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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
commit e538dfdae8
18 changed files with 125 additions and 195 deletions
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12
include/linux/usb/ch9.h
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@ -868,6 +868,18 @@ enum usb_device_speed {
USB_SPEED_SUPER, /* usb 3.0 */
};
#ifdef __KERNEL__
/**
* usb_speed_string() - Returns human readable-name of the speed.
* @speed: The speed to return human-readable name for. If it's not
* any of the speeds defined in usb_device_speed enum, string for
* USB_SPEED_UNKNOWN will be returned.
*/
extern const char *usb_speed_string(enum usb_device_speed speed);
#endif
enum usb_device_state {
/* NOTATTACHED isn't in the USB spec, and this state acts
* the same as ATTACHED ... but it's clearer this way.