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

   1 /* dvb-usb-urb.c is part of the DVB USB library.
   2  *
   3  * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de)
   4  * see dvb-usb-init.c for copyright information.
   5  *
   6  * This file contains functions for initializing and handling the
   7  * USB and URB stuff.
   8  */
   9 #include "dvb-usb-common.h"
  10
  11 int dvb_usb_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
  12         u16 rlen, int delay_ms)
  13 {
  14         int actlen,ret = -ENOMEM;
  15
  16         if (d->props.generic_bulk_ctrl_endpoint == 0) {
  17                 err("endpoint for generic control not specified.");
  18                 return -EINVAL;
  19         }
  20
  21         if (wbuf == NULL || wlen == 0)
  22                 return -EINVAL;
  23
  24         if ((ret = mutex_lock_interruptible(&d->usb_mutex)))
  25                 return ret;
  26
  27         deb_xfer(">>> ");
  28         debug_dump(wbuf,wlen,deb_xfer);
  29
  30         ret = usb_bulk_msg(d->udev,usb_sndbulkpipe(d->udev,
  31                         d->props.generic_bulk_ctrl_endpoint), wbuf,wlen,&actlen,
  32                         2000);
  33
  34         if (ret)
  35                 err("bulk message failed: %d (%d/%d)",ret,wlen,actlen);
  36         else
  37                 ret = actlen != wlen ? -1 : 0;
  38
  39         /* an answer is expected, and no error before */
  40         if (!ret && rbuf && rlen) {
  41                 if (delay_ms)
  42                         msleep(delay_ms);
  43
  44                 ret = usb_bulk_msg(d->udev,usb_rcvbulkpipe(d->udev,
  45                                 d->props.generic_bulk_ctrl_endpoint),rbuf,rlen,&actlen,
  46                                 2000);
  47
  48                 if (ret)
  49                         err("recv bulk message failed: %d",ret);
  50                 else {
  51                         deb_xfer("<<< ");
  52                         debug_dump(rbuf,actlen,deb_xfer);
  53                 }
  54         }
  55
  56         mutex_unlock(&d->usb_mutex);
  57         return ret;
  58 }
  59 EXPORT_SYMBOL(dvb_usb_generic_rw);
  60
  61 int dvb_usb_generic_write(struct dvb_usb_device *d, u8 *buf, u16 len)
  62 {
  63         return dvb_usb_generic_rw(d,buf,len,NULL,0,0);
  64 }
  65 EXPORT_SYMBOL(dvb_usb_generic_write);
  66
  67
  68 /* URB stuff for streaming */
  69 static void dvb_usb_urb_complete(struct urb *urb, struct pt_regs *ptregs)
  70 {
  71         struct dvb_usb_device *d = urb->context;
  72         int ptype = usb_pipetype(urb->pipe);
  73         int i;
  74         u8 *b;
  75
  76         deb_ts("'%s' urb completed. feedcount: %d, status: %d, length: %d/%d, pack_num: %d, errors: %d\n",
  77                         ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk", d->feedcount,
  78                         urb->status,urb->actual_length,urb->transfer_buffer_length,
  79                         urb->number_of_packets,urb->error_count);
  80
  81         switch (urb->status) {
  82                 case 0:         /* success */
  83                         break;
  84                 case -ECONNRESET:   /* kill */
  85                 case -ENOENT:
  86                 case -ESHUTDOWN:
  87                         return;
  88                 default:        /* error */
  89                         deb_ts("urb completition error %d.", urb->status);
  90                         break;
  91         }
  92
  93         if (d->feedcount > 0) {
  94                 if (d->state & DVB_USB_STATE_DVB) {
  95                         switch (ptype) {
  96                                 case PIPE_ISOCHRONOUS:
  97                                         b = (u8 *) urb->transfer_buffer;
  98                                         for (i = 0; i < urb->number_of_packets; i++) {
  99                                                 if (urb->iso_frame_desc[i].status != 0)
 100                                                         deb_ts("iso frame descriptor has an error: %d\n",urb->iso_frame_desc[i].status);
 101                                                 else if (urb->iso_frame_desc[i].actual_length > 0) {
 102                                                                 dvb_dmx_swfilter(&d->demux,b + urb->iso_frame_desc[i].offset,
 103                                                                                 urb->iso_frame_desc[i].actual_length);
 104                                                         }
 105                                                 urb->iso_frame_desc[i].status = 0;
 106                                                 urb->iso_frame_desc[i].actual_length = 0;
 107                                         }
 108                                         debug_dump(b,20,deb_ts);
 109                                         break;
 110                                 case PIPE_BULK:
 111                                         if (urb->actual_length > 0)
 112                                                 dvb_dmx_swfilter(&d->demux, (u8 *) urb->transfer_buffer,urb->actual_length);
 113                                         break;
 114                                 default:
 115                                         err("unkown endpoint type in completition handler.");
 116                                         return;
 117                         }
 118                 }
 119         }
 120
 121         usb_submit_urb(urb,GFP_ATOMIC);
 122 }
 123
 124 int dvb_usb_urb_kill(struct dvb_usb_device *d)
 125 {
 126         int i;
 127         for (i = 0; i < d->urbs_submitted; i++) {
 128                 deb_ts("killing URB no. %d.\n",i);
 129
 130                 /* stop the URB */
 131                 usb_kill_urb(d->urb_list[i]);
 132         }
 133         d->urbs_submitted = 0;
 134         return 0;
 135 }
 136
 137 int dvb_usb_urb_submit(struct dvb_usb_device *d)
 138 {
 139         int i,ret;
 140         for (i = 0; i < d->urbs_initialized; i++) {
 141                 deb_ts("submitting URB no. %d\n",i);
 142                 if ((ret = usb_submit_urb(d->urb_list[i],GFP_ATOMIC))) {
 143                         err("could not submit URB no. %d - get them all back",i);
 144                         dvb_usb_urb_kill(d);
 145                         return ret;
 146                 }
 147                 d->urbs_submitted++;
 148         }
 149         return 0;
 150 }
 151
 152 static int dvb_usb_free_stream_buffers(struct dvb_usb_device *d)
 153 {
 154         if (d->state & DVB_USB_STATE_URB_BUF) {
 155                 while (d->buf_num) {
 156                         d->buf_num--;
 157                         deb_mem("freeing buffer %d\n",d->buf_num);
 158                         usb_buffer_free(d->udev, d->buf_size,
 159                                         d->buf_list[d->buf_num], d->dma_addr[d->buf_num]);
 160                 }
 161                 kfree(d->buf_list);
 162                 kfree(d->dma_addr);
 163         }
 164
 165         d->state &= ~DVB_USB_STATE_URB_BUF;
 166
 167         return 0;
 168 }
 169
 170 static int dvb_usb_allocate_stream_buffers(struct dvb_usb_device *d, int num, unsigned long size)
 171 {
 172         d->buf_num = 0;
 173         d->buf_size = size;
 174
 175         deb_mem("all in all I will use %lu bytes for streaming\n",num*size);
 176
 177         if ((d->buf_list = kcalloc(num, sizeof(u8 *), GFP_ATOMIC)) == NULL)
 178                 return -ENOMEM;
 179
 180         if ((d->dma_addr = kcalloc(num, sizeof(dma_addr_t), GFP_ATOMIC)) == NULL) {
 181                 kfree(d->buf_list);
 182                 return -ENOMEM;
 183         }
 184
 185         d->state |= DVB_USB_STATE_URB_BUF;
 186
 187         for (d->buf_num = 0; d->buf_num < num; d->buf_num++) {
 188                 deb_mem("allocating buffer %d\n",d->buf_num);
 189                 if (( d->buf_list[d->buf_num] =
 190                                         usb_buffer_alloc(d->udev, size, SLAB_ATOMIC,
 191                                         &d->dma_addr[d->buf_num]) ) == NULL) {
 192                         deb_mem("not enough memory for urb-buffer allocation.\n");
 193                         dvb_usb_free_stream_buffers(d);
 194                         return -ENOMEM;
 195                 }
 196                 deb_mem("buffer %d: %p (dma: %llu)\n",
 197                         d->buf_num, d->buf_list[d->buf_num],
 198                         (unsigned long long)d->dma_addr[d->buf_num]);
 199                 memset(d->buf_list[d->buf_num],0,size);
 200         }
 201         deb_mem("allocation successful\n");
 202
 203         return 0;
 204 }
 205
 206 static int dvb_usb_bulk_urb_init(struct dvb_usb_device *d)
 207 {
 208         int i;
 209
 210         if ((i = dvb_usb_allocate_stream_buffers(d,d->props.urb.count,
 211                                         d->props.urb.u.bulk.buffersize)) < 0)
 212                 return i;
 213
 214         /* allocate the URBs */
 215         for (i = 0; i < d->props.urb.count; i++) {
 216                 if ((d->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC)) == NULL)
 217                         return -ENOMEM;
 218
 219                 usb_fill_bulk_urb( d->urb_list[i], d->udev,
 220                                 usb_rcvbulkpipe(d->udev,d->props.urb.endpoint),
 221                                 d->buf_list[i],
 222                                 d->props.urb.u.bulk.buffersize,
 223                                 dvb_usb_urb_complete, d);
 224
 225                 d->urb_list[i]->transfer_flags = 0;
 226                 d->urbs_initialized++;
 227         }
 228         return 0;
 229 }
 230
 231 static int dvb_usb_isoc_urb_init(struct dvb_usb_device *d)
 232 {
 233         int i,j;
 234
 235         if ((i = dvb_usb_allocate_stream_buffers(d,d->props.urb.count,
 236                                         d->props.urb.u.isoc.framesize*d->props.urb.u.isoc.framesperurb)) < 0)
 237                 return i;
 238
 239         /* allocate the URBs */
 240         for (i = 0; i < d->props.urb.count; i++) {
 241                 struct urb *urb;
 242                 int frame_offset = 0;
 243                 if ((d->urb_list[i] =
 244                                         usb_alloc_urb(d->props.urb.u.isoc.framesperurb,GFP_ATOMIC)) == NULL)
 245                         return -ENOMEM;
 246
 247                 urb = d->urb_list[i];
 248
 249                 urb->dev = d->udev;
 250                 urb->context = d;
 251                 urb->complete = dvb_usb_urb_complete;
 252                 urb->pipe = usb_rcvisocpipe(d->udev,d->props.urb.endpoint);
 253                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 254                 urb->interval = d->props.urb.u.isoc.interval;
 255                 urb->number_of_packets = d->props.urb.u.isoc.framesperurb;
 256                 urb->transfer_buffer_length = d->buf_size;
 257                 urb->transfer_buffer = d->buf_list[i];
 258                 urb->transfer_dma = d->dma_addr[i];
 259
 260                 for (j = 0; j < d->props.urb.u.isoc.framesperurb; j++) {
 261                         urb->iso_frame_desc[j].offset = frame_offset;
 262                         urb->iso_frame_desc[j].length = d->props.urb.u.isoc.framesize;
 263                         frame_offset += d->props.urb.u.isoc.framesize;
 264                 }
 265
 266                 d->urbs_initialized++;
 267         }
 268         return 0;
 269
 270 }
 271
 272 int dvb_usb_urb_init(struct dvb_usb_device *d)
 273 {
 274         /*
 275          * when reloading the driver w/o replugging the device
 276          * sometimes a timeout occures, this helps
 277          */
 278         if (d->props.generic_bulk_ctrl_endpoint != 0) {
 279                 usb_clear_halt(d->udev,usb_sndbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint));
 280                 usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint));
 281         }
 282         usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.urb.endpoint));
 283
 284         /* allocate the array for the data transfer URBs */
 285         d->urb_list = kzalloc(d->props.urb.count * sizeof(struct urb *),GFP_KERNEL);
 286         if (d->urb_list == NULL)
 287                 return -ENOMEM;
 288         d->state |= DVB_USB_STATE_URB_LIST;
 289
 290         switch (d->props.urb.type) {
 291                 case DVB_USB_BULK:
 292                         return dvb_usb_bulk_urb_init(d);
 293                 case DVB_USB_ISOC:
 294                         return dvb_usb_isoc_urb_init(d);
 295                 default:
 296                         err("unkown URB-type for data transfer.");
 297                         return -EINVAL;
 298         }
 299 }
 300
 301 int dvb_usb_urb_exit(struct dvb_usb_device *d)
 302 {
 303         int i;
 304
 305         dvb_usb_urb_kill(d);
 306
 307         if (d->state & DVB_USB_STATE_URB_LIST) {
 308                 for (i = 0; i < d->urbs_initialized; i++) {
 309                         if (d->urb_list[i] != NULL) {
 310                                 deb_mem("freeing URB no. %d.\n",i);
 311                                 /* free the URBs */
 312                                 usb_free_urb(d->urb_list[i]);
 313                         }
 314                 }
 315                 d->urbs_initialized = 0;
 316                 /* free the urb array */
 317                 kfree(d->urb_list);
 318                 d->state &= ~DVB_USB_STATE_URB_LIST;
 319         }
 320
 321         dvb_usb_free_stream_buffers(d);
 322         return 0;
 323 }