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[media] mb86a20s: implement get_frontend()

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Reports the auto-detected parameters to userspace.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2012-01-09 18:16:36 -02:00
parent 90bf3aab42
commit 959a119f86
1 changed files with 193 additions and 3 deletions
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196
drivers/media/dvb/frontends/mb86a20s.c
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@ -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;
}