Commit | Line | Data |
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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 LT |
17 | |
18 | static int usb_serial_device_match (struct device *dev, struct device_driver *drv) | |
19 | { | |
ea65370d | 20 | struct usb_serial_driver *driver; |
1da177e4 LT |
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 | ||
ce0d9325 RK |
39 | static ssize_t show_port_number(struct device *dev, |
40 | struct device_attribute *attr, char *buf) | |
41 | { | |
42 | struct usb_serial_port *port = to_usb_serial_port(dev); | |
43 | ||
44 | return sprintf(buf, "%d\n", port->number - port->serial->minor); | |
45 | } | |
46 | ||
47 | static DEVICE_ATTR(port_number, S_IRUGO, show_port_number, NULL); | |
48 | ||
1da177e4 LT |
49 | static int usb_serial_device_probe (struct device *dev) |
50 | { | |
ea65370d | 51 | struct usb_serial_driver *driver; |
1da177e4 LT |
52 | struct usb_serial_port *port; |
53 | int retval = 0; | |
54 | int minor; | |
55 | ||
56 | port = to_usb_serial_port(dev); | |
57 | if (!port) { | |
58 | retval = -ENODEV; | |
59 | goto exit; | |
60 | } | |
61 | ||
62 | driver = port->serial->type; | |
63 | if (driver->port_probe) { | |
18fcac35 | 64 | if (!try_module_get(driver->driver.owner)) { |
1da177e4 LT |
65 | dev_err(dev, "module get failed, exiting\n"); |
66 | retval = -EIO; | |
67 | goto exit; | |
68 | } | |
69 | retval = driver->port_probe (port); | |
18fcac35 | 70 | module_put(driver->driver.owner); |
1da177e4 LT |
71 | if (retval) |
72 | goto exit; | |
73 | } | |
74 | ||
ce0d9325 RK |
75 | retval = device_create_file(dev, &dev_attr_port_number); |
76 | if (retval) | |
77 | goto exit; | |
78 | ||
1da177e4 LT |
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", | |
269bda1c | 83 | driver->description, minor); |
1da177e4 LT |
84 | |
85 | exit: | |
86 | return retval; | |
87 | } | |
88 | ||
89 | static int usb_serial_device_remove (struct device *dev) | |
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); | |
97 | if (!port) { | |
98 | return -ENODEV; | |
99 | } | |
100 | ||
ce0d9325 RK |
101 | device_remove_file(&port->dev, &dev_attr_port_number); |
102 | ||
1da177e4 LT |
103 | driver = port->serial->type; |
104 | if (driver->port_remove) { | |
18fcac35 | 105 | if (!try_module_get(driver->driver.owner)) { |
1da177e4 LT |
106 | dev_err(dev, "module get failed, exiting\n"); |
107 | retval = -EIO; | |
108 | goto exit; | |
109 | } | |
110 | retval = driver->port_remove (port); | |
18fcac35 | 111 | module_put(driver->driver.owner); |
1da177e4 LT |
112 | } |
113 | exit: | |
114 | minor = port->number; | |
115 | tty_unregister_device (usb_serial_tty_driver, minor); | |
116 | dev_info(dev, "%s converter now disconnected from ttyUSB%d\n", | |
269bda1c | 117 | driver->description, minor); |
1da177e4 LT |
118 | |
119 | return retval; | |
120 | } | |
121 | ||
93bacefc GKH |
122 | #ifdef CONFIG_HOTPLUG |
123 | static ssize_t store_new_id(struct device_driver *driver, | |
124 | const char *buf, size_t count) | |
125 | { | |
126 | struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver); | |
127 | ssize_t retval = usb_store_new_id(&usb_drv->dynids, driver, buf, count); | |
128 | ||
129 | if (retval >= 0 && usb_drv->usb_driver != NULL) | |
130 | retval = usb_store_new_id(&usb_drv->usb_driver->dynids, | |
131 | &usb_drv->usb_driver->drvwrap.driver, | |
132 | buf, count); | |
133 | return retval; | |
134 | } | |
135 | ||
136 | static struct driver_attribute drv_attrs[] = { | |
137 | __ATTR(new_id, S_IWUSR, NULL, store_new_id), | |
138 | __ATTR_NULL, | |
139 | }; | |
140 | ||
141 | static void free_dynids(struct usb_serial_driver *drv) | |
142 | { | |
143 | struct usb_dynid *dynid, *n; | |
144 | ||
145 | spin_lock(&drv->dynids.lock); | |
146 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
147 | list_del(&dynid->node); | |
148 | kfree(dynid); | |
149 | } | |
150 | spin_unlock(&drv->dynids.lock); | |
151 | } | |
152 | ||
153 | #else | |
154 | static struct driver_attribute drv_attrs[] = { | |
155 | __ATTR_NULL, | |
156 | }; | |
03fc370b | 157 | static inline void free_dynids(struct usb_serial_driver *drv) |
93bacefc GKH |
158 | { |
159 | } | |
160 | #endif | |
161 | ||
ac33bc3d RK |
162 | struct bus_type usb_serial_bus_type = { |
163 | .name = "usb-serial", | |
164 | .match = usb_serial_device_match, | |
165 | .probe = usb_serial_device_probe, | |
166 | .remove = usb_serial_device_remove, | |
93bacefc | 167 | .drv_attrs = drv_attrs, |
ac33bc3d RK |
168 | }; |
169 | ||
ea65370d | 170 | int usb_serial_bus_register(struct usb_serial_driver *driver) |
1da177e4 LT |
171 | { |
172 | int retval; | |
173 | ||
ea65370d | 174 | driver->driver.bus = &usb_serial_bus_type; |
93bacefc GKH |
175 | spin_lock_init(&driver->dynids.lock); |
176 | INIT_LIST_HEAD(&driver->dynids.list); | |
177 | ||
ea65370d | 178 | retval = driver_register(&driver->driver); |
1da177e4 LT |
179 | |
180 | return retval; | |
181 | } | |
182 | ||
ea65370d | 183 | void usb_serial_bus_deregister(struct usb_serial_driver *driver) |
1da177e4 | 184 | { |
93bacefc | 185 | free_dynids(driver); |
ea65370d | 186 | driver_unregister(&driver->driver); |
1da177e4 LT |
187 | } |
188 |