diff options
Diffstat (limited to 'drivers/media/dvb-frontends/nxt6000.c')
| -rw-r--r-- | drivers/media/dvb-frontends/nxt6000.c | 624 |
1 files changed, 624 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/nxt6000.c b/drivers/media/dvb-frontends/nxt6000.c new file mode 100644 index 0000000000..e8d4940370 --- /dev/null +++ b/drivers/media/dvb-frontends/nxt6000.c @@ -0,0 +1,624 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + NxtWave Communications - NXT6000 demodulator driver + + Copyright (C) 2002-2003 Florian Schirmer <jolt@tuxbox.org> + Copyright (C) 2003 Paul Andreassen <paul@andreassen.com.au> + +*/ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/slab.h> + +#include <media/dvb_frontend.h> +#include "nxt6000_priv.h" +#include "nxt6000.h" + + + +struct nxt6000_state { + struct i2c_adapter* i2c; + /* configuration settings */ + const struct nxt6000_config* config; + struct dvb_frontend frontend; +}; + +static int debug; +#define dprintk(fmt, arg...) do { \ + if (debug) \ + printk(KERN_DEBUG pr_fmt("%s: " fmt), \ + __func__, ##arg); \ +} while (0) + +static int nxt6000_writereg(struct nxt6000_state* state, u8 reg, u8 data) +{ + u8 buf[] = { reg, data }; + struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 2 }; + int ret; + + if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1) + dprintk("nxt6000: nxt6000_write error (reg: 0x%02X, data: 0x%02X, ret: %d)\n", reg, data, ret); + + return (ret != 1) ? -EIO : 0; +} + +static u8 nxt6000_readreg(struct nxt6000_state* state, u8 reg) +{ + int ret; + u8 b0[] = { reg }; + u8 b1[] = { 0 }; + struct i2c_msg msgs[] = { + {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 1}, + {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1} + }; + + ret = i2c_transfer(state->i2c, msgs, 2); + + if (ret != 2) + dprintk("nxt6000: nxt6000_read error (reg: 0x%02X, ret: %d)\n", reg, ret); + + return b1[0]; +} + +static void nxt6000_reset(struct nxt6000_state* state) +{ + u8 val; + + val = nxt6000_readreg(state, OFDM_COR_CTL); + + nxt6000_writereg(state, OFDM_COR_CTL, val & ~COREACT); + nxt6000_writereg(state, OFDM_COR_CTL, val | COREACT); +} + +static int nxt6000_set_bandwidth(struct nxt6000_state *state, u32 bandwidth) +{ + u16 nominal_rate; + int result; + + switch (bandwidth) { + case 6000000: + nominal_rate = 0x55B7; + break; + + case 7000000: + nominal_rate = 0x6400; + break; + + case 8000000: + nominal_rate = 0x7249; + break; + + default: + return -EINVAL; + } + + if ((result = nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, nominal_rate & 0xFF)) < 0) + return result; + + return nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, (nominal_rate >> 8) & 0xFF); +} + +static int nxt6000_set_guard_interval(struct nxt6000_state *state, + enum fe_guard_interval guard_interval) +{ + switch (guard_interval) { + + case GUARD_INTERVAL_1_32: + return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x00 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03)); + + case GUARD_INTERVAL_1_16: + return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x01 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03)); + + case GUARD_INTERVAL_AUTO: + case GUARD_INTERVAL_1_8: + return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x02 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03)); + + case GUARD_INTERVAL_1_4: + return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x03 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03)); + + default: + return -EINVAL; + } +} + +static int nxt6000_set_inversion(struct nxt6000_state *state, + enum fe_spectral_inversion inversion) +{ + switch (inversion) { + + case INVERSION_OFF: + return nxt6000_writereg(state, OFDM_ITB_CTL, 0x00); + + case INVERSION_ON: + return nxt6000_writereg(state, OFDM_ITB_CTL, ITBINV); + + default: + return -EINVAL; + + } +} + +static int +nxt6000_set_transmission_mode(struct nxt6000_state *state, + enum fe_transmit_mode transmission_mode) +{ + int result; + + switch (transmission_mode) { + + case TRANSMISSION_MODE_2K: + if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x00 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0) + return result; + + return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x00 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04)); + + case TRANSMISSION_MODE_8K: + case TRANSMISSION_MODE_AUTO: + if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x02 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0) + return result; + + return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x01 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04)); + + default: + return -EINVAL; + + } +} + +static void nxt6000_setup(struct dvb_frontend* fe) +{ + struct nxt6000_state* state = fe->demodulator_priv; + + nxt6000_writereg(state, RS_COR_SYNC_PARAM, SYNC_PARAM); + nxt6000_writereg(state, BER_CTRL, /*(1 << 2) | */ (0x01 << 1) | 0x01); + nxt6000_writereg(state, VIT_BERTIME_2, 0x00); // BER Timer = 0x000200 * 256 = 131072 bits + nxt6000_writereg(state, VIT_BERTIME_1, 0x02); // + nxt6000_writereg(state, VIT_BERTIME_0, 0x00); // + nxt6000_writereg(state, VIT_COR_INTEN, 0x98); // Enable BER interrupts + nxt6000_writereg(state, VIT_COR_CTL, 0x82); // Enable BER measurement + nxt6000_writereg(state, VIT_COR_CTL, VIT_COR_RESYNC | 0x02 ); + nxt6000_writereg(state, OFDM_COR_CTL, (0x01 << 5) | (nxt6000_readreg(state, OFDM_COR_CTL) & 0x0F)); + nxt6000_writereg(state, OFDM_COR_MODEGUARD, FORCEMODE8K | 0x02); + nxt6000_writereg(state, OFDM_AGC_CTL, AGCLAST | INITIAL_AGC_BW); + nxt6000_writereg(state, OFDM_ITB_FREQ_1, 0x06); + nxt6000_writereg(state, OFDM_ITB_FREQ_2, 0x31); + nxt6000_writereg(state, OFDM_CAS_CTL, (0x01 << 7) | (0x02 << 3) | 0x04); + nxt6000_writereg(state, CAS_FREQ, 0xBB); /* CHECKME */ + nxt6000_writereg(state, OFDM_SYR_CTL, 1 << 2); + nxt6000_writereg(state, OFDM_PPM_CTL_1, PPM256); + nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, 0x49); + nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, 0x72); + nxt6000_writereg(state, ANALOG_CONTROL_0, 1 << 5); + nxt6000_writereg(state, EN_DMD_RACQ, (1 << 7) | (3 << 4) | 2); + nxt6000_writereg(state, DIAG_CONFIG, TB_SET); + + if (state->config->clock_inversion) + nxt6000_writereg(state, SUB_DIAG_MODE_SEL, CLKINVERSION); + else + nxt6000_writereg(state, SUB_DIAG_MODE_SEL, 0); + + nxt6000_writereg(state, TS_FORMAT, 0); +} + +static void nxt6000_dump_status(struct nxt6000_state *state) +{ + u8 val; + +#if 0 + pr_info("RS_COR_STAT: 0x%02X\n", + nxt6000_readreg(fe, RS_COR_STAT)); + pr_info("VIT_SYNC_STATUS: 0x%02X\n", + nxt6000_readreg(fe, VIT_SYNC_STATUS)); + pr_info("OFDM_COR_STAT: 0x%02X\n", + nxt6000_readreg(fe, OFDM_COR_STAT)); + pr_info("OFDM_SYR_STAT: 0x%02X\n", + nxt6000_readreg(fe, OFDM_SYR_STAT)); + pr_info("OFDM_TPS_RCVD_1: 0x%02X\n", + nxt6000_readreg(fe, OFDM_TPS_RCVD_1)); + pr_info("OFDM_TPS_RCVD_2: 0x%02X\n", + nxt6000_readreg(fe, OFDM_TPS_RCVD_2)); + pr_info("OFDM_TPS_RCVD_3: 0x%02X\n", + nxt6000_readreg(fe, OFDM_TPS_RCVD_3)); + pr_info("OFDM_TPS_RCVD_4: 0x%02X\n", + nxt6000_readreg(fe, OFDM_TPS_RCVD_4)); + pr_info("OFDM_TPS_RESERVED_1: 0x%02X\n", + nxt6000_readreg(fe, OFDM_TPS_RESERVED_1)); + pr_info("OFDM_TPS_RESERVED_2: 0x%02X\n", + nxt6000_readreg(fe, OFDM_TPS_RESERVED_2)); +#endif + pr_info("NXT6000 status:"); + + val = nxt6000_readreg(state, RS_COR_STAT); + + pr_cont(" DATA DESCR LOCK: %d,", val & 0x01); + pr_cont(" DATA SYNC LOCK: %d,", (val >> 1) & 0x01); + + val = nxt6000_readreg(state, VIT_SYNC_STATUS); + + pr_cont(" VITERBI LOCK: %d,", (val >> 7) & 0x01); + + switch ((val >> 4) & 0x07) { + + case 0x00: + pr_cont(" VITERBI CODERATE: 1/2,"); + break; + + case 0x01: + pr_cont(" VITERBI CODERATE: 2/3,"); + break; + + case 0x02: + pr_cont(" VITERBI CODERATE: 3/4,"); + break; + + case 0x03: + pr_cont(" VITERBI CODERATE: 5/6,"); + break; + + case 0x04: + pr_cont(" VITERBI CODERATE: 7/8,"); + break; + + default: + pr_cont(" VITERBI CODERATE: Reserved,"); + + } + + val = nxt6000_readreg(state, OFDM_COR_STAT); + + pr_cont(" CHCTrack: %d,", (val >> 7) & 0x01); + pr_cont(" TPSLock: %d,", (val >> 6) & 0x01); + pr_cont(" SYRLock: %d,", (val >> 5) & 0x01); + pr_cont(" AGCLock: %d,", (val >> 4) & 0x01); + + switch (val & 0x0F) { + + case 0x00: + pr_cont(" CoreState: IDLE,"); + break; + + case 0x02: + pr_cont(" CoreState: WAIT_AGC,"); + break; + + case 0x03: + pr_cont(" CoreState: WAIT_SYR,"); + break; + + case 0x04: + pr_cont(" CoreState: WAIT_PPM,"); + break; + + case 0x01: + pr_cont(" CoreState: WAIT_TRL,"); + break; + + case 0x05: + pr_cont(" CoreState: WAIT_TPS,"); + break; + + case 0x06: + pr_cont(" CoreState: MONITOR_TPS,"); + break; + + default: + pr_cont(" CoreState: Reserved,"); + + } + + val = nxt6000_readreg(state, OFDM_SYR_STAT); + + pr_cont(" SYRLock: %d,", (val >> 4) & 0x01); + pr_cont(" SYRMode: %s,", (val >> 2) & 0x01 ? "8K" : "2K"); + + switch ((val >> 4) & 0x03) { + + case 0x00: + pr_cont(" SYRGuard: 1/32,"); + break; + + case 0x01: + pr_cont(" SYRGuard: 1/16,"); + break; + + case 0x02: + pr_cont(" SYRGuard: 1/8,"); + break; + + case 0x03: + pr_cont(" SYRGuard: 1/4,"); + break; + } + + val = nxt6000_readreg(state, OFDM_TPS_RCVD_3); + + switch ((val >> 4) & 0x07) { + + case 0x00: + pr_cont(" TPSLP: 1/2,"); + break; + + case 0x01: + pr_cont(" TPSLP: 2/3,"); + break; + + case 0x02: + pr_cont(" TPSLP: 3/4,"); + break; + + case 0x03: + pr_cont(" TPSLP: 5/6,"); + break; + + case 0x04: + pr_cont(" TPSLP: 7/8,"); + break; + + default: + pr_cont(" TPSLP: Reserved,"); + + } + + switch (val & 0x07) { + + case 0x00: + pr_cont(" TPSHP: 1/2,"); + break; + + case 0x01: + pr_cont(" TPSHP: 2/3,"); + break; + + case 0x02: + pr_cont(" TPSHP: 3/4,"); + break; + + case 0x03: + pr_cont(" TPSHP: 5/6,"); + break; + + case 0x04: + pr_cont(" TPSHP: 7/8,"); + break; + + default: + pr_cont(" TPSHP: Reserved,"); + + } + + val = nxt6000_readreg(state, OFDM_TPS_RCVD_4); + + pr_cont(" TPSMode: %s,", val & 0x01 ? "8K" : "2K"); + + switch ((val >> 4) & 0x03) { + + case 0x00: + pr_cont(" TPSGuard: 1/32,"); + break; + + case 0x01: + pr_cont(" TPSGuard: 1/16,"); + break; + + case 0x02: + pr_cont(" TPSGuard: 1/8,"); + break; + + case 0x03: + pr_cont(" TPSGuard: 1/4,"); + break; + + } + + /* Strange magic required to gain access to RF_AGC_STATUS */ + nxt6000_readreg(state, RF_AGC_VAL_1); + val = nxt6000_readreg(state, RF_AGC_STATUS); + val = nxt6000_readreg(state, RF_AGC_STATUS); + + pr_cont(" RF AGC LOCK: %d,", (val >> 4) & 0x01); + pr_cont("\n"); +} + +static int nxt6000_read_status(struct dvb_frontend *fe, enum fe_status *status) +{ + u8 core_status; + struct nxt6000_state* state = fe->demodulator_priv; + + *status = 0; + + core_status = nxt6000_readreg(state, OFDM_COR_STAT); + + if (core_status & AGCLOCKED) + *status |= FE_HAS_SIGNAL; + + if (nxt6000_readreg(state, OFDM_SYR_STAT) & GI14_SYR_LOCK) + *status |= FE_HAS_CARRIER; + + if (nxt6000_readreg(state, VIT_SYNC_STATUS) & VITINSYNC) + *status |= FE_HAS_VITERBI; + + if (nxt6000_readreg(state, RS_COR_STAT) & RSCORESTATUS) + *status |= FE_HAS_SYNC; + + if ((core_status & TPSLOCKED) && (*status == (FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))) + *status |= FE_HAS_LOCK; + + if (debug) + nxt6000_dump_status(state); + + return 0; +} + +static int nxt6000_init(struct dvb_frontend* fe) +{ + struct nxt6000_state* state = fe->demodulator_priv; + + nxt6000_reset(state); + nxt6000_setup(fe); + + return 0; +} + +static int nxt6000_set_frontend(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *p = &fe->dtv_property_cache; + struct nxt6000_state* state = fe->demodulator_priv; + int result; + + if (fe->ops.tuner_ops.set_params) { + fe->ops.tuner_ops.set_params(fe); + if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); + } + + result = nxt6000_set_bandwidth(state, p->bandwidth_hz); + if (result < 0) + return result; + + result = nxt6000_set_guard_interval(state, p->guard_interval); + if (result < 0) + return result; + + result = nxt6000_set_transmission_mode(state, p->transmission_mode); + if (result < 0) + return result; + + result = nxt6000_set_inversion(state, p->inversion); + if (result < 0) + return result; + + msleep(500); + return 0; +} + +static void nxt6000_release(struct dvb_frontend* fe) +{ + struct nxt6000_state* state = fe->demodulator_priv; + kfree(state); +} + +static int nxt6000_read_snr(struct dvb_frontend* fe, u16* snr) +{ + struct nxt6000_state* state = fe->demodulator_priv; + + *snr = nxt6000_readreg( state, OFDM_CHC_SNR) / 8; + + return 0; +} + +static int nxt6000_read_ber(struct dvb_frontend* fe, u32* ber) +{ + struct nxt6000_state* state = fe->demodulator_priv; + + nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18 ); + + *ber = (nxt6000_readreg( state, VIT_BER_1 ) << 8 ) | + nxt6000_readreg( state, VIT_BER_0 ); + + nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18); // Clear BER Done interrupts + + return 0; +} + +static int nxt6000_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength) +{ + struct nxt6000_state* state = fe->demodulator_priv; + + *signal_strength = (short) (511 - + (nxt6000_readreg(state, AGC_GAIN_1) + + ((nxt6000_readreg(state, AGC_GAIN_2) & 0x03) << 8))); + + return 0; +} + +static int nxt6000_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune) +{ + tune->min_delay_ms = 500; + return 0; +} + +static int nxt6000_i2c_gate_ctrl(struct dvb_frontend* fe, int enable) +{ + struct nxt6000_state* state = fe->demodulator_priv; + + if (enable) { + return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x01); + } else { + return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x00); + } +} + +static const struct dvb_frontend_ops nxt6000_ops; + +struct dvb_frontend* nxt6000_attach(const struct nxt6000_config* config, + struct i2c_adapter* i2c) +{ + struct nxt6000_state* state = NULL; + + /* allocate memory for the internal state */ + state = kzalloc(sizeof(struct nxt6000_state), GFP_KERNEL); + if (state == NULL) goto error; + + /* setup the state */ + state->config = config; + state->i2c = i2c; + + /* check if the demod is there */ + if (nxt6000_readreg(state, OFDM_MSC_REV) != NXT6000ASICDEVICE) goto error; + + /* create dvb_frontend */ + memcpy(&state->frontend.ops, &nxt6000_ops, sizeof(struct dvb_frontend_ops)); + state->frontend.demodulator_priv = state; + return &state->frontend; + +error: + kfree(state); + return NULL; +} + +static const struct dvb_frontend_ops nxt6000_ops = { + .delsys = { SYS_DVBT }, + .info = { + .name = "NxtWave NXT6000 DVB-T", + .frequency_min_hz = 0, + .frequency_max_hz = 863250 * kHz, + .frequency_stepsize_hz = 62500, + /*.frequency_tolerance = *//* FIXME: 12% of SR */ + .symbol_rate_min = 0, /* FIXME */ + .symbol_rate_max = 9360000, /* FIXME */ + .symbol_rate_tolerance = 4000, + .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | + FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 | + FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO | + FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | + FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO | + FE_CAN_HIERARCHY_AUTO, + }, + + .release = nxt6000_release, + + .init = nxt6000_init, + .i2c_gate_ctrl = nxt6000_i2c_gate_ctrl, + + .get_tune_settings = nxt6000_fe_get_tune_settings, + + .set_frontend = nxt6000_set_frontend, + + .read_status = nxt6000_read_status, + .read_ber = nxt6000_read_ber, + .read_signal_strength = nxt6000_read_signal_strength, + .read_snr = nxt6000_read_snr, +}; + +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); + +MODULE_DESCRIPTION("NxtWave NXT6000 DVB-T demodulator driver"); +MODULE_AUTHOR("Florian Schirmer"); +MODULE_LICENSE("GPL"); + +EXPORT_SYMBOL_GPL(nxt6000_attach); |