// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Programming the mspx4xx sound processor family
 *
 * (c) 1997-2001 Gerd Knorr <kraxel@bytesex.org>
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/freezer.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/drv-intf/msp3400.h>
#include <linux/kthread.h>
#include <linux/suspend.h>
#include "msp3400-driver.h"

/* this one uses the automatic sound standard detection of newer msp34xx
   chip versions */
static struct {
        int retval;
        int main, second;
        char *name;
        v4l2_std_id std;
} msp_stdlist[] = {
        { 0x0000, 0, 0, "could not detect sound standard", V4L2_STD_ALL },
        { 0x0001, 0, 0, "autodetect start", V4L2_STD_ALL },
        { 0x0002, MSP_CARRIER(4.5), MSP_CARRIER(4.72),
          "4.5/4.72  M Dual FM-Stereo", V4L2_STD_MN },
        { 0x0003, MSP_CARRIER(5.5), MSP_CARRIER(5.7421875),
          "5.5/5.74  B/G Dual FM-Stereo", V4L2_STD_BG },
        { 0x0004, MSP_CARRIER(6.5), MSP_CARRIER(6.2578125),
          "6.5/6.25  D/K1 Dual FM-Stereo", V4L2_STD_DK },
        { 0x0005, MSP_CARRIER(6.5), MSP_CARRIER(6.7421875),
          "6.5/6.74  D/K2 Dual FM-Stereo", V4L2_STD_DK },
        { 0x0006, MSP_CARRIER(6.5), MSP_CARRIER(6.5),
          "6.5  D/K FM-Mono (HDEV3)", V4L2_STD_DK },
        { 0x0007, MSP_CARRIER(6.5), MSP_CARRIER(5.7421875),
          "6.5/5.74  D/K3 Dual FM-Stereo", V4L2_STD_DK },
        { 0x0008, MSP_CARRIER(5.5), MSP_CARRIER(5.85),
          "5.5/5.85  B/G NICAM FM", V4L2_STD_BG },
        { 0x0009, MSP_CARRIER(6.5), MSP_CARRIER(5.85),
          "6.5/5.85  L NICAM AM", V4L2_STD_L },
        { 0x000a, MSP_CARRIER(6.0), MSP_CARRIER(6.55),
          "6.0/6.55  I NICAM FM", V4L2_STD_PAL_I },
        { 0x000b, MSP_CARRIER(6.5), MSP_CARRIER(5.85),
          "6.5/5.85  D/K NICAM FM", V4L2_STD_DK },
        { 0x000c, MSP_CARRIER(6.5), MSP_CARRIER(5.85),
          "6.5/5.85  D/K NICAM FM (HDEV2)", V4L2_STD_DK },
        { 0x000d, MSP_CARRIER(6.5), MSP_CARRIER(5.85),
          "6.5/5.85  D/K NICAM FM (HDEV3)", V4L2_STD_DK },
        { 0x0020, MSP_CARRIER(4.5), MSP_CARRIER(4.5),
          "4.5  M BTSC-Stereo", V4L2_STD_MTS },
        { 0x0021, MSP_CARRIER(4.5), MSP_CARRIER(4.5),
          "4.5  M BTSC-Mono + SAP", V4L2_STD_MTS },
        { 0x0030, MSP_CARRIER(4.5), MSP_CARRIER(4.5),
          "4.5  M EIA-J Japan Stereo", V4L2_STD_NTSC_M_JP },
        { 0x0040, MSP_CARRIER(10.7), MSP_CARRIER(10.7),
          "10.7  FM-Stereo Radio", V4L2_STD_ALL },
        { 0x0050, MSP_CARRIER(6.5), MSP_CARRIER(6.5),
          "6.5  SAT-Mono", V4L2_STD_ALL },
        { 0x0051, MSP_CARRIER(7.02), MSP_CARRIER(7.20),
          "7.02/7.20  SAT-Stereo", V4L2_STD_ALL },
        { 0x0060, MSP_CARRIER(7.2), MSP_CARRIER(7.2),
          "7.2  SAT ADR", V4L2_STD_ALL },
        {     -1, 0, 0, NULL, 0 }, /* 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
        }, {    /* Terrestrial 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";
}

static v4l2_std_id msp_standard_std(int std)
{
        int i;

        for (i = 0; msp_stdlist[i].name != NULL; i++)
                if (msp_stdlist[i].retval == std)
                        return msp_stdlist[i].std;
        return V4L2_STD_ALL;
}

static void msp_set_source(struct i2c_client *client, u16 src)
{
        struct msp_state *state = to_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_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 = to_state(i2c_get_clientdata(client));
        struct msp3400c_init_data_dem *data = &msp3400c_init_data[mode];
        int tuner = (state->route_in >> 3) & 1;
        int i;

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

        msp_write_dem(client, 0x00bb, data->ad_cv | (tuner ? 0x100 : 0));

        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);
        /* set prescales */

        /* volume prescale for SCART (AM mono input) */
        msp_write_dsp(client, 0x000d, 0x1900);
        msp_write_dsp(client, 0x000e, data->dsp_matrix);
        if (state->has_nicam) /* nicam prescale */
                msp_write_dsp(client, 0x0010, 0x5a00);
}

/* Set audio mode. Note that the pre-'G' models do not support BTSC+SAP,
   nor do they support stereo BTSC. */
static void msp3400c_set_audmode(struct i2c_client *client)
{
        static char *strmode[] = {
                "mono", "stereo", "lang2", "lang1", "lang1+lang2"
        };
        struct msp_state *state = to_state(i2c_get_clientdata(client));
        char *modestr = (state->audmode >= 0 && state->audmode < 5) ?
                strmode[state->audmode] : "unknown";
        int src = 0;    /* channel source: FM/AM, nicam or SCART */
        int audmode = state->audmode;

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

        /* Note: for the C and D revs no NTSC stereo + SAP is possible as
           the hardware does not support SAP. So the rxsubchans combination
           of STEREO | LANG2 does not occur. */

        if (state->mode != MSP_MODE_EXTERN) {
                /* switch to mono if only mono is available */
                if (state->rxsubchans == V4L2_TUNER_SUB_MONO)
                        audmode = V4L2_TUNER_MODE_MONO;
                /* if bilingual */
                else if (state->rxsubchans & V4L2_TUNER_SUB_LANG2) {
                        /* and mono or stereo, then fallback to lang1 */
                        if (audmode == V4L2_TUNER_MODE_MONO ||
                            audmode == V4L2_TUNER_MODE_STEREO)
                                audmode = V4L2_TUNER_MODE_LANG1;
                }
                /* if stereo, and audmode is not mono, then switch to stereo */
                else if (audmode != V4L2_TUNER_MODE_MONO)
                        audmode = V4L2_TUNER_MODE_STEREO;
        }

        /* switch demodulator */
        switch (state->mode) {
        case MSP_MODE_FM_TERRA:
                dev_dbg_lvl(&client->dev, 1, msp_debug, "FM set_audmode: %s\n", modestr);
                switch (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:
                case V4L2_TUNER_MODE_LANG1_LANG2:
                        msp_write_dsp(client, 0x000e, 0x3000);
                        break;
                }
                break;
        case MSP_MODE_FM_SAT:
                dev_dbg_lvl(&client->dev, 1, msp_debug, "SAT set_audmode: %s\n", modestr);
                switch (audmode) {
                case V4L2_TUNER_MODE_MONO:
                        msp3400c_set_carrier(client, MSP_CARRIER(6.5), MSP_CARRIER(6.5));
                        break;
                case V4L2_TUNER_MODE_STEREO:
                case V4L2_TUNER_MODE_LANG1_LANG2:
                        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:
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "NICAM set_audmode: %s\n", modestr);
                if (state->nicam_on)
                        src = 0x0100;  /* NICAM */
                break;
        case MSP_MODE_BTSC:
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "BTSC set_audmode: %s\n", modestr);
                break;
        case MSP_MODE_EXTERN:
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "extern set_audmode: %s\n", modestr);
                src = 0x0200;  /* SCART */
                break;
        case MSP_MODE_FM_RADIO:
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "FM-Radio set_audmode: %s\n", modestr);
                break;
        default:
                dev_dbg_lvl(&client->dev, 1, msp_debug, "mono set_audmode\n");
                return;
        }

        /* switch audio */
        dev_dbg_lvl(&client->dev, 1, msp_debug, "set audmode %d\n", audmode);
        switch (audmode) {
        case V4L2_TUNER_MODE_STEREO:
        case V4L2_TUNER_MODE_LANG1_LANG2:
                src |= 0x0020;
                break;
        case V4L2_TUNER_MODE_MONO:
                if (state->mode == MSP_MODE_AM_NICAM) {
                        dev_dbg_lvl(&client->dev, 1, msp_debug, "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:
                break;
        case V4L2_TUNER_MODE_LANG2:
                src |= 0x0010;
                break;
        }
        dev_dbg_lvl(&client->dev, 1, msp_debug,
                "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 = to_state(i2c_get_clientdata(client));

        if (state->main == state->second)
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "mono sound carrier: %d.%03d MHz\n",
                        state->main / 910000, (state->main / 910) % 1000);
        else
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "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)
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "NICAM/FM carrier  : %d.%03d MHz\n",
                        state->second / 910000, (state->second/910) % 1000);
        if (state->mode == MSP_MODE_AM_NICAM)
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "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) {
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "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 = to_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;
                dev_dbg_lvl(&client->dev, 2, msp_debug,
                        "stereo detect register: %d\n", val);
                if (val > 8192) {
                        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);
                dev_dbg_lvl(&client->dev, 2, msp_debug, "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;
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "watch: rxsubchans %02x => %02x\n",
                        state->rxsubchans, rxsubchans);
                state->rxsubchans = rxsubchans;
        }
        if (newnicam != state->nicam_on) {
                update = 1;
                dev_dbg_lvl(&client->dev, 1, msp_debug, "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 = to_state(i2c_get_clientdata(client));

        if (msp_detect_stereo(client))
                msp_set_audmode(client);

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

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

        dev_dbg_lvl(&client->dev, 1, msp_debug, "msp3400 daemon started\n");
        state->detected_std = V4L2_STD_ALL;
        set_freezable();
        for (;;) {
                dev_dbg_lvl(&client->dev, 2, msp_debug, "msp3400 thread: sleep\n");
                msp_sleep(state, -1);
                dev_dbg_lvl(&client->dev, 2, msp_debug, "msp3400 thread: wakeup\n");

restart:
                dev_dbg_lvl(&client->dev, 2, msp_debug, "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 */
                        dev_dbg_lvl(&client->dev, 1, msp_debug,
                                "thread: no carrier scan\n");
                        state->scan_in_progress = 0;
                        msp_update_volume(state);
                        continue;
                }

                /* mute audio */
                state->scan_in_progress = 1;
                msp_update_volume(state);

                msp3400c_set_mode(client, MSP_MODE_AM_DETECT);
                val1 = val2 = 0;
                max1 = max2 = -1;
                state->watch_stereo = 0;
                state->nicam_on = 0;

                /* wait for tuner to settle down after a channel change */
                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;
                        dev_dbg_lvl(&client->dev, 1, msp_debug, "AM sound override\n");
                }

                for (i = 0; i < count; i++) {
                        msp3400c_set_carrier(client, cd[i].cdo, cd[i].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 = i;
                        }
                        dev_dbg_lvl(&client->dev, 1, msp_debug,
                                "carrier1 val: %5d / %s\n", val, cd[i].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 (i = 0; i < count; i++) {
                        msp3400c_set_carrier(client, cd[i].cdo, cd[i].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 = i;
                        }
                        dev_dbg_lvl(&client->dev, 1, msp_debug,
                                "carrier2 val: %5d / %s\n", val, cd[i].name);
                }

                if (max1 < 0 || max1 > 3)
                        goto restart;
                /* program the msp3400 according to the results */
                state->main = msp3400c_carrier_detect_main[max1].cdo;
                switch (max1) {
                case 1: /* 5.5 */
                        state->detected_std = V4L2_STD_BG | V4L2_STD_PAL_H;
                        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);
                                state->nicam_on = 1;
                                state->watch_stereo = 1;
                        } else {
                                goto no_second;
                        }
                        break;
                case 2: /* 6.0 */
                        /* PAL I NICAM */
                        state->detected_std = V4L2_STD_PAL_I;
                        state->second = MSP_CARRIER(6.552);
                        msp3400c_set_mode(client, MSP_MODE_FM_NICAM2);
                        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;
                                state->detected_std = V4L2_STD_DK;
                        } 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);
                                state->watch_stereo = 1;
                                state->detected_std = V4L2_STD_L;
                        } 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);
                                state->nicam_on = 1;
                                state->watch_stereo = 1;
                                state->detected_std = V4L2_STD_DK;
                        } else {
                                goto no_second;
                        }
                        break;
                case 0: /* 4.5 */
                        state->detected_std = V4L2_STD_MN;
                        fallthrough;
                default:
no_second:
                        state->second = msp3400c_carrier_detect_main[max1].cdo;
                        msp3400c_set_mode(client, MSP_MODE_FM_TERRA);
                        break;
                }
                msp3400c_set_carrier(client, state->second, state->main);

                /* unmute */
                state->scan_in_progress = 0;
                msp3400c_set_audmode(client);
                msp_update_volume(state);

                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 */
                count = 3;
                while (state->watch_stereo) {
                        if (msp_sleep(state, count ? 1000 : 5000))
                                goto restart;
                        if (count)
                                count--;
                        watch_stereo(client);
                }
        }
        dev_dbg_lvl(&client->dev, 1, msp_debug, "thread: exit\n");
        return 0;
}


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

        dev_dbg_lvl(&client->dev, 1, msp_debug, "msp3410 daemon started\n");
        state->detected_std = V4L2_STD_ALL;
        set_freezable();
        for (;;) {
                dev_dbg_lvl(&client->dev, 2, msp_debug, "msp3410 thread: sleep\n");
                msp_sleep(state, -1);
                dev_dbg_lvl(&client->dev, 2, msp_debug, "msp3410 thread: wakeup\n");

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

                if (state->mode == MSP_MODE_EXTERN) {
                        /* no carrier scan needed, just unmute */
                        dev_dbg_lvl(&client->dev, 1, msp_debug,
                                "thread: no carrier scan\n");
                        state->scan_in_progress = 0;
                        msp_update_volume(state);
                        continue;
                }

                /* mute audio */
                state->scan_in_progress = 1;
                msp_update_volume(state);

                /* start autodetect. Note: autodetect is not supported for
                   NTSC-M and radio, hence we force the standard in those
                   cases. */
                if (state->radio)
                        std = 0x40;
                else
                        std = (state->v4l2_std & V4L2_STD_NTSC) ? 0x20 : 1;
                state->watch_stereo = 0;
                state->nicam_on = 0;

                /* wait for tuner to settle down after a channel change */
                if (msp_sleep(state, 200))
                        goto restart;

                if (msp_debug)
                        dev_dbg_lvl(&client->dev, 2, msp_debug,
                                "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;
                                dev_dbg_lvl(&client->dev, 2, msp_debug,
                                        "detection still in progress\n");
                        }
                }
                for (i = 0; msp_stdlist[i].name != NULL; i++)
                        if (msp_stdlist[i].retval == val)
                                break;
                dev_dbg_lvl(&client->dev, 1, msp_debug, "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;
                state->rxsubchans = V4L2_TUNER_SUB_MONO;

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

                /* set stereo */
                switch (val) {
                case 0x0008: /* B/G NICAM */
                case 0x000a: /* I NICAM */
                case 0x000b: /* D/K NICAM */
                        if (val == 0x000a)
                                state->mode = MSP_MODE_FM_NICAM2;
                        else
                                state->mode = MSP_MODE_FM_NICAM1;
                        /* just turn on stereo */
                        state->nicam_on = 1;
                        state->watch_stereo = 1;
                        break;
                case 0x0009:
                        state->mode = MSP_MODE_AM_NICAM;
                        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;
                        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));
                        break;
                case 0x0002:
                case 0x0003:
                case 0x0004:
                case 0x0005:
                        state->mode = MSP_MODE_FM_TERRA;
                        state->watch_stereo = 1;
                        break;
                }

                /* set various prescales */
                msp_write_dsp(client, 0x0d, 0x1900); /* scart */
                msp_write_dsp(client, 0x0e, 0x3000); /* FM */
                if (state->has_nicam)
                        msp_write_dsp(client, 0x10, 0x5a00); /* nicam */

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

                /* unmute */
                msp3400c_set_audmode(client);
                state->scan_in_progress = 0;
                msp_update_volume(state);

                /* monitor tv audio mode, the first time don't wait
                   so long to get a quick stereo/bilingual result */
                count = 3;
                while (state->watch_stereo) {
                        if (msp_sleep(state, count ? 1000 : 5000))
                                goto restart;
                        if (count)
                                count--;
                        watch_stereo(client);
                }
        }
        dev_dbg_lvl(&client->dev, 1, msp_debug, "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
 */

static int msp34xxg_modus(struct i2c_client *client)
{
        struct msp_state *state = to_state(i2c_get_clientdata(client));

        if (state->radio) {
                dev_dbg_lvl(&client->dev, 1, msp_debug, "selected radio modus\n");
                return 0x0001;
        }
        if (state->v4l2_std == V4L2_STD_NTSC_M_JP) {
                dev_dbg_lvl(&client->dev, 1, msp_debug, "selected M (EIA-J) modus\n");
                return 0x4001;
        }
        if (state->v4l2_std == V4L2_STD_NTSC_M_KR) {
                dev_dbg_lvl(&client->dev, 1, msp_debug, "selected M (A2) modus\n");
                return 0x0001;
        }
        if (state->v4l2_std == V4L2_STD_SECAM_L) {
                dev_dbg_lvl(&client->dev, 1, msp_debug, "selected SECAM-L modus\n");
                return 0x6001;
        }
        if (state->v4l2_std & V4L2_STD_MN) {
                dev_dbg_lvl(&client->dev, 1, msp_debug, "selected M (BTSC) modus\n");
                return 0x2001;
        }
        return 0x7001;
}

static void msp34xxg_set_source(struct i2c_client *client, u16 reg, int in)
{
        struct msp_state *state = to_state(i2c_get_clientdata(client));
        int source, matrix;

        switch (state->audmode) {
        case V4L2_TUNER_MODE_MONO:
                source = 0; /* mono only */
                matrix = 0x30;
                break;
        case V4L2_TUNER_MODE_LANG2:
                source = 4; /* stereo or B */
                matrix = 0x10;
                break;
        case V4L2_TUNER_MODE_LANG1_LANG2:
                source = 1; /* stereo or A|B */
                matrix = 0x20;
                break;
        case V4L2_TUNER_MODE_LANG1:
                source = 3; /* stereo or A */
                matrix = 0x00;
                break;
        case V4L2_TUNER_MODE_STEREO:
        default:
                source = 3; /* stereo or A */
                matrix = 0x20;
                break;
        }

        if (in == MSP_DSP_IN_TUNER)
                source = (source << 8) | 0x20;
        /* the msp34x2g puts the MAIN_AVC, MAIN and AUX sources in 12, 13, 14
           instead of 11, 12, 13. So we add one for that msp version. */
        else if (in >= MSP_DSP_IN_MAIN_AVC && state->has_dolby_pro_logic)
                source = ((in + 1) << 8) | matrix;
        else
                source = (in << 8) | matrix;

        dev_dbg_lvl(&client->dev, 1, msp_debug,
                "set source to %d (0x%x) for output %02x\n", in, source, reg);
        msp_write_dsp(client, reg, source);
}

static void msp34xxg_set_sources(struct i2c_client *client)
{
        struct msp_state *state = to_state(i2c_get_clientdata(client));
        u32 in = state->route_in;

        msp34xxg_set_source(client, 0x0008, (in >> 4) & 0xf);
        /* quasi-peak detector is set to same input as the loudspeaker (MAIN) */
        msp34xxg_set_source(client, 0x000c, (in >> 4) & 0xf);
        msp34xxg_set_source(client, 0x0009, (in >> 8) & 0xf);
        msp34xxg_set_source(client, 0x000a, (in >> 12) & 0xf);
        if (state->has_scart2_out)
                msp34xxg_set_source(client, 0x0041, (in >> 16) & 0xf);
        msp34xxg_set_source(client, 0x000b, (in >> 20) & 0xf);
}

/* (re-)initialize the msp34xxg */
static void msp34xxg_reset(struct i2c_client *client)
{
        struct msp_state *state = to_state(i2c_get_clientdata(client));
        int tuner = (state->route_in >> 3) & 1;
        int modus;

        /* initialize std to 1 (autodetect) to signal that no standard is
           selected yet. */
        state->std = 1;

        msp_reset(client);

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

        /* step-by-step initialisation, as described in the manual */
        modus = msp34xxg_modus(client);
        modus |= tuner ? 0x100 : 0;
        msp_write_dem(client, 0x30, modus);

        /* write the dsps that may have an influence on
           standard/audio autodetection right now */
        msp34xxg_set_sources(client);

        msp_write_dsp(client, 0x0d, 0x1900); /* scart */
        msp_write_dsp(client, 0x0e, 0x3000); /* FM */
        if (state->has_nicam)
                msp_write_dsp(client, 0x10, 0x5a00); /* nicam */

        /* set identification threshold. Personally, I
         * I set it to a higher value than 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.
         * Note: this register is part of the Manual/Compatibility mode.
         * It is supported by all 'G'-family chips.
         */
        msp_write_dem(client, 0x22, msp_stereo_thresh);
}

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

        dev_dbg_lvl(&client->dev, 1, msp_debug, "msp34xxg daemon started\n");
        state->detected_std = V4L2_STD_ALL;
        set_freezable();
        for (;;) {
                dev_dbg_lvl(&client->dev, 2, msp_debug, "msp34xxg thread: sleep\n");
                msp_sleep(state, -1);
                dev_dbg_lvl(&client->dev, 2, msp_debug, "msp34xxg thread: wakeup\n");

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

                if (state->mode == MSP_MODE_EXTERN) {
                        /* no carrier scan needed, just unmute */
                        dev_dbg_lvl(&client->dev, 1, msp_debug,
                                "thread: no carrier scan\n");
                        state->scan_in_progress = 0;
                        msp_update_volume(state);
                        continue;
                }

                /* setup the chip*/
                msp34xxg_reset(client);
                state->std = state->radio ? 0x40 :
                        (state->force_btsc && msp_standard == 1) ? 32 : msp_standard;
                msp_write_dem(client, 0x20, state->std);
                /* start autodetect */
                if (state->std != 1)
                        goto unmute;

                /* watch autodetect */
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "started 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) {
                                state->std = val;
                                break;
                        }
                        dev_dbg_lvl(&client->dev, 2, msp_debug,
                                "detection still in progress\n");
                }
                if (state->std == 1) {
                        dev_dbg_lvl(&client->dev, 1, msp_debug,
                                "detection still in progress after 10 tries. giving up.\n");
                        continue;
                }

unmute:
                dev_dbg_lvl(&client->dev, 1, msp_debug,
                        "detected standard: %s (0x%04x)\n",
                        msp_standard_std_name(state->std), state->std);
                state->detected_std = msp_standard_std(state->std);

                if (state->std == 9) {
                        /* AM NICAM mode */
                        msp_write_dsp(client, 0x0e, 0x7c00);
                }

                /* unmute: dispatch sound to scart output, set scart volume */
                msp_update_volume(state);

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

                /* the periodic stereo/SAP check is only relevant for
                   the 0x20 standard (BTSC) */
                if (state->std != 0x20)
                        continue;

                state->watch_stereo = 1;

                /* monitor tv audio mode, the first time don't wait
                   in order to get a quick stereo/SAP update */
                watch_stereo(client);
                while (state->watch_stereo) {
                        watch_stereo(client);
                        if (msp_sleep(state, 5000))
                                goto restart;
                }
        }
        dev_dbg_lvl(&client->dev, 1, msp_debug, "thread: exit\n");
        return 0;
}

static int msp34xxg_detect_stereo(struct i2c_client *client)
{
        struct msp_state *state = to_state(i2c_get_clientdata(client));
        int status = msp_read_dem(client, 0x0200);
        int is_bilingual = status & 0x100;
        int is_stereo = status & 0x40;
        int oldrx = state->rxsubchans;

        if (state->mode == MSP_MODE_EXTERN)
                return 0;

        state->rxsubchans = 0;
        if (is_stereo)
                state->rxsubchans = V4L2_TUNER_SUB_STEREO;
        else
                state->rxsubchans = V4L2_TUNER_SUB_MONO;
        if (is_bilingual) {
                if (state->std == 0x20)
                        state->rxsubchans |= V4L2_TUNER_SUB_SAP;
                else
                        state->rxsubchans =
                                V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
        }
        dev_dbg_lvl(&client->dev, 1, msp_debug,
                "status=0x%x, stereo=%d, bilingual=%d -> rxsubchans=%d\n",
                status, is_stereo, is_bilingual, state->rxsubchans);
        return (oldrx != state->rxsubchans);
}

static void msp34xxg_set_audmode(struct i2c_client *client)
{
        struct msp_state *state = to_state(i2c_get_clientdata(client));

        if (state->std == 0x20) {
               if ((state->rxsubchans & V4L2_TUNER_SUB_SAP) &&
                   (state->audmode == V4L2_TUNER_MODE_LANG1_LANG2 ||
                    state->audmode == V4L2_TUNER_MODE_LANG2)) {
                        msp_write_dem(client, 0x20, 0x21);
               } else {
                        msp_write_dem(client, 0x20, 0x20);
               }
        }

        msp34xxg_set_sources(client);
}

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

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

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

        switch (state->opmode) {
        case OPMODE_MANUAL:
        case OPMODE_AUTODETECT:
                return msp3400c_detect_stereo(client);
        case OPMODE_AUTOSELECT:
                return msp34xxg_detect_stereo(client);
        }
        return 0;
}