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SubjectRe: [PATCH/RFC v9 19/19] leds: aat1290: add support for V4L2 Flash sub-device
Hi Jacek,

On Wed, Dec 03, 2014 at 05:06:54PM +0100, 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.anaszewski@samsung.com>
> Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
> Cc: Bryan Wu <cooloney@gmail.com>
> Cc: Richard Purdie <rpurdie@rpsys.net>
> Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
> drivers/leds/leds-aat1290.c | 61 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 61 insertions(+)
>
> diff --git a/drivers/leds/leds-aat1290.c b/drivers/leds/leds-aat1290.c
> index 15d969b..81a8f48 100644
> --- a/drivers/leds/leds-aat1290.c
> +++ b/drivers/leds/leds-aat1290.c
> @@ -21,6 +21,7 @@
> #include <linux/gpio.h>
> #include <linux/of_gpio.h>
> #include <linux/of.h>
> +#include <media/v4l2-flash.h>
> #include <linux/workqueue.h>
>
> #define AAT1290_MOVIE_MODE_CURRENT_ADDR 17
> @@ -63,6 +64,7 @@ struct aat1290_led {
> struct mutex lock;
>
> struct led_classdev_flash ldev;
> + struct v4l2_flash *v4l2_flash;
>
> int flen_gpio;
> int en_set_gpio;
> @@ -280,11 +282,51 @@ static void aat1290_init_flash_settings(struct aat1290_led *led,
> setting->val = setting->max;
> }
>
> +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> +static void aat1290_init_v4l2_ctrl_config(struct aat1290_led_settings *s,
> + struct v4l2_flash_ctrl_config *config)
> +{
> + struct led_flash_setting *setting;
> + struct v4l2_ctrl_config *c;
> +
> + c = &config->intensity;
> + setting = &s->torch_brightness;
> + c->min = setting->min;
> + c->max = setting->max;
> + c->step = setting->step;

Hmm. How does the intensity get configured over the V4L2 controls? Based on
an earlier patch, the intensity control looks very much non-linear.

> + c->def = setting->val;
> +
> + c = &config->flash_timeout;
> + setting = &s->flash_timeout;
> + c->min = setting->min;
> + c->max = setting->max;
> + c->step = setting->step;
> + c->def = setting->val;
> +
> + config->has_external_strobe = false;
> +}
> +#else
> +#define aat1290_init_v4l2_ctrl_config(s, config)
> +#endif
> +
> static const struct led_flash_ops flash_ops = {
> .strobe_set = aat1290_led_flash_strobe_set,
> .timeout_set = aat1290_led_flash_timeout_set,
> };
>
> +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> +static const struct v4l2_flash_ops v4l2_flash_ops = {
> + .external_strobe_set = NULL,
> +};
> +
> +static const struct v4l2_flash_ops *get_v4l2_flash_ops(void)
> +{
> + return &v4l2_flash_ops;

You can use v4l2_flash_ops directly, no need for a function to return them.

> +}
> +#else
> +#define get_v4l2_flash_ops() (NULL)
> +#endif
> +
> static int aat1290_led_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -292,6 +334,9 @@ static int aat1290_led_probe(struct platform_device *pdev)
> struct aat1290_led *led;
> struct led_classdev *led_cdev;
> struct led_classdev_flash *flash;
> +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> + struct v4l2_flash_ctrl_config v4l2_flash_config;
> +#endif
> struct aat1290_led_settings settings;
> int flen_gpio, enset_gpio, ret;
>
> @@ -344,6 +389,9 @@ static int aat1290_led_probe(struct platform_device *pdev)
>
> flash->timeout = settings.flash_timeout;
>
> + /* Init V4L2 Flash controls basing on initialized settings */
> + aat1290_init_v4l2_ctrl_config(&settings, &v4l2_flash_config);
> +
> /* Init led class */
> led_cdev = &flash->led_cdev;
> led_cdev->name = led->label;
> @@ -361,8 +409,20 @@ static int aat1290_led_probe(struct platform_device *pdev)
> if (ret < 0)
> goto error_gpio_en_set;
>
> + /* Create V4L2 Flash subdev. */
> + led->v4l2_flash = v4l2_flash_init(flash,
> + get_v4l2_flash_ops(),
> + dev_node,
> + &v4l2_flash_config);

Less newlines needed; up to you.

> + 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(flash);
> error_gpio_en_set:
> if (gpio_is_valid(enset_gpio))
> gpio_free(enset_gpio);
> @@ -378,6 +438,7 @@ 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->ldev);
> cancel_work_sync(&led->work_brightness_set);
>

--
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi XMPP: sailus@retiisi.org.uk


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