/* * Provides code common for host and device side USB. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2. * * If either host side (ie. CONFIG_USB=y) or device side USB stack * (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is * compiled-in as well.  Otherwise, if either of the two stacks is * compiled as module, this file is compiled as module as well. */ #include <linux/kernel.h>#include <linux/module.h>#include <linux/usb/ch9.h> const char *usb_speed_string(enum usb_device_speed speed){	static const char *const names[] = {		[USB_SPEED_UNKNOWN] = "UNKNOWN",		[USB_SPEED_LOW] = "low-speed",		[USB_SPEED_FULL] = "full-speed",		[USB_SPEED_HIGH] = "high-speed",		[USB_SPEED_WIRELESS] = "wireless",		[USB_SPEED_SUPER] = "super-speed",	}; 	if (speed < 0 || speed >= ARRAY_SIZE(names))		speed = USB_SPEED_UNKNOWN;	return names[speed];}EXPORT_SYMBOL_GPL(usb_speed_string); MODULE_LICENSE("GPL");