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// SPDX-License-Identifier: GPL-2.0
/* usb-urb.c is part of the DVB USB library.
*
* Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
* see dvb-usb-init.c for copyright information.
*
* This file keeps functions for initializing and handling the
* BULK and ISOC USB data transfers in a generic way.
* Can be used for DVB-only and also, that's the plan, for
* Hybrid USB devices (analog and DVB).
*/
#include "dvb-usb-common.h"
/* URB stuff for streaming */
static void usb_urb_complete(struct urb *urb)
{
struct usb_data_stream *stream = urb->context;
int ptype = usb_pipetype(urb->pipe);
int i;
u8 *b;
deb_uxfer("'%s' urb completed. status: %d, length: %d/%d, pack_num: %d, errors: %d\n",
ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk",
urb->status,urb->actual_length,urb->transfer_buffer_length,
urb->number_of_packets,urb->error_count);
switch (urb->status) {
case 0: /* success */
case -ETIMEDOUT: /* NAK */
break;
case -ECONNRESET: /* kill */
case -ENOENT:
case -ESHUTDOWN:
return;
default: /* error */
deb_ts("urb completion error %d.\n", urb->status);
break;
}
b = (u8 *) urb->transfer_buffer;
switch (ptype) {
case PIPE_ISOCHRONOUS:
for (i = 0; i < urb->number_of_packets; i++) {
if (urb->iso_frame_desc[i].status != 0)
deb_ts("iso frame descriptor has an error: %d\n",urb->iso_frame_desc[i].status);
else if (urb->iso_frame_desc[i].actual_length > 0)
stream->complete(stream, b + urb->iso_frame_desc[i].offset, urb->iso_frame_desc[i].actual_length);
urb->iso_frame_desc[i].status = 0;
urb->iso_frame_desc[i].actual_length = 0;
}
debug_dump(b,20,deb_uxfer);
break;
case PIPE_BULK:
if (urb->actual_length > 0)
stream->complete(stream, b, urb->actual_length);
break;
default:
err("unknown endpoint type in completion handler.");
return;
}
usb_submit_urb(urb,GFP_ATOMIC);
}
int usb_urb_kill(struct usb_data_stream *stream)
{
int i;
for (i = 0; i < stream->urbs_submitted; i++) {
deb_ts("killing URB no. %d.\n",i);
/* stop the URB */
usb_kill_urb(stream->urb_list[i]);
}
stream->urbs_submitted = 0;
return 0;
}
int usb_urb_submit(struct usb_data_stream *stream)
{
int i,ret;
for (i = 0; i < stream->urbs_initialized; i++) {
deb_ts("submitting URB no. %d\n",i);
if ((ret = usb_submit_urb(stream->urb_list[i],GFP_ATOMIC))) {
err("could not submit URB no. %d - get them all back",i);
usb_urb_kill(stream);
return ret;
}
stream->urbs_submitted++;
}
return 0;
}
static int usb_free_stream_buffers(struct usb_data_stream *stream)
{
if (stream->state & USB_STATE_URB_BUF) {
while (stream->buf_num) {
stream->buf_num--;
deb_mem("freeing buffer %d\n",stream->buf_num);
usb_free_coherent(stream->udev, stream->buf_size,
stream->buf_list[stream->buf_num],
stream->dma_addr[stream->buf_num]);
}
}
stream->state &= ~USB_STATE_URB_BUF;
return 0;
}
static int usb_allocate_stream_buffers(struct usb_data_stream *stream, int num, unsigned long size)
{
stream->buf_num = 0;
stream->buf_size = size;
deb_mem("all in all I will use %lu bytes for streaming\n",num*size);
for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
deb_mem("allocating buffer %d\n",stream->buf_num);
if (( stream->buf_list[stream->buf_num] =
usb_alloc_coherent(stream->udev, size, GFP_KERNEL,
&stream->dma_addr[stream->buf_num]) ) == NULL) {
deb_mem("not enough memory for urb-buffer allocation.\n");
usb_free_stream_buffers(stream);
return -ENOMEM;
}
deb_mem("buffer %d: %p (dma: %Lu)\n",
stream->buf_num,
stream->buf_list[stream->buf_num], (long long)stream->dma_addr[stream->buf_num]);
memset(stream->buf_list[stream->buf_num],0,size);
stream->state |= USB_STATE_URB_BUF;
}
deb_mem("allocation successful\n");
return 0;
}
static int usb_bulk_urb_init(struct usb_data_stream *stream)
{
int i, j;
if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
stream->props.u.bulk.buffersize)) < 0)
return i;
/* allocate the URBs */
for (i = 0; i < stream->props.count; i++) {
stream->urb_list[i] = usb_alloc_urb(0, GFP_KERNEL);
if (!stream->urb_list[i]) {
deb_mem("not enough memory for urb_alloc_urb!.\n");
for (j = 0; j < i; j++)
usb_free_urb(stream->urb_list[j]);
return -ENOMEM;
}
usb_fill_bulk_urb( stream->urb_list[i], stream->udev,
usb_rcvbulkpipe(stream->udev,stream->props.endpoint),
stream->buf_list[i],
stream->props.u.bulk.buffersize,
usb_urb_complete, stream);
stream->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
stream->urb_list[i]->transfer_dma = stream->dma_addr[i];
stream->urbs_initialized++;
}
return 0;
}
static int usb_isoc_urb_init(struct usb_data_stream *stream)
{
int i,j;
if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
stream->props.u.isoc.framesize*stream->props.u.isoc.framesperurb)) < 0)
return i;
/* allocate the URBs */
for (i = 0; i < stream->props.count; i++) {
struct urb *urb;
int frame_offset = 0;
stream->urb_list[i] = usb_alloc_urb(stream->props.u.isoc.framesperurb, GFP_KERNEL);
if (!stream->urb_list[i]) {
deb_mem("not enough memory for urb_alloc_urb!\n");
for (j = 0; j < i; j++)
usb_free_urb(stream->urb_list[j]);
return -ENOMEM;
}
urb = stream->urb_list[i];
urb->dev = stream->udev;
urb->context = stream;
urb->complete = usb_urb_complete;
urb->pipe = usb_rcvisocpipe(stream->udev,stream->props.endpoint);
urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
urb->interval = stream->props.u.isoc.interval;
urb->number_of_packets = stream->props.u.isoc.framesperurb;
urb->transfer_buffer_length = stream->buf_size;
urb->transfer_buffer = stream->buf_list[i];
urb->transfer_dma = stream->dma_addr[i];
for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
urb->iso_frame_desc[j].offset = frame_offset;
urb->iso_frame_desc[j].length = stream->props.u.isoc.framesize;
frame_offset += stream->props.u.isoc.framesize;
}
stream->urbs_initialized++;
}
return 0;
}
int usb_urb_init(struct usb_data_stream *stream, struct usb_data_stream_properties *props)
{
if (stream == NULL || props == NULL)
return -EINVAL;
memcpy(&stream->props, props, sizeof(*props));
usb_clear_halt(stream->udev,usb_rcvbulkpipe(stream->udev,stream->props.endpoint));
if (stream->complete == NULL) {
err("there is no data callback - this doesn't make sense.");
return -EINVAL;
}
switch (stream->props.type) {
case USB_BULK:
return usb_bulk_urb_init(stream);
case USB_ISOC:
return usb_isoc_urb_init(stream);
default:
err("unknown URB-type for data transfer.");
return -EINVAL;
}
}
int usb_urb_exit(struct usb_data_stream *stream)
{
int i;
usb_urb_kill(stream);
for (i = 0; i < stream->urbs_initialized; i++) {
if (stream->urb_list[i] != NULL) {
deb_mem("freeing URB no. %d.\n",i);
/* free the URBs */
usb_free_urb(stream->urb_list[i]);
}
}
stream->urbs_initialized = 0;
usb_free_stream_buffers(stream);
return 0;
}
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