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 000000000000..880317e04a02
--- /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:
+ */
+