On Wed, 24 Jun 2009, Prabhu Chawandi wrote:
> HI alan,
>
> I am reading the descriptor and speed of the USB storage device, for
> that I wrote an ioctl locally,
>
> Here is the code segment returning error ---
>
> ret = usb_control_msg(pRootHub, usb_rcvctrlpipe(pRootHub, 0),
> USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0,
> port_num + 1, portsts, sizeof(struct usb_hub_status),
> 5000/* HZ */);
> if (ret < 0) {
> err("3 HUB_PORT: --> %s (%d) failed (err = %d)",
> __FUNCTION__, pRootHub->devnum, ret);
> }
>
> I am getting the above error:
>
> Getting in depth, I am having two HCDs, How can I check which HCD is
> being used ?
Read the system log for bootup. The log messages say which HCD is used
for each controller.
> As this IOCTL is working prefect for the rear port which is using the
> controller 0, with only one port.
>
> While its giving the above error for front port, which is another
> controller 1 with one port.
What is the error code you get? Are you sure that pRootHub is set
correctly?
Have you looked at get_port_status() in drivers/usb/core/hub.c? It
does essentially the same thing as your code above, and it works
perfectly.
Alan Stern
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
