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usb: Provide usb_speed_string() function

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In a few places in the kernel, the code prints
a human-readable USB device speed (eg. "high speed").
This involves a switch statement sometimes wrapped
around in ({ ... }) block leading to code repetition.

To mitigate this issue, this commit introduces
usb_speed_string() function, which returns
a human-readable name of provided speed.

It also changes a few places switch was used to use
this new function.  This changes a bit the way the
speed is printed in few instances at the same time
standardising it.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michal Nazarewicz
2011-08-30 17:11:19 +02:00
committed by Greg Kroah-Hartman
parent c58a76cdd7
commit e538dfdae8
18 changed files with 125 additions and 195 deletions
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35
drivers/usb/usb-common.c Normal file
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@@ -0,0 +1,35 @@
/*
* 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");