607 lines
15 KiB
C
607 lines
15 KiB
C
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/*
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* mxl111sf-demod.c - driver for the MaxLinear MXL111SF DVB-T demodulator
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*
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* Copyright (C) 2010-2014 Michael Krufky <mkrufky@linuxtv.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "mxl111sf-demod.h"
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#include "mxl111sf-reg.h"
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/* debug */
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static int mxl111sf_demod_debug;
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module_param_named(debug, mxl111sf_demod_debug, int, 0644);
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MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");
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#define mxl_dbg(fmt, arg...) \
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if (mxl111sf_demod_debug) \
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mxl_printk(KERN_DEBUG, fmt, ##arg)
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/* ------------------------------------------------------------------------ */
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struct mxl111sf_demod_state {
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struct mxl111sf_state *mxl_state;
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const struct mxl111sf_demod_config *cfg;
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struct dvb_frontend fe;
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};
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/* ------------------------------------------------------------------------ */
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static int mxl111sf_demod_read_reg(struct mxl111sf_demod_state *state,
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u8 addr, u8 *data)
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{
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return (state->cfg->read_reg) ?
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state->cfg->read_reg(state->mxl_state, addr, data) :
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-EINVAL;
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}
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static int mxl111sf_demod_write_reg(struct mxl111sf_demod_state *state,
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u8 addr, u8 data)
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{
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return (state->cfg->write_reg) ?
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state->cfg->write_reg(state->mxl_state, addr, data) :
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-EINVAL;
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}
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static
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int mxl111sf_demod_program_regs(struct mxl111sf_demod_state *state,
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struct mxl111sf_reg_ctrl_info *ctrl_reg_info)
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{
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return (state->cfg->program_regs) ?
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state->cfg->program_regs(state->mxl_state, ctrl_reg_info) :
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-EINVAL;
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}
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/* ------------------------------------------------------------------------ */
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/* TPS */
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static
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int mxl1x1sf_demod_get_tps_code_rate(struct mxl111sf_demod_state *state,
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enum fe_code_rate *code_rate)
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{
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u8 val;
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int ret = mxl111sf_demod_read_reg(state, V6_CODE_RATE_TPS_REG, &val);
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/* bit<2:0> - 000:1/2, 001:2/3, 010:3/4, 011:5/6, 100:7/8 */
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if (mxl_fail(ret))
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goto fail;
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switch (val & V6_CODE_RATE_TPS_MASK) {
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case 0:
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*code_rate = FEC_1_2;
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break;
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case 1:
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*code_rate = FEC_2_3;
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break;
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case 2:
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*code_rate = FEC_3_4;
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break;
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case 3:
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*code_rate = FEC_5_6;
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break;
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case 4:
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*code_rate = FEC_7_8;
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break;
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}
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fail:
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return ret;
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}
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static
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int mxl1x1sf_demod_get_tps_modulation(struct mxl111sf_demod_state *state,
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enum fe_modulation *modulation)
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{
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u8 val;
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int ret = mxl111sf_demod_read_reg(state, V6_MODORDER_TPS_REG, &val);
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/* Constellation, 00 : QPSK, 01 : 16QAM, 10:64QAM */
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if (mxl_fail(ret))
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goto fail;
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switch ((val & V6_PARAM_CONSTELLATION_MASK) >> 4) {
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case 0:
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*modulation = QPSK;
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break;
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case 1:
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*modulation = QAM_16;
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break;
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case 2:
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*modulation = QAM_64;
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break;
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}
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fail:
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return ret;
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}
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static
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int mxl1x1sf_demod_get_tps_guard_fft_mode(struct mxl111sf_demod_state *state,
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enum fe_transmit_mode *fft_mode)
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{
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u8 val;
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int ret = mxl111sf_demod_read_reg(state, V6_MODE_TPS_REG, &val);
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/* FFT Mode, 00:2K, 01:8K, 10:4K */
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if (mxl_fail(ret))
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goto fail;
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switch ((val & V6_PARAM_FFT_MODE_MASK) >> 2) {
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case 0:
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*fft_mode = TRANSMISSION_MODE_2K;
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break;
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case 1:
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*fft_mode = TRANSMISSION_MODE_8K;
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break;
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case 2:
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*fft_mode = TRANSMISSION_MODE_4K;
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break;
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}
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fail:
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return ret;
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}
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static
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int mxl1x1sf_demod_get_tps_guard_interval(struct mxl111sf_demod_state *state,
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enum fe_guard_interval *guard)
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{
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u8 val;
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int ret = mxl111sf_demod_read_reg(state, V6_CP_TPS_REG, &val);
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/* 00:1/32, 01:1/16, 10:1/8, 11:1/4 */
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if (mxl_fail(ret))
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goto fail;
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switch ((val & V6_PARAM_GI_MASK) >> 4) {
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case 0:
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*guard = GUARD_INTERVAL_1_32;
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break;
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case 1:
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*guard = GUARD_INTERVAL_1_16;
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break;
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case 2:
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*guard = GUARD_INTERVAL_1_8;
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break;
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case 3:
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*guard = GUARD_INTERVAL_1_4;
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break;
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}
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fail:
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return ret;
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}
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static
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int mxl1x1sf_demod_get_tps_hierarchy(struct mxl111sf_demod_state *state,
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enum fe_hierarchy *hierarchy)
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{
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u8 val;
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int ret = mxl111sf_demod_read_reg(state, V6_TPS_HIERACHY_REG, &val);
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/* bit<6:4> - 000:Non hierarchy, 001:1, 010:2, 011:4 */
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if (mxl_fail(ret))
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goto fail;
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switch ((val & V6_TPS_HIERARCHY_INFO_MASK) >> 6) {
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case 0:
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*hierarchy = HIERARCHY_NONE;
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break;
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case 1:
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*hierarchy = HIERARCHY_1;
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break;
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case 2:
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*hierarchy = HIERARCHY_2;
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break;
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case 3:
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*hierarchy = HIERARCHY_4;
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break;
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}
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fail:
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return ret;
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}
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/* ------------------------------------------------------------------------ */
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/* LOCKS */
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static
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int mxl1x1sf_demod_get_sync_lock_status(struct mxl111sf_demod_state *state,
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int *sync_lock)
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{
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u8 val = 0;
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int ret = mxl111sf_demod_read_reg(state, V6_SYNC_LOCK_REG, &val);
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if (mxl_fail(ret))
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goto fail;
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*sync_lock = (val & SYNC_LOCK_MASK) >> 4;
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fail:
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return ret;
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}
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static
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int mxl1x1sf_demod_get_rs_lock_status(struct mxl111sf_demod_state *state,
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int *rs_lock)
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{
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u8 val = 0;
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int ret = mxl111sf_demod_read_reg(state, V6_RS_LOCK_DET_REG, &val);
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if (mxl_fail(ret))
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goto fail;
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*rs_lock = (val & RS_LOCK_DET_MASK) >> 3;
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fail:
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return ret;
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}
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static
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int mxl1x1sf_demod_get_tps_lock_status(struct mxl111sf_demod_state *state,
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int *tps_lock)
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{
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u8 val = 0;
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int ret = mxl111sf_demod_read_reg(state, V6_TPS_LOCK_REG, &val);
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if (mxl_fail(ret))
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goto fail;
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*tps_lock = (val & V6_PARAM_TPS_LOCK_MASK) >> 6;
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fail:
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return ret;
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}
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static
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int mxl1x1sf_demod_get_fec_lock_status(struct mxl111sf_demod_state *state,
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int *fec_lock)
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{
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u8 val = 0;
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int ret = mxl111sf_demod_read_reg(state, V6_IRQ_STATUS_REG, &val);
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if (mxl_fail(ret))
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goto fail;
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*fec_lock = (val & IRQ_MASK_FEC_LOCK) >> 4;
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fail:
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return ret;
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}
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#if 0
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static
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int mxl1x1sf_demod_get_cp_lock_status(struct mxl111sf_demod_state *state,
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int *cp_lock)
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{
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u8 val = 0;
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int ret = mxl111sf_demod_read_reg(state, V6_CP_LOCK_DET_REG, &val);
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if (mxl_fail(ret))
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goto fail;
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*cp_lock = (val & V6_CP_LOCK_DET_MASK) >> 2;
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fail:
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return ret;
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}
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#endif
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static int mxl1x1sf_demod_reset_irq_status(struct mxl111sf_demod_state *state)
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{
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return mxl111sf_demod_write_reg(state, 0x0e, 0xff);
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}
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/* ------------------------------------------------------------------------ */
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static int mxl111sf_demod_set_frontend(struct dvb_frontend *fe)
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{
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struct mxl111sf_demod_state *state = fe->demodulator_priv;
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int ret = 0;
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struct mxl111sf_reg_ctrl_info phy_pll_patch[] = {
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{0x00, 0xff, 0x01}, /* change page to 1 */
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{0x40, 0xff, 0x05},
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{0x40, 0xff, 0x01},
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{0x41, 0xff, 0xca},
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{0x41, 0xff, 0xc0},
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{0x00, 0xff, 0x00}, /* change page to 0 */
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{0, 0, 0}
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};
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mxl_dbg("()");
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if (fe->ops.tuner_ops.set_params) {
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ret = fe->ops.tuner_ops.set_params(fe);
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if (mxl_fail(ret))
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goto fail;
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msleep(50);
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}
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ret = mxl111sf_demod_program_regs(state, phy_pll_patch);
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mxl_fail(ret);
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msleep(50);
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ret = mxl1x1sf_demod_reset_irq_status(state);
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mxl_fail(ret);
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msleep(100);
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fail:
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return ret;
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}
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/* ------------------------------------------------------------------------ */
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#if 0
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/* resets TS Packet error count */
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/* After setting 7th bit of V5_PER_COUNT_RESET_REG, it should be reset to 0. */
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static
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int mxl1x1sf_demod_reset_packet_error_count(struct mxl111sf_demod_state *state)
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{
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struct mxl111sf_reg_ctrl_info reset_per_count[] = {
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{0x20, 0x01, 0x01},
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{0x20, 0x01, 0x00},
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{0, 0, 0}
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};
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return mxl111sf_demod_program_regs(state, reset_per_count);
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}
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#endif
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/* returns TS Packet error count */
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/* PER Count = FEC_PER_COUNT * (2 ** (FEC_PER_SCALE * 4)) */
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static int mxl111sf_demod_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
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{
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struct mxl111sf_demod_state *state = fe->demodulator_priv;
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u32 fec_per_count, fec_per_scale;
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u8 val;
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int ret;
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*ucblocks = 0;
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/* FEC_PER_COUNT Register */
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ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_COUNT_REG, &val);
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if (mxl_fail(ret))
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goto fail;
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fec_per_count = val;
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/* FEC_PER_SCALE Register */
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ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_SCALE_REG, &val);
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if (mxl_fail(ret))
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goto fail;
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val &= V6_FEC_PER_SCALE_MASK;
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val *= 4;
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fec_per_scale = 1 << val;
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fec_per_count *= fec_per_scale;
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*ucblocks = fec_per_count;
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fail:
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return ret;
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}
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|
|
||
|
|
#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,
|
||
|
|
enum fe_status *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;
|
||
|
|
enum fe_modulation 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)
|
||
|
|
{
|
||
|
|
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,
|
||
|
|
const 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@linuxtv.org>");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_VERSION("0.1");
|