266 	struct mousedev_client *client;  in mousedev_notify_readers()  local
272 	list_for_each_entry_rcu(client, &mousedev->client_list, node) {  in mousedev_notify_readers()
275 		spin_lock(&client->packet_lock);  in mousedev_notify_readers()
277 		p = &client->packets[client->head];  in mousedev_notify_readers()
278 		if (client->ready && p->buttons != mousedev->packet.buttons) {  in mousedev_notify_readers()
279 			new_head = (client->head + 1) % PACKET_QUEUE_LEN;  in mousedev_notify_readers()
280 			if (new_head != client->tail) {  in mousedev_notify_readers()
281 				p = &client->packets[client->head = new_head];  in mousedev_notify_readers()
287 			p->dx += packet->x - client->pos_x;  in mousedev_notify_readers()
288 			p->dy += packet->y - client->pos_y;  in mousedev_notify_readers()
289 			client->pos_x = packet->x;  in mousedev_notify_readers()
290 			client->pos_y = packet->y;  in mousedev_notify_readers()
293 		client->pos_x += packet->dx;  in mousedev_notify_readers()
294 		client->pos_x = client->pos_x < 0 ?  in mousedev_notify_readers()
295 			0 : (client->pos_x >= xres ? xres : client->pos_x);  in mousedev_notify_readers()
296 		client->pos_y += packet->dy;  in mousedev_notify_readers()
297 		client->pos_y = client->pos_y < 0 ?  in mousedev_notify_readers()
298 			0 : (client->pos_y >= yres ? yres : client->pos_y);  in mousedev_notify_readers()
306 		    p->buttons != client->last_buttons)  in mousedev_notify_readers()
307 			client->ready = 1;  in mousedev_notify_readers()
309 		spin_unlock(&client->packet_lock);  in mousedev_notify_readers()
311 		if (client->ready) {  in mousedev_notify_readers()
312 			kill_fasync(&client->fasync, SIGIO, POLL_IN);  in mousedev_notify_readers()
409 	struct mousedev_client *client = file->private_data;  in mousedev_fasync()  local
411 	return fasync_helper(fd, file, on, &client->fasync);  in mousedev_fasync()
507 				   struct mousedev_client *client)  in mousedev_attach_client()  argument
510 	list_add_tail_rcu(&client->node, &mousedev->client_list);  in mousedev_attach_client()
515 				   struct mousedev_client *client)  in mousedev_detach_client()  argument
518 	list_del_rcu(&client->node);  in mousedev_detach_client()
525 	struct mousedev_client *client = file->private_data;  in mousedev_release()  local
526 	struct mousedev *mousedev = client->mousedev;  in mousedev_release()
528 	mousedev_detach_client(mousedev, client);  in mousedev_release()
529 	kfree(client);  in mousedev_release()
538 	struct mousedev_client *client;  in mousedev_open()  local
549 	client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);  in mousedev_open()
550 	if (!client)  in mousedev_open()
553 	spin_lock_init(&client->packet_lock);  in mousedev_open()
554 	client->pos_x = xres / 2;  in mousedev_open()
555 	client->pos_y = yres / 2;  in mousedev_open()
556 	client->mousedev = mousedev;  in mousedev_open()
557 	mousedev_attach_client(mousedev, client);  in mousedev_open()
563 	file->private_data = client;  in mousedev_open()
569 	mousedev_detach_client(mousedev, client);  in mousedev_open()
570 	kfree(client);  in mousedev_open()
579 static void mousedev_packet(struct mousedev_client *client,  in mousedev_packet()  argument
582 	struct mousedev_motion *p = &client->packets[client->tail];  in mousedev_packet()
591 	switch (client->mode) {  in mousedev_packet()
596 		client->bufsiz = 4;  in mousedev_packet()
604 		client->bufsiz = 4;  in mousedev_packet()
612 		client->bufsiz = 3;  in mousedev_packet()
617 		if (client->tail == client->head) {  in mousedev_packet()
618 			client->ready = 0;  in mousedev_packet()
619 			client->last_buttons = p->buttons;  in mousedev_packet()
621 			client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;  in mousedev_packet()
625 static void mousedev_generate_response(struct mousedev_client *client,  in mousedev_generate_response()  argument
628 	client->ps2[0] = 0xfa; /* ACK */  in mousedev_generate_response()
633 		mousedev_packet(client, &client->ps2[1]);  in mousedev_generate_response()
634 		client->bufsiz++; /* account for leading ACK */  in mousedev_generate_response()
638 		switch (client->mode) {  in mousedev_generate_response()
640 			client->ps2[1] = 0;  in mousedev_generate_response()
643 			client->ps2[1] = 3;  in mousedev_generate_response()
646 			client->ps2[1] = 4;  in mousedev_generate_response()
649 		client->bufsiz = 2;  in mousedev_generate_response()
653 		client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;  in mousedev_generate_response()
654 		client->bufsiz = 4;  in mousedev_generate_response()
658 		client->impsseq = client->imexseq = 0;  in mousedev_generate_response()
659 		client->mode = MOUSEDEV_EMUL_PS2;  in mousedev_generate_response()
660 		client->ps2[1] = 0xaa; client->ps2[2] = 0x00;  in mousedev_generate_response()
661 		client->bufsiz = 3;  in mousedev_generate_response()
665 		client->bufsiz = 1;  in mousedev_generate_response()
668 	client->buffer = client->bufsiz;  in mousedev_generate_response()
674 	struct mousedev_client *client = file->private_data;  in mousedev_write()  local
683 		spin_lock_irq(&client->packet_lock);  in mousedev_write()
685 		if (c == mousedev_imex_seq[client->imexseq]) {  in mousedev_write()
686 			if (++client->imexseq == MOUSEDEV_SEQ_LEN) {  in mousedev_write()
687 				client->imexseq = 0;  in mousedev_write()
688 				client->mode = MOUSEDEV_EMUL_EXPS;  in mousedev_write()
691 			client->imexseq = 0;  in mousedev_write()
693 		if (c == mousedev_imps_seq[client->impsseq]) {  in mousedev_write()
694 			if (++client->impsseq == MOUSEDEV_SEQ_LEN) {  in mousedev_write()
695 				client->impsseq = 0;  in mousedev_write()
696 				client->mode = MOUSEDEV_EMUL_IMPS;  in mousedev_write()
699 			client->impsseq = 0;  in mousedev_write()
701 		mousedev_generate_response(client, c);  in mousedev_write()
703 		spin_unlock_irq(&client->packet_lock);  in mousedev_write()
706 	kill_fasync(&client->fasync, SIGIO, POLL_IN);  in mousedev_write()
707 	wake_up_interruptible(&client->mousedev->wait);  in mousedev_write()
715 	struct mousedev_client *client = file->private_data;  in mousedev_read()  local
716 	struct mousedev *mousedev = client->mousedev;  in mousedev_read()
717 	signed char data[sizeof(client->ps2)];  in mousedev_read()
720 	if (!client->ready && !client->buffer && mousedev->exist &&  in mousedev_read()
725 			!mousedev->exist || client->ready || client->buffer);  in mousedev_read()
732 	spin_lock_irq(&client->packet_lock);  in mousedev_read()
734 	if (!client->buffer && client->ready) {  in mousedev_read()
735 		mousedev_packet(client, client->ps2);  in mousedev_read()
736 		client->buffer = client->bufsiz;  in mousedev_read()
739 	if (count > client->buffer)  in mousedev_read()
740 		count = client->buffer;  in mousedev_read()
742 	memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);  in mousedev_read()
743 	client->buffer -= count;  in mousedev_read()
745 	spin_unlock_irq(&client->packet_lock);  in mousedev_read()
756 	struct mousedev_client *client = file->private_data;  in mousedev_poll()  local
757 	struct mousedev *mousedev = client->mousedev;  in mousedev_poll()
763 	if (client->ready || client->buffer)  in mousedev_poll()
798 	struct mousedev_client *client;  in mousedev_hangup()  local
801 	list_for_each_entry(client, &mousedev->client_list, node)  in mousedev_hangup()
802 		kill_fasync(&client->fasync, SIGIO, POLL_HUP);  in mousedev_hangup()