8 #include <linux/input/mt.h>
25  * input_mt_init_slots() - initialize MT input slots
26  * @dev: input device supporting MT events and finger tracking
28  * @flags: mt tasks to handle in core
30  * This function allocates all necessary memory for MT slot handling
45 	if (dev->mt)  in input_mt_init_slots()
46 		return dev->mt->num_slots != num_slots ? -EINVAL : 0;  in input_mt_init_slots()
52 	struct input_mt *mt __free(kfree) =  in input_mt_init_slots()
53 			kzalloc(struct_size(mt, slots, num_slots), GFP_KERNEL);  in input_mt_init_slots()
54 	if (!mt)  in input_mt_init_slots()
57 	mt->num_slots = num_slots;  in input_mt_init_slots()
58 	mt->flags = flags;  in input_mt_init_slots()
87 		mt->red = kcalloc(n2, sizeof(*mt->red), GFP_KERNEL);  in input_mt_init_slots()
88 		if (!mt->red)  in input_mt_init_slots()
94 		input_mt_set_value(&mt->slots[i], ABS_MT_TRACKING_ID, -1);  in input_mt_init_slots()
97 	mt->frame = 1;  in input_mt_init_slots()
99 	dev->mt = no_free_ptr(mt);  in input_mt_init_slots()
105  * input_mt_destroy_slots() - frees the MT slots of the input device
106  * @dev: input device with allocated MT slots
109  * automatically free the MT slots when the device is destroyed.
113 	if (dev->mt) {  in input_mt_destroy_slots()
114 		kfree(dev->mt->red);  in input_mt_destroy_slots()
115 		kfree(dev->mt);  in input_mt_destroy_slots()
117 	dev->mt = NULL;  in input_mt_destroy_slots()
123  * @dev: input device with allocated MT slots
138 	struct input_mt *mt = dev->mt;  in input_mt_report_slot_state()  local
142 	if (!mt)  in input_mt_report_slot_state()
145 	slot = &mt->slots[mt->slot];  in input_mt_report_slot_state()
146 	slot->frame = mt->frame;  in input_mt_report_slot_state()
155 		id = input_mt_new_trkid(mt);  in input_mt_report_slot_state()
166  * @dev: input device with allocated MT slots
187  * @dev: input device with allocated MT slots
198 	struct input_mt *mt = dev->mt;  in input_mt_report_pointer_emulation()  local
202 	if (!mt)  in input_mt_report_pointer_emulation()
206 	oldid = mt->trkid;  in input_mt_report_pointer_emulation()
209 	for (i = 0; i < mt->num_slots; ++i) {  in input_mt_report_pointer_emulation()
210 		struct input_mt_slot *ps = &mt->slots[i];  in input_mt_report_pointer_emulation()
259 static void __input_mt_drop_unused(struct input_dev *dev, struct input_mt *mt)  in __input_mt_drop_unused()  argument
265 	for (i = 0; i < mt->num_slots; i++) {  in __input_mt_drop_unused()
266 		if (input_mt_is_active(&mt->slots[i]) &&  in __input_mt_drop_unused()
267 		    !input_mt_is_used(mt, &mt->slots[i])) {  in __input_mt_drop_unused()
276  * @dev: input device with allocated MT slots
282 	struct input_mt *mt = dev->mt;  in input_mt_drop_unused()  local
284 	if (mt) {  in input_mt_drop_unused()
287 		__input_mt_drop_unused(dev, mt);  in input_mt_drop_unused()
288 		mt->frame++;  in input_mt_drop_unused()
295  * @dev: input device with allocated MT slots
301 	struct input_mt *mt = dev->mt;  in input_mt_release_slots()  local
305 	if (mt) {  in input_mt_release_slots()
307 		mt->frame++;  in input_mt_release_slots()
309 		__input_mt_drop_unused(dev, mt);  in input_mt_release_slots()
314 		mt->frame++;  in input_mt_release_slots()
319  * input_mt_sync_frame() - synchronize mt frame
320  * @dev: input device with allocated MT slots
328 	struct input_mt *mt = dev->mt;  in input_mt_sync_frame()  local
331 	if (!mt)  in input_mt_sync_frame()
334 	if (mt->flags & INPUT_MT_DROP_UNUSED) {  in input_mt_sync_frame()
336 		__input_mt_drop_unused(dev, mt);  in input_mt_sync_frame()
339 	if ((mt->flags & INPUT_MT_POINTER) && !(mt->flags & INPUT_MT_SEMI_MT))  in input_mt_sync_frame()
344 	mt->frame++;  in input_mt_sync_frame()
396 static int input_mt_set_matrix(struct input_mt *mt,  in input_mt_set_matrix()  argument
402 	int *w = mt->red;  in input_mt_set_matrix()
405 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {  in input_mt_set_matrix()
416 	return w - mt->red;  in input_mt_set_matrix()
419 static void input_mt_set_slots(struct input_mt *mt,  in input_mt_set_slots()  argument
423 	int *w = mt->red, j;  in input_mt_set_slots()
428 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {  in input_mt_set_slots()
434 				slots[j] = s - mt->slots;  in input_mt_set_slots()
442 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {  in input_mt_set_slots()
448 				slots[j] = s - mt->slots;  in input_mt_set_slots()
457  * @dev: input device with allocated MT slots
477 	struct input_mt *mt = dev->mt;  in input_mt_assign_slots()  local
481 	if (!mt || !mt->red)  in input_mt_assign_slots()
483 	if (num_pos > mt->num_slots)  in input_mt_assign_slots()
488 	nrc = input_mt_set_matrix(mt, pos, num_pos, mu);  in input_mt_assign_slots()
489 	find_reduced_matrix(mt->red, num_pos, nrc / num_pos, nrc, mu);  in input_mt_assign_slots()
490 	input_mt_set_slots(mt, slots, num_pos);  in input_mt_assign_slots()
498  * @dev: input device with allocated MT slots
510 	struct input_mt *mt = dev->mt;  in input_mt_get_slot_by_key()  local
513 	if (!mt)  in input_mt_get_slot_by_key()
516 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++)  in input_mt_get_slot_by_key()
518 			return s - mt->slots;  in input_mt_get_slot_by_key()
520 	for (s = mt->slots; s != mt->slots + mt->num_slots; s++)  in input_mt_get_slot_by_key()
521 		if (!input_mt_is_active(s) && !input_mt_is_used(mt, s)) {  in input_mt_get_slot_by_key()
523 			return s - mt->slots;  in input_mt_get_slot_by_key()