From ed99d29b2b1562e5173953a5ea8b7861a4f29e2c Mon Sep 17 00:00:00 2001
From: Chris Chiu <chiu@endlessm.com>
Date: Wed, 20 Jun 2018 22:46:45 +0800
Subject: [PATCH] platform/x86: asus-wmi: Add keyboard backlight toggle support
Git-commit: ed99d29b2b1562e5173953a5ea8b7861a4f29e2c
Patch-mainline: v4.19-rc1
References: bsc#1126285

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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 3944e065ab77..34dcc1aac4ea 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 */
@@ -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)
-- 
2.16.4