kernel/drivers/media/usb/dvb-usb-v2/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
  15 int usb_urb_reconfig(struct usb_data_stream *stream,
  16                 struct usb_data_stream_properties *props);
  17
  18 static void usb_urb_complete(struct urb *urb)
  19 {
  20         struct usb_data_stream *stream = urb->context;
  21         int ptype = usb_pipetype(urb->pipe);
  22         int i;
  23         u8 *b;
  24
  25         dev_dbg_ratelimited(&stream->udev->dev,
  26                         "%s: %s urb completed status=%d length=%d/%d pack_num=%d errors=%d\n",
  27                         __func__, ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk",
  28                         urb->status, urb->actual_length,
  29                         urb->transfer_buffer_length,
  30                         urb->number_of_packets, urb->error_count);
  31
  32         switch (urb->status) {
  33         case 0:         /* success */
  34         case -ETIMEDOUT:    /* NAK */
  35                 break;
  36         case -ECONNRESET:   /* kill */
  37         case -ENOENT:
  38         case -ESHUTDOWN:
  39                 return;
  40         default:        /* error */
  41                 dev_dbg_ratelimited(&stream->udev->dev,
  42                                 "%s: urb completition failed=%d\n",
  43                                 __func__, urb->status);
  44                 break;
  45         }
  46
  47         b = (u8 *) urb->transfer_buffer;
  48         switch (ptype) {
  49         case PIPE_ISOCHRONOUS:
  50                 for (i = 0; i < urb->number_of_packets; i++) {
  51                         if (urb->iso_frame_desc[i].status != 0)
  52                                 dev_dbg(&stream->udev->dev,
  53                                                 "%s: iso frame descriptor has an error=%d\n",
  54                                                 __func__,
  55                                                 urb->iso_frame_desc[i].status);
  56                         else if (urb->iso_frame_desc[i].actual_length > 0)
  57                                 stream->complete(stream,
  58                                         b + urb->iso_frame_desc[i].offset,
  59                                         urb->iso_frame_desc[i].actual_length);
  60
  61                         urb->iso_frame_desc[i].status = 0;
  62                         urb->iso_frame_desc[i].actual_length = 0;
  63                 }
  64                 break;
  65         case PIPE_BULK:
  66                 if (urb->actual_length > 0)
  67                         stream->complete(stream, b, urb->actual_length);
  68                 break;
  69         default:
  70                 dev_err(&stream->udev->dev,
  71                                 "%s: unknown endpoint type in completition handler\n",
  72                                 KBUILD_MODNAME);
  73                 return;
  74         }
  75         usb_submit_urb(urb, GFP_ATOMIC);
  76 }
  77
  78 int usb_urb_killv2(struct usb_data_stream *stream)
  79 {
  80         int i;
  81         for (i = 0; i < stream->urbs_submitted; i++) {
  82                 dev_dbg(&stream->udev->dev, "%s: kill urb=%d\n", __func__, i);
  83                 /* stop the URB */
  84                 usb_kill_urb(stream->urb_list[i]);
  85         }
  86         stream->urbs_submitted = 0;
  87         return 0;
  88 }
  89
  90 int usb_urb_submitv2(struct usb_data_stream *stream,
  91                 struct usb_data_stream_properties *props)
  92 {
  93         int i, ret;
  94
  95         if (props) {
  96                 ret = usb_urb_reconfig(stream, props);
  97                 if (ret < 0)
  98                         return ret;
  99         }
 100
 101         for (i = 0; i < stream->urbs_initialized; i++) {
 102                 dev_dbg(&stream->udev->dev, "%s: submit urb=%d\n", __func__, i);
 103                 ret = usb_submit_urb(stream->urb_list[i], GFP_ATOMIC);
 104                 if (ret) {
 105                         dev_err(&stream->udev->dev,
 106                                         "%s: could not submit urb no. %d - get them all back\n",
 107                                         KBUILD_MODNAME, i);
 108                         usb_urb_killv2(stream);
 109                         return ret;
 110                 }
 111                 stream->urbs_submitted++;
 112         }
 113         return 0;
 114 }
 115
 116 static int usb_urb_free_urbs(struct usb_data_stream *stream)
 117 {
 118         int i;
 119
 120         usb_urb_killv2(stream);
 121
 122         for (i = stream->urbs_initialized - 1; i >= 0; i--) {
 123                 if (stream->urb_list[i]) {
 124                         dev_dbg(&stream->udev->dev, "%s: free urb=%d\n",
 125                                         __func__, i);
 126                         /* free the URBs */
 127                         usb_free_urb(stream->urb_list[i]);
 128                 }
 129         }
 130         stream->urbs_initialized = 0;
 131
 132         return 0;
 133 }
 134
 135 static int usb_urb_alloc_bulk_urbs(struct usb_data_stream *stream)
 136 {
 137         int i, j;
 138
 139         /* allocate the URBs */
 140         for (i = 0; i < stream->props.count; i++) {
 141                 dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);
 142                 stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
 143                 if (!stream->urb_list[i]) {
 144                         dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);
 145                         for (j = 0; j < i; j++)
 146                                 usb_free_urb(stream->urb_list[j]);
 147                         return -ENOMEM;
 148                 }
 149                 usb_fill_bulk_urb(stream->urb_list[i],
 150                                 stream->udev,
 151                                 usb_rcvbulkpipe(stream->udev,
 152                                                 stream->props.endpoint),
 153                                 stream->buf_list[i],
 154                                 stream->props.u.bulk.buffersize,
 155                                 usb_urb_complete, stream);
 156
 157                 stream->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 158                 stream->urb_list[i]->transfer_dma = stream->dma_addr[i];
 159                 stream->urbs_initialized++;
 160         }
 161         return 0;
 162 }
 163
 164 static int usb_urb_alloc_isoc_urbs(struct usb_data_stream *stream)
 165 {
 166         int i, j;
 167
 168         /* allocate the URBs */
 169         for (i = 0; i < stream->props.count; i++) {
 170                 struct urb *urb;
 171                 int frame_offset = 0;
 172                 dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);
 173                 stream->urb_list[i] = usb_alloc_urb(
 174                                 stream->props.u.isoc.framesperurb, GFP_ATOMIC);
 175                 if (!stream->urb_list[i]) {
 176                         dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);
 177                         for (j = 0; j < i; j++)
 178                                 usb_free_urb(stream->urb_list[j]);
 179                         return -ENOMEM;
 180                 }
 181
 182                 urb = stream->urb_list[i];
 183
 184                 urb->dev = stream->udev;
 185                 urb->context = stream;
 186                 urb->complete = usb_urb_complete;
 187                 urb->pipe = usb_rcvisocpipe(stream->udev,
 188                                 stream->props.endpoint);
 189                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 190                 urb->interval = stream->props.u.isoc.interval;
 191                 urb->number_of_packets = stream->props.u.isoc.framesperurb;
 192                 urb->transfer_buffer_length = stream->props.u.isoc.framesize *
 193                                 stream->props.u.isoc.framesperurb;
 194                 urb->transfer_buffer = stream->buf_list[i];
 195                 urb->transfer_dma = stream->dma_addr[i];
 196
 197                 for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
 198                         urb->iso_frame_desc[j].offset = frame_offset;
 199                         urb->iso_frame_desc[j].length =
 200                                         stream->props.u.isoc.framesize;
 201                         frame_offset += stream->props.u.isoc.framesize;
 202                 }
 203
 204                 stream->urbs_initialized++;
 205         }
 206         return 0;
 207 }
 208
 209 static int usb_free_stream_buffers(struct usb_data_stream *stream)
 210 {
 211         if (stream->state & USB_STATE_URB_BUF) {
 212                 while (stream->buf_num) {
 213                         stream->buf_num--;
 214                         dev_dbg(&stream->udev->dev, "%s: free buf=%d\n",
 215                                 __func__, stream->buf_num);
 216                         usb_free_coherent(stream->udev, stream->buf_size,
 217                                           stream->buf_list[stream->buf_num],
 218                                           stream->dma_addr[stream->buf_num]);
 219                 }
 220         }
 221
 222         stream->state &= ~USB_STATE_URB_BUF;
 223
 224         return 0;
 225 }
 226
 227 static int usb_alloc_stream_buffers(struct usb_data_stream *stream, int num,
 228                                     unsigned long size)
 229 {
 230         stream->buf_num = 0;
 231         stream->buf_size = size;
 232
 233         dev_dbg(&stream->udev->dev,
 234                         "%s: all in all I will use %lu bytes for streaming\n",
 235                         __func__,  num * size);
 236
 237         for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
 238                 stream->buf_list[stream->buf_num] = usb_alloc_coherent(
 239                                 stream->udev, size, GFP_ATOMIC,
 240                                 &stream->dma_addr[stream->buf_num]);
 241                 if (!stream->buf_list[stream->buf_num]) {
 242                         dev_dbg(&stream->udev->dev, "%s: alloc buf=%d failed\n",
 243                                         __func__, stream->buf_num);
 244                         usb_free_stream_buffers(stream);
 245                         return -ENOMEM;
 246                 }
 247
 248                 dev_dbg(&stream->udev->dev, "%s: alloc buf=%d %p (dma %llu)\n",
 249                                 __func__, stream->buf_num,
 250                                 stream->buf_list[stream->buf_num],
 251                                 (long long)stream->dma_addr[stream->buf_num]);
 252                 memset(stream->buf_list[stream->buf_num], 0, size);
 253                 stream->state |= USB_STATE_URB_BUF;
 254         }
 255
 256         return 0;
 257 }
 258
 259 int usb_urb_reconfig(struct usb_data_stream *stream,
 260                 struct usb_data_stream_properties *props)
 261 {
 262         int buf_size;
 263
 264         if (!props)
 265                 return 0;
 266
 267         /* check allocated buffers are large enough for the request */
 268         if (props->type == USB_BULK) {
 269                 buf_size = stream->props.u.bulk.buffersize;
 270         } else if (props->type == USB_ISOC) {
 271                 buf_size = props->u.isoc.framesize * props->u.isoc.framesperurb;
 272         } else {
 273                 dev_err(&stream->udev->dev, "%s: invalid endpoint type=%d\n",
 274                                 KBUILD_MODNAME, props->type);
 275                 return -EINVAL;
 276         }
 277
 278         if (stream->buf_num < props->count || stream->buf_size < buf_size) {
 279                 dev_err(&stream->udev->dev,
 280                                 "%s: cannot reconfigure as allocated buffers are too small\n",
 281                                 KBUILD_MODNAME);
 282                 return -EINVAL;
 283         }
 284
 285         /* check if all fields are same */
 286         if (stream->props.type == props->type &&
 287                         stream->props.count == props->count &&
 288                         stream->props.endpoint == props->endpoint) {
 289                 if (props->type == USB_BULK &&
 290                                 props->u.bulk.buffersize ==
 291                                 stream->props.u.bulk.buffersize)
 292                         return 0;
 293                 else if (props->type == USB_ISOC &&
 294                                 props->u.isoc.framesperurb ==
 295                                 stream->props.u.isoc.framesperurb &&
 296                                 props->u.isoc.framesize ==
 297                                 stream->props.u.isoc.framesize &&
 298                                 props->u.isoc.interval ==
 299                                 stream->props.u.isoc.interval)
 300                         return 0;
 301         }
 302
 303         dev_dbg(&stream->udev->dev, "%s: re-alloc urbs\n", __func__);
 304
 305         usb_urb_free_urbs(stream);
 306         memcpy(&stream->props, props, sizeof(*props));
 307         if (props->type == USB_BULK)
 308                 return usb_urb_alloc_bulk_urbs(stream);
 309         else if (props->type == USB_ISOC)
 310                 return usb_urb_alloc_isoc_urbs(stream);
 311
 312         return 0;
 313 }
 314
 315 int usb_urb_initv2(struct usb_data_stream *stream,
 316                 const struct usb_data_stream_properties *props)
 317 {
 318         int ret;
 319
 320         if (!stream || !props)
 321                 return -EINVAL;
 322
 323         memcpy(&stream->props, props, sizeof(*props));
 324
 325         if (!stream->complete) {
 326                 dev_err(&stream->udev->dev,
 327                                 "%s: there is no data callback - this doesn't make sense\n",
 328                                 KBUILD_MODNAME);
 329                 return -EINVAL;
 330         }
 331
 332         switch (stream->props.type) {
 333         case USB_BULK:
 334                 ret = usb_alloc_stream_buffers(stream, stream->props.count,
 335                                 stream->props.u.bulk.buffersize);
 336                 if (ret < 0)
 337                         return ret;
 338
 339                 return usb_urb_alloc_bulk_urbs(stream);
 340         case USB_ISOC:
 341                 ret = usb_alloc_stream_buffers(stream, stream->props.count,
 342                                 stream->props.u.isoc.framesize *
 343                                 stream->props.u.isoc.framesperurb);
 344                 if (ret < 0)
 345                         return ret;
 346
 347                 return usb_urb_alloc_isoc_urbs(stream);
 348         default:
 349                 dev_err(&stream->udev->dev,
 350                                 "%s: unknown urb-type for data transfer\n",
 351                                 KBUILD_MODNAME);
 352                 return -EINVAL;
 353         }
 354 }
 355
 356 int usb_urb_exitv2(struct usb_data_stream *stream)
 357 {
 358         usb_urb_free_urbs(stream);
 359         usb_free_stream_buffers(stream);
 360
 361         return 0;
 362 }