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Date: Tue, 22 Sep 2015 09:42:04 +0300
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Jacek Anaszewski <j.anaszewski@...sung.com>,
linux-leds@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, andrew@...n.ch
Subject: Re: [PATCH 1/5] leds: core: Drivers shouldn't enforce SYNC/ASYNC
brightness setting
Hi Jacek,
Thanks for the patchset. A few comments below.
Jacek Anaszewski wrote:
> This patch removes SET_BRIGHTNESS_ASYNC and SET_BRIGHTNESS flags.
> led_set_brightness now calls led_set_brightness_nosleep instead of
> choosing between sync and async op basing on the flags defined by the
> driver.
>
> From now on, if a user wants to make sure that brightness will be set
> synchronously, they have to use led_set_brightness_sync API. It is now
> being made publicly available since it has become apparent that it is
> a caller who should decide whether brightness is to be set in
> a synchronous or an asynchronous way.
>
> Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
> ---
> drivers/leds/led-class-flash.c | 4 ----
> drivers/leds/led-class.c | 2 --
> drivers/leds/led-core.c | 33 +++++++++++++++++++--------------
> drivers/leds/leds.h | 13 -------------
> include/linux/leds.h | 19 ++++++++++++++++---
> 5 files changed, 35 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/leds/led-class-flash.c b/drivers/leds/led-class-flash.c
> index 300a2c9..f53783b 100644
> --- a/drivers/leds/led-class-flash.c
> +++ b/drivers/leds/led-class-flash.c
> @@ -316,10 +316,6 @@ int led_classdev_flash_register(struct device *parent,
> if (ret < 0)
> return ret;
>
> - /* Setting a torch brightness needs to have immediate effect */
> - led_cdev->flags &= ~SET_BRIGHTNESS_ASYNC;
> - led_cdev->flags |= SET_BRIGHTNESS_SYNC;
> -
> return 0;
> }
> EXPORT_SYMBOL_GPL(led_classdev_flash_register);
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 7385f98..37eec1a 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -215,8 +215,6 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
> if (!led_cdev->max_brightness)
> led_cdev->max_brightness = LED_FULL;
>
> - led_cdev->flags |= SET_BRIGHTNESS_ASYNC;
> -
> led_update_brightness(led_cdev);
>
> led_init_core(led_cdev);
> diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
> index d8649f1..d0eb838 100644
> --- a/drivers/leds/led-core.c
> +++ b/drivers/leds/led-core.c
> @@ -215,8 +215,6 @@ EXPORT_SYMBOL_GPL(led_stop_software_blink);
> void led_set_brightness(struct led_classdev *led_cdev,
> enum led_brightness brightness)
> {
> - int ret = 0;
> -
> /*
> * In case blinking is on delay brightness setting
> * until the next timer tick.
> @@ -235,19 +233,9 @@ void led_set_brightness(struct led_classdev *led_cdev,
> led_cdev->blink_brightness = brightness;
> }
> return;
> - }
> -
> - if (led_cdev->flags & SET_BRIGHTNESS_ASYNC) {
> + } else {
Useless use of else.
> led_set_brightness_nosleep(led_cdev, brightness);
> - return;
> - } else if (led_cdev->flags & SET_BRIGHTNESS_SYNC)
> - ret = led_set_brightness_sync(led_cdev, brightness);
> - else
> - ret = -EINVAL;
> -
> - if (ret < 0)
> - dev_dbg(led_cdev->dev, "Setting LED brightness failed (%d)\n",
> - ret);
> + }
> }
> EXPORT_SYMBOL(led_set_brightness);
>
> @@ -269,6 +257,23 @@ void led_set_brightness_nosleep(struct led_classdev *led_cdev,
> }
> EXPORT_SYMBOL(led_set_brightness_nosleep);
>
> +int led_set_brightness_sync(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + WARN_ON(led_cdev->blink_delay_on || led_cdev->blink_delay_off);
How about simply returning an error instead?
> +
> + led_cdev->brightness = min(value, led_cdev->max_brightness);
> +
> + if (led_cdev->flags & LED_SUSPENDED)
> + return 0;
> +
> + if (led_cdev->brightness_set_blocking)
> + return led_cdev->brightness_set_blocking(led_cdev,
> + led_cdev->brightness);
> + return -EINVAL;
> +}
> +EXPORT_SYMBOL(led_set_brightness_sync);
> +
> int led_update_brightness(struct led_classdev *led_cdev)
> {
> int ret = 0;
> diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
> index 04b8e41..62d9eba 100644
> --- a/drivers/leds/leds.h
> +++ b/drivers/leds/leds.h
> @@ -16,19 +16,6 @@
> #include <linux/rwsem.h>
> #include <linux/leds.h>
>
> -static inline int led_set_brightness_sync(struct led_classdev *led_cdev,
> - enum led_brightness value)
> -{
> - int ret = 0;
> -
> - led_cdev->brightness = min(value, led_cdev->max_brightness);
> -
> - if (!(led_cdev->flags & LED_SUSPENDED))
> - ret = led_cdev->brightness_set_blocking(led_cdev,
> - led_cdev->brightness);
> - return ret;
> -}
> -
> static inline int led_get_brightness(struct led_classdev *led_cdev)
> {
> return led_cdev->brightness;
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index ae3c178..2019929 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -47,9 +47,7 @@ struct led_classdev {
> #define LED_BLINK_CHANGE (1 << 20)
> #define LED_BLINK_DISABLE (1 << 21)
> #define LED_SYSFS_DISABLE (1 << 22)
> -#define SET_BRIGHTNESS_ASYNC (1 << 23)
> -#define SET_BRIGHTNESS_SYNC (1 << 24)
> -#define LED_DEV_CAP_FLASH (1 << 25)
> +#define LED_DEV_CAP_FLASH (1 << 23)
>
> /* Set LED brightness level */
> /* Must not sleep, use a workqueue if needed */
> @@ -159,6 +157,21 @@ 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_set_brightness_sync - set LED brightness synchronously
> + * @led_cdev: the LED to set
> + * @brightness: the brightness to set it to
> + *
> + * Set an LED's brightness immediately. This function will block
> + * the caller for the time required for accessing device register,
> + * and it can sleep.
> + *
> + * Returns: 0 on success or negative error value on failure
> + */
> +extern int led_set_brightness_sync(struct led_classdev *led_cdev,
> + enum led_brightness value);
> +
> /**
> * led_update_brightness - update LED brightness
> * @led_cdev: the LED to query
>
--
Kind regards,
Sakari Ailus
sakari.ailus@...ux.intel.com
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