leds: aat1290: add support for V4L2 Flash sub-device (ac69b903) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/leds/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -47,6 +47,7 @@ config LEDS_AAT1290
		depends on LEDS_CLASS_FLASH
		depends on GPIOLIB
		depends on OF
		depends on PINCTRL
		help
		This option enables support for the LEDs on the AAT1290.

drivers/leds/leds-aat1290.c

+131 −6

Original line number	Diff line number	Diff line
		@@ -17,9 +17,11 @@
		#include <linux/module.h>
		#include <linux/mutex.h>
		#include <linux/of.h>
		#include <linux/pinctrl/consumer.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <linux/workqueue.h>
		#include <media/v4l2-flash-led-class.h>

		#define AAT1290_MOVIE_MODE_CURRENT_ADDR 17
		#define AAT1290_MAX_MM_CURR_PERCENT_0 16
		@@ -52,6 +54,8 @@ struct aat1290_led_config_data {
		u32 max_flash_current;
		/* maximum flash timeout */
		u32 max_flash_tm;
		/* external strobe capability */
		bool has_external_strobe;
		/* max LED brightness level */
		enum led_brightness max_brightness;
		};
		@@ -64,6 +68,8 @@ struct aat1290_led {

		/* corresponding LED Flash class device */
		struct led_classdev_flash fled_cdev;
		/* V4L2 Flash device */
		struct v4l2_flash *v4l2_flash;

		/* FLEN pin */
		struct gpio_desc *gpio_fl_en;
		@@ -230,11 +236,15 @@ static int aat1290_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
		}

		static int aat1290_led_parse_dt(struct aat1290_led *led,
		struct aat1290_led_config_data *cfg)
		struct aat1290_led_config_data *cfg,
		struct device_node **sub_node)
		{
		struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
		struct device *dev = &led->pdev->dev;
		struct device_node *child_node;
		#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
		struct pinctrl *pinctrl;
		#endif
		int ret = 0;

		led->gpio_fl_en = devm_gpiod_get(dev, "flen");
		@@ -251,6 +261,17 @@ static int aat1290_led_parse_dt(struct aat1290_led *led,
		return ret;
		}

		#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
		pinctrl = devm_pinctrl_get_select_default(&led->pdev->dev);
		if (IS_ERR(pinctrl)) {
		cfg->has_external_strobe = false;
		dev_info(dev,
		"No support for external strobe detected.\n");
		} else {
		cfg->has_external_strobe = true;
		}
		#endif

		child_node = of_get_next_available_child(dev->of_node, NULL);
		if (!child_node) {
		dev_err(dev, "No DT child node found for connected LED.\n");
		@@ -288,6 +309,8 @@ static int aat1290_led_parse_dt(struct aat1290_led *led,

		of_node_put(child_node);

		*sub_node = child_node;

		return ret;
		}

		@@ -316,7 +339,8 @@ int init_mm_current_scale(struct aat1290_led *led,
		int i, max_mm_current =
		AAT1290_MAX_MM_CURRENT(cfg->max_flash_current);

		led->mm_current_scale = kzalloc(sizeof(max_mm_current_percent),
		led->mm_current_scale = devm_kzalloc(&led->pdev->dev,
		sizeof(max_mm_current_percent),
		GFP_KERNEL);
		if (!led->mm_current_scale)
		return -ENOMEM;
		@@ -329,11 +353,12 @@ int init_mm_current_scale(struct aat1290_led *led,
		}

		static int aat1290_led_get_configuration(struct aat1290_led *led,
		struct aat1290_led_config_data *cfg)
		struct aat1290_led_config_data *cfg,
		struct device_node **sub_node)
		{
		int ret;

		ret = aat1290_led_parse_dt(led, cfg);
		ret = aat1290_led_parse_dt(led, cfg, sub_node);
		if (ret < 0)
		return ret;
		/*
		@@ -346,7 +371,10 @@ static int aat1290_led_get_configuration(struct aat1290_led *led,

		aat1290_led_validate_mm_current(led, cfg);

		kfree(led->mm_current_scale);
		#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
		#else
		devm_kfree(&led->pdev->dev, led->mm_current_scale);
		#endif

		return 0;
		}
		@@ -365,6 +393,88 @@ static void aat1290_init_flash_timeout(struct aat1290_led *led,
		setting->val = setting->max;
		}

		#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
		static enum led_brightness aat1290_intensity_to_brightness(
		struct v4l2_flash *v4l2_flash,
		s32 intensity)
		{
		struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
		struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
		int i;

		for (i = AAT1290_MM_CURRENT_SCALE_SIZE - 1; i >= 0; --i)
		if (intensity >= led->mm_current_scale[i])
		return i + 1;

		return 1;
		}

		static s32 aat1290_brightness_to_intensity(struct v4l2_flash *v4l2_flash,
		enum led_brightness brightness)
		{
		struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
		struct aat1290_led *led = fled_cdev_to_led(fled_cdev);

		return led->mm_current_scale[brightness - 1];
		}

		static int aat1290_led_external_strobe_set(struct v4l2_flash *v4l2_flash,
		bool enable)
		{
		struct aat1290_led *led = fled_cdev_to_led(v4l2_flash->fled_cdev);
		struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
		struct led_classdev *led_cdev = &fled_cdev->led_cdev;
		struct pinctrl *pinctrl;

		gpiod_direction_output(led->gpio_fl_en, 0);
		gpiod_direction_output(led->gpio_en_set, 0);

		led->movie_mode = false;
		led_cdev->brightness = 0;

		pinctrl = devm_pinctrl_get_select(&led->pdev->dev,
		enable ? "isp" : "host");
		if (IS_ERR(pinctrl)) {
		dev_warn(&led->pdev->dev, "Unable to switch strobe source.\n");
		return PTR_ERR(pinctrl);
		}

		return 0;
		}

		static void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
		struct aat1290_led_config_data *led_cfg,
		struct v4l2_flash_config *v4l2_sd_cfg)
		{
		struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
		struct led_flash_setting *s;

		strlcpy(v4l2_sd_cfg->dev_name, led_cdev->name,
		sizeof(v4l2_sd_cfg->dev_name));

		s = &v4l2_sd_cfg->torch_intensity;
		s->min = led->mm_current_scale[0];
		s->max = led_cfg->max_mm_current;
		s->step = 1;
		s->val = s->max;

		v4l2_sd_cfg->has_external_strobe = led_cfg->has_external_strobe;
		}

		static const struct v4l2_flash_ops v4l2_flash_ops = {
		.external_strobe_set = aat1290_led_external_strobe_set,
		.intensity_to_led_brightness = aat1290_intensity_to_brightness,
		.led_brightness_to_intensity = aat1290_brightness_to_intensity,
		};
		#else
		static inline void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
		struct aat1290_led_config_data *led_cfg,
		struct v4l2_flash_config *v4l2_sd_cfg)
		{
		}
		static const struct v4l2_flash_ops v4l2_flash_ops;
		#endif

		static const struct led_flash_ops flash_ops = {
		.strobe_set = aat1290_led_flash_strobe_set,
		.timeout_set = aat1290_led_flash_timeout_set,
		@@ -373,10 +483,12 @@ static const struct led_flash_ops flash_ops = {
		static int aat1290_led_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct device_node *sub_node = NULL;
		struct aat1290_led *led;
		struct led_classdev *led_cdev;
		struct led_classdev_flash *fled_cdev;
		struct aat1290_led_config_data led_cfg = {};
		struct v4l2_flash_config v4l2_sd_cfg = {};
		int ret;

		led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
		@@ -390,7 +502,7 @@ static int aat1290_led_probe(struct platform_device *pdev)
		fled_cdev->ops = &flash_ops;
		led_cdev = &fled_cdev->led_cdev;

		ret = aat1290_led_get_configuration(led, &led_cfg);
		ret = aat1290_led_get_configuration(led, &led_cfg, &sub_node);
		if (ret < 0)
		return ret;

		@@ -410,8 +522,20 @@ static int aat1290_led_probe(struct platform_device *pdev)
		if (ret < 0)
		goto err_flash_register;

		aat1290_init_v4l2_flash_config(led, &led_cfg, &v4l2_sd_cfg);

		/* Create V4L2 Flash subdev. */
		led->v4l2_flash = v4l2_flash_init(dev, sub_node, fled_cdev, NULL,
		&v4l2_flash_ops, &v4l2_sd_cfg);
		if (IS_ERR(led->v4l2_flash)) {
		ret = PTR_ERR(led->v4l2_flash);
		goto error_v4l2_flash_init;
		}

		return 0;

		error_v4l2_flash_init:
		led_classdev_flash_unregister(fled_cdev);
		err_flash_register:
		mutex_destroy(&led->lock);

		@@ -422,6 +546,7 @@ static int aat1290_led_remove(struct platform_device *pdev)
		{
		struct aat1290_led *led = platform_get_drvdata(pdev);

		v4l2_flash_release(led->v4l2_flash);
		led_classdev_flash_unregister(&led->fled_cdev);
		cancel_work_sync(&led->work_brightness_set);