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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> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/usb.h> | |
a969888c | 17 | #include <linux/usb/serial.h> |
1da177e4 | 18 | |
c97611c1 AC |
19 | static int usb_serial_device_match(struct device *dev, |
20 | struct device_driver *drv) | |
1da177e4 | 21 | { |
ea65370d | 22 | struct usb_serial_driver *driver; |
1da177e4 LT |
23 | const struct usb_serial_port *port; |
24 | ||
25 | /* | |
26 | * drivers are already assigned to ports in serial_probe so it's | |
27 | * a simple check here. | |
28 | */ | |
29 | port = to_usb_serial_port(dev); | |
30 | if (!port) | |
31 | return 0; | |
32 | ||
33 | driver = to_usb_serial_driver(drv); | |
34 | ||
35 | if (driver == port->serial->type) | |
36 | return 1; | |
37 | ||
38 | return 0; | |
39 | } | |
40 | ||
ce0d9325 RK |
41 | static ssize_t show_port_number(struct device *dev, |
42 | struct device_attribute *attr, char *buf) | |
43 | { | |
44 | struct usb_serial_port *port = to_usb_serial_port(dev); | |
45 | ||
46 | return sprintf(buf, "%d\n", port->number - port->serial->minor); | |
47 | } | |
48 | ||
49 | static DEVICE_ATTR(port_number, S_IRUGO, show_port_number, NULL); | |
50 | ||
c97611c1 | 51 | static int usb_serial_device_probe(struct device *dev) |
1da177e4 | 52 | { |
ea65370d | 53 | struct usb_serial_driver *driver; |
1da177e4 LT |
54 | struct usb_serial_port *port; |
55 | int retval = 0; | |
56 | int minor; | |
57 | ||
58 | port = to_usb_serial_port(dev); | |
59 | if (!port) { | |
60 | retval = -ENODEV; | |
61 | goto exit; | |
62 | } | |
c706ebdf AS |
63 | if (port->dev_state != PORT_REGISTERING) |
64 | goto exit; | |
1da177e4 LT |
65 | |
66 | driver = port->serial->type; | |
67 | if (driver->port_probe) { | |
c97611c1 | 68 | retval = driver->port_probe(port); |
1da177e4 LT |
69 | if (retval) |
70 | goto exit; | |
71 | } | |
72 | ||
ce0d9325 | 73 | retval = device_create_file(dev, &dev_attr_port_number); |
c706ebdf AS |
74 | if (retval) { |
75 | if (driver->port_remove) | |
76 | retval = driver->port_remove(port); | |
ce0d9325 | 77 | goto exit; |
c706ebdf | 78 | } |
ce0d9325 | 79 | |
1da177e4 | 80 | minor = port->number; |
c97611c1 AC |
81 | tty_register_device(usb_serial_tty_driver, minor, dev); |
82 | dev_info(&port->serial->dev->dev, | |
1da177e4 | 83 | "%s converter now attached to ttyUSB%d\n", |
269bda1c | 84 | driver->description, minor); |
1da177e4 LT |
85 | |
86 | exit: | |
87 | return retval; | |
88 | } | |
89 | ||
c97611c1 | 90 | static int usb_serial_device_remove(struct device *dev) |
1da177e4 | 91 | { |
ea65370d | 92 | struct usb_serial_driver *driver; |
1da177e4 LT |
93 | struct usb_serial_port *port; |
94 | int retval = 0; | |
95 | int minor; | |
96 | ||
97 | port = to_usb_serial_port(dev); | |
c97611c1 | 98 | if (!port) |
1da177e4 | 99 | return -ENODEV; |
1da177e4 | 100 | |
c706ebdf AS |
101 | if (port->dev_state != PORT_UNREGISTERING) |
102 | return retval; | |
103 | ||
ce0d9325 RK |
104 | device_remove_file(&port->dev, &dev_attr_port_number); |
105 | ||
1da177e4 | 106 | driver = port->serial->type; |
c706ebdf | 107 | if (driver->port_remove) |
c97611c1 | 108 | retval = driver->port_remove(port); |
c706ebdf | 109 | |
1da177e4 | 110 | minor = port->number; |
c97611c1 | 111 | tty_unregister_device(usb_serial_tty_driver, minor); |
1da177e4 | 112 | dev_info(dev, "%s converter now disconnected from ttyUSB%d\n", |
269bda1c | 113 | driver->description, minor); |
1da177e4 LT |
114 | |
115 | return retval; | |
116 | } | |
117 | ||
93bacefc GKH |
118 | #ifdef CONFIG_HOTPLUG |
119 | static ssize_t store_new_id(struct device_driver *driver, | |
120 | const char *buf, size_t count) | |
121 | { | |
122 | struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver); | |
123 | ssize_t retval = usb_store_new_id(&usb_drv->dynids, driver, buf, count); | |
124 | ||
125 | if (retval >= 0 && usb_drv->usb_driver != NULL) | |
126 | retval = usb_store_new_id(&usb_drv->usb_driver->dynids, | |
127 | &usb_drv->usb_driver->drvwrap.driver, | |
128 | buf, count); | |
129 | return retval; | |
130 | } | |
131 | ||
132 | static struct driver_attribute drv_attrs[] = { | |
133 | __ATTR(new_id, S_IWUSR, NULL, store_new_id), | |
134 | __ATTR_NULL, | |
135 | }; | |
136 | ||
137 | static void free_dynids(struct usb_serial_driver *drv) | |
138 | { | |
139 | struct usb_dynid *dynid, *n; | |
140 | ||
141 | spin_lock(&drv->dynids.lock); | |
142 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
143 | list_del(&dynid->node); | |
144 | kfree(dynid); | |
145 | } | |
146 | spin_unlock(&drv->dynids.lock); | |
147 | } | |
148 | ||
149 | #else | |
150 | static struct driver_attribute drv_attrs[] = { | |
151 | __ATTR_NULL, | |
152 | }; | |
03fc370b | 153 | static inline void free_dynids(struct usb_serial_driver *drv) |
93bacefc GKH |
154 | { |
155 | } | |
156 | #endif | |
157 | ||
ac33bc3d RK |
158 | struct bus_type usb_serial_bus_type = { |
159 | .name = "usb-serial", | |
160 | .match = usb_serial_device_match, | |
161 | .probe = usb_serial_device_probe, | |
162 | .remove = usb_serial_device_remove, | |
93bacefc | 163 | .drv_attrs = drv_attrs, |
ac33bc3d RK |
164 | }; |
165 | ||
ea65370d | 166 | int usb_serial_bus_register(struct usb_serial_driver *driver) |
1da177e4 LT |
167 | { |
168 | int retval; | |
169 | ||
ea65370d | 170 | driver->driver.bus = &usb_serial_bus_type; |
93bacefc GKH |
171 | spin_lock_init(&driver->dynids.lock); |
172 | INIT_LIST_HEAD(&driver->dynids.list); | |
173 | ||
ea65370d | 174 | retval = driver_register(&driver->driver); |
1da177e4 LT |
175 | |
176 | return retval; | |
177 | } | |
178 | ||
ea65370d | 179 | void usb_serial_bus_deregister(struct usb_serial_driver *driver) |
1da177e4 | 180 | { |
93bacefc | 181 | free_dynids(driver); |
ea65370d | 182 | driver_unregister(&driver->driver); |
1da177e4 LT |
183 | } |
184 |