diff options
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/dvb/frontends/mb86a20s.c | 196 |
1 files changed, 193 insertions, 3 deletions
diff --git a/drivers/media/dvb/frontends/mb86a20s.c b/drivers/media/dvb/frontends/mb86a20s.c index 82d3301a1c1..38778a87702 100644 --- a/drivers/media/dvb/frontends/mb86a20s.c +++ b/drivers/media/dvb/frontends/mb86a20s.c @@ -525,16 +525,206 @@ static int mb86a20s_set_frontend(struct dvb_frontend *fe) return rc; } +static int mb86a20s_get_modulation(struct mb86a20s_state *state, + unsigned layer) +{ + int rc; + static unsigned char reg[] = { + [0] = 0x86, /* Layer A */ + [1] = 0x8a, /* Layer B */ + [2] = 0x8e, /* Layer C */ + }; + + if (layer > ARRAY_SIZE(reg)) + return -EINVAL; + rc = mb86a20s_writereg(state, 0x6d, reg[layer]); + if (rc < 0) + return rc; + rc = mb86a20s_readreg(state, 0x6e); + if (rc < 0) + return rc; + switch ((rc & 0x70) >> 4) { + case 0: + return DQPSK; + case 1: + return QPSK; + case 2: + return QAM_16; + case 3: + return QAM_64; + default: + return QAM_AUTO; + } +} + +static int mb86a20s_get_fec(struct mb86a20s_state *state, + unsigned layer) +{ + int rc; + + static unsigned char reg[] = { + [0] = 0x87, /* Layer A */ + [1] = 0x8b, /* Layer B */ + [2] = 0x8f, /* Layer C */ + }; + + if (layer > ARRAY_SIZE(reg)) + return -EINVAL; + rc = mb86a20s_writereg(state, 0x6d, reg[layer]); + if (rc < 0) + return rc; + rc = mb86a20s_readreg(state, 0x6e); + if (rc < 0) + return rc; + switch (rc) { + case 0: + return FEC_1_2; + case 1: + return FEC_2_3; + case 2: + return FEC_3_4; + case 3: + return FEC_5_6; + case 4: + return FEC_7_8; + default: + return FEC_AUTO; + } +} + +static int mb86a20s_get_interleaving(struct mb86a20s_state *state, + unsigned layer) +{ + int rc; + + static unsigned char reg[] = { + [0] = 0x88, /* Layer A */ + [1] = 0x8c, /* Layer B */ + [2] = 0x90, /* Layer C */ + }; + + if (layer > ARRAY_SIZE(reg)) + return -EINVAL; + rc = mb86a20s_writereg(state, 0x6d, reg[layer]); + if (rc < 0) + return rc; + rc = mb86a20s_readreg(state, 0x6e); + if (rc < 0) + return rc; + if (rc > 3) + return -EINVAL; /* Not used */ + return rc; +} + +static int mb86a20s_get_segment_count(struct mb86a20s_state *state, + unsigned layer) +{ + int rc, count; + + static unsigned char reg[] = { + [0] = 0x89, /* Layer A */ + [1] = 0x8d, /* Layer B */ + [2] = 0x91, /* Layer C */ + }; + + if (layer > ARRAY_SIZE(reg)) + return -EINVAL; + rc = mb86a20s_writereg(state, 0x6d, reg[layer]); + if (rc < 0) + return rc; + rc = mb86a20s_readreg(state, 0x6e); + if (rc < 0) + return rc; + count = (rc >> 4) & 0x0f; + + return count; +} + static int mb86a20s_get_frontend(struct dvb_frontend *fe) { + struct mb86a20s_state *state = fe->demodulator_priv; struct dtv_frontend_properties *p = &fe->dtv_property_cache; + int i, rc; - /* FIXME: For now, it does nothing */ - + /* Fixed parameters */ + p->delivery_system = SYS_ISDBT; p->bandwidth_hz = 6000000; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + /* Check for partial reception */ + rc = mb86a20s_writereg(state, 0x6d, 0x85); + if (rc >= 0) + rc = mb86a20s_readreg(state, 0x6e); + if (rc >= 0) + p->isdbt_partial_reception = (rc & 0x10) ? 1 : 0; + + /* Get per-layer data */ + p->isdbt_layer_enabled = 0; + for (i = 0; i < 3; i++) { + rc = mb86a20s_get_segment_count(state, i); + if (rc >= 0 && rc < 14) + p->layer[i].segment_count = rc; + if (rc == 0x0f) + continue; + p->isdbt_layer_enabled |= 1 << i; + rc = mb86a20s_get_modulation(state, i); + if (rc >= 0) + p->layer[i].modulation = rc; + rc = mb86a20s_get_fec(state, i); + if (rc >= 0) + p->layer[i].fec = rc; + rc = mb86a20s_get_interleaving(state, i); + if (rc >= 0) + p->layer[i].interleaving = rc; + } + + p->isdbt_sb_mode = 0; + rc = mb86a20s_writereg(state, 0x6d, 0x84); + if ((rc >= 0) && ((rc & 0x60) == 0x20)) { + p->isdbt_sb_mode = 1; + /* At least, one segment should exist */ + if (!p->isdbt_sb_segment_count) + p->isdbt_sb_segment_count = 1; + } else + p->isdbt_sb_segment_count = 0; + + /* Get transmission mode and guard interval */ p->transmission_mode = TRANSMISSION_MODE_AUTO; p->guard_interval = GUARD_INTERVAL_AUTO; - p->isdbt_partial_reception = 0; + rc = mb86a20s_readreg(state, 0x07); + if (rc >= 0) { + if ((rc & 0x60) == 0x20) { + switch (rc & 0x0c >> 2) { + case 0: + p->transmission_mode = TRANSMISSION_MODE_2K; + break; + case 1: + p->transmission_mode = TRANSMISSION_MODE_4K; + break; + case 2: + p->transmission_mode = TRANSMISSION_MODE_8K; + break; + } + } + if (!(rc & 0x10)) { + switch (rc & 0x3) { + case 0: + p->guard_interval = GUARD_INTERVAL_1_4; + break; + case 1: + p->guard_interval = GUARD_INTERVAL_1_8; + break; + case 2: + p->guard_interval = GUARD_INTERVAL_1_16; + break; + } + } + } + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); return 0; } |