text: /*
   *  mxl111sf-demod.c - driver for the MaxLinear MXL111SF DVB-T demodulator
   *
   *  Copyright (C) 2010 Michael Krufky <mkrufky@kernellabs.com>
   *
   *  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 "mxl111sf-demod.h"
  #include "mxl111sf-reg.h"
  
  /* debug */
  static int mxl111sf_demod_debug;
  module_param_named(debug, mxl111sf_demod_debug, int, 0644);
  MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");
  
  #define mxl_dbg(fmt, arg...) \
  	if (mxl111sf_demod_debug) \
  		mxl_printk(KERN_DEBUG, fmt, ##arg)
  
  /* ------------------------------------------------------------------------ */
  
  struct mxl111sf_demod_state {
  	struct mxl111sf_state *mxl_state;
  
  	struct mxl111sf_demod_config *cfg;
  
  	struct dvb_frontend fe;
  };
  
  /* ------------------------------------------------------------------------ */
  
  static int mxl111sf_demod_read_reg(struct mxl111sf_demod_state *state,
  				   u8 addr, u8 *data)
  {
  	return (state->cfg->read_reg) ?
  		state->cfg->read_reg(state->mxl_state, addr, data) :
  		-EINVAL;
  }
  
  static int mxl111sf_demod_write_reg(struct mxl111sf_demod_state *state,
  				    u8 addr, u8 data)
  {
  	return (state->cfg->write_reg) ?
  		state->cfg->write_reg(state->mxl_state, addr, data) :
  		-EINVAL;
  }
  
  static
  int mxl111sf_demod_program_regs(struct mxl111sf_demod_state *state,
  				struct mxl111sf_reg_ctrl_info *ctrl_reg_info)
  {
  	return (state->cfg->program_regs) ?
  		state->cfg->program_regs(state->mxl_state, ctrl_reg_info) :
  		-EINVAL;
  }
  
  /* ------------------------------------------------------------------------ */
  /* TPS */
  
  static
  int mxl1x1sf_demod_get_tps_code_rate(struct mxl111sf_demod_state *state,
  				     fe_code_rate_t *code_rate)
  {
  	u8 val;
  	int ret = mxl111sf_demod_read_reg(state, V6_CODE_RATE_TPS_REG, &val);
  	/* bit<2:0> - 000:1/2, 001:2/3, 010:3/4, 011:5/6, 100:7/8 */
  	if (mxl_fail(ret))
  		goto fail;
  
  	switch (val & V6_CODE_RATE_TPS_MASK) {
  	case 0:
  		*code_rate = FEC_1_2;
  		break;
  	case 1:
  		*code_rate = FEC_2_3;
  		break;
  	case 2:
  		*code_rate = FEC_3_4;
  		break;
  	case 3:
  		*code_rate = FEC_5_6;
  		break;
  	case 4:
  		*code_rate = FEC_7_8;
  		break;
  	}
  fail:
  	return ret;
  }
  
  static
  int mxl1x1sf_demod_get_tps_modulation(struct mxl111sf_demod_state *state,
  					 fe_modulation_t *modulation)
  {
  	u8 val;
  	int ret = mxl111sf_demod_read_reg(state, V6_MODORDER_TPS_REG, &val);
  	/* Constellation, 00 : QPSK, 01 : 16QAM, 10:64QAM */
  	if (mxl_fail(ret))
  		goto fail;
  
  	switch ((val & V6_PARAM_CONSTELLATION_MASK) >> 4) {
  	case 0:
  		*modulation = QPSK;
  		break;
  	case 1:
  		*modulation = QAM_16;
  		break;
  	case 2:
  		*modulation = QAM_64;
  		break;
  	}
  fail:
  	return ret;
  }
  
  static
  int mxl1x1sf_demod_get_tps_guard_fft_mode(struct mxl111sf_demod_state *state,
  					  fe_transmit_mode_t *fft_mode)
  {
  	u8 val;
  	int ret = mxl111sf_demod_read_reg(state, V6_MODE_TPS_REG, &val);
  	/* FFT Mode, 00:2K, 01:8K, 10:4K */
  	if (mxl_fail(ret))
  		goto fail;
  
  	switch ((val & V6_PARAM_FFT_MODE_MASK) >> 2) {
  	case 0:
  		*fft_mode = TRANSMISSION_MODE_2K;
  		break;
  	case 1:
  		*fft_mode = TRANSMISSION_MODE_8K;
  		break;
  	case 2:
  		*fft_mode = TRANSMISSION_MODE_4K;
  		break;
  	}
  fail:
  	return ret;
  }
  
  static
  int mxl1x1sf_demod_get_tps_guard_interval(struct mxl111sf_demod_state *state,
  					  fe_guard_interval_t *guard)
  {
  	u8 val;
  	int ret = mxl111sf_demod_read_reg(state, V6_CP_TPS_REG, &val);
  	/* 00:1/32, 01:1/16, 10:1/8, 11:1/4 */
  	if (mxl_fail(ret))
  		goto fail;
  
  	switch ((val & V6_PARAM_GI_MASK) >> 4) {
  	case 0:
  		*guard = GUARD_INTERVAL_1_32;
  		break;
  	case 1:
  		*guard = GUARD_INTERVAL_1_16;
  		break;
  	case 2:
  		*guard = GUARD_INTERVAL_1_8;
  		break;
  	case 3:
  		*guard = GUARD_INTERVAL_1_4;
  		break;
  	}
  fail:
  	return ret;
  }
  
  static
  int mxl1x1sf_demod_get_tps_hierarchy(struct mxl111sf_demod_state *state,
  				     fe_hierarchy_t *hierarchy)
  {
  	u8 val;
  	int ret = mxl111sf_demod_read_reg(state, V6_TPS_HIERACHY_REG, &val);
  	/* bit<6:4> - 000:Non hierarchy, 001:1, 010:2, 011:4 */
  	if (mxl_fail(ret))
  		goto fail;
  
  	switch ((val & V6_TPS_HIERARCHY_INFO_MASK) >> 6) {
  	case 0:
  		*hierarchy = HIERARCHY_NONE;
  		break;
  	case 1:
  		*hierarchy = HIERARCHY_1;
  		break;
  	case 2:
  		*hierarchy = HIERARCHY_2;
  		break;
  	case 3:
  		*hierarchy = HIERARCHY_4;
  		break;
  	}
  fail:
  	return ret;
  }
  
  /* ------------------------------------------------------------------------ */
  /* LOCKS */
  
  static
  int mxl1x1sf_demod_get_sync_lock_status(struct mxl111sf_demod_state *state,
  					int *sync_lock)
  {
  	u8 val = 0;
  	int ret = mxl111sf_demod_read_reg(state, V6_SYNC_LOCK_REG, &val);
  	if (mxl_fail(ret))
  		goto fail;
  	*sync_lock = (val & SYNC_LOCK_MASK) >> 4;
  fail:
  	return ret;
  }
  
  static
  int mxl1x1sf_demod_get_rs_lock_status(struct mxl111sf_demod_state *state,
  				      int *rs_lock)
  {
  	u8 val = 0;
  	int ret = mxl111sf_demod_read_reg(state, V6_RS_LOCK_DET_REG, &val);
  	if (mxl_fail(ret))
  		goto fail;
  	*rs_lock = (val & RS_LOCK_DET_MASK) >> 3;
  fail:
  	return ret;
  }
  
  static
  int mxl1x1sf_demod_get_tps_lock_status(struct mxl111sf_demod_state *state,
  				       int *tps_lock)
  {
  	u8 val = 0;
  	int ret = mxl111sf_demod_read_reg(state, V6_TPS_LOCK_REG, &val);
  	if (mxl_fail(ret))
  		goto fail;
  	*tps_lock = (val & V6_PARAM_TPS_LOCK_MASK) >> 6;
  fail:
  	return ret;
  }
  
  static
  int mxl1x1sf_demod_get_fec_lock_status(struct mxl111sf_demod_state *state,
  				       int *fec_lock)
  {
  	u8 val = 0;
  	int ret = mxl111sf_demod_read_reg(state, V6_IRQ_STATUS_REG, &val);
  	if (mxl_fail(ret))
  		goto fail;
  	*fec_lock = (val & IRQ_MASK_FEC_LOCK) >> 4;
  fail:
  	return ret;
  }
  
  #if 0
  static
  int mxl1x1sf_demod_get_cp_lock_status(struct mxl111sf_demod_state *state,
  				      int *cp_lock)
  {
  	u8 val = 0;
  	int ret = mxl111sf_demod_read_reg(state, V6_CP_LOCK_DET_REG, &val);
  	if (mxl_fail(ret))
  		goto fail;
  	*cp_lock = (val & V6_CP_LOCK_DET_MASK) >> 2;
  fail:
  	return ret;
  }
  #endif
  
  static int mxl1x1sf_demod_reset_irq_status(struct mxl111sf_demod_state *state)
  {
  	return mxl111sf_demod_write_reg(state, 0x0e, 0xff);
  }
  
  /* ------------------------------------------------------------------------ */
  
  static int mxl111sf_demod_set_frontend(struct dvb_frontend *fe)
  {
  	struct mxl111sf_demod_state *state = fe->demodulator_priv;
  	int ret = 0;
  
  	struct mxl111sf_reg_ctrl_info phy_pll_patch[] = {
  		{0x00, 0xff, 0x01}, /* change page to 1 */
  		{0x40, 0xff, 0x05},
  		{0x40, 0xff, 0x01},
  		{0x41, 0xff, 0xca},
  		{0x41, 0xff, 0xc0},
  		{0x00, 0xff, 0x00}, /* change page to 0 */
  		{0,    0,    0}
  	};
  
  	mxl_dbg("()");
  
  	if (fe->ops.tuner_ops.set_params) {
  		ret = fe->ops.tuner_ops.set_params(fe);
  		if (mxl_fail(ret))
  			goto fail;
  		msleep(50);
  	}
  	ret = mxl111sf_demod_program_regs(state, phy_pll_patch);
  	mxl_fail(ret);
  	msleep(50);
  	ret = mxl1x1sf_demod_reset_irq_status(state);
  	mxl_fail(ret);
  	msleep(100);
  fail:
  	return ret;
  }
  
  /* ------------------------------------------------------------------------ */
  
  #if 0
  /* resets TS Packet error count */
  /* After setting 7th bit of V5_PER_COUNT_RESET_REG, it should be reset to 0. */
  static
  int mxl1x1sf_demod_reset_packet_error_count(struct mxl111sf_demod_state *state)
  {
  	struct mxl111sf_reg_ctrl_info reset_per_count[] = {
  		{0x20, 0x01, 0x01},
  		{0x20, 0x01, 0x00},
  		{0,    0,    0}
  	};
  	return mxl111sf_demod_program_regs(state, reset_per_count);
  }
  #endif
  
  /* returns TS Packet error count */
  /* PER Count = FEC_PER_COUNT * (2 ** (FEC_PER_SCALE * 4)) */
  static int mxl111sf_demod_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
  {
  	struct mxl111sf_demod_state *state = fe->demodulator_priv;
  	u32 fec_per_count, fec_per_scale;
  	u8 val;
  	int ret;
  
  	*ucblocks = 0;
  
  	/* FEC_PER_COUNT Register */
  	ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_COUNT_REG, &val);
  	if (mxl_fail(ret))
  		goto fail;
  
  	fec_per_count = val;
  
  	/* FEC_PER_SCALE Register */
  	ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_SCALE_REG, &val);
  	if (mxl_fail(ret))
  		goto fail;
  
  	val &= V6_FEC_PER_SCALE_MASK;
  	val *= 4;
  
  	fec_per_scale = 1 << val;
  
  	fec_per_count *= fec_per_scale;
  
  	*ucblocks = fec_per_count;
  fail:
  	return ret;
  }
  
  #ifdef MXL111SF_DEMOD_ENABLE_CALCULATIONS
  /* FIXME: leaving this enabled breaks the build on some architectures,
   * and we shouldn't have any floating point math in the kernel, anyway.
   *
   * These macros need to be re-written, but it's harmless to simply
   * return zero for now. */
  #define CALCULATE_BER(avg_errors, count) \
  	((u32)(avg_errors * 4)/(count*64*188*8))
  #define CALCULATE_SNR(data) \
  	((u32)((10 * (u32)data / 64) - 2.5))
  #else
  #define CALCULATE_BER(avg_errors, count) 0
  #define CALCULATE_SNR(data) 0
  #endif
  
  static int mxl111sf_demod_read_ber(struct dvb_frontend *fe, u32 *ber)
  {
  	struct mxl111sf_demod_state *state = fe->demodulator_priv;
  	u8 val1, val2, val3;
  	int ret;
  
  	*ber = 0;
  
  	ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_LSB_REG, &val1);
  	if (mxl_fail(ret))
  		goto fail;
  	ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_MSB_REG, &val2);
  	if (mxl_fail(ret))
  		goto fail;
  	ret = mxl111sf_demod_read_reg(state, V6_N_ACCUMULATE_REG, &val3);
  	if (mxl_fail(ret))
  		goto fail;
  
  	*ber = CALCULATE_BER((val1 | (val2 << 8)), val3);
  fail:
  	return ret;
  }
  
  static int mxl111sf_demod_calc_snr(struct mxl111sf_demod_state *state,
  				   u16 *snr)
  {
  	u8 val1, val2;
  	int ret;
  
  	*snr = 0;
  
  	ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_LSB_REG, &val1);
  	if (mxl_fail(ret))
  		goto fail;
  	ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_MSB_REG, &val2);
  	if (mxl_fail(ret))
  		goto fail;
  
  	*snr = CALCULATE_SNR(val1 | ((val2 & 0x03) << 8));
  fail:
  	return ret;
  }
  
  static int mxl111sf_demod_read_snr(struct dvb_frontend *fe, u16 *snr)
  {
  	struct mxl111sf_demod_state *state = fe->demodulator_priv;
  
  	int ret = mxl111sf_demod_calc_snr(state, snr);
  	if (mxl_fail(ret))
  		goto fail;
  
  	*snr /= 10; /* 0.1 dB */
  fail:
  	return ret;
  }
  
  static int mxl111sf_demod_read_status(struct dvb_frontend *fe,
  				      fe_status_t *status)
  {
  	struct mxl111sf_demod_state *state = fe->demodulator_priv;
  	int ret, locked, cr_lock, sync_lock, fec_lock;
  
  	*status = 0;
  
  	ret = mxl1x1sf_demod_get_rs_lock_status(state, &locked);
  	if (mxl_fail(ret))
  		goto fail;
  	ret = mxl1x1sf_demod_get_tps_lock_status(state, &cr_lock);
  	if (mxl_fail(ret))
  		goto fail;
  	ret = mxl1x1sf_demod_get_sync_lock_status(state, &sync_lock);
  	if (mxl_fail(ret))
  		goto fail;
  	ret = mxl1x1sf_demod_get_fec_lock_status(state, &fec_lock);
  	if (mxl_fail(ret))
  		goto fail;
  
  	if (locked)
  		*status |= FE_HAS_SIGNAL;
  	if (cr_lock)
  		*status |= FE_HAS_CARRIER;
  	if (sync_lock)
  		*status |= FE_HAS_SYNC;
  	if (fec_lock) /* false positives? */
  		*status |= FE_HAS_VITERBI;
  
  	if ((locked) && (cr_lock) && (sync_lock))
  		*status |= FE_HAS_LOCK;
  fail:
  	return ret;
  }
  
  static int mxl111sf_demod_read_signal_strength(struct dvb_frontend *fe,
  					       u16 *signal_strength)
  {
  	struct mxl111sf_demod_state *state = fe->demodulator_priv;
  	fe_modulation_t modulation;
  	u16 snr;
  
  	mxl111sf_demod_calc_snr(state, &snr);
  	mxl1x1sf_demod_get_tps_modulation(state, &modulation);
  
  	switch (modulation) {
  	case QPSK:
  		*signal_strength = (snr >= 1300) ?
  			min(65535, snr * 44) : snr * 38;
  		break;
  	case QAM_16:
  		*signal_strength = (snr >= 1500) ?
  			min(65535, snr * 38) : snr * 33;
  		break;
  	case QAM_64:
  		*signal_strength = (snr >= 2000) ?
  			min(65535, snr * 29) : snr * 25;
  		break;
  	default:
  		*signal_strength = 0;
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int mxl111sf_demod_get_frontend(struct dvb_frontend *fe)
  {
  	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
  	struct mxl111sf_demod_state *state = fe->demodulator_priv;
  
  	mxl_dbg("()");
  #if 0
  	p->inversion = /* FIXME */ ? INVERSION_ON : INVERSION_OFF;
  #endif
  	if (fe->ops.tuner_ops.get_bandwidth)
  		fe->ops.tuner_ops.get_bandwidth(fe, &p->bandwidth_hz);
  	if (fe->ops.tuner_ops.get_frequency)
  		fe->ops.tuner_ops.get_frequency(fe, &p->frequency);
  	mxl1x1sf_demod_get_tps_code_rate(state, &p->code_rate_HP);
  	mxl1x1sf_demod_get_tps_code_rate(state, &p->code_rate_LP);
  	mxl1x1sf_demod_get_tps_modulation(state, &p->modulation);
  	mxl1x1sf_demod_get_tps_guard_fft_mode(state,
  					      &p->transmission_mode);
  	mxl1x1sf_demod_get_tps_guard_interval(state,
  					      &p->guard_interval);
  	mxl1x1sf_demod_get_tps_hierarchy(state,
  					 &p->hierarchy);
  
  	return 0;
  }
  
  static
  int mxl111sf_demod_get_tune_settings(struct dvb_frontend *fe,
  				     struct dvb_frontend_tune_settings *tune)
  {
  	tune->min_delay_ms = 1000;
  	return 0;
  }
  
  static void mxl111sf_demod_release(struct dvb_frontend *fe)
  {
  	struct mxl111sf_demod_state *state = fe->demodulator_priv;
  	mxl_dbg("()");
  	kfree(state);
  	fe->demodulator_priv = NULL;
  }
  
  static struct dvb_frontend_ops mxl111sf_demod_ops = {
  	.delsys = { SYS_DVBT },
  	.info = {
  		.name               = "MaxLinear MxL111SF DVB-T demodulator",
  		.frequency_min      = 177000000,
  		.frequency_max      = 858000000,
  		.frequency_stepsize = 166666,
  		.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_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
  			FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
  	},
  	.release              = mxl111sf_demod_release,
  #if 0
  	.init                 = mxl111sf_init,
  	.i2c_gate_ctrl        = mxl111sf_i2c_gate_ctrl,
  #endif
  	.set_frontend         = mxl111sf_demod_set_frontend,
  	.get_frontend         = mxl111sf_demod_get_frontend,
  	.get_tune_settings    = mxl111sf_demod_get_tune_settings,
  	.read_status          = mxl111sf_demod_read_status,
  	.read_signal_strength = mxl111sf_demod_read_signal_strength,
  	.read_ber             = mxl111sf_demod_read_ber,
  	.read_snr             = mxl111sf_demod_read_snr,
  	.read_ucblocks        = mxl111sf_demod_read_ucblocks,
  };
  
  struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
  					   struct mxl111sf_demod_config *cfg)
  {
  	struct mxl111sf_demod_state *state = NULL;
  
  	mxl_dbg("()");
  
  	state = kzalloc(sizeof(struct mxl111sf_demod_state), GFP_KERNEL);
  	if (state == NULL)
  		return NULL;
  
  	state->mxl_state = mxl_state;
  	state->cfg = cfg;
  
  	memcpy(&state->fe.ops, &mxl111sf_demod_ops,
  	       sizeof(struct dvb_frontend_ops));
  
  	state->fe.demodulator_priv = state;
  	return &state->fe;
  }
  EXPORT_SYMBOL_GPL(mxl111sf_demod_attach);
  
  MODULE_DESCRIPTION("MaxLinear MxL111SF DVB-T demodulator driver");
  MODULE_AUTHOR("Michael Krufky <mkrufky@kernellabs.com>");
  MODULE_LICENSE("GPL");
  MODULE_VERSION("0.1");
  
  /*
   * Local variables:
   * c-basic-offset: 8
   * End:
   */
  