// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
 *
 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
 *
 * Portions Copyright (c) 2001 Matrox Graphics Inc.
 *
 * Version: 1.65 2002/08/14
 *
 * See matroxfb_base.c for contributors.
 *
 */

#include "matroxfb_maven.h"
#include "matroxfb_misc.h"
#include "matroxfb_DAC1064.h"
#include <linux/i2c.h>
#include <linux/matroxfb.h>
#include <linux/slab.h>
#include <asm/div64.h>

#define MGATVO_B        1
#define MGATVO_C        2

static const struct maven_gamma {
  unsigned char reg83;
  unsigned char reg84;
  unsigned char reg85;
  unsigned char reg86;
  unsigned char reg87;
  unsigned char reg88;
  unsigned char reg89;
  unsigned char reg8a;
  unsigned char reg8b;
} maven_gamma[] = {
  { 131, 57, 223, 15, 117, 212, 251, 91, 156},
  { 133, 61, 128, 63, 180, 147, 195, 100, 180},
  { 131, 19, 63, 31, 50, 66, 171, 64, 176},
  { 0, 0, 0, 31, 16, 16, 16, 100, 200},
  { 8, 23, 47, 73, 147, 244, 220, 80, 195},
  { 22, 43, 64, 80, 147, 115, 58, 85, 168},
  { 34, 60, 80, 214, 147, 212, 188, 85, 167},
  { 45, 77, 96, 216, 147, 99, 91, 85, 159},
  { 56, 76, 112, 107, 147, 212, 148, 64, 144},
  { 65, 91, 128, 137, 147, 196, 17, 69, 148},
  { 72, 104, 136, 138, 147, 180, 245, 73, 147},
  { 87, 116, 143, 126, 16, 83, 229, 77, 144},
  { 95, 119, 152, 254, 244, 83, 221, 77, 151},
  { 100, 129, 159, 156, 244, 148, 197, 77, 160},
  { 105, 141, 167, 247, 244, 132, 181, 84, 166},
  { 105, 147, 168, 247, 244, 245, 181, 90, 170},
  { 120, 153, 175, 248, 212, 229, 165, 90, 180},
  { 119, 156, 176, 248, 244, 229, 84, 74, 160},
  { 119, 158, 183, 248, 244, 229, 149, 78, 165}
};

/* Definition of the various controls */
struct mctl {
        struct v4l2_queryctrl desc;
        size_t control;
};

#define BLMIN   0x0FF
#define WLMAX   0x3FF

static const struct mctl maven_controls[] =
{       { { V4L2_CID_BRIGHTNESS, V4L2_CTRL_TYPE_INTEGER,
          "brightness",
          0, WLMAX - BLMIN, 1, 379 - BLMIN, 
          0,
        }, offsetof(struct matrox_fb_info, altout.tvo_params.brightness) },
        { { V4L2_CID_CONTRAST, V4L2_CTRL_TYPE_INTEGER,
          "contrast",
          0, 1023, 1, 127,
          0,
        }, offsetof(struct matrox_fb_info, altout.tvo_params.contrast) },
        { { V4L2_CID_SATURATION, V4L2_CTRL_TYPE_INTEGER,
          "saturation",
          0, 255, 1, 155,
          0,
        }, offsetof(struct matrox_fb_info, altout.tvo_params.saturation) },
        { { V4L2_CID_HUE, V4L2_CTRL_TYPE_INTEGER,
          "hue",
          0, 255, 1, 0,
          0,
        }, offsetof(struct matrox_fb_info, altout.tvo_params.hue) },
        { { V4L2_CID_GAMMA, V4L2_CTRL_TYPE_INTEGER,
          "gamma",
          0, ARRAY_SIZE(maven_gamma) - 1, 1, 3,
          0,
        }, offsetof(struct matrox_fb_info, altout.tvo_params.gamma) },
        { { MATROXFB_CID_TESTOUT, V4L2_CTRL_TYPE_BOOLEAN,
          "test output",
          0, 1, 1, 0,
          0,
        }, offsetof(struct matrox_fb_info, altout.tvo_params.testout) },
        { { MATROXFB_CID_DEFLICKER, V4L2_CTRL_TYPE_INTEGER,
          "deflicker mode",
          0, 2, 1, 0,
          0,
        }, offsetof(struct matrox_fb_info, altout.tvo_params.deflicker) },

};

#define MAVCTRLS ARRAY_SIZE(maven_controls)

/* Return: positive number: id found
           -EINVAL:         id not found, return failure
           -ENOENT:         id not found, create fake disabled control */
static int get_ctrl_id(__u32 v4l2_id) {
        int i;

        for (i = 0; i < MAVCTRLS; i++) {
                if (v4l2_id < maven_controls[i].desc.id) {
                        if (maven_controls[i].desc.id == 0x08000000) {
                                return -EINVAL;
                        }
                        return -ENOENT;
                }
                if (v4l2_id == maven_controls[i].desc.id) {
                        return i;
                }
        }
        return -EINVAL;
}

struct maven_data {
        struct matrox_fb_info*          primary_head;
        struct i2c_client               *client;
        int                             version;
};

static int* get_ctrl_ptr(struct maven_data* md, int idx) {
        return (int*)((char*)(md->primary_head) + maven_controls[idx].control);
}

static int maven_get_reg(struct i2c_client* c, char reg) {
        char dst;
        struct i2c_msg msgs[] = {
                {
                        .addr = c->addr,
                        .flags = I2C_M_REV_DIR_ADDR,
                        .len = sizeof(reg),
                        .buf = &reg
                },
                {
                        .addr = c->addr,
                        .flags = I2C_M_RD | I2C_M_NOSTART,
                        .len = sizeof(dst),
                        .buf = &dst
                }
        };
        s32 err;

        err = i2c_transfer(c->adapter, msgs, 2);
        if (err < 0)
                printk(KERN_INFO "ReadReg(%d) failed\n", reg);
        return dst & 0xFF;
}

static int maven_set_reg(struct i2c_client* c, int reg, int val) {
        s32 err;

        err = i2c_smbus_write_byte_data(c, reg, val);
        if (err)
                printk(KERN_INFO "WriteReg(%d) failed\n", reg);
        return err;
}

static int maven_set_reg_pair(struct i2c_client* c, int reg, int val) {
        s32 err;

        err = i2c_smbus_write_word_data(c, reg, val);
        if (err)
                printk(KERN_INFO "WriteRegPair(%d) failed\n", reg);
        return err;
}

static const struct matrox_pll_features maven_pll = {
        50000,
        27000,
        4, 127,
        2, 31,
        3
};

struct matrox_pll_features2 {
        unsigned int    vco_freq_min;
        unsigned int    vco_freq_max;
        unsigned int    feed_div_min;
        unsigned int    feed_div_max;
        unsigned int    in_div_min;
        unsigned int    in_div_max;
        unsigned int    post_shift_max;
};

struct matrox_pll_ctl {
        unsigned int    ref_freq;
        unsigned int    den;
};

static const struct matrox_pll_features2 maven1000_pll = {
        .vco_freq_min = 50000000,
        .vco_freq_max = 300000000,
        .feed_div_min = 5,
        .feed_div_max = 128,
        .in_div_min = 3,
        .in_div_max = 32,
        .post_shift_max = 3
};

static const struct matrox_pll_ctl maven_PAL = {
        .ref_freq = 540000,
        .den = 50
};

static const struct matrox_pll_ctl maven_NTSC = {
        .ref_freq = 450450,     /* 27027000/60 == 27000000/59.94005994 */
        .den = 60
};

static int matroxfb_PLL_mavenclock(const struct matrox_pll_features2* pll,
                const struct matrox_pll_ctl* ctl,
                unsigned int htotal, unsigned int vtotal,
                unsigned int* in, unsigned int* feed, unsigned int* post,
                unsigned int* h2) {
        unsigned int besth2 = 0;
        unsigned int fxtal = ctl->ref_freq;
        unsigned int fmin = pll->vco_freq_min / ctl->den;
        unsigned int fwant;
        unsigned int p;
        unsigned int scrlen;
        unsigned int fmax;

        DBG(__func__)

        scrlen = htotal * (vtotal - 1);
        fwant = htotal * vtotal;
        fmax = pll->vco_freq_max / ctl->den;

        dprintk(KERN_DEBUG "want: %u, xtal: %u, h: %u, v: %u, fmax: %u\n",
                fwant, fxtal, htotal, vtotal, fmax);
        for (p = 1; p <= pll->post_shift_max; p++) {
                if (fwant * 2 > fmax)
                        break;
                fwant *= 2;
        }
        if (fwant > fmax)
                return 0;
        for (; p-- > 0; fwant >>= 1) {
                unsigned int m;

                if (fwant < fmin) break;
                for (m = pll->in_div_min; m <= pll->in_div_max; m++) {
                        unsigned int n;
                        unsigned int dvd;
                        unsigned int ln;

                        n = (fwant * m) / fxtal;
                        if (n < pll->feed_div_min)
                                continue;
                        if (n > pll->feed_div_max)
                                break;

                        ln = fxtal * n;
                        dvd = m << p;

                        if (ln % dvd)
                                continue;
                        ln = ln / dvd;

                        if (ln < scrlen + 2)
                                continue;
                        ln = ln - scrlen;
                        if (ln > htotal)
                                continue;
                        dprintk(KERN_DEBUG "Match: %u / %u / %u / %u\n", n, m, p, ln);
                        if (ln > besth2) {
                                dprintk(KERN_DEBUG "Better...\n");
                                *h2 = besth2 = ln;
                                *post = p;
                                *in = m;
                                *feed = n;
                        }
                }
        }

        /* if h2/post/in/feed have not been assigned, return zero (error) */
        if (besth2 < 2)
                return 0;

        dprintk(KERN_ERR "clk: %02X %02X %02X %d %d\n", *in, *feed, *post, fxtal, fwant);
        return fxtal * (*feed) / (*in) * ctl->den;
}

static int matroxfb_mavenclock(const struct matrox_pll_ctl *ctl,
                unsigned int htotal, unsigned int vtotal,
                unsigned int* in, unsigned int* feed, unsigned int* post,
                unsigned int* htotal2) {
        unsigned int fvco;
        unsigned int uninitialized_var(p);

        fvco = matroxfb_PLL_mavenclock(&maven1000_pll, ctl, htotal, vtotal, in, feed, &p, htotal2);
        if (!fvco)
                return -EINVAL;
        p = (1 << p) - 1;
        if (fvco <= 100000000)
                ;
        else if (fvco <= 140000000)
                p |= 0x08;
        else if (fvco <= 180000000)
                p |= 0x10;
        else
                p |= 0x18;
        *post = p;
        return 0;
}

static void DAC1064_calcclock(unsigned int freq, unsigned int fmax,
                unsigned int* in, unsigned int* feed, unsigned int* post) {
        unsigned int fvco;
        unsigned int p;

        fvco = matroxfb_PLL_calcclock(&maven_pll, freq, fmax, in, feed, &p);
        p = (1 << p) - 1;
        if (fvco <= 100000)
                ;
        else if (fvco <= 140000)
                p |= 0x08;
        else if (fvco <= 180000)
                p |= 0x10;
        else
                p |= 0x18;
        *post = p;
        return;
}

static unsigned char maven_compute_deflicker (const struct maven_data* md) {
        unsigned char df;
        
        df = (md->version == MGATVO_B?0x40:0x00);
        switch (md->primary_head->altout.tvo_params.deflicker) {
                case 0:
/*                      df |= 0x00; */
                        break;
                case 1:
                        df |= 0xB1;
                        break;
                case 2:
                        df |= 0xA2;
                        break;
        }
        return df;
}

static void maven_compute_bwlevel (const struct maven_data* md,
                                   int *bl, int *wl) {
        const int b = md->primary_head->altout.tvo_params.brightness + BLMIN;
        const int c = md->primary_head->altout.tvo_params.contrast;

        *bl = max(b - c, BLMIN);
        *wl = min(b + c, WLMAX);
}

static const struct maven_gamma* maven_compute_gamma (const struct maven_data* md) {
        return maven_gamma + md->primary_head->altout.tvo_params.gamma;
}


static void maven_init_TVdata(const struct maven_data* md, struct mavenregs* data) {
        static struct mavenregs palregs = { {
                0x2A, 0x09, 0x8A, 0xCB, /* 00: chroma subcarrier */
                0x00,
                0x00,   /* ? not written */
                0x00,   /* modified by code (F9 written...) */
                0x00,   /* ? not written */
                0x7E,   /* 08 */
                0x44,   /* 09 */
                0x9C,   /* 0A */
                0x2E,   /* 0B */
                0x21,   /* 0C */
                0x00,   /* ? not written */
                0x3F, 0x03, /* 0E-0F */
                0x3F, 0x03, /* 10-11 */
                0x1A,   /* 12 */
                0x2A,   /* 13 */
                0x1C, 0x3D, 0x14, /* 14-16 */
                0x9C, 0x01, /* 17-18 */
                0x00,   /* 19 */
                0xFE,   /* 1A */
                0x7E,   /* 1B */
                0x60,   /* 1C */
                0x05,   /* 1D */
                0x89, 0x03, /* 1E-1F */
                0x72,   /* 20 */
                0x07,   /* 21 */
                0x72,   /* 22 */
                0x00,   /* 23 */
                0x00,   /* 24 */
                0x00,   /* 25 */
                0x08,   /* 26 */
                0x04,   /* 27 */
                0x00,   /* 28 */
                0x1A,   /* 29 */
                0x55, 0x01, /* 2A-2B */
                0x26,   /* 2C */
                0x07, 0x7E, /* 2D-2E */
                0x02, 0x54, /* 2F-30 */
                0xB0, 0x00, /* 31-32 */
                0x14,   /* 33 */
                0x49,   /* 34 */
                0x00,   /* 35 written multiple times */
                0x00,   /* 36 not written */
                0xA3,   /* 37 */
                0xC8,   /* 38 */
                0x22,   /* 39 */
                0x02,   /* 3A */
                0x22,   /* 3B */
                0x3F, 0x03, /* 3C-3D */
                0x00,   /* 3E written multiple times */
                0x00,   /* 3F not written */
        }, MATROXFB_OUTPUT_MODE_PAL, 625, 50 };
        static struct mavenregs ntscregs = { {
                0x21, 0xF0, 0x7C, 0x1F, /* 00: chroma subcarrier */
                0x00,
                0x00,   /* ? not written */
                0x00,   /* modified by code (F9 written...) */
                0x00,   /* ? not written */
                0x7E,   /* 08 */
                0x43,   /* 09 */
                0x7E,   /* 0A */
                0x3D,   /* 0B */
                0x00,   /* 0C */
                0x00,   /* ? not written */
                0x41, 0x00, /* 0E-0F */
                0x3C, 0x00, /* 10-11 */
                0x17,   /* 12 */
                0x21,   /* 13 */
                0x1B, 0x1B, 0x24, /* 14-16 */
                0x83, 0x01, /* 17-18 */
                0x00,   /* 19 */
                0x0F,   /* 1A */
                0x0F,   /* 1B */
                0x60,   /* 1C */
                0x05,   /* 1D */
                0x89, 0x02, /* 1E-1F */
                0x5F,   /* 20 */
                0x04,   /* 21 */
                0x5F,   /* 22 */
                0x01,   /* 23 */
                0x02,   /* 24 */
                0x00,   /* 25 */
                0x0A,   /* 26 */
                0x05,   /* 27 */
                0x00,   /* 28 */
                0x10,   /* 29 */
                0xFF, 0x03, /* 2A-2B */
                0x24,   /* 2C */
                0x0F, 0x78, /* 2D-2E */
                0x00, 0x00, /* 2F-30 */
                0xB2, 0x04, /* 31-32 */
                0x14,   /* 33 */
                0x02,   /* 34 */
                0x00,   /* 35 written multiple times */
                0x00,   /* 36 not written */
                0xA3,   /* 37 */
                0xC8,   /* 38 */
                0x15,   /* 39 */
                0x05,   /* 3A */
                0x3B,   /* 3B */
                0x3C, 0x00, /* 3C-3D */
                0x00,   /* 3E written multiple times */
                0x00,   /* never written */
        }, MATROXFB_OUTPUT_MODE_NTSC, 525, 60 };
        struct matrox_fb_info *minfo = md->primary_head;

        if (minfo->outputs[1].mode == MATROXFB_OUTPUT_MODE_PAL)
                *data = palregs;
        else
                *data = ntscregs;

        /* Set deflicker */
        data->regs[0x93] = maven_compute_deflicker(md);
 
        /* set gamma */
        {
                const struct maven_gamma* g;
                g = maven_compute_gamma(md);
                data->regs[0x83] = g->reg83;
                data->regs[0x84] = g->reg84;
                data->regs[0x85] = g->reg85;
                data->regs[0x86] = g->reg86;
                data->regs[0x87] = g->reg87;
                data->regs[0x88] = g->reg88;
                data->regs[0x89] = g->reg89;
                data->regs[0x8A] = g->reg8a;
                data->regs[0x8B] = g->reg8b;
        }
 
        /* Set contrast / brightness */
        {
                int bl, wl;
                maven_compute_bwlevel (md, &bl, &wl);
                data->regs[0x0e] = bl >> 2;
                data->regs[0x0f] = bl & 3;
                data->regs[0x1e] = wl >> 2;
                data->regs[0x1f] = wl & 3;
        }

        /* Set saturation */
        {
                data->regs[0x20] =
                data->regs[0x22] = minfo->altout.tvo_params.saturation;
        }
 
        /* Set HUE */
        data->regs[0x25] = minfo->altout.tvo_params.hue;
        return;
}

#define LR(x) maven_set_reg(c, (x), m->regs[(x)])
#define LRP(x) maven_set_reg_pair(c, (x), m->regs[(x)] | (m->regs[(x)+1] << 8))
static void maven_init_TV(struct i2c_client* c, const struct mavenregs* m) {
        int val;


        maven_set_reg(c, 0x3E, 0x01);
        maven_get_reg(c, 0x82); /* fetch oscillator state? */
        maven_set_reg(c, 0x8C, 0x00);
        maven_get_reg(c, 0x94); /* get 0x82 */
        maven_set_reg(c, 0x94, 0xA2);
        /* xmiscctrl */

        maven_set_reg_pair(c, 0x8E, 0x1EFF);
        maven_set_reg(c, 0xC6, 0x01);

        /* removed code... */

        maven_get_reg(c, 0x06);
        maven_set_reg(c, 0x06, 0xF9);   /* or read |= 0xF0 ? */

        /* removed code here... */

        /* real code begins here? */
        /* chroma subcarrier */
        LR(0x00); LR(0x01); LR(0x02); LR(0x03);

        LR(0x04);

        LR(0x2C);
        LR(0x08);
        LR(0x0A);
        LR(0x09);
        LR(0x29);
        LRP(0x31);
        LRP(0x17);
        LR(0x0B);
        LR(0x0C);
        if (m->mode == MATROXFB_OUTPUT_MODE_PAL) {
                maven_set_reg(c, 0x35, 0x10); /* ... */
        } else {
                maven_set_reg(c, 0x35, 0x0F); /* ... */
        }

        LRP(0x10);

        LRP(0x0E);
        LRP(0x1E);

        LR(0x20);       /* saturation #1 */
        LR(0x22);       /* saturation #2 */
        LR(0x25);       /* hue */
        LR(0x34);
        LR(0x33);
        LR(0x19);
        LR(0x12);
        LR(0x3B);
        LR(0x13);
        LR(0x39);
        LR(0x1D);
        LR(0x3A);
        LR(0x24);
        LR(0x14);
        LR(0x15);
        LR(0x16);
        LRP(0x2D);
        LRP(0x2F);
        LR(0x1A);
        LR(0x1B);
        LR(0x1C);
        LR(0x23);
        LR(0x26);
        LR(0x28);
        LR(0x27);
        LR(0x21);
        LRP(0x2A);
        if (m->mode == MATROXFB_OUTPUT_MODE_PAL)
                maven_set_reg(c, 0x35, 0x1D);   /* ... */
        else
                maven_set_reg(c, 0x35, 0x1C);

        LRP(0x3C);
        LR(0x37);
        LR(0x38);
        maven_set_reg(c, 0xB3, 0x01);

        maven_get_reg(c, 0xB0); /* read 0x80 */
        maven_set_reg(c, 0xB0, 0x08);   /* ugh... */
        maven_get_reg(c, 0xB9); /* read 0x7C */
        maven_set_reg(c, 0xB9, 0x78);
        maven_get_reg(c, 0xBF); /* read 0x00 */
        maven_set_reg(c, 0xBF, 0x02);
        maven_get_reg(c, 0x94); /* read 0x82 */
        maven_set_reg(c, 0x94, 0xB3);

        LR(0x80); /* 04 1A 91 or 05 21 91 */
        LR(0x81);
        LR(0x82);

        maven_set_reg(c, 0x8C, 0x20);
        maven_get_reg(c, 0x8D);
        maven_set_reg(c, 0x8D, 0x10);

        LR(0x90); /* 4D 50 52 or 4E 05 45 */
        LR(0x91);
        LR(0x92);

        LRP(0x9A); /* 0049 or 004F */
        LRP(0x9C); /* 0004 or 0004 */
        LRP(0x9E); /* 0458 or 045E */
        LRP(0xA0); /* 05DA or 051B */
        LRP(0xA2); /* 00CC or 00CF */
        LRP(0xA4); /* 007D or 007F */
        LRP(0xA6); /* 007C or 007E */
        LRP(0xA8); /* 03CB or 03CE */
        LRP(0x98); /* 0000 or 0000 */
        LRP(0xAE); /* 0044 or 003A */
        LRP(0x96); /* 05DA or 051B */
        LRP(0xAA); /* 04BC or 046A */
        LRP(0xAC); /* 004D or 004E */

        LR(0xBE);
        LR(0xC2);

        maven_get_reg(c, 0x8D);
        maven_set_reg(c, 0x8D, 0x04);

        LR(0x20);       /* saturation #1 */
        LR(0x22);       /* saturation #2 */
        LR(0x93);       /* whoops */
        LR(0x20);       /* oh, saturation #1 again */
        LR(0x22);       /* oh, saturation #2 again */
        LR(0x25);       /* hue */
        LRP(0x0E);
        LRP(0x1E);
        LRP(0x0E);      /* problems with memory? */
        LRP(0x1E);      /* yes, matrox must have problems in memory area... */

        /* load gamma correction stuff */
        LR(0x83);
        LR(0x84);
        LR(0x85);
        LR(0x86);
        LR(0x87);
        LR(0x88);
        LR(0x89);
        LR(0x8A);
        LR(0x8B);

        val = maven_get_reg(c, 0x8D);
        val &= 0x14;                    /* 0x10 or anything ored with it */
        maven_set_reg(c, 0x8D, val);

        LR(0x33);
        LR(0x19);
        LR(0x12);
        LR(0x3B);
        LR(0x13);
        LR(0x39);
        LR(0x1D);
        LR(0x3A);
        LR(0x24);
        LR(0x14);
        LR(0x15);
        LR(0x16);
        LRP(0x2D);
        LRP(0x2F);
        LR(0x1A);
        LR(0x1B);
        LR(0x1C);
        LR(0x23);
        LR(0x26);
        LR(0x28);
        LR(0x27);
        LR(0x21);
        LRP(0x2A);
        if (m->mode == MATROXFB_OUTPUT_MODE_PAL)
                maven_set_reg(c, 0x35, 0x1D);
        else
                maven_set_reg(c, 0x35, 0x1C);
        LRP(0x3C);
        LR(0x37);
        LR(0x38);

        maven_get_reg(c, 0xB0);
        LR(0xB0);       /* output mode */
        LR(0x90);
        LR(0xBE);
        LR(0xC2);

        LRP(0x9A);
        LRP(0xA2);
        LRP(0x9E);
        LRP(0xA6);
        LRP(0xAA);
        LRP(0xAC);
        maven_set_reg(c, 0x3E, 0x00);
        maven_set_reg(c, 0x95, 0x20);
}

static int maven_find_exact_clocks(unsigned int ht, unsigned int vt,
                struct mavenregs* m) {
        unsigned int x;
        unsigned int err = ~0;

        /* 1:1 */
        m->regs[0x80] = 0x0F;
        m->regs[0x81] = 0x07;
        m->regs[0x82] = 0x81;

        for (x = 0; x < 8; x++) {
                unsigned int c;
                unsigned int uninitialized_var(a), uninitialized_var(b),
                             uninitialized_var(h2);
                unsigned int h = ht + 2 + x;

                if (!matroxfb_mavenclock((m->mode == MATROXFB_OUTPUT_MODE_PAL) ? &maven_PAL : &maven_NTSC, h, vt, &a, &b, &c, &h2)) {
                        unsigned int diff = h - h2;

                        if (diff < err) {
                                err = diff;
                                m->regs[0x80] = a - 1;
                                m->regs[0x81] = b - 1;
                                m->regs[0x82] = c | 0x80;
                                m->hcorr = h2 - 2;
                                m->htotal = h - 2;
                        }
                }
        }
        return err != ~0U;
}

static inline int maven_compute_timming(struct maven_data* md,
                struct my_timming* mt,
                struct mavenregs* m) {
        unsigned int tmpi;
        unsigned int a, bv, c;
        struct matrox_fb_info *minfo = md->primary_head;

        m->mode = minfo->outputs[1].mode;
        if (m->mode != MATROXFB_OUTPUT_MODE_MONITOR) {
                unsigned int lmargin;
                unsigned int umargin;
                unsigned int vslen;
                unsigned int hcrt;
                unsigned int slen;

                maven_init_TVdata(md, m);

                if (maven_find_exact_clocks(mt->HTotal, mt->VTotal, m) == 0)
                        return -EINVAL;

                lmargin = mt->HTotal - mt->HSyncEnd;
                slen = mt->HSyncEnd - mt->HSyncStart;
                hcrt = mt->HTotal - slen - mt->delay;
                umargin = mt->VTotal - mt->VSyncEnd;
                vslen = mt->VSyncEnd - mt->VSyncStart;

                if (m->hcorr < mt->HTotal)
                        hcrt += m->hcorr;
                if (hcrt > mt->HTotal)
                        hcrt -= mt->HTotal;
                if (hcrt + 2 > mt->HTotal)
                        hcrt = 0;       /* or issue warning? */

                /* last (first? middle?) line in picture can have different length */
                /* hlen - 2 */
                m->regs[0x96] = m->hcorr;
                m->regs[0x97] = m->hcorr >> 8;
                /* ... */
                m->regs[0x98] = 0x00; m->regs[0x99] = 0x00;
                /* hblanking end */
                m->regs[0x9A] = lmargin;        /* 100% */
                m->regs[0x9B] = lmargin >> 8;   /* 100% */
                /* who knows */
                m->regs[0x9C] = 0x04;
                m->regs[0x9D] = 0x00;
                /* htotal - 2 */
                m->regs[0xA0] = m->htotal;
                m->regs[0xA1] = m->htotal >> 8;
                /* vblanking end */
                m->regs[0xA2] = mt->VTotal - mt->VSyncStart - 1;        /* stop vblanking */
                m->regs[0xA3] = (mt->VTotal - mt->VSyncStart - 1) >> 8;
                /* something end... [A6]+1..[A8] */
                if (md->version == MGATVO_B) {
                        m->regs[0xA4] = 0x04;
                        m->regs[0xA5] = 0x00;
                } else {
                        m->regs[0xA4] = 0x01;
                        m->regs[0xA5] = 0x00;
                }
                /* something start... 0..[A4]-1 */
                m->regs[0xA6] = 0x00;
                m->regs[0xA7] = 0x00;
                /* vertical line count - 1 */
                m->regs[0xA8] = mt->VTotal - 1;
                m->regs[0xA9] = (mt->VTotal - 1) >> 8;
                /* horizontal vidrst pos */
                m->regs[0xAA] = hcrt;           /* 0 <= hcrt <= htotal - 2 */
                m->regs[0xAB] = hcrt >> 8;
                /* vertical vidrst pos */
                m->regs[0xAC] = mt->VTotal - 2;
                m->regs[0xAD] = (mt->VTotal - 2) >> 8;
                /* moves picture up/down and so on... */
                m->regs[0xAE] = 0x01; /* Fix this... 0..VTotal */
                m->regs[0xAF] = 0x00;
                {
                        int hdec;
                        int hlen;
                        unsigned int ibmin = 4 + lmargin + mt->HDisplay;
                        unsigned int ib;
                        int i;

                        /* Verify! */
                        /* Where 94208 came from? */
                        if (mt->HTotal)
                                hdec = 94208 / (mt->HTotal);
                        else
                                hdec = 0x81;
                        if (hdec > 0x81)
                                hdec = 0x81;
                        if (hdec < 0x41)
                                hdec = 0x41;
                        hdec--;
                        hlen = 98304 - 128 - ((lmargin + mt->HDisplay - 8) * hdec);
                        if (hlen < 0)
                                hlen = 0;
                        hlen = hlen >> 8;
                        if (hlen > 0xFF)
                                hlen = 0xFF;
                        /* Now we have to compute input buffer length.
                           If you want any picture, it must be between
                             4 + lmargin + xres
                           and
                             94208 / hdec
                           If you want perfect picture even on the top
                           of screen, it must be also
                             0x3C0000 * i / hdec + Q - R / hdec
                           where
                                R      Qmin   Qmax
                             0x07000   0x5AE  0x5BF
                             0x08000   0x5CF  0x5FF
                             0x0C000   0x653  0x67F
                             0x10000   0x6F8  0x6FF
                         */
                        i = 1;
                        do {
                                ib = ((0x3C0000 * i - 0x8000)/ hdec + 0x05E7) >> 8;
                                i++;
                        } while (ib < ibmin);
                        if (ib >= m->htotal + 2) {
                                ib = ibmin;
                        }

                        m->regs[0x90] = hdec;   /* < 0x40 || > 0x80 is bad... 0x80 is questionable */
                        m->regs[0xC2] = hlen;
                        /* 'valid' input line length */
                        m->regs[0x9E] = ib;
                        m->regs[0x9F] = ib >> 8;
                }
                {
                        int vdec;
                        int vlen;

#define MATROX_USE64BIT_DIVIDE
                        if (mt->VTotal) {
#ifdef MATROX_USE64BIT_DIVIDE
                                u64 f1;
                                u32 a;
                                u32 b;

                                a = m->vlines * (m->htotal + 2);
                                b = (mt->VTotal - 1) * (m->htotal + 2) + m->hcorr + 2;

                                f1 = ((u64)a) << 15;    /* *32768 */
                                do_div(f1, b);
                                vdec = f1;
#else
                                vdec = m->vlines * 32768 / mt->VTotal;
#endif
                        } else
                                vdec = 0x8000;
                        if (vdec > 0x8000)
                                vdec = 0x8000;
                        vlen = (vslen + umargin + mt->VDisplay) * vdec;
                        vlen = (vlen >> 16) - 146; /* FIXME: 146?! */
                        if (vlen < 0)
                                vlen = 0;
                        if (vlen > 0xFF)
                                vlen = 0xFF;
                        vdec--;
                        m->regs[0x91] = vdec;
                        m->regs[0x92] = vdec >> 8;
                        m->regs[0xBE] = vlen;
                }
                m->regs[0xB0] = 0x08;   /* output: SVideo/Composite */
                return 0;
        }

        DAC1064_calcclock(mt->pixclock, 450000, &a, &bv, &c);
        m->regs[0x80] = a;
        m->regs[0x81] = bv;
        m->regs[0x82] = c | 0x80;

        m->regs[0xB3] = 0x01;
        m->regs[0x94] = 0xB2;

        /* htotal... */
        m->regs[0x96] = mt->HTotal;
        m->regs[0x97] = mt->HTotal >> 8;
        /* ?? */
        m->regs[0x98] = 0x00;
        m->regs[0x99] = 0x00;
        /* hsync len */
        tmpi = mt->HSyncEnd - mt->HSyncStart;
        m->regs[0x9A] = tmpi;
        m->regs[0x9B] = tmpi >> 8;
        /* hblank end */
        tmpi = mt->HTotal - mt->HSyncStart;
        m->regs[0x9C] = tmpi;
        m->regs[0x9D] = tmpi >> 8;
        /* hblank start */
        tmpi += mt->HDisplay;
        m->regs[0x9E] = tmpi;
        m->regs[0x9F] = tmpi >> 8;
        /* htotal + 1 */
        tmpi = mt->HTotal + 1;
        m->regs[0xA0] = tmpi;
        m->regs[0xA1] = tmpi >> 8;
        /* vsync?! */
        tmpi = mt->VSyncEnd - mt->VSyncStart - 1;
        m->regs[0xA2] = tmpi;
        m->regs[0xA3] = tmpi >> 8;
        /* ignored? */
        tmpi = mt->VTotal - mt->VSyncStart;
        m->regs[0xA4] = tmpi;
        m->regs[0xA5] = tmpi >> 8;
        /* ignored? */
        tmpi = mt->VTotal - 1;
        m->regs[0xA6] = tmpi;
        m->regs[0xA7] = tmpi >> 8;
        /* vtotal - 1 */
        m->regs[0xA8] = tmpi;
        m->regs[0xA9] = tmpi >> 8;
        /* hor vidrst */
        tmpi = mt->HTotal - mt->delay;
        m->regs[0xAA] = tmpi;
        m->regs[0xAB] = tmpi >> 8;
        /* vert vidrst */
        tmpi = mt->VTotal - 2;
        m->regs[0xAC] = tmpi;
        m->regs[0xAD] = tmpi >> 8;
        /* ignored? */
        m->regs[0xAE] = 0x00;
        m->regs[0xAF] = 0x00;

        m->regs[0xB0] = 0x03;   /* output: monitor */
        m->regs[0xB1] = 0xA0;   /* ??? */
        m->regs[0x8C] = 0x20;   /* must be set... */
        m->regs[0x8D] = 0x04;   /* defaults to 0x10: test signal */
        m->regs[0xB9] = 0x1A;   /* defaults to 0x2C: too bright */
        m->regs[0xBF] = 0x22;   /* makes picture stable */

        return 0;
}

static int maven_program_timming(struct maven_data* md,
                const struct mavenregs* m) {
        struct i2c_client *c = md->client;

        if (m->mode == MATROXFB_OUTPUT_MODE_MONITOR) {
                LR(0x80);
                LR(0x81);
                LR(0x82);

                LR(0xB3);
                LR(0x94);

                LRP(0x96);
                LRP(0x98);
                LRP(0x9A);
                LRP(0x9C);
                LRP(0x9E);
                LRP(0xA0);
                LRP(0xA2);
                LRP(0xA4);
                LRP(0xA6);
                LRP(0xA8);
                LRP(0xAA);
                LRP(0xAC);
                LRP(0xAE);

                LR(0xB0);       /* output: monitor */
                LR(0xB1);       /* ??? */
                LR(0x8C);       /* must be set... */
                LR(0x8D);       /* defaults to 0x10: test signal */
                LR(0xB9);       /* defaults to 0x2C: too bright */
                LR(0xBF);       /* makes picture stable */
        } else {
                maven_init_TV(c, m);
        }
        return 0;
}

static inline int maven_resync(struct maven_data* md) {
        struct i2c_client *c = md->client;
        maven_set_reg(c, 0x95, 0x20);   /* start whole thing */
        return 0;
}

static int maven_get_queryctrl (struct maven_data* md, 
                                struct v4l2_queryctrl *p) {
        int i;
        
        i = get_ctrl_id(p->id);
        if (i >= 0) {
                *p = maven_controls[i].desc;
                return 0;
        }
        if (i == -ENOENT) {
                static const struct v4l2_queryctrl disctrl = 
                        { .flags = V4L2_CTRL_FLAG_DISABLED };
                        
                i = p->id;
                *p = disctrl;
                p->id = i;
                sprintf(p->name, "Ctrl #%08X", i);
                return 0;
        }
        return -EINVAL;
}

static int maven_set_control (struct maven_data* md, 
                              struct v4l2_control *p) {
        int i;
        
        i = get_ctrl_id(p->id);
        if (i < 0) return -EINVAL;

        /*
         * Check if changed.
         */
        if (p->value == *get_ctrl_ptr(md, i)) return 0;

        /*
         * Check limits.
         */
        if (p->value > maven_controls[i].desc.maximum) return -EINVAL;
        if (p->value < maven_controls[i].desc.minimum) return -EINVAL;

        /*
         * Store new value.
         */
        *get_ctrl_ptr(md, i) = p->value;

        switch (p->id) {
                case V4L2_CID_BRIGHTNESS:
                case V4L2_CID_CONTRAST:
                {
                  int blacklevel, whitelevel;
                  maven_compute_bwlevel(md, &blacklevel, &whitelevel);
                  blacklevel = (blacklevel >> 2) | ((blacklevel & 3) << 8);
                  whitelevel = (whitelevel >> 2) | ((whitelevel & 3) << 8);
                  maven_set_reg_pair(md->client, 0x0e, blacklevel);
                  maven_set_reg_pair(md->client, 0x1e, whitelevel);
                }
                break;
                case V4L2_CID_SATURATION:
                {
                  maven_set_reg(md->client, 0x20, p->value);
                  maven_set_reg(md->client, 0x22, p->value);
                }
                break;
                case V4L2_CID_HUE:
                {
                  maven_set_reg(md->client, 0x25, p->value);
                }
                break;
                case V4L2_CID_GAMMA:
                {
                  const struct maven_gamma* g;
                  g = maven_compute_gamma(md);
                  maven_set_reg(md->client, 0x83, g->reg83);
                  maven_set_reg(md->client, 0x84, g->reg84);
                  maven_set_reg(md->client, 0x85, g->reg85);
                  maven_set_reg(md->client, 0x86, g->reg86);
                  maven_set_reg(md->client, 0x87, g->reg87);
                  maven_set_reg(md->client, 0x88, g->reg88);
                  maven_set_reg(md->client, 0x89, g->reg89);
                  maven_set_reg(md->client, 0x8a, g->reg8a);
                  maven_set_reg(md->client, 0x8b, g->reg8b);
                }
                break;
                case MATROXFB_CID_TESTOUT:
                {
                        unsigned char val 
                          = maven_get_reg(md->client, 0x8d);
                        if (p->value) val |= 0x10;
                        else          val &= ~0x10;
                        maven_set_reg(md->client, 0x8d, val);
                }
                break;
                case MATROXFB_CID_DEFLICKER:
                {
                  maven_set_reg(md->client, 0x93, maven_compute_deflicker(md));
                }
                break;
        }
        

        return 0;
}

static int maven_get_control (struct maven_data* md, 
                              struct v4l2_control *p) {
        int i;
        
        i = get_ctrl_id(p->id);
        if (i < 0) return -EINVAL;
        p->value = *get_ctrl_ptr(md, i);
        return 0;
}

/******************************************************/

static int maven_out_compute(void* md, struct my_timming* mt) {
#define mdinfo ((struct maven_data*)md)
#define minfo (mdinfo->primary_head)
        return maven_compute_timming(md, mt, &minfo->hw.maven);
#undef minfo
#undef mdinfo
}

static int maven_out_program(void* md) {
#define mdinfo ((struct maven_data*)md)
#define minfo (mdinfo->primary_head)
        return maven_program_timming(md, &minfo->hw.maven);
#undef minfo
#undef mdinfo
}

static int maven_out_start(void* md) {
        return maven_resync(md);
}

static int maven_out_verify_mode(void* md, u_int32_t arg) {
        switch (arg) {
                case MATROXFB_OUTPUT_MODE_PAL:
                case MATROXFB_OUTPUT_MODE_NTSC:
                case MATROXFB_OUTPUT_MODE_MONITOR:
                        return 0;
        }
        return -EINVAL;
}

static int maven_out_get_queryctrl(void* md, struct v4l2_queryctrl* p) {
        return maven_get_queryctrl(md, p);
}

static int maven_out_get_ctrl(void* md, struct v4l2_control* p) {
        return maven_get_control(md, p);
}

static int maven_out_set_ctrl(void* md, struct v4l2_control* p) {
        return maven_set_control(md, p);
}

static struct matrox_altout maven_altout = {
        .name           = "Secondary output",
        .compute        = maven_out_compute,
        .program        = maven_out_program,
        .start          = maven_out_start,
        .verifymode     = maven_out_verify_mode,
        .getqueryctrl   = maven_out_get_queryctrl,
        .getctrl        = maven_out_get_ctrl,
        .setctrl        = maven_out_set_ctrl,
};

static int maven_init_client(struct i2c_client* clnt) {
        struct maven_data* md = i2c_get_clientdata(clnt);
        struct matrox_fb_info *minfo = container_of(clnt->adapter,
                                                    struct i2c_bit_adapter,
                                                    adapter)->minfo;

        md->primary_head = minfo;
        md->client = clnt;
        down_write(&minfo->altout.lock);
        minfo->outputs[1].output = &maven_altout;
        minfo->outputs[1].src = minfo->outputs[1].default_src;
        minfo->outputs[1].data = md;
        minfo->outputs[1].mode = MATROXFB_OUTPUT_MODE_MONITOR;
        up_write(&minfo->altout.lock);
        if (maven_get_reg(clnt, 0xB2) < 0x14) {
                md->version = MGATVO_B;
                /* Tweak some things for this old chip */
        } else {
                md->version = MGATVO_C;
        }
        /*
         * Set all parameters to its initial values.
         */
        {
                unsigned int i;

                for (i = 0; i < MAVCTRLS; ++i) {
                        *get_ctrl_ptr(md, i) = maven_controls[i].desc.default_value;
                }
        }

        return 0;
}

static int maven_shutdown_client(struct i2c_client* clnt) {
        struct maven_data* md = i2c_get_clientdata(clnt);

        if (md->primary_head) {
                struct matrox_fb_info *minfo = md->primary_head;

                down_write(&minfo->altout.lock);
                minfo->outputs[1].src = MATROXFB_SRC_NONE;
                minfo->outputs[1].output = NULL;
                minfo->outputs[1].data = NULL;
                minfo->outputs[1].mode = MATROXFB_OUTPUT_MODE_MONITOR;
                up_write(&minfo->altout.lock);
                md->primary_head = NULL;
        }
        return 0;
}

static int maven_probe(struct i2c_client *client,
                       const struct i2c_device_id *id)
{
        struct i2c_adapter *adapter = client->adapter;
        int err = -ENODEV;
        struct maven_data* data;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_WORD_DATA |
                                              I2C_FUNC_SMBUS_BYTE_DATA |
                                              I2C_FUNC_NOSTART |
                                              I2C_FUNC_PROTOCOL_MANGLING))
                goto ERROR0;
        if (!(data = kzalloc(sizeof(*data), GFP_KERNEL))) {
                err = -ENOMEM;
                goto ERROR0;
        }
        i2c_set_clientdata(client, data);
        err = maven_init_client(client);
        if (err)
                goto ERROR4;
        return 0;
ERROR4:;
        kfree(data);
ERROR0:;
        return err;
}

static int maven_remove(struct i2c_client *client)
{
        maven_shutdown_client(client);
        kfree(i2c_get_clientdata(client));
        return 0;
}

static const struct i2c_device_id maven_id[] = {
        { "maven", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, maven_id);

static struct i2c_driver maven_driver={
        .driver = {
                .name   = "maven",
        },
        .probe          = maven_probe,
        .remove         = maven_remove,
        .id_table       = maven_id,
};

module_i2c_driver(maven_driver);
MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
MODULE_DESCRIPTION("Matrox G200/G400 Matrox MGA-TVO driver");
MODULE_LICENSE("GPL");