// 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 * Ldd-Mlp */ #include #include #include #include #include #include #include #include #include /* 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, ®_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; 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, ®_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, ®_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, ®_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, ®_val); } static int lm3646_probe(struct i2c_client *client) { 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 void 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); } static const struct i2c_device_id lm3646_id_table[] = { { LM3646_NAME }, {} }; 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 "); MODULE_AUTHOR("Ldd Mlp "); MODULE_DESCRIPTION("Texas Instruments LM3646 Dual Flash LED driver"); MODULE_LICENSE("GPL");