linux/drivers/usb/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
  18const 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}
  33EXPORT_SYMBOL_GPL(usb_speed_string);
  34
  35MODULE_LICENSE("GPL");
  36
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