57 	struct userio_device *userio = id->port_data;  in userio_device_write()  local
60 	spin_lock_irqsave(&userio->buf_lock, flags);  in userio_device_write()
62 	userio->buf[userio->head] = val;  in userio_device_write()
63 	userio->head = (userio->head + 1) % USERIO_BUFSIZE;  in userio_device_write()
65 	if (userio->head == userio->tail)  in userio_device_write()
69 	spin_unlock_irqrestore(&userio->buf_lock, flags);  in userio_device_write()
71 	wake_up_interruptible(&userio->waitq);  in userio_device_write()
78 	struct userio_device *userio;  in userio_char_open()  local
80 	userio = kzalloc(sizeof(struct userio_device), GFP_KERNEL);  in userio_char_open()
81 	if (!userio)  in userio_char_open()
84 	mutex_init(&userio->mutex);  in userio_char_open()
85 	spin_lock_init(&userio->buf_lock);  in userio_char_open()
86 	init_waitqueue_head(&userio->waitq);  in userio_char_open()
88 	userio->serio = kzalloc(sizeof(struct serio), GFP_KERNEL);  in userio_char_open()
89 	if (!userio->serio) {  in userio_char_open()
90 		kfree(userio);  in userio_char_open()
94 	userio->serio->write = userio_device_write;  in userio_char_open()
95 	userio->serio->port_data = userio;  in userio_char_open()
97 	file->private_data = userio;  in userio_char_open()
104 	struct userio_device *userio = file->private_data;  in userio_char_release()  local
106 	if (userio->running) {  in userio_char_release()
111 		serio_unregister_port(userio->serio);  in userio_char_release()
113 		kfree(userio->serio);  in userio_char_release()
116 	kfree(userio);  in userio_char_release()
124 	struct userio_device *userio = file->private_data;  in userio_char_read()  local
138 		spin_lock_irqsave(&userio->buf_lock, flags);  in userio_char_read()
140 		nonwrap_len = CIRC_CNT_TO_END(userio->head,  in userio_char_read()
141 					      userio->tail,  in userio_char_read()
145 			memcpy(buf, &userio->buf[userio->tail], copylen);  in userio_char_read()
146 			userio->tail = (userio->tail + copylen) %  in userio_char_read()
150 		spin_unlock_irqrestore(&userio->buf_lock, flags);  in userio_char_read()
166 		error = wait_event_interruptible(userio->waitq,  in userio_char_read()
167 						 userio->head != userio->tail);  in userio_char_read()
182 	struct userio_device *userio = file->private_data;  in userio_char_write()  local
194 	error = mutex_lock_interruptible(&userio->mutex);  in userio_char_write()
200 		if (!userio->serio->id.type) {  in userio_char_write()
208 		if (userio->running) {  in userio_char_write()
215 		userio->running = true;  in userio_char_write()
216 		serio_register_port(userio->serio);  in userio_char_write()
220 		if (userio->running) {  in userio_char_write()
227 		userio->serio->id.type = cmd.data;  in userio_char_write()
231 		if (!userio->running) {  in userio_char_write()
238 		serio_interrupt(userio->serio, cmd.data, 0);  in userio_char_write()
247 	mutex_unlock(&userio->mutex);  in userio_char_write()
253 	struct userio_device *userio = file->private_data;  in userio_char_poll()  local
255 	poll_wait(file, &userio->waitq, wait);  in userio_char_poll()
257 	if (userio->head != userio->tail)  in userio_char_poll()