rfkill: Add support for KEY_RFKILL

Add support for handling KEY_RFKILL in the rfkill input module. This
simply toggles the state of all rfkill devices. The comment in rfkill.h
is also updated to reflect that RFKILL_TYPE_ALL may be used inside the
kernel.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/linux/rfkill.h

@@ -29,7 +29,7 @@
 /**
  * enum rfkill_type - type of rfkill switch.
  *
- * @RFKILL_TYPE_ALL: toggles all switches (userspace only)
+ * @RFKILL_TYPE_ALL: toggles all switches (requests only - not a switch type)
  * @RFKILL_TYPE_WLAN: switch is on a 802.11 wireless network device.
  * @RFKILL_TYPE_BLUETOOTH: switch is on a bluetooth device.
  * @RFKILL_TYPE_UWB: switch is on a ultra wideband device.

net/rfkill/input.c

@@ -212,6 +212,9 @@ static void rfkill_event(struct input_handle *handle, unsigned int type,
 		case KEY_WIMAX:
 			rfkill_schedule_toggle(RFKILL_TYPE_WIMAX);
 			break;
+		case KEY_RFKILL:
+			rfkill_schedule_toggle(RFKILL_TYPE_ALL);
+			break;
 		}
 	} else if (type == EV_SW && code == SW_RFKILL_ALL)
 		rfkill_schedule_evsw_rfkillall(data);
@@ -294,6 +297,11 @@ static const struct input_device_id rfkill_ids[] = {
 		.evbit = { BIT_MASK(EV_KEY) },
 		.keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
 	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(KEY_RFKILL)] = BIT_MASK(KEY_RFKILL) },
+	},
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
 		.evbit = { BIT(EV_SW) },