/*
 * Programming the mspx4xx sound processor family
 *
 * (c) 1997-2001 Gerd Knorr <kraxel@bytesex.org>
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/videodev.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/audiochip.h>
#include <linux/kthread.h>
#include <linux/suspend.h>
#include "msp3400.h"

/* this one uses the automatic sound standard detection of newer msp34xx
   chip versions */
static struct {
	int retval;
	int main, second;
	char *name;
} msp_stdlist[] = {
	{ 0x0000, 0, 0, "could not detect sound standard" },
	{ 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 struct msp3400c_init_data_dem {
	int fir1[6];
	int fir2[6];
	int cdo1;
	int cdo2;
	int ad_cv;
	int mode_reg;
	int dsp_src;
	int dsp_matrix;
} msp3400c_init_data[] = {
	{	/* AM (for carrier detect / msp3400) */
		{75, 19, 36, 35, 39, 40},
		{75, 19, 36, 35, 39, 40},
		MSP_CARRIER(5.5), MSP_CARRIER(5.5),
		0x00d0, 0x0500, 0x0020, 0x3000
	},{	/* AM (for carrier detect / msp3410) */
		{-1, -1, -8, 2, 59, 126},
		{-1, -1, -8, 2, 59, 126},
		MSP_CARRIER(5.5), MSP_CARRIER(5.5),
		0x00d0, 0x0100, 0x0020, 0x3000
	},{	/* FM Radio */
		{-8, -8, 4, 6, 78, 107},
		{-8, -8, 4, 6, 78, 107},
		MSP_CARRIER(10.7), MSP_CARRIER(10.7),
		0x00d0, 0x0480, 0x0020, 0x3000
	},{	/* Terrestial FM-mono + FM-stereo */
		{3, 18, 27, 48, 66, 72},
		{3, 18, 27, 48, 66, 72},
		MSP_CARRIER(5.5), MSP_CARRIER(5.5),
		0x00d0, 0x0480, 0x0030, 0x3000
	},{	/* Sat FM-mono */
		{ 1, 9, 14, 24, 33, 37},
		{ 3, 18, 27, 48, 66, 72},
		MSP_CARRIER(6.5), MSP_CARRIER(6.5),
		0x00c6, 0x0480, 0x0000, 0x3000
	},{	/* NICAM/FM --  B/G (5.5/5.85), D/K (6.5/5.85) */
		{-2, -8, -10, 10, 50, 86},
		{3, 18, 27, 48, 66, 72},
		MSP_CARRIER(5.5), MSP_CARRIER(5.5),
		0x00d0, 0x0040, 0x0120, 0x3000
	},{	/* NICAM/FM -- I (6.0/6.552) */
		{2, 4, -6, -4, 40, 94},
		{3, 18, 27, 48, 66, 72},
		MSP_CARRIER(6.0), MSP_CARRIER(6.0),
		0x00d0, 0x0040, 0x0120, 0x3000
	},{	/* NICAM/AM -- L (6.5/5.85) */
		{-2, -8, -10, 10, 50, 86},
		{-4, -12, -9, 23, 79, 126},
		MSP_CARRIER(6.5), MSP_CARRIER(6.5),
		0x00c6, 0x0140, 0x0120, 0x7c00
	},
};

struct msp3400c_carrier_detect {
	int   cdo;
	char *name;
};

static struct msp3400c_carrier_detect msp3400c_carrier_detect_main[] = {
	/* main carrier */
	{ MSP_CARRIER(4.5),        "4.5   NTSC"                   },
	{ MSP_CARRIER(5.5),        "5.5   PAL B/G"                },
	{ MSP_CARRIER(6.0),        "6.0   PAL I"                  },
	{ MSP_CARRIER(6.5),        "6.5   PAL D/K + SAT + SECAM"  }
};

static struct msp3400c_carrier_detect msp3400c_carrier_detect_55[] = {
	/* PAL B/G */
	{ MSP_CARRIER(5.7421875),  "5.742 PAL B/G FM-stereo"     },
	{ MSP_CARRIER(5.85),       "5.85  PAL B/G NICAM"         }
};

static struct msp3400c_carrier_detect msp3400c_carrier_detect_65[] = {
	/* PAL SAT / SECAM */
	{ MSP_CARRIER(5.85),       "5.85  PAL D/K + SECAM NICAM" },
	{ MSP_CARRIER(6.2578125),  "6.25  PAL D/K1 FM-stereo" },
	{ MSP_CARRIER(6.7421875),  "6.74  PAL D/K2 FM-stereo" },
	{ MSP_CARRIER(7.02),       "7.02  PAL SAT FM-stereo s/b" },
	{ MSP_CARRIER(7.20),       "7.20  PAL SAT FM-stereo s"   },
	{ MSP_CARRIER(7.38),       "7.38  PAL SAT FM-stereo b"   },
};

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

const char *msp_standard_std_name(int std)
{
	int i;

	for (i = 0; msp_stdlist[i].name != NULL; i++)
		if (msp_stdlist[i].retval == std)
			return msp_stdlist[i].name;
	return "unknown";
}

void msp_set_source(struct i2c_client *client, u16 src)
{
	struct msp_state *state = i2c_get_clientdata(client);

	if (msp_dolby) {
		msp_write_dsp(client, 0x0008, 0x0520); /* I2S1 */
		msp_write_dsp(client, 0x0009, 0x0620); /* I2S2 */
	} else {
		msp_write_dsp(client, 0x0008, src);
		msp_write_dsp(client, 0x0009, src);
	}
	msp_write_dsp(client, 0x000a, src);
	msp_write_dsp(client, 0x000b, src);
	msp_write_dsp(client, 0x000c, src);
	if (state->has_scart23_in_scart2_out)
		msp_write_dsp(client, 0x0041, src);
}

void msp3400c_set_carrier(struct i2c_client *client, int cdo1, int cdo2)
{
	msp_write_dem(client, 0x0093, cdo1 & 0xfff);
	msp_write_dem(client, 0x009b, cdo1 >> 12);
	msp_write_dem(client, 0x00a3, cdo2 & 0xfff);
	msp_write_dem(client, 0x00ab, cdo2 >> 12);
	msp_write_dem(client, 0x0056, 0); /* LOAD_REG_1/2 */
}

void msp3400c_set_mode(struct i2c_client *client, int mode)
{
	struct msp_state *state = i2c_get_clientdata(client);
	struct msp3400c_init_data_dem *data = &msp3400c_init_data[mode];
	int i;

	v4l_dbg(1, msp_debug, client, "set_mode: %d\n", mode);
	state->mode = mode;
	state->rxsubchans = V4L2_TUNER_SUB_MONO;

	msp_write_dem(client, 0x00bb, data->ad_cv);

	for (i = 5; i >= 0; i--)               /* fir 1 */
		msp_write_dem(client, 0x0001, data->fir1[i]);

	msp_write_dem(client, 0x0005, 0x0004); /* fir 2 */
	msp_write_dem(client, 0x0005, 0x0040);
	msp_write_dem(client, 0x0005, 0x0000);
	for (i = 5; i >= 0; i--)
		msp_write_dem(client, 0x0005, data->fir2[i]);

	msp_write_dem(client, 0x0083, data->mode_reg);

	msp3400c_set_carrier(client, data->cdo1, data->cdo2);

	msp_set_source(client, data->dsp_src);
	msp_write_dsp(client, 0x000e, data->dsp_matrix);

	if (state->has_nicam) {
		/* nicam prescale */
		msp_write_dsp(client, 0x0010, 0x5a00); /* was: 0x3000 */
	}
}

/* Set audio mode. Note that the pre-'G' models do not support BTSC+SAP,
   nor do they support stereo BTSC. */
void msp3400c_set_audmode(struct i2c_client *client)
{
	static char *strmode[] = { "mono", "stereo", "lang2", "lang1" };
	struct msp_state *state = i2c_get_clientdata(client);
	char *modestr = (state->audmode >= 0 && state->audmode < 4) ?
		strmode[state->audmode] : "unknown";
	int src = 0;	/* channel source: FM/AM, nicam or SCART */

	if (state->opmode == OPMODE_AUTOSELECT) {
		/* this method would break everything, let's make sure
		 * it's never called
		 */
		v4l_dbg(1, msp_debug, client,
			"set_audmode called with mode=%d instead of set_source (ignored)\n",
			state->audmode);
		return;
	}

	/* switch demodulator */
	switch (state->mode) {
	case MSP_MODE_FM_TERRA:
		v4l_dbg(1, msp_debug, client, "FM set_audmode: %s\n", modestr);
		switch (state->audmode) {
		case V4L2_TUNER_MODE_STEREO:
			msp_write_dsp(client, 0x000e, 0x3001);
			break;
		case V4L2_TUNER_MODE_MONO:
		case V4L2_TUNER_MODE_LANG1:
		case V4L2_TUNER_MODE_LANG2:
			msp_write_dsp(client, 0x000e, 0x3000);
			break;
		}
		break;
	case MSP_MODE_FM_SAT:
		v4l_dbg(1, msp_debug, client, "SAT set_audmode: %s\n", modestr);
		switch (state->audmode) {
		case V4L2_TUNER_MODE_MONO:
			msp3400c_set_carrier(client, MSP_CARRIER(6.5), MSP_CARRIER(6.5));
			break;
		case V4L2_TUNER_MODE_STEREO:
			msp3400c_set_carrier(client, MSP_CARRIER(7.2), MSP_CARRIER(7.02));
			break;
		case V4L2_TUNER_MODE_LANG1:
			msp3400c_set_carrier(client, MSP_CARRIER(7.38), MSP_CARRIER(7.02));
			break;
		case V4L2_TUNER_MODE_LANG2:
			msp3400c_set_carrier(client, MSP_CARRIER(7.38), MSP_CARRIER(7.02));
			break;
		}
		break;
	case MSP_MODE_FM_NICAM1:
	case MSP_MODE_FM_NICAM2:
	case MSP_MODE_AM_NICAM:
		v4l_dbg(1, msp_debug, client, "NICAM set_audmode: %s\n",modestr);
		msp3400c_set_carrier(client, state->second, state->main);
		if (state->nicam_on)
			src = 0x0100;  /* NICAM */
		break;
	case MSP_MODE_BTSC:
		v4l_dbg(1, msp_debug, client, "BTSC set_audmode: %s\n",modestr);
		break;
	case MSP_MODE_EXTERN:
		v4l_dbg(1, msp_debug, client, "extern set_audmode: %s\n",modestr);
		src = 0x0200;  /* SCART */
		break;
	case MSP_MODE_FM_RADIO:
		v4l_dbg(1, msp_debug, client, "FM-Radio set_audmode: %s\n",modestr);
		break;
	default:
		v4l_dbg(1, msp_debug, client, "mono set_audmode\n");
		return;
	}

	/* switch audio */
	switch (state->audmode) {
	case V4L2_TUNER_MODE_STEREO:
		src |= 0x0020;
		break;
	case V4L2_TUNER_MODE_MONO:
		if (state->mode == MSP_MODE_AM_NICAM) {
			v4l_dbg(1, msp_debug, client, "switching to AM mono\n");
			/* AM mono decoding is handled by tuner, not MSP chip */
			/* SCART switching control register */
			msp_set_scart(client, SCART_MONO, 0);
			src = 0x0200;
			break;
		}
		if (state->rxsubchans & V4L2_TUNER_SUB_STEREO)
			src = 0x0030;
		break;
	case V4L2_TUNER_MODE_LANG1:
		/* switch to stereo for stereo transmission, otherwise
		   keep first language */
		if (state->rxsubchans & V4L2_TUNER_SUB_STEREO)
			src |= 0x0020;
		break;
	case V4L2_TUNER_MODE_LANG2:
		src |= 0x0010;
		break;
	}
	v4l_dbg(1, msp_debug, client, "set_audmode final source/matrix = 0x%x\n", src);

	msp_set_source(client, src);
}

static void msp3400c_print_mode(struct i2c_client *client)
{
	struct msp_state *state = i2c_get_clientdata(client);

	if (state->main == state->second) {
		v4l_dbg(1, msp_debug, client, "mono sound carrier: %d.%03d MHz\n",
		       state->main / 910000, (state->main / 910) % 1000);
	} else {
		v4l_dbg(1, msp_debug, client, "main sound carrier: %d.%03d MHz\n",
		       state->main / 910000, (state->main / 910) % 1000);
	}
	if (state->mode == MSP_MODE_FM_NICAM1 || state->mode == MSP_MODE_FM_NICAM2)
		v4l_dbg(1, msp_debug, client, "NICAM/FM carrier  : %d.%03d MHz\n",
		       state->second / 910000, (state->second/910) % 1000);
	if (state->mode == MSP_MODE_AM_NICAM)
		v4l_dbg(1, msp_debug, client, "NICAM/AM carrier  : %d.%03d MHz\n",
		       state->second / 910000, (state->second / 910) % 1000);
	if (state->mode == MSP_MODE_FM_TERRA && state->main != state->second) {
		v4l_dbg(1, msp_debug, client, "FM-stereo carrier : %d.%03d MHz\n",
		       state->second / 910000, (state->second / 910) % 1000);
	}
}

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

static int msp3400c_detect_stereo(struct i2c_client *client)
{
	struct msp_state *state = i2c_get_clientdata(client);
	int val;
	int rxsubchans = state->rxsubchans;
	int newnicam = state->nicam_on;
	int update = 0;

	switch (state->mode) {
	case MSP_MODE_FM_TERRA:
		val = msp_read_dsp(client, 0x18);
		if (val > 32767)
			val -= 65536;
		v4l_dbg(2, msp_debug, client, "stereo detect register: %d\n", val);
		if (val > 4096) {
			rxsubchans = V4L2_TUNER_SUB_STEREO;
		} else if (val < -4096) {
			rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
		} else {
			rxsubchans = V4L2_TUNER_SUB_MONO;
		}
		newnicam = 0;
		break;
	case MSP_MODE_FM_NICAM1:
	case MSP_MODE_FM_NICAM2:
	case MSP_MODE_AM_NICAM:
		val = msp_read_dem(client, 0x23);
		v4l_dbg(2, msp_debug, client, "nicam sync=%d, mode=%d\n",
			val & 1, (val & 0x1e) >> 1);

		if (val & 1) {
			/* nicam synced */
			switch ((val & 0x1e) >> 1)  {
			case 0:
			case 8:
				rxsubchans = V4L2_TUNER_SUB_STEREO;
				break;
			case 1:
			case 9:
				rxsubchans = V4L2_TUNER_SUB_MONO;
				break;
			case 2:
			case 10:
				rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
				break;
			default:
				rxsubchans = V4L2_TUNER_SUB_MONO;
				break;
			}
			newnicam = 1;
		} else {
			newnicam = 0;
			rxsubchans = V4L2_TUNER_SUB_MONO;
		}
		break;
	}
	if (rxsubchans != state->rxsubchans) {
		update = 1;
		v4l_dbg(1, msp_debug, client, "watch: rxsubchans %02x => %02x\n",
			state->rxsubchans, rxsubchans);
		state->rxsubchans = rxsubchans;
	}
	if (newnicam != state->nicam_on) {
		update = 1;
		v4l_dbg(1, msp_debug, client, "watch: nicam %d => %d\n",
			state->nicam_on, newnicam);
		state->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
 */
/* stereo/multilang monitoring */
static void watch_stereo(struct i2c_client *client)
{
	struct msp_state *state = i2c_get_clientdata(client);

	if (msp3400c_detect_stereo(client)) {
		msp3400c_set_audmode(client);
	}

	if (msp_once)
		state->watch_stereo = 0;
}

int msp3400c_thread(void *data)
{
	struct i2c_client *client = data;
	struct msp_state *state = i2c_get_clientdata(client);
	struct msp3400c_carrier_detect *cd;
	int count, max1, max2, val1, val2, val, this;


	v4l_dbg(1, msp_debug, client, "msp3400 daemon started\n");
	for (;;) {
		v4l_dbg(2, msp_debug, client, "msp3400 thread: sleep\n");
		msp_sleep(state, -1);
		v4l_dbg(2, msp_debug, client, "msp3400 thread: wakeup\n");

	restart:
		v4l_dbg(2, msp_debug, client, "thread: restart scan\n");
		state->restart = 0;
		if (kthread_should_stop())
			break;

		if (state->radio || MSP_MODE_EXTERN == state->mode) {
			/* no carrier scan, just unmute */
			v4l_dbg(1, msp_debug, client, "thread: no carrier scan\n");
			msp_set_audio(client);
			continue;
		}

		/* mute */
		msp_set_mute(client);
		msp3400c_set_mode(client, MSP_MODE_AM_DETECT /* +1 */ );
		val1 = val2 = 0;
		max1 = max2 = -1;
		state->watch_stereo = 0;
		state->nicam_on = 0;

		/* some time for the tuner to sync */
		if (msp_sleep(state, 200))
			goto restart;

		/* carrier detect pass #1 -- main carrier */
		cd = msp3400c_carrier_detect_main;
		count = ARRAY_SIZE(msp3400c_carrier_detect_main);

		if (msp_amsound && (state->v4l2_std & V4L2_STD_SECAM)) {
			/* autodetect doesn't work well with AM ... */
			max1 = 3;
			count = 0;
			v4l_dbg(1, msp_debug, client, "AM sound override\n");
		}

		for (this = 0; this < count; this++) {
			msp3400c_set_carrier(client, cd[this].cdo, cd[this].cdo);
			if (msp_sleep(state,100))
				goto restart;
			val = msp_read_dsp(client, 0x1b);
			if (val > 32767)
				val -= 65536;
			if (val1 < val)
				val1 = val, max1 = this;
			v4l_dbg(1, msp_debug, client, "carrier1 val: %5d / %s\n", val,cd[this].name);
		}

		/* carrier detect pass #2 -- second (stereo) carrier */
		switch (max1) {
		case 1: /* 5.5 */
			cd = msp3400c_carrier_detect_55;
			count = ARRAY_SIZE(msp3400c_carrier_detect_55);
			break;
		case 3: /* 6.5 */
			cd = msp3400c_carrier_detect_65;
			count = ARRAY_SIZE(msp3400c_carrier_detect_65);
			break;
		case 0: /* 4.5 */
		case 2: /* 6.0 */
		default:
			cd = NULL;
			count = 0;
			break;
		}

		if (msp_amsound && (state->v4l2_std & V4L2_STD_SECAM)) {
			/* autodetect doesn't work well with AM ... */
			cd = NULL;
			count = 0;
			max2 = 0;
		}
		for (this = 0; this < count; this++) {
			msp3400c_set_carrier(client, cd[this].cdo, cd[this].cdo);
			if (msp_sleep(state,100))
				goto restart;
			val = msp_read_dsp(client, 0x1b);
			if (val > 32767)
				val -= 65536;
			if (val2 < val)
				val2 = val, max2 = this;
			v4l_dbg(1, msp_debug, client, "carrier2 val: %5d / %s\n", val,cd[this].name);
		}

		/* program the msp3400 according to the results */
		state->main = msp3400c_carrier_detect_main[max1].cdo;
		switch (max1) {
		case 1: /* 5.5 */
			if (max2 == 0) {
				/* B/G FM-stereo */
				state->second = msp3400c_carrier_detect_55[max2].cdo;
				msp3400c_set_mode(client, MSP_MODE_FM_TERRA);
				state->watch_stereo = 1;
			} else if (max2 == 1 && state->has_nicam) {
				/* B/G NICAM */
				state->second = msp3400c_carrier_detect_55[max2].cdo;
				msp3400c_set_mode(client, MSP_MODE_FM_NICAM1);
				msp3400c_set_carrier(client, state->second, state->main);
				state->nicam_on = 1;
				state->watch_stereo = 1;
			} else {
				goto no_second;
			}
			break;
		case 2: /* 6.0 */
			/* PAL I NICAM */
			state->second = MSP_CARRIER(6.552);
			msp3400c_set_mode(client, MSP_MODE_FM_NICAM2);
			msp3400c_set_carrier(client, state->second, state->main);
			state->nicam_on = 1;
			state->watch_stereo = 1;
			break;
		case 3: /* 6.5 */
			if (max2 == 1 || max2 == 2) {
				/* D/K FM-stereo */
				state->second = msp3400c_carrier_detect_65[max2].cdo;
				msp3400c_set_mode(client, MSP_MODE_FM_TERRA);
				state->watch_stereo = 1;
			} else if (max2 == 0 && (state->v4l2_std & V4L2_STD_SECAM)) {
				/* L NICAM or AM-mono */
				state->second = msp3400c_carrier_detect_65[max2].cdo;
				msp3400c_set_mode(client, MSP_MODE_AM_NICAM);
				msp3400c_set_carrier(client, state->second, state->main);
				/* volume prescale for SCART (AM mono input) */
				msp_write_dsp(client, 0x000d, 0x1900);
				state->watch_stereo = 1;
			} else if (max2 == 0 && state->has_nicam) {
				/* D/K NICAM */
				state->second = msp3400c_carrier_detect_65[max2].cdo;
				msp3400c_set_mode(client, MSP_MODE_FM_NICAM1);
				msp3400c_set_carrier(client, state->second, state->main);
				state->nicam_on = 1;
				state->watch_stereo = 1;
			} else {
				goto no_second;
			}
			break;
		case 0: /* 4.5 */
		default:
		no_second:
			state->second = msp3400c_carrier_detect_main[max1].cdo;
			msp3400c_set_mode(client, MSP_MODE_FM_TERRA);
			msp3400c_set_carrier(client, state->second, state->main);
			state->rxsubchans = V4L2_TUNER_SUB_MONO;
			break;
		}

		/* unmute */
		msp_set_audio(client);
		msp3400c_set_audmode(client);

		if (msp_debug)
			msp3400c_print_mode(client);

		/* monitor tv audio mode, the first time don't wait
		   so long to get a quick stereo/bilingual result */
		if (msp_sleep(state, 1000))
			goto restart;
		while (state->watch_stereo) {
			if (msp_sleep(state, 5000))
				goto restart;
			watch_stereo(client);
		}
	}
	v4l_dbg(1, msp_debug, client, "thread: exit\n");
	return 0;
}


int msp3410d_thread(void *data)
{
	struct i2c_client *client = data;
	struct msp_state *state = i2c_get_clientdata(client);
	int val, i, std;

	v4l_dbg(1, msp_debug, client, "msp3410 daemon started\n");

	for (;;) {
		v4l_dbg(2, msp_debug, client, "msp3410 thread: sleep\n");
		msp_sleep(state,-1);
		v4l_dbg(2, msp_debug, client, "msp3410 thread: wakeup\n");

	restart:
		v4l_dbg(2, msp_debug, client, "thread: restart scan\n");
		state->restart = 0;
		if (kthread_should_stop())
			break;

		if (state->mode == MSP_MODE_EXTERN) {
			/* no carrier scan needed, just unmute */
			v4l_dbg(1, msp_debug, client, "thread: no carrier scan\n");
			msp_set_audio(client);
			continue;
		}

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

		/* some time for the tuner to sync */
		if (msp_sleep(state,200))
			goto restart;

		/* start autodetect */
		if (state->radio)
			std = 0x40;
		else
			std = (state->v4l2_std & V4L2_STD_NTSC) ? 0x20 : 1;
		state->watch_stereo = 0;
		state->nicam_on = 0;

		if (msp_debug)
			v4l_dbg(2, msp_debug, client, "setting standard: %s (0x%04x)\n",
			       msp_standard_std_name(std), std);

		if (std != 1) {
			/* programmed some specific mode */
			val = std;
		} else {
			/* triggered autodetect */
			msp_write_dem(client, 0x20, std);
			for (;;) {
				if (msp_sleep(state, 100))
					goto restart;

				/* check results */
				val = msp_read_dem(client, 0x7e);
				if (val < 0x07ff)
					break;
				v4l_dbg(2, msp_debug, client, "detection still in progress\n");
			}
		}
		for (i = 0; msp_stdlist[i].name != NULL; i++)
			if (msp_stdlist[i].retval == val)
				break;
		v4l_dbg(1, msp_debug, client, "current standard: %s (0x%04x)\n",
			msp_standard_std_name(val), val);
		state->main   = msp_stdlist[i].main;
		state->second = msp_stdlist[i].second;
		state->std = val;

		if (msp_amsound && !state->radio && (state->v4l2_std & V4L2_STD_SECAM) &&
				(val != 0x0009)) {
			/* autodetection has failed, let backup */
			v4l_dbg(1, msp_debug, client, "autodetection failed,"
				" switching to backup standard: %s (0x%04x)\n",
				msp_stdlist[8].name ? msp_stdlist[8].name : "unknown",val);
			val = 0x0009;
			msp_write_dem(client, 0x20, val);
		}

		/* set various prescales */
		msp_write_dsp(client, 0x0d, 0x1900); /* scart */
		msp_write_dsp(client, 0x0e, 0x2403); /* FM */
		msp_write_dsp(client, 0x10, 0x5a00); /* nicam */

		/* set stereo */
		switch (val) {
		case 0x0008: /* B/G NICAM */
		case 0x000a: /* I NICAM */
			if (val == 0x0008)
				state->mode = MSP_MODE_FM_NICAM1;
			else
				state->mode = MSP_MODE_FM_NICAM2;
			/* just turn on stereo */
			state->rxsubchans = V4L2_TUNER_SUB_STEREO;
			state->nicam_on = 1;
			state->watch_stereo = 1;
			break;
		case 0x0009:
			state->mode = MSP_MODE_AM_NICAM;
			state->rxsubchans = V4L2_TUNER_SUB_MONO;
			state->nicam_on = 1;
			state->watch_stereo = 1;
			break;
		case 0x0020: /* BTSC */
			/* The pre-'G' models only have BTSC-mono */
			state->mode = MSP_MODE_BTSC;
			state->rxsubchans = V4L2_TUNER_SUB_MONO;
			break;
		case 0x0040: /* FM radio */
			state->mode = MSP_MODE_FM_RADIO;
			state->rxsubchans = V4L2_TUNER_SUB_STEREO;
			/* not needed in theory if we have radio, but
			   short programming enables carrier mute */
			msp3400c_set_mode(client, MSP_MODE_FM_RADIO);
			msp3400c_set_carrier(client, MSP_CARRIER(10.7),
					    MSP_CARRIER(10.7));
			/* scart routing (this doesn't belong here I think) */
			msp_set_scart(client,SCART_IN2,0);
			break;
		case 0x0003:
		case 0x0004:
		case 0x0005:
			state->mode = MSP_MODE_FM_TERRA;
			state->rxsubchans = V4L2_TUNER_SUB_MONO;
			state->watch_stereo = 1;
			break;
		}

		/* unmute, restore misc registers */
		msp_set_audio(client);
		msp_write_dsp(client, 0x13, state->acb);
		if (state->has_i2s_conf)
			msp_write_dem(client, 0x40, state->i2s_mode);

		msp3400c_set_audmode(client);

		/* monitor tv audio mode, the first time don't wait
		   so long to get a quick stereo/bilingual result */
		if (msp_sleep(state, 1000))
			goto restart;
		while (state->watch_stereo) {
			watch_stereo(client);
			if (msp_sleep(state, 5000))
				goto restart;
		}
	}
	v4l_dbg(1, msp_debug, client, "thread: exit\n");
	return 0;
}

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

/* msp34xxG + (autoselect no-thread)                                       */
/* this one uses both automatic standard detection and automatic sound     */
/* select which are available in the newer G versions                      */
/* struct msp: only norm, acb and source are really used in this mode      */

/* set the same 'source' for the loudspeaker, scart and quasi-peak detector
 * the value for source is the same as bit 15:8 of DSP registers 0x08,
 * 0x0a and 0x0c: 0=mono, 1=stereo or A|B, 2=SCART, 3=stereo or A, 4=stereo or B
 *
 * this function replaces msp3400c_set_audmode
 */
static void msp34xxg_set_source(struct i2c_client *client, int source)
{
	struct msp_state *state = i2c_get_clientdata(client);

	/* fix matrix mode to stereo and let the msp choose what
	 * to output according to 'source', as recommended
	 * for MONO (source==0) downmixing set bit[7:0] to 0x30
	 */
	int value = (source & 0x07) << 8 | (source == 0 ? 0x30 : 0x20);

	v4l_dbg(1, msp_debug, client, "set source to %d (0x%x)\n", source, value);
	msp_set_source(client, value);
	/*
	 * set identification threshold. Personally, I
	 * I set it to a higher value that the default
	 * of 0x190 to ignore noisy stereo signals.
	 * this needs tuning. (recommended range 0x00a0-0x03c0)
	 * 0x7f0 = forced mono mode
	 */
	/* a2 threshold for stereo/bilingual */
	msp_write_dem(client, 0x22, msp_stereo_thresh);
	state->source = source;
}

/* (re-)initialize the msp34xxg, according to the current norm in state->norm
 * return 0 if it worked, -1 if it failed
 */
static int msp34xxg_reset(struct i2c_client *client)
{
	struct msp_state *state = i2c_get_clientdata(client);
	int modus, std;

	if (msp_reset(client))
		return -1;

	/* make sure that input/output is muted (paranoid mode) */
	/* ACB, mute DSP input, mute SCART 1 */
	if (msp_write_dsp(client, 0x13, 0x0f20))
		return -1;

	if (state->has_i2s_conf)
		msp_write_dem(client, 0x40, state->i2s_mode);

	/* step-by-step initialisation, as described in the manual */
	modus = msp_modus(client);
	if (state->radio)
		std = 0x40;
	else
		std = (state->v4l2_std & V4L2_STD_NTSC) ? 0x20 : 1;
	modus &= ~0x03; /* STATUS_CHANGE = 0 */
	modus |= 0x01;  /* AUTOMATIC_SOUND_DETECTION = 1 */
	if (msp_write_dem(client, 0x30, modus))
		return -1;
	if (msp_write_dem(client, 0x20, std))
		return -1;

	/* write the dsps that may have an influence on
	   standard/audio autodetection right now */
	msp34xxg_set_source(client, state->source);

	/* AM/FM Prescale [15:8] 75khz deviation */
	if (msp_write_dsp(client, 0x0e, 0x3000))
		return -1;

	/* NICAM Prescale 9db gain (as recommended) */
	if (msp_write_dsp(client, 0x10, 0x5a00))
		return -1;

	return 0;
}

int msp34xxg_thread(void *data)
{
	struct i2c_client *client = data;
	struct msp_state *state = i2c_get_clientdata(client);
	int val, std, i;

	v4l_dbg(1, msp_debug, client, "msp34xxg daemon started\n");

	state->source = 1; /* default */
	for (;;) {
		v4l_dbg(2, msp_debug, client, "msp34xxg thread: sleep\n");
		msp_sleep(state, -1);
		v4l_dbg(2, msp_debug, client, "msp34xxg thread: wakeup\n");

	restart:
		v4l_dbg(1, msp_debug, client, "thread: restart scan\n");
		state->restart = 0;
		if (kthread_should_stop())
			break;

		/* setup the chip*/
		msp34xxg_reset(client);
		std = msp_standard;
		if (std != 0x01)
			goto unmute;

		/* watch autodetect */
		v4l_dbg(1, msp_debug, client, "triggered autodetect, waiting for result\n");
		for (i = 0; i < 10; i++) {
			if (msp_sleep(state, 100))
				goto restart;

			/* check results */
			val = msp_read_dem(client, 0x7e);
			if (val < 0x07ff) {
				std = val;
				break;
			}
			v4l_dbg(2, msp_debug, client, "detection still in progress\n");
		}
		if (std == 1) {
			v4l_dbg(1, msp_debug, client, "detection still in progress after 10 tries. giving up.\n");
			continue;
		}

	unmute:
		state->std = std;
		v4l_dbg(1, msp_debug, client, "current standard: %s (0x%04x)\n",
			msp_standard_std_name(std), std);

		/* unmute: dispatch sound to scart output, set scart volume */
		msp_set_audio(client);

		/* restore ACB */
		if (msp_write_dsp(client, 0x13, state->acb))
			return -1;

		if (state->has_i2s_conf)
			msp_write_dem(client, 0x40, state->i2s_mode);
	}
	v4l_dbg(1, msp_debug, client, "thread: exit\n");
	return 0;
}

static void msp34xxg_detect_stereo(struct i2c_client *client)
{
	struct msp_state *state = i2c_get_clientdata(client);

	int status = msp_read_dem(client, 0x0200);
	int is_bilingual = status & 0x100;
	int is_stereo = status & 0x40;

	state->rxsubchans = 0;
	if (is_stereo)
		state->rxsubchans = V4L2_TUNER_SUB_STEREO;
	else
		state->rxsubchans = V4L2_TUNER_SUB_MONO;
	if (is_bilingual) {
		state->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
		/* I'm supposed to check whether it's SAP or not
		 * and set only LANG2/SAP in this case. Yet, the MSP
		 * does a lot of work to hide this and handle everything
		 * the same way. I don't want to work around it so unless
		 * this is a problem, I'll handle SAP just like lang1/lang2.
		 */
	}
	v4l_dbg(1, msp_debug, client, "status=0x%x, stereo=%d, bilingual=%d -> rxsubchans=%d\n",
		status, is_stereo, is_bilingual, state->rxsubchans);
}

void msp34xxg_set_audmode(struct i2c_client *client)
{
	struct msp_state *state = i2c_get_clientdata(client);
	int source;

	switch (state->audmode) {
	case V4L2_TUNER_MODE_MONO:
		source = 0; /* mono only */
		break;
	case V4L2_TUNER_MODE_STEREO:
		source = 1; /* stereo or A|B, see comment in msp34xxg_get_v4l2_stereo() */
		/* problem: that could also mean 2 (scart input) */
		break;
	case V4L2_TUNER_MODE_LANG1:
		source = 3; /* stereo or A */
		break;
	case V4L2_TUNER_MODE_LANG2:
		source = 4; /* stereo or B */
		break;
	default:
		source  = 1;
		break;
	}
	msp34xxg_set_source(client, source);
}

void msp_set_audmode(struct i2c_client *client)
{
	struct msp_state *state = i2c_get_clientdata(client);

	switch (state->opmode) {
	case OPMODE_MANUAL:
	case OPMODE_AUTODETECT:
		state->watch_stereo = 0;
		msp3400c_set_audmode(client);
		break;
	case OPMODE_AUTOSELECT:
		msp34xxg_set_audmode(client);
		break;
	}
}

void msp_detect_stereo(struct i2c_client *client)
{
	struct msp_state *state  = i2c_get_clientdata(client);

	switch (state->opmode) {
	case OPMODE_MANUAL:
	case OPMODE_AUTODETECT:
		msp3400c_detect_stereo(client);
		break;
	case OPMODE_AUTOSELECT:
		msp34xxg_detect_stereo(client);
		break;
	}
}