2 files changed, 12 insertions, 1 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 26c5b117df2..7bd829f247e 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -3186,8 +3186,17 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
                 KEY_VENDOR,     /* 0x17: Thinkpad/AccessIBM/Lenovo */
 
                 /* (assignments unknown, please report if found) */
+                KEY_UNKNOWN, KEY_UNKNOWN,
+
+                /*
+                 * The mic mute button only sends 0x1a.  It does not
+                 * automatically mute the mic or change the mute light.
+                 */
+                KEY_MICMUTE,    /* 0x1a: Mic mute (since ?400 or so) */
+
+                /* (assignments unknown, please report if found) */
                 KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
-                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
+                KEY_UNKNOWN,
                 },
         };
 
diff --git a/include/linux/input.h b/include/linux/input.h
index 068784e1797..a637e781433 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -438,6 +438,8 @@ struct input_keymap_entry {
 #define KEY_WIMAX               246
 #define KEY_RFKILL              247     /* Key that controls all radios */
 
+#define KEY_MICMUTE             248     /* Mute / unmute the microphone */
+
 /* Code 255 is reserved for special needs of AT keyboard driver */
 
 #define BTN_MISC                0x100