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