linux-kernel - Re: [PATCH v3 1/2] platform/x86: asus-wmi: Call led hw

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Message-ID: <CAB4CAwdCixoGj9t=1Nvcc52kAjmcMWobKt11pRa0vNyLdeA_rg@mail.gmail.com>
Date:   Wed, 27 Jun 2018 18:27:43 +0800
From:   Chris Chiu <chiu@...lessm.com>
To:     Corentin Chary <corentin.chary@...il.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        acpi4asus-user <acpi4asus-user@...ts.sourceforge.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Linux Upstreaming Team <linux@...lessm.com>,
        Chris Chiu <chiu@...lessm.com>
Subject: Re: [PATCH v3 1/2] platform/x86: asus-wmi: Call led hw_changed API on
 kbd brightness change

On Wed, Jun 20, 2018 at 10:46 PM, Chris Chiu <chiu@...lessm.com> wrote:
> Make asus-wmi notify on hotkey kbd brightness changes, listen for
> brightness events and update the brightness directly in the driver.
> Create new do_kbd_led_set function for in-driver update, and leave
> kbd_led_set for original led_classdev call path.
>
> Update the brightness by led_classdev_notify_brightness_hw_changed.
> This will allow userspace to monitor (poll) for brightness changes
> on the LED without reporting via input keymapping.
>
> Signed-off-by: Chris Chiu <chiu@...lessm.com>
> ---
>  drivers/platform/x86/asus-wmi.c | 26 ++++++++++++++++++++++----
>  1 file changed, 22 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 1f6e68f0b646..f2b9037f6ded 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -460,6 +460,7 @@ static void kbd_led_update(struct work_struct *work)
>                 ctrl_param = 0x80 | (asus->kbd_led_wk & 0x7F);
>
>         asus_wmi_set_devstate(ASUS_WMI_DEVID_KBD_BACKLIGHT, ctrl_param, NULL);
> +       led_classdev_notify_brightness_hw_changed(&asus->kbd_led, asus->kbd_led_wk);
>  }
>
>  static int kbd_led_read(struct asus_wmi *asus, int *level, int *env)
> @@ -490,15 +491,16 @@ static int kbd_led_read(struct asus_wmi *asus, int *level, int *env)
>         return retval;
>  }
>
> -static void kbd_led_set(struct led_classdev *led_cdev,
> -                       enum led_brightness value)
> +static void do_kbd_led_set(struct led_classdev *led_cdev, int value)
>  {
>         struct asus_wmi *asus;
> +       int max_level;
>
>         asus = container_of(led_cdev, struct asus_wmi, kbd_led);
> +       max_level = asus->kbd_led.max_brightness;
>
> -       if (value > asus->kbd_led.max_brightness)
> -               value = asus->kbd_led.max_brightness;
> +       if (value > max_level)
> +               value = max_level;
>         else if (value < 0)
>                 value = 0;
>
> @@ -506,6 +508,12 @@ static void kbd_led_set(struct led_classdev *led_cdev,
>         queue_work(asus->led_workqueue, &asus->kbd_led_work);
>  }
>
> +static void kbd_led_set(struct led_classdev *led_cdev,
> +                       enum led_brightness value)
> +{
> +       do_kbd_led_set(led_cdev, value);
> +}
> +
>  static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
>  {
>         struct asus_wmi *asus;
> @@ -656,6 +664,7 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
>
>                 asus->kbd_led_wk = led_val;
>                 asus->kbd_led.name = "asus::kbd_backlight";
> +               asus->kbd_led.flags = LED_BRIGHT_HW_CHANGED;
>                 asus->kbd_led.brightness_set = kbd_led_set;
>                 asus->kbd_led.brightness_get = kbd_led_get;
>                 asus->kbd_led.max_brightness = 3;
> @@ -1745,6 +1754,15 @@ static void asus_wmi_notify(u32 value, void *context)
>                 }
>         }
>
> +       if (code == NOTIFY_KBD_BRTUP) {
> +               do_kbd_led_set(&asus->kbd_led, asus->kbd_led_wk + 1);
> +               goto exit;
> +       }
> +       if (code == NOTIFY_KBD_BRTDWN) {
> +               do_kbd_led_set(&asus->kbd_led, asus->kbd_led_wk - 1);
> +               goto exit;
> +       }
> +
>         if (is_display_toggle(code) &&
>             asus->driver->quirks->no_display_toggle)
>                 goto exit;
> --
> 2.11.0
>

Gentle ping. Any comment for the v3 patch?

Chris