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,
19 struct device_driver *drv)
20 {
21 struct usb_serial_driver *driver;
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 static ssize_t show_port_number(struct device *dev,
41 struct device_attribute *attr, char *buf)
42 {
43 struct usb_serial_port *port = to_usb_serial_port(dev);
44
45 return sprintf(buf, "%d\n", port->number - port->serial->minor);
46 }
47
48 static DEVICE_ATTR(port_number, S_IRUGO, show_port_number, NULL);
49
50 static int usb_serial_device_probe(struct device *dev)
51 {
52 struct usb_serial_driver *driver;
53 struct usb_serial_port *port;
54 int retval = 0;
55 int minor;
56
57 port = to_usb_serial_port(dev);
58 if (!port) {
59 retval = -ENODEV;
60 goto exit;
61 }
62 if (port->dev_state != PORT_REGISTERING)
63 goto exit;
64
65 driver = port->serial->type;
66 if (driver->port_probe) {
67 retval = driver->port_probe(port);
68 if (retval)
69 goto exit;
70 }
71
72 retval = device_create_file(dev, &dev_attr_port_number);
73 if (retval) {
74 if (driver->port_remove)
75 retval = driver->port_remove(port);
76 goto exit;
77 }
78
79 minor = port->number;
80 tty_register_device(usb_serial_tty_driver, minor, dev);
81 dev_info(&port->serial->dev->dev,
82 "%s converter now attached to ttyUSB%d\n",
83 driver->description, minor);
84
85 exit:
86 return retval;
87 }
88
89 static int usb_serial_device_remove(struct device *dev)
90 {
91 struct usb_serial_driver *driver;
92 struct usb_serial_port *port;
93 int retval = 0;
94 int minor;
95
96 port = to_usb_serial_port(dev);
97 if (!port)
98 return -ENODEV;
99
100 if (port->dev_state != PORT_UNREGISTERING)
101 return retval;
102
103 device_remove_file(&port->dev, &dev_attr_port_number);
104
105 driver = port->serial->type;
106 if (driver->port_remove)
107 retval = driver->port_remove(port);
108
109 minor = port->number;
110 tty_unregister_device(usb_serial_tty_driver, minor);
111 dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
112 driver->description, minor);
113
114 return retval;
115 }
116
117 #ifdef CONFIG_HOTPLUG
118 static ssize_t store_new_id(struct device_driver *driver,
119 const char *buf, size_t count)
120 {
121 struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
122 ssize_t retval = usb_store_new_id(&usb_drv->dynids, driver, buf, count);
123
124 if (retval >= 0 && usb_drv->usb_driver != NULL)
125 retval = usb_store_new_id(&usb_drv->usb_driver->dynids,
126 &usb_drv->usb_driver->drvwrap.driver,
127 buf, count);
128 return retval;
129 }
130
131 static struct driver_attribute drv_attrs[] = {
132 __ATTR(new_id, S_IWUSR, NULL, store_new_id),
133 __ATTR_NULL,
134 };
135
136 static void free_dynids(struct usb_serial_driver *drv)
137 {
138 struct usb_dynid *dynid, *n;
139
140 spin_lock(&drv->dynids.lock);
141 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
142 list_del(&dynid->node);
143 kfree(dynid);
144 }
145 spin_unlock(&drv->dynids.lock);
146 }
147
148 #else
149 static struct driver_attribute drv_attrs[] = {
150 __ATTR_NULL,
151 };
152 static inline void free_dynids(struct usb_serial_driver *drv)
153 {
154 }
155 #endif
156
157 struct bus_type usb_serial_bus_type = {
158 .name = "usb-serial",
159 .match = usb_serial_device_match,
160 .probe = usb_serial_device_probe,
161 .remove = usb_serial_device_remove,
162 .drv_attrs = drv_attrs,
163 };
164
165 int usb_serial_bus_register(struct usb_serial_driver *driver)
166 {
167 int retval;
168
169 driver->driver.bus = &usb_serial_bus_type;
170 spin_lock_init(&driver->dynids.lock);
171 INIT_LIST_HEAD(&driver->dynids.list);
172
173 retval = driver_register(&driver->driver);
174
175 return retval;
176 }
177
178 void usb_serial_bus_deregister(struct usb_serial_driver *driver)
179 {
180 free_dynids(driver);
181 driver_unregister(&driver->driver);
182 }
183
184
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