SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 = -EINVAL;
 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                 goto err;
 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                 goto err;
 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                 }
 172         }
 173         mutex_unlock(&f->lock);
 174
 175 err:
 176         return res;
 177 }
 178
 179 int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe,
 180                           struct module *module,
 181                           void *adapter_priv,
 182                           struct device *device,
 183                           char *adapter_name,
 184                           short *adapter_nr,
 185                           int mfe_shared)
 186 {
 187         int result;
 188
 189         mutex_init(&fe->lock);
 190
 191         /* register adapter */
 192         result = dvb_register_adapter(&fe->adapter, adapter_name, module, device, adapter_nr);
 193         if (result < 0) {
 194                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 195                        adapter_name, result);
 196         }
 197         fe->adapter.priv = adapter_priv;
 198         fe->adapter.mfe_shared = mfe_shared;
 199
 200         return result;
 201 }
 202
 203 int videobuf_dvb_register_frontend(struct dvb_adapter *adapter, struct videobuf_dvb *dvb)
 204 {
 205         int result;
 206
 207         /* register frontend */
 208         result = dvb_register_frontend(adapter, dvb->frontend);
 209         if (result < 0) {
 210                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
 211                        dvb->name, result);
 212                 goto fail_frontend;
 213         }
 214
 215         /* register demux stuff */
 216         dvb->demux.dmx.capabilities =
 217                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 218                 DMX_MEMORY_BASED_FILTERING;
 219         dvb->demux.priv       = dvb;
 220         dvb->demux.filternum  = 256;
 221         dvb->demux.feednum    = 256;
 222         dvb->demux.start_feed = videobuf_dvb_start_feed;
 223         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
 224         result = dvb_dmx_init(&dvb->demux);
 225         if (result < 0) {
 226                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
 227                        dvb->name, result);
 228                 goto fail_dmx;
 229         }
 230
 231         dvb->dmxdev.filternum    = 256;
 232         dvb->dmxdev.demux        = &dvb->demux.dmx;
 233         dvb->dmxdev.capabilities = 0;
 234         result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
 235
 236         if (result < 0) {
 237                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
 238                        dvb->name, result);
 239                 goto fail_dmxdev;
 240         }
 241
 242         dvb->fe_hw.source = DMX_FRONTEND_0;
 243         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 244         if (result < 0) {
 245                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 246                        dvb->name, result);
 247                 goto fail_fe_hw;
 248         }
 249
 250         dvb->fe_mem.source = DMX_MEMORY_FE;
 251         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 252         if (result < 0) {
 253                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 254                        dvb->name, result);
 255                 goto fail_fe_mem;
 256         }
 257
 258         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 259         if (result < 0) {
 260                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
 261                        dvb->name, result);
 262                 goto fail_fe_conn;
 263         }
 264
 265         /* register network adapter */
 266         dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
 267         return 0;
 268
 269 fail_fe_conn:
 270         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 271 fail_fe_mem:
 272         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 273 fail_fe_hw:
 274         dvb_dmxdev_release(&dvb->dmxdev);
 275 fail_dmxdev:
 276         dvb_dmx_release(&dvb->demux);
 277 fail_dmx:
 278         dvb_unregister_frontend(dvb->frontend);
 279 fail_frontend:
 280         dvb_frontend_detach(dvb->frontend);
 281         dvb_unregister_adapter(adapter);
 282
 283         return result;
 284 }
 285
 286 void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
 287 {
 288         struct list_head *list, *q;
 289         struct videobuf_dvb_frontend *fe;
 290
 291         mutex_lock(&f->lock);
 292         list_for_each_safe(list, q, &f->felist) {
 293                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 294
 295                 dvb_net_release(&fe->dvb.net);
 296                 fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_mem);
 297                 fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_hw);
 298                 dvb_dmxdev_release(&fe->dvb.dmxdev);
 299                 dvb_dmx_release(&fe->dvb.demux);
 300                 dvb_unregister_frontend(fe->dvb.frontend);
 301                 dvb_frontend_detach(fe->dvb.frontend);
 302
 303                 list_del(list);
 304                 kfree(fe);
 305         }
 306         mutex_unlock(&f->lock);
 307
 308         dvb_unregister_adapter(&f->adapter);
 309 }
 310
 311 struct videobuf_dvb_frontend * videobuf_dvb_get_frontend(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
 331 int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f, struct dvb_frontend *p)
 332 {
 333         struct list_head *list, *q;
 334         struct videobuf_dvb_frontend *fe = NULL;
 335         int ret = 0;
 336
 337         mutex_lock(&f->lock);
 338
 339         list_for_each_safe(list, q, &f->felist) {
 340                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 341                 if (fe->dvb.frontend == p) {
 342                         ret = fe->id;
 343                         break;
 344                 }
 345         }
 346
 347         mutex_unlock(&f->lock);
 348
 349         return ret;
 350 }
 351
 352 struct videobuf_dvb_frontend * videobuf_dvb_alloc_frontend(void *private, struct videobuf_dvb_frontends *f, int id)
 353 {
 354         struct videobuf_dvb_frontend *fe;
 355
 356         fe = kzalloc(sizeof(struct videobuf_dvb_frontend),GFP_KERNEL);
 357         if (fe == NULL)
 358                 goto fail_alloc;
 359
 360         fe->dev = private;
 361         fe->id = id;
 362         mutex_init(&fe->dvb.lock);
 363
 364         mutex_lock(&f->lock);
 365         list_add_tail(&fe->felist,&f->felist);
 366         mutex_unlock(&f->lock);
 367
 368 fail_alloc:
 369         return fe;
 370 }
 371
 372 EXPORT_SYMBOL(videobuf_dvb_register_bus);
 373 EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
 374 EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
 375 EXPORT_SYMBOL(videobuf_dvb_get_frontend);
 376 EXPORT_SYMBOL(videobuf_dvb_find_frontend);
 377
 378 /* ------------------------------------------------------------------ */
 379 /*
 380  * Local variables:
 381  * c-basic-offset: 8
 382  * compile-command: "make DVB=1"
 383  * End:
 384  */