399 lines
10 KiB
C
399 lines
10 KiB
C
/*
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*
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* some helper function for simple DVB cards which simply DMA the
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* complete transport stream and let the computer sort everything else
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* (i.e. we are using the software demux, ...). Also uses the
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* video-buf to manage DMA buffers.
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*
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* (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/kthread.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/freezer.h>
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#include <media/videobuf-core.h>
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#include <media/videobuf-dvb.h>
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/* ------------------------------------------------------------------ */
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MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
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MODULE_LICENSE("GPL");
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static unsigned int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug,"enable debug messages");
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#define dprintk(fmt, arg...) if (debug) \
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printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg)
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/* ------------------------------------------------------------------ */
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static int videobuf_dvb_thread(void *data)
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{
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struct videobuf_dvb *dvb = data;
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struct videobuf_buffer *buf;
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unsigned long flags;
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void *outp;
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dprintk("dvb thread started\n");
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set_freezable();
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videobuf_read_start(&dvb->dvbq);
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for (;;) {
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/* fetch next buffer */
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buf = list_entry(dvb->dvbq.stream.next,
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struct videobuf_buffer, stream);
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list_del(&buf->stream);
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videobuf_waiton(&dvb->dvbq, buf, 0, 1);
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/* no more feeds left or stop_feed() asked us to quit */
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if (0 == dvb->nfeeds)
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break;
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if (kthread_should_stop())
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break;
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try_to_freeze();
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/* feed buffer data to demux */
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outp = videobuf_queue_to_vaddr(&dvb->dvbq, buf);
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if (buf->state == VIDEOBUF_DONE)
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dvb_dmx_swfilter(&dvb->demux, outp,
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buf->size);
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/* requeue buffer */
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list_add_tail(&buf->stream,&dvb->dvbq.stream);
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spin_lock_irqsave(dvb->dvbq.irqlock,flags);
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dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
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spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
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}
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videobuf_read_stop(&dvb->dvbq);
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dprintk("dvb thread stopped\n");
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/* Hmm, linux becomes *very* unhappy without this ... */
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while (!kthread_should_stop()) {
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set_current_state(TASK_INTERRUPTIBLE);
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schedule();
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}
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return 0;
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}
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static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
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{
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struct dvb_demux *demux = feed->demux;
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struct videobuf_dvb *dvb = demux->priv;
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int rc;
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if (!demux->dmx.frontend)
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return -EINVAL;
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mutex_lock(&dvb->lock);
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dvb->nfeeds++;
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rc = dvb->nfeeds;
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if (NULL != dvb->thread)
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goto out;
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dvb->thread = kthread_run(videobuf_dvb_thread,
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dvb, "%s dvb", dvb->name);
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if (IS_ERR(dvb->thread)) {
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rc = PTR_ERR(dvb->thread);
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dvb->thread = NULL;
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}
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out:
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mutex_unlock(&dvb->lock);
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return rc;
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}
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static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
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{
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struct dvb_demux *demux = feed->demux;
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struct videobuf_dvb *dvb = demux->priv;
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int err = 0;
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mutex_lock(&dvb->lock);
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dvb->nfeeds--;
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if (0 == dvb->nfeeds && NULL != dvb->thread) {
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err = kthread_stop(dvb->thread);
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dvb->thread = NULL;
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}
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mutex_unlock(&dvb->lock);
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return err;
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}
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static int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe,
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struct module *module,
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void *adapter_priv,
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struct device *device,
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char *adapter_name,
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short *adapter_nr,
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int mfe_shared)
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{
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int result;
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mutex_init(&fe->lock);
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/* register adapter */
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result = dvb_register_adapter(&fe->adapter, adapter_name, module,
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device, adapter_nr);
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if (result < 0) {
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printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
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adapter_name, result);
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}
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fe->adapter.priv = adapter_priv;
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fe->adapter.mfe_shared = mfe_shared;
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return result;
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}
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static int videobuf_dvb_register_frontend(struct dvb_adapter *adapter,
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struct videobuf_dvb *dvb)
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{
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int result;
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/* register frontend */
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result = dvb_register_frontend(adapter, dvb->frontend);
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if (result < 0) {
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printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
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dvb->name, result);
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goto fail_frontend;
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}
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/* register demux stuff */
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dvb->demux.dmx.capabilities =
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DMX_TS_FILTERING | DMX_SECTION_FILTERING |
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DMX_MEMORY_BASED_FILTERING;
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dvb->demux.priv = dvb;
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dvb->demux.filternum = 256;
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dvb->demux.feednum = 256;
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dvb->demux.start_feed = videobuf_dvb_start_feed;
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dvb->demux.stop_feed = videobuf_dvb_stop_feed;
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result = dvb_dmx_init(&dvb->demux);
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if (result < 0) {
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printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
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dvb->name, result);
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goto fail_dmx;
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}
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dvb->dmxdev.filternum = 256;
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dvb->dmxdev.demux = &dvb->demux.dmx;
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dvb->dmxdev.capabilities = 0;
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result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
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if (result < 0) {
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printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
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dvb->name, result);
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goto fail_dmxdev;
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}
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dvb->fe_hw.source = DMX_FRONTEND_0;
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result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
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if (result < 0) {
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printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
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dvb->name, result);
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goto fail_fe_hw;
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}
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dvb->fe_mem.source = DMX_MEMORY_FE;
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result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
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if (result < 0) {
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printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
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dvb->name, result);
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goto fail_fe_mem;
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}
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result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
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if (result < 0) {
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printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
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dvb->name, result);
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goto fail_fe_conn;
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}
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/* register network adapter */
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result = dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
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if (result < 0) {
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printk(KERN_WARNING "%s: dvb_net_init failed (errno = %d)\n",
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dvb->name, result);
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goto fail_fe_conn;
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}
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return 0;
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fail_fe_conn:
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dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
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fail_fe_mem:
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dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
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fail_fe_hw:
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dvb_dmxdev_release(&dvb->dmxdev);
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fail_dmxdev:
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dvb_dmx_release(&dvb->demux);
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fail_dmx:
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dvb_unregister_frontend(dvb->frontend);
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fail_frontend:
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dvb_frontend_detach(dvb->frontend);
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dvb->frontend = NULL;
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return result;
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}
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/* ------------------------------------------------------------------ */
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/* Register a single adapter and one or more frontends */
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int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
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struct module *module,
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void *adapter_priv,
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struct device *device,
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short *adapter_nr,
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int mfe_shared)
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{
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struct list_head *list, *q;
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struct videobuf_dvb_frontend *fe;
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int res;
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fe = videobuf_dvb_get_frontend(f, 1);
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if (!fe) {
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printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
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return -EINVAL;
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}
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/* Bring up the adapter */
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res = videobuf_dvb_register_adapter(f, module, adapter_priv, device,
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fe->dvb.name, adapter_nr, mfe_shared);
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if (res < 0) {
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printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
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return res;
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}
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/* Attach all of the frontends to the adapter */
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mutex_lock(&f->lock);
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list_for_each_safe(list, q, &f->felist) {
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fe = list_entry(list, struct videobuf_dvb_frontend, felist);
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res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb);
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if (res < 0) {
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printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
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fe->dvb.name, res);
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goto err;
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}
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}
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mutex_unlock(&f->lock);
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return 0;
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err:
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mutex_unlock(&f->lock);
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videobuf_dvb_unregister_bus(f);
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return res;
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}
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EXPORT_SYMBOL(videobuf_dvb_register_bus);
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void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
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{
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videobuf_dvb_dealloc_frontends(f);
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dvb_unregister_adapter(&f->adapter);
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}
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EXPORT_SYMBOL(videobuf_dvb_unregister_bus);
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struct videobuf_dvb_frontend *videobuf_dvb_get_frontend(
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struct videobuf_dvb_frontends *f, int id)
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{
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struct list_head *list, *q;
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struct videobuf_dvb_frontend *fe, *ret = NULL;
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mutex_lock(&f->lock);
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list_for_each_safe(list, q, &f->felist) {
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fe = list_entry(list, struct videobuf_dvb_frontend, felist);
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if (fe->id == id) {
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ret = fe;
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break;
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}
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}
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mutex_unlock(&f->lock);
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return ret;
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}
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EXPORT_SYMBOL(videobuf_dvb_get_frontend);
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int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f,
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struct dvb_frontend *p)
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{
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struct list_head *list, *q;
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struct videobuf_dvb_frontend *fe = NULL;
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int ret = 0;
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mutex_lock(&f->lock);
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list_for_each_safe(list, q, &f->felist) {
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fe = list_entry(list, struct videobuf_dvb_frontend, felist);
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if (fe->dvb.frontend == p) {
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ret = fe->id;
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break;
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}
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}
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mutex_unlock(&f->lock);
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return ret;
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}
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EXPORT_SYMBOL(videobuf_dvb_find_frontend);
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struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend(
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struct videobuf_dvb_frontends *f, int id)
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{
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struct videobuf_dvb_frontend *fe;
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fe = kzalloc(sizeof(struct videobuf_dvb_frontend), GFP_KERNEL);
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if (fe == NULL)
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goto fail_alloc;
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fe->id = id;
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mutex_init(&fe->dvb.lock);
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mutex_lock(&f->lock);
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list_add_tail(&fe->felist, &f->felist);
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mutex_unlock(&f->lock);
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fail_alloc:
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return fe;
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}
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EXPORT_SYMBOL(videobuf_dvb_alloc_frontend);
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void videobuf_dvb_dealloc_frontends(struct videobuf_dvb_frontends *f)
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{
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struct list_head *list, *q;
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struct videobuf_dvb_frontend *fe;
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mutex_lock(&f->lock);
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list_for_each_safe(list, q, &f->felist) {
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fe = list_entry(list, struct videobuf_dvb_frontend, felist);
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if (fe->dvb.net.dvbdev) {
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dvb_net_release(&fe->dvb.net);
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fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
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&fe->dvb.fe_mem);
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fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
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&fe->dvb.fe_hw);
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dvb_dmxdev_release(&fe->dvb.dmxdev);
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dvb_dmx_release(&fe->dvb.demux);
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dvb_unregister_frontend(fe->dvb.frontend);
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}
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if (fe->dvb.frontend)
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/* always allocated, may have been reset */
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dvb_frontend_detach(fe->dvb.frontend);
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list_del(list); /* remove list entry */
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kfree(fe); /* free frontend allocation */
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}
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mutex_unlock(&f->lock);
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}
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EXPORT_SYMBOL(videobuf_dvb_dealloc_frontends);
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