sony-laptop: add AVMode key mapping

Some models are equipped with an "AVMode" function key that sends
  sony-laptop: Unknown event: 0x100 0xa1
  sony-laptop: Unknown event: 0x100 0x21
for press and release respectively.

Cc: "Matthew W. S. Bell" <matthew@bells23.org.uk>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index a2a742c..9710f70 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -232,6 +232,7 @@
 	56,	/* 69 SONYPI_EVENT_VOLUME_INC_PRESSED */
 	57,	/* 70 SONYPI_EVENT_VOLUME_DEC_PRESSED */
 	-1,	/* 71 SONYPI_EVENT_BRIGHTNESS_PRESSED */
+	58,	/* 72 SONYPI_EVENT_MEDIA_PRESSED */
 };
 
 static int sony_laptop_input_keycode_map[] = {
@@ -293,6 +294,7 @@
 	KEY_F15,	/* 55 SONYPI_EVENT_SETTINGKEY_PRESSED */
 	KEY_VOLUMEUP,	/* 56 SONYPI_EVENT_VOLUME_INC_PRESSED */
 	KEY_VOLUMEDOWN,	/* 57 SONYPI_EVENT_VOLUME_DEC_PRESSED */
+	KEY_MEDIA,	/* 58 SONYPI_EVENT_MEDIA_PRESSED */
 };
 
 /* release buttons after a short delay if pressed */
@@ -890,6 +892,8 @@
 	{ 0x0C, SONYPI_EVENT_FNKEY_RELEASED },
 	{ 0x9f, SONYPI_EVENT_CD_EJECT_PRESSED },
 	{ 0x1f, SONYPI_EVENT_ANYBUTTON_RELEASED },
+	{ 0xa1, SONYPI_EVENT_MEDIA_PRESSED },
+	{ 0x21, SONYPI_EVENT_ANYBUTTON_RELEASED },
 	{ 0, 0 },
 };