msp3400.c

该代码是天敏电视卡天敏大师4的核心芯片在linux下面的驱动

		break;
	case MSP_MODE_EXTERN:
		dprintk(KERN_DEBUG "msp3400: extern setstereo: %s\n",strmode[mode]);
		nicam = 0x0200;
		break;
	case MSP_MODE_FM_RADIO:
		dprintk(KERN_DEBUG "msp3400: FM-Radio setstereo: %s\n",strmode[mode]);
		break;
	default:
		dprintk(KERN_DEBUG "msp3400: mono setstereo\n");
		return;
	}

	/* switch audio */
	switch (mode) {
	case VIDEO_SOUND_STEREO:
		src = 0x0020 | nicam;
#if 0 
		/* spatial effect */
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0005,0x4000);
#endif
		break;
	case VIDEO_SOUND_MONO:
		if (msp->mode == MSP_MODE_AM_NICAM) {
			dprintk("msp3400: switching to AM mono\n");
			/* AM mono decoding is handled by tuner, not MSP chip */
			/* SCART switching control register */
			msp3400c_set_scart(client,SCART_MONO,0);
			src = 0x0200;
			break;
		}
	case VIDEO_SOUND_LANG1:
		src = 0x0000 | nicam;
		break;
	case VIDEO_SOUND_LANG2:
		src = 0x0010 | nicam;
		break;
	}
	dprintk(KERN_DEBUG
		"msp3400: setstereo final source/matrix = 0x%x\n", src);

	if (dolby) {
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0008,0x0520);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0009,0x0620);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000a,src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000b,src);
	} else {
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0008,src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x0009,src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000a,src);
		msp3400c_write(client,I2C_MSP3400C_DFP, 0x000b,src);
	}
}

static void
msp3400c_print_mode(struct msp3400c *msp)
{
	if (msp->main == msp->second) {
		printk(KERN_DEBUG "msp3400: mono sound carrier: %d.%03d MHz\n",
		       msp->main/910000,(msp->main/910)%1000);
	} else {
		printk(KERN_DEBUG "msp3400: main sound carrier: %d.%03d MHz\n",
		       msp->main/910000,(msp->main/910)%1000);
	}
	if (msp->mode == MSP_MODE_FM_NICAM1 ||
	    msp->mode == MSP_MODE_FM_NICAM2)
		printk(KERN_DEBUG "msp3400: NICAM/FM carrier   : %d.%03d MHz\n",
		       msp->second/910000,(msp->second/910)%1000);
	if (msp->mode == MSP_MODE_AM_NICAM)
		printk(KERN_DEBUG "msp3400: NICAM/AM carrier   : %d.%03d MHz\n",
		       msp->second/910000,(msp->second/910)%1000);
	if (msp->mode == MSP_MODE_FM_TERRA &&
	    msp->main != msp->second) {
		printk(KERN_DEBUG "msp3400: FM-stereo carrier : %d.%03d MHz\n",
		       msp->second/910000,(msp->second/910)%1000);
	}
}

static void
msp3400c_restore_dfp(struct i2c_client *client)
{
	struct msp3400c *msp = i2c_get_clientdata(client);
	int i;

	for (i = 0; i < DFP_COUNT; i++) {
		if (-1 == msp->dfp_regs[i])
			continue;
		msp3400c_write(client,I2C_MSP3400C_DFP, i, msp->dfp_regs[i]);
	}
}

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

struct REGISTER_DUMP {
	int   addr;
	char *name;
};

struct REGISTER_DUMP d1[] = {
	{ 0x007e, "autodetect" },
	{ 0x0023, "C_AD_BITS " },
	{ 0x0038, "ADD_BITS  " },
	{ 0x003e, "CIB_BITS  " },
	{ 0x0057, "ERROR_RATE" },
};

static int
autodetect_stereo(struct i2c_client *client)
{
	struct msp3400c *msp = i2c_get_clientdata(client);
	int val;
	int newstereo = msp->stereo;
	int newnicam  = msp->nicam_on;
	int update = 0;

	switch (msp->mode) {
	case MSP_MODE_FM_TERRA:
		val = msp3400c_read(client, I2C_MSP3400C_DFP, 0x18);
		if (val > 32767)
			val -= 65536;
		dprintk(KERN_DEBUG
			"msp34xx: stereo detect register: %d\n",val);
		if (val > 4096) {
			newstereo = VIDEO_SOUND_STEREO | VIDEO_SOUND_MONO;
		} else if (val < -4096) {
			newstereo = VIDEO_SOUND_LANG1 | VIDEO_SOUND_LANG2;
		} else {
			newstereo = VIDEO_SOUND_MONO;
		}
		newnicam = 0;
		break;
	case MSP_MODE_FM_NICAM1:
	case MSP_MODE_FM_NICAM2:
	case MSP_MODE_AM_NICAM:
		val = msp3400c_read(client, I2C_MSP3400C_DEM, 0x23);
		dprintk(KERN_DEBUG
			"msp34xx: nicam sync=%d, mode=%d\n",
			val & 1, (val & 0x1e) >> 1);

		if (val & 1) {
			/* nicam synced */
			switch ((val & 0x1e) >> 1)  {
			case 0:
			case 8:
				newstereo = VIDEO_SOUND_STEREO;
				break;
			case 1:
			case 9:
				newstereo = VIDEO_SOUND_MONO
					| VIDEO_SOUND_LANG1;
				break;
			case 2:
			case 10:
				newstereo = VIDEO_SOUND_MONO
					| VIDEO_SOUND_LANG1
					| VIDEO_SOUND_LANG2;
				break;
			default:
				newstereo = VIDEO_SOUND_MONO;
				break;
			}
			newnicam=1;
		} else {
			newnicam = 0;
			newstereo = VIDEO_SOUND_MONO;
		}
		break;
	case MSP_MODE_BTSC:
		val = msp3400c_read(client, I2C_MSP3400C_DEM, 0x200);
		dprintk(KERN_DEBUG
			"msp3410: status=0x%x (pri=%s, sec=%s, %s%s%s)\n",
			val,
			(val & 0x0002) ? "no"     : "yes",
			(val & 0x0004) ? "no"     : "yes",
			(val & 0x0040) ? "stereo" : "mono",
			(val & 0x0080) ? ", nicam 2nd mono" : "",
			(val & 0x0100) ? ", bilingual/SAP"  : "");
		newstereo = VIDEO_SOUND_MONO;
		if (val & 0x0040) newstereo |= VIDEO_SOUND_STEREO;
		if (val & 0x0100) newstereo |= VIDEO_SOUND_LANG1;
		break;
	}
	if (newstereo != msp->stereo) {
		update = 1;
		dprintk(KERN_DEBUG "msp34xx: watch: stereo %d => %d\n",
			msp->stereo,newstereo);
		msp->stereo   = newstereo;
	}
	if (newnicam != msp->nicam_on) {
		update = 1;
		dprintk(KERN_DEBUG "msp34xx: watch: nicam %d => %d\n",
			msp->nicam_on,newnicam);
		msp->nicam_on = newnicam;
	}
	return update;
}

/*
 * A kernel thread for msp3400 control -- we don't want to block the
 * in the ioctl while doing the sound carrier & stereo detect
 */

static int msp34xx_sleep(struct msp3400c *msp, int timeout)
{
	DECLARE_WAITQUEUE(wait, current);
	
	add_wait_queue(&msp->wq, &wait);
	if (!msp->rmmod) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (timeout < 0)
			schedule();
		else
			schedule_timeout(timeout);
	}
	remove_wait_queue(&msp->wq, &wait);
	return msp->rmmod || signal_pending(current);
}

static void msp3400c_stereo_wake(unsigned long data)
{
	struct msp3400c *msp = (struct msp3400c*)data;   /* XXX alpha ??? */

	wake_up_interruptible(&msp->wq);
}

/* stereo/multilang monitoring */
static void watch_stereo(struct i2c_client *client)
{
	struct msp3400c *msp = i2c_get_clientdata(client);

	if (autodetect_stereo(client)) {
		if (msp->stereo & VIDEO_SOUND_STEREO)
			msp3400c_setstereo(client,VIDEO_SOUND_STEREO);
		else if (msp->stereo & VIDEO_SOUND_LANG1)
			msp3400c_setstereo(client,VIDEO_SOUND_LANG1);
		else if (msp->stereo & VIDEO_SOUND_LANG2)
			msp3400c_setstereo(client,VIDEO_SOUND_LANG2);
		else
			msp3400c_setstereo(client,VIDEO_SOUND_MONO);
	}
	if (once)
		msp->watch_stereo = 0;
	if (msp->watch_stereo)
		mod_timer(&msp->wake_stereo, jiffies+5*HZ);
}

static int msp3400c_thread(void *data)
{
	struct i2c_client *client = data;
	struct msp3400c *msp = i2c_get_clientdata(client);
	
	struct CARRIER_DETECT *cd;
	int count, max1,max2,val1,val2, val,this;
	
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,61)
	lock_kernel();
	daemonize();
	sigfillset(&current->blocked);
	strcpy(current->comm,"msp3400");
	unlock_kernel();
#else
	daemonize("msp3400");
	allow_signal(SIGTERM);
#endif
	printk("msp3400: daemon started\n");

	for (;;) {
		d2printk("msp3400: thread: sleep\n");
		if (msp34xx_sleep(msp,-1))
			goto done;

		d2printk("msp3400: thread: wakeup\n");
		msp->active = 1;

		if (msp->watch_stereo) {
			watch_stereo(client);
			msp->active = 0;
			continue;
		}

		/* some time for the tuner to sync */
		if (msp34xx_sleep(msp,HZ/5))
			goto done;
		
	restart:
		if (VIDEO_MODE_RADIO == msp->norm ||
		    MSP_MODE_EXTERN  == msp->mode) {
			/* no carrier scan, just unmute */
			printk("msp3400: thread: no carrier scan\n");
			msp3400c_setvolume(client, msp->muted,
					   msp->left, msp->right);
			continue;
		}
		msp->restart = 0;
		msp3400c_setvolume(client, msp->muted, 0, 0);
		msp3400c_setmode(client, MSP_MODE_AM_DETECT /* +1 */ );
		val1 = val2 = 0;
		max1 = max2 = -1;
		del_timer(&msp->wake_stereo);
		msp->watch_stereo = 0;

		/* carrier detect pass #1 -- main carrier */
		cd = carrier_detect_main; count = CARRIER_COUNT(carrier_detect_main);

		if (amsound && (msp->norm == VIDEO_MODE_SECAM)) {
			/* autodetect doesn't work well with AM ... */
			max1 = 3;
			count = 0;
			dprintk("msp3400: AM sound override\n");
		}

		for (this = 0; this < count; this++) {
			msp3400c_setcarrier(client, cd[this].cdo,cd[this].cdo);

			if (msp34xx_sleep(msp,HZ/10))
				goto done;
			if (msp->restart)
				msp->restart = 0;

			val = msp3400c_read(client, I2C_MSP3400C_DFP, 0x1b);
			if (val > 32767)
				val -= 65536;
			if (val1 < val)
				val1 = val, max1 = this;
			dprintk("msp3400: carrier1 val: %5d / %s\n", val,cd[this].name);
		}
	
		/* carrier detect pass #2 -- second (stereo) carrier */
		switch (max1) {
		case 1: /* 5.5 */
			cd = carrier_detect_55; count = CARRIER_COUNT(carrier_detect_55);
			break;
		case 3: /* 6.5 */
			cd = carrier_detect_65; count = CARRIER_COUNT(carrier_detect_65);
			break;
		case 0: /* 4.5 */
		case 2: /* 6.0 */
		default:
			cd = NULL; count = 0;
			break;
		}
		
		if (amsound && (msp->norm == VIDEO_MODE_SECAM)) {
			/* autodetect doesn't work well with AM ... */
			cd = NULL; count = 0; max2 = 0;
		}
		for (this = 0; this < count; this++) {
			msp3400c_setcarrier(client, cd[this].cdo,cd[this].cdo);

			if (msp34xx_sleep(msp,HZ/10))
				goto done;
			if (msp->restart)
				goto restart;

			val = msp3400c_read(client, I2C_MSP3400C_DFP, 0x1b);
			if (val > 32767)
				val -= 65536;
			if (val2 < val)
				val2 = val, max2 = this;
			dprintk("msp3400: carrier2 val: %5d / %s\n", val,cd[this].name);
		}

		/* programm the msp3400 according to the results */
		msp->main   = carrier_detect_main[max1].cdo;
		switch (max1) {
		case 1: /* 5.5 */
			if (max2 == 0) {
				/* B/G FM-stereo */
				msp->second = carrier_detect_55[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_FM_TERRA);
				msp->nicam_on = 0;
				msp3400c_setstereo(client, VIDEO_SOUND_MONO);
				msp->watch_stereo = 1;
			} else if (max2 == 1 && HAVE_NICAM(msp)) {
				/* B/G NICAM */
				msp->second = carrier_detect_55[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_FM_NICAM1);
				msp->nicam_on = 1;
				msp3400c_setcarrier(client, msp->second, msp->main);
				msp->watch_stereo = 1;
			} else {
				goto no_second;
			}
			break;
		case 2: /* 6.0 */
			/* PAL I NICAM */
			msp->second = MSP_CARRIER(6.552);
			msp3400c_setmode(client, MSP_MODE_FM_NICAM2);
			msp->nicam_on = 1;
			msp3400c_setcarrier(client, msp->second, msp->main);
			msp->watch_stereo = 1;
			break;
		case 3: /* 6.5 */
			if (max2 == 1 || max2 == 2) {
				/* D/K FM-stereo */
				msp->second = carrier_detect_65[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_FM_TERRA);
				msp->nicam_on = 0;
				msp3400c_setstereo(client, VIDEO_SOUND_MONO);
				msp->watch_stereo = 1;
			} else if (max2 == 0 &&
				   msp->norm == VIDEO_MODE_SECAM) {
				/* L NICAM or AM-mono */
				msp->second = carrier_detect_65[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_AM_NICAM);
				msp->nicam_on = 0;
				msp3400c_setstereo(client, VIDEO_SOUND_MONO);
				msp3400c_setcarrier(client, msp->second, msp->main);
				/* volume prescale for SCART (AM mono input) */
				msp3400c_write(client,I2C_MSP3400C_DFP, 0x000d, 0x1900);
				msp->watch_stereo = 1;
			} else if (max2 == 0 && HAVE_NICAM(msp)) {
				/* D/K NICAM */
				msp->second = carrier_detect_65[max2].cdo;
				msp3400c_setmode(client, MSP_MODE_FM_NICAM1);
				msp->nicam_on = 1;
				msp3400c_setcarrier(client, msp->second, msp->main);
				msp->watch_stereo = 1;
			} else {
				goto no_second;
			}
			break;
		case 0: /* 4.5 */
		default:
		no_second:
			msp->second = carrier_detect_main[max1].cdo;
			msp3400c_setmode(client, MSP_MODE_FM_TERRA);
			msp->nicam_on = 0;
			msp3400c_setcarrier(client, msp->second, msp->main);
			msp->stereo = VIDEO_SOUND_MONO;
			msp3400c_setstereo(client, VIDEO_SOUND_MONO);
			break;
		}

		/* unmute + restore dfp registers */
		msp3400c_setvolume(client, msp->muted, msp->left, msp->right);
		msp3400c_restore_dfp(client);

		if (msp->watch_stereo)
			mod_timer(&msp->wake_stereo, jiffies+5*HZ);

		if (debug)
			msp3400c_print_mode(msp);
		
		msp->active = 0;
	}

done:
	msp->active = 0;
	dprintk(KERN_DEBUG "msp3400: thread: exit\n");
        complete_and_exit(&msp->texit, 0);
}

/* ----------------------------------------------------------------------- */
/* this one uses the automatic sound standard detection of newer           */
/* msp34xx chip versions                                                   */

static struct MODES {
	int retval;
	int main, second;
	char *name;
} modelist[] = {
	{ 0x0000, 0, 0, "ERROR" },
	{ 0x0001, 0, 0, "autodetect start" },
	{ 0x0002, MSP_CARRIER(4.5), MSP_CARRIER(4.72), "4.5/4.72  M Dual FM-Stereo" },
	{ 0x0003, MSP_CARRIER(5.5), MSP_CARRIER(5.7421875), "5.5/5.74  B/G Dual FM-Stereo" },
	{ 0x0004, MSP_CARRIER(6.5), MSP_CARRIER(6.2578125), "6.5/6.25  D/K1 Dual FM-Stereo" },
	{ 0x0005, MSP_CARRIER(6.5), MSP_CARRIER(6.7421875), "6.5/6.74  D/K2 Dual FM-Stereo" },
	{ 0x0006, MSP_CARRIER(6.5), MSP_CARRIER(6.5), "6.5  D/K FM-Mono (HDEV3)" },
	{ 0x0008, MSP_CARRIER(5.5), MSP_CARRIER(5.85), "5.5/5.85  B/G NICAM FM" },
	{ 0x0009, MSP_CARRIER(6.5), MSP_CARRIER(5.85), "6.5/5.85  L NICAM AM" },
	{ 0x000a, MSP_CARRIER(6.0), MSP_CARRIER(6.55), "6.0/6.55  I NICAM FM" },
	{ 0x000b, MSP_CARRIER(6.5), MSP_CARRIER(5.85), "6.5/5.85  D/K NICAM FM" },
	{ 0x000c, MSP_CARRIER(6.5), MSP_CARRIER(5.85), "6.5/5.85  D/K NICAM FM (HDEV2)" },
	{ 0x0020, MSP_CARRIER(4.5), MSP_CARRIER(4.5), "4.5  M BTSC-Stereo" },
	{ 0x0021, MSP_CARRIER(4.5), MSP_CARRIER(4.5), "4.5  M BTSC-Mono + SAP" },
	{ 0x0030, MSP_CARRIER(4.5), MSP_CARRIER(4.5), "4.5  M EIA-J Japan Stereo" },
	{ 0x0040, MSP_CARRIER(10.7), MSP_CARRIER(10.7), "10.7  FM-Stereo Radio" },
	{ 0x0050, MSP_CARRIER(6.5), MSP_CARRIER(6.5), "6.5  SAT-Mono" },
	{ 0x0051, MSP_CARRIER(7.02), MSP_CARRIER(7.20), "7.02/7.20  SAT-Stereo" },
	{ 0x0060, MSP_CARRIER(7.2), MSP_CARRIER(7.2), "7.2  SAT ADR" },
	{     -1, 0, 0, NULL }, /* EOF */
};
 
static int msp3410d_thread(void *data)
{
	struct i2c_client *client = data;
	struct msp3400c *msp = i2c_get_clientdata(client);
	int mode,val,i,std;
    
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,61)
	lock_kernel();
	daemonize();
	sigfillset(&current->blocked);
	strcpy(current->comm,"msp3410 [auto]");
	unlock_kernel();
#else
	daemonize("msp3410 [auto]");
	allow_signal(SIGTERM);
#endif
	printk("msp3410: daemon started\n");

	for (;;) {
		d2printk(KERN_DEBUG "msp3410: thread: sleep\n");
		if (msp34xx_sleep(msp,-1))
			goto done;

		d2printk(KERN_DEBUG "msp3410: thread: wakeup\n");
		msp->active = 1;

		if (msp->watch_stereo) {
			watch_stereo(client);
			msp->active = 0;
			continue;
		}
	
		/* some time for the tuner to sync */
		if (msp34xx_sleep(msp,HZ/5))
			goto done;

	restart:
		if (msp->mode == MSP_MODE_EXTERN) {
			/* no carrier scan needed, just unmute */
			dprintk(KERN_DEBUG "msp3410: thread: no carrier scan\n");
			msp3400c_setvolume(client, msp->muted,
					   msp->left, msp->right);
			continue;
		}
		msp->restart = 0;
		del_timer(&msp->wake_stereo);
		msp->watch_stereo = 0;

		/* put into sane state (and mute) */
		msp3400c_reset(client);

		/* start autodetect */
		switch (msp->norm) {
		case VIDEO_MODE_PAL:
			mode = 0x1003;
			std  = 1;