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tda8083.c

/*
    Driver for Philips TDA8083 based QPSK Demodulator

    Copyright (C) 2001 Convergence Integrated Media GmbH

    written by Ralph Metzler <ralph@convergence.de>

    adoption to the new DVB frontend API and diagnostic ioctl's
    by Holger Waechtler <holger@convergence.de>

    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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include "dvb_frontend.h"
#include "tda8083.h"


struct tda8083_state {
      struct i2c_adapter* i2c;
      /* configuration settings */
      const struct tda8083_config* config;
      struct dvb_frontend frontend;
};

static int debug;
#define dprintk(args...) \
      do { \
            if (debug) printk(KERN_DEBUG "tda8083: " args); \
      } while (0)


static u8 tda8083_init_tab [] = {
      0x04, 0x00, 0x4a, 0x79, 0x04, 0x00, 0xff, 0xea,
      0x48, 0x42, 0x79, 0x60, 0x70, 0x52, 0x9a, 0x10,
      0x0e, 0x10, 0xf2, 0xa7, 0x93, 0x0b, 0x05, 0xc8,
      0x9d, 0x00, 0x42, 0x80, 0x00, 0x60, 0x40, 0x00,
      0x00, 0x75, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x00
};


static int tda8083_writereg (struct tda8083_state* state, u8 reg, u8 data)
{
      int ret;
      u8 buf [] = { reg, data };
      struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };

      ret = i2c_transfer(state->i2c, &msg, 1);

      if (ret != 1)
            dprintk ("%s: writereg error (reg %02x, ret == %i)\n",
                  __FUNCTION__, reg, ret);

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

static int tda8083_readregs (struct tda8083_state* state, u8 reg1, u8 *b, u8 len)
{
      int ret;
      struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = &reg1, .len = 1 },
                     { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b, .len = len } };

      ret = i2c_transfer(state->i2c, msg, 2);

      if (ret != 2)
            dprintk ("%s: readreg error (reg %02x, ret == %i)\n",
                  __FUNCTION__, reg1, ret);

      return ret == 2 ? 0 : -1;
}

static inline u8 tda8083_readreg (struct tda8083_state* state, u8 reg)
{
      u8 val;

      tda8083_readregs (state, reg, &val, 1);

      return val;
}

static int tda8083_set_inversion (struct tda8083_state* state, fe_spectral_inversion_t inversion)
{
      /*  XXX FIXME: implement other modes than FEC_AUTO */
      if (inversion == INVERSION_AUTO)
            return 0;

      return -EINVAL;
}

static int tda8083_set_fec (struct tda8083_state* state, fe_code_rate_t fec)
{
      if (fec == FEC_AUTO)
            return tda8083_writereg (state, 0x07, 0xff);

      if (fec >= FEC_1_2 && fec <= FEC_8_9)
            return tda8083_writereg (state, 0x07, 1 << (FEC_8_9 - fec));

      return -EINVAL;
}

static fe_code_rate_t tda8083_get_fec (struct tda8083_state* state)
{
      u8 index;
      static fe_code_rate_t fec_tab [] = { FEC_8_9, FEC_1_2, FEC_2_3, FEC_3_4,
                               FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8 };

      index = tda8083_readreg(state, 0x0e) & 0x07;

      return fec_tab [index];
}

static int tda8083_set_symbolrate (struct tda8083_state* state, u32 srate)
{
      u32 ratio;
      u32 tmp;
      u8 filter;

      if (srate > 32000000)
            srate = 32000000;
      if (srate < 500000)
            srate = 500000;

      filter = 0;
      if (srate < 24000000)
            filter = 2;
      if (srate < 16000000)
            filter = 3;

      tmp = 31250 << 16;
      ratio = tmp / srate;

      tmp = (tmp % srate) << 8;
      ratio = (ratio << 8) + tmp / srate;

      tmp = (tmp % srate) << 8;
      ratio = (ratio << 8) + tmp / srate;

      dprintk("tda8083: ratio == %08x\n", (unsigned int) ratio);

      tda8083_writereg (state, 0x05, filter);
      tda8083_writereg (state, 0x02, (ratio >> 16) & 0xff);
      tda8083_writereg (state, 0x03, (ratio >>  8) & 0xff);
      tda8083_writereg (state, 0x04, (ratio      ) & 0xff);

      tda8083_writereg (state, 0x00, 0x3c);
      tda8083_writereg (state, 0x00, 0x04);

      return 1;
}

static void tda8083_wait_diseqc_fifo (struct tda8083_state* state, int timeout)
{
      unsigned long start = jiffies;

      while (jiffies - start < timeout &&
             !(tda8083_readreg(state, 0x02) & 0x80))
      {
            msleep(50);
      };
}

static int tda8083_set_tone (struct tda8083_state* state, fe_sec_tone_mode_t tone)
{
      tda8083_writereg (state, 0x26, 0xf1);

      switch (tone) {
      case SEC_TONE_OFF:
            return tda8083_writereg (state, 0x29, 0x00);
      case SEC_TONE_ON:
            return tda8083_writereg (state, 0x29, 0x80);
      default:
            return -EINVAL;
      };
}

static int tda8083_set_voltage (struct tda8083_state* state, fe_sec_voltage_t voltage)
{
      switch (voltage) {
      case SEC_VOLTAGE_13:
            return tda8083_writereg (state, 0x20, 0x00);
      case SEC_VOLTAGE_18:
            return tda8083_writereg (state, 0x20, 0x11);
      default:
            return -EINVAL;
      };
}

static int tda8083_send_diseqc_burst (struct tda8083_state* state, fe_sec_mini_cmd_t burst)
{
      switch (burst) {
      case SEC_MINI_A:
            tda8083_writereg (state, 0x29, (5 << 2));  /* send burst A */
            break;
      case SEC_MINI_B:
            tda8083_writereg (state, 0x29, (7 << 2));  /* send B */
            break;
      default:
            return -EINVAL;
      };

      tda8083_wait_diseqc_fifo (state, 100);

      return 0;
}

static int tda8083_send_diseqc_msg (struct dvb_frontend* fe,
                            struct dvb_diseqc_master_cmd *m)
{
      struct tda8083_state* state = fe->demodulator_priv;
      int i;

      tda8083_writereg (state, 0x29, (m->msg_len - 3) | (1 << 2)); /* enable */

      for (i=0; i<m->msg_len; i++)
            tda8083_writereg (state, 0x23 + i, m->msg[i]);

      tda8083_writereg (state, 0x29, (m->msg_len - 3) | (3 << 2)); /* send!! */

      tda8083_wait_diseqc_fifo (state, 100);

      return 0;
}

static int tda8083_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
      struct tda8083_state* state = fe->demodulator_priv;

      u8 signal = ~tda8083_readreg (state, 0x01);
      u8 sync = tda8083_readreg (state, 0x02);

      *status = 0;

      if (signal > 10)
            *status |= FE_HAS_SIGNAL;

      if (sync & 0x01)
            *status |= FE_HAS_CARRIER;

      if (sync & 0x02)
            *status |= FE_HAS_VITERBI;

      if (sync & 0x10)
            *status |= FE_HAS_SYNC;

      if (sync & 0x20) /* frontend can not lock */
            *status |= FE_TIMEDOUT;

      if ((sync & 0x1f) == 0x1f)
            *status |= FE_HAS_LOCK;

      return 0;
}

static int tda8083_read_ber(struct dvb_frontend* fe, u32* ber)
{
      struct tda8083_state* state = fe->demodulator_priv;
      int ret;
      u8 buf[3];

      if ((ret = tda8083_readregs(state, 0x0b, buf, sizeof(buf))))
            return ret;

      *ber = ((buf[0] & 0x1f) << 16) | (buf[1] << 8) | buf[2];

      return 0;
}

static int tda8083_read_signal_strength(struct dvb_frontend* fe, u16* strength)
{
      struct tda8083_state* state = fe->demodulator_priv;

      u8 signal = ~tda8083_readreg (state, 0x01);
      *strength = (signal << 8) | signal;

      return 0;
}

static int tda8083_read_snr(struct dvb_frontend* fe, u16* snr)
{
      struct tda8083_state* state = fe->demodulator_priv;

      u8 _snr = tda8083_readreg (state, 0x08);
      *snr = (_snr << 8) | _snr;

      return 0;
}

static int tda8083_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
      struct tda8083_state* state = fe->demodulator_priv;

      *ucblocks = tda8083_readreg(state, 0x0f);
      if (*ucblocks == 0xff)
            *ucblocks = 0xffffffff;

      return 0;
}

static int tda8083_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
      struct tda8083_state* state = fe->demodulator_priv;

      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);
      }

      tda8083_set_inversion (state, p->inversion);
      tda8083_set_fec (state, p->u.qpsk.fec_inner);
      tda8083_set_symbolrate (state, p->u.qpsk.symbol_rate);

      tda8083_writereg (state, 0x00, 0x3c);
      tda8083_writereg (state, 0x00, 0x04);

      return 0;
}

static int tda8083_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
      struct tda8083_state* state = fe->demodulator_priv;

      /*  FIXME: get symbolrate & frequency offset...*/
      /*p->frequency = ???;*/
      p->inversion = (tda8083_readreg (state, 0x0e) & 0x80) ?
                  INVERSION_ON : INVERSION_OFF;
      p->u.qpsk.fec_inner = tda8083_get_fec (state);
      /*p->u.qpsk.symbol_rate = tda8083_get_symbolrate (state);*/

      return 0;
}

static int tda8083_sleep(struct dvb_frontend* fe)
{
      struct tda8083_state* state = fe->demodulator_priv;

      tda8083_writereg (state, 0x00, 0x02);
      return 0;
}

static int tda8083_init(struct dvb_frontend* fe)
{
      struct tda8083_state* state = fe->demodulator_priv;
      int i;

      for (i=0; i<44; i++)
            tda8083_writereg (state, i, tda8083_init_tab[i]);

      tda8083_writereg (state, 0x00, 0x3c);
      tda8083_writereg (state, 0x00, 0x04);

      return 0;
}

static int tda8083_diseqc_send_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
{
      struct tda8083_state* state = fe->demodulator_priv;

      tda8083_send_diseqc_burst (state, burst);
      tda8083_writereg (state, 0x00, 0x3c);
      tda8083_writereg (state, 0x00, 0x04);

      return 0;
}

static int tda8083_diseqc_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
{
      struct tda8083_state* state = fe->demodulator_priv;

      tda8083_set_tone (state, tone);
      tda8083_writereg (state, 0x00, 0x3c);
      tda8083_writereg (state, 0x00, 0x04);

      return 0;
}

static int tda8083_diseqc_set_voltage(struct dvb_frontend* fe, fe_sec_voltage_t voltage)
{
      struct tda8083_state* state = fe->demodulator_priv;

      tda8083_set_voltage (state, voltage);
      tda8083_writereg (state, 0x00, 0x3c);
      tda8083_writereg (state, 0x00, 0x04);

      return 0;
}

static void tda8083_release(struct dvb_frontend* fe)
{
      struct tda8083_state* state = fe->demodulator_priv;
      kfree(state);
}

static struct dvb_frontend_ops tda8083_ops;

struct dvb_frontend* tda8083_attach(const struct tda8083_config* config,
                            struct i2c_adapter* i2c)
{
      struct tda8083_state* state = NULL;

      /* allocate memory for the internal state */
      state = kmalloc(sizeof(struct tda8083_state), GFP_KERNEL);
      if (state == NULL) goto error;

      /* setup the state */
      state->config = config;
      state->i2c = i2c;

      /* check if the demod is there */
      if ((tda8083_readreg(state, 0x00)) != 0x05) goto error;

      /* create dvb_frontend */
      memcpy(&state->frontend.ops, &tda8083_ops, sizeof(struct dvb_frontend_ops));
      state->frontend.demodulator_priv = state;
      return &state->frontend;

error:
      kfree(state);
      return NULL;
}

static struct dvb_frontend_ops tda8083_ops = {

      .info = {
            .name             = "Philips TDA8083 DVB-S",
            .type             = FE_QPSK,
            .frequency_min          = 920000,     /* TDA8060 */
            .frequency_max          = 2200000,    /* TDA8060 */
            .frequency_stepsize     = 125,   /* kHz for QPSK frontends */
      /*      .frequency_tolerance  = ???,*/
            .symbol_rate_min  = 12000000,
            .symbol_rate_max  = 30000000,
      /*      .symbol_rate_tolerance      = ???,*/
            .caps = FE_CAN_INVERSION_AUTO |
                  FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
                  FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
                  FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
                  FE_CAN_QPSK | FE_CAN_MUTE_TS
      },

      .release = tda8083_release,

      .init = tda8083_init,
      .sleep = tda8083_sleep,

      .set_frontend = tda8083_set_frontend,
      .get_frontend = tda8083_get_frontend,

      .read_status = tda8083_read_status,
      .read_signal_strength = tda8083_read_signal_strength,
      .read_snr = tda8083_read_snr,
      .read_ber = tda8083_read_ber,
      .read_ucblocks = tda8083_read_ucblocks,

      .diseqc_send_master_cmd = tda8083_send_diseqc_msg,
      .diseqc_send_burst = tda8083_diseqc_send_burst,
      .set_tone = tda8083_diseqc_set_tone,
      .set_voltage = tda8083_diseqc_set_voltage,
};

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

MODULE_DESCRIPTION("Philips TDA8083 DVB-S Demodulator");
MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(tda8083_attach);

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