On Tue, Jun 09, 2015 at 03:27:29PM +0300, Roger Quadros wrote:
> Hi,
>
> On Mon, 8 Jun 2015 23:01:59 +0800
> Li Jun <jun.li@xxxxxxxxxxxxx> wrote:
>
> > From: Macpaul Lin <macpaul@xxxxxxxxx>
> >
> > Copy usb_otg_descriptor from config's descriptor if host requests
> > USB_DT_OTG.
> >
> > Signed-off-by: Macpaul Lin <macpaul@xxxxxxxxx>
> > Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx>
> > ---
> > drivers/usb/gadget/composite.c | 21 +++++++++++++++++++++
> > 1 file changed, 21 insertions(+)
> >
> > diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
> > index 4e3447b..6b5a0c6 100644
> > --- a/drivers/usb/gadget/composite.c
> > +++ b/drivers/usb/gadget/composite.c
> > @@ -1534,6 +1534,27 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
> > value = min(w_length, (u16) value);
> > }
> > break;
> > + case USB_DT_OTG:
> > + if (gadget_is_otg(gadget)) {
> > + struct usb_configuration *config;
> > + int otg_desc_len =
> > + sizeof(struct usb_otg_descriptor);
>
> This evaluates to 5 which is wrong for otg v1.0
>
It's still 3 for OTG 1.x
> > +
> > + if (cdev->config)
> > + config = cdev->config;
> > + else
> > + config = list_first_entry(
> > + &cdev->configs,
> > + struct usb_configuration, list);
> > + if (!config)
> > + goto done;
> > +
> > + if (gadget->otg_rev >= 0x0200)
> > + otg_desc_len += sizeof(struct bcdOTG);
>
> This will become 5 + 2 which is wrong for otg v2.0
>
It will be 3+2 for OTG 2.0
> > + value = min_t(int, w_length, otg_desc_len);
> > + memcpy(req->buf, config->descriptors[0], value);
> > + }
> > + break;
> > }
> > break;
> >
>
> cheers,
> -roger
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