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path: root/drivers/media/video/videobuf-dvb.c
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Diffstat (limited to 'drivers/media/video/videobuf-dvb.c')
-rw-r--r--drivers/media/video/videobuf-dvb.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/drivers/media/video/videobuf-dvb.c b/drivers/media/video/videobuf-dvb.c
new file mode 100644
index 00000000000..880317e04a0
--- /dev/null
+++ b/drivers/media/video/videobuf-dvb.c
@@ -0,0 +1,256 @@
+/*
+ *
+ * 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-dma-sg.h>
+#include <media/videobuf-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;
+ struct videobuf_dmabuf *dma;
+
+ 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 */
+ dma=videobuf_to_dma(buf);
+ if (buf->state == STATE_DONE)
+ dvb_dmx_swfilter(&dvb->demux, 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;
+
+ 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) {
+ // FIXME: cx8802_cancel_buffers(dev);
+ err = kthread_stop(dvb->thread);
+ dvb->thread = NULL;
+ }
+ mutex_unlock(&dvb->lock);
+ return err;
+}
+
+/* ------------------------------------------------------------------ */
+
+int videobuf_dvb_register(struct videobuf_dvb *dvb,
+ struct module *module,
+ void *adapter_priv,
+ struct device *device)
+{
+ int result;
+
+ mutex_init(&dvb->lock);
+
+ /* register adapter */
+ result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device);
+ 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_frontend_detach(dvb->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_frontend_detach(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:
+ */
+
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-03 12:49:07 +0000