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zl10353.c

/*
 * Driver for Zarlink DVB-T ZL10353 demodulator
 *
 * Copyright (C) 2006 Christopher Pascoe <c.pascoe@itee.uq.edu.au>
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/slab.h>

#include "dvb_frontend.h"
#include "zl10353_priv.h"
#include "zl10353.h"

struct zl10353_state {
      struct i2c_adapter *i2c;
      struct dvb_frontend frontend;

      struct zl10353_config config;
};

static int debug;
#define dprintk(args...) \
      do { \
            if (debug) printk(KERN_DEBUG "zl10353: " args); \
      } while (0)

static int debug_regs = 0;

static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
{
      struct zl10353_state *state = fe->demodulator_priv;
      u8 buf[2] = { reg, val };
      struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
                         .buf = buf, .len = 2 };
      int err = i2c_transfer(state->i2c, &msg, 1);
      if (err != 1) {
            printk("zl10353: write to reg %x failed (err = %d)!\n", reg, err);
            return err;
      }
      return 0;
}

static int zl10353_write(struct dvb_frontend *fe, u8 *ibuf, int ilen)
{
      int err, i;
      for (i = 0; i < ilen - 1; i++)
            if ((err = zl10353_single_write(fe, ibuf[0] + i, ibuf[i + 1])))
                  return err;

      return 0;
}

static int zl10353_read_register(struct zl10353_state *state, u8 reg)
{
      int ret;
      u8 b0[1] = { reg };
      u8 b1[1] = { 0 };
      struct i2c_msg msg[2] = { { .addr = state->config.demod_address,
                            .flags = 0,
                            .buf = b0, .len = 1 },
                          { .addr = state->config.demod_address,
                            .flags = I2C_M_RD,
                            .buf = b1, .len = 1 } };

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

      if (ret != 2) {
            printk("%s: readreg error (reg=%d, ret==%i)\n",
                   __FUNCTION__, reg, ret);
            return ret;
      }

      return b1[0];
}

static void zl10353_dump_regs(struct dvb_frontend *fe)
{
      struct zl10353_state *state = fe->demodulator_priv;
      char buf[52], buf2[4];
      int ret;
      u8 reg;

      /* Dump all registers. */
      for (reg = 0; ; reg++) {
            if (reg % 16 == 0) {
                  if (reg)
                        printk(KERN_DEBUG "%s\n", buf);
                  sprintf(buf, "%02x: ", reg);
            }
            ret = zl10353_read_register(state, reg);
            if (ret >= 0)
                  sprintf(buf2, "%02x ", (u8)ret);
            else
                  strcpy(buf2, "-- ");
            strcat(buf, buf2);
            if (reg == 0xff)
                  break;
      }
      printk(KERN_DEBUG "%s\n", buf);
}

static void zl10353_calc_nominal_rate(struct dvb_frontend *fe,
                              enum fe_bandwidth bandwidth,
                              u16 *nominal_rate)
{
      u32 adc_clock = 45056; /* 45.056 MHz */
      u8 bw;
      struct zl10353_state *state = fe->demodulator_priv;

      if (state->config.adc_clock)
            adc_clock = state->config.adc_clock;

      switch (bandwidth) {
      case BANDWIDTH_6_MHZ:
            bw = 6;
            break;
      case BANDWIDTH_7_MHZ:
            bw = 7;
            break;
      case BANDWIDTH_8_MHZ:
      default:
            bw = 8;
            break;
      }

      *nominal_rate = (bw * (1 << 23) / 7 * 125 + adc_clock / 2) / adc_clock;

      dprintk("%s: bw %d, adc_clock %d => 0x%x\n",
            __FUNCTION__, bw, adc_clock, *nominal_rate);
}

static int zl10353_sleep(struct dvb_frontend *fe)
{
      static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 };

      zl10353_write(fe, zl10353_softdown, sizeof(zl10353_softdown));
      return 0;
}

static int zl10353_set_parameters(struct dvb_frontend *fe,
                          struct dvb_frontend_parameters *param)
{
      struct zl10353_state *state = fe->demodulator_priv;
      u16 nominal_rate;
      u8 pllbuf[6] = { 0x67 };

      /* These settings set "auto-everything" and start the FSM. */
      zl10353_single_write(fe, 0x55, 0x80);
      udelay(200);
      zl10353_single_write(fe, 0xEA, 0x01);
      udelay(200);
      zl10353_single_write(fe, 0xEA, 0x00);

      zl10353_single_write(fe, 0x56, 0x28);
      zl10353_single_write(fe, 0x89, 0x20);
      zl10353_single_write(fe, 0x5E, 0x00);

      zl10353_calc_nominal_rate(fe, param->u.ofdm.bandwidth, &nominal_rate);
      zl10353_single_write(fe, TRL_NOMINAL_RATE_1, msb(nominal_rate));
      zl10353_single_write(fe, TRL_NOMINAL_RATE_0, lsb(nominal_rate));

      zl10353_single_write(fe, 0x6C, 0xCD);
      zl10353_single_write(fe, 0x6D, 0x7E);
      if (fe->ops.i2c_gate_ctrl)
            fe->ops.i2c_gate_ctrl(fe, 0);

      // if there is no attached secondary tuner, we call set_params to program
      // a potential tuner attached somewhere else
      if (state->config.no_tuner) {
            if (fe->ops.tuner_ops.set_params) {
                  fe->ops.tuner_ops.set_params(fe, param);
                  if (fe->ops.i2c_gate_ctrl)
                        fe->ops.i2c_gate_ctrl(fe, 0);
            }
      }

      // if pllbuf is defined, retrieve the settings
      if (fe->ops.tuner_ops.calc_regs) {
            fe->ops.tuner_ops.calc_regs(fe, param, pllbuf+1, 5);
            pllbuf[1] <<= 1;
      } else {
            // fake pllbuf settings
            pllbuf[1] = 0x61 << 1;
            pllbuf[2] = 0;
            pllbuf[3] = 0;
            pllbuf[3] = 0;
            pllbuf[4] = 0;
      }

      // there is no call to _just_ start decoding, so we send the pllbuf anyway
      // even if there isn't a PLL attached to the secondary bus
      zl10353_write(fe, pllbuf, sizeof(pllbuf));

      zl10353_single_write(fe, 0x5F, 0x13);
      zl10353_single_write(fe, 0x70, 0x01);
      udelay(250);
      zl10353_single_write(fe, 0xE4, 0x00);
      zl10353_single_write(fe, 0xE5, 0x2A);
      zl10353_single_write(fe, 0xE9, 0x02);
      zl10353_single_write(fe, 0xE7, 0x40);
      zl10353_single_write(fe, 0xE8, 0x10);

      return 0;
}

static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
      struct zl10353_state *state = fe->demodulator_priv;
      int s6, s7, s8;

      if ((s6 = zl10353_read_register(state, STATUS_6)) < 0)
            return -EREMOTEIO;
      if ((s7 = zl10353_read_register(state, STATUS_7)) < 0)
            return -EREMOTEIO;
      if ((s8 = zl10353_read_register(state, STATUS_8)) < 0)
            return -EREMOTEIO;

      *status = 0;
      if (s6 & (1 << 2))
            *status |= FE_HAS_CARRIER;
      if (s6 & (1 << 1))
            *status |= FE_HAS_VITERBI;
      if (s6 & (1 << 5))
            *status |= FE_HAS_LOCK;
      if (s7 & (1 << 4))
            *status |= FE_HAS_SYNC;
      if (s8 & (1 << 6))
            *status |= FE_HAS_SIGNAL;

      if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
          (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
            *status &= ~FE_HAS_LOCK;

      return 0;
}

static int zl10353_read_ber(struct dvb_frontend *fe, u32 *ber)
{
      struct zl10353_state *state = fe->demodulator_priv;

      *ber = zl10353_read_register(state, RS_ERR_CNT_2) << 16 |
             zl10353_read_register(state, RS_ERR_CNT_1) << 8 |
             zl10353_read_register(state, RS_ERR_CNT_0);

      return 0;
}

static int zl10353_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
{
      struct zl10353_state *state = fe->demodulator_priv;

      u16 signal = zl10353_read_register(state, AGC_GAIN_1) << 10 |
                 zl10353_read_register(state, AGC_GAIN_0) << 2 | 3;

      *strength = ~signal;

      return 0;
}

static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr)
{
      struct zl10353_state *state = fe->demodulator_priv;
      u8 _snr;

      if (debug_regs)
            zl10353_dump_regs(fe);

      _snr = zl10353_read_register(state, SNR);
      *snr = (_snr << 8) | _snr;

      return 0;
}

static int zl10353_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
      struct zl10353_state *state = fe->demodulator_priv;

      *ucblocks = zl10353_read_register(state, RS_UBC_1) << 8 |
                zl10353_read_register(state, RS_UBC_0);

      return 0;
}

static int zl10353_get_tune_settings(struct dvb_frontend *fe,
                             struct dvb_frontend_tune_settings
                               *fe_tune_settings)
{
      fe_tune_settings->min_delay_ms = 1000;
      fe_tune_settings->step_size = 0;
      fe_tune_settings->max_drift = 0;

      return 0;
}

static int zl10353_init(struct dvb_frontend *fe)
{
      struct zl10353_state *state = fe->demodulator_priv;
      u8 zl10353_reset_attach[6] = { 0x50, 0x03, 0x64, 0x46, 0x15, 0x0F };
      int rc = 0;

      if (debug_regs)
            zl10353_dump_regs(fe);
      if (state->config.parallel_ts)
            zl10353_reset_attach[2] &= ~0x20;

      /* Do a "hard" reset if not already done */
      if (zl10353_read_register(state, 0x50) != zl10353_reset_attach[1] ||
          zl10353_read_register(state, 0x51) != zl10353_reset_attach[2]) {
            rc = zl10353_write(fe, zl10353_reset_attach,
                           sizeof(zl10353_reset_attach));
            if (debug_regs)
                  zl10353_dump_regs(fe);
      }

      return 0;
}

static int zl10353_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
{
      u8 val = 0x0a;

      if (enable)
            val |= 0x10;

      return zl10353_single_write(fe, 0x62, val);
}

static void zl10353_release(struct dvb_frontend *fe)
{
      struct zl10353_state *state = fe->demodulator_priv;
      kfree(state);
}

static struct dvb_frontend_ops zl10353_ops;

struct dvb_frontend *zl10353_attach(const struct zl10353_config *config,
                            struct i2c_adapter *i2c)
{
      struct zl10353_state *state = NULL;

      /* allocate memory for the internal state */
      state = kzalloc(sizeof(struct zl10353_state), GFP_KERNEL);
      if (state == NULL)
            goto error;

      /* setup the state */
      state->i2c = i2c;
      memcpy(&state->config, config, sizeof(struct zl10353_config));

      /* check if the demod is there */
      if (zl10353_read_register(state, CHIP_ID) != ID_ZL10353)
            goto error;

      /* create dvb_frontend */
      memcpy(&state->frontend.ops, &zl10353_ops, sizeof(struct dvb_frontend_ops));
      state->frontend.demodulator_priv = state;

      return &state->frontend;
error:
      kfree(state);
      return NULL;
}

static struct dvb_frontend_ops zl10353_ops = {

      .info = {
            .name             = "Zarlink ZL10353 DVB-T",
            .type             = FE_OFDM,
            .frequency_min          = 174000000,
            .frequency_max          = 862000000,
            .frequency_stepsize     = 166667,
            .frequency_tolerance    = 0,
            .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
                  FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
                  FE_CAN_FEC_AUTO |
                  FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
                  FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
                  FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
                  FE_CAN_MUTE_TS
      },

      .release = zl10353_release,

      .init = zl10353_init,
      .sleep = zl10353_sleep,
      .i2c_gate_ctrl = zl10353_i2c_gate_ctrl,
      .write = zl10353_write,

      .set_frontend = zl10353_set_parameters,
      .get_tune_settings = zl10353_get_tune_settings,

      .read_status = zl10353_read_status,
      .read_ber = zl10353_read_ber,
      .read_signal_strength = zl10353_read_signal_strength,
      .read_snr = zl10353_read_snr,
      .read_ucblocks = zl10353_read_ucblocks,
};

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

module_param(debug_regs, int, 0644);
MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off).");

MODULE_DESCRIPTION("Zarlink ZL10353 DVB-T demodulator driver");
MODULE_AUTHOR("Chris Pascoe");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(zl10353_attach);

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