480 lines
11 KiB
C
480 lines
11 KiB
C
/*
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* Abilis Systems Single DVB-T Receiver
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* Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com>
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* Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
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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, or (at your option)
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* 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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#include <media/dvb_frontend.h>
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#include "as102_fe.h"
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struct as102_state {
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struct dvb_frontend frontend;
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struct as10x_demod_stats demod_stats;
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const struct as102_fe_ops *ops;
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void *priv;
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uint8_t elna_cfg;
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/* signal strength */
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uint16_t signal_strength;
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/* bit error rate */
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uint32_t ber;
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};
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static uint8_t as102_fe_get_code_rate(enum fe_code_rate arg)
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{
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uint8_t c;
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switch (arg) {
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case FEC_1_2:
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c = CODE_RATE_1_2;
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break;
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case FEC_2_3:
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c = CODE_RATE_2_3;
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break;
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case FEC_3_4:
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c = CODE_RATE_3_4;
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break;
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case FEC_5_6:
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c = CODE_RATE_5_6;
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break;
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case FEC_7_8:
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c = CODE_RATE_7_8;
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break;
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default:
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c = CODE_RATE_UNKNOWN;
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break;
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}
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return c;
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}
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static int as102_fe_set_frontend(struct dvb_frontend *fe)
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{
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struct as102_state *state = fe->demodulator_priv;
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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struct as10x_tune_args tune_args = { 0 };
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/* set frequency */
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tune_args.freq = c->frequency / 1000;
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/* fix interleaving_mode */
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tune_args.interleaving_mode = INTLV_NATIVE;
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switch (c->bandwidth_hz) {
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case 8000000:
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tune_args.bandwidth = BW_8_MHZ;
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break;
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case 7000000:
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tune_args.bandwidth = BW_7_MHZ;
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break;
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case 6000000:
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tune_args.bandwidth = BW_6_MHZ;
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break;
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default:
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tune_args.bandwidth = BW_8_MHZ;
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}
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switch (c->guard_interval) {
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case GUARD_INTERVAL_1_32:
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tune_args.guard_interval = GUARD_INT_1_32;
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break;
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case GUARD_INTERVAL_1_16:
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tune_args.guard_interval = GUARD_INT_1_16;
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break;
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case GUARD_INTERVAL_1_8:
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tune_args.guard_interval = GUARD_INT_1_8;
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break;
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case GUARD_INTERVAL_1_4:
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tune_args.guard_interval = GUARD_INT_1_4;
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break;
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case GUARD_INTERVAL_AUTO:
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default:
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tune_args.guard_interval = GUARD_UNKNOWN;
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break;
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}
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switch (c->modulation) {
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case QPSK:
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tune_args.modulation = CONST_QPSK;
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break;
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case QAM_16:
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tune_args.modulation = CONST_QAM16;
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break;
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case QAM_64:
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tune_args.modulation = CONST_QAM64;
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break;
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default:
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tune_args.modulation = CONST_UNKNOWN;
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break;
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}
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switch (c->transmission_mode) {
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case TRANSMISSION_MODE_2K:
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tune_args.transmission_mode = TRANS_MODE_2K;
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break;
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case TRANSMISSION_MODE_8K:
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tune_args.transmission_mode = TRANS_MODE_8K;
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break;
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default:
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tune_args.transmission_mode = TRANS_MODE_UNKNOWN;
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}
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switch (c->hierarchy) {
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case HIERARCHY_NONE:
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tune_args.hierarchy = HIER_NONE;
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break;
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case HIERARCHY_1:
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tune_args.hierarchy = HIER_ALPHA_1;
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break;
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case HIERARCHY_2:
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tune_args.hierarchy = HIER_ALPHA_2;
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break;
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case HIERARCHY_4:
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tune_args.hierarchy = HIER_ALPHA_4;
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break;
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case HIERARCHY_AUTO:
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tune_args.hierarchy = HIER_UNKNOWN;
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break;
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}
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pr_debug("as102: tuner parameters: freq: %d bw: 0x%02x gi: 0x%02x\n",
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c->frequency,
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tune_args.bandwidth,
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tune_args.guard_interval);
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/*
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* Detect a hierarchy selection
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* if HP/LP are both set to FEC_NONE, HP will be selected.
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*/
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if ((tune_args.hierarchy != HIER_NONE) &&
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((c->code_rate_LP == FEC_NONE) ||
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(c->code_rate_HP == FEC_NONE))) {
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if (c->code_rate_LP == FEC_NONE) {
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tune_args.hier_select = HIER_HIGH_PRIORITY;
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tune_args.code_rate =
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as102_fe_get_code_rate(c->code_rate_HP);
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}
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if (c->code_rate_HP == FEC_NONE) {
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tune_args.hier_select = HIER_LOW_PRIORITY;
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tune_args.code_rate =
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as102_fe_get_code_rate(c->code_rate_LP);
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}
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pr_debug("as102: \thierarchy: 0x%02x selected: %s code_rate_%s: 0x%02x\n",
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tune_args.hierarchy,
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tune_args.hier_select == HIER_HIGH_PRIORITY ?
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"HP" : "LP",
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tune_args.hier_select == HIER_HIGH_PRIORITY ?
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"HP" : "LP",
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tune_args.code_rate);
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} else {
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tune_args.code_rate =
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as102_fe_get_code_rate(c->code_rate_HP);
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}
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/* Set frontend arguments */
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return state->ops->set_tune(state->priv, &tune_args);
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}
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static int as102_fe_get_frontend(struct dvb_frontend *fe,
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struct dtv_frontend_properties *c)
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{
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struct as102_state *state = fe->demodulator_priv;
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int ret = 0;
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struct as10x_tps tps = { 0 };
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/* send abilis command: GET_TPS */
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ret = state->ops->get_tps(state->priv, &tps);
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if (ret < 0)
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return ret;
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/* extract constellation */
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switch (tps.modulation) {
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case CONST_QPSK:
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c->modulation = QPSK;
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break;
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case CONST_QAM16:
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c->modulation = QAM_16;
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break;
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case CONST_QAM64:
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c->modulation = QAM_64;
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break;
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}
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/* extract hierarchy */
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switch (tps.hierarchy) {
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case HIER_NONE:
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c->hierarchy = HIERARCHY_NONE;
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break;
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case HIER_ALPHA_1:
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c->hierarchy = HIERARCHY_1;
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break;
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case HIER_ALPHA_2:
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c->hierarchy = HIERARCHY_2;
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break;
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case HIER_ALPHA_4:
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c->hierarchy = HIERARCHY_4;
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break;
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}
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/* extract code rate HP */
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switch (tps.code_rate_HP) {
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case CODE_RATE_1_2:
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c->code_rate_HP = FEC_1_2;
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break;
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case CODE_RATE_2_3:
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c->code_rate_HP = FEC_2_3;
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break;
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case CODE_RATE_3_4:
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c->code_rate_HP = FEC_3_4;
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break;
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case CODE_RATE_5_6:
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c->code_rate_HP = FEC_5_6;
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break;
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case CODE_RATE_7_8:
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c->code_rate_HP = FEC_7_8;
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break;
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}
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/* extract code rate LP */
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switch (tps.code_rate_LP) {
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case CODE_RATE_1_2:
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c->code_rate_LP = FEC_1_2;
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break;
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case CODE_RATE_2_3:
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c->code_rate_LP = FEC_2_3;
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break;
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case CODE_RATE_3_4:
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c->code_rate_LP = FEC_3_4;
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break;
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case CODE_RATE_5_6:
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c->code_rate_LP = FEC_5_6;
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break;
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case CODE_RATE_7_8:
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c->code_rate_LP = FEC_7_8;
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break;
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}
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/* extract guard interval */
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switch (tps.guard_interval) {
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case GUARD_INT_1_32:
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c->guard_interval = GUARD_INTERVAL_1_32;
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break;
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case GUARD_INT_1_16:
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c->guard_interval = GUARD_INTERVAL_1_16;
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break;
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case GUARD_INT_1_8:
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c->guard_interval = GUARD_INTERVAL_1_8;
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break;
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case GUARD_INT_1_4:
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c->guard_interval = GUARD_INTERVAL_1_4;
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break;
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}
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/* extract transmission mode */
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switch (tps.transmission_mode) {
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case TRANS_MODE_2K:
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c->transmission_mode = TRANSMISSION_MODE_2K;
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break;
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case TRANS_MODE_8K:
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c->transmission_mode = TRANSMISSION_MODE_8K;
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break;
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}
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return 0;
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}
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static int as102_fe_get_tune_settings(struct dvb_frontend *fe,
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struct dvb_frontend_tune_settings *settings) {
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settings->min_delay_ms = 1000;
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return 0;
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}
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static int as102_fe_read_status(struct dvb_frontend *fe, enum fe_status *status)
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{
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int ret = 0;
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struct as102_state *state = fe->demodulator_priv;
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struct as10x_tune_status tstate = { 0 };
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/* send abilis command: GET_TUNE_STATUS */
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ret = state->ops->get_status(state->priv, &tstate);
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if (ret < 0)
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return ret;
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state->signal_strength = tstate.signal_strength;
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state->ber = tstate.BER;
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switch (tstate.tune_state) {
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case TUNE_STATUS_SIGNAL_DVB_OK:
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*status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
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break;
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case TUNE_STATUS_STREAM_DETECTED:
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*status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_SYNC |
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FE_HAS_VITERBI;
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break;
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case TUNE_STATUS_STREAM_TUNED:
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*status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_SYNC |
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FE_HAS_LOCK | FE_HAS_VITERBI;
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break;
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default:
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*status = TUNE_STATUS_NOT_TUNED;
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}
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pr_debug("as102: tuner status: 0x%02x, strength %d, per: %d, ber: %d\n",
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tstate.tune_state, tstate.signal_strength,
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tstate.PER, tstate.BER);
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if (!(*status & FE_HAS_LOCK)) {
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memset(&state->demod_stats, 0, sizeof(state->demod_stats));
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return 0;
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}
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ret = state->ops->get_stats(state->priv, &state->demod_stats);
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if (ret < 0)
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memset(&state->demod_stats, 0, sizeof(state->demod_stats));
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return ret;
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}
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/*
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* Note:
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* - in AS102 SNR=MER
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* - the SNR will be returned in linear terms, i.e. not in dB
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* - the accuracy equals ±2dB for a SNR range from 4dB to 30dB
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* - the accuracy is >2dB for SNR values outside this range
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*/
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static int as102_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
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{
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struct as102_state *state = fe->demodulator_priv;
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*snr = state->demod_stats.mer;
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return 0;
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}
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static int as102_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
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{
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struct as102_state *state = fe->demodulator_priv;
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*ber = state->ber;
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return 0;
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}
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static int as102_fe_read_signal_strength(struct dvb_frontend *fe,
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u16 *strength)
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{
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struct as102_state *state = fe->demodulator_priv;
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*strength = (((0xffff * 400) * state->signal_strength + 41000) * 2);
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return 0;
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}
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static int as102_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
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{
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struct as102_state *state = fe->demodulator_priv;
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if (state->demod_stats.has_started)
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*ucblocks = state->demod_stats.bad_frame_count;
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else
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*ucblocks = 0;
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return 0;
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}
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static int as102_fe_ts_bus_ctrl(struct dvb_frontend *fe, int acquire)
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{
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struct as102_state *state = fe->demodulator_priv;
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return state->ops->stream_ctrl(state->priv, acquire,
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state->elna_cfg);
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}
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static void as102_fe_release(struct dvb_frontend *fe)
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{
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struct as102_state *state = fe->demodulator_priv;
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kfree(state);
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}
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static const struct dvb_frontend_ops as102_fe_ops = {
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.delsys = { SYS_DVBT },
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.info = {
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.name = "Abilis AS102 DVB-T",
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.frequency_min_hz = 174 * MHz,
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.frequency_max_hz = 862 * MHz,
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.frequency_stepsize_hz = 166667,
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.caps = FE_CAN_INVERSION_AUTO
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| FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4
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| FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO
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| FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QPSK
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| FE_CAN_QAM_AUTO
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| FE_CAN_TRANSMISSION_MODE_AUTO
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| FE_CAN_GUARD_INTERVAL_AUTO
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| FE_CAN_HIERARCHY_AUTO
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| FE_CAN_RECOVER
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| FE_CAN_MUTE_TS
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},
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.set_frontend = as102_fe_set_frontend,
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.get_frontend = as102_fe_get_frontend,
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.get_tune_settings = as102_fe_get_tune_settings,
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.read_status = as102_fe_read_status,
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.read_snr = as102_fe_read_snr,
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.read_ber = as102_fe_read_ber,
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.read_signal_strength = as102_fe_read_signal_strength,
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.read_ucblocks = as102_fe_read_ucblocks,
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.ts_bus_ctrl = as102_fe_ts_bus_ctrl,
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.release = as102_fe_release,
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};
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struct dvb_frontend *as102_attach(const char *name,
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const struct as102_fe_ops *ops,
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void *priv,
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uint8_t elna_cfg)
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{
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struct as102_state *state;
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struct dvb_frontend *fe;
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state)
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return NULL;
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fe = &state->frontend;
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fe->demodulator_priv = state;
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state->ops = ops;
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state->priv = priv;
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state->elna_cfg = elna_cfg;
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/* init frontend callback ops */
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memcpy(&fe->ops, &as102_fe_ops, sizeof(struct dvb_frontend_ops));
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strncpy(fe->ops.info.name, name, sizeof(fe->ops.info.name));
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return fe;
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}
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EXPORT_SYMBOL_GPL(as102_attach);
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MODULE_DESCRIPTION("as102-fe");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pierrick Hascoet <pierrick.hascoet@abilis.com>");
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