264 	struct mousedev_client *client;  in mousedev_notify_readers()  local
270 	list_for_each_entry_rcu(client, &mousedev->client_list, node) {  in mousedev_notify_readers()
273 		spin_lock(&client->packet_lock);  in mousedev_notify_readers()
275 		p = &client->packets[client->head];  in mousedev_notify_readers()
276 		if (client->ready && p->buttons != mousedev->packet.buttons) {  in mousedev_notify_readers()
277 			new_head = (client->head + 1) % PACKET_QUEUE_LEN;  in mousedev_notify_readers()
278 			if (new_head != client->tail) {  in mousedev_notify_readers()
279 				p = &client->packets[client->head = new_head];  in mousedev_notify_readers()
285 			p->dx += packet->x - client->pos_x;  in mousedev_notify_readers()
286 			p->dy += packet->y - client->pos_y;  in mousedev_notify_readers()
287 			client->pos_x = packet->x;  in mousedev_notify_readers()
288 			client->pos_y = packet->y;  in mousedev_notify_readers()
291 		client->pos_x += packet->dx;  in mousedev_notify_readers()
292 		client->pos_x = clamp_val(client->pos_x, 0, xres);  in mousedev_notify_readers()
294 		client->pos_y += packet->dy;  in mousedev_notify_readers()
295 		client->pos_y = clamp_val(client->pos_y, 0, yres);  in mousedev_notify_readers()
303 		    p->buttons != client->last_buttons)  in mousedev_notify_readers()
304 			client->ready = 1;  in mousedev_notify_readers()
306 		spin_unlock(&client->packet_lock);  in mousedev_notify_readers()
308 		if (client->ready) {  in mousedev_notify_readers()
309 			kill_fasync(&client->fasync, SIGIO, POLL_IN);  in mousedev_notify_readers()
406 	struct mousedev_client *client = file->private_data;  in mousedev_fasync()  local
408 	return fasync_helper(fd, file, on, &client->fasync);  in mousedev_fasync()
504 				   struct mousedev_client *client)  in mousedev_attach_client()  argument
507 	list_add_tail_rcu(&client->node, &mousedev->client_list);  in mousedev_attach_client()
512 				   struct mousedev_client *client)  in mousedev_detach_client()  argument
515 	list_del_rcu(&client->node);  in mousedev_detach_client()
522 	struct mousedev_client *client = file->private_data;  in mousedev_release()  local
523 	struct mousedev *mousedev = client->mousedev;  in mousedev_release()
525 	mousedev_detach_client(mousedev, client);  in mousedev_release()
526 	kfree(client);  in mousedev_release()
535 	struct mousedev_client *client;  in mousedev_open()  local
546 	client = kzalloc_obj(struct mousedev_client);  in mousedev_open()
547 	if (!client)  in mousedev_open()
550 	spin_lock_init(&client->packet_lock);  in mousedev_open()
551 	client->pos_x = xres / 2;  in mousedev_open()
552 	client->pos_y = yres / 2;  in mousedev_open()
553 	client->mousedev = mousedev;  in mousedev_open()
554 	mousedev_attach_client(mousedev, client);  in mousedev_open()
560 	file->private_data = client;  in mousedev_open()
566 	mousedev_detach_client(mousedev, client);  in mousedev_open()
567 	kfree(client);  in mousedev_open()
571 static void mousedev_packet(struct mousedev_client *client, u8 *ps2_data)  in mousedev_packet()  argument
573 	struct mousedev_motion *p = &client->packets[client->tail];  in mousedev_packet()
588 	switch (client->mode) {  in mousedev_packet()
594 		client->bufsiz = 4;  in mousedev_packet()
605 		client->bufsiz = 4;  in mousedev_packet()
615 		client->bufsiz = 3;  in mousedev_packet()
620 		if (client->tail == client->head) {  in mousedev_packet()
621 			client->ready = 0;  in mousedev_packet()
622 			client->last_buttons = p->buttons;  in mousedev_packet()
624 			client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;  in mousedev_packet()
628 static void mousedev_generate_response(struct mousedev_client *client,  in mousedev_generate_response()  argument
631 	client->ps2[0] = 0xfa; /* ACK */  in mousedev_generate_response()
636 		mousedev_packet(client, &client->ps2[1]);  in mousedev_generate_response()
637 		client->bufsiz++; /* account for leading ACK */  in mousedev_generate_response()
641 		switch (client->mode) {  in mousedev_generate_response()
643 			client->ps2[1] = 0;  in mousedev_generate_response()
646 			client->ps2[1] = 3;  in mousedev_generate_response()
649 			client->ps2[1] = 4;  in mousedev_generate_response()
652 		client->bufsiz = 2;  in mousedev_generate_response()
656 		client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;  in mousedev_generate_response()
657 		client->bufsiz = 4;  in mousedev_generate_response()
661 		client->impsseq = client->imexseq = 0;  in mousedev_generate_response()
662 		client->mode = MOUSEDEV_EMUL_PS2;  in mousedev_generate_response()
663 		client->ps2[1] = 0xaa; client->ps2[2] = 0x00;  in mousedev_generate_response()
664 		client->bufsiz = 3;  in mousedev_generate_response()
668 		client->bufsiz = 1;  in mousedev_generate_response()
671 	client->buffer = client->bufsiz;  in mousedev_generate_response()
677 	struct mousedev_client *client = file->private_data;  in mousedev_write()  local
686 		spin_lock_irq(&client->packet_lock);  in mousedev_write()
688 		if (c == mousedev_imex_seq[client->imexseq]) {  in mousedev_write()
689 			if (++client->imexseq == MOUSEDEV_SEQ_LEN) {  in mousedev_write()
690 				client->imexseq = 0;  in mousedev_write()
691 				client->mode = MOUSEDEV_EMUL_EXPS;  in mousedev_write()
694 			client->imexseq = 0;  in mousedev_write()
696 		if (c == mousedev_imps_seq[client->impsseq]) {  in mousedev_write()
697 			if (++client->impsseq == MOUSEDEV_SEQ_LEN) {  in mousedev_write()
698 				client->impsseq = 0;  in mousedev_write()
699 				client->mode = MOUSEDEV_EMUL_IMPS;  in mousedev_write()
702 			client->impsseq = 0;  in mousedev_write()
704 		mousedev_generate_response(client, c);  in mousedev_write()
706 		spin_unlock_irq(&client->packet_lock);  in mousedev_write()
710 	kill_fasync(&client->fasync, SIGIO, POLL_IN);  in mousedev_write()
711 	wake_up_interruptible(&client->mousedev->wait);  in mousedev_write()
719 	struct mousedev_client *client = file->private_data;  in mousedev_read()  local
720 	struct mousedev *mousedev = client->mousedev;  in mousedev_read()
721 	u8 data[sizeof(client->ps2)];  in mousedev_read()
724 	if (!client->ready && !client->buffer && mousedev->exist &&  in mousedev_read()
729 			!mousedev->exist || client->ready || client->buffer);  in mousedev_read()
736 	spin_lock_irq(&client->packet_lock);  in mousedev_read()
738 	if (!client->buffer && client->ready) {  in mousedev_read()
739 		mousedev_packet(client, client->ps2);  in mousedev_read()
740 		client->buffer = client->bufsiz;  in mousedev_read()
743 	if (count > client->buffer)  in mousedev_read()
744 		count = client->buffer;  in mousedev_read()
746 	memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);  in mousedev_read()
747 	client->buffer -= count;  in mousedev_read()
749 	spin_unlock_irq(&client->packet_lock);  in mousedev_read()
760 	struct mousedev_client *client = file->private_data;  in mousedev_poll()  local
761 	struct mousedev *mousedev = client->mousedev;  in mousedev_poll()
767 	if (client->ready || client->buffer)  in mousedev_poll()
802 	struct mousedev_client *client;  in mousedev_hangup()  local
805 	list_for_each_entry(client, &mousedev->client_list, node)  in mousedev_hangup()
806 		kill_fasync(&client->fasync, SIGIO, POLL_HUP);  in mousedev_hangup()