[mirror_ubuntu-jammy-kernel.git] / drivers / media / i2c / lm3646.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * drivers/media/i2c/lm3646.c
 * General device driver for TI lm3646, Dual FLASH LED Driver
 *
 * Copyright (C) 2014 Texas Instruments
 *
 * Contact: Daniel Jeong <gshark.jeong@gmail.com>
 *			Ldd-Mlp <ldd-mlp@list.ti.com>
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/videodev2.h>
#include <media/i2c/lm3646.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>

/* registers definitions */
#define REG_ENABLE		0x01
#define REG_TORCH_BR	0x05
#define REG_FLASH_BR	0x05
#define REG_FLASH_TOUT	0x04
#define REG_FLAG		0x08
#define REG_STROBE_SRC	0x06
#define REG_LED1_FLASH_BR 0x06
#define REG_LED1_TORCH_BR 0x07

#define MASK_ENABLE		0x03
#define MASK_TORCH_BR	0x70
#define MASK_FLASH_BR	0x0F
#define MASK_FLASH_TOUT	0x07
#define MASK_FLAG		0xFF
#define MASK_STROBE_SRC	0x80

/* Fault Mask */
#define FAULT_TIMEOUT	(1<<0)
#define FAULT_SHORT_CIRCUIT	(1<<1)
#define FAULT_UVLO		(1<<2)
#define FAULT_IVFM		(1<<3)
#define FAULT_OCP		(1<<4)
#define FAULT_OVERTEMP	(1<<5)
#define FAULT_NTC_TRIP	(1<<6)
#define FAULT_OVP		(1<<7)

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

/*
 * struct lm3646_flash
 *
 * @pdata: platform data
 * @regmap: reg. map for i2c
 * @lock: muxtex for serial access.
 * @led_mode: V4L2 LED mode
 * @ctrls_led: V4L2 controls
 * @subdev_led: V4L2 subdev
 * @mode_reg : mode register value
 */
struct lm3646_flash {
	struct device *dev;
	struct lm3646_platform_data *pdata;
	struct regmap *regmap;

	struct v4l2_ctrl_handler ctrls_led;
	struct v4l2_subdev subdev_led;

	u8 mode_reg;
};

#define to_lm3646_flash(_ctrl)	\
	container_of(_ctrl->handler, struct lm3646_flash, ctrls_led)

/* enable mode control */
static int lm3646_mode_ctrl(struct lm3646_flash *flash,
			    enum v4l2_flash_led_mode led_mode)
{
	switch (led_mode) {
	case V4L2_FLASH_LED_MODE_NONE:
		return regmap_write(flash->regmap,
				    REG_ENABLE, flash->mode_reg | MODE_SHDN);
	case V4L2_FLASH_LED_MODE_TORCH:
		return regmap_write(flash->regmap,
				    REG_ENABLE, flash->mode_reg | MODE_TORCH);
	case V4L2_FLASH_LED_MODE_FLASH:
		return regmap_write(flash->regmap,
				    REG_ENABLE, flash->mode_reg | MODE_FLASH);
	}
	return -EINVAL;
}

/* V4L2 controls  */
static int lm3646_get_ctrl(struct v4l2_ctrl *ctrl)
{
	struct lm3646_flash *flash = to_lm3646_flash(ctrl);
	unsigned int reg_val;
	int rval;

	if (ctrl->id != V4L2_CID_FLASH_FAULT)
		return -EINVAL;

	rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
	if (rval < 0)
		return rval;

	ctrl->val = 0;
	if (reg_val & FAULT_TIMEOUT)
		ctrl->val |= V4L2_FLASH_FAULT_TIMEOUT;
	if (reg_val & FAULT_SHORT_CIRCUIT)
		ctrl->val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
	if (reg_val & FAULT_UVLO)
		ctrl->val |= V4L2_FLASH_FAULT_UNDER_VOLTAGE;
	if (reg_val & FAULT_IVFM)
		ctrl->val |= V4L2_FLASH_FAULT_INPUT_VOLTAGE;
	if (reg_val & FAULT_OCP)
		ctrl->val |= V4L2_FLASH_FAULT_OVER_CURRENT;
	if (reg_val & FAULT_OVERTEMP)
		ctrl->val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
	if (reg_val & FAULT_NTC_TRIP)
		ctrl->val |= V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE;
	if (reg_val & FAULT_OVP)
		ctrl->val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;

	return 0;
}

static int lm3646_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct lm3646_flash *flash = to_lm3646_flash(ctrl);
	unsigned int reg_val;
	int rval = -EINVAL;

	switch (ctrl->id) {
	case V4L2_CID_FLASH_LED_MODE:

		if (ctrl->val != V4L2_FLASH_LED_MODE_FLASH)
			return lm3646_mode_ctrl(flash, ctrl->val);
		/* switch to SHDN mode before flash strobe on */
		return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);

	case V4L2_CID_FLASH_STROBE_SOURCE:
		return regmap_update_bits(flash->regmap,
					  REG_STROBE_SRC, MASK_STROBE_SRC,
					  (ctrl->val) << 7);

	case V4L2_CID_FLASH_STROBE:

		/* read and check current mode of chip to start flash */
		rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
		if (rval < 0 || ((reg_val & MASK_ENABLE) != MODE_SHDN))
			return rval;
		/* flash on */
		return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_FLASH);

	case V4L2_CID_FLASH_STROBE_STOP:

		/*
		 * flash mode will be turned automatically
		 * from FLASH mode to SHDN mode after flash duration timeout
		 * read and check current mode of chip to stop flash
		 */
		rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
		if (rval < 0)
			return rval;
		if ((reg_val & MASK_ENABLE) == MODE_FLASH)
			return lm3646_mode_ctrl(flash,
						V4L2_FLASH_LED_MODE_NONE);
		return rval;

	case V4L2_CID_FLASH_TIMEOUT:
		return regmap_update_bits(flash->regmap,
					  REG_FLASH_TOUT, MASK_FLASH_TOUT,
					  LM3646_FLASH_TOUT_ms_TO_REG
					  (ctrl->val));

	case V4L2_CID_FLASH_INTENSITY:
		return regmap_update_bits(flash->regmap,
					  REG_FLASH_BR, MASK_FLASH_BR,
					  LM3646_TOTAL_FLASH_BRT_uA_TO_REG
					  (ctrl->val));

	case V4L2_CID_FLASH_TORCH_INTENSITY:
		return regmap_update_bits(flash->regmap,
					  REG_TORCH_BR, MASK_TORCH_BR,
					  LM3646_TOTAL_TORCH_BRT_uA_TO_REG
					  (ctrl->val) << 4);
	}

	return -EINVAL;
}

static const struct v4l2_ctrl_ops lm3646_led_ctrl_ops = {
	.g_volatile_ctrl = lm3646_get_ctrl,
	.s_ctrl = lm3646_set_ctrl,
};

static int lm3646_init_controls(struct lm3646_flash *flash)
{
	struct v4l2_ctrl *fault;
	struct v4l2_ctrl_handler *hdl = &flash->ctrls_led;
	const struct v4l2_ctrl_ops *ops = &lm3646_led_ctrl_ops;

	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 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,
			  LM3646_FLASH_TOUT_MIN,
			  LM3646_FLASH_TOUT_MAX,
			  LM3646_FLASH_TOUT_STEP, flash->pdata->flash_timeout);

	/* max flash current */
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
			  LM3646_TOTAL_FLASH_BRT_MIN,
			  LM3646_TOTAL_FLASH_BRT_MAX,
			  LM3646_TOTAL_FLASH_BRT_STEP,
			  LM3646_TOTAL_FLASH_BRT_MAX);

	/* max torch current */
	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
			  LM3646_TOTAL_TORCH_BRT_MIN,
			  LM3646_TOTAL_TORCH_BRT_MAX,
			  LM3646_TOTAL_TORCH_BRT_STEP,
			  LM3646_TOTAL_TORCH_BRT_MAX);

	/* 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.ctrl_handler = hdl;
	return 0;
}

/* initialize device */
static const struct v4l2_subdev_ops lm3646_ops = {
	.core = NULL,
};

static const struct regmap_config lm3646_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0xFF,
};

static int lm3646_subdev_init(struct lm3646_flash *flash)
{
	struct i2c_client *client = to_i2c_client(flash->dev);
	int rval;

	v4l2_i2c_subdev_init(&flash->subdev_led, client, &lm3646_ops);
	flash->subdev_led.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	strscpy(flash->subdev_led.name, LM3646_NAME,
		sizeof(flash->subdev_led.name));
	rval = lm3646_init_controls(flash);
	if (rval)
		goto err_out;
	rval = media_entity_pads_init(&flash->subdev_led.entity, 0, NULL);
	if (rval < 0)
		goto err_out;
	flash->subdev_led.entity.function = MEDIA_ENT_F_FLASH;
	return rval;

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

static int lm3646_init_device(struct lm3646_flash *flash)
{
	unsigned int reg_val;
	int rval;

	/* read the value of mode register to reduce redundant i2c accesses */
	rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
	if (rval < 0)
		return rval;
	flash->mode_reg = reg_val & 0xfc;

	/* output disable */
	rval = lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
	if (rval < 0)
		return rval;

	/*
	 * LED1 flash current setting
	 * LED2 flash current = Total(Max) flash current - LED1 flash current
	 */
	rval = regmap_update_bits(flash->regmap,
				  REG_LED1_FLASH_BR, 0x7F,
				  LM3646_LED1_FLASH_BRT_uA_TO_REG
				  (flash->pdata->led1_flash_brt));

	if (rval < 0)
		return rval;

	/*
	 * LED1 torch current setting
	 * LED2 torch current = Total(Max) torch current - LED1 torch current
	 */
	rval = regmap_update_bits(flash->regmap,
				  REG_LED1_TORCH_BR, 0x7F,
				  LM3646_LED1_TORCH_BRT_uA_TO_REG
				  (flash->pdata->led1_torch_brt));
	if (rval < 0)
		return rval;

	/* Reset flag register */
	return regmap_read(flash->regmap, REG_FLAG, &reg_val);
}

static int lm3646_probe(struct i2c_client *client,
			const struct i2c_device_id *devid)
{
	struct lm3646_flash *flash;
	struct lm3646_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, &lm3646_regmap);
	if (IS_ERR(flash->regmap))
		return PTR_ERR(flash->regmap);

	/* check device tree if there is no platform data */
	if (pdata == NULL) {
		pdata = devm_kzalloc(&client->dev,
				     sizeof(struct lm3646_platform_data),
				     GFP_KERNEL);
		if (pdata == NULL)
			return -ENOMEM;
		/* use default data in case of no platform data */
		pdata->flash_timeout = LM3646_FLASH_TOUT_MAX;
		pdata->led1_torch_brt = LM3646_LED1_TORCH_BRT_MAX;
		pdata->led1_flash_brt = LM3646_LED1_FLASH_BRT_MAX;
	}
	flash->pdata = pdata;
	flash->dev = &client->dev;

	rval = lm3646_subdev_init(flash);
	if (rval < 0)
		return rval;

	rval = lm3646_init_device(flash);
	if (rval < 0)
		return rval;

	i2c_set_clientdata(client, flash);

	return 0;
}

static int lm3646_remove(struct i2c_client *client)
{
	struct lm3646_flash *flash = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(&flash->subdev_led);
	v4l2_ctrl_handler_free(&flash->ctrls_led);
	media_entity_cleanup(&flash->subdev_led.entity);

	return 0;
}

static const struct i2c_device_id lm3646_id_table[] = {
	{LM3646_NAME, 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, lm3646_id_table);

static struct i2c_driver lm3646_i2c_driver = {
	.driver = {
		   .name = LM3646_NAME,
		   },
	.probe = lm3646_probe,
	.remove = lm3646_remove,
	.id_table = lm3646_id_table,
};

module_i2c_driver(lm3646_i2c_driver);

MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
MODULE_DESCRIPTION("Texas Instruments LM3646 Dual Flash LED driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
dc76df5d DJ	2	/*
	3	* drivers/media/i2c/lm3646.c
	4	* General device driver for TI lm3646, Dual FLASH LED Driver
	5	*
	6	* Copyright (C) 2014 Texas Instruments
	7	*
	8	* Contact: Daniel Jeong <gshark.jeong@gmail.com>
	9	* Ldd-Mlp <ldd-mlp@list.ti.com>
dc76df5d DJ	10	*/
	11
	12	#include <linux/delay.h>
	13	#include <linux/i2c.h>
	14	#include <linux/module.h>
	15	#include <linux/slab.h>
	16	#include <linux/regmap.h>
	17	#include <linux/videodev2.h>
b5dcee22	18	#include <media/i2c/lm3646.h>
dc76df5d DJ	19	#include <media/v4l2-ctrls.h>
	20	#include <media/v4l2-device.h>
	21
	22	/* registers definitions */
	23	#define REG_ENABLE 0x01
	24	#define REG_TORCH_BR 0x05
	25	#define REG_FLASH_BR 0x05
	26	#define REG_FLASH_TOUT 0x04
	27	#define REG_FLAG 0x08
	28	#define REG_STROBE_SRC 0x06
	29	#define REG_LED1_FLASH_BR 0x06
	30	#define REG_LED1_TORCH_BR 0x07
	31
	32	#define MASK_ENABLE 0x03
	33	#define MASK_TORCH_BR 0x70
	34	#define MASK_FLASH_BR 0x0F
	35	#define MASK_FLASH_TOUT 0x07
	36	#define MASK_FLAG 0xFF
	37	#define MASK_STROBE_SRC 0x80
	38
	39	/* Fault Mask */
	40	#define FAULT_TIMEOUT (1<<0)
	41	#define FAULT_SHORT_CIRCUIT (1<<1)
	42	#define FAULT_UVLO (1<<2)
	43	#define FAULT_IVFM (1<<3)
	44	#define FAULT_OCP (1<<4)
	45	#define FAULT_OVERTEMP (1<<5)
	46	#define FAULT_NTC_TRIP (1<<6)
	47	#define FAULT_OVP (1<<7)
	48
	49	enum led_mode {
	50	MODE_SHDN = 0x0,
	51	MODE_TORCH = 0x2,
	52	MODE_FLASH = 0x3,
	53	};
	54
	55	/*
	56	* struct lm3646_flash
	57	*
	58	* @pdata: platform data
	59	* @regmap: reg. map for i2c
	60	* @lock: muxtex for serial access.
	61	* @led_mode: V4L2 LED mode
f8a7647d	62	* @ctrls_led: V4L2 controls
dc76df5d DJ	63	* @subdev_led: V4L2 subdev
	64	* @mode_reg : mode register value
	65	*/
	66	struct lm3646_flash {
	67	struct device *dev;
	68	struct lm3646_platform_data *pdata;
	69	struct regmap *regmap;
	70
	71	struct v4l2_ctrl_handler ctrls_led;
	72	struct v4l2_subdev subdev_led;
	73
	74	u8 mode_reg;
	75	};
	76
	77	#define to_lm3646_flash(_ctrl) \
	78	container_of(_ctrl->handler, struct lm3646_flash, ctrls_led)
	79
	80	/* enable mode control */
	81	static int lm3646_mode_ctrl(struct lm3646_flash *flash,
	82	enum v4l2_flash_led_mode led_mode)
	83	{
	84	switch (led_mode) {
	85	case V4L2_FLASH_LED_MODE_NONE:
	86	return regmap_write(flash->regmap,
	87	REG_ENABLE, flash->mode_reg \| MODE_SHDN);
	88	case V4L2_FLASH_LED_MODE_TORCH:
	89	return regmap_write(flash->regmap,
	90	REG_ENABLE, flash->mode_reg \| MODE_TORCH);
	91	case V4L2_FLASH_LED_MODE_FLASH:
	92	return regmap_write(flash->regmap,
	93	REG_ENABLE, flash->mode_reg \| MODE_FLASH);
	94	}
	95	return -EINVAL;
	96	}
	97
	98	/* V4L2 controls */
	99	static int lm3646_get_ctrl(struct v4l2_ctrl *ctrl)
	100	{
	101	struct lm3646_flash *flash = to_lm3646_flash(ctrl);
	102	unsigned int reg_val;
	103	int rval;
	104
	105	if (ctrl->id != V4L2_CID_FLASH_FAULT)
	106	return -EINVAL;
	107
	108	rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
	109	if (rval < 0)
	110	return rval;
	111
	112	ctrl->val = 0;
	113	if (reg_val & FAULT_TIMEOUT)
	114	ctrl->val \|= V4L2_FLASH_FAULT_TIMEOUT;
	115	if (reg_val & FAULT_SHORT_CIRCUIT)
	116	ctrl->val \|= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
	117	if (reg_val & FAULT_UVLO)
	118	ctrl->val \|= V4L2_FLASH_FAULT_UNDER_VOLTAGE;
	119	if (reg_val & FAULT_IVFM)
	120	ctrl->val \|= V4L2_FLASH_FAULT_INPUT_VOLTAGE;
	121	if (reg_val & FAULT_OCP)
	122	ctrl->val \|= V4L2_FLASH_FAULT_OVER_CURRENT;
	123	if (reg_val & FAULT_OVERTEMP)
	124	ctrl->val \|= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
	125	if (reg_val & FAULT_NTC_TRIP)
	126	ctrl->val \|= V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE;
127	if (reg_val & FAULT_OVP)
128	ctrl->val \|= V4L2_FLASH_FAULT_OVER_VOLTAGE;
129
130	return 0;
131	}
132
133	static int lm3646_set_ctrl(struct v4l2_ctrl *ctrl)
134	{
135	struct lm3646_flash *flash = to_lm3646_flash(ctrl);
136	unsigned int reg_val;
137	int rval = -EINVAL;
138
139	switch (ctrl->id) {
140	case V4L2_CID_FLASH_LED_MODE:
141
142	if (ctrl->val != V4L2_FLASH_LED_MODE_FLASH)
143	return lm3646_mode_ctrl(flash, ctrl->val);
144	/* switch to SHDN mode before flash strobe on */
145	return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
146
147	case V4L2_CID_FLASH_STROBE_SOURCE:
148	return regmap_update_bits(flash->regmap,
149	REG_STROBE_SRC, MASK_STROBE_SRC,
150	(ctrl->val) << 7);
151
152	case V4L2_CID_FLASH_STROBE:
153
154	/* read and check current mode of chip to start flash */
155	rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
156	if (rval < 0 \|\| ((reg_val & MASK_ENABLE) != MODE_SHDN))
157	return rval;
158	/* flash on */
159	return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_FLASH);
160
161	case V4L2_CID_FLASH_STROBE_STOP:
162
163	/*
164	* flash mode will be turned automatically
165	* from FLASH mode to SHDN mode after flash duration timeout
166	* read and check current mode of chip to stop flash
167	*/
168	rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
169	if (rval < 0)
170	return rval;
171	if ((reg_val & MASK_ENABLE) == MODE_FLASH)
172	return lm3646_mode_ctrl(flash,
173	V4L2_FLASH_LED_MODE_NONE);
174	return rval;
175
176	case V4L2_CID_FLASH_TIMEOUT:
177	return regmap_update_bits(flash->regmap,
178	REG_FLASH_TOUT, MASK_FLASH_TOUT,
179	LM3646_FLASH_TOUT_ms_TO_REG
180	(ctrl->val));
181
182	case V4L2_CID_FLASH_INTENSITY:
183	return regmap_update_bits(flash->regmap,
184	REG_FLASH_BR, MASK_FLASH_BR,
185	LM3646_TOTAL_FLASH_BRT_uA_TO_REG
186	(ctrl->val));
187
188	case V4L2_CID_FLASH_TORCH_INTENSITY:
189	return regmap_update_bits(flash->regmap,
190	REG_TORCH_BR, MASK_TORCH_BR,
191	LM3646_TOTAL_TORCH_BRT_uA_TO_REG
192	(ctrl->val) << 4);
193	}
194
195	return -EINVAL;
196	}
197
198	static const struct v4l2_ctrl_ops lm3646_led_ctrl_ops = {
199	.g_volatile_ctrl = lm3646_get_ctrl,
200	.s_ctrl = lm3646_set_ctrl,
201	};
202
203	static int lm3646_init_controls(struct lm3646_flash *flash)
204	{
205	struct v4l2_ctrl *fault;
206	struct v4l2_ctrl_handler *hdl = &flash->ctrls_led;
207	const struct v4l2_ctrl_ops *ops = &lm3646_led_ctrl_ops;
208
209	v4l2_ctrl_handler_init(hdl, 8);
210	/* flash mode */
211	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_LED_MODE,
212	V4L2_FLASH_LED_MODE_TORCH, ~0x7,
213	V4L2_FLASH_LED_MODE_NONE);
214
215	/* flash source */
216	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_STROBE_SOURCE,
217	0x1, ~0x3, V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
218
219	/* flash strobe */
220	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
221	/* flash strobe stop */
222	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
223
224	/* flash strobe timeout */
225	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TIMEOUT,
226	LM3646_FLASH_TOUT_MIN,
227	LM3646_FLASH_TOUT_MAX,
228	LM3646_FLASH_TOUT_STEP, flash->pdata->flash_timeout);
229
230	/* max flash current */
231	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
232	LM3646_TOTAL_FLASH_BRT_MIN,
233	LM3646_TOTAL_FLASH_BRT_MAX,
234	LM3646_TOTAL_FLASH_BRT_STEP,
235	LM3646_TOTAL_FLASH_BRT_MAX);
236
237	/* max torch current */
238	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
239	LM3646_TOTAL_TORCH_BRT_MIN,
240	LM3646_TOTAL_TORCH_BRT_MAX,
241	LM3646_TOTAL_TORCH_BRT_STEP,
242	LM3646_TOTAL_TORCH_BRT_MAX);
243
244	/* fault */
245	fault = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_FAULT, 0,
246	V4L2_FLASH_FAULT_OVER_VOLTAGE
247	\| V4L2_FLASH_FAULT_OVER_TEMPERATURE
248	\| V4L2_FLASH_FAULT_SHORT_CIRCUIT
249	\| V4L2_FLASH_FAULT_TIMEOUT, 0, 0);
250	if (fault != NULL)
251	fault->flags \|= V4L2_CTRL_FLAG_VOLATILE;
252
253	if (hdl->error)
254	return hdl->error;
255
256	flash->subdev_led.ctrl_handler = hdl;
257	return 0;
258	}
259
260	/* initialize device */
261	static const struct v4l2_subdev_ops lm3646_ops = {
262	.core = NULL,
263	};
264
265	static const struct regmap_config lm3646_regmap = {
266	.reg_bits = 8,
267	.val_bits = 8,
268	.max_register = 0xFF,
269	};
270
271	static int lm3646_subdev_init(struct lm3646_flash *flash)
272	{
273	struct i2c_client *client = to_i2c_client(flash->dev);
274	int rval;
275
276	v4l2_i2c_subdev_init(&flash->subdev_led, client, &lm3646_ops);
277	flash->subdev_led.flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;
cc1e6315 MCC	278	strscpy(flash->subdev_led.name, LM3646_NAME,
cc1e6315 MCC	279	sizeof(flash->subdev_led.name));
dc76df5d DJ	280	rval = lm3646_init_controls(flash);
	281	if (rval)
	282	goto err_out;
ab22e77c	283	rval = media_entity_pads_init(&flash->subdev_led.entity, 0, NULL);
dc76df5d DJ	284	if (rval < 0)
dc76df5d DJ	285	goto err_out;
4ca72efa	286	flash->subdev_led.entity.function = MEDIA_ENT_F_FLASH;
dc76df5d DJ	287	return rval;
	288
	289	err_out:
	290	v4l2_ctrl_handler_free(&flash->ctrls_led);
	291	return rval;
	292	}
	293
	294	static int lm3646_init_device(struct lm3646_flash *flash)
	295	{
	296	unsigned int reg_val;
	297	int rval;
	298
	299	/* read the value of mode register to reduce redundant i2c accesses */
	300	rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
	301	if (rval < 0)
	302	return rval;
	303	flash->mode_reg = reg_val & 0xfc;
	304
	305	/* output disable */
	306	rval = lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
	307	if (rval < 0)
	308	return rval;
	309
	310	/*
	311	* LED1 flash current setting
	312	* LED2 flash current = Total(Max) flash current - LED1 flash current
	313	*/
	314	rval = regmap_update_bits(flash->regmap,
	315	REG_LED1_FLASH_BR, 0x7F,
	316	LM3646_LED1_FLASH_BRT_uA_TO_REG
	317	(flash->pdata->led1_flash_brt));
	318
	319	if (rval < 0)
	320	return rval;
	321
	322	/*
	323	* LED1 torch current setting
	324	* LED2 torch current = Total(Max) torch current - LED1 torch current
	325	*/
	326	rval = regmap_update_bits(flash->regmap,
	327	REG_LED1_TORCH_BR, 0x7F,
	328	LM3646_LED1_TORCH_BRT_uA_TO_REG
	329	(flash->pdata->led1_torch_brt));
	330	if (rval < 0)
	331	return rval;
	332
	333	/* Reset flag register */
	334	return regmap_read(flash->regmap, REG_FLAG, &reg_val);
	335	}
	336
	337	static int lm3646_probe(struct i2c_client *client,
	338	const struct i2c_device_id *devid)
	339	{
	340	struct lm3646_flash *flash;
	341	struct lm3646_platform_data *pdata = dev_get_platdata(&client->dev);
	342	int rval;
	343
	344	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
	345	if (flash == NULL)
	346	return -ENOMEM;
	347
	348	flash->regmap = devm_regmap_init_i2c(client, &lm3646_regmap);
	349	if (IS_ERR(flash->regmap))
	350	return PTR_ERR(flash->regmap);
351
352	/* check device tree if there is no platform data */
353	if (pdata == NULL) {
354	pdata = devm_kzalloc(&client->dev,
355	sizeof(struct lm3646_platform_data),
356	GFP_KERNEL);
357	if (pdata == NULL)
358	return -ENOMEM;
359	/* use default data in case of no platform data */
360	pdata->flash_timeout = LM3646_FLASH_TOUT_MAX;
361	pdata->led1_torch_brt = LM3646_LED1_TORCH_BRT_MAX;
362	pdata->led1_flash_brt = LM3646_LED1_FLASH_BRT_MAX;
363	}
364	flash->pdata = pdata;
365	flash->dev = &client->dev;
366
367	rval = lm3646_subdev_init(flash);
368	if (rval < 0)
369	return rval;
370
371	rval = lm3646_init_device(flash);
372	if (rval < 0)
373	return rval;
374
375	i2c_set_clientdata(client, flash);
376
377	return 0;
378	}
379
380	static int lm3646_remove(struct i2c_client *client)
381	{
382	struct lm3646_flash *flash = i2c_get_clientdata(client);
383
384	v4l2_device_unregister_subdev(&flash->subdev_led);
385	v4l2_ctrl_handler_free(&flash->ctrls_led);
386	media_entity_cleanup(&flash->subdev_led.entity);
387
388	return 0;
389	}
390
391	static const struct i2c_device_id lm3646_id_table[] = {
392	{LM3646_NAME, 0},
393	{}
394	};
395
396	MODULE_DEVICE_TABLE(i2c, lm3646_id_table);
397
398	static struct i2c_driver lm3646_i2c_driver = {
399	.driver = {
400	.name = LM3646_NAME,
401	},
402	.probe = lm3646_probe,
403	.remove = lm3646_remove,
404	.id_table = lm3646_id_table,
405	};
406
407	module_i2c_driver(lm3646_i2c_driver);
408
409	MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
410	MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
411	MODULE_DESCRIPTION("Texas Instruments LM3646 Dual Flash LED driver");
412	MODULE_LICENSE("GPL");