NTSTATUS AndroidUsbPipeFileObject::InitializePipe(
const WDF_USB_PIPE_INFORMATION* pipe_info) {
ASSERT_IRQL_LOW();
ASSERT(IsPipeAttached());
if (!IsPipeAttached())
return STATUS_INTERNAL_ERROR;
// Initialize base class
NTSTATUS status = AndroidUsbFileObject::Initialize();
ASSERT(NT_SUCCESS(status));
if (!NT_SUCCESS(status))
return status;
// Save pipe information
pipe_information_ = *pipe_info;
// We will provide size check ourselves (less surprizes always better)
WdfUsbTargetPipeSetNoMaximumPacketSizeCheck(wdf_pipe());
GoogleDbgPrint("\n===== File %p for %s pipe. max_transfer_size = %X, max_packet_size = %X",
this, is_input_pipe() ? "read" : "write",
max_transfer_size(), max_packet_size());
return STATUS_SUCCESS;
}
/*
Set up PTD's.
*/
static void prepare_ptd(struct isp1362_hcd *isp1362_hcd, struct urb *urb,
struct isp1362_ep *ep, struct isp1362_ep_queue *epq,
u16 fno)
{
struct ptd *ptd;
int toggle;
int dir;
u16 len;
size_t buf_len = urb->transfer_buffer_length - urb->actual_length;
DBG(3, "%s: %s ep %p\n", __func__, epq->name, ep);
ptd = &ep->ptd;
ep->data = (unsigned char *)urb->transfer_buffer + urb->actual_length;
switch (ep->nextpid) {
case USB_PID_IN:
toggle = usb_gettoggle(urb->dev, ep->epnum, 0);
dir = PTD_DIR_IN;
if (usb_pipecontrol(urb->pipe)) {
len = min_t(size_t, ep->maxpacket, buf_len);
} else if (usb_pipeisoc(urb->pipe)) {
len = min_t(size_t, urb->iso_frame_desc[fno].length, MAX_XFER_SIZE);
ep->data = urb->transfer_buffer + urb->iso_frame_desc[fno].offset;
} else
len = max_transfer_size(epq, buf_len, ep->maxpacket);
DBG(1, "%s: IN len %d/%d/%d from URB\n", __func__, len, ep->maxpacket,
(int)buf_len);
break;
case USB_PID_OUT:
toggle = usb_gettoggle(urb->dev, ep->epnum, 1);
dir = PTD_DIR_OUT;
if (usb_pipecontrol(urb->pipe))
len = min_t(size_t, ep->maxpacket, buf_len);
else if (usb_pipeisoc(urb->pipe))
len = min_t(size_t, urb->iso_frame_desc[0].length, MAX_XFER_SIZE);
else
len = max_transfer_size(epq, buf_len, ep->maxpacket);
if (len == 0)
pr_info("%s: Sending ZERO packet: %d\n", __func__,
urb->transfer_flags & URB_ZERO_PACKET);
DBG(1, "%s: OUT len %d/%d/%d from URB\n", __func__, len, ep->maxpacket,
(int)buf_len);
break;
case USB_PID_SETUP:
toggle = 0;
dir = PTD_DIR_SETUP;
len = sizeof(struct usb_ctrlrequest);
DBG(1, "%s: SETUP len %d\n", __func__, len);
ep->data = urb->setup_packet;
break;
case USB_PID_ACK:
toggle = 1;
len = 0;
dir = (urb->transfer_buffer_length && usb_pipein(urb->pipe)) ?
PTD_DIR_OUT : PTD_DIR_IN;
DBG(1, "%s: ACK len %d\n", __func__, len);
break;
default:
toggle = dir = len = 0;
pr_err("%s@%d: ep->nextpid %02x\n", __func__, __LINE__, ep->nextpid);
BUG_ON(1);
}
ep->length = len;
if (!len)
ep->data = NULL;
ptd->count = PTD_CC_MSK | PTD_ACTIVE_MSK | PTD_TOGGLE(toggle);
ptd->mps = PTD_MPS(ep->maxpacket) | PTD_SPD(urb->dev->speed == USB_SPEED_LOW) |
PTD_EP(ep->epnum);
ptd->len = PTD_LEN(len) | PTD_DIR(dir);
ptd->faddr = PTD_FA(usb_pipedevice(urb->pipe));
if (usb_pipeint(urb->pipe)) {
ptd->faddr |= PTD_SF_INT(ep->branch);
ptd->faddr |= PTD_PR(ep->interval ? __ffs(ep->interval) : 0);
}
if (usb_pipeisoc(urb->pipe))
ptd->faddr |= PTD_SF_ISO(fno);
DBG(1, "%s: Finished\n", __func__);
}