Logo Search packages:      
Sourcecode: linux version File versions  Download package

mt312.c

/*
    Driver for Zarlink VP310/MT312 Satellite Channel Decoder

    Copyright (C) 2003 Andreas Oberritter <obi@linuxtv.org>

    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.

    References:
    http://products.zarlink.com/product_profiles/MT312.htm
    http://products.zarlink.com/product_profiles/SL1935.htm
*/

#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 "mt312_priv.h"
#include "mt312.h"


struct mt312_state {
      struct i2c_adapter* i2c;
      /* configuration settings */
      const struct mt312_config* config;
      struct dvb_frontend frontend;

      u8 id;
      u8 frequency;
};

static int debug;
#define dprintk(args...) \
      do { \
            if (debug) printk(KERN_DEBUG "mt312: " args); \
      } while (0)

#define MT312_SYS_CLK         90000000UL  /* 90 MHz */
#define MT312_LPOWER_SYS_CLK  60000000UL  /* 60 MHz */
#define MT312_PLL_CLK         10000000UL  /* 10 MHz */

static int mt312_read(struct mt312_state* state, const enum mt312_reg_addr reg,
                  void *buf, const size_t count)
{
      int ret;
      struct i2c_msg msg[2];
      u8 regbuf[1] = { reg };

      msg[0].addr = state->config->demod_address;
      msg[0].flags = 0;
      msg[0].buf = regbuf;
      msg[0].len = 1;
      msg[1].addr = state->config->demod_address;
      msg[1].flags = I2C_M_RD;
      msg[1].buf = buf;
      msg[1].len = count;

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

      if (ret != 2) {
            printk(KERN_ERR "%s: ret == %d\n", __FUNCTION__, ret);
            return -EREMOTEIO;
      }

      if(debug) {
            int i;
            dprintk("R(%d):", reg & 0x7f);
            for (i = 0; i < count; i++)
                  printk(" %02x", ((const u8 *) buf)[i]);
            printk("\n");
      }

      return 0;
}

static int mt312_write(struct mt312_state* state, const enum mt312_reg_addr reg,
                   const void *src, const size_t count)
{
      int ret;
      u8 buf[count + 1];
      struct i2c_msg msg;

      if(debug) {
            int i;
            dprintk("W(%d):", reg & 0x7f);
            for (i = 0; i < count; i++)
                  printk(" %02x", ((const u8 *) src)[i]);
            printk("\n");
      }

      buf[0] = reg;
      memcpy(&buf[1], src, count);

      msg.addr = state->config->demod_address;
      msg.flags = 0;
      msg.buf = buf;
      msg.len = count + 1;

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

      if (ret != 1) {
            dprintk("%s: ret == %d\n", __FUNCTION__, ret);
            return -EREMOTEIO;
      }

      return 0;
}

static inline int mt312_readreg(struct mt312_state* state,
                        const enum mt312_reg_addr reg, u8 *val)
{
      return mt312_read(state, reg, val, 1);
}

static inline int mt312_writereg(struct mt312_state* state,
                         const enum mt312_reg_addr reg, const u8 val)
{
      return mt312_write(state, reg, &val, 1);
}

static inline u32 mt312_div(u32 a, u32 b)
{
      return (a + (b / 2)) / b;
}

static int mt312_reset(struct mt312_state* state, const u8 full)
{
      return mt312_writereg(state, RESET, full ? 0x80 : 0x40);
}

static int mt312_get_inversion(struct mt312_state* state,
                         fe_spectral_inversion_t *i)
{
      int ret;
      u8 vit_mode;

      if ((ret = mt312_readreg(state, VIT_MODE, &vit_mode)) < 0)
            return ret;

      if (vit_mode & 0x80)    /* auto inversion was used */
            *i = (vit_mode & 0x40) ? INVERSION_ON : INVERSION_OFF;

      return 0;
}

static int mt312_get_symbol_rate(struct mt312_state* state, u32 *sr)
{
      int ret;
      u8 sym_rate_h;
      u8 dec_ratio;
      u16 sym_rat_op;
      u16 monitor;
      u8 buf[2];

      if ((ret = mt312_readreg(state, SYM_RATE_H, &sym_rate_h)) < 0)
            return ret;

      if (sym_rate_h & 0x80) {      /* symbol rate search was used */
            if ((ret = mt312_writereg(state, MON_CTRL, 0x03)) < 0)
                  return ret;

            if ((ret = mt312_read(state, MONITOR_H, buf, sizeof(buf))) < 0)
                  return ret;

            monitor = (buf[0] << 8) | buf[1];

            dprintk(KERN_DEBUG "sr(auto) = %u\n",
                   mt312_div(monitor * 15625, 4));
      } else {
            if ((ret = mt312_writereg(state, MON_CTRL, 0x05)) < 0)
                  return ret;

            if ((ret = mt312_read(state, MONITOR_H, buf, sizeof(buf))) < 0)
                  return ret;

            dec_ratio = ((buf[0] >> 5) & 0x07) * 32;

            if ((ret = mt312_read(state, SYM_RAT_OP_H, buf, sizeof(buf))) < 0)
                  return ret;

            sym_rat_op = (buf[0] << 8) | buf[1];

            dprintk(KERN_DEBUG "sym_rat_op=%d dec_ratio=%d\n",
                   sym_rat_op, dec_ratio);
            dprintk(KERN_DEBUG "*sr(manual) = %lu\n",
                   (((MT312_PLL_CLK * 8192) / (sym_rat_op + 8192)) *
                  2) - dec_ratio);
      }

      return 0;
}

static int mt312_get_code_rate(struct mt312_state* state, fe_code_rate_t *cr)
{
      const fe_code_rate_t fec_tab[8] =
          { FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_6_7, FEC_7_8,
            FEC_AUTO, FEC_AUTO };

      int ret;
      u8 fec_status;

      if ((ret = mt312_readreg(state, FEC_STATUS, &fec_status)) < 0)
            return ret;

      *cr = fec_tab[(fec_status >> 4) & 0x07];

      return 0;
}

static int mt312_initfe(struct dvb_frontend* fe)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;
      u8 buf[2];

      /* wake up */
      if ((ret = mt312_writereg(state, CONFIG, (state->frequency == 60 ? 0x88 : 0x8c))) < 0)
            return ret;

      /* wait at least 150 usec */
      udelay(150);

      /* full reset */
      if ((ret = mt312_reset(state, 1)) < 0)
            return ret;

// Per datasheet, write correct values. 09/28/03 ACCJr.
// If we don't do this, we won't get FE_HAS_VITERBI in the VP310.
      {
            u8 buf_def[8]={0x14, 0x12, 0x03, 0x02, 0x01, 0x00, 0x00, 0x00};

            if ((ret = mt312_write(state, VIT_SETUP, buf_def, sizeof(buf_def))) < 0)
                  return ret;
      }

      /* SYS_CLK */
      buf[0] = mt312_div((state->frequency == 60 ? MT312_LPOWER_SYS_CLK : MT312_SYS_CLK) * 2, 1000000);

      /* DISEQC_RATIO */
      buf[1] = mt312_div(MT312_PLL_CLK, 15000 * 4);

      if ((ret = mt312_write(state, SYS_CLK, buf, sizeof(buf))) < 0)
            return ret;

      if ((ret = mt312_writereg(state, SNR_THS_HIGH, 0x32)) < 0)
            return ret;

      if ((ret = mt312_writereg(state, OP_CTRL, 0x53)) < 0)
            return ret;

      /* TS_SW_LIM */
      buf[0] = 0x8c;
      buf[1] = 0x98;

      if ((ret = mt312_write(state, TS_SW_LIM_L, buf, sizeof(buf))) < 0)
            return ret;

      if ((ret = mt312_writereg(state, CS_SW_LIM, 0x69)) < 0)
            return ret;

      return 0;
}

static int mt312_send_master_cmd(struct dvb_frontend* fe,
                         struct dvb_diseqc_master_cmd *c)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;
      u8 diseqc_mode;

      if ((c->msg_len == 0) || (c->msg_len > sizeof(c->msg)))
            return -EINVAL;

      if ((ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode)) < 0)
            return ret;

      if ((ret =
           mt312_write(state, (0x80 | DISEQC_INSTR), c->msg, c->msg_len)) < 0)
            return ret;

      if ((ret =
           mt312_writereg(state, DISEQC_MODE,
                      (diseqc_mode & 0x40) | ((c->msg_len - 1) << 3)
                      | 0x04)) < 0)
            return ret;

      /* set DISEQC_MODE[2:0] to zero if a return message is expected */
      if (c->msg[0] & 0x02)
            if ((ret =
                 mt312_writereg(state, DISEQC_MODE, (diseqc_mode & 0x40))) < 0)
                  return ret;

      return 0;
}

static int mt312_send_burst(struct dvb_frontend* fe, const fe_sec_mini_cmd_t c)
{
      struct mt312_state *state = fe->demodulator_priv;
      const u8 mini_tab[2] = { 0x02, 0x03 };

      int ret;
      u8 diseqc_mode;

      if (c > SEC_MINI_B)
            return -EINVAL;

      if ((ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode)) < 0)
            return ret;

      if ((ret =
           mt312_writereg(state, DISEQC_MODE,
                      (diseqc_mode & 0x40) | mini_tab[c])) < 0)
            return ret;

      return 0;
}

static int mt312_set_tone(struct dvb_frontend* fe, const fe_sec_tone_mode_t t)
{
      struct mt312_state *state = fe->demodulator_priv;
      const u8 tone_tab[2] = { 0x01, 0x00 };

      int ret;
      u8 diseqc_mode;

      if (t > SEC_TONE_OFF)
            return -EINVAL;

      if ((ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode)) < 0)
            return ret;

      if ((ret =
           mt312_writereg(state, DISEQC_MODE,
                      (diseqc_mode & 0x40) | tone_tab[t])) < 0)
            return ret;

      return 0;
}

static int mt312_set_voltage(struct dvb_frontend* fe, const fe_sec_voltage_t v)
{
      struct mt312_state *state = fe->demodulator_priv;
      const u8 volt_tab[3] = { 0x00, 0x40, 0x00 };

      if (v > SEC_VOLTAGE_OFF)
            return -EINVAL;

      return mt312_writereg(state, DISEQC_MODE, volt_tab[v]);
}

static int mt312_read_status(struct dvb_frontend* fe, fe_status_t *s)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;
      u8 status[3];

      *s = 0;

      if ((ret = mt312_read(state, QPSK_STAT_H, status, sizeof(status))) < 0)
            return ret;

      dprintk(KERN_DEBUG "QPSK_STAT_H: 0x%02x, QPSK_STAT_L: 0x%02x, FEC_STATUS: 0x%02x\n", status[0], status[1], status[2]);

      if (status[0] & 0xc0)
            *s |= FE_HAS_SIGNAL;    /* signal noise ratio */
      if (status[0] & 0x04)
            *s |= FE_HAS_CARRIER;   /* qpsk carrier lock */
      if (status[2] & 0x02)
            *s |= FE_HAS_VITERBI;   /* viterbi lock */
      if (status[2] & 0x04)
            *s |= FE_HAS_SYNC;      /* byte align lock */
      if (status[0] & 0x01)
            *s |= FE_HAS_LOCK;      /* qpsk lock */

      return 0;
}

static int mt312_read_ber(struct dvb_frontend* fe, u32 *ber)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;
      u8 buf[3];

      if ((ret = mt312_read(state, RS_BERCNT_H, buf, 3)) < 0)
            return ret;

      *ber = ((buf[0] << 16) | (buf[1] << 8) | buf[2]) * 64;

      return 0;
}

static int mt312_read_signal_strength(struct dvb_frontend* fe, u16 *signal_strength)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;
      u8 buf[3];
      u16 agc;
      s16 err_db;

      if ((ret = mt312_read(state, AGC_H, buf, sizeof(buf))) < 0)
            return ret;

      agc = (buf[0] << 6) | (buf[1] >> 2);
      err_db = (s16) (((buf[1] & 0x03) << 14) | buf[2] << 6) >> 6;

      *signal_strength = agc;

      dprintk(KERN_DEBUG "agc=%08x err_db=%hd\n", agc, err_db);

      return 0;
}

static int mt312_read_snr(struct dvb_frontend* fe, u16 *snr)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;
      u8 buf[2];

      if ((ret = mt312_read(state, M_SNR_H, &buf, sizeof(buf))) < 0)
            return ret;

      *snr = 0xFFFF - ((((buf[0] & 0x7f) << 8) | buf[1]) << 1);

      return 0;
}

static int mt312_read_ucblocks(struct dvb_frontend* fe, u32 *ubc)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;
      u8 buf[2];

      if ((ret = mt312_read(state, RS_UBC_H, &buf, sizeof(buf))) < 0)
            return ret;

      *ubc = (buf[0] << 8) | buf[1];

      return 0;
}

static int mt312_set_frontend(struct dvb_frontend* fe,
                        struct dvb_frontend_parameters *p)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;
      u8 buf[5], config_val;
      u16 sr;

      const u8 fec_tab[10] =
          { 0x00, 0x01, 0x02, 0x04, 0x3f, 0x08, 0x10, 0x20, 0x3f, 0x3f };
      const u8 inv_tab[3] = { 0x00, 0x40, 0x80 };

      dprintk("%s: Freq %d\n", __FUNCTION__, p->frequency);

      if ((p->frequency < fe->ops.info.frequency_min)
          || (p->frequency > fe->ops.info.frequency_max))
            return -EINVAL;

      if ((p->inversion < INVERSION_OFF)
          || (p->inversion > INVERSION_ON))
            return -EINVAL;

      if ((p->u.qpsk.symbol_rate < fe->ops.info.symbol_rate_min)
          || (p->u.qpsk.symbol_rate > fe->ops.info.symbol_rate_max))
            return -EINVAL;

      if ((p->u.qpsk.fec_inner < FEC_NONE)
          || (p->u.qpsk.fec_inner > FEC_AUTO))
            return -EINVAL;

      if ((p->u.qpsk.fec_inner == FEC_4_5)
          || (p->u.qpsk.fec_inner == FEC_8_9))
            return -EINVAL;

      switch (state->id) {
      case ID_VP310:
      // For now we will do this only for the VP310.
      // It should be better for the mt312 as well, but tunning will be slower. ACCJr 09/29/03
            ret = mt312_readreg(state, CONFIG, &config_val);
            if (ret < 0)
                  return ret;
            if (p->u.qpsk.symbol_rate >= 30000000) //Note that 30MS/s should use 90MHz
            {
                  if ((config_val & 0x0c) == 0x08) { //We are running 60MHz
                        state->frequency = 90;
                        if ((ret = mt312_initfe(fe)) < 0)
                              return ret;
                  }
            }
            else
            {
                  if ((config_val & 0x0c) == 0x0C) { //We are running 90MHz
                        state->frequency = 60;
                        if ((ret = mt312_initfe(fe)) < 0)
                              return ret;
                  }
            }
            break;

      case ID_MT312:
            break;

      default:
            return -EINVAL;
      }

      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);
      }

      /* sr = (u16)(sr * 256.0 / 1000000.0) */
      sr = mt312_div(p->u.qpsk.symbol_rate * 4, 15625);

      /* SYM_RATE */
      buf[0] = (sr >> 8) & 0x3f;
      buf[1] = (sr >> 0) & 0xff;

      /* VIT_MODE */
      buf[2] = inv_tab[p->inversion] | fec_tab[p->u.qpsk.fec_inner];

      /* QPSK_CTRL */
      buf[3] = 0x40;          /* swap I and Q before QPSK demodulation */

      if (p->u.qpsk.symbol_rate < 10000000)
            buf[3] |= 0x04;   /* use afc mode */

      /* GO */
      buf[4] = 0x01;

      if ((ret = mt312_write(state, SYM_RATE_H, buf, sizeof(buf))) < 0)
            return ret;

      mt312_reset(state, 0);

      return 0;
}

static int mt312_get_frontend(struct dvb_frontend* fe,
                        struct dvb_frontend_parameters *p)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;

      if ((ret = mt312_get_inversion(state, &p->inversion)) < 0)
            return ret;

      if ((ret = mt312_get_symbol_rate(state, &p->u.qpsk.symbol_rate)) < 0)
            return ret;

      if ((ret = mt312_get_code_rate(state, &p->u.qpsk.fec_inner)) < 0)
            return ret;

      return 0;
}

static int mt312_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
{
      struct mt312_state* state = fe->demodulator_priv;

      if (enable) {
            return mt312_writereg(state, GPP_CTRL, 0x40);
      } else {
            return mt312_writereg(state, GPP_CTRL, 0x00);
      }
}

static int mt312_sleep(struct dvb_frontend* fe)
{
      struct mt312_state *state = fe->demodulator_priv;
      int ret;
      u8 config;

      /* reset all registers to defaults */
      if ((ret = mt312_reset(state, 1)) < 0)
            return ret;

      if ((ret = mt312_readreg(state, CONFIG, &config)) < 0)
            return ret;

      /* enter standby */
      if ((ret = mt312_writereg(state, CONFIG, config & 0x7f)) < 0)
            return ret;

      return 0;
}

static int mt312_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
{
      fesettings->min_delay_ms = 50;
      fesettings->step_size = 0;
      fesettings->max_drift = 0;
      return 0;
}

static void mt312_release(struct dvb_frontend* fe)
{
      struct mt312_state* state = fe->demodulator_priv;
      kfree(state);
}

static struct dvb_frontend_ops vp310_mt312_ops = {

      .info = {
            .name = "Zarlink ???? DVB-S",
            .type = FE_QPSK,
            .frequency_min = 950000,
            .frequency_max = 2150000,
            .frequency_stepsize = (MT312_PLL_CLK / 1000) / 128,
            .symbol_rate_min = MT312_SYS_CLK / 128,
            .symbol_rate_max = MT312_SYS_CLK / 2,
            .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_MUTE_TS |
                FE_CAN_RECOVER
      },

      .release = mt312_release,

      .init = mt312_initfe,
      .sleep = mt312_sleep,
      .i2c_gate_ctrl = mt312_i2c_gate_ctrl,

      .set_frontend = mt312_set_frontend,
      .get_frontend = mt312_get_frontend,
      .get_tune_settings = mt312_get_tune_settings,

      .read_status = mt312_read_status,
      .read_ber = mt312_read_ber,
      .read_signal_strength = mt312_read_signal_strength,
      .read_snr = mt312_read_snr,
      .read_ucblocks = mt312_read_ucblocks,

      .diseqc_send_master_cmd = mt312_send_master_cmd,
      .diseqc_send_burst = mt312_send_burst,
      .set_tone = mt312_set_tone,
      .set_voltage = mt312_set_voltage,
};

struct dvb_frontend* vp310_mt312_attach(const struct mt312_config* config,
                              struct i2c_adapter* i2c)
{
      struct mt312_state* state = NULL;

      /* allocate memory for the internal state */
      state = kmalloc(sizeof(struct mt312_state), GFP_KERNEL);
      if (state == NULL)
            goto error;

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

      /* check if the demod is there */
      if (mt312_readreg(state, ID, &state->id) < 0)
            goto error;

      /* create dvb_frontend */
      memcpy(&state->frontend.ops, &vp310_mt312_ops, sizeof(struct dvb_frontend_ops));
      state->frontend.demodulator_priv = state;

      switch (state->id) {
      case ID_VP310:
            strcpy(state->frontend.ops.info.name, "Zarlink VP310 DVB-S");
            state->frequency = 90;
            break;
      case ID_MT312:
            strcpy(state->frontend.ops.info.name, "Zarlink MT312 DVB-S");
            state->frequency = 60;
            break;
      default:
            printk (KERN_WARNING "Only Zarlink VP310/MT312 are supported chips.\n");
            goto error;
      }

      return &state->frontend;

error:
      kfree(state);
      return NULL;
}

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

MODULE_DESCRIPTION("Zarlink VP310/MT312 DVB-S Demodulator driver");
MODULE_AUTHOR("Andreas Oberritter <obi@linuxtv.org>");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(vp310_mt312_attach);

Generated by  Doxygen 1.6.0   Back to index