On Mon, May 05 2014, Andrzej Pietrasiewicz wrote:
> Do I get it right that you suggest creating a struct and then
> memcpy'ing it to the destination buffer?
>
> Something on the lines of:
>
> struct usb_os_string {
> __u8 bLength;
> __u8 bDescriptorType;
> __u8 qwSignature[OS_STRING_QW_SIGN_LEN];
> __u8 bMS_VendorCode;
> __u8 bPad;
> } __attribute__ ((packed));
>
> And then have cdev have a struct usb_os_string member instead of
> qw_sign and b_vendor_code?
I leave it up to you whether cdev should change, but I think get_string
should read something like:
if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) {
struct usb_os_string *b = buf;
b->bLength = sizeof *b;
b->bDescriptorType = USB_DT_STRING;
STATIC_ASSERT(sizeof b->qwSignature == sizeof cdev->qw_sign);
memcpy(&b->qwSignature, cdev->qw_sign, sizeof b->qwSignature);
b->bMS_VendorCode = cdev->b_vendor_code;
b->bPad = 0;
return sizeof *b;
}
Should cdev have usb_os_string member, get_string would be simpler but
cdev would be a bit bigger.
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