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usb: common: introduce usb_state_string()

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this function will receive enum usb_device_state
and return a human-readable string from it or,
case an unknown value is passed as argument,
the string "UNKNOWN".

Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Felipe Balbi 2013-01-24 22:29:48 +02:00
commit d1e3d757f7
2 changed files with 30 additions and 0 deletions
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21
drivers/usb/usb-common.c
View file

@ -32,4 +32,25 @@ const char *usb_speed_string(enum usb_device_speed speed)
} }
EXPORT_SYMBOL_GPL(usb_speed_string); EXPORT_SYMBOL_GPL(usb_speed_string);
const char *usb_state_string(enum usb_device_state state)
{
static const char *const names[] = {
[USB_STATE_NOTATTACHED] = "not attached",
[USB_STATE_ATTACHED] = "attached",
[USB_STATE_POWERED] = "powered",
[USB_STATE_RECONNECTING] = "reconnecting",
[USB_STATE_UNAUTHENTICATED] = "unauthenticated",
[USB_STATE_DEFAULT] = "default",
[USB_STATE_ADDRESS] = "addresssed",
[USB_STATE_CONFIGURED] = "configured",
[USB_STATE_SUSPENDED] = "suspended",
};
if (state < 0 || state >= ARRAY_SIZE(names))
return "UNKNOWN";
return names[state];
}
EXPORT_SYMBOL_GPL(usb_state_string);
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");

9
include/linux/usb/ch9.h
View file

@ -43,4 +43,13 @@
*/ */
extern const char *usb_speed_string(enum usb_device_speed speed); extern const char *usb_speed_string(enum usb_device_speed speed);
/**
* usb_state_string - Returns human readable name for the state.
* @state: The state to return a human-readable name for. If it's not
* any of the states devices in usb_device_state_string enum,
* the string UNKNOWN will be returned.
*/
extern const char *usb_state_string(enum usb_device_state state);
#endif /* __LINUX_USB_CH9_H */ #endif /* __LINUX_USB_CH9_H */