/* * $Id: video-buf-dvb.c,v 1.7 2004/12/09 12:51:35 kraxel Exp $ * * some helper function for simple DVB cards which simply DMA the * complete transport stream and let the computer sort everything else * (i.e. we are using the software demux, ...). Also uses the * video-buf to manage DMA buffers. * * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/module.h> #include <linux/init.h> #include <linux/device.h> #include <linux/fs.h> #include <linux/kthread.h> #include <linux/file.h> #include <linux/suspend.h> #include <media/video-buf.h> #include <media/video-buf-dvb.h> /* ------------------------------------------------------------------ */ MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]"); MODULE_LICENSE("GPL"); static unsigned int debug = 0; module_param(debug, int, 0644); MODULE_PARM_DESC(debug,"enable debug messages"); #define dprintk(fmt, arg...) if (debug) \ printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg) /* ------------------------------------------------------------------ */ static int videobuf_dvb_thread(void *data) { struct videobuf_dvb *dvb = data; struct videobuf_buffer *buf; unsigned long flags; int err; dprintk("dvb thread started\n"); videobuf_read_start(&dvb->dvbq); for (;;) { /* fetch next buffer */ buf = list_entry(dvb->dvbq.stream.next, struct videobuf_buffer, stream); list_del(&buf->stream); err = videobuf_waiton(buf,0,1); BUG_ON(0 != err); /* no more feeds left or stop_feed() asked us to quit */ if (0 == dvb->nfeeds) break; if (kthread_should_stop()) break; if (current->flags & PF_FREEZE) refrigerator(PF_FREEZE); /* feed buffer data to demux */ if (buf->state == STATE_DONE) dvb_dmx_swfilter(&dvb->demux, buf->dma.vmalloc, buf->size); /* requeue buffer */ list_add_tail(&buf->stream,&dvb->dvbq.stream); spin_lock_irqsave(dvb->dvbq.irqlock,flags); dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf); spin_unlock_irqrestore(dvb->dvbq.irqlock,flags); } videobuf_read_stop(&dvb->dvbq); dprintk("dvb thread stopped\n"); /* Hmm, linux becomes *very* unhappy without this ... */ while (!kthread_should_stop()) { set_current_state(TASK_INTERRUPTIBLE); schedule(); } return 0; } static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed) { struct dvb_demux *demux = feed->demux; struct videobuf_dvb *dvb = demux->priv; int rc; if (!demux->dmx.frontend) return -EINVAL; down(&dvb->lock); dvb->nfeeds++; rc = dvb->nfeeds; if (NULL != dvb->thread) goto out; dvb->thread = kthread_run(videobuf_dvb_thread, dvb, "%s dvb", dvb->name); if (IS_ERR(dvb->thread)) { rc = PTR_ERR(dvb->thread); dvb->thread = NULL; } out: up(&dvb->lock); return rc; } static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed) { struct dvb_demux *demux = feed->demux; struct videobuf_dvb *dvb = demux->priv; int err = 0; down(&dvb->lock); dvb->nfeeds--; if (0 == dvb->nfeeds && NULL != dvb->thread) { // FIXME: cx8802_cancel_buffers(dev); err = kthread_stop(dvb->thread); dvb->thread = NULL; } up(&dvb->lock); return err; } /* ------------------------------------------------------------------ */ int videobuf_dvb_register(struct videobuf_dvb *dvb, struct module *module, void *adapter_priv) { int result; init_MUTEX(&dvb->lock); /* register adapter */ result = dvb_register_adapter(&dvb->adapter, dvb->name, module); if (result < 0) { printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n", dvb->name, result); goto fail_adapter; } dvb->adapter->priv = adapter_priv; /* register frontend */ result = dvb_register_frontend(dvb->adapter, dvb->frontend); if (result < 0) { printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n", dvb->name, result); goto fail_frontend; } /* register demux stuff */ dvb->demux.dmx.capabilities = DMX_TS_FILTERING | DMX_SECTION_FILTERING | DMX_MEMORY_BASED_FILTERING; dvb->demux.priv = dvb; dvb->demux.filternum = 256; dvb->demux.feednum = 256; dvb->demux.start_feed = videobuf_dvb_start_feed; dvb->demux.stop_feed = videobuf_dvb_stop_feed; result = dvb_dmx_init(&dvb->demux); if (result < 0) { printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n", dvb->name, result); goto fail_dmx; } dvb->dmxdev.filternum = 256; dvb->dmxdev.demux = &dvb->demux.dmx; dvb->dmxdev.capabilities = 0; result = dvb_dmxdev_init(&dvb->dmxdev, dvb->adapter); if (result < 0) { printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n", dvb->name, result); goto fail_dmxdev; } dvb->fe_hw.source = DMX_FRONTEND_0; result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw); if (result < 0) { printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n", dvb->name, result); goto fail_fe_hw; } dvb->fe_mem.source = DMX_MEMORY_FE; result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem); if (result < 0) { printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n", dvb->name, result); goto fail_fe_mem; } result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw); if (result < 0) { printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n", dvb->name, result); goto fail_fe_conn; } /* register network adapter */ dvb_net_init(dvb->adapter, &dvb->net, &dvb->demux.dmx); return 0; fail_fe_conn: dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem); fail_fe_mem: dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw); fail_fe_hw: dvb_dmxdev_release(&dvb->dmxdev); fail_dmxdev: dvb_dmx_release(&dvb->demux); fail_dmx: dvb_unregister_frontend(dvb->frontend); fail_frontend: dvb_unregister_adapter(dvb->adapter); fail_adapter: return result; } void videobuf_dvb_unregister(struct videobuf_dvb *dvb) { dvb_net_release(&dvb->net); dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem); dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw); dvb_dmxdev_release(&dvb->dmxdev); dvb_dmx_release(&dvb->demux); dvb_unregister_frontend(dvb->frontend); dvb_unregister_adapter(dvb->adapter); } EXPORT_SYMBOL(videobuf_dvb_register); EXPORT_SYMBOL(videobuf_dvb_unregister); /* ------------------------------------------------------------------ */ /* * Local variables: * c-basic-offset: 8 * compile-command: "make DVB=1" * End: */