diff options
Diffstat (limited to 'drivers/media/dvb-frontends/as102_fe.c')
| -rw-r--r-- | drivers/media/dvb-frontends/as102_fe.c | 480 |
1 files changed, 480 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/as102_fe.c b/drivers/media/dvb-frontends/as102_fe.c new file mode 100644 index 000000000..493665899 --- /dev/null +++ b/drivers/media/dvb-frontends/as102_fe.c @@ -0,0 +1,480 @@ +/* + * Abilis Systems Single DVB-T Receiver + * Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com> + * Copyright (C) 2010 Devin Heitmueller <dheitmueller@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, 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. + */ + +#include <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(fe_code_rate_t 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 as102_state *state = fe->demodulator_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + 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, fe_status_t *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 struct dvb_frontend_ops as102_fe_ops = { + .delsys = { SYS_DVBT }, + .info = { + .name = "Abilis AS102 DVB-T", + .frequency_min = 174000000, + .frequency_max = 862000000, + .frequency_stepsize = 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(struct as102_state), GFP_KERNEL); + if (state == NULL) { + pr_err("%s: unable to allocate memory for state\n", __func__); + 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)); + strncpy(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>"); |