drivers/media/video/videobuf-dvb.c

   1 /*
   2  *
   3  * some helper function for simple DVB cards which simply DMA the
   4  * complete transport stream and let the computer sort everything else
   5  * (i.e. we are using the software demux, ...).  Also uses the
   6  * video-buf to manage DMA buffers.
   7  *
   8  * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/device.h>
  19 #include <linux/fs.h>
  20 #include <linux/kthread.h>
  21 #include <linux/file.h>
  22
  23 #include <linux/freezer.h>
  24
  25 #include <media/videobuf-core.h>
  26 #include <media/videobuf-dvb.h>
  27
  28 /* ------------------------------------------------------------------ */
  29
  30 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
  31 MODULE_LICENSE("GPL");
  32
  33 static unsigned int debug;
  34 module_param(debug, int, 0644);
  35 MODULE_PARM_DESC(debug,"enable debug messages");
  36
  37 #define dprintk(fmt, arg...)    if (debug)                      \
  38         printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg)
  39
  40 /* ------------------------------------------------------------------ */
  41
  42 static int videobuf_dvb_thread(void *data)
  43 {
  44         struct videobuf_dvb *dvb = data;
  45         struct videobuf_buffer *buf;
  46         unsigned long flags;
  47         int err;
  48         void *outp;
  49
  50         dprintk("dvb thread started\n");
  51         set_freezable();
  52         videobuf_read_start(&dvb->dvbq);
  53
  54         for (;;) {
  55                 /* fetch next buffer */
  56                 buf = list_entry(dvb->dvbq.stream.next,
  57                                  struct videobuf_buffer, stream);
  58                 list_del(&buf->stream);
  59                 err = videobuf_waiton(buf,0,1);
  60
  61                 /* no more feeds left or stop_feed() asked us to quit */
  62                 if (0 == dvb->nfeeds)
  63                         break;
  64                 if (kthread_should_stop())
  65                         break;
  66                 try_to_freeze();
  67
  68                 /* feed buffer data to demux */
  69                 outp = videobuf_queue_to_vmalloc (&dvb->dvbq, buf);
  70
  71                 if (buf->state == VIDEOBUF_DONE)
  72                         dvb_dmx_swfilter(&dvb->demux, outp,
  73                                          buf->size);
  74
  75                 /* requeue buffer */
  76                 list_add_tail(&buf->stream,&dvb->dvbq.stream);
  77                 spin_lock_irqsave(dvb->dvbq.irqlock,flags);
  78                 dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
  79                 spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
  80         }
  81
  82         videobuf_read_stop(&dvb->dvbq);
  83         dprintk("dvb thread stopped\n");
  84
  85         /* Hmm, linux becomes *very* unhappy without this ... */
  86         while (!kthread_should_stop()) {
  87                 set_current_state(TASK_INTERRUPTIBLE);
  88                 schedule();
  89         }
  90         return 0;
  91 }
  92
  93 static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
  94 {
  95         struct dvb_demux *demux  = feed->demux;
  96         struct videobuf_dvb *dvb = demux->priv;
  97         int rc;
  98
  99         if (!demux->dmx.frontend)
 100                 return -EINVAL;
 101
 102         mutex_lock(&dvb->lock);
 103         dvb->nfeeds++;
 104         rc = dvb->nfeeds;
 105
 106         if (NULL != dvb->thread)
 107                 goto out;
 108         dvb->thread = kthread_run(videobuf_dvb_thread,
 109                                   dvb, "%s dvb", dvb->name);
 110         if (IS_ERR(dvb->thread)) {
 111                 rc = PTR_ERR(dvb->thread);
 112                 dvb->thread = NULL;
 113         }
 114
 115 out:
 116         mutex_unlock(&dvb->lock);
 117         return rc;
 118 }
 119
 120 static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
 121 {
 122         struct dvb_demux *demux  = feed->demux;
 123         struct videobuf_dvb *dvb = demux->priv;
 124         int err = 0;
 125
 126         mutex_lock(&dvb->lock);
 127         dvb->nfeeds--;
 128         if (0 == dvb->nfeeds  &&  NULL != dvb->thread) {
 129                 err = kthread_stop(dvb->thread);
 130                 dvb->thread = NULL;
 131         }
 132         mutex_unlock(&dvb->lock);
 133         return err;
 134 }
 135
 136 static int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe,
 137                           struct module *module,
 138                           void *adapter_priv,
 139                           struct device *device,
 140                           char *adapter_name,
 141                           short *adapter_nr,
 142                           int mfe_shared,
 143                           int (*fe_ioctl_override)(struct dvb_frontend *,
 144                                         unsigned int, void *, unsigned int))
 145 {
 146         int result;
 147
 148         mutex_init(&fe->lock);
 149
 150         /* register adapter */
 151         result = dvb_register_adapter(&fe->adapter, adapter_name, module,
 152                 device, adapter_nr);
 153         if (result < 0) {
 154                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 155                        adapter_name, result);
 156         }
 157         fe->adapter.priv = adapter_priv;
 158         fe->adapter.mfe_shared = mfe_shared;
 159         fe->adapter.fe_ioctl_override = fe_ioctl_override;
 160
 161         return result;
 162 }
 163
 164 static int videobuf_dvb_register_frontend(struct dvb_adapter *adapter,
 165         struct videobuf_dvb *dvb)
 166 {
 167         int result;
 168
 169         /* register frontend */
 170         result = dvb_register_frontend(adapter, dvb->frontend);
 171         if (result < 0) {
 172                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
 173                        dvb->name, result);
 174                 goto fail_frontend;
 175         }
 176
 177         /* register demux stuff */
 178         dvb->demux.dmx.capabilities =
 179                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 180                 DMX_MEMORY_BASED_FILTERING;
 181         dvb->demux.priv       = dvb;
 182         dvb->demux.filternum  = 256;
 183         dvb->demux.feednum    = 256;
 184         dvb->demux.start_feed = videobuf_dvb_start_feed;
 185         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
 186         result = dvb_dmx_init(&dvb->demux);
 187         if (result < 0) {
 188                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
 189                        dvb->name, result);
 190                 goto fail_dmx;
 191         }
 192
 193         dvb->dmxdev.filternum    = 256;
 194         dvb->dmxdev.demux        = &dvb->demux.dmx;
 195         dvb->dmxdev.capabilities = 0;
 196         result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
 197
 198         if (result < 0) {
 199                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
 200                        dvb->name, result);
 201                 goto fail_dmxdev;
 202         }
 203
 204         dvb->fe_hw.source = DMX_FRONTEND_0;
 205         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 206         if (result < 0) {
 207                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 208                        dvb->name, result);
 209                 goto fail_fe_hw;
 210         }
 211
 212         dvb->fe_mem.source = DMX_MEMORY_FE;
 213         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 214         if (result < 0) {
 215                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 216                        dvb->name, result);
 217                 goto fail_fe_mem;
 218         }
 219
 220         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 221         if (result < 0) {
 222                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
 223                        dvb->name, result);
 224                 goto fail_fe_conn;
 225         }
 226
 227         /* register network adapter */
 228         dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
 229         if (dvb->net.dvbdev == NULL) {
 230                 result = -ENOMEM;
 231                 goto fail_fe_conn;
 232         }
 233         return 0;
 234
 235 fail_fe_conn:
 236         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 237 fail_fe_mem:
 238         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 239 fail_fe_hw:
 240         dvb_dmxdev_release(&dvb->dmxdev);
 241 fail_dmxdev:
 242         dvb_dmx_release(&dvb->demux);
 243 fail_dmx:
 244         dvb_unregister_frontend(dvb->frontend);
 245 fail_frontend:
 246         dvb_frontend_detach(dvb->frontend);
 247         dvb->frontend = NULL;
 248
 249         return result;
 250 }
 251
 252 /* ------------------------------------------------------------------ */
 253 /* Register a single adapter and one or more frontends */
 254 int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
 255                           struct module *module,
 256                           void *adapter_priv,
 257                           struct device *device,
 258                           short *adapter_nr,
 259                           int mfe_shared,
 260                           int (*fe_ioctl_override)(struct dvb_frontend *,
 261                                         unsigned int, void *, unsigned int))
 262 {
 263         struct list_head *list, *q;
 264         struct videobuf_dvb_frontend *fe;
 265         int res;
 266
 267         fe = videobuf_dvb_get_frontend(f, 1);
 268         if (!fe) {
 269                 printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
 270                 return -EINVAL;
 271         }
 272
 273         /* Bring up the adapter */
 274         res = videobuf_dvb_register_adapter(f, module, adapter_priv, device,
 275                 fe->dvb.name, adapter_nr, mfe_shared, fe_ioctl_override);
 276         if (res < 0) {
 277                 printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
 278                 return res;
 279         }
 280
 281         /* Attach all of the frontends to the adapter */
 282         mutex_lock(&f->lock);
 283         list_for_each_safe(list, q, &f->felist) {
 284                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 285                 res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb);
 286                 if (res < 0) {
 287                         printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
 288                                 fe->dvb.name, res);
 289                         goto err;
 290                 }
 291         }
 292         mutex_unlock(&f->lock);
 293         return 0;
 294
 295 err:
 296         mutex_unlock(&f->lock);
 297         videobuf_dvb_unregister_bus(f);
 298         return res;
 299 }
 300 EXPORT_SYMBOL(videobuf_dvb_register_bus);
 301
 302 void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
 303 {
 304         videobuf_dvb_dealloc_frontends(f);
 305
 306         dvb_unregister_adapter(&f->adapter);
 307 }
 308 EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
 309
 310 struct videobuf_dvb_frontend *videobuf_dvb_get_frontend(
 311         struct videobuf_dvb_frontends *f, int id)
 312 {
 313         struct list_head *list, *q;
 314         struct videobuf_dvb_frontend *fe, *ret = NULL;
 315
 316         mutex_lock(&f->lock);
 317
 318         list_for_each_safe(list, q, &f->felist) {
 319                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 320                 if (fe->id == id) {
 321                         ret = fe;
 322                         break;
 323                 }
 324         }
 325
 326         mutex_unlock(&f->lock);
 327
 328         return ret;
 329 }
 330 EXPORT_SYMBOL(videobuf_dvb_get_frontend);
 331
 332 int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f,
 333         struct dvb_frontend *p)
 334 {
 335         struct list_head *list, *q;
 336         struct videobuf_dvb_frontend *fe = NULL;
 337         int ret = 0;
 338
 339         mutex_lock(&f->lock);
 340
 341         list_for_each_safe(list, q, &f->felist) {
 342                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 343                 if (fe->dvb.frontend == p) {
 344                         ret = fe->id;
 345                         break;
 346                 }
 347         }
 348
 349         mutex_unlock(&f->lock);
 350
 351         return ret;
 352 }
 353 EXPORT_SYMBOL(videobuf_dvb_find_frontend);
 354
 355 struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend(
 356         struct videobuf_dvb_frontends *f, int id)
 357 {
 358         struct videobuf_dvb_frontend *fe;
 359
 360         fe = kzalloc(sizeof(struct videobuf_dvb_frontend), GFP_KERNEL);
 361         if (fe == NULL)
 362                 goto fail_alloc;
 363
 364         fe->id = id;
 365         mutex_init(&fe->dvb.lock);
 366
 367         mutex_lock(&f->lock);
 368         list_add_tail(&fe->felist, &f->felist);
 369         mutex_unlock(&f->lock);
 370
 371 fail_alloc:
 372         return fe;
 373 }
 374 EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
 375
 376 void videobuf_dvb_dealloc_frontends(struct videobuf_dvb_frontends *f)
 377 {
 378         struct list_head *list, *q;
 379         struct videobuf_dvb_frontend *fe;
 380
 381         mutex_lock(&f->lock);
 382         list_for_each_safe(list, q, &f->felist) {
 383                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 384                 if (fe->dvb.net.dvbdev) {
 385                         dvb_net_release(&fe->dvb.net);
 386                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
 387                                 &fe->dvb.fe_mem);
 388                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
 389                                 &fe->dvb.fe_hw);
 390                         dvb_dmxdev_release(&fe->dvb.dmxdev);
 391                         dvb_dmx_release(&fe->dvb.demux);
 392                         dvb_unregister_frontend(fe->dvb.frontend);
 393                 }
 394                 if (fe->dvb.frontend)
 395                         /* always allocated, may have been reset */
 396                         dvb_frontend_detach(fe->dvb.frontend);
 397                 list_del(list); /* remove list entry */
 398                 kfree(fe);      /* free frontend allocation */
 399         }
 400         mutex_unlock(&f->lock);
 401 }
 402 EXPORT_SYMBOL(videobuf_dvb_dealloc_frontends);