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
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/device.h>
  20 #include <linux/fs.h>
  21 #include <linux/kthread.h>
  22 #include <linux/file.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(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_vmalloc (&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                 // FIXME: cx8802_cancel_buffers(dev);
 131                 err = kthread_stop(dvb->thread);
 132                 dvb->thread = NULL;
 133         }
 134         mutex_unlock(&dvb->lock);
 135         return err;
 136 }
 137
 138 /* ------------------------------------------------------------------ */
 139
 140 int videobuf_dvb_register(struct videobuf_dvb *dvb,
 141                           struct module *module,
 142                           void *adapter_priv,
 143                           struct device *device,
 144                           short *adapter_nr)
 145 {
 146         int result;
 147
 148         mutex_init(&dvb->lock);
 149
 150         /* register adapter */
 151         result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device,
 152                                       adapter_nr);
 153         if (result < 0) {
 154                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 155                        dvb->name, result);
 156                 goto fail_adapter;
 157         }
 158         dvb->adapter.priv = adapter_priv;
 159
 160         /* register frontend */
 161         result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
 162         if (result < 0) {
 163                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
 164                        dvb->name, result);
 165                 goto fail_frontend;
 166         }
 167
 168         /* register demux stuff */
 169         dvb->demux.dmx.capabilities =
 170                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 171                 DMX_MEMORY_BASED_FILTERING;
 172         dvb->demux.priv       = dvb;
 173         dvb->demux.filternum  = 256;
 174         dvb->demux.feednum    = 256;
 175         dvb->demux.start_feed = videobuf_dvb_start_feed;
 176         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
 177         result = dvb_dmx_init(&dvb->demux);
 178         if (result < 0) {
 179                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
 180                        dvb->name, result);
 181                 goto fail_dmx;
 182         }
 183
 184         dvb->dmxdev.filternum    = 256;
 185         dvb->dmxdev.demux        = &dvb->demux.dmx;
 186         dvb->dmxdev.capabilities = 0;
 187         result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
 188         if (result < 0) {
 189                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
 190                        dvb->name, result);
 191                 goto fail_dmxdev;
 192         }
 193
 194         dvb->fe_hw.source = DMX_FRONTEND_0;
 195         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 196         if (result < 0) {
 197                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 198                        dvb->name, result);
 199                 goto fail_fe_hw;
 200         }
 201
 202         dvb->fe_mem.source = DMX_MEMORY_FE;
 203         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 204         if (result < 0) {
 205                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 206                        dvb->name, result);
 207                 goto fail_fe_mem;
 208         }
 209
 210         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 211         if (result < 0) {
 212                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
 213                        dvb->name, result);
 214                 goto fail_fe_conn;
 215         }
 216
 217         /* register network adapter */
 218         dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
 219         return 0;
 220
 221 fail_fe_conn:
 222         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 223 fail_fe_mem:
 224         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 225 fail_fe_hw:
 226         dvb_dmxdev_release(&dvb->dmxdev);
 227 fail_dmxdev:
 228         dvb_dmx_release(&dvb->demux);
 229 fail_dmx:
 230         dvb_unregister_frontend(dvb->frontend);
 231 fail_frontend:
 232         dvb_frontend_detach(dvb->frontend);
 233         dvb_unregister_adapter(&dvb->adapter);
 234 fail_adapter:
 235         return result;
 236 }
 237
 238 void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
 239 {
 240         dvb_net_release(&dvb->net);
 241         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 242         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 243         dvb_dmxdev_release(&dvb->dmxdev);
 244         dvb_dmx_release(&dvb->demux);
 245         dvb_unregister_frontend(dvb->frontend);
 246         dvb_frontend_detach(dvb->frontend);
 247         dvb_unregister_adapter(&dvb->adapter);
 248 }
 249
 250 EXPORT_SYMBOL(videobuf_dvb_register);
 251 EXPORT_SYMBOL(videobuf_dvb_unregister);
 252
 253 /* ------------------------------------------------------------------ */
 254 /*
 255  * Local variables:
 256  * c-basic-offset: 8
 257  * compile-command: "make DVB=1"
 258  * End:
 259  */
 260