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 #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/suspend.h>
  23
  24 #include <media/video-buf.h>
  25 #include <media/video-buf-dvb.h>
  26
  27 /* ------------------------------------------------------------------ */
  28
  29 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
  30 MODULE_LICENSE("GPL");
  31
  32 static unsigned int debug = 0;
  33 module_param(debug, int, 0644);
  34 MODULE_PARM_DESC(debug,"enable debug messages");
  35
  36 #define dprintk(fmt, arg...)    if (debug)                      \
  37         printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg)
  38
  39 /* ------------------------------------------------------------------ */
  40
  41 static int videobuf_dvb_thread(void *data)
  42 {
  43         struct videobuf_dvb *dvb = data;
  44         struct videobuf_buffer *buf;
  45         unsigned long flags;
  46         int err;
  47
  48         dprintk("dvb thread started\n");
  49         videobuf_read_start(&dvb->dvbq);
  50
  51         for (;;) {
  52                 /* fetch next buffer */
  53                 buf = list_entry(dvb->dvbq.stream.next,
  54                                  struct videobuf_buffer, stream);
  55                 list_del(&buf->stream);
  56                 err = videobuf_waiton(buf,0,1);
  57                 BUG_ON(0 != err);
  58
  59                 /* no more feeds left or stop_feed() asked us to quit */
  60                 if (0 == dvb->nfeeds)
  61                         break;
  62                 if (kthread_should_stop())
  63                         break;
  64                 try_to_freeze();
  65
  66                 /* feed buffer data to demux */
  67                 if (buf->state == STATE_DONE)
  68                         dvb_dmx_swfilter(&dvb->demux, buf->dma.vmalloc,
  69                                          buf->size);
  70
  71                 /* requeue buffer */
  72                 list_add_tail(&buf->stream,&dvb->dvbq.stream);
  73                 spin_lock_irqsave(dvb->dvbq.irqlock,flags);
  74                 dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
  75                 spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
  76         }
  77
  78         videobuf_read_stop(&dvb->dvbq);
  79         dprintk("dvb thread stopped\n");
  80
  81         /* Hmm, linux becomes *very* unhappy without this ... */
  82         while (!kthread_should_stop()) {
  83                 set_current_state(TASK_INTERRUPTIBLE);
  84                 schedule();
  85         }
  86         return 0;
  87 }
  88
  89 static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
  90 {
  91         struct dvb_demux *demux  = feed->demux;
  92         struct videobuf_dvb *dvb = demux->priv;
  93         int rc;
  94
  95         if (!demux->dmx.frontend)
  96                 return -EINVAL;
  97
  98         down(&dvb->lock);
  99         dvb->nfeeds++;
 100         rc = dvb->nfeeds;
 101
 102         if (NULL != dvb->thread)
 103                 goto out;
 104         dvb->thread = kthread_run(videobuf_dvb_thread,
 105                                   dvb, "%s dvb", dvb->name);
 106         if (IS_ERR(dvb->thread)) {
 107                 rc = PTR_ERR(dvb->thread);
 108                 dvb->thread = NULL;
 109         }
 110
 111 out:
 112         up(&dvb->lock);
 113         return rc;
 114 }
 115
 116 static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
 117 {
 118         struct dvb_demux *demux  = feed->demux;
 119         struct videobuf_dvb *dvb = demux->priv;
 120         int err = 0;
 121
 122         down(&dvb->lock);
 123         dvb->nfeeds--;
 124         if (0 == dvb->nfeeds  &&  NULL != dvb->thread) {
 125                 // FIXME: cx8802_cancel_buffers(dev);
 126                 err = kthread_stop(dvb->thread);
 127                 dvb->thread = NULL;
 128         }
 129         up(&dvb->lock);
 130         return err;
 131 }
 132
 133 /* ------------------------------------------------------------------ */
 134
 135 int videobuf_dvb_register(struct videobuf_dvb *dvb,
 136                           struct module *module,
 137                           void *adapter_priv)
 138 {
 139         int result;
 140
 141         init_MUTEX(&dvb->lock);
 142
 143         /* register adapter */
 144         result = dvb_register_adapter(&dvb->adapter, dvb->name, module);
 145         if (result < 0) {
 146                 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 147                        dvb->name, result);
 148                 goto fail_adapter;
 149         }
 150         dvb->adapter.priv = adapter_priv;
 151
 152         /* register frontend */
 153         result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
 154         if (result < 0) {
 155                 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
 156                        dvb->name, result);
 157                 goto fail_frontend;
 158         }
 159
 160         /* register demux stuff */
 161         dvb->demux.dmx.capabilities =
 162                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 163                 DMX_MEMORY_BASED_FILTERING;
 164         dvb->demux.priv       = dvb;
 165         dvb->demux.filternum  = 256;
 166         dvb->demux.feednum    = 256;
 167         dvb->demux.start_feed = videobuf_dvb_start_feed;
 168         dvb->demux.stop_feed  = videobuf_dvb_stop_feed;
 169         result = dvb_dmx_init(&dvb->demux);
 170         if (result < 0) {
 171                 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
 172                        dvb->name, result);
 173                 goto fail_dmx;
 174         }
 175
 176         dvb->dmxdev.filternum    = 256;
 177         dvb->dmxdev.demux        = &dvb->demux.dmx;
 178         dvb->dmxdev.capabilities = 0;
 179         result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
 180         if (result < 0) {
 181                 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
 182                        dvb->name, result);
 183                 goto fail_dmxdev;
 184         }
 185
 186         dvb->fe_hw.source = DMX_FRONTEND_0;
 187         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 188         if (result < 0) {
 189                 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 190                        dvb->name, result);
 191                 goto fail_fe_hw;
 192         }
 193
 194         dvb->fe_mem.source = DMX_MEMORY_FE;
 195         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 196         if (result < 0) {
 197                 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 198                        dvb->name, result);
 199                 goto fail_fe_mem;
 200         }
 201
 202         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 203         if (result < 0) {
 204                 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
 205                        dvb->name, result);
 206                 goto fail_fe_conn;
 207         }
 208
 209         /* register network adapter */
 210         dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
 211         return 0;
 212
 213 fail_fe_conn:
 214         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 215 fail_fe_mem:
 216         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 217 fail_fe_hw:
 218         dvb_dmxdev_release(&dvb->dmxdev);
 219 fail_dmxdev:
 220         dvb_dmx_release(&dvb->demux);
 221 fail_dmx:
 222         dvb_unregister_frontend(dvb->frontend);
 223 fail_frontend:
 224         dvb_unregister_adapter(&dvb->adapter);
 225 fail_adapter:
 226         return result;
 227 }
 228
 229 void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
 230 {
 231         dvb_net_release(&dvb->net);
 232         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 233         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 234         dvb_dmxdev_release(&dvb->dmxdev);
 235         dvb_dmx_release(&dvb->demux);
 236         dvb_unregister_frontend(dvb->frontend);
 237         dvb_unregister_adapter(&dvb->adapter);
 238 }
 239
 240 EXPORT_SYMBOL(videobuf_dvb_register);
 241 EXPORT_SYMBOL(videobuf_dvb_unregister);
 242
 243 /* ------------------------------------------------------------------ */
 244 /*
 245  * Local variables:
 246  * c-basic-offset: 8
 247  * compile-command: "make DVB=1"
 248  * End:
 249  */