Add the video4linux driver for the "Multimedia eXtension Board",

an analogue tv card based on the saa7146.

Warning: Makefile and Kconfig will most likely be changed by
Gerd Knorr as well, so be sure to change these accordingly.

Warning2: "saa7111" is already available in the kernel, but needs
to be modified, as well as "video_decoder" in include/linux

1 files changed, 1009 insertions, 0 deletions

diff --git a/linux/drivers/media/video/mxb.c b/linux/drivers/media/video/mxb.c
new file mode 100644
index 000000000..094cbbf9a
--- /dev/null
+++ b/linux/drivers/media/video/mxb.c
@@ -0,0 +1,1009 @@
+/*
+    mxb.c - v4l2 driver for the Multimedia eXtension Board
+    
+    Copyright (C) 1998-2002 Michael Hunold <michael@mihu.de>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <saa7146.h>
+
+#include "mxb.h"
+#include "tea6415c.h"
+#include "tea6420.h"
+#include "tda9840.h"
+#include "tuner.h"
+#include <linux/video_decoder.h>	/* for saa7111a */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,51)
+	#define KBUILD_MODNAME "mxb"
+#endif
+
+#define I2C_SAA7111A            0x24
+
+/* global variable */
+static int mxb_num = 0;
+
+/* initial frequence the tuner will be tuned to. 
+   in verden (lower saxony, germany) 4148 is a
+   channel called "phoenix" */
+static int freq = 4148;
+
+/* debug verbosity */
+/* fixme */
+static int debug = 247;
+
+#ifdef MODULE
+MODULE_PARM(freq,"i");
+MODULE_PARM_DESC(freq, "initial frequency the tuner will be tuned to while setup");
+MODULE_PARM(debug,"i");
+MODULE_PARM_DESC(debug, "debug verbosity");
+#endif
+
+
+#define MXB_INPUTS	4
+enum { TUNER, AUX1, AUX3, AUX3_YC };
+
+static struct v4l2_input mxb_inputs[MXB_INPUTS] = {
+	{ TUNER,	"Tuner",		V4L2_INPUT_TYPE_TUNER,	1, 1, V4L2_STD_PAL_BG|V4L2_STD_NTSC_M, 0 }, 
+	{ AUX1,		"AUX1",			V4L2_INPUT_TYPE_CAMERA,	2, 0, V4L2_STD_PAL_BG|V4L2_STD_NTSC_M, 0 },
+	{ AUX3,		"AUX3 Composite",	V4L2_INPUT_TYPE_CAMERA,	4, 0, V4L2_STD_PAL_BG|V4L2_STD_NTSC_M, 0 },
+	{ AUX3_YC,	"AUX3 S-Video",		V4L2_INPUT_TYPE_CAMERA,	4, 0, V4L2_STD_PAL_BG|V4L2_STD_NTSC_M, 0 },
+};
+
+/* this array holds the information, which port of the saa7146 each
+   input actually uses. the mxb uses port 0 for every input */
+static struct {
+	int hps_source;
+	int hps_sync;
+} input_port_selection[MXB_INPUTS] = { 	
+	{ SAA7146_HPS_SOURCE_PORT_A, SAA7146_HPS_SYNC_PORT_A },
+	{ SAA7146_HPS_SOURCE_PORT_A, SAA7146_HPS_SYNC_PORT_A },
+	{ SAA7146_HPS_SOURCE_PORT_A, SAA7146_HPS_SYNC_PORT_A },
+	{ SAA7146_HPS_SOURCE_PORT_A, SAA7146_HPS_SYNC_PORT_A },
+};
+
+/* this array holds the information of the audio source (mxb_audios),
+   which has to be switched corresponding to the video source (mxb_channels) */
+static int video_audio_connect[MXB_AUDIOS] =
+	{ 0, 1, 2, 3, 3 };
+
+/* these are the necessary input-output-pins for bringing one audio source
+(see above) to the CD-output */
+static struct audio_multiplex TEA6420_cd[MXB_AUDIOS+1][2] =
+		{ 
+		{{1,1,0},{1,1,0}},	/* Tuner */
+		{{5,1,0},{6,1,0}},	/* AUX 1 */
+		{{4,1,0},{6,1,0}},	/* AUX 2 */
+		{{3,1,0},{6,1,0}},	/* AUX 3 */
+		{{1,1,0},{3,1,0}},	/* Radio */
+		{{1,1,0},{2,1,0}},	/* CD-Rom */
+		{{6,1,0},{6,1,0}}	/* Mute */
+		};
+
+/* these are the necessary input-output-pins for bringing one audio source
+(see above) to the line-output */
+static struct audio_multiplex TEA6420_line[MXB_AUDIOS+1][2] =
+		{
+		{{2,3,0},{1,2,0}},
+		{{5,3,0},{6,2,0}},
+		{{4,3,0},{6,2,0}},
+		{{3,3,0},{6,2,0}},
+		{{2,3,0},{3,2,0}},
+		{{2,3,0},{2,2,0}},
+		{{6,3,0},{6,2,0}}	/* Mute */
+		};
+
+#define MAXCONTROLS	1
+static struct v4l2_queryctrl mxb_controls[] = {
+	{ V4L2_CID_AUDIO_MUTE, V4L2_CTRL_TYPE_BOOLEAN, "Mute", 0, 1, 1, 0, 0 },
+};
+
+static struct saa7146_extension_ioctls ioctls[] = {
+	{ VIDIOC_ENUMINPUT, 	SAA7146_EXCLUSIVE },
+	{ VIDIOC_G_INPUT,	SAA7146_EXCLUSIVE },
+	{ VIDIOC_S_INPUT,	SAA7146_EXCLUSIVE },
+	{ VIDIOC_QUERYCTRL, 	SAA7146_BEFORE },
+	{ VIDIOC_G_CTRL,	SAA7146_BEFORE },
+	{ VIDIOC_S_CTRL,	SAA7146_BEFORE },
+	{ VIDIOC_G_TUNER, 	SAA7146_EXCLUSIVE },
+	{ VIDIOC_S_TUNER, 	SAA7146_EXCLUSIVE },
+	{ VIDIOC_G_FREQUENCY,	SAA7146_EXCLUSIVE },
+	{ VIDIOC_S_FREQUENCY, 	SAA7146_EXCLUSIVE },
+	{ VIDIOC_G_AUDIO, 	SAA7146_EXCLUSIVE },
+	{ VIDIOC_S_AUDIO, 	SAA7146_EXCLUSIVE },
+	{ MXB_S_AUDIO_CD, 	SAA7146_EXCLUSIVE },	/* custom control */	
+	{ MXB_S_AUDIO_LINE, 	SAA7146_EXCLUSIVE },	/* custom control */	
+	{ 0,			0 }
+};
+
+struct mxb
+{
+	struct i2c_client*	saa7111a;
+	struct i2c_client*	tda9840;
+	struct i2c_client*	tea6415c;
+	struct i2c_client*	tuner;
+	struct i2c_client*	tea6420_1;
+	struct i2c_client*	tea6420_2;
+
+	int	cur_mode;	/* current audio mode (mono, stereo, ...) */
+	int	cur_input;	/* current input */
+	int	cur_freq;	/* current frequency the tuner is tuned to */
+	int	cur_mute;	/* current mute status */
+};
+
+/* this function gets called very early in the registration process of
+   the extension. it has been reported that some devices need to enable
+   the i2c-bus explicitly for example -- this can be done here. please
+   note, that you cannot be sure that the device is really the hardware
+   you expect, so you should do as little as possible in here, in order
+   to avoid confusing the hardware.
+*/
+static int mxb_preinit(struct saa7146_dev* dev)
+{
+	return 0;
+}
+
+static int mxb_probe(struct saa7146_dev* dev, unsigned int subvendor, unsigned int subdevice)
+{
+	struct mxb* mxb = 0;
+
+	int i = 0;	
+
+	mxb = (struct mxb*)kmalloc(sizeof(struct mxb), GFP_KERNEL);
+	if( NULL == mxb ) {
+		DEB_D(("not enough kernel memory.\n"));
+		return -ENOMEM;
+	}
+	memset(mxb, 0x0, sizeof(struct mxb));	
+
+	/* loop through all i2c-devices on the bus and look who is there */
+	for(i = 0; i < dev->i2c_adapter->client_count; i++) {
+		if( I2C_TEA6420_1 == dev->i2c_adapter->clients[i]->addr )
+			mxb->tea6420_1 = dev->i2c_adapter->clients[i];
+		if( I2C_TEA6420_2 == dev->i2c_adapter->clients[i]->addr ) 
+			mxb->tea6420_2 = dev->i2c_adapter->clients[i];
+		if( I2C_TEA6415C_2 == dev->i2c_adapter->clients[i]->addr ) 
+			mxb->tea6415c = dev->i2c_adapter->clients[i];
+		if( I2C_TDA9840 == dev->i2c_adapter->clients[i]->addr ) 
+			mxb->tda9840 = dev->i2c_adapter->clients[i];
+		if( I2C_SAA7111A == dev->i2c_adapter->clients[i]->addr ) 
+			mxb->saa7111a = dev->i2c_adapter->clients[i];
+		if( 0x60 == dev->i2c_adapter->clients[i]->addr ) 
+			mxb->tuner = dev->i2c_adapter->clients[i];
+	}
+
+	/* check if all devices are present */
+	if(    0 == mxb->tea6420_1	|| 0 == mxb->tea6420_2	|| 0 == mxb->tea6415c
+	    || 0 == mxb->tda9840	|| 0 == mxb->saa7111a	|| 0 == mxb->tuner ) {
+		DEB_D(("this saa7146 is not on an mxb.\n"));	
+		kfree(mxb);
+		return -ENODEV;
+	}
+
+	/* all devices are present, probe was successful */	
+
+	/* we store the pointer in our private data field */
+	(struct mxb*)dev->ext_priv = mxb;
+
+	return 0;
+}
+
+/* bring hardware to a sane state. this has to be done, just in case someone
+   wants to capture from this device before it has been properly initialized.
+   the capture engine would badly fail, because no valid signal arrives on the
+   saa7146, thus leading to timeouts and stuff. */
+static int mxb_init_done(struct saa7146_dev* dev)
+{
+	struct mxb* mxb = (struct mxb*)dev->ext_priv;
+	
+	struct {
+		int	length;
+		char	data[9];
+	} saa7740_init[] = {
+		{ 3, { 0x80, 0x00, 0x00 } },{ 3, { 0x80, 0x89, 0x00 } },
+		{ 3, { 0x80, 0xb0, 0x0a } },{ 3, { 0x00, 0x00, 0x00 } },
+		{ 3, { 0x49, 0x00, 0x00 } },{ 3, { 0x4a, 0x00, 0x00 } },
+		{ 3, { 0x4b, 0x00, 0x00 } },{ 3, { 0x4c, 0x00, 0x00 } },
+		{ 3, { 0x4d, 0x00, 0x00 } },{ 3, { 0x4e, 0x00, 0x00 } },
+		{ 3, { 0x4f, 0x00, 0x00 } },{ 3, { 0x50, 0x00, 0x00 } },
+		{ 3, { 0x51, 0x00, 0x00 } },{ 3, { 0x52, 0x00, 0x00 } },
+		{ 3, { 0x53, 0x00, 0x00 } },{ 3, { 0x54, 0x00, 0x00 } },
+		{ 3, { 0x55, 0x00, 0x00 } },{ 3, { 0x56, 0x00, 0x00 } },
+		{ 3, { 0x57, 0x00, 0x00 } },{ 3, { 0x58, 0x00, 0x00 } },
+		{ 3, { 0x59, 0x00, 0x00 } },{ 3, { 0x5a, 0x00, 0x00 } },
+		{ 3, { 0x5b, 0x00, 0x00 } },{ 3, { 0x5c, 0x00, 0x00 } },
+		{ 3, { 0x5d, 0x00, 0x00 } },{ 3, { 0x5e, 0x00, 0x00 } },
+		{ 3, { 0x5f, 0x00, 0x00 } },{ 3, { 0x60, 0x00, 0x00 } },
+		{ 3, { 0x61, 0x00, 0x00 } },{ 3, { 0x62, 0x00, 0x00 } },
+		{ 3, { 0x63, 0x00, 0x00 } },{ 3, { 0x64, 0x00, 0x00 } },
+		{ 3, { 0x65, 0x00, 0x00 } },{ 3, { 0x66, 0x00, 0x00 } },
+		{ 3, { 0x67, 0x00, 0x00 } },{ 3, { 0x68, 0x00, 0x00 } },
+		{ 3, { 0x69, 0x00, 0x00 } },{ 3, { 0x6a, 0x00, 0x00 } },
+		{ 3, { 0x6b, 0x00, 0x00 } },{ 3, { 0x6c, 0x00, 0x00 } },
+		{ 3, { 0x6d, 0x00, 0x00 } },{ 3, { 0x6e, 0x00, 0x00 } },
+		{ 3, { 0x6f, 0x00, 0x00 } },{ 3, { 0x70, 0x00, 0x00 } },
+		{ 3, { 0x71, 0x00, 0x00 } },{ 3, { 0x72, 0x00, 0x00 } },
+		{ 3, { 0x73, 0x00, 0x00 } },{ 3, { 0x74, 0x00, 0x00 } },
+		{ 3, { 0x75, 0x00, 0x00 } },{ 3, { 0x76, 0x00, 0x00 } },
+		{ 3, { 0x77, 0x00, 0x00 } },{ 3, { 0x41, 0x00, 0x42 } },
+		{ 3, { 0x42, 0x10, 0x42 } },{ 3, { 0x43, 0x20, 0x42 } },
+		{ 3, { 0x44, 0x30, 0x42 } },{ 3, { 0x45, 0x00, 0x01 } },
+		{ 3, { 0x46, 0x00, 0x01 } },{ 3, { 0x47, 0x00, 0x01 } },
+		{ 3, { 0x48, 0x00, 0x01 } },
+		{ 9, { 0x01, 0x03, 0xc5, 0x5c, 0x7a, 0x85, 0x01, 0x00, 0x54 } },
+		{ 9, { 0x21, 0x03, 0xc5, 0x5c, 0x7a, 0x85, 0x01, 0x00, 0x54 } },
+		{ 9, { 0x09, 0x0b, 0xb4, 0x6b, 0x74, 0x85, 0x95, 0x00, 0x34 } },
+		{ 9, { 0x29, 0x0b, 0xb4, 0x6b, 0x74, 0x85, 0x95, 0x00, 0x34 } },
+		{ 9, { 0x11, 0x17, 0x43, 0x62, 0x68, 0x89, 0xd1, 0xff, 0xb0 } },
+		{ 9, { 0x31, 0x17, 0x43, 0x62, 0x68, 0x89, 0xd1, 0xff, 0xb0 } },
+		{ 9, { 0x19, 0x20, 0x62, 0x51, 0x5a, 0x95, 0x19, 0x01, 0x50 } },
+		{ 9, { 0x39, 0x20, 0x62, 0x51, 0x5a, 0x95, 0x19, 0x01, 0x50 } },
+		{ 9, { 0x05, 0x3e, 0xd2, 0x69, 0x4e, 0x9a, 0x51, 0x00, 0xf0 } },
+		{ 9, { 0x25, 0x3e, 0xd2, 0x69, 0x4e, 0x9a, 0x51, 0x00, 0xf0 } },
+		{ 9, { 0x0d, 0x3d, 0xa1, 0x40, 0x7d, 0x9f, 0x29, 0xfe, 0x14 } },
+		{ 9, { 0x2d, 0x3d, 0xa1, 0x40, 0x7d, 0x9f, 0x29, 0xfe, 0x14 } },
+		{ 9, { 0x15, 0x73, 0xa1, 0x50, 0x5d, 0xa6, 0xf5, 0xfe, 0x38 } },
+		{ 9, { 0x35, 0x73, 0xa1, 0x50, 0x5d, 0xa6, 0xf5, 0xfe, 0x38 } },
+		{ 9, { 0x1d, 0xed, 0xd0, 0x68, 0x29, 0xb4, 0xe1, 0x00, 0xb8 } },
+		{ 9, { 0x3d, 0xed, 0xd0, 0x68, 0x29, 0xb4, 0xe1, 0x00, 0xb8 } },
+		{ 3, { 0x80, 0xb3, 0x0a } },
+		{-1, { 0} }
+	};
+	
+	unsigned char init[25] = {
+		0x00,
+		
+		0x00,	  /* 00 - ID byte */
+		0x00,	  /* 01 - reserved */
+
+		/*front end */
+		0xd8,	  /* 02 - FUSE=x, GUDL=x, MODE=x */
+		0x23,	  /* 03 - HLNRS=0, VBSL=1, WPOFF=0, HOLDG=0, GAFIX=0, GAI1=256, GAI2=256 */
+		0x00,	  /* 04 - GAI1=256 */
+		0x00,	  /* 05 - GAI2=256 */
+
+		/* decoder */
+		0xf0,	  /* 06 - HSB at  xx(50Hz) /  xx(60Hz) pixels after end of last line */
+		0x30,	  /* 07 - HSS at  xx(50Hz) /  xx(60Hz) pixels after end of last line */
+		0xa8,	  /* 08 - AUFD=x, FSEL=x, EXFIL=x, VTRC=x, HPLL=x, VNOI=x */
+		0x02,	  /* 09 - BYPS=x, PREF=x, BPSS=x, VBLB=x, UPTCV=x, APER=x */
+		0x80,	  /* 0a - BRIG=128 */
+		0x47,	  /* 0b - CONT=1.109 */
+		0x40,	  /* 0c - SATN=1.0 */
+		0x00,	  /* 0d - HUE=0 */
+		0x01,	  /* 0e - CDTO=0, CSTD=0, DCCF=0, FCTC=0, CHBW=1 */
+		0x00,	  /* 0f - reserved */
+		0xd0,	  /* 10 - OFTS=x, HDEL=x, VRLN=x, YDEL=x */
+		0x8c,	  /* 11 - GPSW=x, CM99=x, FECO=x, COMPO=x, OEYC=1, OEHV=1, VIPB=0, COLO=0 */
+		0x80,	  /* 12 - xx output control 2 */
+		0x30,	  /* 13 - xx output control 3 */
+		0x00,	  /* 14 - reserved */
+		0x15,	  /* 15 - VBI */
+		0x04,	  /* 16 - VBI */
+		0x00,	  /* 17 - VBI */
+	};
+
+	struct video_decoder_init saa7111a_init;
+	struct i2c_msg msg;
+
+	int i = 0, err = 0;
+	struct	tea6415c_video_multiplex vm;	
+
+	memcpy(&saa7111a_init.data, &init, sizeof(init));
+	saa7111a_init.count = sizeof(init);
+
+	/* write configuration to saa7111a */
+	mxb->saa7111a->driver->command(mxb->saa7111a, DECODER_INIT, &saa7111a_init);
+	/* select tuner-output on saa7111a */
+	i = 0;
+	mxb->saa7111a->driver->command(mxb->saa7111a,DECODER_SET_INPUT, &i);
+	i = VIDEO_MODE_PAL;
+	mxb->saa7111a->driver->command(mxb->saa7111a,DECODER_SET_NORM, &i);
+	
+	/* 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]);
+	mxb->tea6420_1->driver->command(mxb->tea6420_1,TEA6420_SWITCH, &TEA6420_cd[6][0]);
+	mxb->tea6420_2->driver->command(mxb->tea6420_2,TEA6420_SWITCH, &TEA6420_cd[6][1]);
+
+	/* switch to tuner-channel on tea6415c*/
+	vm.out = 17;
+	vm.in  = 3;
+	mxb->tea6415c->driver->command(mxb->tea6415c,TEA6415C_SWITCH, &vm);
+
+	/* select tuner-output on multicable on tea6415c*/
+	vm.in  = 3;
+	vm.out = 13;
+	mxb->tea6415c->driver->command(mxb->tea6415c,TEA6415C_SWITCH, &vm);
+
+							
+	/* tune in some frequency on tuner */
+	mxb->tuner->driver->command(mxb->tuner, VIDIOCSFREQ, &freq);
+
+	/* the rest for mxb */
+	mxb->cur_input = 0;
+	mxb->cur_freq = freq;
+	mxb->cur_mute = 1;
+
+	mxb->cur_mode = V4L2_TUNER_MODE_STEREO;
+	mxb->tda9840->driver->command(mxb->tda9840, TDA9840_SWITCH, &mxb->cur_mode);
+			
+	/* check if the saa7740 (aka 'sound arena module') is present
+	   on the mxb. if so, we must initialize it. due to lack of 
+	   informations about the saa7740, the values were reverse
+	   engineered. */
+	msg.addr = 0x1b;
+	msg.flags = 0;
+	msg.len = saa7740_init[0].length;
+	msg.buf = &saa7740_init[0].data[0];
+
+	if( 1 == (err = i2c_transfer(dev->i2c_adapter, &msg, 1))) {
+		for(i = 1;;i++) {
+			msg.len = saa7740_init[i].length;		
+			if( -1 == msg.len ) {
+				break;
+			}
+			msg.buf = &saa7740_init[i].data[0];
+			if( 1 != (err = i2c_transfer(dev->i2c_adapter, &msg, 1))) {
+				DEB_D(("failed to initialize 'sound arena module'.\n"));
+				goto err;
+			}
+		}
+		INFO(("'sound arena module' detected.\n"));
+	}
+err:	
+	/* the rest for saa7146: you should definitely set some basic values
+	   for the input-port handling of the saa7146. */
+
+	/* ext->saa has been filled by the core driver */
+	   
+	/* some stuff is done via variables */
+	saa7146_set_hps_source_and_sync(dev, input_port_selection[mxb->cur_input].hps_source, input_port_selection[mxb->cur_input].hps_sync);
+
+	/* some stuff is done via direct write to the registers */
+
+	/* this is ugly, but because of the fact that this is completely
+	   hardware dependend, it should be done directly... */
+      	saa7146_write(dev, DD1_STREAM_B,	0x00000000);
+	saa7146_write(dev, DD1_INIT,		0x02000200);
+	saa7146_write(dev, MC2, (MASK_09 | MASK_25 | MASK_10 | MASK_26));
+
+	return 0;
+}
+
+/* interrupt bh-handler. this gets called when irq_mask is != 0.
+   it must clear the interrupt-bits in irq_mask it has handled */
+/*
+void mxb_irq_bh(struct saa7146_dev* dev, u32* irq_mask)
+{
+	struct mxb* mxb = (struct mxb*)dev->ext_priv;
+}
+*/
+
+/* this function only gets called when the probing was successful */
+static int mxb_attach(struct saa7146_dev* dev)
+{
+	struct mxb* mxb = (struct mxb*)dev->ext_priv;
+	
+	/* checking for i2c-devices can be omitted here, because we
+	   already did this in "mxb_vl42_probe" */
+
+	mxb_num++;
+	
+	i2c_inc_use_client(mxb->tea6420_1);
+	i2c_inc_use_client(mxb->tea6420_2);
+	i2c_inc_use_client(mxb->tea6415c);
+	i2c_inc_use_client(mxb->tda9840);
+	i2c_inc_use_client(mxb->saa7111a);
+	i2c_inc_use_client(mxb->tuner);
+
+	return mxb_init_done(dev);
+}
+
+static int mxb_detach(struct saa7146_dev* dev)
+{
+	struct mxb* mxb = (struct mxb*)dev->ext_priv;
+
+	i2c_dec_use_client(mxb->tea6420_1);
+	i2c_dec_use_client(mxb->tea6420_2);
+	i2c_dec_use_client(mxb->tea6415c);
+	i2c_dec_use_client(mxb->tda9840);
+	i2c_dec_use_client(mxb->saa7111a);
+	i2c_dec_use_client(mxb->tuner);
+
+	mxb_num--;
+	kfree(mxb);
+
+	return 0;
+}
+
+static int mxb_vbi_bypass(struct saa7146_dev* dev)
+{
+	struct mxb* mxb = (struct mxb*)dev->ext_priv;
+	int i = 1;
+
+	/* switch bypass in saa7111a */
+	/* fixme saa
+	if ( 0 != mxb->saa7111a->driver->command(mxb->saa7111a,SAA711X_VBI_BYPASS, &i)) {
+		DEB_D(("could not address saa7111a.\n"));
+		return -1;
+	}			
+	*/
+	
+	return 0;
+}
+
+/* hack: this should go into saa711x */
+static int saa7111_set_gpio(struct saa7146_dev *dev, int bl)
+{
+	struct mxb* mxb = (struct mxb*)dev->ext_priv;
+
+	s32 byte = 0x0;
+	int result = 0;
+	
+	/* get the old register contents */
+	if ( -1 == (byte = i2c_smbus_read_byte_data(mxb->saa7111a, 0x11))) {
+		DEB_D(("could not read from saa711x\n"));
+		return -EFAULT;
+	}
+	
+	if( 0 == bl ) {
+		byte &= 0x7f;
+	} else {
+		byte |= 0x80;
+	}
+
+	/* write register contents back */
+	if ( 0 != (result = i2c_smbus_write_byte_data(mxb->saa7111a, 0x11, byte))) {
+		DEB_D(("could not write to saa711x\n"));
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static int mxb_ioctl(struct saa7146_dev *dev, unsigned int cmd, void *arg) 
+{
+	struct mxb* mxb = (struct mxb*)dev->ext_priv;
+
+	switch(cmd) {
+	case VIDIOC_ENUMINPUT:
+	{
+		struct v4l2_input *i = arg;
+		
+		DEB_EE(("VIDIOC_ENUMINPUT %d.\n",i->index));
+		if( i->index < 0 || i->index >= MXB_INPUTS) {
+			return -EINVAL;
+		}
+		memcpy(i, &mxb_inputs[i->index], sizeof(struct v4l2_input));
+
+		return 0;
+	}
+	/* the saa7146 provides some controls (brightness, contrast, saturation)
+	   which gets registered *after* this function. because of this we have
+	   to return with a value != 0 even if the function succeded.. */
+	case VIDIOC_QUERYCTRL:
+	{
+		struct v4l2_queryctrl *qc = arg;
+		int i;
+
+		for (i = MAXCONTROLS - 1; i >= 0; i--) {
+			if (mxb_controls[i].id == qc->id) {
+				*qc = mxb_controls[i];
+				DEB_D(("VIDIOC_QUERYCTRL %d.\n",qc->id));
+				return 0;
+			}
+		}
+		return -EAGAIN;
+	}
+	case VIDIOC_G_CTRL:
+	{
+		struct v4l2_control *vc = arg;
+		int i;
+
+		for (i = MAXCONTROLS - 1; i >= 0; i--) {
+			if (mxb_controls[i].id == vc->id) {
+				break;
+			}
+		}
+		
+		if( i < 0 ) {
+			return -EAGAIN;
+		}
+			
+		switch (vc->id ) {
+			case V4L2_CID_AUDIO_MUTE: {
+				vc->value = mxb->cur_mute;
+				DEB_D(("VIDIOC_G_CTRL V4L2_CID_AUDIO_MUTE:%d.\n",vc->value));
+				return 0;
+			}
+		}
+		
+		DEB_EE(("VIDIOC_G_CTRL V4L2_CID_AUDIO_MUTE:%d.\n",vc->value));
+		return 0;
+	}
+
+	case VIDIOC_S_CTRL:
+	{
+		struct	v4l2_control	*vc = arg;
+		int i = 0;
+		
+		for (i = MAXCONTROLS - 1; i >= 0; i--) {
+			if (mxb_controls[i].id == vc->id) {
+				break;
+			}
+		}
+		
+		if( i < 0 ) {
+			return -EAGAIN;
+		}
+		
+		switch (vc->id ) {
+			case V4L2_CID_AUDIO_MUTE: {
+				mxb->cur_mute = vc->value;
+				if( 0 == vc->value ) {
+					/* switch the audio-source */
+					mxb->tea6420_1->driver->command(mxb->tea6420_1,TEA6420_SWITCH, &TEA6420_line[video_audio_connect[mxb->cur_input]][0]);
+					mxb->tea6420_2->driver->command(mxb->tea6420_2,TEA6420_SWITCH, &TEA6420_line[video_audio_connect[mxb->cur_input]][1]);
+				} else {
+					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]);
+				}
+				DEB_EE(("VIDIOC_S_CTRL, V4L2_CID_AUDIO_MUTE: %d.\n",vc->value));
+				break;
+			}
+		}
+		return 0;
+	}
+	case VIDIOC_G_INPUT:
+	{
+		int *input = (int *)arg;
+		*input = mxb->cur_input;
+
+		DEB_EE(("VIDIOC_G_INPUT %d.\n",*input));
+		return 0;		
+	}	
+	case VIDIOC_S_INPUT:
+	{
+		int input = *(int *)arg;
+		struct	tea6415c_video_multiplex vm;	
+		int i = 0;
+
+		DEB_EE(("VIDIOC_S_INPUT %d.\n",input));
+
+		if (input < 0 || input >= MXB_INPUTS) {
+			return -EINVAL;
+		}
+		
+		/* fixme: locke das setzen des inputs mit hilfe des mutexes
+		down(&dev->lock);
+		video_mux(dev,*i);
+		up(&dev->lock);
+		*/
+				
+		/* fixme: check if streaming capture
+		if ( 0 != dev->streaming ) {
+			DEB_D(("VIDIOC_S_INPUT illegal while streaming.\n"));
+			return -EPERM;
+		}
+		*/
+		
+		mxb->cur_input = input;
+	
+		saa7146_set_hps_source_and_sync(dev, input_port_selection[input].hps_source, input_port_selection[input].hps_sync);
+		
+		/* prepare switching of tea6415c and saa7111a;
+		   have a look at the 'background'-file for further informations  */
+		switch( input ) {
+			
+			case TUNER:
+			{
+				i = 0;
+				vm.in  = 3;
+				vm.out = 17;
+								
+			if ( 0 != mxb->tea6415c->driver->command(mxb->tea6415c,TEA6415C_SWITCH, &vm)) {
+					printk("VIDIOC_S_INPUT: could not address tea6415c #1\n");
+					return -EFAULT;
+				}
+				/* connect tuner-output always to multicable */
+				vm.in  = 3;
+				vm.out = 13;
+				break;				
+			}
+			case AUX3_YC:
+			{
+				/* nothing to be done here. aux3_yc is
+				   directly connected to the saa711a */
+				i = 5;
+				break;
+			}
+			case AUX3:
+			{
+				/* nothing to be done here. aux3 is
+				   directly connected to the saa711a */
+				i = 1;
+				break;
+			}
+			case AUX1:
+			{
+				i = 0;
+				vm.in  = 1;
+				vm.out = 17;
+				break;
+			}
+		}
+
+		/* switch video in tea6415c only if necessary */
+		switch( input ) {
+			case TUNER:
+			case AUX1:
+			{
+				if ( 0 != mxb->tea6415c->driver->command(mxb->tea6415c,TEA6415C_SWITCH, &vm)) {
+					printk("VIDIOC_S_INPUT: could not address tea6415c #3\n");
+					return -EFAULT;
+				}
+				break;
+			}
+			default:
+			{
+				break;
+			}
+		}
+				
+		/* switch video in saa7111a */
+		if ( 0 != mxb->saa7111a->driver->command(mxb->saa7111a,DECODER_SET_INPUT, &i)) {
+			printk("VIDIOC_S_INPUT: could not address saa7111a #1.\n");
+		}			
+
+		/* switch the audio-source only if necessary */
+		if( 0 == mxb->cur_mute ) {
+			mxb->tea6420_1->driver->command(mxb->tea6420_1,TEA6420_SWITCH, &TEA6420_line[video_audio_connect[input]][0]);
+			mxb->tea6420_2->driver->command(mxb->tea6420_2,TEA6420_SWITCH, &TEA6420_line[video_audio_connect[input]][1]);
+		}
+
+		return 0;
+	}
+	case VIDIOC_G_TUNER:
+	{
+		struct v4l2_tuner *t = arg;
+		int byte = 0;
+
+		if( 0 != t->index ) {
+			DEB_D(("VIDIOC_G_TUNER: channel %d does not have a tuner attached.\n", t->index));
+			return -EINVAL;
+		}
+
+		DEB_EE(("VIDIOC_G_TUNER: %d\n", t->index));
+
+		memset(t,0,sizeof(*t));
+		strcpy(t->name, "Television");
+
+		t->type = V4L2_TUNER_ANALOG_TV;
+		/* fixme: _CAP_NORM needed? */
+		t->capability = V4L2_TUNER_CAP_NORM | V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2 | V4L2_TUNER_CAP_SAP;
+		t->rangelow = 772;	/* 48.25 MHZ / 62.5 kHz = 772, see fi1216mk2-specs, page 2 */
+		t->rangehigh = 13684;	/* 855.25 MHz / 62.5 kHz = 13684 */
+		/* fixme: add the real signal strength here */
+		t->signal = 0xffff;
+		t->afc = 0;		
+
+		byte = mxb->tda9840->driver->command(mxb->tda9840,TDA9840_DETECT, NULL);
+		t->audmode = mxb->cur_mode;
+		
+		if( byte < 0 ) {
+			t->rxsubchans  = V4L2_TUNER_SUB_MONO;
+		} else {
+			switch(byte) {
+				case TDA9840_MONO_DETECT: {
+					t->rxsubchans 	= V4L2_TUNER_SUB_MONO;
+					DEB_D(("VIDIOC_G_TUNER: V4L2_TUNER_MODE_MONO.\n"));
+					break;
+				}
+				case TDA9840_DUAL_DETECT: {
+					t->rxsubchans 	= V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
+					DEB_D(("VIDIOC_G_TUNER: V4L2_TUNER_MODE_LANG1.\n"));
+					break;
+				}
+				case TDA9840_STEREO_DETECT: {
+					t->rxsubchans 	= V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
+					DEB_D(("VIDIOC_G_TUNER: V4L2_TUNER_MODE_STEREO.\n"));
+					break;
+				}
+				default: { /* TDA9840_INCORRECT_DETECT */
+					t->rxsubchans 	= V4L2_TUNER_MODE_MONO;
+					DEB_D(("VIDIOC_G_TUNER: TDA9840_INCORRECT_DETECT => V4L2_TUNER_MODE_MONO\n"));
+					break;
+				}
+			}
+		}
+
+		return 0;
+	}
+	case VIDIOC_S_TUNER:
+	{
+		struct v4l2_tuner *t = arg;
+		int result = 0;
+		int byte = 0;
+		
+		if( 0 != t->index ) {
+			DEB_D(("VIDIOC_S_TUNER: channel %d does not have a tuner attached.\n",t->index));
+			return -EINVAL;
+		}
+	
+		switch(t->audmode) {
+			case V4L2_TUNER_MODE_STEREO: {
+				mxb->cur_mode = V4L2_TUNER_MODE_STEREO;
+				byte = TDA9840_SET_STEREO;
+				DEB_D(("VIDIOC_S_TUNER: V4L2_TUNER_MODE_STEREO\n"));
+				break;
+			}
+			case V4L2_TUNER_MODE_LANG1: {
+				mxb->cur_mode = V4L2_TUNER_MODE_LANG1;
+				byte = TDA9840_SET_LANG1;
+				DEB_D(("VIDIOC_S_TUNER: V4L2_TUNER_MODE_LANG1\n"));
+				break;
+			}
+			case V4L2_TUNER_MODE_LANG2: {
+				mxb->cur_mode = V4L2_TUNER_MODE_LANG2;
+				byte = TDA9840_SET_LANG2;
+				DEB_D(("VIDIOC_S_TUNER: V4L2_TUNER_MODE_LANG2\n"));
+				break;
+			}
+			default: { /* case V4L2_TUNER_MODE_MONO: {*/
+				mxb->cur_mode = V4L2_TUNER_MODE_MONO;
+				byte = TDA9840_SET_MONO;
+				DEB_D(("VIDIOC_S_TUNER: TDA9840_SET_MONO\n"));
+				break;
+			}
+		}
+
+		if( 0 != (result = mxb->tda9840->driver->command(mxb->tda9840, TDA9840_SWITCH, &byte))) {
+			printk("VIDIOC_S_TUNER error. result:%d, byte:%d\n",result,byte);
+		}
+				
+		return 0;
+	}
+	case VIDIOC_G_FREQUENCY:
+	{
+		struct v4l2_frequency *f = arg;
+
+		if(0 != mxb->cur_input) {
+			DEB_D(("VIDIOC_G_FREQ: channel %d does not have a tuner!\n",mxb->cur_input));
+			return -EINVAL;
+		}
+
+		memset(f,0,sizeof(*f));
+		f->type = V4L2_TUNER_ANALOG_TV;
+		f->frequency =  mxb->cur_freq;
+
+		DEB_EE(("VIDIOC_G_FREQ: freq:0x%08x.\n", mxb->cur_freq));
+		return 0;
+	}
+	case VIDIOC_S_FREQUENCY:
+	{
+		struct v4l2_frequency *f = arg;
+		int t_locked = 0;
+		int v_byte = 0;
+
+		if (0 != f->tuner)
+			return -EINVAL;
+
+		if (V4L2_TUNER_ANALOG_TV != f->type)
+			return -EINVAL;
+		
+		if(0 != mxb->cur_input) {
+			DEB_D(("VIDIOC_S_FREQ: channel %d does not have a tuner!\n",mxb->cur_input));
+			return -EINVAL;
+		}
+
+		DEB_EE(("VIDIOC_S_FREQUENCY: freq:0x%08x.\n",f->frequency));
+
+		mxb->cur_freq = f->frequency;
+
+		/* tune in desired frequency */			
+		mxb->tuner->driver->command(mxb->tuner, VIDIOCSFREQ, &mxb->cur_freq);
+
+		/* check if pll of tuner & saa7111a is locked */
+//		mxb->tuner->driver->command(mxb->tuner,TUNER_IS_LOCKED, &t_locked);
+		mxb->saa7111a->driver->command(mxb->saa7111a,DECODER_GET_STATUS, &v_byte);
+
+		/* not locked -- anything to do here ? */
+		if( 0 == t_locked || 0 == (v_byte & DECODER_STATUS_GOOD)) {
+		}
+
+		/* hack: changing the frequency should invalidate the vbi-counter (=> alevt) */
+		spin_lock(&dev->slock);
+		dev->vbi_fieldcount = 0;
+		spin_unlock(&dev->slock);
+
+		return 0;
+	}
+	case MXB_S_AUDIO_CD:
+	{
+		int i = *(int*)arg;
+				
+		if( i < 0 || i >= MXB_AUDIOS ) {
+			DEB_D(("illegal argument to MXB_S_AUDIO_CD: i:%d.\n",i));
+			return -EINVAL;
+		}
+		
+		DEB_EE(("MXB_S_AUDIO_CD: i:%d.\n",i));
+
+		mxb->tea6420_1->driver->command(mxb->tea6420_1,TEA6420_SWITCH, &TEA6420_cd[i][0]);
+		mxb->tea6420_2->driver->command(mxb->tea6420_2,TEA6420_SWITCH, &TEA6420_cd[i][1]);
+
+		return 0;
+	}
+	case MXB_S_AUDIO_LINE:
+	{
+		int i = *(int*)arg;
+				
+		if( i < 0 || i >= MXB_AUDIOS ) {
+			DEB_D(("illegal argument to MXB_S_AUDIO_LINE: i:%d.\n",i));
+			return -EINVAL;
+		}
+		
+		DEB_EE(("MXB_S_AUDIO_LINE: i:%d.\n",i));
+		mxb->tea6420_1->driver->command(mxb->tea6420_1,TEA6420_SWITCH, &TEA6420_line[i][0]);
+		mxb->tea6420_2->driver->command(mxb->tea6420_2,TEA6420_SWITCH, &TEA6420_line[i][1]);
+
+		return 0;
+	}
+	case VIDIOC_G_AUDIO:
+	{
+		struct v4l2_audio *a = arg;
+
+		if( a->index < 0 || a->index > MXB_INPUTS ) {
+	 		DEB_D(("VIDIOC_G_AUDIO %d out of range.\n",a->index));
+			return -EINVAL;
+		}
+		
+ 		DEB_EE(("VIDIOC_G_AUDIO %d.\n",a->index));
+		memcpy(a, &mxb_audios[video_audio_connect[mxb->cur_input]], sizeof(struct v4l2_audio));
+		
+		return 0;
+	}
+	case VIDIOC_S_AUDIO:
+	{
+		struct v4l2_audio *a = arg;
+		DEB_D(("VIDIOC_S_AUDIO %d.\n",a->index));
+		return 0;
+	}	
+	default:
+/*
+		DEB2(printk("does not handle this ioctl.\n"));
+*/
+		return -ENOIOCTLCMD;
+	}
+	return 0;
+}
+
+static int std_callback(struct saa7146_dev* dev, struct saa7146_standard *std)
+{
+	if(V4L2_STD_PAL_I == std->id ) {
+		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 */
+		saa7111_set_gpio(dev,0);
+	} else {
+		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 */
+		saa7111_set_gpio(dev,1);
+	}
+	return 0;
+}
+
+static struct saa7146_standard standard[] = {
+	{ "PAL-BG",	V4L2_STD_PAL_BG,	SAA7146_PAL_VALUES },
+	{ "PAL-I",	V4L2_STD_PAL_I,		SAA7146_PAL_VALUES },
+	{ "NTSC",	V4L2_STD_NTSC,		SAA7146_NTSC_VALUES },
+	{ "SECAM", 	V4L2_STD_SECAM,		SAA7146_SECAM_VALUES },
+};
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,51)
+static void mxb_inc_use(struct saa7146_dev *dev)
+{
+	MOD_INC_USE_COUNT;
+}
+
+static void mxb_dec_use(struct saa7146_dev *dev)
+{
+	MOD_DEC_USE_COUNT;
+}
+#endif
+
+static struct saa7146_sub_info sub_data[] = {
+	{ 0x0000, 0x0000 },
+	{ 0xffff, 0xffff },
+};
+
+static struct saa7146_extension extension = {
+	MXB_IDENTIFIER,
+	MXB_INPUTS,
+	MXB_AUDIOS,
+	V4L2_CAP_TUNER,
+	
+	sub_data,
+	
+	THIS_MODULE,
+	
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,51)
+	mxb_inc_use,
+	mxb_dec_use,
+#endif
+	
+	&standard[0],
+	sizeof(standard)/sizeof(struct saa7146_standard),
+	&std_callback, 
+	
+	1,
+	mxb_vbi_bypass,
+
+	&ioctls[0],
+
+	mxb_preinit,
+	mxb_probe,
+	mxb_attach,
+	mxb_detach,
+
+	mxb_ioctl,
+	
+	0,
+	NULL,
+};
+
+static int mxb_init(void)
+{
+	if( 0 != saa7146_register_extension(&extension)) {
+		DEB_S(("failed to register extension.\n"));
+		return -ENODEV;
+	}
+
+	/* mxb_num gets increased if the probe function is called successfully */
+
+	if( 0 == mxb_num ) {
+		INFO(("no mxb(s) found.\n"));
+		return -ENODEV;
+	}
+
+	INFO(("%d mxb(s) found.\n", mxb_num));
+	return 0;
+}
+
+#ifdef MODULE
+MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
+MODULE_DESCRIPTION("video4linux driver for the Siemens-Nixdorf 'Multimedia eXtension board'");
+MODULE_LICENSE("GPL");
+
+EXPORT_NO_SYMBOLS;
+
+static int mxb_init_module(void) 
+{
+	return mxb_init();
+}
+
+static void mxb_cleanup_module(void) 
+{
+	saa7146_unregister_extension(&extension);
+}
+
+module_init(mxb_init_module);
+module_exit(mxb_cleanup_module);
+#endif