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, 14 insertions, 8 deletions

diff --git a/drivers/media/dvb/dvb-usb/m920x.c b/drivers/media/dvb/dvb-usb/m920x.c
index 29ec2b967742..a12e6f784fda 100644
--- a/drivers/media/dvb/dvb-usb/m920x.c
+++ b/drivers/media/dvb/dvb-usb/m920x.c
@@ -22,6 +22,8 @@ static int dvb_usb_m920x_debug;
 module_param_named(debug,dvb_usb_m920x_debug, int, 0644);
 MODULE_PARM_DESC(debug, "set debugging level (1=rc (or-able))." DVB_USB_DEBUG_STATUS);
 
+DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
+
 static int m920x_set_filter(struct dvb_usb_device *d, int type, int idx, int pid);
 
 static inline int m920x_read(struct usb_device *udev, u8 request, u16 value,
@@ -618,27 +620,31 @@ static int m920x_probe(struct usb_interface *intf,
 		 * multi-tuner device
 		 */
 
-		if ((ret = dvb_usb_device_init(intf, &megasky_properties,
-					       THIS_MODULE, &d)) == 0) {
+		ret = dvb_usb_device_init(intf, &megasky_properties,
+					  THIS_MODULE, &d, adapter_nr);
+		if (ret == 0) {
 			rc_init_seq = megasky_rc_init;
 			goto found;
 		}
 
-		if ((ret = dvb_usb_device_init(intf, &digivox_mini_ii_properties,
-					       THIS_MODULE, &d)) == 0) {
+		ret = dvb_usb_device_init(intf, &digivox_mini_ii_properties,
+					  THIS_MODULE, &d, adapter_nr);
+		if (ret == 0) {
 			/* No remote control, so no rc_init_seq */
 			goto found;
 		}
 
 		/* This configures both tuners on the TV Walker Twin */
-		if ((ret = dvb_usb_device_init(intf, &tvwalkertwin_properties,
-					       THIS_MODULE, &d)) == 0) {
+		ret = dvb_usb_device_init(intf, &tvwalkertwin_properties,
+					  THIS_MODULE, &d, adapter_nr);
+		if (ret == 0) {
 			rc_init_seq = tvwalkertwin_rc_init;
 			goto found;
 		}
 
-		if ((ret = dvb_usb_device_init(intf, &dposh_properties,
-					       THIS_MODULE, &d)) == 0) {
+		ret = dvb_usb_device_init(intf, &dposh_properties,
+					  THIS_MODULE, &d, adapter_nr);
+		if (ret == 0) {
 			/* Remote controller not supported yet. */
 			goto found;
 		}