Alan Stern c01b244ad8
USB: add usbfs ioctl to retrieve the connection speed ...
The usbfs interface does not provide any way for the user to learn the
speed at which a device is connected. The current API includes a
USBDEVFS_CONNECTINFO ioctl, but all it provides is the device's
address and a one-bit value indicating whether the connection is low
speed. That may have sufficed in the era of USB-1.1, but it isn't
good enough today.
This patch introduces a new ioctl, USBDEVFS_GET_SPEED, which returns a
numeric value indicating the speed of the connection: unknown, low,
full, high, wireless, super, or super-plus.
Similar information (not exactly the same) is available through sysfs,
but it seems reasonable to provide the actual value in usbfs.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu >
Reported-by: Reinhard Huck <reinhard.huck@thesycon.de >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
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c01b244ad8