

 	case V4L2_CID_FLASH_INTENSITY:
 		rval = lm3560_flash_brt_ctrl(flash, led_no, ctrl->val);
 		break;

 	case V4L2_CID_FLASH_TORCH_INTENSITY:
 		rval = lm3560_torch_brt_ctrl(flash, led_no, ctrl->val);
 		break;
 	}

 	mutex_unlock(&flash->lock);
 err_out:
 	return rval;
 }

 static int lm3560_led1_get_ctrl(struct v4l2_ctrl *ctrl)
 {
 	return lm3560_get_ctrl(ctrl, LM3560_LED1);
 }

 static int lm3560_led1_set_ctrl(struct v4l2_ctrl *ctrl)
 {
 	return lm3560_set_ctrl(ctrl, LM3560_LED1);
 }

 static int lm3560_led0_get_ctrl(struct v4l2_ctrl *ctrl)
 {
 	return lm3560_get_ctrl(ctrl, LM3560_LED0);
 }

 static int lm3560_led0_set_ctrl(struct v4l2_ctrl *ctrl)
 {
 	return lm3560_set_ctrl(ctrl, LM3560_LED0);
 }

 static const struct v4l2_ctrl_ops lm3560_led_ctrl_ops[LM3560_LED_MAX] = {
 	[LM3560_LED0] = {
 			 .g_volatile_ctrl = lm3560_led0_get_ctrl,
 			 .s_ctrl = lm3560_led0_set_ctrl,
 			 },
 	[LM3560_LED1] = {
 			 .g_volatile_ctrl = lm3560_led1_get_ctrl,
 			 .s_ctrl = lm3560_led1_set_ctrl,
 			 }
 };

 static int lm3560_init_controls(struct lm3560_flash *flash,
 				enum lm3560_led_id led_no)
 {
 	struct v4l2_ctrl *fault;
 	u32 max_flash_brt = flash->pdata->max_flash_brt[led_no];
 	u32 max_torch_brt = flash->pdata->max_torch_brt[led_no];
 	struct v4l2_ctrl_handler *hdl = &flash->ctrls_led[led_no];
 	const struct v4l2_ctrl_ops *ops = &lm3560_led_ctrl_ops[led_no];

 	v4l2_ctrl_handler_init(hdl, 8);
 	/* flash mode */
 	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_LED_MODE,
 			       V4L2_FLASH_LED_MODE_TORCH, ~0x7,
 			       V4L2_FLASH_LED_MODE_NONE);
 	flash->led_mode = V4L2_FLASH_LED_MODE_NONE;

 	/* flash source */
 	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_STROBE_SOURCE,
 			       0x1, ~0x3, V4L2_FLASH_STROBE_SOURCE_SOFTWARE);

 	/* flash strobe */
 	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
 	/* flash strobe stop */
 	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);

 	/* flash strobe timeout */
 	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TIMEOUT,
 			  LM3560_FLASH_TOUT_MIN,
 			  flash->pdata->max_flash_timeout,
 			  LM3560_FLASH_TOUT_STEP,
 			  flash->pdata->max_flash_timeout);

 	/* flash brt */
 	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
 			  LM3560_FLASH_BRT_MIN, max_flash_brt,
 			  LM3560_FLASH_BRT_STEP, max_flash_brt);

 	/* torch brt */
 	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
 			  LM3560_TORCH_BRT_MIN, max_torch_brt,
 			  LM3560_TORCH_BRT_STEP, max_torch_brt);

 	/* fault */
 	fault = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_FAULT, 0,
 				  V4L2_FLASH_FAULT_OVER_VOLTAGE
 				  | V4L2_FLASH_FAULT_OVER_TEMPERATURE
 				  | V4L2_FLASH_FAULT_SHORT_CIRCUIT
 				  | V4L2_FLASH_FAULT_TIMEOUT, 0, 0);
 	if (fault != NULL)
 		fault->flags |= V4L2_CTRL_FLAG_VOLATILE;

 	if (hdl->error)
 		return hdl->error;

 	flash->subdev_led[led_no].ctrl_handler = hdl;
 	return 0;
 }

 /* initialize device */
 static const struct v4l2_subdev_ops lm3560_ops = {
 	.core = NULL,
 };

 static const struct regmap_config lm3560_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = 0xFF,
 };

 static int lm3560_subdev_init(struct lm3560_flash *flash,
 			      enum lm3560_led_id led_no, char *led_name)
 {
 	struct i2c_client *client = to_i2c_client(flash->dev);
 	int rval;

 	v4l2_i2c_subdev_init(&flash->subdev_led[led_no], client, &lm3560_ops);
 	flash->subdev_led[led_no].flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 	strcpy(flash->subdev_led[led_no].name, led_name);
 	rval = lm3560_init_controls(flash, led_no);
 	if (rval)
 		goto err_out;
 	rval = media_entity_init(&flash->subdev_led[led_no].entity, 0, NULL, 0);
 	if (rval < 0)
 		goto err_out;
 	flash->subdev_led[led_no].entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;

 	return rval;

 err_out:
 	v4l2_ctrl_handler_free(&flash->ctrls_led[led_no]);
 	return rval;
 }

 static int lm3560_init_device(struct lm3560_flash *flash)
 {
 	int rval;
 	unsigned int reg_val;

 	/* set peak current */
 	rval = regmap_update_bits(flash->regmap,
 				  REG_FLASH_TOUT, 0x60, flash->pdata->peak);
 	if (rval < 0)
 		return rval;
 	/* output disable */
 	flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
 	rval = lm3560_mode_ctrl(flash);
 	if (rval < 0)
 		return rval;
 	/* Reset faults */
 	rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
 	return rval;
 }

 static int lm3560_probe(struct i2c_client *client,
 			const struct i2c_device_id *devid)
 {
 	struct lm3560_flash *flash;
 	struct lm3560_platform_data *pdata = dev_get_platdata(&client->dev);
 	int rval;

 	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
 	if (flash == NULL)
 		return -ENOMEM;

 	flash->regmap = devm_regmap_init_i2c(client, &lm3560_regmap);
 	if (IS_ERR(flash->regmap)) {
 		rval = PTR_ERR(flash->regmap);
 		return rval;
 	}

 	/* if there is no platform data, use chip default value */
 	if (pdata == NULL) {
 		pdata =
 		    kzalloc(sizeof(struct lm3560_platform_data), GFP_KERNEL);
 		if (pdata == NULL)
 			return -ENODEV;
 		pdata->peak = LM3560_PEAK_3600mA;
 		pdata->max_flash_timeout = LM3560_FLASH_TOUT_MAX;
 		/* led 1 */
 		pdata->max_flash_brt[LM3560_LED0] = LM3560_FLASH_BRT_MAX;
 		pdata->max_torch_brt[LM3560_LED0] = LM3560_TORCH_BRT_MAX;
 		/* led 2 */
 		pdata->max_flash_brt[LM3560_LED1] = LM3560_FLASH_BRT_MAX;
 		pdata->max_torch_brt[LM3560_LED1] = LM3560_TORCH_BRT_MAX;
 	}
 	flash->pdata = pdata;
 	flash->dev = &client->dev;
 	mutex_init(&flash->lock);

 	rval = lm3560_subdev_init(flash, LM3560_LED0, "lm3560-led0");
 	if (rval < 0)
 		return rval;

 	rval = lm3560_subdev_init(flash, LM3560_LED1, "lm3560-led1");
 	if (rval < 0)
 		return rval;

 	rval = lm3560_init_device(flash);
 	if (rval < 0)
 		return rval;

 	return 0;
 }

 static int lm3560_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 	struct lm3560_flash *flash = container_of(subdev, struct lm3560_flash,
 						  subdev_led[LM3560_LED_MAX]);
 	unsigned int i;

 	for (i = LM3560_LED0; i < LM3560_LED_MAX; i++) {
 		v4l2_device_unregister_subdev(&flash->subdev_led[i]);
 		v4l2_ctrl_handler_free(&flash->ctrls_led[i]);
 		media_entity_cleanup(&flash->subdev_led[i].entity);
 	}

 	return 0;
 }

 static const struct i2c_device_id lm3560_id_table[] = {
 	{LM3560_NAME, 0},
 	{}
 };

 MODULE_DEVICE_TABLE(i2c, lm3560_id_table);

 static struct i2c_driver lm3560_i2c_driver = {
 	.driver = {
 		   .name = LM3560_NAME,
 		   .pm = NULL,
 		   },
 	.probe = lm3560_probe,
 	.remove = lm3560_remove,
 	.id_table = lm3560_id_table,
 };

 module_i2c_driver(lm3560_i2c_driver);

 MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
 MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
 MODULE_DESCRIPTION("Texas Instruments LM3560 LED flash driver");
 MODULE_LICENSE("GPL");
	/*
	* drivers/media/i2c/lm3560.c
	* General device driver for TI lm3560, FLASH LED Driver
	*
	* Copyright (C) 2013 Texas Instruments
	*
	* Contact: Daniel Jeong <gshark.jeong@gmail.com>
	* Ldd-Mlp <ldd-mlp@list.ti.com>
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#include <linux/delay.h>
	#include <linux/module.h>
	#include <linux/i2c.h>
	#include <linux/slab.h>
	#include <linux/mutex.h>
	#include <linux/regmap.h>
	#include <linux/videodev2.h>
	#include <media/lm3560.h>
	#include <media/v4l2-ctrls.h>
	#include <media/v4l2-device.h>

	/* registers definitions */
	#define REG_ENABLE 0x10
	#define REG_TORCH_BR 0xa0
	#define REG_FLASH_BR 0xb0
	#define REG_FLASH_TOUT 0xc0
	#define REG_FLAG 0xd0
	#define REG_CONFIG1 0xe0

	/* Fault Mask */
	#define FAULT_TIMEOUT (1<<0)
	#define FAULT_OVERTEMP (1<<1)
	#define FAULT_SHORT_CIRCUIT (1<<2)

	enum led_enable {
	MODE_SHDN = 0x0,
	MODE_TORCH = 0x2,
	MODE_FLASH = 0x3,
	};

	/* struct lm3560_flash
	*
	* @pdata: platform data
	* @regmap: reg. map for i2c
	* @lock: muxtex for serial access.
	* @led_mode: V4L2 LED mode
	* @ctrls_led: V4L2 contols
	* @subdev_led: V4L2 subdev
	*/
	struct lm3560_flash {
	struct device *dev;
	struct lm3560_platform_data *pdata;
	struct regmap *regmap;
	struct mutex lock;

	enum v4l2_flash_led_mode led_mode;
	struct v4l2_ctrl_handler ctrls_led[LM3560_LED_MAX];
	struct v4l2_subdev subdev_led[LM3560_LED_MAX];
	};

	#define to_lm3560_flash(_ctrl, _no) \
	container_of(_ctrl->handler, struct lm3560_flash, ctrls_led[_no])

	/* enable mode control */
	static int lm3560_mode_ctrl(struct lm3560_flash *flash)
	{
	int rval = -EINVAL;

	switch (flash->led_mode) {
	case V4L2_FLASH_LED_MODE_NONE:
	rval = regmap_update_bits(flash->regmap,
	REG_ENABLE, 0x03, MODE_SHDN);
	break;
	case V4L2_FLASH_LED_MODE_TORCH:
	rval = regmap_update_bits(flash->regmap,
	REG_ENABLE, 0x03, MODE_TORCH);
	break;
	case V4L2_FLASH_LED_MODE_FLASH:
	rval = regmap_update_bits(flash->regmap,
	REG_ENABLE, 0x03, MODE_FLASH);
	break;
	}
	return rval;
	}

	/* led1/2 enable/disable */
	static int lm3560_enable_ctrl(struct lm3560_flash *flash,
	enum lm3560_led_id led_no, bool on)
	{
	int rval;

	if (led_no == LM3560_LED0) {
	if (on == true)
	rval = regmap_update_bits(flash->regmap,
	REG_ENABLE, 0x08, 0x08);
	else
	rval = regmap_update_bits(flash->regmap,
	REG_ENABLE, 0x08, 0x00);
	} else {
	if (on == true)
	rval = regmap_update_bits(flash->regmap,
	REG_ENABLE, 0x10, 0x10);
	else
	rval = regmap_update_bits(flash->regmap,
	REG_ENABLE, 0x10, 0x00);
	}
	return rval;
	}

	/* torch1/2 brightness control */
	static int lm3560_torch_brt_ctrl(struct lm3560_flash *flash,
	enum lm3560_led_id led_no, unsigned int brt)
	{
	int rval;
	u8 br_bits;

	if (brt < LM3560_TORCH_BRT_MIN)
	return lm3560_enable_ctrl(flash, led_no, false);
	else
	rval = lm3560_enable_ctrl(flash, led_no, true);

	br_bits = LM3560_TORCH_BRT_uA_TO_REG(brt);
	if (led_no == LM3560_LED0)
	rval = regmap_update_bits(flash->regmap,
	REG_TORCH_BR, 0x07, br_bits);
	else
	rval = regmap_update_bits(flash->regmap,
	REG_TORCH_BR, 0x38, br_bits << 3);

	return rval;
	}

	/* flash1/2 brightness control */
	static int lm3560_flash_brt_ctrl(struct lm3560_flash *flash,
	enum lm3560_led_id led_no, unsigned int brt)
	{
	int rval;
	u8 br_bits;

	if (brt < LM3560_FLASH_BRT_MIN)
	return lm3560_enable_ctrl(flash, led_no, false);
	else
	rval = lm3560_enable_ctrl(flash, led_no, true);

	br_bits = LM3560_FLASH_BRT_uA_TO_REG(brt);
	if (led_no == LM3560_LED0)
	rval = regmap_update_bits(flash->regmap,
	REG_FLASH_BR, 0x0f, br_bits);
	else
	rval = regmap_update_bits(flash->regmap,
	REG_FLASH_BR, 0xf0, br_bits << 4);

	return rval;
	}

	/* V4L2 controls */
	static int lm3560_get_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
	{
	struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);

	mutex_lock(&flash->lock);

	if (ctrl->id == V4L2_CID_FLASH_FAULT) {
	int rval;
	s32 fault = 0;
	unsigned int reg_val;
	rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
	if (rval < 0)
	return rval;
	if (rval & FAULT_SHORT_CIRCUIT)
	fault \|= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
	if (rval & FAULT_OVERTEMP)
	fault \|= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
	if (rval & FAULT_TIMEOUT)
	fault \|= V4L2_FLASH_FAULT_TIMEOUT;
	ctrl->cur.val = fault;
	return 0;
	}

	mutex_unlock(&flash->lock);
	return -EINVAL;
	}

	static int lm3560_set_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
	{
	struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);
	u8 tout_bits;
	int rval = -EINVAL;

	mutex_lock(&flash->lock);

	switch (ctrl->id) {
	case V4L2_CID_FLASH_LED_MODE:
	flash->led_mode = ctrl->val;
	if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
	rval = lm3560_mode_ctrl(flash);
	break;

	case V4L2_CID_FLASH_STROBE_SOURCE:
	rval = regmap_update_bits(flash->regmap,
	REG_CONFIG1, 0x04, (ctrl->val) << 2);
	if (rval < 0)
	goto err_out;
	break;

	case V4L2_CID_FLASH_STROBE:
	if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
	return -EBUSY;
	flash->led_mode = V4L2_FLASH_LED_MODE_FLASH;
	rval = lm3560_mode_ctrl(flash);
	break;

	case V4L2_CID_FLASH_STROBE_STOP:
	if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
	return -EBUSY;
	flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
	rval = lm3560_mode_ctrl(flash);
	break;

	case V4L2_CID_FLASH_TIMEOUT:
	tout_bits = LM3560_FLASH_TOUT_ms_TO_REG(ctrl->val);
	rval = regmap_update_bits(flash->regmap,
	REG_FLASH_TOUT, 0x1f, tout_bits);
	break;

	case V4L2_CID_FLASH_INTENSITY:
	rval = lm3560_flash_brt_ctrl(flash, led_no, ctrl->val);
	break;

	case V4L2_CID_FLASH_TORCH_INTENSITY:
	rval = lm3560_torch_brt_ctrl(flash, led_no, ctrl->val);
	break;
	}

	mutex_unlock(&flash->lock);
	err_out:
	return rval;
	}

	static int lm3560_led1_get_ctrl(struct v4l2_ctrl *ctrl)
	{
	return lm3560_get_ctrl(ctrl, LM3560_LED1);
	}

	static int lm3560_led1_set_ctrl(struct v4l2_ctrl *ctrl)
	{
	return lm3560_set_ctrl(ctrl, LM3560_LED1);
	}

	static int lm3560_led0_get_ctrl(struct v4l2_ctrl *ctrl)
	{
	return lm3560_get_ctrl(ctrl, LM3560_LED0);
	}

	static int lm3560_led0_set_ctrl(struct v4l2_ctrl *ctrl)
	{
	return lm3560_set_ctrl(ctrl, LM3560_LED0);
	}

	static const struct v4l2_ctrl_ops lm3560_led_ctrl_ops[LM3560_LED_MAX] = {
	[LM3560_LED0] = {
	.g_volatile_ctrl = lm3560_led0_get_ctrl,
	.s_ctrl = lm3560_led0_set_ctrl,
	},
	[LM3560_LED1] = {
	.g_volatile_ctrl = lm3560_led1_get_ctrl,
	.s_ctrl = lm3560_led1_set_ctrl,
	}
	};

	static int lm3560_init_controls(struct lm3560_flash *flash,
	enum lm3560_led_id led_no)
	{
	struct v4l2_ctrl *fault;
	u32 max_flash_brt = flash->pdata->max_flash_brt[led_no];
	u32 max_torch_brt = flash->pdata->max_torch_brt[led_no];
	struct v4l2_ctrl_handler *hdl = &flash->ctrls_led[led_no];
	const struct v4l2_ctrl_ops *ops = &lm3560_led_ctrl_ops[led_no];

	v4l2_ctrl_handler_init(hdl, 8);
	/* flash mode */
	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_LED_MODE,
	V4L2_FLASH_LED_MODE_TORCH, ~0x7,
	V4L2_FLASH_LED_MODE_NONE);
	flash->led_mode = V4L2_FLASH_LED_MODE_NONE;

	/* flash source */
	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_STROBE_SOURCE,
	0x1, ~0x3, V4L2_FLASH_STROBE_SOURCE_SOFTWARE);

	/* flash strobe */
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
	/* flash strobe stop */
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);

	/* flash strobe timeout */
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TIMEOUT,
	LM3560_FLASH_TOUT_MIN,
	flash->pdata->max_flash_timeout,
	LM3560_FLASH_TOUT_STEP,
	flash->pdata->max_flash_timeout);

	/* flash brt */
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
	LM3560_FLASH_BRT_MIN, max_flash_brt,
	LM3560_FLASH_BRT_STEP, max_flash_brt);

	/* torch brt */
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
	LM3560_TORCH_BRT_MIN, max_torch_brt,
	LM3560_TORCH_BRT_STEP, max_torch_brt);

	/* fault */
	fault = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_FAULT, 0,
	V4L2_FLASH_FAULT_OVER_VOLTAGE
	\| V4L2_FLASH_FAULT_OVER_TEMPERATURE
	\| V4L2_FLASH_FAULT_SHORT_CIRCUIT
	\| V4L2_FLASH_FAULT_TIMEOUT, 0, 0);
	if (fault != NULL)
	fault->flags \|= V4L2_CTRL_FLAG_VOLATILE;

	if (hdl->error)
	return hdl->error;

	flash->subdev_led[led_no].ctrl_handler = hdl;
	return 0;
	}

	/* initialize device */
	static const struct v4l2_subdev_ops lm3560_ops = {
	.core = NULL,
	};

	static const struct regmap_config lm3560_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0xFF,
	};

	static int lm3560_subdev_init(struct lm3560_flash *flash,
	enum lm3560_led_id led_no, char *led_name)
	{
	struct i2c_client *client = to_i2c_client(flash->dev);
	int rval;

	v4l2_i2c_subdev_init(&flash->subdev_led[led_no], client, &lm3560_ops);
	flash->subdev_led[led_no].flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;
	strcpy(flash->subdev_led[led_no].name, led_name);
	rval = lm3560_init_controls(flash, led_no);
	if (rval)
	goto err_out;
	rval = media_entity_init(&flash->subdev_led[led_no].entity, 0, NULL, 0);
	if (rval < 0)
	goto err_out;
	flash->subdev_led[led_no].entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;

	return rval;

	err_out:
	v4l2_ctrl_handler_free(&flash->ctrls_led[led_no]);
	return rval;
	}

	static int lm3560_init_device(struct lm3560_flash *flash)
	{
	int rval;
	unsigned int reg_val;

	/* set peak current */
	rval = regmap_update_bits(flash->regmap,
	REG_FLASH_TOUT, 0x60, flash->pdata->peak);
	if (rval < 0)
	return rval;
	/* output disable */
	flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
	rval = lm3560_mode_ctrl(flash);
	if (rval < 0)
	return rval;
	/* Reset faults */
	rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
	return rval;
	}

	static int lm3560_probe(struct i2c_client *client,
	const struct i2c_device_id *devid)
	{
	struct lm3560_flash *flash;
	struct lm3560_platform_data *pdata = dev_get_platdata(&client->dev);
	int rval;

	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
	if (flash == NULL)
	return -ENOMEM;

	flash->regmap = devm_regmap_init_i2c(client, &lm3560_regmap);
	if (IS_ERR(flash->regmap)) {
	rval = PTR_ERR(flash->regmap);
	return rval;
	}

	/* if there is no platform data, use chip default value */
	if (pdata == NULL) {
	pdata =
	kzalloc(sizeof(struct lm3560_platform_data), GFP_KERNEL);
	if (pdata == NULL)
	return -ENODEV;
	pdata->peak = LM3560_PEAK_3600mA;
	pdata->max_flash_timeout = LM3560_FLASH_TOUT_MAX;
	/* led 1 */
	pdata->max_flash_brt[LM3560_LED0] = LM3560_FLASH_BRT_MAX;
	pdata->max_torch_brt[LM3560_LED0] = LM3560_TORCH_BRT_MAX;
	/* led 2 */
	pdata->max_flash_brt[LM3560_LED1] = LM3560_FLASH_BRT_MAX;
	pdata->max_torch_brt[LM3560_LED1] = LM3560_TORCH_BRT_MAX;
	}
	flash->pdata = pdata;
	flash->dev = &client->dev;
	mutex_init(&flash->lock);

	rval = lm3560_subdev_init(flash, LM3560_LED0, "lm3560-led0");
	if (rval < 0)
	return rval;

	rval = lm3560_subdev_init(flash, LM3560_LED1, "lm3560-led1");
	if (rval < 0)
	return rval;

	rval = lm3560_init_device(flash);
	if (rval < 0)
	return rval;

	return 0;
	}

	static int lm3560_remove(struct i2c_client *client)
	{
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct lm3560_flash *flash = container_of(subdev, struct lm3560_flash,
	subdev_led[LM3560_LED_MAX]);
	unsigned int i;

	for (i = LM3560_LED0; i < LM3560_LED_MAX; i++) {
	v4l2_device_unregister_subdev(&flash->subdev_led[i]);
	v4l2_ctrl_handler_free(&flash->ctrls_led[i]);
	media_entity_cleanup(&flash->subdev_led[i].entity);
	}

	return 0;
	}

	static const struct i2c_device_id lm3560_id_table[] = {
	{LM3560_NAME, 0},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, lm3560_id_table);

	static struct i2c_driver lm3560_i2c_driver = {
	.driver = {
	.name = LM3560_NAME,
	.pm = NULL,
	},
	.probe = lm3560_probe,
	.remove = lm3560_remove,
	.id_table = lm3560_id_table,
	};

	module_i2c_driver(lm3560_i2c_driver);

	MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
	MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
	MODULE_DESCRIPTION("Texas Instruments LM3560 LED flash driver");
	MODULE_LICENSE("GPL");