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platform/x86: asus-wmi: Add keyboard backlight toggle support

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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>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Chris Chiu 2018-06-20 22:46:45 +08:00 committed by Andy Shevchenko
parent dbb3d78f61
commit ed99d29b2b
1 changed files with 8 additions and 0 deletions
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8
drivers/platform/x86/asus-wmi.c
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@ -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 */
@ -1775,6 +1776,13 @@ static void asus_wmi_notify(u32 value, void *context)
do_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)
do_kbd_led_set(&asus->kbd_led, 0);
else
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)