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Commit ba4d695a authored by Henrik Rydberg's avatar Henrik Rydberg Committed by Dmitry Torokhov
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Input: MT - initialize slots to unused 



For MT slots, the ABS_MT_TRACKING_ID determines whether a slot is in use,
but currently leaves initialization up to the drivers. This patch sets the
slot state to unused upon creation.

Signed-off-by: default avatarHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 2c4e9671

drivers/input/input.c

+9 −2
Original line number Diff line number Diff line
@@ -1599,11 +1599,14 @@ EXPORT_SYMBOL(input_free_device); 
 * @dev: input device supporting MT events and finger tracking

 * @num_slots: number of slots used by the device

 *

 * This function allocates all necessary memory for MT slot handling

 * in the input device, and adds ABS_MT_SLOT to the device capabilities.

 * This function allocates all necessary memory for MT slot handling in the

 * input device, and adds ABS_MT_SLOT to the device capabilities. All slots

 * are initially marked as unused iby setting ABS_MT_TRACKING_ID to -1.

 */

int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots)

{

	int i;



	if (!num_slots)

		return 0;
@@ -1614,6 +1617,10 @@ int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots) 
	dev->mtsize = num_slots;

	input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);



	/* Mark slots as 'unused' */

	for (i = 0; i < num_slots; i++)

		dev->mt[i].abs[ABS_MT_TRACKING_ID - ABS_MT_FIRST] = -1;



	return 0;

}

EXPORT_SYMBOL(input_mt_create_slots);