| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Abilis Systems Single DVB-T Receiver |
| * Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com> |
| * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com> |
| */ |
| |
| #include <media/dvb_frontend.h> |
| |
| #include "as102_fe.h" |
| |
| struct as102_state { |
| struct dvb_frontend frontend; |
| struct as10x_demod_stats demod_stats; |
| |
| const struct as102_fe_ops *ops; |
| void *priv; |
| uint8_t elna_cfg; |
| |
| /* signal strength */ |
| uint16_t signal_strength; |
| /* bit error rate */ |
| uint32_t ber; |
| }; |
| |
| static uint8_t as102_fe_get_code_rate(enum fe_code_rate arg) |
| { |
| uint8_t c; |
| |
| switch (arg) { |
| case FEC_1_2: |
| c = CODE_RATE_1_2; |
| break; |
| case FEC_2_3: |
| c = CODE_RATE_2_3; |
| break; |
| case FEC_3_4: |
| c = CODE_RATE_3_4; |
| break; |
| case FEC_5_6: |
| c = CODE_RATE_5_6; |
| break; |
| case FEC_7_8: |
| c = CODE_RATE_7_8; |
| break; |
| default: |
| c = CODE_RATE_UNKNOWN; |
| break; |
| } |
| |
| return c; |
| } |
| |
| static int as102_fe_set_frontend(struct dvb_frontend *fe) |
| { |
| struct as102_state *state = fe->demodulator_priv; |
| struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
| struct as10x_tune_args tune_args = { 0 }; |
| |
| /* set frequency */ |
| tune_args.freq = c->frequency / 1000; |
| |
| /* fix interleaving_mode */ |
| tune_args.interleaving_mode = INTLV_NATIVE; |
| |
| switch (c->bandwidth_hz) { |
| case 8000000: |
| tune_args.bandwidth = BW_8_MHZ; |
| break; |
| case 7000000: |
| tune_args.bandwidth = BW_7_MHZ; |
| break; |
| case 6000000: |
| tune_args.bandwidth = BW_6_MHZ; |
| break; |
| default: |
| tune_args.bandwidth = BW_8_MHZ; |
| } |
| |
| switch (c->guard_interval) { |
| case GUARD_INTERVAL_1_32: |
| tune_args.guard_interval = GUARD_INT_1_32; |
| break; |
| case GUARD_INTERVAL_1_16: |
| tune_args.guard_interval = GUARD_INT_1_16; |
| break; |
| case GUARD_INTERVAL_1_8: |
| tune_args.guard_interval = GUARD_INT_1_8; |
| break; |
| case GUARD_INTERVAL_1_4: |
| tune_args.guard_interval = GUARD_INT_1_4; |
| break; |
| case GUARD_INTERVAL_AUTO: |
| default: |
| tune_args.guard_interval = GUARD_UNKNOWN; |
| break; |
| } |
| |
| switch (c->modulation) { |
| case QPSK: |
| tune_args.modulation = CONST_QPSK; |
| break; |
| case QAM_16: |
| tune_args.modulation = CONST_QAM16; |
| break; |
| case QAM_64: |
| tune_args.modulation = CONST_QAM64; |
| break; |
| default: |
| tune_args.modulation = CONST_UNKNOWN; |
| break; |
| } |
| |
| switch (c->transmission_mode) { |
| case TRANSMISSION_MODE_2K: |
| tune_args.transmission_mode = TRANS_MODE_2K; |
| break; |
| case TRANSMISSION_MODE_8K: |
| tune_args.transmission_mode = TRANS_MODE_8K; |
| break; |
| default: |
| tune_args.transmission_mode = TRANS_MODE_UNKNOWN; |
| } |
| |
| switch (c->hierarchy) { |
| case HIERARCHY_NONE: |
| tune_args.hierarchy = HIER_NONE; |
| break; |
| case HIERARCHY_1: |
| tune_args.hierarchy = HIER_ALPHA_1; |
| break; |
| case HIERARCHY_2: |
| tune_args.hierarchy = HIER_ALPHA_2; |
| break; |
| case HIERARCHY_4: |
| tune_args.hierarchy = HIER_ALPHA_4; |
| break; |
| case HIERARCHY_AUTO: |
| tune_args.hierarchy = HIER_UNKNOWN; |
| break; |
| } |
| |
| pr_debug("as102: tuner parameters: freq: %d bw: 0x%02x gi: 0x%02x\n", |
| c->frequency, |
| tune_args.bandwidth, |
| tune_args.guard_interval); |
| |
| /* |
| * Detect a hierarchy selection |
| * if HP/LP are both set to FEC_NONE, HP will be selected. |
| */ |
| if ((tune_args.hierarchy != HIER_NONE) && |
| ((c->code_rate_LP == FEC_NONE) || |
| (c->code_rate_HP == FEC_NONE))) { |
| |
| if (c->code_rate_LP == FEC_NONE) { |
| tune_args.hier_select = HIER_HIGH_PRIORITY; |
| tune_args.code_rate = |
| as102_fe_get_code_rate(c->code_rate_HP); |
| } |
| |
| if (c->code_rate_HP == FEC_NONE) { |
| tune_args.hier_select = HIER_LOW_PRIORITY; |
| tune_args.code_rate = |
| as102_fe_get_code_rate(c->code_rate_LP); |
| } |
| |
| pr_debug("as102: \thierarchy: 0x%02x selected: %s code_rate_%s: 0x%02x\n", |
| tune_args.hierarchy, |
| tune_args.hier_select == HIER_HIGH_PRIORITY ? |
| "HP" : "LP", |
| tune_args.hier_select == HIER_HIGH_PRIORITY ? |
| "HP" : "LP", |
| tune_args.code_rate); |
| } else { |
| tune_args.code_rate = |
| as102_fe_get_code_rate(c->code_rate_HP); |
| } |
| |
| /* Set frontend arguments */ |
| return state->ops->set_tune(state->priv, &tune_args); |
| } |
| |
| static int as102_fe_get_frontend(struct dvb_frontend *fe, |
| struct dtv_frontend_properties *c) |
| { |
| struct as102_state *state = fe->demodulator_priv; |
| int ret = 0; |
| struct as10x_tps tps = { 0 }; |
| |
| /* send abilis command: GET_TPS */ |
| ret = state->ops->get_tps(state->priv, &tps); |
| if (ret < 0) |
| return ret; |
| |
| /* extract constellation */ |
| switch (tps.modulation) { |
| case CONST_QPSK: |
| c->modulation = QPSK; |
| break; |
| case CONST_QAM16: |
| c->modulation = QAM_16; |
| break; |
| case CONST_QAM64: |
| c->modulation = QAM_64; |
| break; |
| } |
| |
| /* extract hierarchy */ |
| switch (tps.hierarchy) { |
| case HIER_NONE: |
| c->hierarchy = HIERARCHY_NONE; |
| break; |
| case HIER_ALPHA_1: |
| c->hierarchy = HIERARCHY_1; |
| break; |
| case HIER_ALPHA_2: |
| c->hierarchy = HIERARCHY_2; |
| break; |
| case HIER_ALPHA_4: |
| c->hierarchy = HIERARCHY_4; |
| break; |
| } |
| |
| /* extract code rate HP */ |
| switch (tps.code_rate_HP) { |
| case CODE_RATE_1_2: |
| c->code_rate_HP = FEC_1_2; |
| break; |
| case CODE_RATE_2_3: |
| c->code_rate_HP = FEC_2_3; |
| break; |
| case CODE_RATE_3_4: |
| c->code_rate_HP = FEC_3_4; |
| break; |
| case CODE_RATE_5_6: |
| c->code_rate_HP = FEC_5_6; |
| break; |
| case CODE_RATE_7_8: |
| c->code_rate_HP = FEC_7_8; |
| break; |
| } |
| |
| /* extract code rate LP */ |
| switch (tps.code_rate_LP) { |
| case CODE_RATE_1_2: |
| c->code_rate_LP = FEC_1_2; |
| break; |
| case CODE_RATE_2_3: |
| c->code_rate_LP = FEC_2_3; |
| break; |
| case CODE_RATE_3_4: |
| c->code_rate_LP = FEC_3_4; |
| break; |
| case CODE_RATE_5_6: |
| c->code_rate_LP = FEC_5_6; |
| break; |
| case CODE_RATE_7_8: |
| c->code_rate_LP = FEC_7_8; |
| break; |
| } |
| |
| /* extract guard interval */ |
| switch (tps.guard_interval) { |
| case GUARD_INT_1_32: |
| c->guard_interval = GUARD_INTERVAL_1_32; |
| break; |
| case GUARD_INT_1_16: |
| c->guard_interval = GUARD_INTERVAL_1_16; |
| break; |
| case GUARD_INT_1_8: |
| c->guard_interval = GUARD_INTERVAL_1_8; |
| break; |
| case GUARD_INT_1_4: |
| c->guard_interval = GUARD_INTERVAL_1_4; |
| break; |
| } |
| |
| /* extract transmission mode */ |
| switch (tps.transmission_mode) { |
| case TRANS_MODE_2K: |
| c->transmission_mode = TRANSMISSION_MODE_2K; |
| break; |
| case TRANS_MODE_8K: |
| c->transmission_mode = TRANSMISSION_MODE_8K; |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int as102_fe_get_tune_settings(struct dvb_frontend *fe, |
| struct dvb_frontend_tune_settings *settings) |
| { |
| |
| settings->min_delay_ms = 1000; |
| |
| return 0; |
| } |
| |
| static int as102_fe_read_status(struct dvb_frontend *fe, enum fe_status *status) |
| { |
| int ret = 0; |
| struct as102_state *state = fe->demodulator_priv; |
| struct as10x_tune_status tstate = { 0 }; |
| |
| /* send abilis command: GET_TUNE_STATUS */ |
| ret = state->ops->get_status(state->priv, &tstate); |
| if (ret < 0) |
| return ret; |
| |
| state->signal_strength = tstate.signal_strength; |
| state->ber = tstate.BER; |
| |
| switch (tstate.tune_state) { |
| case TUNE_STATUS_SIGNAL_DVB_OK: |
| *status = FE_HAS_SIGNAL | FE_HAS_CARRIER; |
| break; |
| case TUNE_STATUS_STREAM_DETECTED: |
| *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_SYNC | |
| FE_HAS_VITERBI; |
| break; |
| case TUNE_STATUS_STREAM_TUNED: |
| *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_SYNC | |
| FE_HAS_LOCK | FE_HAS_VITERBI; |
| break; |
| default: |
| *status = TUNE_STATUS_NOT_TUNED; |
| } |
| |
| pr_debug("as102: tuner status: 0x%02x, strength %d, per: %d, ber: %d\n", |
| tstate.tune_state, tstate.signal_strength, |
| tstate.PER, tstate.BER); |
| |
| if (!(*status & FE_HAS_LOCK)) { |
| memset(&state->demod_stats, 0, sizeof(state->demod_stats)); |
| return 0; |
| } |
| |
| ret = state->ops->get_stats(state->priv, &state->demod_stats); |
| if (ret < 0) |
| memset(&state->demod_stats, 0, sizeof(state->demod_stats)); |
| |
| return ret; |
| } |
| |
| /* |
| * Note: |
| * - in AS102 SNR=MER |
| * - the SNR will be returned in linear terms, i.e. not in dB |
| * - the accuracy equals ±2dB for a SNR range from 4dB to 30dB |
| * - the accuracy is >2dB for SNR values outside this range |
| */ |
| static int as102_fe_read_snr(struct dvb_frontend *fe, u16 *snr) |
| { |
| struct as102_state *state = fe->demodulator_priv; |
| |
| *snr = state->demod_stats.mer; |
| |
| return 0; |
| } |
| |
| static int as102_fe_read_ber(struct dvb_frontend *fe, u32 *ber) |
| { |
| struct as102_state *state = fe->demodulator_priv; |
| |
| *ber = state->ber; |
| |
| return 0; |
| } |
| |
| static int as102_fe_read_signal_strength(struct dvb_frontend *fe, |
| u16 *strength) |
| { |
| struct as102_state *state = fe->demodulator_priv; |
| |
| *strength = (((0xffff * 400) * state->signal_strength + 41000) * 2); |
| |
| return 0; |
| } |
| |
| static int as102_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) |
| { |
| struct as102_state *state = fe->demodulator_priv; |
| |
| if (state->demod_stats.has_started) |
| *ucblocks = state->demod_stats.bad_frame_count; |
| else |
| *ucblocks = 0; |
| |
| return 0; |
| } |
| |
| static int as102_fe_ts_bus_ctrl(struct dvb_frontend *fe, int acquire) |
| { |
| struct as102_state *state = fe->demodulator_priv; |
| |
| return state->ops->stream_ctrl(state->priv, acquire, |
| state->elna_cfg); |
| } |
| |
| static void as102_fe_release(struct dvb_frontend *fe) |
| { |
| struct as102_state *state = fe->demodulator_priv; |
| |
| kfree(state); |
| } |
| |
| |
| static const struct dvb_frontend_ops as102_fe_ops = { |
| .delsys = { SYS_DVBT }, |
| .info = { |
| .name = "Abilis AS102 DVB-T", |
| .frequency_min_hz = 174 * MHz, |
| .frequency_max_hz = 862 * MHz, |
| .frequency_stepsize_hz = 166667, |
| .caps = FE_CAN_INVERSION_AUTO |
| | 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_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QPSK |
| | FE_CAN_QAM_AUTO |
| | FE_CAN_TRANSMISSION_MODE_AUTO |
| | FE_CAN_GUARD_INTERVAL_AUTO |
| | FE_CAN_HIERARCHY_AUTO |
| | FE_CAN_RECOVER |
| | FE_CAN_MUTE_TS |
| }, |
| |
| .set_frontend = as102_fe_set_frontend, |
| .get_frontend = as102_fe_get_frontend, |
| .get_tune_settings = as102_fe_get_tune_settings, |
| |
| .read_status = as102_fe_read_status, |
| .read_snr = as102_fe_read_snr, |
| .read_ber = as102_fe_read_ber, |
| .read_signal_strength = as102_fe_read_signal_strength, |
| .read_ucblocks = as102_fe_read_ucblocks, |
| .ts_bus_ctrl = as102_fe_ts_bus_ctrl, |
| .release = as102_fe_release, |
| }; |
| |
| struct dvb_frontend *as102_attach(const char *name, |
| const struct as102_fe_ops *ops, |
| void *priv, |
| uint8_t elna_cfg) |
| { |
| struct as102_state *state; |
| struct dvb_frontend *fe; |
| |
| state = kzalloc(sizeof(*state), GFP_KERNEL); |
| if (!state) |
| return NULL; |
| |
| fe = &state->frontend; |
| fe->demodulator_priv = state; |
| state->ops = ops; |
| state->priv = priv; |
| state->elna_cfg = elna_cfg; |
| |
| /* init frontend callback ops */ |
| memcpy(&fe->ops, &as102_fe_ops, sizeof(struct dvb_frontend_ops)); |
| strscpy(fe->ops.info.name, name, sizeof(fe->ops.info.name)); |
| |
| return fe; |
| |
| } |
| EXPORT_SYMBOL_GPL(as102_attach); |
| |
| MODULE_DESCRIPTION("as102-fe"); |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Pierrick Hascoet <pierrick.hascoet@abilis.com>"); |
