V4L/DVB (7681): pvrusb2-dvb: start working on streaming / buffer handling code

start work on streaming / buffer handling code to feed the software demux

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

2 files changed, 45 insertions, 2 deletions

diff --git a/drivers/media/video/pvrusb2/pvrusb2-dvb.c b/drivers/media/video/pvrusb2/pvrusb2-dvb.c
index 250462265a41..c85477709e6e 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-dvb.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-dvb.c
@@ -18,6 +18,7 @@
  *
  */
 
+#include <linux/kthread.h>
 #include "dvbdev.h"
 #include "pvrusb2-hdw-internal.h"
 #include "pvrusb2-hdw.h"
@@ -25,18 +26,56 @@
 
 DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
 
+static int pvr2_dvb_ctrl_feed(struct dvb_demux_feed *dvbdmxfeed, int onoff)
+{
+        struct pvr2_dvb_adapter *adap = dvbdmxfeed->demux->priv;
+        int newfeedcount, ret = 0;
+
+        if (adap == NULL)
+                return -ENODEV;
+
+        mutex_lock(&adap->lock);
+        newfeedcount = adap->feedcount + (onoff ? 1 : -1);
+
+        if (newfeedcount == 0) {
+                printk(KERN_DEBUG "stop feeding\n");
+
+                ret = kthread_stop(adap->thread);
+                adap->thread = NULL;
+        }
+
+        adap->feedcount = newfeedcount;
+
+        if (adap->feedcount == onoff && adap->feedcount > 0) {
+                if (NULL != adap->thread)
+                        goto fail;
+
+                printk(KERN_DEBUG "start feeding\n");
+
+                if (IS_ERR(adap->thread)) {
+                        ret = PTR_ERR(adap->thread);
+                        adap->thread = NULL;
+                }
+                //ret = newfeedcount;
+        }
+fail:
+        mutex_unlock(&adap->lock);
+
+        return ret;
+}
+
 static int pvr2_dvb_start_feed(struct dvb_demux_feed *dvbdmxfeed)
 {
         printk(KERN_DEBUG "start pid: 0x%04x, feedtype: %d\n",
                dvbdmxfeed->pid, dvbdmxfeed->type);
-        return 0; /* FIXME: pvr2_dvb_ctrl_feed(dvbdmxfeed, 1); */
+        return pvr2_dvb_ctrl_feed(dvbdmxfeed, 1);
 }
 
 static int pvr2_dvb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
 {
         printk(KERN_DEBUG "stop pid: 0x%04x, feedtype: %d\n",
                dvbdmxfeed->pid, dvbdmxfeed->type);
-        return 0; /* FIXME: pvr2_dvb_ctrl_feed(dvbdmxfeed, 0); */
+        return pvr2_dvb_ctrl_feed(dvbdmxfeed, 0);
 }
 
 static int pvr2_dvb_bus_ctrl(struct dvb_frontend *fe, int acquire)
@@ -172,6 +211,7 @@ int pvr2_dvb_init(struct pvr2_context *pvr)
         int ret = 0;
 
         pvr->hdw->dvb.pvr = pvr;
+        mutex_init(&pvr->hdw->dvb.lock);
 
         ret = pvr2_dvb_adapter_init(&pvr->hdw->dvb);
         if (ret < 0)
diff --git a/drivers/media/video/pvrusb2/pvrusb2-dvb.h b/drivers/media/video/pvrusb2/pvrusb2-dvb.h
index 0aff05cb9415..98728d44a4b6 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-dvb.h
+++ b/drivers/media/video/pvrusb2/pvrusb2-dvb.h
@@ -19,6 +19,9 @@ struct pvr2_dvb_adapter {
         int                     feedcount;
         int                     max_feed_count;
 
+        struct task_struct      *thread;
+        struct mutex            lock;
+
         unsigned int            digital_up:1;
 };