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tda10021.c

/*
    TDA10021  - Single Chip Cable Channel Receiver driver module
             used on the Siemens DVB-C cards

    Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
    Copyright (C) 2004 Markus Schulz <msc@antzsystem.de>
               Support for TDA10021

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>

#include "dvb_frontend.h"
#include "tda1002x.h"


struct tda10021_state {
      struct i2c_adapter* i2c;
      /* configuration settings */
      const struct tda1002x_config* config;
      struct dvb_frontend frontend;

      u8 pwm;
      u8 reg0;
};


#if 0
#define dprintk(x...) printk(x)
#else
#define dprintk(x...)
#endif

static int verbose;

#define XIN 57840000UL

#define FIN (XIN >> 4)

static int tda10021_inittab_size = 0x40;
static u8 tda10021_inittab[0x40]=
{
      0x73, 0x6a, 0x23, 0x0a, 0x02, 0x37, 0x77, 0x1a,
      0x37, 0x6a, 0x17, 0x8a, 0x1e, 0x86, 0x43, 0x40,
      0xb8, 0x3f, 0xa1, 0x00, 0xcd, 0x01, 0x00, 0xff,
      0x11, 0x00, 0x7c, 0x31, 0x30, 0x20, 0x00, 0x00,
      0x02, 0x00, 0x00, 0x7d, 0x00, 0x00, 0x00, 0x00,
      0x07, 0x00, 0x33, 0x11, 0x0d, 0x95, 0x08, 0x58,
      0x00, 0x00, 0x80, 0x00, 0x80, 0xff, 0x00, 0x00,
      0x04, 0x2d, 0x2f, 0xff, 0x00, 0x00, 0x00, 0x00,
};

static int _tda10021_writereg (struct tda10021_state* state, u8 reg, u8 data)
{
      u8 buf[] = { reg, data };
      struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
      int ret;

      ret = i2c_transfer (state->i2c, &msg, 1);
      if (ret != 1)
            printk("DVB: TDA10021(%d): %s, writereg error "
                  "(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
                  state->frontend.dvb->num, __FUNCTION__, reg, data, ret);

      msleep(10);
      return (ret != 1) ? -EREMOTEIO : 0;
}

static u8 tda10021_readreg (struct tda10021_state* state, u8 reg)
{
      u8 b0 [] = { reg };
      u8 b1 [] = { 0 };
      struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
                          { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
      int ret;

      ret = i2c_transfer (state->i2c, msg, 2);
      // Don't print an error message if the id is read.
      if (ret != 2 && reg != 0x1a)
            printk("DVB: TDA10021: %s: readreg error (ret == %i)\n",
                        __FUNCTION__, ret);
      return b1[0];
}

//get access to tuner
static int lock_tuner(struct tda10021_state* state)
{
      u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] | 0x80 };
      struct i2c_msg msg = {.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};

      if(i2c_transfer(state->i2c, &msg, 1) != 1)
      {
            printk("tda10021: lock tuner fails\n");
            return -EREMOTEIO;
      }
      return 0;
}

//release access from tuner
static int unlock_tuner(struct tda10021_state* state)
{
      u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] & 0x7f };
      struct i2c_msg msg_post={.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};

      if(i2c_transfer(state->i2c, &msg_post, 1) != 1)
      {
            printk("tda10021: unlock tuner fails\n");
            return -EREMOTEIO;
      }
      return 0;
}

static int tda10021_setup_reg0 (struct tda10021_state* state, u8 reg0,
                        fe_spectral_inversion_t inversion)
{
      reg0 |= state->reg0 & 0x63;

      if ((INVERSION_ON == inversion) ^ (state->config->invert == 0))
            reg0 &= ~0x20;
      else
            reg0 |= 0x20;

      _tda10021_writereg (state, 0x00, reg0 & 0xfe);
      _tda10021_writereg (state, 0x00, reg0 | 0x01);

      state->reg0 = reg0;
      return 0;
}

static int tda10021_set_symbolrate (struct tda10021_state* state, u32 symbolrate)
{
      s32 BDR;
      s32 BDRI;
      s16 SFIL=0;
      u16 NDEC = 0;
      u32 tmp, ratio;

      if (symbolrate > XIN/2)
            symbolrate = XIN/2;
      if (symbolrate < 500000)
            symbolrate = 500000;

      if (symbolrate < XIN/16) NDEC = 1;
      if (symbolrate < XIN/32) NDEC = 2;
      if (symbolrate < XIN/64) NDEC = 3;

      if (symbolrate < (u32)(XIN/12.3)) SFIL = 1;
      if (symbolrate < (u32)(XIN/16))      SFIL = 0;
      if (symbolrate < (u32)(XIN/24.6)) SFIL = 1;
      if (symbolrate < (u32)(XIN/32))      SFIL = 0;
      if (symbolrate < (u32)(XIN/49.2)) SFIL = 1;
      if (symbolrate < (u32)(XIN/64))      SFIL = 0;
      if (symbolrate < (u32)(XIN/98.4)) SFIL = 1;

      symbolrate <<= NDEC;
      ratio = (symbolrate << 4) / FIN;
      tmp =  ((symbolrate << 4) % FIN) << 8;
      ratio = (ratio << 8) + tmp / FIN;
      tmp = (tmp % FIN) << 8;
      ratio = (ratio << 8) + (tmp + FIN/2) / FIN;

      BDR = ratio;
      BDRI = (((XIN << 5) / symbolrate) + 1) / 2;

      if (BDRI > 0xFF)
            BDRI = 0xFF;

      SFIL = (SFIL << 4) | tda10021_inittab[0x0E];

      NDEC = (NDEC << 6) | tda10021_inittab[0x03];

      _tda10021_writereg (state, 0x03, NDEC);
      _tda10021_writereg (state, 0x0a, BDR&0xff);
      _tda10021_writereg (state, 0x0b, (BDR>> 8)&0xff);
      _tda10021_writereg (state, 0x0c, (BDR>>16)&0x3f);

      _tda10021_writereg (state, 0x0d, BDRI);
      _tda10021_writereg (state, 0x0e, SFIL);

      return 0;
}

static int tda10021_init (struct dvb_frontend *fe)
{
      struct tda10021_state* state = fe->demodulator_priv;
      int i;

      dprintk("DVB: TDA10021(%d): init chip\n", fe->adapter->num);

      //_tda10021_writereg (fe, 0, 0);

      for (i=0; i<tda10021_inittab_size; i++)
            _tda10021_writereg (state, i, tda10021_inittab[i]);

      _tda10021_writereg (state, 0x34, state->pwm);

      //Comment by markus
      //0x2A[3-0] == PDIV -> P multiplaying factor (P=PDIV+1)(default 0)
      //0x2A[4] == BYPPLL -> Power down mode (default 1)
      //0x2A[5] == LCK -> PLL Lock Flag
      //0x2A[6] == POLAXIN -> Polarity of the input reference clock (default 0)

      //Activate PLL
      _tda10021_writereg(state, 0x2a, tda10021_inittab[0x2a] & 0xef);
      return 0;
}

static int tda10021_set_parameters (struct dvb_frontend *fe,
                      struct dvb_frontend_parameters *p)
{
      struct tda10021_state* state = fe->demodulator_priv;

      //table for QAM4-QAM256 ready  QAM4  QAM16 QAM32 QAM64 QAM128 QAM256
      //CONF
      static const u8 reg0x00 [] = { 0x14, 0x00, 0x04, 0x08, 0x0c,  0x10 };
      //AGCREF value
      static const u8 reg0x01 [] = { 0x78, 0x8c, 0x8c, 0x6a, 0x78,  0x5c };
      //LTHR value
      static const u8 reg0x05 [] = { 0x78, 0x87, 0x64, 0x46, 0x36,  0x26 };
      //MSETH
      static const u8 reg0x08 [] = { 0x8c, 0xa2, 0x74, 0x43, 0x34,  0x23 };
      //AREF
      static const u8 reg0x09 [] = { 0x96, 0x91, 0x96, 0x6a, 0x7e,  0x6b };

      int qam = p->u.qam.modulation;

      if (qam < 0 || qam > 5)
            return -EINVAL;

      if (p->inversion != INVERSION_ON && p->inversion != INVERSION_OFF)
            return -EINVAL;

      //printk("tda10021: set frequency to %d qam=%d symrate=%d\n", p->frequency,qam,p->u.qam.symbol_rate);

      if (fe->ops.tuner_ops.set_params) {
            fe->ops.tuner_ops.set_params(fe, p);
            if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
      }

      tda10021_set_symbolrate (state, p->u.qam.symbol_rate);
      _tda10021_writereg (state, 0x34, state->pwm);

      _tda10021_writereg (state, 0x01, reg0x01[qam]);
      _tda10021_writereg (state, 0x05, reg0x05[qam]);
      _tda10021_writereg (state, 0x08, reg0x08[qam]);
      _tda10021_writereg (state, 0x09, reg0x09[qam]);

      tda10021_setup_reg0 (state, reg0x00[qam], p->inversion);

      return 0;
}

static int tda10021_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
      struct tda10021_state* state = fe->demodulator_priv;
      int sync;

      *status = 0;
      //0x11[0] == EQALGO -> Equalizer algorithms state
      //0x11[1] == CARLOCK -> Carrier locked
      //0x11[2] == FSYNC -> Frame synchronisation
      //0x11[3] == FEL -> Front End locked
      //0x11[6] == NODVB -> DVB Mode Information
      sync = tda10021_readreg (state, 0x11);

      if (sync & 2)
            *status |= FE_HAS_SIGNAL|FE_HAS_CARRIER;

      if (sync & 4)
            *status |= FE_HAS_SYNC|FE_HAS_VITERBI;

      if (sync & 8)
            *status |= FE_HAS_LOCK;

      return 0;
}

static int tda10021_read_ber(struct dvb_frontend* fe, u32* ber)
{
      struct tda10021_state* state = fe->demodulator_priv;

      u32 _ber = tda10021_readreg(state, 0x14) |
            (tda10021_readreg(state, 0x15) << 8) |
            ((tda10021_readreg(state, 0x16) & 0x0f) << 16);
      _tda10021_writereg(state, 0x10, (tda10021_readreg(state, 0x10) & ~0xc0)
                              | (tda10021_inittab[0x10] & 0xc0));
      *ber = 10 * _ber;

      return 0;
}

static int tda10021_read_signal_strength(struct dvb_frontend* fe, u16* strength)
{
      struct tda10021_state* state = fe->demodulator_priv;

      u8 config = tda10021_readreg(state, 0x02);
      u8 gain = tda10021_readreg(state, 0x17);
      if (config & 0x02)
            /* the agc value is inverted */
            gain = ~gain;
      *strength = (gain << 8) | gain;

      return 0;
}

static int tda10021_read_snr(struct dvb_frontend* fe, u16* snr)
{
      struct tda10021_state* state = fe->demodulator_priv;

      u8 quality = ~tda10021_readreg(state, 0x18);
      *snr = (quality << 8) | quality;

      return 0;
}

static int tda10021_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
      struct tda10021_state* state = fe->demodulator_priv;

      *ucblocks = tda10021_readreg (state, 0x13) & 0x7f;
      if (*ucblocks == 0x7f)
            *ucblocks = 0xffffffff;

      /* reset uncorrected block counter */
      _tda10021_writereg (state, 0x10, tda10021_inittab[0x10] & 0xdf);
      _tda10021_writereg (state, 0x10, tda10021_inittab[0x10]);

      return 0;
}

static int tda10021_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
      struct tda10021_state* state = fe->demodulator_priv;
      int sync;
      s8 afc = 0;

      sync = tda10021_readreg(state, 0x11);
      afc = tda10021_readreg(state, 0x19);
      if (verbose) {
            /* AFC only valid when carrier has been recovered */
            printk(sync & 2 ? "DVB: TDA10021(%d): AFC (%d) %dHz\n" :
                          "DVB: TDA10021(%d): [AFC (%d) %dHz]\n",
                  state->frontend.dvb->num, afc,
                   -((s32)p->u.qam.symbol_rate * afc) >> 10);
      }

      p->inversion = ((state->reg0 & 0x20) == 0x20) ^ (state->config->invert != 0) ? INVERSION_ON : INVERSION_OFF;
      p->u.qam.modulation = ((state->reg0 >> 2) & 7) + QAM_16;

      p->u.qam.fec_inner = FEC_NONE;
      p->frequency = ((p->frequency + 31250) / 62500) * 62500;

      if (sync & 2)
            p->frequency -= ((s32)p->u.qam.symbol_rate * afc) >> 10;

      return 0;
}

static int tda10021_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
{
      struct tda10021_state* state = fe->demodulator_priv;

      if (enable) {
            lock_tuner(state);
      } else {
            unlock_tuner(state);
      }
      return 0;
}

static int tda10021_sleep(struct dvb_frontend* fe)
{
      struct tda10021_state* state = fe->demodulator_priv;

      _tda10021_writereg (state, 0x1b, 0x02);  /* pdown ADC */
      _tda10021_writereg (state, 0x00, 0x80);  /* standby */

      return 0;
}

static void tda10021_release(struct dvb_frontend* fe)
{
      struct tda10021_state* state = fe->demodulator_priv;
      kfree(state);
}

static struct dvb_frontend_ops tda10021_ops;

struct dvb_frontend* tda10021_attach(const struct tda1002x_config* config,
                             struct i2c_adapter* i2c,
                             u8 pwm)
{
      struct tda10021_state* state = NULL;
      u8 id;

      /* allocate memory for the internal state */
      state = kmalloc(sizeof(struct tda10021_state), GFP_KERNEL);
      if (state == NULL) goto error;

      /* setup the state */
      state->config = config;
      state->i2c = i2c;
      state->pwm = pwm;
      state->reg0 = tda10021_inittab[0];

      /* check if the demod is there */
      id = tda10021_readreg(state, 0x1a);
      if ((id & 0xf0) != 0x70) goto error;

      printk("TDA10021: i2c-addr = 0x%02x, id = 0x%02x\n",
             state->config->demod_address, id);

      /* create dvb_frontend */
      memcpy(&state->frontend.ops, &tda10021_ops, sizeof(struct dvb_frontend_ops));
      state->frontend.demodulator_priv = state;
      return &state->frontend;

error:
      kfree(state);
      return NULL;
}

static struct dvb_frontend_ops tda10021_ops = {

      .info = {
            .name = "Philips TDA10021 DVB-C",
            .type = FE_QAM,
            .frequency_stepsize = 62500,
            .frequency_min = 47000000,
            .frequency_max = 862000000,
            .symbol_rate_min = (XIN/2)/64,     /* SACLK/64 == (XIN/2)/64 */
            .symbol_rate_max = (XIN/2)/4,      /* SACLK/4 */
      #if 0
            .frequency_tolerance = ???,
            .symbol_rate_tolerance = ???,  /* ppm */  /* == 8% (spec p. 5) */
      #endif
            .caps = 0x400 | //FE_CAN_QAM_4
                  FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 |
                  FE_CAN_QAM_128 | FE_CAN_QAM_256 |
                  FE_CAN_FEC_AUTO
      },

      .release = tda10021_release,

      .init = tda10021_init,
      .sleep = tda10021_sleep,
      .i2c_gate_ctrl = tda10021_i2c_gate_ctrl,

      .set_frontend = tda10021_set_parameters,
      .get_frontend = tda10021_get_frontend,

      .read_status = tda10021_read_status,
      .read_ber = tda10021_read_ber,
      .read_signal_strength = tda10021_read_signal_strength,
      .read_snr = tda10021_read_snr,
      .read_ucblocks = tda10021_read_ucblocks,
};

module_param(verbose, int, 0644);
MODULE_PARM_DESC(verbose, "print AFC offset after tuning for debugging the PWM setting");

MODULE_DESCRIPTION("Philips TDA10021 DVB-C demodulator driver");
MODULE_AUTHOR("Ralph Metzler, Holger Waechtler, Markus Schulz");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(tda10021_attach);

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