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usb-urb.c

/* 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 */
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 completition 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("unkown endpoint type in completition 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_buffer_free(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_buffer_alloc(stream->udev, size, GFP_ATOMIC,
                              &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;

      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++) {
            if ((stream->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC)) == NULL)
                  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 = 0;
            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;
            if ((stream->urb_list[i] =
                              usb_alloc_urb(stream->props.u.isoc.framesperurb,GFP_ATOMIC)) == NULL)
                  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("unkown 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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