Linux Kernel  3.7.1
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usb-common.c
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1 /*
2  * Provides code common for host and device side USB.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License as
6  * published by the Free Software Foundation, version 2.
7  *
8  * If either host side (ie. CONFIG_USB=y) or device side USB stack
9  * (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is
10  * compiled-in as well. Otherwise, if either of the two stacks is
11  * compiled as module, this file is compiled as module as well.
12  */
13 
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/usb/ch9.h>
17 
18 const char *usb_speed_string(enum usb_device_speed speed)
19 {
20  static const char *const names[] = {
21  [USB_SPEED_UNKNOWN] = "UNKNOWN",
22  [USB_SPEED_LOW] = "low-speed",
23  [USB_SPEED_FULL] = "full-speed",
24  [USB_SPEED_HIGH] = "high-speed",
25  [USB_SPEED_WIRELESS] = "wireless",
26  [USB_SPEED_SUPER] = "super-speed",
27  };
28 
29  if (speed < 0 || speed >= ARRAY_SIZE(names))
30  speed = USB_SPEED_UNKNOWN;
31  return names[speed];
32 }
34 
35 MODULE_LICENSE("GPL");