int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us)
{
unsigned int transfer_length = scsi_bufflen(srb);
unsigned int pipe = 0;
int result;
result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
US_CBI_ADSC,
USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
us->ifnum, srb->cmnd, srb->cmd_len);
US_DEBUGP("Call to usb_stor_ctrl_transfer() returned %d\n", result);
if (result == USB_STOR_XFER_STALLED) {
return USB_STOR_TRANSPORT_FAILED;
}
if (result != USB_STOR_XFER_GOOD) {
return USB_STOR_TRANSPORT_ERROR;
}
if (transfer_length) {
pipe = srb->sc_data_direction == DMA_FROM_DEVICE ?
us->recv_bulk_pipe : us->send_bulk_pipe;
result = usb_stor_bulk_srb(us, pipe, srb);
US_DEBUGP("CBI data stage result is 0x%x\n", result);
if (result == USB_STOR_XFER_STALLED)
return USB_STOR_TRANSPORT_FAILED;
if (result > USB_STOR_XFER_STALLED)
return USB_STOR_TRANSPORT_ERROR;
}
if (us->protocol != USB_PR_CBI)
return USB_STOR_TRANSPORT_GOOD;
result = usb_stor_intr_transfer(us, us->iobuf, 2);
US_DEBUGP("Got interrupt data (0x%x, 0x%x)\n",
us->iobuf[0], us->iobuf[1]);
if (result != USB_STOR_XFER_GOOD)
return USB_STOR_TRANSPORT_ERROR;
if (us->subclass == USB_SC_UFI) {
if (srb->cmnd[0] == REQUEST_SENSE ||
srb->cmnd[0] == INQUIRY)
return USB_STOR_TRANSPORT_GOOD;
if (us->iobuf[0])
goto Failed;
return USB_STOR_TRANSPORT_GOOD;
}
if (us->iobuf[0]) {
US_DEBUGP("CBI IRQ data showed reserved bType 0x%x\n",
us->iobuf[0]);
goto Failed;
}
switch (us->iobuf[1] & 0x0F) {
case 0x00:
return USB_STOR_TRANSPORT_GOOD;
case 0x01:
goto Failed;
}
return USB_STOR_TRANSPORT_ERROR;
Failed:
if (pipe)
usb_stor_clear_halt(us, pipe);
return USB_STOR_TRANSPORT_FAILED;
}
int usb_stor_CBI_transport(struct scsi_cmnd *srb, struct us_data *us)
{
unsigned int transfer_length = srb->request_bufflen;
unsigned int pipe = 0;
int result;
/* COMMAND STAGE */
/* let's send the command via the control pipe */
result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
US_CBI_ADSC,
USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
us->ifnum, srb->cmnd, srb->cmd_len);
/* check the return code for the command */
US_DEBUGP("Call to usb_stor_ctrl_transfer() returned %d\n", result);
/* if we stalled the command, it means command failed */
if (result == USB_STOR_XFER_STALLED) {
return USB_STOR_TRANSPORT_FAILED;
}
/* Uh oh... serious problem here */
if (result != USB_STOR_XFER_GOOD) {
return USB_STOR_TRANSPORT_ERROR;
}
/* DATA STAGE */
/* transfer the data payload for this command, if one exists*/
if (transfer_length) {
pipe = srb->sc_data_direction == DMA_FROM_DEVICE ?
us->recv_bulk_pipe : us->send_bulk_pipe;
result = usb_stor_bulk_transfer_sg(us, pipe,
srb->request_buffer, transfer_length,
srb->use_sg, &srb->resid);
US_DEBUGP("CBI data stage result is 0x%x\n", result);
/* if we stalled the data transfer it means command failed */
if (result == USB_STOR_XFER_STALLED)
return USB_STOR_TRANSPORT_FAILED;
if (result > USB_STOR_XFER_STALLED)
return USB_STOR_TRANSPORT_ERROR;
}
/* STATUS STAGE */
result = usb_stor_intr_transfer(us, us->iobuf, 2);
US_DEBUGP("Got interrupt data (0x%x, 0x%x)\n",
us->iobuf[0], us->iobuf[1]);
if (result != USB_STOR_XFER_GOOD)
return USB_STOR_TRANSPORT_ERROR;
/* UFI gives us ASC and ASCQ, like a request sense
*
* REQUEST_SENSE and INQUIRY don't affect the sense data on UFI
* devices, so we ignore the information for those commands. Note
* that this means we could be ignoring a real error on these
* commands, but that can't be helped.
*/
if (us->subclass == US_SC_UFI) {
if (srb->cmnd[0] == REQUEST_SENSE ||
srb->cmnd[0] == INQUIRY)
return USB_STOR_TRANSPORT_GOOD;
if (us->iobuf[0])
goto Failed;
return USB_STOR_TRANSPORT_GOOD;
}
/* If not UFI, we interpret the data as a result code
* The first byte should always be a 0x0.
*
* Some bogus devices don't follow that rule. They stuff the ASC
* into the first byte -- so if it's non-zero, call it a failure.
*/
if (us->iobuf[0]) {
_VMKLNX_USB_STOR_MSG("CBI IRQ data showed reserved bType 0x%x\n",
us->srb, us->iobuf[0]);
US_DEBUGP("CBI IRQ data showed reserved bType 0x%x\n",
us->iobuf[0]);
goto Failed;
}
/* The second byte & 0x0F should be 0x0 for good, otherwise error */
switch (us->iobuf[1] & 0x0F) {
case 0x00:
return USB_STOR_TRANSPORT_GOOD;
case 0x01:
goto Failed;
}
return USB_STOR_TRANSPORT_ERROR;
/* the CBI spec requires that the bulk pipe must be cleared
* following any data-in/out command failure (section 2.4.3.1.3)
*/
Failed:
if (pipe)
usb_stor_clear_halt(us, pipe);
return USB_STOR_TRANSPORT_FAILED;
}