Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * USB Serial Converter Bus specific functions | |
3 | * | |
4 | * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com) | |
5 | * | |
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. | |
9 | */ | |
10 | ||
11 | #include <linux/config.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/tty.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/usb.h> | |
17 | #include "usb-serial.h" | |
18 | ||
19 | static int usb_serial_device_match (struct device *dev, struct device_driver *drv) | |
20 | { | |
ea65370d | 21 | struct usb_serial_driver *driver; |
1da177e4 LT |
22 | const struct usb_serial_port *port; |
23 | ||
24 | /* | |
25 | * drivers are already assigned to ports in serial_probe so it's | |
26 | * a simple check here. | |
27 | */ | |
28 | port = to_usb_serial_port(dev); | |
29 | if (!port) | |
30 | return 0; | |
31 | ||
32 | driver = to_usb_serial_driver(drv); | |
33 | ||
34 | if (driver == port->serial->type) | |
35 | return 1; | |
36 | ||
37 | return 0; | |
38 | } | |
39 | ||
40 | struct bus_type usb_serial_bus_type = { | |
41 | .name = "usb-serial", | |
42 | .match = usb_serial_device_match, | |
43 | }; | |
44 | ||
45 | static int usb_serial_device_probe (struct device *dev) | |
46 | { | |
ea65370d | 47 | struct usb_serial_driver *driver; |
1da177e4 LT |
48 | struct usb_serial_port *port; |
49 | int retval = 0; | |
50 | int minor; | |
51 | ||
52 | port = to_usb_serial_port(dev); | |
53 | if (!port) { | |
54 | retval = -ENODEV; | |
55 | goto exit; | |
56 | } | |
57 | ||
58 | driver = port->serial->type; | |
59 | if (driver->port_probe) { | |
60 | if (!try_module_get(driver->owner)) { | |
61 | dev_err(dev, "module get failed, exiting\n"); | |
62 | retval = -EIO; | |
63 | goto exit; | |
64 | } | |
65 | retval = driver->port_probe (port); | |
66 | module_put(driver->owner); | |
67 | if (retval) | |
68 | goto exit; | |
69 | } | |
70 | ||
71 | minor = port->number; | |
72 | tty_register_device (usb_serial_tty_driver, minor, dev); | |
73 | dev_info(&port->serial->dev->dev, | |
74 | "%s converter now attached to ttyUSB%d\n", | |
75 | driver->name, minor); | |
76 | ||
77 | exit: | |
78 | return retval; | |
79 | } | |
80 | ||
81 | static int usb_serial_device_remove (struct device *dev) | |
82 | { | |
ea65370d | 83 | struct usb_serial_driver *driver; |
1da177e4 LT |
84 | struct usb_serial_port *port; |
85 | int retval = 0; | |
86 | int minor; | |
87 | ||
88 | port = to_usb_serial_port(dev); | |
89 | if (!port) { | |
90 | return -ENODEV; | |
91 | } | |
92 | ||
93 | driver = port->serial->type; | |
94 | if (driver->port_remove) { | |
95 | if (!try_module_get(driver->owner)) { | |
96 | dev_err(dev, "module get failed, exiting\n"); | |
97 | retval = -EIO; | |
98 | goto exit; | |
99 | } | |
100 | retval = driver->port_remove (port); | |
101 | module_put(driver->owner); | |
102 | } | |
103 | exit: | |
104 | minor = port->number; | |
105 | tty_unregister_device (usb_serial_tty_driver, minor); | |
106 | dev_info(dev, "%s converter now disconnected from ttyUSB%d\n", | |
107 | driver->name, minor); | |
108 | ||
109 | return retval; | |
110 | } | |
111 | ||
ea65370d | 112 | int usb_serial_bus_register(struct usb_serial_driver *driver) |
1da177e4 LT |
113 | { |
114 | int retval; | |
115 | ||
ea65370d GKH |
116 | if (driver->short_name) |
117 | driver->driver.name = (char *)driver->short_name; | |
1da177e4 | 118 | else |
ea65370d GKH |
119 | driver->driver.name = (char *)driver->name; |
120 | driver->driver.bus = &usb_serial_bus_type; | |
121 | driver->driver.probe = usb_serial_device_probe; | |
122 | driver->driver.remove = usb_serial_device_remove; | |
123 | driver->driver.owner = driver->owner; | |
1da177e4 | 124 | |
ea65370d | 125 | retval = driver_register(&driver->driver); |
1da177e4 LT |
126 | |
127 | return retval; | |
128 | } | |
129 | ||
ea65370d | 130 | void usb_serial_bus_deregister(struct usb_serial_driver *driver) |
1da177e4 | 131 | { |
ea65370d | 132 | driver_unregister(&driver->driver); |
1da177e4 LT |
133 | } |
134 |