drivers/media/dvb/dvb-usb/usb-urb.c

   1 /* usb-urb.c is part of the DVB USB library.
   2  *
   3  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
   4  * see dvb-usb-init.c for copyright information.
   5  *
   6  * This file keeps functions for initializing and handling the
   7  * BULK and ISOC USB data transfers in a generic way.
   8  * Can be used for DVB-only and also, that's the plan, for
   9  * Hybrid USB devices (analog and DVB).
  10  */
  11 #include "dvb-usb-common.h"
  12
  13 /* URB stuff for streaming */
  14 static void usb_urb_complete(struct urb *urb, struct pt_regs *ptregs)
  15 {
  16         struct usb_data_stream *stream = urb->context;
  17         int ptype = usb_pipetype(urb->pipe);
  18         int i;
  19         u8 *b;
  20
  21         deb_uxfer("'%s' urb completed. status: %d, length: %d/%d, pack_num: %d, errors: %d\n",
  22                 ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk",
  23                 urb->status,urb->actual_length,urb->transfer_buffer_length,
  24                 urb->number_of_packets,urb->error_count);
  25
  26         switch (urb->status) {
  27                 case 0:         /* success */
  28                 case -ETIMEDOUT:    /* NAK */
  29                         break;
  30                 case -ECONNRESET:   /* kill */
  31                 case -ENOENT:
  32                 case -ESHUTDOWN:
  33                         return;
  34                 default:        /* error */
  35                         deb_ts("urb completition error %d.\n", urb->status);
  36                         break;
  37         }
  38
  39         b = (u8 *) urb->transfer_buffer;
  40         switch (ptype) {
  41                 case PIPE_ISOCHRONOUS:
  42                         for (i = 0; i < urb->number_of_packets; i++) {
  43
  44                                 if (urb->iso_frame_desc[i].status != 0)
  45                                         deb_ts("iso frame descriptor has an error: %d\n",urb->iso_frame_desc[i].status);
  46                                 else if (urb->iso_frame_desc[i].actual_length > 0)
  47                                         stream->complete(stream, b + urb->iso_frame_desc[i].offset, urb->iso_frame_desc[i].actual_length);
  48
  49                                 urb->iso_frame_desc[i].status = 0;
  50                                 urb->iso_frame_desc[i].actual_length = 0;
  51                         }
  52                         debug_dump(b,20,deb_uxfer);
  53                         break;
  54                 case PIPE_BULK:
  55                         if (urb->actual_length > 0)
  56                                 stream->complete(stream, b, urb->actual_length);
  57                         break;
  58                 default:
  59                         err("unkown endpoint type in completition handler.");
  60                         return;
  61         }
  62         usb_submit_urb(urb,GFP_ATOMIC);
  63 }
  64
  65 int usb_urb_kill(struct usb_data_stream *stream)
  66 {
  67         int i;
  68         for (i = 0; i < stream->urbs_submitted; i++) {
  69                 deb_ts("killing URB no. %d.\n",i);
  70
  71                 /* stop the URB */
  72                 usb_kill_urb(stream->urb_list[i]);
  73         }
  74         stream->urbs_submitted = 0;
  75         return 0;
  76 }
  77
  78 int usb_urb_submit(struct usb_data_stream *stream)
  79 {
  80         int i,ret;
  81         for (i = 0; i < stream->urbs_initialized; i++) {
  82                 deb_ts("submitting URB no. %d\n",i);
  83                 if ((ret = usb_submit_urb(stream->urb_list[i],GFP_ATOMIC))) {
  84                         err("could not submit URB no. %d - get them all back",i);
  85                         usb_urb_kill(stream);
  86                         return ret;
  87                 }
  88                 stream->urbs_submitted++;
  89         }
  90         return 0;
  91 }
  92
  93 static int usb_free_stream_buffers(struct usb_data_stream *stream)
  94 {
  95         if (stream->state & USB_STATE_URB_BUF) {
  96                 while (stream->buf_num) {
  97                         stream->buf_num--;
  98                         deb_mem("freeing buffer %d\n",stream->buf_num);
  99                         usb_buffer_free(stream->udev, stream->buf_size,
 100                                         stream->buf_list[stream->buf_num], stream->dma_addr[stream->buf_num]);
 101                 }
 102         }
 103
 104         stream->state &= ~USB_STATE_URB_BUF;
 105
 106         return 0;
 107 }
 108
 109 static int usb_allocate_stream_buffers(struct usb_data_stream *stream, int num, unsigned long size)
 110 {
 111         stream->buf_num = 0;
 112         stream->buf_size = size;
 113
 114         deb_mem("all in all I will use %lu bytes for streaming\n",num*size);
 115
 116         for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
 117                 deb_mem("allocating buffer %d\n",stream->buf_num);
 118                 if (( stream->buf_list[stream->buf_num] =
 119                                         usb_buffer_alloc(stream->udev, size, SLAB_ATOMIC,
 120                                         &stream->dma_addr[stream->buf_num]) ) == NULL) {
 121                         deb_mem("not enough memory for urb-buffer allocation.\n");
 122                         usb_free_stream_buffers(stream);
 123                         return -ENOMEM;
 124                 }
 125                 deb_mem("buffer %d: %p (dma: %u)\n",
 126                         stream->buf_num, stream->buf_list[stream->buf_num], stream->dma_addr[stream->buf_num]);
 127                 memset(stream->buf_list[stream->buf_num],0,size);
 128                 stream->state |= USB_STATE_URB_BUF;
 129         }
 130         deb_mem("allocation successful\n");
 131
 132         return 0;
 133 }
 134
 135 static int usb_bulk_urb_init(struct usb_data_stream *stream)
 136 {
 137         int i;
 138
 139         if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
 140                                         stream->props.u.bulk.buffersize)) < 0)
 141                 return i;
 142
 143         /* allocate the URBs */
 144         for (i = 0; i < stream->props.count; i++) {
 145                 if ((stream->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC)) == NULL)
 146                         return -ENOMEM;
 147
 148                 usb_fill_bulk_urb( stream->urb_list[i], stream->udev,
 149                                 usb_rcvbulkpipe(stream->udev,stream->props.endpoint),
 150                                 stream->buf_list[i],
 151                                 stream->props.u.bulk.buffersize,
 152                                 usb_urb_complete, stream);
 153
 154                 stream->urb_list[i]->transfer_flags = 0;
 155                 stream->urbs_initialized++;
 156         }
 157         return 0;
 158 }
 159
 160 static int usb_isoc_urb_init(struct usb_data_stream *stream)
 161 {
 162         int i,j;
 163
 164         if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
 165                                         stream->props.u.isoc.framesize*stream->props.u.isoc.framesperurb)) < 0)
 166                 return i;
 167
 168         /* allocate the URBs */
 169         for (i = 0; i < stream->props.count; i++) {
 170                 struct urb *urb;
 171                 int frame_offset = 0;
 172                 if ((stream->urb_list[i] =
 173                                         usb_alloc_urb(stream->props.u.isoc.framesperurb,GFP_ATOMIC)) == NULL)
 174                         return -ENOMEM;
 175
 176                 urb = stream->urb_list[i];
 177
 178                 urb->dev = stream->udev;
 179                 urb->context = stream;
 180                 urb->complete = usb_urb_complete;
 181                 urb->pipe = usb_rcvisocpipe(stream->udev,stream->props.endpoint);
 182                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 183                 urb->interval = stream->props.u.isoc.interval;
 184                 urb->number_of_packets = stream->props.u.isoc.framesperurb;
 185                 urb->transfer_buffer_length = stream->buf_size;
 186                 urb->transfer_buffer = stream->buf_list[i];
 187                 urb->transfer_dma = stream->dma_addr[i];
 188
 189                 for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
 190                         urb->iso_frame_desc[j].offset = frame_offset;
 191                         urb->iso_frame_desc[j].length = stream->props.u.isoc.framesize;
 192                         frame_offset += stream->props.u.isoc.framesize;
 193                 }
 194
 195                 stream->urbs_initialized++;
 196         }
 197         return 0;
 198 }
 199
 200 int usb_urb_init(struct usb_data_stream *stream, struct usb_data_stream_properties *props)
 201 {
 202         if (stream == NULL || props == NULL)
 203                 return -EINVAL;
 204
 205         memcpy(&stream->props, props, sizeof(*props));
 206
 207         usb_clear_halt(stream->udev,usb_rcvbulkpipe(stream->udev,stream->props.endpoint));
 208
 209         if (stream->complete == NULL) {
 210                 err("there is no data callback - this doesn't make sense.");
 211                 return -EINVAL;
 212         }
 213
 214         switch (stream->props.type) {
 215                 case USB_BULK:
 216                         return usb_bulk_urb_init(stream);
 217                 case USB_ISOC:
 218                         return usb_isoc_urb_init(stream);
 219                 default:
 220                         err("unkown URB-type for data transfer.");
 221                         return -EINVAL;
 222         }
 223 }
 224
 225 int usb_urb_exit(struct usb_data_stream *stream)
 226 {
 227         int i;
 228
 229         usb_urb_kill(stream);
 230
 231         for (i = 0; i < stream->urbs_initialized; i++) {
 232                 if (stream->urb_list[i] != NULL) {
 233                         deb_mem("freeing URB no. %d.\n",i);
 234                         /* free the URBs */
 235                         usb_free_urb(stream->urb_list[i]);
 236                 }
 237         }
 238         stream->urbs_initialized = 0;
 239
 240         usb_free_stream_buffers(stream);
 241         return 0;
 242 }