[PATCH v3 1/2] platform/x86: asus-wmi: Call led hw_changed API on kbd brightness change

[Chris Chiu]

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 <c...@endlessm.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