Input: bcm5974 - add BTN_TOUCH event for mousedev benefit

The mousedev driver requires the use of BTN_TOUCH events to process
ABS_X and ABS_Y events properly, which is what is needed for the
bcm5974-based apple computers to have a functional pointer out-of-the-box.
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/mouse/bcm5974.c

@@ -253,6 +253,7 @@ static void setup_events_to_report(struct input_dev *input_dev,
 				0, cfg->y.dim, cfg->y.fuzz, 0);
 
 	__set_bit(EV_KEY, input_dev->evbit);
+	__set_bit(BTN_TOUCH, input_dev->keybit);
 	__set_bit(BTN_TOOL_FINGER, input_dev->keybit);
 	__set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
 	__set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
@@ -320,6 +321,7 @@ static int report_tp_state(struct bcm5974 *dev, int size)
 	if (dev->fingers > nmax)
 		dev->fingers = nmax;
 
+	input_report_key(input, BTN_TOUCH, dev->fingers > 0);
 	input_report_key(input, BTN_TOOL_FINGER, dev->fingers == 1);
 	input_report_key(input, BTN_TOOL_DOUBLETAP, dev->fingers == 2);
 	input_report_key(input, BTN_TOOL_TRIPLETAP, dev->fingers > 2);