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, 6 insertions, 1 deletions

diff --git a/drivers/media/dvb/cinergyT2/cinergyT2.c b/drivers/media/dvb/cinergyT2/cinergyT2.c
index 29b2459e0b21..f5010e8671b8 100644
--- a/drivers/media/dvb/cinergyT2/cinergyT2.c
+++ b/drivers/media/dvb/cinergyT2/cinergyT2.c
@@ -58,6 +58,8 @@ static int debug;
 module_param_named(debug, debug, int, 0644);
 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
 
+DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
+
 #define dprintk(level, args...)                                         \
 do {                                                                    \
         if ((debug & level)) {                                          \
@@ -938,7 +940,10 @@ static int cinergyt2_probe (struct usb_interface *intf,
                 return -ENOMEM;
         }
 
-        if ((err = dvb_register_adapter(&cinergyt2->adapter, DRIVER_NAME, THIS_MODULE, &cinergyt2->udev->dev)) < 0) {
+        err = dvb_register_adapter(&cinergyt2->adapter, DRIVER_NAME,
+                                   THIS_MODULE, &cinergyt2->udev->dev,
+                                   adapter_nr);
+        if (err < 0) {
                 kfree(cinergyt2);
                 return err;
         }