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Subject[PATCH v2 2/2] platform/x86: asus-wmi: Add keyboard backlight toggle support
Date
Some ASUS laptops like UX550GE has hotkey (Fn+F7) for keyboard
backlight toggle which would emit the scan code 0xc7 each keypress.
On the UX550GE, the max keyboard brightness level is 3 so the
toggle would not be simply on/off the led but need to be cyclic.
Per ASUS spec, it should increment the brightness for each keypress,
then toggle(off) the LED when it already reached the max level.

Signed-off-by: Chris Chiu <chiu@endlessm.com>
---
drivers/platform/x86/asus-wmi.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index a18484f4bae3..bfcafca54a7a 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -67,6 +67,7 @@ MODULE_LICENSE("GPL");
#define NOTIFY_BRNDOWN_MAX 0x2e
#define NOTIFY_KBD_BRTUP 0xc4
#define NOTIFY_KBD_BRTDWN 0xc5
+#define NOTIFY_KBD_BRTTOGGLE 0xc7

/* WMI Methods */
#define ASUS_WMI_METHODID_SPEC 0x43455053 /* BIOS SPECification */
@@ -1755,6 +1756,13 @@ static void asus_wmi_notify(u32 value, void *context)
kbd_led_set(&asus->kbd_led, asus->kbd_led_wk - 1);
goto exit;
}
+ if (code == NOTIFY_KBD_BRTTOGGLE) {
+ if (asus->kbd_led_wk == asus->kbd_led.max_brightness)
+ kbd_led_set(&asus->kbd_led, 0);
+ else
+ kbd_led_set(&asus->kbd_led, asus->kbd_led_wk + 1);
+ goto exit;
+ }

if (is_display_toggle(code) &&
asus->driver->quirks->no_display_toggle)
--
2.11.0
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