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> | |
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 | ||
c97611c1 | 41 | static int usb_serial_device_probe(struct device *dev) |
1da177e4 | 42 | { |
ea65370d | 43 | struct usb_serial_driver *driver; |
1da177e4 | 44 | struct usb_serial_port *port; |
ca4383a3 | 45 | struct device *tty_dev; |
1da177e4 LT |
46 | int retval = 0; |
47 | int minor; | |
48 | ||
49 | port = to_usb_serial_port(dev); | |
d6f7f412 JH |
50 | if (!port) |
51 | return -ENODEV; | |
1da177e4 | 52 | |
d5fd650c BM |
53 | /* make sure suspend/resume doesn't race against port_probe */ |
54 | retval = usb_autopm_get_interface(port->serial->interface); | |
55 | if (retval) | |
d6f7f412 | 56 | return retval; |
d5fd650c | 57 | |
1da177e4 LT |
58 | driver = port->serial->type; |
59 | if (driver->port_probe) { | |
c97611c1 | 60 | retval = driver->port_probe(port); |
1da177e4 | 61 | if (retval) |
d6f7f412 | 62 | goto err_autopm_put; |
1da177e4 LT |
63 | } |
64 | ||
1143832e | 65 | minor = port->minor; |
ca4383a3 JH |
66 | tty_dev = tty_register_device(usb_serial_tty_driver, minor, dev); |
67 | if (IS_ERR(tty_dev)) { | |
68 | retval = PTR_ERR(tty_dev); | |
d6f7f412 | 69 | goto err_port_remove; |
ca4383a3 JH |
70 | } |
71 | ||
d6f7f412 JH |
72 | usb_autopm_put_interface(port->serial->interface); |
73 | ||
c97611c1 | 74 | dev_info(&port->serial->dev->dev, |
1da177e4 | 75 | "%s converter now attached to ttyUSB%d\n", |
269bda1c | 76 | driver->description, minor); |
1da177e4 | 77 | |
d6f7f412 JH |
78 | return 0; |
79 | ||
80 | err_port_remove: | |
81 | if (driver->port_remove) | |
82 | driver->port_remove(port); | |
83 | err_autopm_put: | |
d5fd650c | 84 | usb_autopm_put_interface(port->serial->interface); |
d6f7f412 | 85 | |
1da177e4 LT |
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; | |
c14829fa | 95 | int autopm_err; |
1da177e4 LT |
96 | |
97 | port = to_usb_serial_port(dev); | |
c97611c1 | 98 | if (!port) |
1da177e4 | 99 | return -ENODEV; |
1da177e4 | 100 | |
c14829fa JH |
101 | /* |
102 | * Make sure suspend/resume doesn't race against port_remove. | |
103 | * | |
104 | * Note that no further runtime PM callbacks will be made if | |
105 | * autopm_get fails. | |
106 | */ | |
107 | autopm_err = usb_autopm_get_interface(port->serial->interface); | |
d5fd650c | 108 | |
1143832e | 109 | minor = port->minor; |
5cb27dde JH |
110 | tty_unregister_device(usb_serial_tty_driver, minor); |
111 | ||
1da177e4 | 112 | driver = port->serial->type; |
c706ebdf | 113 | if (driver->port_remove) |
c97611c1 | 114 | retval = driver->port_remove(port); |
c706ebdf | 115 | |
1da177e4 | 116 | dev_info(dev, "%s converter now disconnected from ttyUSB%d\n", |
269bda1c | 117 | driver->description, minor); |
1da177e4 | 118 | |
c14829fa JH |
119 | if (!autopm_err) |
120 | usb_autopm_put_interface(port->serial->interface); | |
121 | ||
1da177e4 LT |
122 | return retval; |
123 | } | |
124 | ||
d13a280f | 125 | static ssize_t new_id_store(struct device_driver *driver, |
93bacefc GKH |
126 | const char *buf, size_t count) |
127 | { | |
128 | struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver); | |
2fc82c2d WS |
129 | ssize_t retval = usb_store_new_id(&usb_drv->dynids, usb_drv->id_table, |
130 | driver, buf, count); | |
93bacefc GKH |
131 | |
132 | if (retval >= 0 && usb_drv->usb_driver != NULL) | |
133 | retval = usb_store_new_id(&usb_drv->usb_driver->dynids, | |
2fc82c2d | 134 | usb_drv->usb_driver->id_table, |
93bacefc GKH |
135 | &usb_drv->usb_driver->drvwrap.driver, |
136 | buf, count); | |
137 | return retval; | |
138 | } | |
139 | ||
d13a280f | 140 | static ssize_t new_id_show(struct device_driver *driver, char *buf) |
ef206f3f BM |
141 | { |
142 | struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver); | |
143 | ||
144 | return usb_show_dynids(&usb_drv->dynids, buf); | |
145 | } | |
d13a280f | 146 | static DRIVER_ATTR_RW(new_id); |
ef206f3f | 147 | |
d13a280f GKH |
148 | static struct attribute *usb_serial_drv_attrs[] = { |
149 | &driver_attr_new_id.attr, | |
150 | NULL, | |
93bacefc | 151 | }; |
d13a280f | 152 | ATTRIBUTE_GROUPS(usb_serial_drv); |
93bacefc GKH |
153 | |
154 | static void free_dynids(struct usb_serial_driver *drv) | |
155 | { | |
156 | struct usb_dynid *dynid, *n; | |
157 | ||
158 | spin_lock(&drv->dynids.lock); | |
159 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
160 | list_del(&dynid->node); | |
161 | kfree(dynid); | |
162 | } | |
163 | spin_unlock(&drv->dynids.lock); | |
164 | } | |
165 | ||
ac33bc3d RK |
166 | struct bus_type usb_serial_bus_type = { |
167 | .name = "usb-serial", | |
168 | .match = usb_serial_device_match, | |
169 | .probe = usb_serial_device_probe, | |
170 | .remove = usb_serial_device_remove, | |
d13a280f | 171 | .drv_groups = usb_serial_drv_groups, |
ac33bc3d RK |
172 | }; |
173 | ||
ea65370d | 174 | int usb_serial_bus_register(struct usb_serial_driver *driver) |
1da177e4 LT |
175 | { |
176 | int retval; | |
177 | ||
ea65370d | 178 | driver->driver.bus = &usb_serial_bus_type; |
93bacefc GKH |
179 | spin_lock_init(&driver->dynids.lock); |
180 | INIT_LIST_HEAD(&driver->dynids.list); | |
181 | ||
ea65370d | 182 | retval = driver_register(&driver->driver); |
1da177e4 LT |
183 | |
184 | return retval; | |
185 | } | |
186 | ||
ea65370d | 187 | void usb_serial_bus_deregister(struct usb_serial_driver *driver) |
1da177e4 | 188 | { |
93bacefc | 189 | free_dynids(driver); |
ea65370d | 190 | driver_unregister(&driver->driver); |
1da177e4 LT |
191 | } |
192 |