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>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/media/video/cx88/cx88-dvb.c b/drivers/media/video/cx88/cx88-dvb.c
index e83d9869e68b..fda7334d934b 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);
 }
 
 /* ----------------------------------------------------------- */