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
 139 int videobuf_dvb_register(struct videobuf_dvb *dvb,
 140                           struct module *module,
 141                           void *adapter_priv,
 142                           struct device *device,
 143                           short *adapter_nr)
 144 {
 145         int result;
 146
 147         mutex_init(&dvb->lock);
 148
 149         /* register adapter */
 150         result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device,
 151                                       adapter_nr);
 152         if (result < 0) {
 153                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 154                        dvb->name, result);
 155                 goto fail_adapter;
 156         }
 157         dvb->adapter.priv = adapter_priv;
 158
 159         /* register frontend */
 160         result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
 161         if (result < 0) {
 162                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
 163                        dvb->name, result);
 164                 goto fail_frontend;
 165         }
 166
 167         /* register demux stuff */
 168         dvb->demux.dmx.capabilities =
 169                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 170                 DMX_MEMORY_BASED_FILTERING;
 171         dvb->demux.priv       = dvb;
 172         dvb->demux.filternum  = 256;
 173         dvb->demux.feednum    = 256;
 174         dvb->demux.start_feed = videobuf_dvb_start_feed;
 175         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
 176         result = dvb_dmx_init(&dvb->demux);
 177         if (result < 0) {
 178                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
 179                        dvb->name, result);
 180                 goto fail_dmx;
 181         }
 182
 183         dvb->dmxdev.filternum    = 256;
 184         dvb->dmxdev.demux        = &dvb->demux.dmx;
 185         dvb->dmxdev.capabilities = 0;
 186         result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
 187         if (result < 0) {
 188                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
 189                        dvb->name, result);
 190                 goto fail_dmxdev;
 191         }
 192
 193         dvb->fe_hw.source = DMX_FRONTEND_0;
 194         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 195         if (result < 0) {
 196                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 197                        dvb->name, result);
 198                 goto fail_fe_hw;
 199         }
 200
 201         dvb->fe_mem.source = DMX_MEMORY_FE;
 202         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 203         if (result < 0) {
 204                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 205                        dvb->name, result);
 206                 goto fail_fe_mem;
 207         }
 208
 209         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 210         if (result < 0) {
 211                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
 212                        dvb->name, result);
 213                 goto fail_fe_conn;
 214         }
 215
 216         /* register network adapter */
 217         dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
 218         return 0;
 219
 220 fail_fe_conn:
 221         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 222 fail_fe_mem:
 223         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 224 fail_fe_hw:
 225         dvb_dmxdev_release(&dvb->dmxdev);
 226 fail_dmxdev:
 227         dvb_dmx_release(&dvb->demux);
 228 fail_dmx:
 229         dvb_unregister_frontend(dvb->frontend);
 230 fail_frontend:
 231         dvb_frontend_detach(dvb->frontend);
 232         dvb_unregister_adapter(&dvb->adapter);
 233 fail_adapter:
 234         return result;
 235 }
 236
 237 void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
 238 {
 239         dvb_net_release(&dvb->net);
 240         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 241         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 242         dvb_dmxdev_release(&dvb->dmxdev);
 243         dvb_dmx_release(&dvb->demux);
 244         dvb_unregister_frontend(dvb->frontend);
 245         dvb_frontend_detach(dvb->frontend);
 246         dvb_unregister_adapter(&dvb->adapter);
 247 }
 248
 249 EXPORT_SYMBOL(videobuf_dvb_register);
 250 EXPORT_SYMBOL(videobuf_dvb_unregister);
 251
 252 /* ------------------------------------------------------------------ */
 253 /*
 254  * Local variables:
 255  * c-basic-offset: 8
 256  * compile-command: "make DVB=1"
 257  * End:
 258  */