Hi Jacek,
On Tue, Apr 28, 2015 at 09:18:50AM +0200, Jacek Anaszewski wrote:
> Add support for V4L2 Flash sub-device to the aat1290 LED Flash class
> driver. The support allows for V4L2 Flash sub-device to take the control
> of the LED Flash class device.
>
> Signed-off-by: Jacek Anaszewski <j.anaszew...@samsung.com>
> Acked-by: Kyungmin Park <kyungmin.p...@samsung.com>
> Cc: Bryan Wu <coolo...@gmail.com>
> Cc: Richard Purdie <rpur...@rpsys.net>
> Cc: Sakari Ailus <sakari.ai...@iki.fi>
> ---
> drivers/leds/Kconfig | 1 +
> drivers/leds/leds-aat1290.c | 137
> +++++++++++++++++++++++++++++++++++++++++--
> 2 files changed, 132 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index dd7834c..874df63 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -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.
>
> diff --git a/drivers/leds/leds-aat1290.c b/drivers/leds/leds-aat1290.c
> index 03e5b96..f37f848 100644
> --- a/drivers/leds/leds-aat1290.c
> +++ b/drivers/leds/leds-aat1290.c
> @@ -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 +393,83 @@ static void aat1290_init_flash_timeout(struct
> aat1290_led *led,
> setting->val = setting->max;
> }
>
> +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> +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;
> +}
> +
> +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->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
> +#define aat1290_init_v4l2_flash_config(led, led_cfg, v4l2_sd_cfg)
> +#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 +478,14 @@ 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 = {};
> +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> + struct v4l2_flash_config v4l2_sd_cfg = {};
> +#endif
> int ret;
>
> led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
> @@ -390,7 +499,7 @@ 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 +519,23 @@ 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);
> +
> + led_cdev->dev->of_node = sub_node;
What's the reason for this? I can't immediately see how this is being used.
There's also a problem with references, you should grab it here and release
when it's no longer used.
> +
> + /* Create V4L2 Flash subdev. */
> + led->v4l2_flash = v4l2_flash_init(fled_cdev,
> + &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);
>
--
Kind regards,
Sakari Ailus
e-mail: sakari.ai...@iki.fi XMPP: sai...@retiisi.org.uk
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