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

/*
 * 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>
 *
 * 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/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 contols
 * @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;
	strcpy(flash->subdev_led.name, LM3646_NAME);
	rval = lm3646_init_controls(flash);
	if (rval)
		goto err_out;
	rval = media_entity_init(&flash->subdev_led.entity, 0, NULL);
	if (rval < 0)
		goto err_out;
	flash->subdev_led.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_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
dc76df5d DJ	1	/*
	2	* drivers/media/i2c/lm3646.c
	3	* General device driver for TI lm3646, Dual FLASH LED Driver
	4	*
	5	* Copyright (C) 2014 Texas Instruments
	6	*
	7	* Contact: Daniel Jeong <gshark.jeong@gmail.com>
	8	* Ldd-Mlp <ldd-mlp@list.ti.com>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* version 2 as published by the Free Software Foundation.
	13	*/
	14
	15	#include <linux/delay.h>
	16	#include <linux/i2c.h>
	17	#include <linux/module.h>
	18	#include <linux/slab.h>
	19	#include <linux/regmap.h>
	20	#include <linux/videodev2.h>
b5dcee22	21	#include <media/i2c/lm3646.h>
dc76df5d DJ	22	#include <media/v4l2-ctrls.h>
	23	#include <media/v4l2-device.h>
	24
	25	/* registers definitions */
	26	#define REG_ENABLE 0x01
	27	#define REG_TORCH_BR 0x05
	28	#define REG_FLASH_BR 0x05
	29	#define REG_FLASH_TOUT 0x04
	30	#define REG_FLAG 0x08
	31	#define REG_STROBE_SRC 0x06
	32	#define REG_LED1_FLASH_BR 0x06
	33	#define REG_LED1_TORCH_BR 0x07
	34
	35	#define MASK_ENABLE 0x03
	36	#define MASK_TORCH_BR 0x70
	37	#define MASK_FLASH_BR 0x0F
	38	#define MASK_FLASH_TOUT 0x07
	39	#define MASK_FLAG 0xFF
	40	#define MASK_STROBE_SRC 0x80
	41
	42	/* Fault Mask */
	43	#define FAULT_TIMEOUT (1<<0)
	44	#define FAULT_SHORT_CIRCUIT (1<<1)
	45	#define FAULT_UVLO (1<<2)
	46	#define FAULT_IVFM (1<<3)
	47	#define FAULT_OCP (1<<4)
	48	#define FAULT_OVERTEMP (1<<5)
	49	#define FAULT_NTC_TRIP (1<<6)
	50	#define FAULT_OVP (1<<7)
	51
	52	enum led_mode {
	53	MODE_SHDN = 0x0,
	54	MODE_TORCH = 0x2,
	55	MODE_FLASH = 0x3,
	56	};
	57
	58	/*
	59	* struct lm3646_flash
	60	*
	61	* @pdata: platform data
	62	* @regmap: reg. map for i2c
	63	* @lock: muxtex for serial access.
	64	* @led_mode: V4L2 LED mode
	65	* @ctrls_led: V4L2 contols
	66	* @subdev_led: V4L2 subdev
	67	* @mode_reg : mode register value
	68	*/
	69	struct lm3646_flash {
	70	struct device *dev;
	71	struct lm3646_platform_data *pdata;
	72	struct regmap *regmap;
	73
	74	struct v4l2_ctrl_handler ctrls_led;
	75	struct v4l2_subdev subdev_led;
	76
	77	u8 mode_reg;
	78	};
	79
	80	#define to_lm3646_flash(_ctrl) \
	81	container_of(_ctrl->handler, struct lm3646_flash, ctrls_led)
	82
	83	/* enable mode control */
	84	static int lm3646_mode_ctrl(struct lm3646_flash *flash,
	85	enum v4l2_flash_led_mode led_mode)
86	{
87	switch (led_mode) {
88	case V4L2_FLASH_LED_MODE_NONE:
89	return regmap_write(flash->regmap,
90	REG_ENABLE, flash->mode_reg \| MODE_SHDN);
91	case V4L2_FLASH_LED_MODE_TORCH:
92	return regmap_write(flash->regmap,
93	REG_ENABLE, flash->mode_reg \| MODE_TORCH);
94	case V4L2_FLASH_LED_MODE_FLASH:
95	return regmap_write(flash->regmap,
96	REG_ENABLE, flash->mode_reg \| MODE_FLASH);
97	}
98	return -EINVAL;
99	}
100
101	/* V4L2 controls */
102	static int lm3646_get_ctrl(struct v4l2_ctrl *ctrl)
103	{
104	struct lm3646_flash *flash = to_lm3646_flash(ctrl);
105	unsigned int reg_val;
106	int rval;
107
108	if (ctrl->id != V4L2_CID_FLASH_FAULT)
109	return -EINVAL;
110
111	rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
112	if (rval < 0)
113	return rval;
114
115	ctrl->val = 0;
116	if (reg_val & FAULT_TIMEOUT)
117	ctrl->val \|= V4L2_FLASH_FAULT_TIMEOUT;
118	if (reg_val & FAULT_SHORT_CIRCUIT)
119	ctrl->val \|= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
120	if (reg_val & FAULT_UVLO)
121	ctrl->val \|= V4L2_FLASH_FAULT_UNDER_VOLTAGE;
122	if (reg_val & FAULT_IVFM)
123	ctrl->val \|= V4L2_FLASH_FAULT_INPUT_VOLTAGE;
124	if (reg_val & FAULT_OCP)
125	ctrl->val \|= V4L2_FLASH_FAULT_OVER_CURRENT;
126	if (reg_val & FAULT_OVERTEMP)
127	ctrl->val \|= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
128	if (reg_val & FAULT_NTC_TRIP)
129	ctrl->val \|= V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE;
130	if (reg_val & FAULT_OVP)
131	ctrl->val \|= V4L2_FLASH_FAULT_OVER_VOLTAGE;
132
133	return 0;
134	}
135
136	static int lm3646_set_ctrl(struct v4l2_ctrl *ctrl)
137	{
138	struct lm3646_flash *flash = to_lm3646_flash(ctrl);
139	unsigned int reg_val;
140	int rval = -EINVAL;
141
142	switch (ctrl->id) {
143	case V4L2_CID_FLASH_LED_MODE:
144
145	if (ctrl->val != V4L2_FLASH_LED_MODE_FLASH)
146	return lm3646_mode_ctrl(flash, ctrl->val);
147	/* switch to SHDN mode before flash strobe on */
148	return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
149
150	case V4L2_CID_FLASH_STROBE_SOURCE:
151	return regmap_update_bits(flash->regmap,
152	REG_STROBE_SRC, MASK_STROBE_SRC,
153	(ctrl->val) << 7);
154
155	case V4L2_CID_FLASH_STROBE:
156
157	/* read and check current mode of chip to start flash */
158	rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
159	if (rval < 0 \|\| ((reg_val & MASK_ENABLE) != MODE_SHDN))
160	return rval;
161	/* flash on */
162	return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_FLASH);
163
164	case V4L2_CID_FLASH_STROBE_STOP:
165
166	/*
167	* flash mode will be turned automatically
168	* from FLASH mode to SHDN mode after flash duration timeout
169	* read and check current mode of chip to stop flash
170	*/
171	rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
172	if (rval < 0)
173	return rval;
174	if ((reg_val & MASK_ENABLE) == MODE_FLASH)
175	return lm3646_mode_ctrl(flash,
176	V4L2_FLASH_LED_MODE_NONE);
177	return rval;
178
179	case V4L2_CID_FLASH_TIMEOUT:
180	return regmap_update_bits(flash->regmap,
181	REG_FLASH_TOUT, MASK_FLASH_TOUT,
182	LM3646_FLASH_TOUT_ms_TO_REG
183	(ctrl->val));
184
185	case V4L2_CID_FLASH_INTENSITY:
186	return regmap_update_bits(flash->regmap,
187	REG_FLASH_BR, MASK_FLASH_BR,
188	LM3646_TOTAL_FLASH_BRT_uA_TO_REG
189	(ctrl->val));
190
191	case V4L2_CID_FLASH_TORCH_INTENSITY:
192	return regmap_update_bits(flash->regmap,
193	REG_TORCH_BR, MASK_TORCH_BR,
194	LM3646_TOTAL_TORCH_BRT_uA_TO_REG
195	(ctrl->val) << 4);
196	}
197
198	return -EINVAL;
199	}
200
201	static const struct v4l2_ctrl_ops lm3646_led_ctrl_ops = {
202	.g_volatile_ctrl = lm3646_get_ctrl,
203	.s_ctrl = lm3646_set_ctrl,
204	};
205
206	static int lm3646_init_controls(struct lm3646_flash *flash)
207	{
208	struct v4l2_ctrl *fault;
209	struct v4l2_ctrl_handler *hdl = &flash->ctrls_led;
210	const struct v4l2_ctrl_ops *ops = &lm3646_led_ctrl_ops;
211
212	v4l2_ctrl_handler_init(hdl, 8);
213	/* flash mode */
214	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_LED_MODE,
215	V4L2_FLASH_LED_MODE_TORCH, ~0x7,
216	V4L2_FLASH_LED_MODE_NONE);
217
218	/* flash source */
219	v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_STROBE_SOURCE,
220	0x1, ~0x3, V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
221
222	/* flash strobe */
223	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
224	/* flash strobe stop */
225	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
226
227	/* flash strobe timeout */
228	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TIMEOUT,
229	LM3646_FLASH_TOUT_MIN,
230	LM3646_FLASH_TOUT_MAX,
231	LM3646_FLASH_TOUT_STEP, flash->pdata->flash_timeout);
232
233	/* max flash current */
234	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
235	LM3646_TOTAL_FLASH_BRT_MIN,
236	LM3646_TOTAL_FLASH_BRT_MAX,
237	LM3646_TOTAL_FLASH_BRT_STEP,
238	LM3646_TOTAL_FLASH_BRT_MAX);
239
240	/* max torch current */
241	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
242	LM3646_TOTAL_TORCH_BRT_MIN,
243	LM3646_TOTAL_TORCH_BRT_MAX,
244	LM3646_TOTAL_TORCH_BRT_STEP,
245	LM3646_TOTAL_TORCH_BRT_MAX);
246
247	/* fault */
248	fault = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_FAULT, 0,
249	V4L2_FLASH_FAULT_OVER_VOLTAGE
250	\| V4L2_FLASH_FAULT_OVER_TEMPERATURE
251	\| V4L2_FLASH_FAULT_SHORT_CIRCUIT
252	\| V4L2_FLASH_FAULT_TIMEOUT, 0, 0);
253	if (fault != NULL)
254	fault->flags \|= V4L2_CTRL_FLAG_VOLATILE;
255
256	if (hdl->error)
257	return hdl->error;
258
259	flash->subdev_led.ctrl_handler = hdl;
260	return 0;
261	}
262
263	/* initialize device */
264	static const struct v4l2_subdev_ops lm3646_ops = {
265	.core = NULL,
266	};
267
268	static const struct regmap_config lm3646_regmap = {
269	.reg_bits = 8,
270	.val_bits = 8,
271	.max_register = 0xFF,
272	};
273
274	static int lm3646_subdev_init(struct lm3646_flash *flash)
275	{
276	struct i2c_client *client = to_i2c_client(flash->dev);
277	int rval;
278
279	v4l2_i2c_subdev_init(&flash->subdev_led, client, &lm3646_ops);
280	flash->subdev_led.flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;
281	strcpy(flash->subdev_led.name, LM3646_NAME);
282	rval = lm3646_init_controls(flash);
283	if (rval)
284	goto err_out;
18095107	285	rval = media_entity_init(&flash->subdev_led.entity, 0, NULL);
dc76df5d DJ	286	if (rval < 0)
	287	goto err_out;
	288	flash->subdev_led.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
	289	return rval;
	290
	291	err_out:
	292	v4l2_ctrl_handler_free(&flash->ctrls_led);
	293	return rval;
	294	}
	295
	296	static int lm3646_init_device(struct lm3646_flash *flash)
	297	{
	298	unsigned int reg_val;
	299	int rval;
	300
	301	/* read the value of mode register to reduce redundant i2c accesses */
	302	rval = regmap_read(flash->regmap, REG_ENABLE, &reg_val);
	303	if (rval < 0)
	304	return rval;
	305	flash->mode_reg = reg_val & 0xfc;
	306
	307	/* output disable */
	308	rval = lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
	309	if (rval < 0)
	310	return rval;
	311
	312	/*
	313	* LED1 flash current setting
	314	* LED2 flash current = Total(Max) flash current - LED1 flash current
	315	*/
	316	rval = regmap_update_bits(flash->regmap,
	317	REG_LED1_FLASH_BR, 0x7F,
	318	LM3646_LED1_FLASH_BRT_uA_TO_REG
	319	(flash->pdata->led1_flash_brt));
	320
	321	if (rval < 0)
	322	return rval;
	323
	324	/*
	325	* LED1 torch current setting
	326	* LED2 torch current = Total(Max) torch current - LED1 torch current
	327	*/
	328	rval = regmap_update_bits(flash->regmap,
	329	REG_LED1_TORCH_BR, 0x7F,
	330	LM3646_LED1_TORCH_BRT_uA_TO_REG
	331	(flash->pdata->led1_torch_brt));
	332	if (rval < 0)
	333	return rval;
	334
	335	/* Reset flag register */
	336	return regmap_read(flash->regmap, REG_FLAG, &reg_val);
	337	}
	338
	339	static int lm3646_probe(struct i2c_client *client,
	340	const struct i2c_device_id *devid)
	341	{
	342	struct lm3646_flash *flash;
	343	struct lm3646_platform_data *pdata = dev_get_platdata(&client->dev);
	344	int rval;
	345
	346	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
	347	if (flash == NULL)
	348	return -ENOMEM;
	349
350	flash->regmap = devm_regmap_init_i2c(client, &lm3646_regmap);
351	if (IS_ERR(flash->regmap))
352	return PTR_ERR(flash->regmap);
353
354	/* check device tree if there is no platform data */
355	if (pdata == NULL) {
356	pdata = devm_kzalloc(&client->dev,
357	sizeof(struct lm3646_platform_data),
358	GFP_KERNEL);
359	if (pdata == NULL)
360	return -ENOMEM;
361	/* use default data in case of no platform data */
362	pdata->flash_timeout = LM3646_FLASH_TOUT_MAX;
363	pdata->led1_torch_brt = LM3646_LED1_TORCH_BRT_MAX;
364	pdata->led1_flash_brt = LM3646_LED1_FLASH_BRT_MAX;
365	}
366	flash->pdata = pdata;
367	flash->dev = &client->dev;
368
369	rval = lm3646_subdev_init(flash);
370	if (rval < 0)
371	return rval;
372
373	rval = lm3646_init_device(flash);
374	if (rval < 0)
375	return rval;
376
377	i2c_set_clientdata(client, flash);
378
379	return 0;
380	}
381
382	static int lm3646_remove(struct i2c_client *client)
383	{
384	struct lm3646_flash *flash = i2c_get_clientdata(client);
385
386	v4l2_device_unregister_subdev(&flash->subdev_led);
387	v4l2_ctrl_handler_free(&flash->ctrls_led);
388	media_entity_cleanup(&flash->subdev_led.entity);
389
390	return 0;
391	}
392
393	static const struct i2c_device_id lm3646_id_table[] = {
394	{LM3646_NAME, 0},
395	{}
396	};
397
398	MODULE_DEVICE_TABLE(i2c, lm3646_id_table);
399
400	static struct i2c_driver lm3646_i2c_driver = {
401	.driver = {
402	.name = LM3646_NAME,
403	},
404	.probe = lm3646_probe,
405	.remove = lm3646_remove,
406	.id_table = lm3646_id_table,
407	};
408
409	module_i2c_driver(lm3646_i2c_driver);
410
411	MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
412	MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
413	MODULE_DESCRIPTION("Texas Instruments LM3646 Dual Flash LED driver");
414	MODULE_LICENSE("GPL");