LXR linux/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
  30MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
  31MODULE_LICENSE("GPL");
  32
  33static unsigned int debug = 0;
  34module_param(debug, int, 0644);
  35MODULE_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
  42static 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 == STATE_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
  92static 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
 114out:
 115        mutex_unlock(&dvb->lock);
 116        return rc;
 117}
 118
 119static 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
 138int 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
 217fail_fe_conn:
 218        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 219fail_fe_mem:
 220        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 221fail_fe_hw:
 222        dvb_dmxdev_release(&dvb->dmxdev);
 223fail_dmxdev:
 224        dvb_dmx_release(&dvb->demux);
 225fail_dmx:
 226        dvb_unregister_frontend(dvb->frontend);
 227fail_frontend:
 228        dvb_frontend_detach(dvb->frontend);
 229        dvb_unregister_adapter(&dvb->adapter);
 230fail_adapter:
 231        return result;
 232}
 233
 234void 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
 246EXPORT_SYMBOL(videobuf_dvb_register);
 247EXPORT_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
 257