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