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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 | ||
1da177e4 LT |
39 | static int usb_serial_device_probe (struct device *dev) |
40 | { | |
ea65370d | 41 | struct usb_serial_driver *driver; |
1da177e4 LT |
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) { | |
18fcac35 | 54 | if (!try_module_get(driver->driver.owner)) { |
1da177e4 LT |
55 | dev_err(dev, "module get failed, exiting\n"); |
56 | retval = -EIO; | |
57 | goto exit; | |
58 | } | |
59 | retval = driver->port_probe (port); | |
18fcac35 | 60 | module_put(driver->driver.owner); |
1da177e4 LT |
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", | |
269bda1c | 69 | driver->description, minor); |
1da177e4 LT |
70 | |
71 | exit: | |
72 | return retval; | |
73 | } | |
74 | ||
75 | static int usb_serial_device_remove (struct device *dev) | |
76 | { | |
ea65370d | 77 | struct usb_serial_driver *driver; |
1da177e4 LT |
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) { | |
18fcac35 | 89 | if (!try_module_get(driver->driver.owner)) { |
1da177e4 LT |
90 | dev_err(dev, "module get failed, exiting\n"); |
91 | retval = -EIO; | |
92 | goto exit; | |
93 | } | |
94 | retval = driver->port_remove (port); | |
18fcac35 | 95 | module_put(driver->driver.owner); |
1da177e4 LT |
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", | |
269bda1c | 101 | driver->description, minor); |
1da177e4 LT |
102 | |
103 | return retval; | |
104 | } | |
105 | ||
93bacefc GKH |
106 | #ifdef CONFIG_HOTPLUG |
107 | static ssize_t store_new_id(struct device_driver *driver, | |
108 | const char *buf, size_t count) | |
109 | { | |
110 | struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver); | |
111 | ssize_t retval = usb_store_new_id(&usb_drv->dynids, driver, buf, count); | |
112 | ||
113 | if (retval >= 0 && usb_drv->usb_driver != NULL) | |
114 | retval = usb_store_new_id(&usb_drv->usb_driver->dynids, | |
115 | &usb_drv->usb_driver->drvwrap.driver, | |
116 | buf, count); | |
117 | return retval; | |
118 | } | |
119 | ||
120 | static struct driver_attribute drv_attrs[] = { | |
121 | __ATTR(new_id, S_IWUSR, NULL, store_new_id), | |
122 | __ATTR_NULL, | |
123 | }; | |
124 | ||
125 | static void free_dynids(struct usb_serial_driver *drv) | |
126 | { | |
127 | struct usb_dynid *dynid, *n; | |
128 | ||
129 | spin_lock(&drv->dynids.lock); | |
130 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
131 | list_del(&dynid->node); | |
132 | kfree(dynid); | |
133 | } | |
134 | spin_unlock(&drv->dynids.lock); | |
135 | } | |
136 | ||
137 | #else | |
138 | static struct driver_attribute drv_attrs[] = { | |
139 | __ATTR_NULL, | |
140 | }; | |
03fc370b | 141 | static inline void free_dynids(struct usb_serial_driver *drv) |
93bacefc GKH |
142 | { |
143 | } | |
144 | #endif | |
145 | ||
ac33bc3d RK |
146 | struct bus_type usb_serial_bus_type = { |
147 | .name = "usb-serial", | |
148 | .match = usb_serial_device_match, | |
149 | .probe = usb_serial_device_probe, | |
150 | .remove = usb_serial_device_remove, | |
93bacefc | 151 | .drv_attrs = drv_attrs, |
ac33bc3d RK |
152 | }; |
153 | ||
ea65370d | 154 | int usb_serial_bus_register(struct usb_serial_driver *driver) |
1da177e4 LT |
155 | { |
156 | int retval; | |
157 | ||
ea65370d | 158 | driver->driver.bus = &usb_serial_bus_type; |
93bacefc GKH |
159 | spin_lock_init(&driver->dynids.lock); |
160 | INIT_LIST_HEAD(&driver->dynids.list); | |
161 | ||
ea65370d | 162 | retval = driver_register(&driver->driver); |
1da177e4 LT |
163 | |
164 | return retval; | |
165 | } | |
166 | ||
ea65370d | 167 | void usb_serial_bus_deregister(struct usb_serial_driver *driver) |
1da177e4 | 168 | { |
93bacefc | 169 | free_dynids(driver); |
ea65370d | 170 | driver_unregister(&driver->driver); |
1da177e4 LT |
171 | } |
172 |