On Tue, 29 Oct 2013, David Cohen wrote:
> Due to USB controllers may have different restrictions, usb gadget layer
> needs to provide a generic way to inform gadget functions to complain
> with non-standard requirements.
>
> This patch adds 'quirks' field to struct usb_gadget and the first quirk
> called USB_GADGET_QUIRK_EP_OUT_ALIGNED_SIZE necessary to inform when
> controller's epout requires buffer size to be aligned to MaxPacketSize.
>
> Signed-off-by: David Cohen <david.a.cohen@xxxxxxxxxxxxxxx>
> ---
> include/linux/usb/gadget.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index 942ef5e..7014ad9 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -540,6 +540,11 @@ struct usb_gadget {
> struct device dev;
> unsigned out_epnum;
> unsigned in_epnum;
> +
> + u32 quirks;
> +/* epout requires buffer size to be aligned to MaxPacketSize */
> +#define USB_GADGET_QUIRK_EP_OUT_ALIGNED_SIZE (1 << 0)
If you decide to go through with this, it might be better to define a
series of single-bit flags instead of a single "quirks" field. For
example:
unsigned quirk_ep_out_aligned_size:1;
Yes, other people (including me!) have done it your way in the past,
but now this seems to make more sense.
Alan Stern
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