drivers/media/video/video-buf-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 #include <linux/freezer.h>
  24
  25 #include <media/video-buf.h>
  26 #include <media/video-buf-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 = 0;
  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
  49         dprintk("dvb thread started\n");
  50         videobuf_read_start(&dvb->dvbq);
  51
  52         for (;;) {
  53                 /* fetch next buffer */
  54                 buf = list_entry(dvb->dvbq.stream.next,
  55                                  struct videobuf_buffer, stream);
  56                 list_del(&buf->stream);
  57                 err = videobuf_waiton(buf,0,1);
  58                 BUG_ON(0 != err);
  59
  60                 /* no more feeds left or stop_feed() asked us to quit */
  61                 if (0 == dvb->nfeeds)
  62                         break;
  63                 if (kthread_should_stop())
  64                         break;
  65                 try_to_freeze();
  66
  67                 /* feed buffer data to demux */
  68                 if (buf->state == STATE_DONE)
  69                         dvb_dmx_swfilter(&dvb->demux, buf->dma.vmalloc,
  70                                          buf->size);
  71
  72                 /* requeue buffer */
  73                 list_add_tail(&buf->stream,&dvb->dvbq.stream);
  74                 spin_lock_irqsave(dvb->dvbq.irqlock,flags);
  75                 dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
  76                 spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
  77         }
  78
  79         videobuf_read_stop(&dvb->dvbq);
  80         dprintk("dvb thread stopped\n");
  81
  82         /* Hmm, linux becomes *very* unhappy without this ... */
  83         while (!kthread_should_stop()) {
  84                 set_current_state(TASK_INTERRUPTIBLE);
  85                 schedule();
  86         }
  87         return 0;
  88 }
  89
  90 static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
  91 {
  92         struct dvb_demux *demux  = feed->demux;
  93         struct videobuf_dvb *dvb = demux->priv;
  94         int rc;
  95
  96         if (!demux->dmx.frontend)
  97                 return -EINVAL;
  98
  99         mutex_lock(&dvb->lock);
 100         dvb->nfeeds++;
 101         rc = dvb->nfeeds;
 102
 103         if (NULL != dvb->thread)
 104                 goto out;
 105         dvb->thread = kthread_run(videobuf_dvb_thread,
 106                                   dvb, "%s dvb", dvb->name);
 107         if (IS_ERR(dvb->thread)) {
 108                 rc = PTR_ERR(dvb->thread);
 109                 dvb->thread = NULL;
 110         }
 111
 112 out:
 113         mutex_unlock(&dvb->lock);
 114         return rc;
 115 }
 116
 117 static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
 118 {
 119         struct dvb_demux *demux  = feed->demux;
 120         struct videobuf_dvb *dvb = demux->priv;
 121         int err = 0;
 122
 123         mutex_lock(&dvb->lock);
 124         dvb->nfeeds--;
 125         if (0 == dvb->nfeeds  &&  NULL != dvb->thread) {
 126                 // FIXME: cx8802_cancel_buffers(dev);
 127                 err = kthread_stop(dvb->thread);
 128                 dvb->thread = NULL;
 129         }
 130         mutex_unlock(&dvb->lock);
 131         return err;
 132 }
 133
 134 /* ------------------------------------------------------------------ */
 135
 136 int videobuf_dvb_register(struct videobuf_dvb *dvb,
 137                           struct module *module,
 138                           void *adapter_priv,
 139                           struct device *device)
 140 {
 141         int result;
 142
 143         mutex_init(&dvb->lock);
 144
 145         /* register adapter */
 146         result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device);
 147         if (result < 0) {
 148                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 149                        dvb->name, result);
 150                 goto fail_adapter;
 151         }
 152         dvb->adapter.priv = adapter_priv;
 153
 154         /* register frontend */
 155         result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
 156         if (result < 0) {
 157                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
 158                        dvb->name, result);
 159                 goto fail_frontend;
 160         }
 161
 162         /* register demux stuff */
 163         dvb->demux.dmx.capabilities =
 164                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 165                 DMX_MEMORY_BASED_FILTERING;
 166         dvb->demux.priv       = dvb;
 167         dvb->demux.filternum  = 256;
 168         dvb->demux.feednum    = 256;
 169         dvb->demux.start_feed = videobuf_dvb_start_feed;
 170         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
 171         result = dvb_dmx_init(&dvb->demux);
 172         if (result < 0) {
 173                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
 174                        dvb->name, result);
 175                 goto fail_dmx;
 176         }
 177
 178         dvb->dmxdev.filternum    = 256;
 179         dvb->dmxdev.demux        = &dvb->demux.dmx;
 180         dvb->dmxdev.capabilities = 0;
 181         result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
 182         if (result < 0) {
 183                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
 184                        dvb->name, result);
 185                 goto fail_dmxdev;
 186         }
 187
 188         dvb->fe_hw.source = DMX_FRONTEND_0;
 189         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 190         if (result < 0) {
 191                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 192                        dvb->name, result);
 193                 goto fail_fe_hw;
 194         }
 195
 196         dvb->fe_mem.source = DMX_MEMORY_FE;
 197         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 198         if (result < 0) {
 199                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 200                        dvb->name, result);
 201                 goto fail_fe_mem;
 202         }
 203
 204         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 205         if (result < 0) {
 206                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
 207                        dvb->name, result);
 208                 goto fail_fe_conn;
 209         }
 210
 211         /* register network adapter */
 212         dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
 213         return 0;
 214
 215 fail_fe_conn:
 216         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 217 fail_fe_mem:
 218         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 219 fail_fe_hw:
 220         dvb_dmxdev_release(&dvb->dmxdev);
 221 fail_dmxdev:
 222         dvb_dmx_release(&dvb->demux);
 223 fail_dmx:
 224         dvb_unregister_frontend(dvb->frontend);
 225 fail_frontend:
 226         dvb_frontend_detach(dvb->frontend);
 227         dvb_unregister_adapter(&dvb->adapter);
 228 fail_adapter:
 229         return result;
 230 }
 231
 232 void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
 233 {
 234         dvb_net_release(&dvb->net);
 235         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 236         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 237         dvb_dmxdev_release(&dvb->dmxdev);
 238         dvb_dmx_release(&dvb->demux);
 239         dvb_unregister_frontend(dvb->frontend);
 240         dvb_frontend_detach(dvb->frontend);
 241         dvb_unregister_adapter(&dvb->adapter);
 242 }
 243
 244 EXPORT_SYMBOL(videobuf_dvb_register);
 245 EXPORT_SYMBOL(videobuf_dvb_unregister);
 246
 247 /* ------------------------------------------------------------------ */
 248 /*
 249  * Local variables:
 250  * c-basic-offset: 8
 251  * compile-command: "make DVB=1"
 252  * End:
 253  */
 254