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                 // FIXME: cx8802_cancel_buffers(dev);
 130                 err = kthread_stop(dvb->thread);
 131                 dvb->thread = NULL;
 132         }
 133         mutex_unlock(&dvb->lock);
 134         return err;
 135 }
 136
 137 /* ------------------------------------------------------------------ */
 138 /* Register a single adapter and one or more frontends */
 139 int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
 140                           struct module *module,
 141                           void *adapter_priv,
 142                           struct device *device,
 143                           short *adapter_nr,
 144                           int mfe_shared)
 145 {
 146         struct list_head *list, *q;
 147         struct videobuf_dvb_frontend *fe;
 148         int res;
 149
 150         fe = videobuf_dvb_get_frontend(f, 1);
 151         if (!fe) {
 152                 printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
 153                 return -EINVAL;
 154         }
 155
 156         /* Bring up the adapter */
 157         res = videobuf_dvb_register_adapter(f, module, adapter_priv, device, fe->dvb.name, adapter_nr, mfe_shared);
 158         if (res < 0) {
 159                 printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
 160                 return res;
 161         }
 162
 163         /* Attach all of the frontends to the adapter */
 164         mutex_lock(&f->lock);
 165         list_for_each_safe(list, q, &f->felist) {
 166                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 167                 res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb);
 168                 if (res < 0) {
 169                         printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
 170                                 fe->dvb.name, res);
 171                         goto err;
 172                 }
 173         }
 174         mutex_unlock(&f->lock);
 175         return 0;
 176
 177 err:
 178         mutex_unlock(&f->lock);
 179         videobuf_dvb_unregister_bus(f);
 180         return res;
 181 }
 182
 183 int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe,
 184                           struct module *module,
 185                           void *adapter_priv,
 186                           struct device *device,
 187                           char *adapter_name,
 188                           short *adapter_nr,
 189                           int mfe_shared)
 190 {
 191         int result;
 192
 193         mutex_init(&fe->lock);
 194
 195         /* register adapter */
 196         result = dvb_register_adapter(&fe->adapter, adapter_name, module, device, adapter_nr);
 197         if (result < 0) {
 198                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 199                        adapter_name, result);
 200         }
 201         fe->adapter.priv = adapter_priv;
 202         fe->adapter.mfe_shared = mfe_shared;
 203
 204         return result;
 205 }
 206
 207 int videobuf_dvb_register_frontend(struct dvb_adapter *adapter, struct videobuf_dvb *dvb)
 208 {
 209         int result;
 210
 211         /* register frontend */
 212         result = dvb_register_frontend(adapter, dvb->frontend);
 213         if (result < 0) {
 214                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
 215                        dvb->name, result);
 216                 goto fail_frontend;
 217         }
 218
 219         /* register demux stuff */
 220         dvb->demux.dmx.capabilities =
 221                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 222                 DMX_MEMORY_BASED_FILTERING;
 223         dvb->demux.priv       = dvb;
 224         dvb->demux.filternum  = 256;
 225         dvb->demux.feednum    = 256;
 226         dvb->demux.start_feed = videobuf_dvb_start_feed;
 227         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
 228         result = dvb_dmx_init(&dvb->demux);
 229         if (result < 0) {
 230                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
 231                        dvb->name, result);
 232                 goto fail_dmx;
 233         }
 234
 235         dvb->dmxdev.filternum    = 256;
 236         dvb->dmxdev.demux        = &dvb->demux.dmx;
 237         dvb->dmxdev.capabilities = 0;
 238         result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
 239
 240         if (result < 0) {
 241                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
 242                        dvb->name, result);
 243                 goto fail_dmxdev;
 244         }
 245
 246         dvb->fe_hw.source = DMX_FRONTEND_0;
 247         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 248         if (result < 0) {
 249                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 250                        dvb->name, result);
 251                 goto fail_fe_hw;
 252         }
 253
 254         dvb->fe_mem.source = DMX_MEMORY_FE;
 255         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 256         if (result < 0) {
 257                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 258                        dvb->name, result);
 259                 goto fail_fe_mem;
 260         }
 261
 262         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 263         if (result < 0) {
 264                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
 265                        dvb->name, result);
 266                 goto fail_fe_conn;
 267         }
 268
 269         /* register network adapter */
 270         dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
 271         if (dvb->net.dvbdev == NULL) {
 272                 result = -ENOMEM;
 273                 goto fail_fe_conn;
 274         }
 275         return 0;
 276
 277 fail_fe_conn:
 278         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 279 fail_fe_mem:
 280         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 281 fail_fe_hw:
 282         dvb_dmxdev_release(&dvb->dmxdev);
 283 fail_dmxdev:
 284         dvb_dmx_release(&dvb->demux);
 285 fail_dmx:
 286         dvb_unregister_frontend(dvb->frontend);
 287 fail_frontend:
 288         dvb_frontend_detach(dvb->frontend);
 289         dvb->frontend = NULL;
 290
 291         return result;
 292 }
 293
 294 void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
 295 {
 296         struct list_head *list, *q;
 297         struct videobuf_dvb_frontend *fe;
 298
 299         mutex_lock(&f->lock);
 300         list_for_each_safe(list, q, &f->felist) {
 301                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 302                 if(fe->dvb.net.dvbdev) {
 303                         dvb_net_release(&fe->dvb.net);
 304                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_mem);
 305                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_hw);
 306                         dvb_dmxdev_release(&fe->dvb.dmxdev);
 307                         dvb_dmx_release(&fe->dvb.demux);
 308                         dvb_unregister_frontend(fe->dvb.frontend);
 309                 }
 310                 if(fe->dvb.frontend) {  /* always allocated, may have been reset */
 311                         dvb_frontend_detach(fe->dvb.frontend);
 312                         fe->dvb.frontend = NULL;
 313                 }
 314                 list_del(list);
 315                 kfree(fe);
 316         }
 317         mutex_unlock(&f->lock);
 318
 319         dvb_unregister_adapter(&f->adapter);
 320 }
 321
 322 struct videobuf_dvb_frontend * videobuf_dvb_get_frontend(struct videobuf_dvb_frontends *f, int id)
 323 {
 324         struct list_head *list, *q;
 325         struct videobuf_dvb_frontend *fe, *ret = NULL;
 326
 327         mutex_lock(&f->lock);
 328
 329         list_for_each_safe(list, q, &f->felist) {
 330                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 331                 if (fe->id == id) {
 332                         ret = fe;
 333                         break;
 334                 }
 335         }
 336
 337         mutex_unlock(&f->lock);
 338
 339         return ret;
 340 }
 341
 342 int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f, struct dvb_frontend *p)
 343 {
 344         struct list_head *list, *q;
 345         struct videobuf_dvb_frontend *fe = NULL;
 346         int ret = 0;
 347
 348         mutex_lock(&f->lock);
 349
 350         list_for_each_safe(list, q, &f->felist) {
 351                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 352                 if (fe->dvb.frontend == p) {
 353                         ret = fe->id;
 354                         break;
 355                 }
 356         }
 357
 358         mutex_unlock(&f->lock);
 359
 360         return ret;
 361 }
 362
 363 struct videobuf_dvb_frontend * videobuf_dvb_alloc_frontend(void *private, struct videobuf_dvb_frontends *f, int id)
 364 {
 365         struct videobuf_dvb_frontend *fe;
 366
 367         fe = kzalloc(sizeof(struct videobuf_dvb_frontend),GFP_KERNEL);
 368         if (fe == NULL)
 369                 goto fail_alloc;
 370
 371         fe->dev = private;
 372         fe->id = id;
 373         mutex_init(&fe->dvb.lock);
 374
 375         mutex_lock(&f->lock);
 376         list_add_tail(&fe->felist,&f->felist);
 377         mutex_unlock(&f->lock);
 378
 379 fail_alloc:
 380         return fe;
 381 }
 382
 383 EXPORT_SYMBOL(videobuf_dvb_register_bus);
 384 EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
 385 EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
 386 EXPORT_SYMBOL(videobuf_dvb_get_frontend);
 387 EXPORT_SYMBOL(videobuf_dvb_find_frontend);
 388
 389 /* ------------------------------------------------------------------ */
 390 /*
 391  * Local variables:
 392  * c-basic-offset: 8
 393  * compile-command: "make DVB=1"
 394  * End:
 395  */