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