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
> +
> + 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
> + value = min_t(int, w_length, otg_desc_len);
> + memcpy(req->buf, config->descriptors[0], value);
> + }
> + break;
> }
> break;
>
cheers,
-roger
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