linux/drivers/media/dvb/dvb-usb/usb_urb.c

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/* usb-urb.c is part of the DVB USB library.
*
* Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.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 */
int usb_urb_reconfig(struct usb_data_stream *stream,
struct usb_data_stream_properties *props);
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;
pr_debug("%s: %s urb completed status=%d length=%d/%d" \
" pack_num=%d errors=%d\n", __func__,
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 */
pr_debug("%s: URB completition failed=%d\n", __func__,
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)
pr_debug("%s: iso frame descriptor has an " \
"error=%d\n", __func__,
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;
}
break;
case PIPE_BULK:
if (urb->actual_length > 0)
stream->complete(stream, b, urb->actual_length);
break;
default:
pr_err("%s: unknown endpoint type in completition handler",
KBUILD_MODNAME);
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++) {
pr_debug("%s: kill URB=%d\n", __func__, 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,
struct usb_data_stream_properties *props)
{
int i, ret;
if (props) {
ret = usb_urb_reconfig(stream, props);
if (ret < 0)
return ret;
}
for (i = 0; i < stream->urbs_initialized; i++) {
pr_debug("%s: submit URB=%d\n", __func__, i);
ret = usb_submit_urb(stream->urb_list[i], GFP_ATOMIC);
if (ret) {
pr_err("%s: could not submit URB no. %d - get them " \
"all back", KBUILD_MODNAME, i);
usb_urb_kill(stream);
return ret;
}
stream->urbs_submitted++;
}
return 0;
}
int usb_urb_free_urbs(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) {
pr_debug("%s: free URB=%d\n", __func__, i);
/* free the URBs */
usb_free_urb(stream->urb_list[i]);
}
}
stream->urbs_initialized = 0;
return 0;
}
static int usb_urb_alloc_bulk_urbs(struct usb_data_stream *stream)
{
int i, j;
/* allocate the URBs */
for (i = 0; i < stream->props.count; i++) {
pr_debug("%s: alloc URB=%d\n", __func__, i);
stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
if (!stream->urb_list[i]) {
pr_debug("%s: failed\n", __func__);
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_urb_alloc_isoc_urbs(struct usb_data_stream *stream)
{
int i, j;
/* allocate the URBs */
for (i = 0; i < stream->props.count; i++) {
struct urb *urb;
int frame_offset = 0;
pr_debug("%s: alloc URB=%d\n", __func__, i);
stream->urb_list[i] = usb_alloc_urb(
stream->props.u.isoc.framesperurb, GFP_ATOMIC);
if (!stream->urb_list[i]) {
pr_debug("%s: failed\n", __func__);
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->props.u.isoc.framesize *
stream->props.u.isoc.framesperurb;
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_free_stream_buffers(struct usb_data_stream *stream)
{
if (stream->state & USB_STATE_URB_BUF) {
while (stream->buf_num) {
stream->buf_num--;
pr_debug("%s: free buf=%d\n", __func__,
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;
}
int usb_alloc_stream_buffers(struct usb_data_stream *stream, int num,
unsigned long size)
{
stream->buf_num = 0;
stream->buf_size = size;
pr_debug("%s: all in all I will use %lu bytes for streaming\n",
__func__, num * size);
for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
pr_debug("%s: alloc buf=%d\n", __func__, stream->buf_num);
stream->buf_list[stream->buf_num] = usb_alloc_coherent(
stream->udev, size, GFP_ATOMIC,
&stream->dma_addr[stream->buf_num]);
if (stream->buf_list[stream->buf_num] == NULL) {
pr_debug("%s: failed\n", __func__);
usb_free_stream_buffers(stream);
return -ENOMEM;
}
pr_debug("%s: buf %d: %p (dma %llu)\n", __func__,
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;
}
return 0;
}
int usb_urb_reconfig(struct usb_data_stream *stream,
struct usb_data_stream_properties *props)
{
int buf_size;
if (props == NULL)
return 0;
/* check allocated buffers are large enough for the request */
if (props->type == USB_BULK) {
buf_size = stream->props.u.bulk.buffersize;
} else if (props->type == USB_ISOC) {
buf_size = props->u.isoc.framesize * props->u.isoc.framesperurb;
} else {
pr_err("%s: invalid endpoint type=%d", KBUILD_MODNAME,
props->type);
return -EINVAL;
}
if (stream->buf_num < props->count || stream->buf_size < buf_size) {
pr_err("%s: cannot reconfigure as allocated buffers are too " \
"small", KBUILD_MODNAME);
return -EINVAL;
}
/* check if all fields are same */
if (stream->props.type == props->type &&
stream->props.count == props->count &&
stream->props.endpoint == props->endpoint) {
if (props->type == USB_BULK &&
props->u.bulk.buffersize ==
stream->props.u.bulk.buffersize)
return 0;
else if (props->type == USB_ISOC &&
props->u.isoc.framesperurb ==
stream->props.u.isoc.framesperurb &&
props->u.isoc.framesize ==
stream->props.u.isoc.framesize &&
props->u.isoc.interval ==
stream->props.u.isoc.interval)
return 0;
}
pr_debug("%s: re-alloc URBs\n", __func__);
usb_urb_free_urbs(stream);
memcpy(&stream->props, props, sizeof(*props));
if (props->type == USB_BULK)
return usb_urb_alloc_bulk_urbs(stream);
else if (props->type == USB_ISOC)
return usb_urb_alloc_isoc_urbs(stream);
return 0;
}
int usb_urb_init(struct usb_data_stream *stream,
struct usb_data_stream_properties *props)
{
int ret;
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) {
pr_err("%s: there is no data callback - this doesn't make " \
"sense", KBUILD_MODNAME);
return -EINVAL;
}
switch (stream->props.type) {
case USB_BULK:
ret = usb_alloc_stream_buffers(stream, stream->props.count,
stream->props.u.bulk.buffersize);
if (ret < 0)
return ret;
return usb_urb_alloc_bulk_urbs(stream);
case USB_ISOC:
ret = usb_alloc_stream_buffers(stream, stream->props.count,
stream->props.u.isoc.framesize *
stream->props.u.isoc.framesperurb);
if (ret < 0)
return ret;
return usb_urb_alloc_isoc_urbs(stream);
default:
pr_err("%s: unknown URB-type for data transfer",
KBUILD_MODNAME);
return -EINVAL;
}
}
int usb_urb_exit(struct usb_data_stream *stream)
{
usb_urb_free_urbs(stream);
usb_free_stream_buffers(stream);
return 0;
}