6  * This program is free software; you can redistribute it and/or modify it
8  * the Free Software Foundation; either version 2 of the License, or (at
39 	bool running;  member
51  * userio_device_write - Write data from serio to a userio device in userspace
57 	struct userio_device *userio = id->port_data;  in userio_device_write()
59 	scoped_guard(spinlock_irqsave, &userio->buf_lock) {  in userio_device_write()
60 		userio->buf[userio->head] = val;  in userio_device_write()
61 		userio->head = (userio->head + 1) % USERIO_BUFSIZE;  in userio_device_write()
63 		if (userio->head == userio->tail)  in userio_device_write()
68 	wake_up_interruptible(&userio->waitq);  in userio_device_write()
78 		return -ENOMEM;  in userio_char_open()
80 	mutex_init(&userio->mutex);  in userio_char_open()
81 	spin_lock_init(&userio->buf_lock);  in userio_char_open()
82 	init_waitqueue_head(&userio->waitq);  in userio_char_open()
84 	userio->serio = kzalloc(sizeof(*userio->serio), GFP_KERNEL);  in userio_char_open()
85 	if (!userio->serio)  in userio_char_open()
86 		return -ENOMEM;  in userio_char_open()
88 	userio->serio->write = userio_device_write;  in userio_char_open()
89 	userio->serio->port_data = userio;  in userio_char_open()
91 	file->private_data = no_free_ptr(userio);  in userio_char_open()
98 	struct userio_device *userio = file->private_data;  in userio_char_release()
100 	if (userio->running) {  in userio_char_release()
102 		 * Don't free the serio port here, serio_unregister_port()  in userio_char_release()
105 		serio_unregister_port(userio->serio);  in userio_char_release()
107 		kfree(userio->serio);  in userio_char_release()
120 	guard(spinlock_irqsave)(&userio->buf_lock);  in userio_fetch_data()
122 	available = CIRC_CNT_TO_END(userio->head, userio->tail,  in userio_fetch_data()
126 		memcpy(buf, &userio->buf[userio->tail], len);  in userio_fetch_data()
127 		userio->tail = (userio->tail + len) % USERIO_BUFSIZE;  in userio_fetch_data()
137 	struct userio_device *userio = file->private_data;  in userio_char_read()
146 	 * until we have data (unless the file descriptor is non-blocking  in userio_char_read()
155 		if (file->f_flags & O_NONBLOCK)  in userio_char_read()
156 			return -EAGAIN;  in userio_char_read()
159 		 * count == 0 is special - no IO is done but we check  in userio_char_read()
165 		error = wait_event_interruptible(userio->waitq,  in userio_char_read()
166 						 userio->head != userio->tail);  in userio_char_read()
173 			return -EFAULT;  in userio_char_read()
181 	switch (cmd->type) {  in userio_execute_cmd()
183 		if (!userio->serio->id.type) {  in userio_execute_cmd()
186 			return -EINVAL;  in userio_execute_cmd()
189 		if (userio->running) {  in userio_execute_cmd()
191 				 "Begin command sent, but we're already running\n");  in userio_execute_cmd()
192 			return -EBUSY;  in userio_execute_cmd()
195 		userio->running = true;  in userio_execute_cmd()
196 		serio_register_port(userio->serio);  in userio_execute_cmd()
200 		if (userio->running) {  in userio_execute_cmd()
202 				 "Can't change port type on an already running userio instance\n");  in userio_execute_cmd()
203 			return -EBUSY;  in userio_execute_cmd()
206 		userio->serio->id.type = cmd->data;  in userio_execute_cmd()
210 		if (!userio->running) {  in userio_execute_cmd()
213 			return -ENODEV;  in userio_execute_cmd()
216 		serio_interrupt(userio->serio, cmd->data, 0);  in userio_execute_cmd()
220 		return -EOPNOTSUPP;  in userio_execute_cmd()
229 	struct userio_device *userio = file->private_data;  in userio_char_write()
235 		return -EINVAL;  in userio_char_write()
239 		return -EFAULT;  in userio_char_write()
241 	scoped_cond_guard(mutex_intr, return -EINTR, &userio->mutex) {  in userio_char_write()
252 	struct userio_device *userio = file->private_data;  in userio_char_poll()
254 	poll_wait(file, &userio->waitq, wait);  in userio_char_poll()
256 	if (userio->head != userio->tail)  in userio_char_poll()