5  * The rpmsg tty driver implements serial communication on the RPMsg bus to makes
7  * tty protocol.
9  * The remote processor can instantiate a new tty by requesting a "rpmsg-tty" RPMsg service.
10  * The "rpmsg-tty" service is directly used for data exchange. No flow control is implemented yet.
18 #include <linux/tty.h>
24 static DEFINE_IDR(tty_idr);	/* tty instance id */
30 	struct tty_port		port;	 /* TTY port data */
31 	int			id;	 /* TTY rpmsg index */
50 static int rpmsg_tty_install(struct tty_driver *driver, struct tty_struct *tty)  in rpmsg_tty_install()  argument
52 	struct rpmsg_tty_port *cport = idr_find(&tty_idr, tty->index);  in rpmsg_tty_install()
55 	tty->driver_data = cport;  in rpmsg_tty_install()
58 	return tty_port_install(port, driver, tty);  in rpmsg_tty_install()
61 static void rpmsg_tty_cleanup(struct tty_struct *tty)  in rpmsg_tty_cleanup()  argument
63 	tty_port_put(tty->port);  in rpmsg_tty_cleanup()
66 static int rpmsg_tty_open(struct tty_struct *tty, struct file *filp)  in rpmsg_tty_open()  argument
68 	return tty_port_open(tty->port, tty, filp);  in rpmsg_tty_open()
71 static void rpmsg_tty_close(struct tty_struct *tty, struct file *filp)  in rpmsg_tty_close()  argument
73 	return tty_port_close(tty->port, tty, filp);  in rpmsg_tty_close()
76 static ssize_t rpmsg_tty_write(struct tty_struct *tty, const u8 *buf,  in rpmsg_tty_write()  argument
79 	struct rpmsg_tty_port *cport = tty->driver_data;  in rpmsg_tty_write()
105 static unsigned int rpmsg_tty_write_room(struct tty_struct *tty)  in rpmsg_tty_write_room()  argument
107 	struct rpmsg_tty_port *cport = tty->driver_data;  in rpmsg_tty_write_room()
117 static void rpmsg_tty_hangup(struct tty_struct *tty)  in rpmsg_tty_hangup()  argument
119 	tty_port_hangup(tty->port);  in rpmsg_tty_hangup()
180 		return dev_err_probe(dev, PTR_ERR(cport), "Failed to alloc tty port\n");  in rpmsg_tty_probe()
188 		ret = dev_err_probe(dev, PTR_ERR(tty_dev), "Failed to register tty port\n");  in rpmsg_tty_probe()
207 	dev_dbg(&rpdev->dev, "Removing rpmsg tty device %d\n", cport->id);  in rpmsg_tty_remove()
209 	/* User hang up to release the tty */  in rpmsg_tty_remove()
218 	{ .name	= "rpmsg-tty" },
287 MODULE_DESCRIPTION("remote processor messaging tty driver");