V4L/DVB (3762): Add sysfs device links to dvb devices

Currently in /sys/class/dvb/dvbX.demuxY/ we have:
	dev
	uevent
With the patch, we have (for a PCI DVB device):
	dev
	device -> ../../../devices/pci0000:00/0000:00:1e.0/0000:03:0d.0
	uevent
So userspace tools can (finally) work out which physical device a DVB adapter
refers to. Previously you had to kinda look through dmesg and hope that it
hadn't been dumped out of the buffer. This makes debugging a lot easier if
the system has been up for a long time!
This is done by adding an extra 'struct device *' parameter to
dvb_register_adapter(). It will work with any kind of standard
linux 'device'. Additionally, if someone has an embedded system which does
things differently, they can simply supply 'NULL' and the behaviour will be
as before - the link will simply not appear.

Ack'd-by: Manu Abraham <manu@linuxtv.org>
Acked-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

3 files changed, 5 insertions, 4 deletions

diff --git a/drivers/media/video/cx88/cx88-dvb.c b/drivers/media/video/cx88/cx88-dvb.c
index 5c05e09e73fa..28e0d3d94515 100644
--- a/drivers/media/video/cx88/cx88-dvb.c
+++ b/drivers/media/video/cx88/cx88-dvb.c
@@ -722,7 +722,7 @@ static int dvb_register(struct cx8802_dev *dev)
         cx88_call_i2c_clients (dev->core, TUNER_SET_STANDBY, NULL);
 
         /* register everything */
-        return videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev);
+        return videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev, &dev->pci->dev);
 }
 
 /* ----------------------------------------------------------- */
diff --git a/drivers/media/video/saa7134/saa7134-dvb.c b/drivers/media/video/saa7134/saa7134-dvb.c
index 222a36c38917..98a492ddc216 100644
--- a/drivers/media/video/saa7134/saa7134-dvb.c
+++ b/drivers/media/video/saa7134/saa7134-dvb.c
@@ -1088,7 +1088,7 @@ static int dvb_init(struct saa7134_dev *dev)
         }
 
         /* register everything else */
-        return videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev);
+        return videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev, &dev->pci->dev);
 }
 
 static int dvb_fini(struct saa7134_dev *dev)
diff --git a/drivers/media/video/video-buf-dvb.c b/drivers/media/video/video-buf-dvb.c
index caf3e7e2f219..7ee8a53cd336 100644
--- a/drivers/media/video/video-buf-dvb.c
+++ b/drivers/media/video/video-buf-dvb.c
@@ -135,14 +135,15 @@ static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
 
 int videobuf_dvb_register(struct videobuf_dvb *dvb,
                           struct module *module,
-                          void *adapter_priv)
+                          void *adapter_priv,
+                          struct device *device)
 {
         int result;
 
         mutex_init(&dvb->lock);
 
         /* register adapter */
-        result = dvb_register_adapter(&dvb->adapter, dvb->name, module);
+        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);