saa7134-tvaudio.c

电脑主机的PCI电视卡的源代码

/*
 * device driver for philips saa7134 based TV cards
 * tv audio decoder (fm stereo, nicam, ...)
 *
 * (c) 2001-03 Gerd Knorr <[e-mail]> [SuSE Labs]
 *
 *  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 <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/smp_lock.h>
#include <asm/div64.h>

#include "saa7134-reg.h"
#include "saa7134.h"

/* ------------------------------------------------------------------ */

static unsigned int audio_debug = 0;
MODULE_PARM(audio_debug,"i");
MODULE_PARM_DESC(audio_debug,"enable debug messages [tv audio]");

static unsigned int audio_carrier = 0;
MODULE_PARM(audio_carrier,"i");
MODULE_PARM_DESC(audio_carrier,"audio carrier location");

#define dprintk(fmt, arg...)	if (audio_debug) \
	printk(KERN_DEBUG "%s/audio: " fmt, dev->name , ## arg)
#define d2printk(fmt, arg...)	if (audio_debug > 1) \
	printk(KERN_DEBUG "%s/audio: " fmt, dev->name, ## arg)

#define print_regb(reg) printk("%s:   reg 0x%03x [%-16s]: 0x%02x\n", \
		dev->name,(SAA7134_##reg),(#reg),saa_readb((SAA7134_##reg)))

#define SCAN_INITIAL_DELAY  (HZ)
#define SCAN_SAMPLE_DELAY   (HZ/5)

/* ------------------------------------------------------------------ */
/* saa7134 code                                                       */

static struct saa7134_tvaudio tvaudio[] = {
	{
		.name          = "PAL-B/G FM-stereo",
		.std           = V4L2_STD_PAL,
		.mode          = TVAUDIO_FM_BG_STEREO,
		.carr1         = 5500,
		.carr2         = 5742,
	},{
		.name          = "PAL-D/K1 FM-stereo",
		.std           = V4L2_STD_PAL,
		.carr1         = 6500,
		.carr2         = 6258,
		.mode          = TVAUDIO_FM_BG_STEREO,
	},{
		.name          = "PAL-D/K2 FM-stereo",
		.std           = V4L2_STD_PAL,
		.carr1         = 6500,
		.carr2         = 6742,
		.mode          = TVAUDIO_FM_BG_STEREO,
	},{
		.name          = "PAL-D/K3 FM-stereo",
		.std           = V4L2_STD_PAL,
		.carr1         = 6500,
		.carr2         = 5742,
		.mode          = TVAUDIO_FM_BG_STEREO,
	},{
		.name          = "PAL-B/G NICAM",
		.std           = V4L2_STD_PAL,
		.carr1         = 5500,
		.carr2         = 5850,
		.mode          = TVAUDIO_NICAM_FM,
	},{
		.name          = "PAL-I NICAM",
		.std           = V4L2_STD_PAL,
		.carr1         = 6000,
		.carr2         = 6552,
		.mode          = TVAUDIO_NICAM_FM,
	},{
		.name          = "PAL-D/K NICAM",
		.std           = V4L2_STD_PAL,
		.carr1         = 6500,
		.carr2         = 5850,
		.mode          = TVAUDIO_NICAM_FM,
	},{
		.name          = "SECAM-L NICAM",
		.std           = V4L2_STD_SECAM,
		.carr1         = 6500,
		.carr2         = 5850,
		.mode          = TVAUDIO_NICAM_AM,
	},{
		.name          = "SECAM-D/K",
		.std           = V4L2_STD_SECAM,
		.carr1         = 6500,
		.carr2         = -1,
		.mode          = TVAUDIO_FM_MONO,
	},{
		.name          = "NTSC-M",
		.std           = V4L2_STD_NTSC,
		.carr1         = 4500,
		.carr2         = -1,
		.mode          = TVAUDIO_FM_MONO,
	},{
		.name          = "NTSC-A2 FM-stereo",
		.std           = V4L2_STD_NTSC,
		.carr1         = 4500,
		.carr2         = 4724,
		.mode          = TVAUDIO_FM_K_STEREO,
	}
};
#define TVAUDIO (sizeof(tvaudio)/sizeof(struct saa7134_tvaudio))

/* ------------------------------------------------------------------ */

static void tvaudio_init(struct saa7134_dev *dev)
{
	int clock = saa7134_boards[dev->board].audio_clock;

	/* init all audio registers */
	saa_writeb(SAA7134_AUDIO_PLL_CTRL,   0x00);
	if (need_resched())
		schedule();
	else
		udelay(10);

	saa_writeb(SAA7134_AUDIO_CLOCK0,      clock        & 0xff);
	saa_writeb(SAA7134_AUDIO_CLOCK1,     (clock >>  8) & 0xff);
	saa_writeb(SAA7134_AUDIO_CLOCK2,     (clock >> 16) & 0xff);
	saa_writeb(SAA7134_AUDIO_PLL_CTRL,   0x01);

	saa_writeb(SAA7134_NICAM_ERROR_LOW,  0x14);
	saa_writeb(SAA7134_NICAM_ERROR_HIGH, 0x50);
	saa_writeb(SAA7134_MONITOR_SELECT,   0xa0);
	saa_writeb(SAA7134_FM_DEMATRIX,      0x80);
}

static u32 tvaudio_carr2reg(u32 carrier)
{
	u64 a = carrier;

	a <<= 24;
	do_div(a,12288);
	return a;
}

static void tvaudio_setcarrier(struct saa7134_dev *dev,
			       int primary, int secondary)
{
	if (-1 == secondary)
		secondary = primary;
	saa_writel(SAA7134_CARRIER1_FREQ0 >> 2, tvaudio_carr2reg(primary));
	saa_writel(SAA7134_CARRIER2_FREQ0 >> 2, tvaudio_carr2reg(secondary));
}

static void mute_input_7134(struct saa7134_dev *dev)
{
	unsigned int mute;
	struct saa7134_input *in;
	int ausel=0, ics=0, ocs=0;
	int mask;

	/* look what is to do ... */
	in   = dev->input;
	mute = (dev->ctl_mute ||
		(dev->automute  &&  (&card(dev).radio) != in));
	if (PCI_DEVICE_ID_PHILIPS_SAA7130 == dev->pci->device &&
	    card(dev).mute.name) {
		/* 7130 - we'll mute using some unconnected audio input */
		if (mute)
			in = &card(dev).mute;
	}
	if (dev->hw_mute  == mute &&
	    dev->hw_input == in)
		return;

	dprintk("ctl_mute=%d automute=%d input=%s  =>  mute=%d input=%s\n",
		dev->ctl_mute,dev->automute,dev->input->name,mute,in->name);
	dev->hw_mute  = mute;
	dev->hw_input = in;

	if (PCI_DEVICE_ID_PHILIPS_SAA7134 == dev->pci->device)
		/* 7134 mute */
		saa_writeb(SAA7134_AUDIO_MUTE_CTRL, mute ? 0xff : 0xbb);

	/* switch internal audio mux */
	switch (in->amux) {
	case TV:    ausel=0xc0; ics=0x00; ocs=0x02; break;
	case LINE1: ausel=0x80; ics=0x00; ocs=0x00; break;
	case LINE2: ausel=0x80; ics=0x08; ocs=0x01; break;
	}
	saa_andorb(SAA7134_AUDIO_FORMAT_CTRL, 0xc0, ausel);
	saa_andorb(SAA7134_ANALOG_IO_SELECT, 0x08, ics);
	saa_andorb(SAA7134_ANALOG_IO_SELECT, 0x07, ocs);

	/* switch gpio-connected external audio mux */
	if (0 == card(dev).gpiomask)
		return;
	mask = card(dev).gpiomask;
	saa_andorl(SAA7134_GPIO_GPMODE0 >> 2,   mask, mask);
	saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, mask, in->gpio);
	saa7134_track_gpio(dev,in->name);
}

static void tvaudio_setmode(struct saa7134_dev *dev,
			    struct saa7134_tvaudio *audio,
			    char *note)
{
	if (note)
		dprintk("tvaudio_setmode: %s %s [%d.%03d/%d.%03d MHz]\n",
			note,audio->name,
			audio->carr1 / 1000, audio->carr1 % 1000,
			audio->carr2 / 1000, audio->carr2 % 1000);

	if (dev->tvnorm->id == V4L2_STD_NTSC) {
		saa_writeb(SAA7134_AUDIO_CLOCKS_PER_FIELD0, 0xde);
		saa_writeb(SAA7134_AUDIO_CLOCKS_PER_FIELD1, 0x15);
		saa_writeb(SAA7134_AUDIO_CLOCKS_PER_FIELD2, 0x02);
	} else {
		saa_writeb(SAA7134_AUDIO_CLOCKS_PER_FIELD0, 0x00);
		saa_writeb(SAA7134_AUDIO_CLOCKS_PER_FIELD1, 0x80);
		saa_writeb(SAA7134_AUDIO_CLOCKS_PER_FIELD2, 0x02);
	}
	tvaudio_setcarrier(dev,audio->carr1,audio->carr2);
	
	switch (audio->mode) {
	case TVAUDIO_FM_MONO:
	case TVAUDIO_FM_BG_STEREO:
		saa_writeb(SAA7134_DEMODULATOR,               0x00);
		saa_writeb(SAA7134_DCXO_IDENT_CTRL,           0x00);
		saa_writeb(SAA7134_FM_DEEMPHASIS,             0x22);
		saa_writeb(SAA7134_FM_DEMATRIX,               0x80);
		saa_writeb(SAA7134_STEREO_DAC_OUTPUT_SELECT,  0xa0);
		break;
	case TVAUDIO_FM_K_STEREO:
		saa_writeb(SAA7134_DEMODULATOR,               0x00);
		saa_writeb(SAA7134_DCXO_IDENT_CTRL,           0x01);
		saa_writeb(SAA7134_FM_DEEMPHASIS,             0x22);
		saa_writeb(SAA7134_FM_DEMATRIX,               0x80);
		saa_writeb(SAA7134_STEREO_DAC_OUTPUT_SELECT,  0xa0);
		break;
	case TVAUDIO_NICAM_FM:
		saa_writeb(SAA7134_DEMODULATOR,               0x10);
		saa_writeb(SAA7134_DCXO_IDENT_CTRL,           0x00);
		saa_writeb(SAA7134_FM_DEEMPHASIS,             0x44);
		saa_writeb(SAA7134_STEREO_DAC_OUTPUT_SELECT,  0xa1);
		saa_writeb(SAA7134_NICAM_CONFIG,              0x00);
		break;
	case TVAUDIO_NICAM_AM:
		saa_writeb(SAA7134_DEMODULATOR,               0x12);
		saa_writeb(SAA7134_DCXO_IDENT_CTRL,           0x00);
		saa_writeb(SAA7134_FM_DEEMPHASIS,             0x44);
		saa_writeb(SAA7134_STEREO_DAC_OUTPUT_SELECT,  0xa1);
		saa_writeb(SAA7134_NICAM_CONFIG,              0x00);
		break;
	case TVAUDIO_FM_SAT_STEREO:
		/* not implemented (yet) */
		break;
	}
	saa_writel(0x174 >> 2, 0x0001e000); /* FIXME */
}

static int tvaudio_sleep(struct saa7134_dev *dev, int timeout)
{
	DECLARE_WAITQUEUE(wait, current);
	
	add_wait_queue(&dev->thread.wq, &wait);
	set_current_state(TASK_INTERRUPTIBLE);
	schedule_timeout(timeout);
	remove_wait_queue(&dev->thread.wq, &wait);
	return dev->thread.scan1 != dev->thread.scan2;
}

static int tvaudio_checkcarrier(struct saa7134_dev *dev, int carrier)
{
	__s32 left,right,value;

	if (audio_debug > 1) {
		int i;
		dprintk("debug %d:",carrier);
		for (i = -150; i <= 150; i += 30) {
			tvaudio_setcarrier(dev,carrier+i,carrier+i);
			saa_readl(SAA7134_LEVEL_READOUT1 >> 2);
			if (tvaudio_sleep(dev,SCAN_SAMPLE_DELAY))
				return -1;
			value = saa_readl(SAA7134_LEVEL_READOUT1 >> 2);
			if (0 == i)
				printk("  #  %6d  # ",value >> 16);
			else
				printk(" %6d",value >> 16);
		}
		printk("\n");
	}
	
	tvaudio_setcarrier(dev,carrier-90,carrier-90);
	saa_readl(SAA7134_LEVEL_READOUT1 >> 2);
	if (tvaudio_sleep(dev,SCAN_SAMPLE_DELAY))
		return -1;
	left = saa_readl(SAA7134_LEVEL_READOUT1 >> 2);

	tvaudio_setcarrier(dev,carrier+90,carrier+90);
	saa_readl(SAA7134_LEVEL_READOUT1 >> 2);
	if (tvaudio_sleep(dev,SCAN_SAMPLE_DELAY))
		return -1;
	right = saa_readl(SAA7134_LEVEL_READOUT1 >> 2);

	left >>= 16;
        right >>= 16;
	value = left > right ? left - right : right - left;
	dprintk("scanning %d.%03d MHz =>  dc is %5d [%d/%d]\n",
		carrier/1000,carrier%1000,value,left,right);
	return value;
}

#if 0
static void sifdebug_dump_regs(struct saa7134_dev *dev)
{
	print_regb(AUDIO_STATUS);
	print_regb(IDENT_SIF);
	print_regb(LEVEL_READOUT1);
	print_regb(LEVEL_READOUT2);
	print_regb(DCXO_IDENT_CTRL);
	print_regb(DEMODULATOR);
	print_regb(AGC_GAIN_SELECT);
	print_regb(MONITOR_SELECT);
	print_regb(FM_DEEMPHASIS);
	print_regb(FM_DEMATRIX);
	print_regb(SIF_SAMPLE_FREQ);
	print_regb(ANALOG_IO_SELECT);
}
#endif

static int tvaudio_getstereo(struct saa7134_dev *dev, struct saa7134_tvaudio *audio)
{
	__u32 idp,nicam;
	int retval = -1;
	
	switch (audio->mode) {
	case TVAUDIO_FM_MONO:
		return V4L2_TUNER_SUB_MONO;
	case TVAUDIO_FM_K_STEREO:
	case TVAUDIO_FM_BG_STEREO:
		idp = (saa_readb(SAA7134_IDENT_SIF) & 0xe0) >> 5;
		if (0x03 == (idp & 0x03))
			retval = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
		else if (0x05 == (idp & 0x05))
			retval = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
		else if (0x01 == (idp & 0x01))
			retval = V4L2_TUNER_SUB_MONO;
		break;
	case TVAUDIO_FM_SAT_STEREO:
		/* not implemented (yet) */
		break;
	case TVAUDIO_NICAM_FM:
	case TVAUDIO_NICAM_AM:
		nicam = saa_readb(SAA7134_NICAM_STATUS);
		switch (nicam & 0x0b) {
		case 0x08:
			retval = V4L2_TUNER_SUB_MONO;
			break;
		case 0x09:
			retval = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
			break;
		case 0x0a:
			retval = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
			break;
		}
		break;
	}
	if (retval != -1)
		dprintk("found audio subchannels:%s%s%s%s\n",
			(retval & V4L2_TUNER_SUB_MONO)   ? " mono"   : "",
			(retval & V4L2_TUNER_SUB_STEREO) ? " stereo" : "",
			(retval & V4L2_TUNER_SUB_LANG1)  ? " lang1"  : "",
			(retval & V4L2_TUNER_SUB_LANG2)  ? " lang2"  : "");
	return retval;
}

static int tvaudio_setstereo(struct saa7134_dev *dev, struct saa7134_tvaudio *audio,
			     u32 mode)
{
	static char *name[] = {
		[ V4L2_TUNER_MODE_MONO   ] = "mono",
		[ V4L2_TUNER_MODE_STEREO ] = "stereo",
		[ V4L2_TUNER_MODE_LANG1  ] = "lang1",
		[ V4L2_TUNER_MODE_LANG2  ] = "lang2",
	};
	static u32 fm[] = {
		[ V4L2_TUNER_MODE_MONO   ] = 0x00,  /* ch1  */
		[ V4L2_TUNER_MODE_STEREO ] = 0x80,  /* auto */
		[ V4L2_TUNER_MODE_LANG1  ] = 0x00,  /* ch1  */
		[ V4L2_TUNER_MODE_LANG2  ] = 0x01,  /* ch2  */
	};
	u32 reg;

	switch (audio->mode) {
	case TVAUDIO_FM_MONO:
		/* nothing to do ... */
		break;
	case TVAUDIO_FM_K_STEREO:
	case TVAUDIO_FM_BG_STEREO:
		dprintk("setstereo [fm] => %s\n",
			name[ mode % ARRAY_SIZE(name) ]);
		reg = fm[ mode % ARRAY_SIZE(fm) ];
		saa_writeb(SAA7134_FM_DEMATRIX, reg);
		break;
	case TVAUDIO_FM_SAT_STEREO:
	case TVAUDIO_NICAM_AM:
	case TVAUDIO_NICAM_FM:
		/* FIXME */
		break;
	}
	return 0;
}

static int tvaudio_thread(void *data)
{
#define MAX_SCAN 4
	static const int carr_pal[MAX_SCAN]     = { 5500, 6000, 6500 };
	static const int carr_ntsc[MAX_SCAN]    = { 4500 };
	static const int carr_secam[MAX_SCAN]   = { 6500 };
	static const int carr_default[MAX_SCAN] = { 4500, 5500, 6000, 6500 };
	struct saa7134_dev *dev = data;
	const int *carr_scan;
	int carr_vals[4];
	unsigned int i, audio;
	int max1,max2,carrier,rx,mode;

	lock_kernel();
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,61)
	daemonize();
	sigfillset(&current->blocked);
	sprintf(current->comm, "%s", dev->name);
#else
	daemonize("%s", dev->name);
#endif
	dev->thread.task = current;
	unlock_kernel();
	if (dev->thread.notify != NULL)
		up(dev->thread.notify);

	for (;;) {
		if (dev->thread.exit || signal_pending(current))
			goto done;
		interruptible_sleep_on(&dev->thread.wq);
		if (dev->thread.exit || signal_pending(current))
			goto done;

	restart:
		dev->thread.scan1 = dev->thread.scan2;
		dprintk("tvaudio thread scan start [%d]\n",dev->thread.scan1);
		dev->tvaudio  = NULL;
		tvaudio_init(dev);
		dev->automute = 1;
		mute_input_7134(dev);

		/* give the tuner some time */
		if (tvaudio_sleep(dev,SCAN_INITIAL_DELAY))
			goto restart;