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                 case -ETIMEDOUT:    /* NAK */
  84                         break;
  85                 case -ECONNRESET:   /* kill */
  86                 case -ENOENT:
  87                 case -ESHUTDOWN:
  88                         return;
  89                 default:        /* error */
  90                         deb_ts("urb completition error %d.", urb->status);
  91                         break;
  92         }
  93
  94         if (d->feedcount > 0) {
  95                 if (d->state & DVB_USB_STATE_DVB) {
  96                         switch (ptype) {
  97                                 case PIPE_ISOCHRONOUS:
  98                                         b = (u8 *) urb->transfer_buffer;
  99                                         for (i = 0; i < urb->number_of_packets; i++) {
 100                                                 if (urb->iso_frame_desc[i].status != 0)
 101                                                         deb_ts("iso frame descriptor has an error: %d\n",urb->iso_frame_desc[i].status);
 102                                                 else if (urb->iso_frame_desc[i].actual_length > 0) {
 103                                                                 dvb_dmx_swfilter(&d->demux,b + urb->iso_frame_desc[i].offset,
 104                                                                                 urb->iso_frame_desc[i].actual_length);
 105                                                         }
 106                                                 urb->iso_frame_desc[i].status = 0;
 107                                                 urb->iso_frame_desc[i].actual_length = 0;
 108                                         }
 109                                         debug_dump(b,20,deb_ts);
 110                                         break;
 111                                 case PIPE_BULK:
 112                                         if (urb->actual_length > 0)
 113                                                 dvb_dmx_swfilter(&d->demux, (u8 *) urb->transfer_buffer,urb->actual_length);
 114                                         break;
 115                                 default:
 116                                         err("unkown endpoint type in completition handler.");
 117                                         return;
 118                         }
 119                 }
 120         }
 121
 122         usb_submit_urb(urb,GFP_ATOMIC);
 123 }
 124
 125 int dvb_usb_urb_kill(struct dvb_usb_device *d)
 126 {
 127         int i;
 128         for (i = 0; i < d->urbs_submitted; i++) {
 129                 deb_ts("killing URB no. %d.\n",i);
 130
 131                 /* stop the URB */
 132                 usb_kill_urb(d->urb_list[i]);
 133         }
 134         d->urbs_submitted = 0;
 135         return 0;
 136 }
 137
 138 int dvb_usb_urb_submit(struct dvb_usb_device *d)
 139 {
 140         int i,ret;
 141         for (i = 0; i < d->urbs_initialized; i++) {
 142                 deb_ts("submitting URB no. %d\n",i);
 143                 if ((ret = usb_submit_urb(d->urb_list[i],GFP_ATOMIC))) {
 144                         err("could not submit URB no. %d - get them all back",i);
 145                         dvb_usb_urb_kill(d);
 146                         return ret;
 147                 }
 148                 d->urbs_submitted++;
 149         }
 150         return 0;
 151 }
 152
 153 static int dvb_usb_free_stream_buffers(struct dvb_usb_device *d)
 154 {
 155         if (d->state & DVB_USB_STATE_URB_BUF) {
 156                 while (d->buf_num) {
 157                         d->buf_num--;
 158                         deb_mem("freeing buffer %d\n",d->buf_num);
 159                         usb_buffer_free(d->udev, d->buf_size,
 160                                         d->buf_list[d->buf_num], d->dma_addr[d->buf_num]);
 161                 }
 162                 kfree(d->buf_list);
 163                 kfree(d->dma_addr);
 164         }
 165
 166         d->state &= ~DVB_USB_STATE_URB_BUF;
 167
 168         return 0;
 169 }
 170
 171 static int dvb_usb_allocate_stream_buffers(struct dvb_usb_device *d, int num, unsigned long size)
 172 {
 173         d->buf_num = 0;
 174         d->buf_size = size;
 175
 176         deb_mem("all in all I will use %lu bytes for streaming\n",num*size);
 177
 178         if ((d->buf_list = kcalloc(num, sizeof(u8 *), GFP_ATOMIC)) == NULL)
 179                 return -ENOMEM;
 180
 181         if ((d->dma_addr = kcalloc(num, sizeof(dma_addr_t), GFP_ATOMIC)) == NULL) {
 182                 kfree(d->buf_list);
 183                 return -ENOMEM;
 184         }
 185
 186         d->state |= DVB_USB_STATE_URB_BUF;
 187
 188         for (d->buf_num = 0; d->buf_num < num; d->buf_num++) {
 189                 deb_mem("allocating buffer %d\n",d->buf_num);
 190                 if (( d->buf_list[d->buf_num] =
 191                                         usb_buffer_alloc(d->udev, size, SLAB_ATOMIC,
 192                                         &d->dma_addr[d->buf_num]) ) == NULL) {
 193                         deb_mem("not enough memory for urb-buffer allocation.\n");
 194                         dvb_usb_free_stream_buffers(d);
 195                         return -ENOMEM;
 196                 }
 197                 deb_mem("buffer %d: %p (dma: %llu)\n",
 198                         d->buf_num, d->buf_list[d->buf_num],
 199                         (unsigned long long)d->dma_addr[d->buf_num]);
 200                 memset(d->buf_list[d->buf_num],0,size);
 201         }
 202         deb_mem("allocation successful\n");
 203
 204         return 0;
 205 }
 206
 207 static int dvb_usb_bulk_urb_init(struct dvb_usb_device *d)
 208 {
 209         int i;
 210
 211         if ((i = dvb_usb_allocate_stream_buffers(d,d->props.urb.count,
 212                                         d->props.urb.u.bulk.buffersize)) < 0)
 213                 return i;
 214
 215         /* allocate the URBs */
 216         for (i = 0; i < d->props.urb.count; i++) {
 217                 if ((d->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC)) == NULL)
 218                         return -ENOMEM;
 219
 220                 usb_fill_bulk_urb( d->urb_list[i], d->udev,
 221                                 usb_rcvbulkpipe(d->udev,d->props.urb.endpoint),
 222                                 d->buf_list[i],
 223                                 d->props.urb.u.bulk.buffersize,
 224                                 dvb_usb_urb_complete, d);
 225
 226                 d->urb_list[i]->transfer_flags = 0;
 227                 d->urbs_initialized++;
 228         }
 229         return 0;
 230 }
 231
 232 static int dvb_usb_isoc_urb_init(struct dvb_usb_device *d)
 233 {
 234         int i,j;
 235
 236         if ((i = dvb_usb_allocate_stream_buffers(d,d->props.urb.count,
 237                                         d->props.urb.u.isoc.framesize*d->props.urb.u.isoc.framesperurb)) < 0)
 238                 return i;
 239
 240         /* allocate the URBs */
 241         for (i = 0; i < d->props.urb.count; i++) {
 242                 struct urb *urb;
 243                 int frame_offset = 0;
 244                 if ((d->urb_list[i] =
 245                                         usb_alloc_urb(d->props.urb.u.isoc.framesperurb,GFP_ATOMIC)) == NULL)
 246                         return -ENOMEM;
 247
 248                 urb = d->urb_list[i];
 249
 250                 urb->dev = d->udev;
 251                 urb->context = d;
 252                 urb->complete = dvb_usb_urb_complete;
 253                 urb->pipe = usb_rcvisocpipe(d->udev,d->props.urb.endpoint);
 254                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 255                 urb->interval = d->props.urb.u.isoc.interval;
 256                 urb->number_of_packets = d->props.urb.u.isoc.framesperurb;
 257                 urb->transfer_buffer_length = d->buf_size;
 258                 urb->transfer_buffer = d->buf_list[i];
 259                 urb->transfer_dma = d->dma_addr[i];
 260
 261                 for (j = 0; j < d->props.urb.u.isoc.framesperurb; j++) {
 262                         urb->iso_frame_desc[j].offset = frame_offset;
 263                         urb->iso_frame_desc[j].length = d->props.urb.u.isoc.framesize;
 264                         frame_offset += d->props.urb.u.isoc.framesize;
 265                 }
 266
 267                 d->urbs_initialized++;
 268         }
 269         return 0;
 270
 271 }
 272
 273 int dvb_usb_urb_init(struct dvb_usb_device *d)
 274 {
 275         /*
 276          * when reloading the driver w/o replugging the device
 277          * sometimes a timeout occures, this helps
 278          */
 279         if (d->props.generic_bulk_ctrl_endpoint != 0) {
 280                 usb_clear_halt(d->udev,usb_sndbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint));
 281                 usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.generic_bulk_ctrl_endpoint));
 282         }
 283         usb_clear_halt(d->udev,usb_rcvbulkpipe(d->udev,d->props.urb.endpoint));
 284
 285         /* allocate the array for the data transfer URBs */
 286         d->urb_list = kzalloc(d->props.urb.count * sizeof(struct urb *),GFP_KERNEL);
 287         if (d->urb_list == NULL)
 288                 return -ENOMEM;
 289         d->state |= DVB_USB_STATE_URB_LIST;
 290
 291         switch (d->props.urb.type) {
 292                 case DVB_USB_BULK:
 293                         return dvb_usb_bulk_urb_init(d);
 294                 case DVB_USB_ISOC:
 295                         return dvb_usb_isoc_urb_init(d);
 296                 default:
 297                         err("unkown URB-type for data transfer.");
 298                         return -EINVAL;
 299         }
 300 }
 301
 302 int dvb_usb_urb_exit(struct dvb_usb_device *d)
 303 {
 304         int i;
 305
 306         dvb_usb_urb_kill(d);
 307
 308         if (d->state & DVB_USB_STATE_URB_LIST) {
 309                 for (i = 0; i < d->urbs_initialized; i++) {
 310                         if (d->urb_list[i] != NULL) {
 311                                 deb_mem("freeing URB no. %d.\n",i);
 312                                 /* free the URBs */
 313                                 usb_free_urb(d->urb_list[i]);
 314                         }
 315                 }
 316                 d->urbs_initialized = 0;
 317                 /* free the urb array */
 318                 kfree(d->urb_list);
 319                 d->state &= ~DVB_USB_STATE_URB_LIST;
 320         }
 321
 322         dvb_usb_free_stream_buffers(d);
 323         return 0;
 324 }