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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * drivers/media/i2c/lm3646.c4 * General device driver for TI lm3646, Dual FLASH LED Driver5 *6 * Copyright (C) 2014 Texas Instruments7 *8 * Contact: Daniel Jeong <gshark.jeong@gmail.com>9 *			Ldd-Mlp <ldd-mlp@list.ti.com>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>18#include <media/i2c/lm3646.h>19#include <media/v4l2-ctrls.h>20#include <media/v4l2-device.h>21 22/* registers definitions */23#define REG_ENABLE		0x0124#define REG_TORCH_BR	0x0525#define REG_FLASH_BR	0x0526#define REG_FLASH_TOUT	0x0427#define REG_FLAG		0x0828#define REG_STROBE_SRC	0x0629#define REG_LED1_FLASH_BR 0x0630#define REG_LED1_TORCH_BR 0x0731 32#define MASK_ENABLE		0x0333#define MASK_TORCH_BR	0x7034#define MASK_FLASH_BR	0x0F35#define MASK_FLASH_TOUT	0x0736#define MASK_FLAG		0xFF37#define MASK_STROBE_SRC	0x8038 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 49enum led_mode {50	MODE_SHDN = 0x0,51	MODE_TORCH = 0x2,52	MODE_FLASH = 0x3,53};54 55/*56 * struct lm3646_flash57 *58 * @pdata: platform data59 * @regmap: reg. map for i2c60 * @lock: muxtex for serial access.61 * @led_mode: V4L2 LED mode62 * @ctrls_led: V4L2 controls63 * @subdev_led: V4L2 subdev64 * @mode_reg : mode register value65 */66struct 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 */81static 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  */99static 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 133static 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;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 automatically165		 * from FLASH mode to SHDN mode after flash duration timeout166		 * read and check current mode of chip to stop flash167		 */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_REG180					  (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_REG186					  (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_REG192					  (ctrl->val) << 4);193	}194 195	return -EINVAL;196}197 198static const struct v4l2_ctrl_ops lm3646_led_ctrl_ops = {199	.g_volatile_ctrl = lm3646_get_ctrl,200	.s_ctrl = lm3646_set_ctrl,201};202 203static 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_VOLTAGE247				  | V4L2_FLASH_FAULT_OVER_TEMPERATURE248				  | V4L2_FLASH_FAULT_SHORT_CIRCUIT249				  | 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 */261static const struct v4l2_subdev_ops lm3646_ops = {262	.core = NULL,263};264 265static const struct regmap_config lm3646_regmap = {266	.reg_bits = 8,267	.val_bits = 8,268	.max_register = 0xFF,269};270 271static 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;278	strscpy(flash->subdev_led.name, LM3646_NAME,279		sizeof(flash->subdev_led.name));280	rval = lm3646_init_controls(flash);281	if (rval)282		goto err_out;283	rval = media_entity_pads_init(&flash->subdev_led.entity, 0, NULL);284	if (rval < 0)285		goto err_out;286	flash->subdev_led.entity.function = MEDIA_ENT_F_FLASH;287	return rval;288 289err_out:290	v4l2_ctrl_handler_free(&flash->ctrls_led);291	return rval;292}293 294static 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 setting312	 * LED2 flash current = Total(Max) flash current - LED1 flash current313	 */314	rval = regmap_update_bits(flash->regmap,315				  REG_LED1_FLASH_BR, 0x7F,316				  LM3646_LED1_FLASH_BRT_uA_TO_REG317				  (flash->pdata->led1_flash_brt));318 319	if (rval < 0)320		return rval;321 322	/*323	 * LED1 torch current setting324	 * LED2 torch current = Total(Max) torch current - LED1 torch current325	 */326	rval = regmap_update_bits(flash->regmap,327				  REG_LED1_TORCH_BR, 0x7F,328				  LM3646_LED1_TORCH_BRT_uA_TO_REG329				  (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 337static int lm3646_probe(struct i2c_client *client)338{339	struct lm3646_flash *flash;340	struct lm3646_platform_data *pdata = dev_get_platdata(&client->dev);341	int rval;342 343	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);344	if (flash == NULL)345		return -ENOMEM;346 347	flash->regmap = devm_regmap_init_i2c(client, &lm3646_regmap);348	if (IS_ERR(flash->regmap))349		return PTR_ERR(flash->regmap);350 351	/* check device tree if there is no platform data */352	if (pdata == NULL) {353		pdata = devm_kzalloc(&client->dev,354				     sizeof(struct lm3646_platform_data),355				     GFP_KERNEL);356		if (pdata == NULL)357			return -ENOMEM;358		/* use default data in case of no platform data */359		pdata->flash_timeout = LM3646_FLASH_TOUT_MAX;360		pdata->led1_torch_brt = LM3646_LED1_TORCH_BRT_MAX;361		pdata->led1_flash_brt = LM3646_LED1_FLASH_BRT_MAX;362	}363	flash->pdata = pdata;364	flash->dev = &client->dev;365 366	rval = lm3646_subdev_init(flash);367	if (rval < 0)368		return rval;369 370	rval = lm3646_init_device(flash);371	if (rval < 0)372		return rval;373 374	i2c_set_clientdata(client, flash);375 376	return 0;377}378 379static void lm3646_remove(struct i2c_client *client)380{381	struct lm3646_flash *flash = i2c_get_clientdata(client);382 383	v4l2_device_unregister_subdev(&flash->subdev_led);384	v4l2_ctrl_handler_free(&flash->ctrls_led);385	media_entity_cleanup(&flash->subdev_led.entity);386}387 388static const struct i2c_device_id lm3646_id_table[] = {389	{ LM3646_NAME },390	{}391};392 393MODULE_DEVICE_TABLE(i2c, lm3646_id_table);394 395static struct i2c_driver lm3646_i2c_driver = {396	.driver = {397		   .name = LM3646_NAME,398		   },399	.probe = lm3646_probe,400	.remove = lm3646_remove,401	.id_table = lm3646_id_table,402};403 404module_i2c_driver(lm3646_i2c_driver);405 406MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");407MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");408MODULE_DESCRIPTION("Texas Instruments LM3646 Dual Flash LED driver");409MODULE_LICENSE("GPL");410