Hi Jacek,
On Thu, Mar 20, 2014 at 03:51:04PM +0100, Jacek Anaszewski wrote:
> led_update_brightness helper function used to be exploited
> only locally in the led-class.c module, where its result was
> being passed to the brightness_show sysfs callback. With the
> introduction of v4l2-flash subdevice the same functionality
> became required for checking the current flash strobe status.
> This patch adds checking brightness_get callback error code
> and adds the function to the LED subsystem public API.
>
> Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
> Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> Cc: Bryan Wu <cooloney@xxxxxxxxx>
> Cc: Richard Purdie <rpurdie@xxxxxxxxx>
> ---
> drivers/leds/led-class.c | 6 ------
> drivers/leds/led-core.c | 17 +++++++++++++++++
> include/linux/leds.h | 10 ++++++++++
> 3 files changed, 27 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 0510532..04de352 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -27,12 +27,6 @@
>
> static struct class *leds_class;
>
> -static void led_update_brightness(struct led_classdev *led_cdev)
> -{
> - if (led_cdev->brightness_get)
> - led_cdev->brightness = led_cdev->brightness_get(led_cdev);
> -}
> -
> static ssize_t brightness_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
> index 093703c..21ceda1 100644
> --- a/drivers/leds/led-core.c
> +++ b/drivers/leds/led-core.c
> @@ -166,6 +166,23 @@ void led_set_brightness(struct led_classdev *led_cdev,
> }
> EXPORT_SYMBOL(led_set_brightness);
>
> +int led_update_brightness(struct led_classdev *led_cdev)
> +{
> + int ret;
> +
> + if (led_cdev->brightness_get == NULL)
> + return -EINVAL;
> +
> + ret = led_cdev->brightness_get(led_cdev);
> + if (ret >= 0)
> + led_cdev->brightness = ret;
> + else
> + return ret;
You don't really need the else branch here. It'd be cleaner without, I
think.
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(led_update_brightness);
> +
> int led_set_flash_mode(struct led_classdev *led_cdev,
> bool flash_mode)
> {
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index 1bf0ab3..5bf05cc 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -190,6 +190,16 @@ extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
> extern void led_set_brightness(struct led_classdev *led_cdev,
> enum led_brightness brightness);
> /**
> + * led_update_brightness - update LED brightness
> + * @led_cdev: the LED to query about
> + *
> + * Get an LED's current brightness and update led_cdev->brightness
> + * member with the obtained value.
> + *
> + * Returns: 0 on success or negative error value on failure
> + */
> +extern int led_update_brightness(struct led_classdev *led_cdev);
> +
> /**
> * led_set_flash_mode - set LED flash mode
> * @led_cdev: the LED to set
--
Regards,
Sakari Ailus
e-mail: sakari.ailus@xxxxxx XMPP: sailus@xxxxxxxxxxxxxx
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