[PATCH] Restore tuning capabilities in V4L2 MXB driver

The behaviour of the all-in-one Video4Linux tuner driver apparently
changed.  It now wants to know the tv standard, otherwise it refuses to
tune.

Restore tuning functionality in my driver for the "Multimedia eXtension
Board".  The all-in-one tuner driver apparently changed its behaviour.
Signed-off-by: Michael Hunold <hunold@linuxtv.org>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/media/video/mxb.c

 /*
     mxb - v4l2 driver for the Multimedia eXtension Board
     
-    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
+    Copyright (C) 1998-2006 Michael Hunold <michael@mihu.de>
 
     Visit http://www.mihu.de/linux/saa7146/mxb/
     for further details about this card.
@@ -327,6 +327,7 @@ static int mxb_init_done(struct saa7146_dev* dev)
 	struct video_decoder_init init;
 	struct i2c_msg msg;
 	struct tuner_setup tun_setup;
+	v4l2_std_id std = V4L2_STD_PAL_BG;
 
 	int i = 0, err = 0;
 	struct	tea6415c_multiplex vm;	
@@ -361,6 +362,9 @@ static int mxb_init_done(struct saa7146_dev* dev)
 	mxb->tuner->driver->command(mxb->tuner, VIDIOC_S_FREQUENCY,
 					&mxb->cur_freq);
 
+	/* set a default video standard */
+	mxb->tuner->driver->command(mxb->tuner, VIDIOC_S_STD, &std);
+
 	/* mute audio on tea6420s */
 	mxb->tea6420_1->driver->command(mxb->tea6420_1,TEA6420_SWITCH, &TEA6420_line[6][0]);
 	mxb->tea6420_2->driver->command(mxb->tea6420_2,TEA6420_SWITCH, &TEA6420_line[6][1]);
@@ -921,17 +925,21 @@ static int std_callback(struct saa7146_dev* dev, struct saa7146_standard *std)
 	int one = 1;
 
 	if(V4L2_STD_PAL_I == std->id ) {
+		v4l2_std_id std = V4L2_STD_PAL_I;
 		DEB_D(("VIDIOC_S_STD: setting mxb for PAL_I.\n"));
 		/* set the 7146 gpio register -- I don't know what this does exactly */
       		saa7146_write(dev, GPIO_CTRL, 0x00404050);
 		/* unset the 7111 gpio register -- I don't know what this does exactly */
 		mxb->saa7111a->driver->command(mxb->saa7111a,DECODER_SET_GPIO, &zero);
+		mxb->tuner->driver->command(mxb->tuner, VIDIOC_S_STD, &std);
 	} else {
+		v4l2_std_id std = V4L2_STD_PAL_BG;
 		DEB_D(("VIDIOC_S_STD: setting mxb for PAL/NTSC/SECAM.\n"));
 		/* set the 7146 gpio register -- I don't know what this does exactly */
       		saa7146_write(dev, GPIO_CTRL, 0x00404050);
 		/* set the 7111 gpio register -- I don't know what this does exactly */
 		mxb->saa7111a->driver->command(mxb->saa7111a,DECODER_SET_GPIO, &one);
+		mxb->tuner->driver->command(mxb->tuner, VIDIOC_S_STD, &std);
 	}
 	return 0;
 }