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author | Michal Nazarewicz <mina86@mina86.com> | 2011-08-30 17:11:19 +0200 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-09-18 01:29:04 -0700 |
commit | e538dfdae85244fd2c4231725d82cc1f1bc4942c (patch) | |
tree | f8471dd9af305b95557d29a30f427c85418b1621 /drivers/usb/usb-common.c | |
parent | c58a76cdd7ab5a945a44fd2d64f6faf40323f95b (diff) | |
download | op-kernel-dev-e538dfdae85244fd2c4231725d82cc1f1bc4942c.zip op-kernel-dev-e538dfdae85244fd2c4231725d82cc1f1bc4942c.tar.gz |
usb: Provide usb_speed_string() function
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>
Diffstat (limited to 'drivers/usb/usb-common.c')
-rw-r--r-- | drivers/usb/usb-common.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/usb/usb-common.c b/drivers/usb/usb-common.c new file mode 100644 index 0000000..d29503e --- /dev/null +++ b/drivers/usb/usb-common.c @@ -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"); |