V4L/DVB (7538): Adds selectable adapter numbers as per module option

The adapter_nr module options can be used to allocate static adapter
numbers on a driver level. It avoids problems with changing DVB apapter
numbers after warm/cold boot or device unplugging and repluging.

Each driver holds DVB_MAX_ADAPTER long array of the preferred order of
adapter numbers.

options dvb-usb-dib0700 adapter_nr=7,6,5,4,3,2,1,0 would result in a
reversed allocation of adapter numbers.

With adapter_nr=2,5 it tries first to get adapter number 2 and 5. If
both are already in use it will allocate the lowest free adapter number.

Signed-off-by: Janne Grunau <janne-dvb@grunau.be>
Acked-by: Hermann Pitton <hermann.pitton@arcor.de>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

4 files changed, 15 insertions, 5 deletions

diff --git a/drivers/media/video/cx23885/cx23885-dvb.c b/drivers/media/video/cx23885/cx23885-dvb.c
index 74baa28..1a720ab 100644
--- a/drivers/media/video/cx23885/cx23885-dvb.c
+++ b/drivers/media/video/cx23885/cx23885-dvb.c
@@ -54,6 +54,8 @@ static unsigned int alt_tuner;
 module_param(alt_tuner, int, 0644);
 MODULE_PARM_DESC(alt_tuner, "Enable alternate tuner configuration");
 
+DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
+
 /* ------------------------------------------------------------------ */
 
 static int dvb_buf_setup(struct videobuf_queue *q,
@@ -333,7 +335,7 @@ static int dvb_register(struct cx23885_tsport *port)
 
 	/* register everything */
 	return videobuf_dvb_register(&port->dvb, THIS_MODULE, port,
-				     &dev->pci->dev);
+				     &dev->pci->dev, adapter_nr);
 }
 
 int cx23885_dvb_register(struct cx23885_tsport *port)
diff --git a/drivers/media/video/cx88/cx88-dvb.c b/drivers/media/video/cx88/cx88-dvb.c
index e83d986..fda7334 100644
--- a/drivers/media/video/cx88/cx88-dvb.c
+++ b/drivers/media/video/cx88/cx88-dvb.c
@@ -58,6 +58,8 @@ static unsigned int debug;
 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug,"enable debug messages [dvb]");
 
+DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
+
 #define dprintk(level,fmt, arg...)	if (debug >= level) \
 	printk(KERN_DEBUG "%s/2-dvb: " fmt, core->name, ## arg)
 
@@ -862,7 +864,8 @@ 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, &dev->pci->dev);
+	return videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev,
+				     &dev->pci->dev, adapter_nr);
 }
 
 /* ----------------------------------------------------------- */
diff --git a/drivers/media/video/saa7134/saa7134-dvb.c b/drivers/media/video/saa7134/saa7134-dvb.c
index e5c3569..73154c1 100644
--- a/drivers/media/video/saa7134/saa7134-dvb.c
+++ b/drivers/media/video/saa7134/saa7134-dvb.c
@@ -65,6 +65,8 @@ static int debug;
 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Turn on/off module debugging (default:off).");
 
+DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
+
 #define dprintk(fmt, arg...)	do { if (debug) \
 	printk(KERN_DEBUG "%s/dvb: " fmt, dev->name , ## arg); } while(0)
 
@@ -1257,7 +1259,8 @@ static int dvb_init(struct saa7134_dev *dev)
 	}
 
 	/* register everything else */
-	ret = videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev, &dev->pci->dev);
+	ret = videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev, &dev->pci->dev,
+				    adapter_nr);
 
 	/* this sequence is necessary to make the tda1004x load its firmware
 	 * and to enter analog mode of hybrid boards
diff --git a/drivers/media/video/videobuf-dvb.c b/drivers/media/video/videobuf-dvb.c
index 4ba8b7d..0f8542a 100644
--- a/drivers/media/video/videobuf-dvb.c
+++ b/drivers/media/video/videobuf-dvb.c
@@ -138,14 +138,16 @@ 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,
-			  struct device *device)
+			  struct device *device,
+			  short *adapter_nr)
 {
 	int result;
 
 	mutex_init(&dvb->lock);
 
 	/* register adapter */
-	result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device);
+	result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device,
+				      adapter_nr);
 	if (result < 0) {
 		printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
 		       dvb->name, result);