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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 | ||
1da177e4 LT |
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> | |
a969888c | 16 | #include <linux/usb/serial.h> |
1da177e4 | 17 | |
c97611c1 AC |
18 | static int usb_serial_device_match(struct device *dev, |
19 | struct device_driver *drv) | |
1da177e4 | 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 | ||
ce0d9325 RK |
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 | ||
c97611c1 | 50 | static int usb_serial_device_probe(struct device *dev) |
1da177e4 | 51 | { |
ea65370d | 52 | struct usb_serial_driver *driver; |
1da177e4 LT |
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 | } | |
c706ebdf AS |
62 | if (port->dev_state != PORT_REGISTERING) |
63 | goto exit; | |
1da177e4 LT |
64 | |
65 | driver = port->serial->type; | |
66 | if (driver->port_probe) { | |
c97611c1 | 67 | retval = driver->port_probe(port); |
1da177e4 LT |
68 | if (retval) |
69 | goto exit; | |
70 | } | |
71 | ||
ce0d9325 | 72 | retval = device_create_file(dev, &dev_attr_port_number); |
c706ebdf AS |
73 | if (retval) { |
74 | if (driver->port_remove) | |
75 | retval = driver->port_remove(port); | |
ce0d9325 | 76 | goto exit; |
c706ebdf | 77 | } |
ce0d9325 | 78 | |
1da177e4 | 79 | minor = port->number; |
c97611c1 AC |
80 | tty_register_device(usb_serial_tty_driver, minor, dev); |
81 | dev_info(&port->serial->dev->dev, | |
1da177e4 | 82 | "%s converter now attached to ttyUSB%d\n", |
269bda1c | 83 | driver->description, minor); |
1da177e4 LT |
84 | |
85 | exit: | |
86 | return retval; | |
87 | } | |
88 | ||
c97611c1 | 89 | static int usb_serial_device_remove(struct device *dev) |
1da177e4 | 90 | { |
ea65370d | 91 | struct usb_serial_driver *driver; |
1da177e4 LT |
92 | struct usb_serial_port *port; |
93 | int retval = 0; | |
94 | int minor; | |
95 | ||
96 | port = to_usb_serial_port(dev); | |
c97611c1 | 97 | if (!port) |
1da177e4 | 98 | return -ENODEV; |
1da177e4 | 99 | |
c706ebdf AS |
100 | if (port->dev_state != PORT_UNREGISTERING) |
101 | return retval; | |
102 | ||
ce0d9325 RK |
103 | device_remove_file(&port->dev, &dev_attr_port_number); |
104 | ||
1da177e4 | 105 | driver = port->serial->type; |
c706ebdf | 106 | if (driver->port_remove) |
c97611c1 | 107 | retval = driver->port_remove(port); |
c706ebdf | 108 | |
1da177e4 | 109 | minor = port->number; |
c97611c1 | 110 | tty_unregister_device(usb_serial_tty_driver, minor); |
1da177e4 | 111 | dev_info(dev, "%s converter now disconnected from ttyUSB%d\n", |
269bda1c | 112 | driver->description, minor); |
1da177e4 LT |
113 | |
114 | return retval; | |
115 | } | |
116 | ||
93bacefc GKH |
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 | }; | |
03fc370b | 152 | static inline void free_dynids(struct usb_serial_driver *drv) |
93bacefc GKH |
153 | { |
154 | } | |
155 | #endif | |
156 | ||
ac33bc3d RK |
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, | |
93bacefc | 162 | .drv_attrs = drv_attrs, |
ac33bc3d RK |
163 | }; |
164 | ||
ea65370d | 165 | int usb_serial_bus_register(struct usb_serial_driver *driver) |
1da177e4 LT |
166 | { |
167 | int retval; | |
168 | ||
ea65370d | 169 | driver->driver.bus = &usb_serial_bus_type; |
93bacefc GKH |
170 | spin_lock_init(&driver->dynids.lock); |
171 | INIT_LIST_HEAD(&driver->dynids.list); | |
172 | ||
ea65370d | 173 | retval = driver_register(&driver->driver); |
1da177e4 LT |
174 | |
175 | return retval; | |
176 | } | |
177 | ||
ea65370d | 178 | void usb_serial_bus_deregister(struct usb_serial_driver *driver) |
1da177e4 | 179 | { |
93bacefc | 180 | free_dynids(driver); |
ea65370d | 181 | driver_unregister(&driver->driver); |
1da177e4 LT |
182 | } |
183 |