2 * USB Serial Converter Bus specific functions
4 * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/tty.h>
14 #include <linux/module.h>
15 #include <linux/usb.h>
16 #include <linux/usb/serial.h>
18 static int usb_serial_device_match (struct device
*dev
, struct device_driver
*drv
)
20 struct usb_serial_driver
*driver
;
21 const struct usb_serial_port
*port
;
24 * drivers are already assigned to ports in serial_probe so it's
25 * a simple check here.
27 port
= to_usb_serial_port(dev
);
31 driver
= to_usb_serial_driver(drv
);
33 if (driver
== port
->serial
->type
)
39 static int usb_serial_device_probe (struct device
*dev
)
41 struct usb_serial_driver
*driver
;
42 struct usb_serial_port
*port
;
46 port
= to_usb_serial_port(dev
);
52 driver
= port
->serial
->type
;
53 if (driver
->port_probe
) {
54 if (!try_module_get(driver
->driver
.owner
)) {
55 dev_err(dev
, "module get failed, exiting\n");
59 retval
= driver
->port_probe (port
);
60 module_put(driver
->driver
.owner
);
66 tty_register_device (usb_serial_tty_driver
, minor
, dev
);
67 dev_info(&port
->serial
->dev
->dev
,
68 "%s converter now attached to ttyUSB%d\n",
69 driver
->description
, minor
);
75 static int usb_serial_device_remove (struct device
*dev
)
77 struct usb_serial_driver
*driver
;
78 struct usb_serial_port
*port
;
82 port
= to_usb_serial_port(dev
);
87 driver
= port
->serial
->type
;
88 if (driver
->port_remove
) {
89 if (!try_module_get(driver
->driver
.owner
)) {
90 dev_err(dev
, "module get failed, exiting\n");
94 retval
= driver
->port_remove (port
);
95 module_put(driver
->driver
.owner
);
99 tty_unregister_device (usb_serial_tty_driver
, minor
);
100 dev_info(dev
, "%s converter now disconnected from ttyUSB%d\n",
101 driver
->description
, minor
);
106 struct bus_type usb_serial_bus_type
= {
107 .name
= "usb-serial",
108 .match
= usb_serial_device_match
,
109 .probe
= usb_serial_device_probe
,
110 .remove
= usb_serial_device_remove
,
113 int usb_serial_bus_register(struct usb_serial_driver
*driver
)
117 driver
->driver
.bus
= &usb_serial_bus_type
;
118 retval
= driver_register(&driver
->driver
);
123 void usb_serial_bus_deregister(struct usb_serial_driver
*driver
)
125 driver_unregister(&driver
->driver
);