kernel/drivers/media/v4l2-core/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 #include <linux/slab.h>
  23
  24 #include <linux/freezer.h>
  25
  26 #include <media/videobuf-core.h>
  27 #include <media/videobuf-dvb.h>
  28
  29 /* ------------------------------------------------------------------ */
  30
  31 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
  32 MODULE_LICENSE("GPL");
  33
  34 static unsigned int debug;
  35 module_param(debug, int, 0644);
  36 MODULE_PARM_DESC(debug,"enable debug messages");
  37
  38 #define dprintk(fmt, arg...)    if (debug)                      \
  39         printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg)
  40
  41 /* ------------------------------------------------------------------ */
  42
  43 static int videobuf_dvb_thread(void *data)
  44 {
  45         struct videobuf_dvb *dvb = data;
  46         struct videobuf_buffer *buf;
  47         unsigned long flags;
  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                 videobuf_waiton(&dvb->dvbq, 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_vaddr(&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 {
 144         int result;
 145
 146         mutex_init(&fe->lock);
 147
 148         /* register adapter */
 149         result = dvb_register_adapter(&fe->adapter, adapter_name, module,
 150                 device, adapter_nr);
 151         if (result < 0) {
 152                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 153                        adapter_name, result);
 154         }
 155         fe->adapter.priv = adapter_priv;
 156         fe->adapter.mfe_shared = mfe_shared;
 157
 158         return result;
 159 }
 160
 161 static int videobuf_dvb_register_frontend(struct dvb_adapter *adapter,
 162         struct videobuf_dvb *dvb)
 163 {
 164         int result;
 165
 166         /* register frontend */
 167         result = dvb_register_frontend(adapter, dvb->frontend);
 168         if (result < 0) {
 169                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
 170                        dvb->name, result);
 171                 goto fail_frontend;
 172         }
 173
 174         /* register demux stuff */
 175         dvb->demux.dmx.capabilities =
 176                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 177                 DMX_MEMORY_BASED_FILTERING;
 178         dvb->demux.priv       = dvb;
 179         dvb->demux.filternum  = 256;
 180         dvb->demux.feednum    = 256;
 181         dvb->demux.start_feed = videobuf_dvb_start_feed;
 182         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
 183         result = dvb_dmx_init(&dvb->demux);
 184         if (result < 0) {
 185                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
 186                        dvb->name, result);
 187                 goto fail_dmx;
 188         }
 189
 190         dvb->dmxdev.filternum    = 256;
 191         dvb->dmxdev.demux        = &dvb->demux.dmx;
 192         dvb->dmxdev.capabilities = 0;
 193         result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
 194
 195         if (result < 0) {
 196                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
 197                        dvb->name, result);
 198                 goto fail_dmxdev;
 199         }
 200
 201         dvb->fe_hw.source = DMX_FRONTEND_0;
 202         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 203         if (result < 0) {
 204                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 205                        dvb->name, result);
 206                 goto fail_fe_hw;
 207         }
 208
 209         dvb->fe_mem.source = DMX_MEMORY_FE;
 210         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 211         if (result < 0) {
 212                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 213                        dvb->name, result);
 214                 goto fail_fe_mem;
 215         }
 216
 217         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 218         if (result < 0) {
 219                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
 220                        dvb->name, result);
 221                 goto fail_fe_conn;
 222         }
 223
 224         /* register network adapter */
 225         result = dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
 226         if (result < 0) {
 227                 printk(KERN_WARNING "%s: dvb_net_init failed (errno = %d)\n",
 228                        dvb->name, result);
 229                 goto fail_fe_conn;
 230         }
 231         return 0;
 232
 233 fail_fe_conn:
 234         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 235 fail_fe_mem:
 236         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 237 fail_fe_hw:
 238         dvb_dmxdev_release(&dvb->dmxdev);
 239 fail_dmxdev:
 240         dvb_dmx_release(&dvb->demux);
 241 fail_dmx:
 242         dvb_unregister_frontend(dvb->frontend);
 243 fail_frontend:
 244         dvb_frontend_detach(dvb->frontend);
 245         dvb->frontend = NULL;
 246
 247         return result;
 248 }
 249
 250 /* ------------------------------------------------------------------ */
 251 /* Register a single adapter and one or more frontends */
 252 int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
 253                           struct module *module,
 254                           void *adapter_priv,
 255                           struct device *device,
 256                           short *adapter_nr,
 257                           int mfe_shared)
 258 {
 259         struct list_head *list, *q;
 260         struct videobuf_dvb_frontend *fe;
 261         int res;
 262
 263         fe = videobuf_dvb_get_frontend(f, 1);
 264         if (!fe) {
 265                 printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
 266                 return -EINVAL;
 267         }
 268
 269         /* Bring up the adapter */
 270         res = videobuf_dvb_register_adapter(f, module, adapter_priv, device,
 271                 fe->dvb.name, adapter_nr, mfe_shared);
 272         if (res < 0) {
 273                 printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
 274                 return res;
 275         }
 276
 277         /* Attach all of the frontends to the adapter */
 278         mutex_lock(&f->lock);
 279         list_for_each_safe(list, q, &f->felist) {
 280                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 281                 res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb);
 282                 if (res < 0) {
 283                         printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
 284                                 fe->dvb.name, res);
 285                         goto err;
 286                 }
 287         }
 288         mutex_unlock(&f->lock);
 289         return 0;
 290
 291 err:
 292         mutex_unlock(&f->lock);
 293         videobuf_dvb_unregister_bus(f);
 294         return res;
 295 }
 296 EXPORT_SYMBOL(videobuf_dvb_register_bus);
 297
 298 void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
 299 {
 300         videobuf_dvb_dealloc_frontends(f);
 301
 302         dvb_unregister_adapter(&f->adapter);
 303 }
 304 EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
 305
 306 struct videobuf_dvb_frontend *videobuf_dvb_get_frontend(
 307         struct videobuf_dvb_frontends *f, int id)
 308 {
 309         struct list_head *list, *q;
 310         struct videobuf_dvb_frontend *fe, *ret = NULL;
 311
 312         mutex_lock(&f->lock);
 313
 314         list_for_each_safe(list, q, &f->felist) {
 315                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 316                 if (fe->id == id) {
 317                         ret = fe;
 318                         break;
 319                 }
 320         }
 321
 322         mutex_unlock(&f->lock);
 323
 324         return ret;
 325 }
 326 EXPORT_SYMBOL(videobuf_dvb_get_frontend);
 327
 328 int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f,
 329         struct dvb_frontend *p)
 330 {
 331         struct list_head *list, *q;
 332         struct videobuf_dvb_frontend *fe = NULL;
 333         int ret = 0;
 334
 335         mutex_lock(&f->lock);
 336
 337         list_for_each_safe(list, q, &f->felist) {
 338                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 339                 if (fe->dvb.frontend == p) {
 340                         ret = fe->id;
 341                         break;
 342                 }
 343         }
 344
 345         mutex_unlock(&f->lock);
 346
 347         return ret;
 348 }
 349 EXPORT_SYMBOL(videobuf_dvb_find_frontend);
 350
 351 struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend(
 352         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->id = id;
 361         mutex_init(&fe->dvb.lock);
 362
 363         mutex_lock(&f->lock);
 364         list_add_tail(&fe->felist, &f->felist);
 365         mutex_unlock(&f->lock);
 366
 367 fail_alloc:
 368         return fe;
 369 }
 370 EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
 371
 372 void videobuf_dvb_dealloc_frontends(struct videobuf_dvb_frontends *f)
 373 {
 374         struct list_head *list, *q;
 375         struct videobuf_dvb_frontend *fe;
 376
 377         mutex_lock(&f->lock);
 378         list_for_each_safe(list, q, &f->felist) {
 379                 fe = list_entry(list, struct videobuf_dvb_frontend, felist);
 380                 if (fe->dvb.net.dvbdev) {
 381                         dvb_net_release(&fe->dvb.net);
 382                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
 383                                 &fe->dvb.fe_mem);
 384                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
 385                                 &fe->dvb.fe_hw);
 386                         dvb_dmxdev_release(&fe->dvb.dmxdev);
 387                         dvb_dmx_release(&fe->dvb.demux);
 388                         dvb_unregister_frontend(fe->dvb.frontend);
 389                 }
 390                 if (fe->dvb.frontend)
 391                         /* always allocated, may have been reset */
 392                         dvb_frontend_detach(fe->dvb.frontend);
 393                 list_del(list); /* remove list entry */
 394                 kfree(fe);      /* free frontend allocation */
 395         }
 396         mutex_unlock(&f->lock);
 397 }
 398 EXPORT_SYMBOL(videobuf_dvb_dealloc_frontends);