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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/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>
17
18 static int usb_serial_device_match (struct device *dev, struct device_driver *drv)
19 {
20         struct usb_serial_driver *driver;
21         const struct usb_serial_port *port;
22
23         /*
24          * drivers are already assigned to ports in serial_probe so it's
25          * a simple check here.
26          */
27         port = to_usb_serial_port(dev);
28         if (!port)
29                 return 0;
30
31         driver = to_usb_serial_driver(drv);
32
33         if (driver == port->serial->type)
34                 return 1;
35
36         return 0;
37 }
38
39 static int usb_serial_device_probe (struct device *dev)
40 {
41         struct usb_serial_driver *driver;
42         struct usb_serial_port *port;
43         int retval = 0;
44         int minor;
45
46         port = to_usb_serial_port(dev);
47         if (!port) {
48                 retval = -ENODEV;
49                 goto exit;
50         }
51
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");
56                         retval = -EIO;
57                         goto exit;
58                 }
59                 retval = driver->port_probe (port);
60                 module_put(driver->driver.owner);
61                 if (retval)
62                         goto exit;
63         }
64
65         minor = port->number;
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);
70
71 exit:
72         return retval;
73 }
74
75 static int usb_serial_device_remove (struct device *dev)
76 {
77         struct usb_serial_driver *driver;
78         struct usb_serial_port *port;
79         int retval = 0;
80         int minor;
81
82         port = to_usb_serial_port(dev);
83         if (!port) {
84                 return -ENODEV;
85         }
86
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");
91                         retval = -EIO;
92                         goto exit;
93                 }
94                 retval = driver->port_remove (port);
95                 module_put(driver->driver.owner);
96         }
97 exit:
98         minor = port->number;
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);
102
103         return retval;
104 }
105
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,
111 };
112
113 int usb_serial_bus_register(struct usb_serial_driver *driver)
114 {
115         int retval;
116
117         driver->driver.bus = &usb_serial_bus_type;
118         retval = driver_register(&driver->driver);
119
120         return retval;
121 }
122
123 void usb_serial_bus_deregister(struct usb_serial_driver *driver)
124 {
125         driver_unregister(&driver->driver);
126 }
127