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>

15 files changed, 22 insertions, 17 deletions

diff --git a/drivers/media/dvb/b2c2/flexcop.c b/drivers/media/dvb/b2c2/flexcop.c
index 56ba5247067..5c276b3793e 100644
--- a/drivers/media/dvb/b2c2/flexcop.c
+++ b/drivers/media/dvb/b2c2/flexcop.c
@@ -67,7 +67,7 @@ static int flexcop_dvb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
 static int flexcop_dvb_init(struct flexcop_device *fc)
 {
 	int ret;
-	if ((ret = dvb_register_adapter(&fc->dvb_adapter,"FlexCop Digital TV device",fc->owner)) < 0) {
+	if ((ret = dvb_register_adapter(&fc->dvb_adapter,"FlexCop Digital TV device",fc->owner,fc->dev)) < 0) {
 		err("error registering DVB adapter");
 		return ret;
 	}
diff --git a/drivers/media/dvb/bt8xx/dvb-bt8xx.c b/drivers/media/dvb/bt8xx/dvb-bt8xx.c
index ccc7b2eb4a2..1bf3392ac80 100644
--- a/drivers/media/dvb/bt8xx/dvb-bt8xx.c
+++ b/drivers/media/dvb/bt8xx/dvb-bt8xx.c
@@ -713,7 +713,7 @@ static int __devinit dvb_bt8xx_load_card(struct dvb_bt8xx_card *card, u32 type)
 {
 	int result;
 
-	if ((result = dvb_register_adapter(&card->dvb_adapter, card->card_name, THIS_MODULE)) < 0) {
+	if ((result = dvb_register_adapter(&card->dvb_adapter, card->card_name, THIS_MODULE, &card->bt->dev->dev)) < 0) {
 		printk("dvb_bt8xx: dvb_register_adapter failed (errno = %d)\n", result);
 		return result;
 	}
diff --git a/drivers/media/dvb/cinergyT2/cinergyT2.c b/drivers/media/dvb/cinergyT2/cinergyT2.c
index 9325d039ea6..c7e4134872d 100644
--- a/drivers/media/dvb/cinergyT2/cinergyT2.c
+++ b/drivers/media/dvb/cinergyT2/cinergyT2.c
@@ -902,7 +902,7 @@ static int cinergyt2_probe (struct usb_interface *intf,
 		return -ENOMEM;
 	}
 
-	if ((err = dvb_register_adapter(&cinergyt2->adapter, DRIVER_NAME, THIS_MODULE)) < 0) {
+	if ((err = dvb_register_adapter(&cinergyt2->adapter, DRIVER_NAME, THIS_MODULE, &cinergyt2->udev->dev)) < 0) {
 		kfree(cinergyt2);
 		return err;
 	}
diff --git a/drivers/media/dvb/dvb-core/dvbdev.c b/drivers/media/dvb/dvb-core/dvbdev.c
index 3852430d026..134c2bbbeeb 100644
--- a/drivers/media/dvb/dvb-core/dvbdev.c
+++ b/drivers/media/dvb/dvb-core/dvbdev.c
@@ -236,7 +236,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 			"dvb/adapter%d/%s%d", adap->num, dnames[type], id);
 
 	class_device_create(dvb_class, NULL, MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
-			    NULL, "dvb%d.%s%d", adap->num, dnames[type], id);
+			    adap->device, "dvb%d.%s%d", adap->num, dnames[type], id);
 
 	dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 		adap->num, dnames[type], id, nums2minor(adap->num, type, id),
@@ -285,7 +285,7 @@ skip:
 }
 
 
-int dvb_register_adapter(struct dvb_adapter *adap, const char *name, struct module *module)
+int dvb_register_adapter(struct dvb_adapter *adap, const char *name, struct module *module, struct device *device)
 {
 	int num;
 
@@ -306,6 +306,7 @@ int dvb_register_adapter(struct dvb_adapter *adap, const char *name, struct modu
 	adap->num = num;
 	adap->name = name;
 	adap->module = module;
+	adap->device = device;
 
 	list_add_tail (&adap->list_head, &dvb_adapter_list);
 
diff --git a/drivers/media/dvb/dvb-core/dvbdev.h b/drivers/media/dvb/dvb-core/dvbdev.h
index 74ed5853f0f..d7a976d040d 100644
--- a/drivers/media/dvb/dvb-core/dvbdev.h
+++ b/drivers/media/dvb/dvb-core/dvbdev.h
@@ -51,6 +51,8 @@ struct dvb_adapter {
 	u8 proposed_mac [6];
 	void* priv;
 
+	struct device *device;
+
 	struct module *module;
 };
 
@@ -76,7 +78,7 @@ struct dvb_device {
 };
 
 
-extern int dvb_register_adapter (struct dvb_adapter *adap, const char *name, struct module *module);
+extern int dvb_register_adapter (struct dvb_adapter *adap, const char *name, struct module *module, struct device *device);
 extern int dvb_unregister_adapter (struct dvb_adapter *adap);
 
 extern int dvb_register_device (struct dvb_adapter *adap,
diff --git a/drivers/media/dvb/dvb-usb/dvb-usb-dvb.c b/drivers/media/dvb/dvb-usb/dvb-usb-dvb.c
index 6fa92100248..500896d02d5 100644
--- a/drivers/media/dvb/dvb-usb/dvb-usb-dvb.c
+++ b/drivers/media/dvb/dvb-usb/dvb-usb-dvb.c
@@ -82,7 +82,7 @@ int dvb_usb_dvb_init(struct dvb_usb_device *d)
 	int ret;
 
 	if ((ret = dvb_register_adapter(&d->dvb_adap, d->desc->name,
-			d->owner)) < 0) {
+			d->owner, &d->udev->dev)) < 0) {
 		deb_info("dvb_register_adapter failed: error %d", ret);
 		goto err;
 	}
diff --git a/drivers/media/dvb/pluto2/pluto2.c b/drivers/media/dvb/pluto2/pluto2.c
index 1c5316e209e..c9afad038c1 100644
--- a/drivers/media/dvb/pluto2/pluto2.c
+++ b/drivers/media/dvb/pluto2/pluto2.c
@@ -647,7 +647,7 @@ static int __devinit pluto2_probe(struct pci_dev *pdev,
 		goto err_pluto_hw_exit;
 
 	/* dvb */
-	ret = dvb_register_adapter(&pluto->dvb_adapter, DRIVER_NAME, THIS_MODULE);
+	ret = dvb_register_adapter(&pluto->dvb_adapter, DRIVER_NAME, THIS_MODULE, &pdev->dev);
 	if (ret < 0)
 		goto err_i2c_bit_del_bus;
 
diff --git a/drivers/media/dvb/ttpci/av7110.c b/drivers/media/dvb/ttpci/av7110.c
index d028245c8ee..21e331d32ca 100644
--- a/drivers/media/dvb/ttpci/av7110.c
+++ b/drivers/media/dvb/ttpci/av7110.c
@@ -2413,7 +2413,7 @@ static int __devinit av7110_attach(struct saa7146_dev* dev,
 		goto err_kfree_0;
 
 	ret = dvb_register_adapter(&av7110->dvb_adapter, av7110->card_name,
-				   THIS_MODULE);
+				   THIS_MODULE, &dev->pci->dev);
 	if (ret < 0)
 		goto err_put_firmware_1;
 
diff --git a/drivers/media/dvb/ttpci/budget-core.c b/drivers/media/dvb/ttpci/budget-core.c
index d8af690fa55..e4cf7775e07 100644
--- a/drivers/media/dvb/ttpci/budget-core.c
+++ b/drivers/media/dvb/ttpci/budget-core.c
@@ -400,7 +400,7 @@ int ttpci_budget_init(struct budget *budget, struct saa7146_dev *dev,
 		budget->dev->name, budget->buffer_width, budget->buffer_height);
 	printk("%s: dma buffer size %u\n", budget->dev->name, budget->buffer_size);
 
-	if ((ret = dvb_register_adapter(&budget->dvb_adapter, budget->card->name, owner)) < 0) {
+	if ((ret = dvb_register_adapter(&budget->dvb_adapter, budget->card->name, owner, &budget->dev->pci->dev)) < 0) {
 		return ret;
 	}
 
diff --git a/drivers/media/dvb/ttusb-budget/dvb-ttusb-budget.c b/drivers/media/dvb/ttusb-budget/dvb-ttusb-budget.c
index 6ceae38125c..95558608b03 100644
--- a/drivers/media/dvb/ttusb-budget/dvb-ttusb-budget.c
+++ b/drivers/media/dvb/ttusb-budget/dvb-ttusb-budget.c
@@ -1507,7 +1507,7 @@ static int ttusb_probe(struct usb_interface *intf, const struct usb_device_id *i
 
 	mutex_unlock(&ttusb->semi2c);
 
-	if ((result = dvb_register_adapter(&ttusb->adapter, "Technotrend/Hauppauge Nova-USB", THIS_MODULE)) < 0) {
+	if ((result = dvb_register_adapter(&ttusb->adapter, "Technotrend/Hauppauge Nova-USB", THIS_MODULE, &udev->dev)) < 0) {
 		ttusb_free_iso_urbs(ttusb);
 		kfree(ttusb);
 		return result;
diff --git a/drivers/media/dvb/ttusb-dec/ttusb_dec.c b/drivers/media/dvb/ttusb-dec/ttusb_dec.c
index 44dea321184..da1090afad5 100644
--- a/drivers/media/dvb/ttusb-dec/ttusb_dec.c
+++ b/drivers/media/dvb/ttusb-dec/ttusb_dec.c
@@ -1432,7 +1432,7 @@ static int ttusb_dec_init_dvb(struct ttusb_dec *dec)
 	dprintk("%s\n", __FUNCTION__);
 
 	if ((result = dvb_register_adapter(&dec->adapter,
-					   dec->model_name, THIS_MODULE)) < 0) {
+					   dec->model_name, THIS_MODULE, &dec->udev->dev)) < 0) {
 		printk("%s: dvb_register_adapter failed: error %d\n",
 		       __FUNCTION__, result);
 
diff --git a/drivers/media/video/cx88/cx88-dvb.c b/drivers/media/video/cx88/cx88-dvb.c
index 5c05e09e73f..28e0d3d9451 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 222a36c3891..98a492ddc21 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 caf3e7e2f21..7ee8a53cd33 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);
diff --git a/include/media/video-buf-dvb.h b/include/media/video-buf-dvb.h
index b78d90fe629..8233cafdeef 100644
--- a/include/media/video-buf-dvb.h
+++ b/include/media/video-buf-dvb.h
@@ -26,7 +26,8 @@ struct videobuf_dvb {
 
 int videobuf_dvb_register(struct videobuf_dvb *dvb,
 			  struct module *module,
-			  void *adapter_priv);
+			  void *adapter_priv,
+			  struct device *device);
 void videobuf_dvb_unregister(struct videobuf_dvb *dvb);
 
 /*