/*
* Transfer an entire SCSI command's worth of data payload over the bulk
* pipe.
*
* Note that this uses usb_stor_transfer_partial to achieve its goals -- this
* function simply determines if we're going to use scatter-gather or not,
* and acts appropriately. For now, it also re-interprets the error codes.
*/
void usb_stor_transfer(Scsi_Cmnd *srb, struct us_data* us)
{
int i;
int result = -1;
struct scatterlist *sg;
unsigned int total_transferred = 0;
unsigned int transfer_amount;
/* calculate how much we want to transfer */
transfer_amount = usb_stor_transfer_length(srb);
/* was someone foolish enough to request more data than available
* buffer space? */
if (transfer_amount > srb->request_bufflen)
transfer_amount = srb->request_bufflen;
/* are we scatter-gathering? */
if (srb->use_sg) {
/* loop over all the scatter gather structures and
* make the appropriate requests for each, until done
*/
sg = (struct scatterlist *) srb->request_buffer;
for (i = 0; i < srb->use_sg; i++) {
if (transfer_amount - total_transferred >=
sg[i].length) {
result = usb_stor_transfer_partial(us,
sg[i].address, sg[i].length);
total_transferred += sg[i].length;
} else
result = usb_stor_transfer_partial(us,
sg[i].address,
transfer_amount - total_transferred);
/* if we get an error, end the loop here */
if (result)
break;
}
}
else
/* no scatter-gather, just make the request */
result = usb_stor_transfer_partial(us, srb->request_buffer,
transfer_amount);
/* return the result in the data structure itself */
srb->result = result;
}
/*
* Transfer an entire SCSI command's worth of data payload over the bulk
* pipe.
*
* Note that this uses usb_stor_transfer_partial to achieve it's goals -- this
* function simply determines if we're going to use scatter-gather or not,
* and acts appropriately. For now, it also re-interprets the error codes.
*/
static void us_transfer_freecom(Scsi_Cmnd *srb, struct us_data* us, int transfer_amount)
{
int i;
int result = -1;
struct scatterlist *sg;
unsigned int total_transferred = 0;
/* was someone foolish enough to request more data than available
* buffer space? */
if (transfer_amount > srb->request_bufflen)
transfer_amount = srb->request_bufflen;
/* are we scatter-gathering? */
if (srb->use_sg) {
/* loop over all the scatter gather structures and
* make the appropriate requests for each, until done
*/
sg = (struct scatterlist *) srb->request_buffer;
for (i = 0; i < srb->use_sg; i++) {
US_DEBUGP("transfer_amount: %d and total_transferred: %d\n", transfer_amount, total_transferred);
/* End this if we're done */
if (transfer_amount == total_transferred)
break;
/* transfer the lesser of the next buffer or the
* remaining data */
if (transfer_amount - total_transferred >=
sg[i].length) {
result = usb_stor_transfer_partial(us,
sg[i].address, sg[i].length);
total_transferred += sg[i].length;
} else {
result = usb_stor_transfer_partial(us,
sg[i].address,
transfer_amount - total_transferred);
total_transferred += transfer_amount - total_transferred;
}
/* if we get an error, end the loop here */
if (result)
break;
}
}
else
/* no scatter-gather, just make the request */
result = usb_stor_transfer_partial(us, srb->request_buffer,
transfer_amount);
/* return the result in the data structure itself */
srb->result = result;
}
/*
* Transfer an entire SCSI command's worth of data payload over the bulk pipe.
*
* Note that this uses usb_stor_transfer_partial to achieve it's goals -- this
* function simply determines if we're going to use scatter-gather or not,
* and acts appropriately. For now, it also re-interprets the error codes.
*/
static void us_transfer(SCSI_CMD_T *srb, UMAS_DATA_T* umas)
{
int i;
int result = -1;
uint32_t total_transferred = 0;
uint32_t transfer_amount;
SCATTER_LIST_T *sg;
/* calculate how much we want to transfer */
transfer_amount = usb_stor_transfer_length(srb);
/* Was someone foolish enough to request more data than available buffer space? */
if(transfer_amount > srb->request_bufflen)
transfer_amount = srb->request_bufflen;
/* are we scatter-gathering? */
if(srb->use_sg)
{
/*
* loop over all the scatter gather structures and
* make the appropriate requests for each, until done
*/
sg = (SCATTER_LIST_T *) srb->request_buff;
for(i = 0; i < srb->use_sg; i++)
{
/* transfer the lesser of the next buffer or the remaining data */
if(transfer_amount - total_transferred >= sg[i].length)
{
result = usb_stor_transfer_partial(umas, sg[i].address, sg[i].length);
total_transferred += sg[i].length;
}
else
result = usb_stor_transfer_partial(umas, sg[i].address,
transfer_amount - total_transferred);
/* if we get an error, end the loop here */
if(result)
break;
}
}
else /* no scatter-gather, just make the request */
result = usb_stor_transfer_partial(umas, (char *)srb->request_buff, transfer_amount);
/* return the result in the data structure itself */
srb->result = result;
}
