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 #include <linux/freezer.h>
  24
  25 #include <media/videobuf-dma-sg.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 = 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         struct videobuf_dmabuf *dma;
  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                 dma=videobuf_to_dma(buf);
  70                 if (buf->state == VIDEOBUF_DONE)
  71                         dvb_dmx_swfilter(&dvb->demux, dma->vmalloc,
  72                                          buf->size);
  73
  74                 /* requeue buffer */
  75                 list_add_tail(&buf->stream,&dvb->dvbq.stream);
  76                 spin_lock_irqsave(dvb->dvbq.irqlock,flags);
  77                 dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
  78                 spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
  79         }
  80
  81         videobuf_read_stop(&dvb->dvbq);
  82         dprintk("dvb thread stopped\n");
  83
  84         /* Hmm, linux becomes *very* unhappy without this ... */
  85         while (!kthread_should_stop()) {
  86                 set_current_state(TASK_INTERRUPTIBLE);
  87                 schedule();
  88         }
  89         return 0;
  90 }
  91
  92 static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
  93 {
  94         struct dvb_demux *demux  = feed->demux;
  95         struct videobuf_dvb *dvb = demux->priv;
  96         int rc;
  97
  98         if (!demux->dmx.frontend)
  99                 return -EINVAL;
 100
 101         mutex_lock(&dvb->lock);
 102         dvb->nfeeds++;
 103         rc = dvb->nfeeds;
 104
 105         if (NULL != dvb->thread)
 106                 goto out;
 107         dvb->thread = kthread_run(videobuf_dvb_thread,
 108                                   dvb, "%s dvb", dvb->name);
 109         if (IS_ERR(dvb->thread)) {
 110                 rc = PTR_ERR(dvb->thread);
 111                 dvb->thread = NULL;
 112         }
 113
 114 out:
 115         mutex_unlock(&dvb->lock);
 116         return rc;
 117 }
 118
 119 static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
 120 {
 121         struct dvb_demux *demux  = feed->demux;
 122         struct videobuf_dvb *dvb = demux->priv;
 123         int err = 0;
 124
 125         mutex_lock(&dvb->lock);
 126         dvb->nfeeds--;
 127         if (0 == dvb->nfeeds  &&  NULL != dvb->thread) {
 128                 // FIXME: cx8802_cancel_buffers(dev);
 129                 err = kthread_stop(dvb->thread);
 130                 dvb->thread = NULL;
 131         }
 132         mutex_unlock(&dvb->lock);
 133         return err;
 134 }
 135
 136 /* ------------------------------------------------------------------ */
 137
 138 int videobuf_dvb_register(struct videobuf_dvb *dvb,
 139                           struct module *module,
 140                           void *adapter_priv,
 141                           struct device *device)
 142 {
 143         int result;
 144
 145         mutex_init(&dvb->lock);
 146
 147         /* register adapter */
 148         result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device);
 149         if (result < 0) {
 150                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 151                        dvb->name, result);
 152                 goto fail_adapter;
 153         }
 154         dvb->adapter.priv = adapter_priv;
 155
 156         /* register frontend */
 157         result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
 158         if (result < 0) {
 159                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
 160                        dvb->name, result);
 161                 goto fail_frontend;
 162         }
 163
 164         /* register demux stuff */
 165         dvb->demux.dmx.capabilities =
 166                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 167                 DMX_MEMORY_BASED_FILTERING;
 168         dvb->demux.priv       = dvb;
 169         dvb->demux.filternum  = 256;
 170         dvb->demux.feednum    = 256;
 171         dvb->demux.start_feed = videobuf_dvb_start_feed;
 172         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
 173         result = dvb_dmx_init(&dvb->demux);
 174         if (result < 0) {
 175                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
 176                        dvb->name, result);
 177                 goto fail_dmx;
 178         }
 179
 180         dvb->dmxdev.filternum    = 256;
 181         dvb->dmxdev.demux        = &dvb->demux.dmx;
 182         dvb->dmxdev.capabilities = 0;
 183         result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
 184         if (result < 0) {
 185                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
 186                        dvb->name, result);
 187                 goto fail_dmxdev;
 188         }
 189
 190         dvb->fe_hw.source = DMX_FRONTEND_0;
 191         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 192         if (result < 0) {
 193                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 194                        dvb->name, result);
 195                 goto fail_fe_hw;
 196         }
 197
 198         dvb->fe_mem.source = DMX_MEMORY_FE;
 199         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 200         if (result < 0) {
 201                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 202                        dvb->name, result);
 203                 goto fail_fe_mem;
 204         }
 205
 206         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 207         if (result < 0) {
 208                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
 209                        dvb->name, result);
 210                 goto fail_fe_conn;
 211         }
 212
 213         /* register network adapter */
 214         dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
 215         return 0;
 216
 217 fail_fe_conn:
 218         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 219 fail_fe_mem:
 220         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 221 fail_fe_hw:
 222         dvb_dmxdev_release(&dvb->dmxdev);
 223 fail_dmxdev:
 224         dvb_dmx_release(&dvb->demux);
 225 fail_dmx:
 226         dvb_unregister_frontend(dvb->frontend);
 227 fail_frontend:
 228         dvb_frontend_detach(dvb->frontend);
 229         dvb_unregister_adapter(&dvb->adapter);
 230 fail_adapter:
 231         return result;
 232 }
 233
 234 void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
 235 {
 236         dvb_net_release(&dvb->net);
 237         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 238         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 239         dvb_dmxdev_release(&dvb->dmxdev);
 240         dvb_dmx_release(&dvb->demux);
 241         dvb_unregister_frontend(dvb->frontend);
 242         dvb_frontend_detach(dvb->frontend);
 243         dvb_unregister_adapter(&dvb->adapter);
 244 }
 245
 246 EXPORT_SYMBOL(videobuf_dvb_register);
 247 EXPORT_SYMBOL(videobuf_dvb_unregister);
 248
 249 /* ------------------------------------------------------------------ */
 250 /*
 251  * Local variables:
 252  * c-basic-offset: 8
 253  * compile-command: "make DVB=1"
 254  * End:
 255  */
 256