8 #include <linux/input/mt.h>
24  * input_mt_init_slots() - initialize MT input slots
25  * @dev: input device supporting MT events and finger tracking
27  * @flags: mt tasks to handle in core
29  * This function allocates all necessary memory for MT slot handling
41 	struct input_mt *mt = dev->mt;  in input_mt_init_slots()  local
46 	if (mt)  in input_mt_init_slots()
47 		return mt->num_slots != num_slots ? -EINVAL : 0;  in input_mt_init_slots()
49 	mt = kzalloc(struct_size(mt, slots, num_slots), GFP_KERNEL);  in input_mt_init_slots()
50 	if (!mt)  in input_mt_init_slots()
53 	mt->num_slots = num_slots;  in input_mt_init_slots()
54 	mt->flags = flags;  in input_mt_init_slots()
83 		mt->red = kcalloc(n2, sizeof(*mt->red), GFP_KERNEL);  in input_mt_init_slots()
84 		if (!mt->red)  in input_mt_init_slots()
90 		input_mt_set_value(&mt->slots[i], ABS_MT_TRACKING_ID, -1);  in input_mt_init_slots()
93 	mt->frame = 1;  in input_mt_init_slots()
95 	dev->mt = mt;  in input_mt_init_slots()
98 	kfree(mt);  in input_mt_init_slots()
104  * input_mt_destroy_slots() - frees the MT slots of the input device
105  * @dev: input device with allocated MT slots
108  * automatically free the MT slots when the device is destroyed.
112 	if (dev->mt) {  in input_mt_destroy_slots()
113 		kfree(dev->mt->red);  in input_mt_destroy_slots()
114 		kfree(dev->mt);  in input_mt_destroy_slots()
116 	dev->mt = NULL;  in input_mt_destroy_slots()
122  * @dev: input device with allocated MT slots
137 	struct input_mt *mt = dev->mt;  in input_mt_report_slot_state()  local
141 	if (!mt)  in input_mt_report_slot_state()
144 	slot = &mt->slots[mt->slot];  in input_mt_report_slot_state()
145 	slot->frame = mt->frame;  in input_mt_report_slot_state()
154 		id = input_mt_new_trkid(mt);  in input_mt_report_slot_state()
165  * @dev: input device with allocated MT slots
186  * @dev: input device with allocated MT slots
197 	struct input_mt *mt = dev->mt;  in input_mt_report_pointer_emulation()  local
201 	if (!mt)  in input_mt_report_pointer_emulation()
205 	oldid = mt->trkid;  in input_mt_report_pointer_emulation()
208 	for (i = 0; i < mt->num_slots; ++i) {  in input_mt_report_pointer_emulation()
209 		struct input_mt_slot *ps = &mt->slots[i];  in input_mt_report_pointer_emulation()
258 static void __input_mt_drop_unused(struct input_dev *dev, struct input_mt *mt)  in __input_mt_drop_unused()  argument
262 	for (i = 0; i < mt->num_slots; i++) {  in __input_mt_drop_unused()
263 		if (!input_mt_is_used(mt, &mt->slots[i])) {  in __input_mt_drop_unused()
272  * @dev: input device with allocated MT slots
278 	struct input_mt *mt = dev->mt;  in input_mt_drop_unused()  local
280 	if (mt) {  in input_mt_drop_unused()
281 		__input_mt_drop_unused(dev, mt);  in input_mt_drop_unused()
282 		mt->frame++;  in input_mt_drop_unused()
288  * input_mt_sync_frame() - synchronize mt frame
289  * @dev: input device with allocated MT slots
297 	struct input_mt *mt = dev->mt;  in input_mt_sync_frame()  local
300 	if (!mt)  in input_mt_sync_frame()
303 	if (mt->flags & INPUT_MT_DROP_UNUSED)  in input_mt_sync_frame()
304 		__input_mt_drop_unused(dev, mt);  in input_mt_sync_frame()
306 	if ((mt->flags & INPUT_MT_POINTER) && !(mt->flags & INPUT_MT_SEMI_MT))  in input_mt_sync_frame()
311 	mt->frame++;  in input_mt_sync_frame()
363 static int input_mt_set_matrix(struct input_mt *mt,  in input_mt_set_matrix()  argument
369 	int *w = mt->red;  in input_mt_set_matrix()
372 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {  in input_mt_set_matrix()
383 	return w - mt->red;  in input_mt_set_matrix()
386 static void input_mt_set_slots(struct input_mt *mt,  in input_mt_set_slots()  argument
390 	int *w = mt->red, j;  in input_mt_set_slots()
395 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {  in input_mt_set_slots()
401 				slots[j] = s - mt->slots;  in input_mt_set_slots()
409 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {  in input_mt_set_slots()
415 				slots[j] = s - mt->slots;  in input_mt_set_slots()
424  * @dev: input device with allocated MT slots
444 	struct input_mt *mt = dev->mt;  in input_mt_assign_slots()  local
448 	if (!mt || !mt->red)  in input_mt_assign_slots()
450 	if (num_pos > mt->num_slots)  in input_mt_assign_slots()
455 	nrc = input_mt_set_matrix(mt, pos, num_pos, mu);  in input_mt_assign_slots()
456 	find_reduced_matrix(mt->red, num_pos, nrc / num_pos, nrc, mu);  in input_mt_assign_slots()
457 	input_mt_set_slots(mt, slots, num_pos);  in input_mt_assign_slots()
465  * @dev: input device with allocated MT slots
477 	struct input_mt *mt = dev->mt;  in input_mt_get_slot_by_key()  local
480 	if (!mt)  in input_mt_get_slot_by_key()
483 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++)  in input_mt_get_slot_by_key()
485 			return s - mt->slots;  in input_mt_get_slot_by_key()
487 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++)  in input_mt_get_slot_by_key()
488 		if (!input_mt_is_active(s) && !input_mt_is_used(mt, s)) {  in input_mt_get_slot_by_key()
490 			return s - mt->slots;  in input_mt_get_slot_by_key()