diff options
Diffstat (limited to 'drivers/media/dvb-frontends/dib7000p.c')
| -rw-r--r-- | drivers/media/dvb-frontends/dib7000p.c | 321 |
1 files changed, 320 insertions, 1 deletions
diff --git a/drivers/media/dvb-frontends/dib7000p.c b/drivers/media/dvb-frontends/dib7000p.c index d36fa0d..c41f90d 100644 --- a/drivers/media/dvb-frontends/dib7000p.c +++ b/drivers/media/dvb-frontends/dib7000p.c @@ -11,6 +11,7 @@ #include <linux/slab.h> #include <linux/i2c.h> #include <linux/mutex.h> +#include <asm/div64.h> #include "dvb_math.h" #include "dvb_frontend.h" @@ -72,6 +73,12 @@ struct dib7000p_state { struct mutex i2c_buffer_lock; u8 input_mode_mpeg; + + /* for DVBv5 stats */ + s64 old_ucb; + unsigned long per_jiffies_stats; + unsigned long ber_jiffies_stats; + unsigned long get_stats_time; }; enum dib7000p_power_mode { @@ -631,6 +638,8 @@ static u16 dib7000p_defaults[] = { 0, }; +static void dib7000p_reset_stats(struct dvb_frontend *fe); + static int dib7000p_demod_reset(struct dib7000p_state *state) { dib7000p_set_power_mode(state, DIB7000P_POWER_ALL); @@ -1354,6 +1363,9 @@ static int dib7000p_tune(struct dvb_frontend *demod) dib7000p_spur_protect(state, ch->frequency / 1000, BANDWIDTH_TO_KHZ(ch->bandwidth_hz)); dib7000p_set_bandwidth(state, BANDWIDTH_TO_KHZ(ch->bandwidth_hz)); + + dib7000p_reset_stats(demod); + return 0; } @@ -1546,6 +1558,8 @@ static int dib7000p_set_frontend(struct dvb_frontend *fe) return ret; } +static int dib7000p_get_stats(struct dvb_frontend *fe, fe_status_t stat); + static int dib7000p_read_status(struct dvb_frontend *fe, fe_status_t * stat) { struct dib7000p_state *state = fe->demodulator_priv; @@ -1564,6 +1578,8 @@ static int dib7000p_read_status(struct dvb_frontend *fe, fe_status_t * stat) if ((lock & 0x0038) == 0x38) *stat |= FE_HAS_LOCK; + dib7000p_get_stats(fe, *stat); + return 0; } @@ -1589,7 +1605,7 @@ static int dib7000p_read_signal_strength(struct dvb_frontend *fe, u16 * strength return 0; } -static int dib7000p_read_snr(struct dvb_frontend *fe, u16 * snr) +static u32 dib7000p_get_snr(struct dvb_frontend *fe) { struct dib7000p_state *state = fe->demodulator_priv; u16 val; @@ -1619,10 +1635,311 @@ static int dib7000p_read_snr(struct dvb_frontend *fe, u16 * snr) else result -= intlog10(2) * 10 * noise_exp - 100; + return result; +} + +static int dib7000p_read_snr(struct dvb_frontend *fe, u16 *snr) +{ + u32 result; + + result = dib7000p_get_snr(fe); + *snr = result / ((1 << 24) / 10); return 0; } +static void dib7000p_reset_stats(struct dvb_frontend *demod) +{ + struct dib7000p_state *state = demod->demodulator_priv; + struct dtv_frontend_properties *c = &demod->dtv_property_cache; + u32 ucb; + + memset(&c->strength, 0, sizeof(c->strength)); + memset(&c->cnr, 0, sizeof(c->cnr)); + memset(&c->post_bit_error, 0, sizeof(c->post_bit_error)); + memset(&c->post_bit_count, 0, sizeof(c->post_bit_count)); + memset(&c->block_error, 0, sizeof(c->block_error)); + + c->strength.len = 1; + c->cnr.len = 1; + c->block_error.len = 1; + c->block_count.len = 1; + c->post_bit_error.len = 1; + c->post_bit_count.len = 1; + + c->strength.stat[0].scale = FE_SCALE_DECIBEL; + c->strength.stat[0].uvalue = 0; + + c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + + dib7000p_read_unc_blocks(demod, &ucb); + + state->old_ucb = ucb; + state->ber_jiffies_stats = 0; + state->per_jiffies_stats = 0; +} + +struct linear_segments { + unsigned x; + signed y; +}; + +/* + * Table to estimate signal strength in dBm. + * This table should be empirically determinated by measuring the signal + * strength generated by a RF generator directly connected into + * a device. + */ +/* FIXME: Calibrate the table */ + +#define DB_OFFSET 0 + +static struct linear_segments strength_to_db_table[] = { + { 65535, 65535}, + { 0, 0}, +}; + +static u32 interpolate_value(u32 value, struct linear_segments *segments, + unsigned len) +{ + u64 tmp64; + u32 dx; + s32 dy; + int i, ret; + + if (value >= segments[0].x) + return segments[0].y; + if (value < segments[len-1].x) + return segments[len-1].y; + + for (i = 1; i < len - 1; i++) { + /* If value is identical, no need to interpolate */ + if (value == segments[i].x) + return segments[i].y; + if (value > segments[i].x) + break; + } + + /* Linear interpolation between the two (x,y) points */ + dy = segments[i - 1].y - segments[i].y; + dx = segments[i - 1].x - segments[i].x; + + tmp64 = value - segments[i].x; + tmp64 *= dy; + do_div(tmp64, dx); + ret = segments[i].y + tmp64; + + return ret; +} + +/* FIXME: may require changes - this one was borrowed from dib8000 */ +static u32 dib7000p_get_time_us(struct dvb_frontend *demod, int layer) +{ + struct dtv_frontend_properties *c = &demod->dtv_property_cache; + u64 time_us, tmp64; + u32 tmp, denom; + int guard, rate_num, rate_denum = 1, bits_per_symbol; + int interleaving = 0, fft_div; + + switch (c->guard_interval) { + case GUARD_INTERVAL_1_4: + guard = 4; + break; + case GUARD_INTERVAL_1_8: + guard = 8; + break; + case GUARD_INTERVAL_1_16: + guard = 16; + break; + default: + case GUARD_INTERVAL_1_32: + guard = 32; + break; + } + + switch (c->transmission_mode) { + case TRANSMISSION_MODE_2K: + fft_div = 4; + break; + case TRANSMISSION_MODE_4K: + fft_div = 2; + break; + default: + case TRANSMISSION_MODE_8K: + fft_div = 1; + break; + } + + switch (c->modulation) { + case DQPSK: + case QPSK: + bits_per_symbol = 2; + break; + case QAM_16: + bits_per_symbol = 4; + break; + default: + case QAM_64: + bits_per_symbol = 6; + break; + } + + switch ((c->hierarchy == 0 || 1 == 1) ? c->code_rate_HP : c->code_rate_LP) { + case FEC_1_2: + rate_num = 1; + rate_denum = 2; + break; + case FEC_2_3: + rate_num = 2; + rate_denum = 3; + break; + case FEC_3_4: + rate_num = 3; + rate_denum = 4; + break; + case FEC_5_6: + rate_num = 5; + rate_denum = 6; + break; + default: + case FEC_7_8: + rate_num = 7; + rate_denum = 8; + break; + } + + interleaving = interleaving; + + denom = bits_per_symbol * rate_num * fft_div * 384; + + /* If calculus gets wrong, wait for 1s for the next stats */ + if (!denom) + return 0; + + /* Estimate the period for the total bit rate */ + time_us = rate_denum * (1008 * 1562500L); + tmp64 = time_us; + do_div(tmp64, guard); + time_us = time_us + tmp64; + time_us += denom / 2; + do_div(time_us, denom); + + tmp = 1008 * 96 * interleaving; + time_us += tmp + tmp / guard; + + return time_us; +} + +static int dib7000p_get_stats(struct dvb_frontend *demod, fe_status_t stat) +{ + struct dib7000p_state *state = demod->demodulator_priv; + struct dtv_frontend_properties *c = &demod->dtv_property_cache; + int i; + int show_per_stats = 0; + u32 time_us = 0, val, snr; + u64 blocks, ucb; + s32 db; + u16 strength; + + /* Get Signal strength */ + dib7000p_read_signal_strength(demod, &strength); + val = strength; + db = interpolate_value(val, + strength_to_db_table, + ARRAY_SIZE(strength_to_db_table)) - DB_OFFSET; + c->strength.stat[0].svalue = db; + + /* FIXME: Remove this when calibrated to DB */ + c->strength.stat[0].scale = FE_SCALE_COUNTER; + + /* UCB/BER/CNR measures require lock */ + if (!(stat & FE_HAS_LOCK)) { + c->cnr.len = 1; + c->block_count.len = 1; + c->block_error.len = 1; + c->post_bit_error.len = 1; + c->post_bit_count.len = 1; + c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE; + return 0; + } + + /* Check if time for stats was elapsed */ + if (time_after(jiffies, state->per_jiffies_stats)) { + state->per_jiffies_stats = jiffies + msecs_to_jiffies(1000); + + /* Get SNR */ + snr = dib7000p_get_snr(demod); + if (snr) + snr = (1000L * snr) >> 24; + else + snr = 0; + c->cnr.stat[0].svalue = snr; + c->cnr.stat[0].scale = FE_SCALE_DECIBEL; + + /* Get UCB measures */ + dib7000p_read_unc_blocks(demod, &val); + ucb = val - state->old_ucb; + if (val < state->old_ucb) + ucb += 0x100000000LL; + + c->block_error.stat[0].scale = FE_SCALE_COUNTER; + c->block_error.stat[0].uvalue = ucb; + + /* Estimate the number of packets based on bitrate */ + if (!time_us) + time_us = dib7000p_get_time_us(demod, -1); + + if (time_us) { + blocks = 1250000ULL * 1000000ULL; + do_div(blocks, time_us * 8 * 204); + c->block_count.stat[0].scale = FE_SCALE_COUNTER; + c->block_count.stat[0].uvalue += blocks; + } + + show_per_stats = 1; + } + + /* Get post-BER measures */ + if (time_after(jiffies, state->ber_jiffies_stats)) { + time_us = dib7000p_get_time_us(demod, -1); + state->ber_jiffies_stats = jiffies + msecs_to_jiffies((time_us + 500) / 1000); + + dprintk("Next all layers stats available in %u us.", time_us); + + dib7000p_read_ber(demod, &val); + c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER; + c->post_bit_error.stat[0].uvalue += val; + + c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER; + c->post_bit_count.stat[0].uvalue += 100000000; + } + + /* Get PER measures */ + if (show_per_stats) { + dib7000p_read_unc_blocks(demod, &val); + + c->block_error.stat[0].scale = FE_SCALE_COUNTER; + c->block_error.stat[0].uvalue += val; + + time_us = dib7000p_get_time_us(demod, i); + if (time_us) { + blocks = 1250000ULL * 1000000ULL; + do_div(blocks, time_us * 8 * 204); + c->block_count.stat[0].scale = FE_SCALE_COUNTER; + c->block_count.stat[0].uvalue += blocks; + } + } + return 0; +} + static int dib7000p_fe_get_tune_settings(struct dvb_frontend *fe, struct dvb_frontend_tune_settings *tune) { tune->min_delay_ms = 1000; @@ -2408,6 +2725,8 @@ static struct dvb_frontend *dib7000p_init(struct i2c_adapter *i2c_adap, u8 i2c_a dib7000p_demod_reset(st); + dib7000p_reset_stats(demod); + if (st->version == SOC7090) { dib7090_set_output_mode(demod, st->cfg.output_mode); dib7090_set_diversity_in(demod, 0); |
