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matroxfb_maven.c

/*
 *
 * 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 <asm/div64.h>

#define MAVEN_I2CID     (0x1B)

#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[] = {{ c->addr, I2C_M_REV_DIR_ADDR, sizeof(reg), &reg },
                         { c->addr, I2C_M_RD | I2C_M_NOSTART, sizeof(dst), &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 = {
       50000000,
      300000000,
       5, 128,
       3,  32,
       3
};

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

static const struct matrox_pll_ctl maven_NTSC = {
      450450,     /* 27027000/60 == 27000000/59.94005994 */
          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(__FUNCTION__)

      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 unsigned 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 };
      MINFO_FROM(md->primary_head);

      if (ACCESS_FBINFO(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] = ACCESS_FBINFO(altout.tvo_params.saturation);
      }
 
      /* Set HUE */
      data->regs[0x25] = ACCESS_FBINFO(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;
      MINFO_FROM(md->primary_head);

      m->mode = ACCESS_FBINFO(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, &ACCESS_FBINFO(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, &ACCESS_FBINFO(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);
      MINFO_FROM(container_of(clnt->adapter, struct i2c_bit_adapter, adapter)->minfo);

      md->primary_head = MINFO;
      down_write(&ACCESS_FBINFO(altout.lock));
      ACCESS_FBINFO(outputs[1]).output = &maven_altout;
      ACCESS_FBINFO(outputs[1]).src = ACCESS_FBINFO(outputs[1]).default_src;
      ACCESS_FBINFO(outputs[1]).data = md;
      ACCESS_FBINFO(outputs[1]).mode = MATROXFB_OUTPUT_MODE_MONITOR;
      up_write(&ACCESS_FBINFO(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) {
            MINFO_FROM(md->primary_head);

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

static unsigned short normal_i2c[] = { MAVEN_I2CID, I2C_CLIENT_END };
I2C_CLIENT_INSMOD;

static struct i2c_driver maven_driver;

static int maven_detect_client(struct i2c_adapter* adapter, int address, int kind) {
      int err = 0;
      struct i2c_client* new_client;
      struct maven_data* data;

      if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_WORD_DATA |
                                    I2C_FUNC_SMBUS_BYTE_DATA |
                                    I2C_FUNC_PROTOCOL_MANGLING))
            goto ERROR0;
      if (!(data = kzalloc(sizeof(*data), GFP_KERNEL))) {
            err = -ENOMEM;
            goto ERROR0;
      }
      new_client = &data->client;
      i2c_set_clientdata(new_client, data);
      new_client->addr = address;
      new_client->adapter = adapter;
      new_client->driver = &maven_driver;
      new_client->flags = 0;
      strlcpy(new_client->name, "maven", I2C_NAME_SIZE);
      if ((err = i2c_attach_client(new_client)))
            goto ERROR3;
      err = maven_init_client(new_client);
      if (err)
            goto ERROR4;
      return 0;
ERROR4:;
      i2c_detach_client(new_client);
ERROR3:;
      kfree(new_client);
ERROR0:;
      return err;
}

static int maven_attach_adapter(struct i2c_adapter* adapter) {
      if (adapter->id == I2C_HW_B_G400)
            return i2c_probe(adapter, &addr_data, &maven_detect_client);
      return 0;
}

static int maven_detach_client(struct i2c_client* client) {
      int err;

      if ((err = i2c_detach_client(client)))
            return err;
      maven_shutdown_client(client);
      kfree(i2c_get_clientdata(client));
      return 0;
}

static struct i2c_driver maven_driver={
      .driver = {
            .name = "maven",
      },
      .id         = I2C_DRIVERID_MGATVO,
      .attach_adapter   = maven_attach_adapter,
      .detach_client    = maven_detach_client,
};

static int __init matroxfb_maven_init(void)
{
      return i2c_add_driver(&maven_driver);
}

static void __exit matroxfb_maven_exit(void)
{
      i2c_del_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");
module_init(matroxfb_maven_init);
module_exit(matroxfb_maven_exit);
/* we do not have __setup() yet */

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