/* * * 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/freezer.h> #include <media/videobuf-core.h> #include <media/videobuf-dvb.h> /* ------------------------------------------------------------------ */ MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]"); MODULE_LICENSE("GPL"); static unsigned int debug; 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; void *outp; dprintk("dvb thread started\n"); set_freezable(); 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); /* no more feeds left or stop_feed() asked us to quit */ if (0 == dvb->nfeeds) break; if (kthread_should_stop()) break; try_to_freeze(); /* feed buffer data to demux */ outp = videobuf_queue_to_vmalloc (&dvb->dvbq, buf); if (buf->state == VIDEOBUF_DONE) dvb_dmx_swfilter(&dvb->demux, outp, 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; mutex_lock(&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: mutex_unlock(&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; mutex_lock(&dvb->lock); dvb->nfeeds--; if (0 == dvb->nfeeds && NULL != dvb->thread) { err = kthread_stop(dvb->thread); dvb->thread = NULL; } mutex_unlock(&dvb->lock); return err; } static int videobuf_dvb_register_adapter(struct videobuf_dvb_frontends *fe, struct module *module, void *adapter_priv, struct device *device, char *adapter_name, short *adapter_nr, int mfe_shared) { int result; mutex_init(&fe->lock); /* register adapter */ result = dvb_register_adapter(&fe->adapter, adapter_name, module, device, adapter_nr); if (result < 0) { printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n", adapter_name, result); } fe->adapter.priv = adapter_priv; fe->adapter.mfe_shared = mfe_shared; return result; } static int videobuf_dvb_register_frontend(struct dvb_adapter *adapter, struct videobuf_dvb *dvb) { int result; /* register frontend */ result = dvb_register_frontend(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, 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(adapter, &dvb->net, &dvb->demux.dmx); if (dvb->net.dvbdev == NULL) { result = -ENOMEM; goto fail_fe_conn; } 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_frontend_detach(dvb->frontend); dvb->frontend = NULL; return result; } /* ------------------------------------------------------------------ */ /* Register a single adapter and one or more frontends */ int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f, struct module *module, void *adapter_priv, struct device *device, short *adapter_nr, int mfe_shared) { struct list_head *list, *q; struct videobuf_dvb_frontend *fe; int res; fe = videobuf_dvb_get_frontend(f, 1); if (!fe) { printk(KERN_WARNING "Unable to register the adapter which has no frontends\n"); return -EINVAL; } /* Bring up the adapter */ res = videobuf_dvb_register_adapter(f, module, adapter_priv, device, fe->dvb.name, adapter_nr, mfe_shared); if (res < 0) { printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res); return res; } /* Attach all of the frontends to the adapter */ mutex_lock(&f->lock); list_for_each_safe(list, q, &f->felist) { fe = list_entry(list, struct videobuf_dvb_frontend, felist); res = videobuf_dvb_register_frontend(&f->adapter, &fe->dvb); if (res < 0) { printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n", fe->dvb.name, res); goto err; } } mutex_unlock(&f->lock); return 0; err: mutex_unlock(&f->lock); videobuf_dvb_unregister_bus(f); return res; } EXPORT_SYMBOL(videobuf_dvb_register_bus); void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f) { videobuf_dvb_dealloc_frontends(f); dvb_unregister_adapter(&f->adapter); } EXPORT_SYMBOL(videobuf_dvb_unregister_bus); struct videobuf_dvb_frontend *videobuf_dvb_get_frontend( struct videobuf_dvb_frontends *f, int id) { struct list_head *list, *q; struct videobuf_dvb_frontend *fe, *ret = NULL; mutex_lock(&f->lock); list_for_each_safe(list, q, &f->felist) { fe = list_entry(list, struct videobuf_dvb_frontend, felist); if (fe->id == id) { ret = fe; break; } } mutex_unlock(&f->lock); return ret; } EXPORT_SYMBOL(videobuf_dvb_get_frontend); int videobuf_dvb_find_frontend(struct videobuf_dvb_frontends *f, struct dvb_frontend *p) { struct list_head *list, *q; struct videobuf_dvb_frontend *fe = NULL; int ret = 0; mutex_lock(&f->lock); list_for_each_safe(list, q, &f->felist) { fe = list_entry(list, struct videobuf_dvb_frontend, felist); if (fe->dvb.frontend == p) { ret = fe->id; break; } } mutex_unlock(&f->lock); return ret; } EXPORT_SYMBOL(videobuf_dvb_find_frontend); struct videobuf_dvb_frontend *videobuf_dvb_alloc_frontend( struct videobuf_dvb_frontends *f, int id) { struct videobuf_dvb_frontend *fe; fe = kzalloc(sizeof(struct videobuf_dvb_frontend), GFP_KERNEL); if (fe == NULL) goto fail_alloc; fe->id = id; mutex_init(&fe->dvb.lock); mutex_lock(&f->lock); list_add_tail(&fe->felist, &f->felist); mutex_unlock(&f->lock); fail_alloc: return fe; } EXPORT_SYMBOL(videobuf_dvb_alloc_frontend); void videobuf_dvb_dealloc_frontends(struct videobuf_dvb_frontends *f) { struct list_head *list, *q; struct videobuf_dvb_frontend *fe; mutex_lock(&f->lock); list_for_each_safe(list, q, &f->felist) { fe = list_entry(list, struct videobuf_dvb_frontend, felist); if (fe->dvb.net.dvbdev) { dvb_net_release(&fe->dvb.net); fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_mem); fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_hw); dvb_dmxdev_release(&fe->dvb.dmxdev); dvb_dmx_release(&fe->dvb.demux); dvb_unregister_frontend(fe->dvb.frontend); } if (fe->dvb.frontend) /* always allocated, may have been reset */ dvb_frontend_detach(fe->dvb.frontend); list_del(list); /* remove list entry */ kfree(fe); /* free frontend allocation */ } mutex_unlock(&f->lock); } EXPORT_SYMBOL(videobuf_dvb_dealloc_frontends);