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mt20xx.c

/*
 * i2c tv tuner chip device driver
 * controls microtune tuners, mt2032 + mt2050 at the moment.
 *
 * This "mt20xx" module was split apart from the original "tuner" module.
 */
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/videodev.h>
#include "tuner-i2c.h"
#include "mt20xx.h"

static int debug = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable verbose debug messages");

#define PREFIX "mt20xx "

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

static unsigned int optimize_vco  = 1;
module_param(optimize_vco,      int, 0644);

static unsigned int tv_antenna    = 1;
module_param(tv_antenna,        int, 0644);

static unsigned int radio_antenna = 0;
module_param(radio_antenna,     int, 0644);

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

#define MT2032 0x04
#define MT2030 0x06
#define MT2040 0x07
#define MT2050 0x42

static char *microtune_part[] = {
      [ MT2030 ] = "MT2030",
      [ MT2032 ] = "MT2032",
      [ MT2040 ] = "MT2040",
      [ MT2050 ] = "MT2050",
};

struct microtune_priv {
      struct tuner_i2c_props i2c_props;

      unsigned int xogc;
      //unsigned int radio_if2;

      u32 frequency;
};

static int microtune_release(struct dvb_frontend *fe)
{
      kfree(fe->tuner_priv);
      fe->tuner_priv = NULL;

      return 0;
}

static int microtune_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
      struct microtune_priv *priv = fe->tuner_priv;
      *frequency = priv->frequency;
      return 0;
}

// IsSpurInBand()?
static int mt2032_spurcheck(struct dvb_frontend *fe,
                      int f1, int f2, int spectrum_from,int spectrum_to)
{
      struct microtune_priv *priv = fe->tuner_priv;
      int n1=1,n2,f;

      f1=f1/1000; //scale to kHz to avoid 32bit overflows
      f2=f2/1000;
      spectrum_from/=1000;
      spectrum_to/=1000;

      tuner_dbg("spurcheck f1=%d f2=%d  from=%d to=%d\n",
              f1,f2,spectrum_from,spectrum_to);

      do {
          n2=-n1;
          f=n1*(f1-f2);
          do {
            n2--;
            f=f-f2;
            tuner_dbg("spurtest n1=%d n2=%d ftest=%d\n",n1,n2,f);

            if( (f>spectrum_from) && (f<spectrum_to))
                  tuner_dbg("mt2032 spurcheck triggered: %d\n",n1);
          } while ( (f>(f2-spectrum_to)) || (n2>-5));
          n1++;
      } while (n1<5);

      return 1;
}

static int mt2032_compute_freq(struct dvb_frontend *fe,
                         unsigned int rfin,
                         unsigned int if1, unsigned int if2,
                         unsigned int spectrum_from,
                         unsigned int spectrum_to,
                         unsigned char *buf,
                         int *ret_sel,
                         unsigned int xogc) //all in Hz
{
      struct microtune_priv *priv = fe->tuner_priv;
      unsigned int fref,lo1,lo1n,lo1a,s,sel,lo1freq, desired_lo1,
            desired_lo2,lo2,lo2n,lo2a,lo2num,lo2freq;

      fref= 5250 *1000; //5.25MHz
      desired_lo1=rfin+if1;

      lo1=(2*(desired_lo1/1000)+(fref/1000)) / (2*fref/1000);
      lo1n=lo1/8;
      lo1a=lo1-(lo1n*8);

      s=rfin/1000/1000+1090;

      if(optimize_vco) {
            if(s>1890) sel=0;
            else if(s>1720) sel=1;
            else if(s>1530) sel=2;
            else if(s>1370) sel=3;
            else sel=4; // >1090
      }
      else {
            if(s>1790) sel=0; // <1958
            else if(s>1617) sel=1;
            else if(s>1449) sel=2;
            else if(s>1291) sel=3;
            else sel=4; // >1090
      }
      *ret_sel=sel;

      lo1freq=(lo1a+8*lo1n)*fref;

      tuner_dbg("mt2032: rfin=%d lo1=%d lo1n=%d lo1a=%d sel=%d, lo1freq=%d\n",
              rfin,lo1,lo1n,lo1a,sel,lo1freq);

      desired_lo2=lo1freq-rfin-if2;
      lo2=(desired_lo2)/fref;
      lo2n=lo2/8;
      lo2a=lo2-(lo2n*8);
      lo2num=((desired_lo2/1000)%(fref/1000))* 3780/(fref/1000); //scale to fit in 32bit arith
      lo2freq=(lo2a+8*lo2n)*fref + lo2num*(fref/1000)/3780*1000;

      tuner_dbg("mt2032: rfin=%d lo2=%d lo2n=%d lo2a=%d num=%d lo2freq=%d\n",
              rfin,lo2,lo2n,lo2a,lo2num,lo2freq);

      if(lo1a<0 || lo1a>7 || lo1n<17 ||lo1n>48 || lo2a<0 ||lo2a >7 ||lo2n<17 || lo2n>30) {
            tuner_info("mt2032: frequency parameters out of range: %d %d %d %d\n",
                     lo1a, lo1n, lo2a,lo2n);
            return(-1);
      }

      mt2032_spurcheck(fe, lo1freq, desired_lo2,  spectrum_from, spectrum_to);
      // should recalculate lo1 (one step up/down)

      // set up MT2032 register map for transfer over i2c
      buf[0]=lo1n-1;
      buf[1]=lo1a | (sel<<4);
      buf[2]=0x86; // LOGC
      buf[3]=0x0f; //reserved
      buf[4]=0x1f;
      buf[5]=(lo2n-1) | (lo2a<<5);
      if(rfin >400*1000*1000)
            buf[6]=0xe4;
      else
            buf[6]=0xf4; // set PKEN per rev 1.2
      buf[7]=8+xogc;
      buf[8]=0xc3; //reserved
      buf[9]=0x4e; //reserved
      buf[10]=0xec; //reserved
      buf[11]=(lo2num&0xff);
      buf[12]=(lo2num>>8) |0x80; // Lo2RST

      return 0;
}

static int mt2032_check_lo_lock(struct dvb_frontend *fe)
{
      struct microtune_priv *priv = fe->tuner_priv;
      int try,lock=0;
      unsigned char buf[2];

      for(try=0;try<10;try++) {
            buf[0]=0x0e;
            tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
            tuner_i2c_xfer_recv(&priv->i2c_props,buf,1);
            tuner_dbg("mt2032 Reg.E=0x%02x\n",buf[0]);
            lock=buf[0] &0x06;

            if (lock==6)
                  break;

            tuner_dbg("mt2032: pll wait 1ms for lock (0x%2x)\n",buf[0]);
            udelay(1000);
      }
      return lock;
}

static int mt2032_optimize_vco(struct dvb_frontend *fe,int sel,int lock)
{
      struct microtune_priv *priv = fe->tuner_priv;
      unsigned char buf[2];
      int tad1;

      buf[0]=0x0f;
      tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
      tuner_i2c_xfer_recv(&priv->i2c_props,buf,1);
      tuner_dbg("mt2032 Reg.F=0x%02x\n",buf[0]);
      tad1=buf[0]&0x07;

      if(tad1 ==0) return lock;
      if(tad1 ==1) return lock;

      if(tad1==2) {
            if(sel==0)
                  return lock;
            else sel--;
      }
      else {
            if(sel<4)
                  sel++;
            else
                  return lock;
      }

      tuner_dbg("mt2032 optimize_vco: sel=%d\n",sel);

      buf[0]=0x0f;
      buf[1]=sel;
      tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
      lock=mt2032_check_lo_lock(fe);
      return lock;
}


static void mt2032_set_if_freq(struct dvb_frontend *fe, unsigned int rfin,
                         unsigned int if1, unsigned int if2,
                         unsigned int from, unsigned int to)
{
      unsigned char buf[21];
      int lint_try,ret,sel,lock=0;
      struct microtune_priv *priv = fe->tuner_priv;

      tuner_dbg("mt2032_set_if_freq rfin=%d if1=%d if2=%d from=%d to=%d\n",
              rfin,if1,if2,from,to);

      buf[0]=0;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
      tuner_i2c_xfer_recv(&priv->i2c_props,buf,21);

      buf[0]=0;
      ret=mt2032_compute_freq(fe,rfin,if1,if2,from,to,&buf[1],&sel,priv->xogc);
      if (ret<0)
            return;

      // send only the relevant registers per Rev. 1.2
      buf[0]=0;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,4);
      buf[5]=5;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+5,4);
      buf[11]=11;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+11,3);
      if(ret!=3)
            tuner_warn("i2c i/o error: rc == %d (should be 3)\n",ret);

      // wait for PLLs to lock (per manual), retry LINT if not.
      for(lint_try=0; lint_try<2; lint_try++) {
            lock=mt2032_check_lo_lock(fe);

            if(optimize_vco)
                  lock=mt2032_optimize_vco(fe,sel,lock);
            if(lock==6) break;

            tuner_dbg("mt2032: re-init PLLs by LINT\n");
            buf[0]=7;
            buf[1]=0x80 +8+priv->xogc; // set LINT to re-init PLLs
            tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
            mdelay(10);
            buf[1]=8+priv->xogc;
            tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
      }

      if (lock!=6)
            tuner_warn("MT2032 Fatal Error: PLLs didn't lock.\n");

      buf[0]=2;
      buf[1]=0x20; // LOGC for optimal phase noise
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
      if (ret!=2)
            tuner_warn("i2c i/o error: rc == %d (should be 2)\n",ret);
}


static int mt2032_set_tv_freq(struct dvb_frontend *fe,
                        struct analog_parameters *params)
{
      int if2,from,to;

      // signal bandwidth and picture carrier
      if (params->std & V4L2_STD_525_60) {
            // NTSC
            from = 40750*1000;
            to   = 46750*1000;
            if2  = 45750*1000;
      } else {
            // PAL
            from = 32900*1000;
            to   = 39900*1000;
            if2  = 38900*1000;
      }

      mt2032_set_if_freq(fe, params->frequency*62500,
                     1090*1000*1000, if2, from, to);

      return 0;
}

static int mt2032_set_radio_freq(struct dvb_frontend *fe,
                         struct analog_parameters *params)
{
      struct microtune_priv *priv = fe->tuner_priv;
      int if2;

      if (params->std & V4L2_STD_525_60) {
            tuner_dbg("pinnacle ntsc\n");
            if2 = 41300 * 1000;
      } else {
            tuner_dbg("pinnacle pal\n");
            if2 = 33300 * 1000;
      }

      // per Manual for FM tuning: first if center freq. 1085 MHz
      mt2032_set_if_freq(fe, params->frequency * 125 / 2,
                     1085*1000*1000,if2,if2,if2);

      return 0;
}

static int mt2032_set_params(struct dvb_frontend *fe,
                       struct analog_parameters *params)
{
      struct microtune_priv *priv = fe->tuner_priv;
      int ret = -EINVAL;

      switch (params->mode) {
      case V4L2_TUNER_RADIO:
            ret = mt2032_set_radio_freq(fe, params);
            priv->frequency = params->frequency * 125 / 2;
            break;
      case V4L2_TUNER_ANALOG_TV:
      case V4L2_TUNER_DIGITAL_TV:
            ret = mt2032_set_tv_freq(fe, params);
            priv->frequency = params->frequency * 62500;
            break;
      }

      return ret;
}

static struct dvb_tuner_ops mt2032_tuner_ops = {
      .set_analog_params = mt2032_set_params,
      .release           = microtune_release,
      .get_frequency     = microtune_get_frequency,
};

// Initalization as described in "MT203x Programming Procedures", Rev 1.2, Feb.2001
static int mt2032_init(struct dvb_frontend *fe)
{
      struct microtune_priv *priv = fe->tuner_priv;
      unsigned char buf[21];
      int ret,xogc,xok=0;

      // Initialize Registers per spec.
      buf[1]=2; // Index to register 2
      buf[2]=0xff;
      buf[3]=0x0f;
      buf[4]=0x1f;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+1,4);

      buf[5]=6; // Index register 6
      buf[6]=0xe4;
      buf[7]=0x8f;
      buf[8]=0xc3;
      buf[9]=0x4e;
      buf[10]=0xec;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+5,6);

      buf[12]=13;  // Index register 13
      buf[13]=0x32;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+12,2);

      // Adjust XOGC (register 7), wait for XOK
      xogc=7;
      do {
            tuner_dbg("mt2032: xogc = 0x%02x\n",xogc&0x07);
            mdelay(10);
            buf[0]=0x0e;
            tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
            tuner_i2c_xfer_recv(&priv->i2c_props,buf,1);
            xok=buf[0]&0x01;
            tuner_dbg("mt2032: xok = 0x%02x\n",xok);
            if (xok == 1) break;

            xogc--;
            tuner_dbg("mt2032: xogc = 0x%02x\n",xogc&0x07);
            if (xogc == 3) {
                  xogc=4; // min. 4 per spec
                  break;
            }
            buf[0]=0x07;
            buf[1]=0x88 + xogc;
            ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
            if (ret!=2)
                  tuner_warn("i2c i/o error: rc == %d (should be 2)\n",ret);
      } while (xok != 1 );
      priv->xogc=xogc;

      memcpy(&fe->ops.tuner_ops, &mt2032_tuner_ops, sizeof(struct dvb_tuner_ops));

      return(1);
}

static void mt2050_set_antenna(struct dvb_frontend *fe, unsigned char antenna)
{
      struct microtune_priv *priv = fe->tuner_priv;
      unsigned char buf[2];
      int ret;

      buf[0] = 6;
      buf[1] = antenna ? 0x11 : 0x10;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
      tuner_dbg("mt2050: enabled antenna connector %d\n", antenna);
}

static void mt2050_set_if_freq(struct dvb_frontend *fe,unsigned int freq, unsigned int if2)
{
      struct microtune_priv *priv = fe->tuner_priv;
      unsigned int if1=1218*1000*1000;
      unsigned int f_lo1,f_lo2,lo1,lo2,f_lo1_modulo,f_lo2_modulo,num1,num2,div1a,div1b,div2a,div2b;
      int ret;
      unsigned char buf[6];

      tuner_dbg("mt2050_set_if_freq freq=%d if1=%d if2=%d\n",
              freq,if1,if2);

      f_lo1=freq+if1;
      f_lo1=(f_lo1/1000000)*1000000;

      f_lo2=f_lo1-freq-if2;
      f_lo2=(f_lo2/50000)*50000;

      lo1=f_lo1/4000000;
      lo2=f_lo2/4000000;

      f_lo1_modulo= f_lo1-(lo1*4000000);
      f_lo2_modulo= f_lo2-(lo2*4000000);

      num1=4*f_lo1_modulo/4000000;
      num2=4096*(f_lo2_modulo/1000)/4000;

      // todo spurchecks

      div1a=(lo1/12)-1;
      div1b=lo1-(div1a+1)*12;

      div2a=(lo2/8)-1;
      div2b=lo2-(div2a+1)*8;

      if (debug > 1) {
            tuner_dbg("lo1 lo2 = %d %d\n", lo1, lo2);
            tuner_dbg("num1 num2 div1a div1b div2a div2b= %x %x %x %x %x %x\n",
                    num1,num2,div1a,div1b,div2a,div2b);
      }

      buf[0]=1;
      buf[1]= 4*div1b + num1;
      if(freq<275*1000*1000) buf[1] = buf[1]|0x80;

      buf[2]=div1a;
      buf[3]=32*div2b + num2/256;
      buf[4]=num2-(num2/256)*256;
      buf[5]=div2a;
      if(num2!=0) buf[5]=buf[5]|0x40;

      if (debug > 1) {
            int i;
            tuner_dbg("bufs is: ");
            for(i=0;i<6;i++)
                  printk("%x ",buf[i]);
            printk("\n");
      }

      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,6);
      if (ret!=6)
            tuner_warn("i2c i/o error: rc == %d (should be 6)\n",ret);
}

static int mt2050_set_tv_freq(struct dvb_frontend *fe,
                        struct analog_parameters *params)
{
      unsigned int if2;

      if (params->std & V4L2_STD_525_60) {
            // NTSC
            if2 = 45750*1000;
      } else {
            // PAL
            if2 = 38900*1000;
      }
      if (V4L2_TUNER_DIGITAL_TV == params->mode) {
            // DVB (pinnacle 300i)
            if2 = 36150*1000;
      }
      mt2050_set_if_freq(fe, params->frequency*62500, if2);
      mt2050_set_antenna(fe, tv_antenna);

      return 0;
}

static int mt2050_set_radio_freq(struct dvb_frontend *fe,
                         struct analog_parameters *params)
{
      struct microtune_priv *priv = fe->tuner_priv;
      int if2;

      if (params->std & V4L2_STD_525_60) {
            tuner_dbg("pinnacle ntsc\n");
            if2 = 41300 * 1000;
      } else {
            tuner_dbg("pinnacle pal\n");
            if2 = 33300 * 1000;
      }

      mt2050_set_if_freq(fe, params->frequency * 125 / 2, if2);
      mt2050_set_antenna(fe, radio_antenna);

      return 0;
}

static int mt2050_set_params(struct dvb_frontend *fe,
                       struct analog_parameters *params)
{
      struct microtune_priv *priv = fe->tuner_priv;
      int ret = -EINVAL;

      switch (params->mode) {
      case V4L2_TUNER_RADIO:
            ret = mt2050_set_radio_freq(fe, params);
            priv->frequency = params->frequency * 125 / 2;
            break;
      case V4L2_TUNER_ANALOG_TV:
      case V4L2_TUNER_DIGITAL_TV:
            ret = mt2050_set_tv_freq(fe, params);
            priv->frequency = params->frequency * 62500;
            break;
      }

      return ret;
}

static struct dvb_tuner_ops mt2050_tuner_ops = {
      .set_analog_params = mt2050_set_params,
      .release           = microtune_release,
      .get_frequency     = microtune_get_frequency,
};

static int mt2050_init(struct dvb_frontend *fe)
{
      struct microtune_priv *priv = fe->tuner_priv;
      unsigned char buf[2];
      int ret;

      buf[0]=6;
      buf[1]=0x10;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2); //  power

      buf[0]=0x0f;
      buf[1]=0x0f;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2); // m1lo

      buf[0]=0x0d;
      ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
      tuner_i2c_xfer_recv(&priv->i2c_props,buf,1);

      tuner_dbg("mt2050: sro is %x\n",buf[0]);

      memcpy(&fe->ops.tuner_ops, &mt2050_tuner_ops, sizeof(struct dvb_tuner_ops));

      return 0;
}

struct dvb_frontend *microtune_attach(struct dvb_frontend *fe,
                              struct i2c_adapter* i2c_adap,
                              u8 i2c_addr)
{
      struct microtune_priv *priv = NULL;
      char *name;
      unsigned char buf[21];
      int company_code;

      priv = kzalloc(sizeof(struct microtune_priv), GFP_KERNEL);
      if (priv == NULL)
            return NULL;
      fe->tuner_priv = priv;

      priv->i2c_props.addr = i2c_addr;
      priv->i2c_props.adap = i2c_adap;

      //priv->radio_if2 = 10700 * 1000;   /* 10.7MHz - FM radio */

      memset(buf,0,sizeof(buf));

      name = "unknown";

      tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
      tuner_i2c_xfer_recv(&priv->i2c_props,buf,21);
      if (debug) {
            int i;
            tuner_dbg("MT20xx hexdump:");
            for(i=0;i<21;i++) {
                  printk(" %02x",buf[i]);
                  if(((i+1)%8)==0) printk(" ");
            }
            printk("\n");
      }
      company_code = buf[0x11] << 8 | buf[0x12];
      tuner_info("microtune: companycode=%04x part=%02x rev=%02x\n",
               company_code,buf[0x13],buf[0x14]);


      if (buf[0x13] < ARRAY_SIZE(microtune_part) &&
          NULL != microtune_part[buf[0x13]])
            name = microtune_part[buf[0x13]];
      switch (buf[0x13]) {
      case MT2032:
            mt2032_init(fe);
            break;
      case MT2050:
            mt2050_init(fe);
            break;
      default:
            tuner_info("microtune %s found, not (yet?) supported, sorry :-/\n",
                     name);
            return 0;
      }

      strlcpy(fe->ops.tuner_ops.info.name, name,
            sizeof(fe->ops.tuner_ops.info.name));
      tuner_info("microtune %s found, OK\n",name);
      return fe;
}

EXPORT_SYMBOL_GPL(microtune_attach);

MODULE_DESCRIPTION("Microtune tuner driver");
MODULE_AUTHOR("Ralph Metzler, Gerd Knorr, Gunther Mayer");
MODULE_LICENSE("GPL");

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */

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