diff options
Diffstat (limited to 'drivers/leds/leds-max77693.c')
| -rw-r--r-- | drivers/leds/leds-max77693.c | 129 |
1 files changed, 123 insertions, 6 deletions
diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c index eecaa9292b2f..b8b0eec7b540 100644 --- a/drivers/leds/leds-max77693.c +++ b/drivers/leds/leds-max77693.c @@ -20,6 +20,7 @@ #include <linux/regmap.h> #include <linux/slab.h> #include <linux/workqueue.h> +#include <media/v4l2-flash-led-class.h> #define MODE_OFF 0 #define MODE_FLASH(a) (1 << (a)) @@ -62,6 +63,8 @@ struct max77693_sub_led { struct led_classdev_flash fled_cdev; /* assures led-triggers compatibility */ struct work_struct work_brightness_set; + /* V4L2 Flash device */ + struct v4l2_flash *v4l2_flash; /* brightness cache */ unsigned int torch_brightness; @@ -627,7 +630,8 @@ static int max77693_led_flash_timeout_set( } static int max77693_led_parse_dt(struct max77693_led_device *led, - struct max77693_led_config_data *cfg) + struct max77693_led_config_data *cfg, + struct device_node **sub_nodes) { struct device *dev = &led->pdev->dev; struct max77693_sub_led *sub_leds = led->sub_leds; @@ -674,6 +678,13 @@ static int max77693_led_parse_dt(struct max77693_led_device *led, return -EINVAL; } + if (sub_nodes[fled_id]) { + dev_err(dev, + "Conflicting \"led-sources\" DT properties\n"); + return -EINVAL; + } + + sub_nodes[fled_id] = child_node; sub_leds[fled_id].fled_id = fled_id; cfg->label[fled_id] = @@ -786,11 +797,12 @@ static void max77693_led_validate_configuration(struct max77693_led_device *led, } static int max77693_led_get_configuration(struct max77693_led_device *led, - struct max77693_led_config_data *cfg) + struct max77693_led_config_data *cfg, + struct device_node **sub_nodes) { int ret; - ret = max77693_led_parse_dt(led, cfg); + ret = max77693_led_parse_dt(led, cfg, sub_nodes); if (ret < 0) return ret; @@ -838,6 +850,71 @@ static void max77693_init_flash_settings(struct max77693_sub_led *sub_led, setting->val = setting->max; } +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) + +static int max77693_led_external_strobe_set( + struct v4l2_flash *v4l2_flash, + bool enable) +{ + struct max77693_sub_led *sub_led = + flcdev_to_sub_led(v4l2_flash->fled_cdev); + struct max77693_led_device *led = sub_led_to_led(sub_led); + int fled_id = sub_led->fled_id; + int ret; + + mutex_lock(&led->lock); + + if (enable) + ret = max77693_add_mode(led, MODE_FLASH_EXTERNAL(fled_id)); + else + ret = max77693_clear_mode(led, MODE_FLASH_EXTERNAL(fled_id)); + + mutex_unlock(&led->lock); + + return ret; +} + +static void max77693_init_v4l2_flash_config(struct max77693_sub_led *sub_led, + struct max77693_led_config_data *led_cfg, + struct v4l2_flash_config *v4l2_sd_cfg) +{ + struct max77693_led_device *led = sub_led_to_led(sub_led); + struct device *dev = &led->pdev->dev; + struct max77693_dev *iodev = dev_get_drvdata(dev->parent); + struct i2c_client *i2c = iodev->i2c; + struct led_flash_setting *s; + + snprintf(v4l2_sd_cfg->dev_name, sizeof(v4l2_sd_cfg->dev_name), + "%s %d-%04x", sub_led->fled_cdev.led_cdev.name, + i2c_adapter_id(i2c->adapter), i2c->addr); + + s = &v4l2_sd_cfg->torch_intensity; + s->min = TORCH_IOUT_MIN; + s->max = sub_led->fled_cdev.led_cdev.max_brightness * TORCH_IOUT_STEP; + s->step = TORCH_IOUT_STEP; + s->val = s->max; + + /* Init flash faults config */ + v4l2_sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | + LED_FAULT_SHORT_CIRCUIT | + LED_FAULT_OVER_CURRENT; + + v4l2_sd_cfg->has_external_strobe = true; +} + +static const struct v4l2_flash_ops v4l2_flash_ops = { + .external_strobe_set = max77693_led_external_strobe_set, +}; +#else +static inline void max77693_init_v4l2_flash_config( + struct max77693_sub_led *sub_led, + struct max77693_led_config_data *led_cfg, + struct v4l2_flash_config *v4l2_sd_cfg) +{ +} +static const struct v4l2_flash_ops v4l2_flash_ops; +#endif + static void max77693_init_fled_cdev(struct max77693_sub_led *sub_led, struct max77693_led_config_data *led_cfg) { @@ -870,12 +947,45 @@ static void max77693_init_fled_cdev(struct max77693_sub_led *sub_led, sub_led->flash_timeout = fled_cdev->timeout.val; } +static int max77693_register_led(struct max77693_sub_led *sub_led, + struct max77693_led_config_data *led_cfg, + struct device_node *sub_node) +{ + struct max77693_led_device *led = sub_led_to_led(sub_led); + struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev; + struct device *dev = &led->pdev->dev; + struct v4l2_flash_config v4l2_sd_cfg = {}; + int ret; + + /* Register in the LED subsystem */ + ret = led_classdev_flash_register(dev, fled_cdev); + if (ret < 0) + return ret; + + max77693_init_v4l2_flash_config(sub_led, led_cfg, &v4l2_sd_cfg); + + /* Register in the V4L2 subsystem. */ + sub_led->v4l2_flash = v4l2_flash_init(dev, sub_node, fled_cdev, NULL, + &v4l2_flash_ops, &v4l2_sd_cfg); + if (IS_ERR(sub_led->v4l2_flash)) { + ret = PTR_ERR(sub_led->v4l2_flash); + goto err_v4l2_flash_init; + } + + return 0; + +err_v4l2_flash_init: + led_classdev_flash_unregister(fled_cdev); + return ret; +} + static int max77693_led_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct max77693_dev *iodev = dev_get_drvdata(dev->parent); struct max77693_led_device *led; struct max77693_sub_led *sub_leds; + struct device_node *sub_nodes[2] = {}; struct max77693_led_config_data led_cfg = {}; int init_fled_cdev[2], i, ret; @@ -889,7 +999,7 @@ static int max77693_led_probe(struct platform_device *pdev) sub_leds = led->sub_leds; platform_set_drvdata(pdev, led); - ret = max77693_led_get_configuration(led, &led_cfg); + ret = max77693_led_get_configuration(led, &led_cfg, sub_nodes); if (ret < 0) return ret; @@ -911,8 +1021,12 @@ static int max77693_led_probe(struct platform_device *pdev) /* Initialize LED Flash class device */ max77693_init_fled_cdev(&sub_leds[i], &led_cfg); - /* Register LED Flash class device */ - ret = led_classdev_flash_register(dev, &sub_leds[i].fled_cdev); + /* + * Register LED Flash class device and corresponding + * V4L2 Flash device. + */ + ret = max77693_register_led(&sub_leds[i], &led_cfg, + sub_nodes[i]); if (ret < 0) { /* * At this moment FLED1 might have been already @@ -931,6 +1045,7 @@ err_register_led2: /* It is possible than only FLED2 was to be registered */ if (!init_fled_cdev[FLED1]) goto err_register_led1; + v4l2_flash_release(sub_leds[FLED1].v4l2_flash); led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev); err_register_led1: mutex_destroy(&led->lock); @@ -944,11 +1059,13 @@ static int max77693_led_remove(struct platform_device *pdev) struct max77693_sub_led *sub_leds = led->sub_leds; if (led->iout_joint || max77693_fled_used(led, FLED1)) { + v4l2_flash_release(sub_leds[FLED1].v4l2_flash); led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev); cancel_work_sync(&sub_leds[FLED1].work_brightness_set); } if (!led->iout_joint && max77693_fled_used(led, FLED2)) { + v4l2_flash_release(sub_leds[FLED2].v4l2_flash); led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev); cancel_work_sync(&sub_leds[FLED2].work_brightness_set); } |