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[media] tda10021: Add support for DVB-C Annex C 

While tda10021 supports both DVB-C Annex A and C, it is currently
hard-coded to Annex A. Add support for Annex C and re-work the
code in order to report the delivery systems, thans to Andreas,
that passed us the register settings for the Roll-off factor.

Thanks-to: Andreas Oberriter <obi@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2011-12-17 20:37:01 -03:00
parent 27d9a5e938
commit 1a5cd29631
1 changed files with 45 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
drivers/media/dvb/frontends/tda10021.c
View File

@ -231,6 +231,11 @@ struct qam_params {
static int tda10021_set_parameters (struct dvb_frontend *fe,
struct dvb_frontend_parameters *p)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
u32 delsys = c->delivery_system;
unsigned qam = c->modulation;
bool is_annex_c;
u32 reg0x3d;
struct tda10021_state* state = fe->demodulator_priv;
static const struct qam_params qam_params[] = {
/* Modulation Conf AGCref LTHR MSETH AREF */
@ -241,7 +246,17 @@ static int tda10021_set_parameters (struct dvb_frontend *fe,
[QAM_128] = { 0x0c, 0x78, 0x36, 0x34, 0x7e },
[QAM_256] = { 0x10, 0x5c, 0x26, 0x23, 0x6b },
};
int qam = p->u.qam.modulation;
switch (delsys) {
case SYS_DVBC_ANNEX_A:
is_annex_c = false;
break;
case SYS_DVBC_ANNEX_C:
is_annex_c = true;
break;
default:
return -EINVAL;
}
/*
* gcc optimizes the code bellow the same way as it would code:
@ -262,7 +277,7 @@ static int tda10021_set_parameters (struct dvb_frontend *fe,
return -EINVAL;
}
if (p->inversion != INVERSION_ON && p->inversion != INVERSION_OFF)
if (c->inversion != INVERSION_ON && c->inversion != INVERSION_OFF)
return -EINVAL;
//printk("tda10021: set frequency to %d qam=%d symrate=%d\n", p->frequency,qam,p->u.qam.symbol_rate);
@ -272,14 +287,24 @@ static int tda10021_set_parameters (struct dvb_frontend *fe,
if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
}
tda10021_set_symbolrate(state, p->u.qam.symbol_rate);
tda10021_set_symbolrate(state, c->symbol_rate);
_tda10021_writereg(state, 0x34, state->pwm);
_tda10021_writereg(state, 0x01, qam_params[qam].agcref);
_tda10021_writereg(state, 0x05, qam_params[qam].lthr);
_tda10021_writereg(state, 0x08, qam_params[qam].mseth);
_tda10021_writereg(state, 0x09, qam_params[qam].aref);
tda10021_setup_reg0(state, qam_params[qam].conf, p->inversion);
/*
* Bit 0 == 0 means roll-off = 0.15 (Annex A)
* == 1 means roll-off = 0.13 (Annex C)
*/
reg0x3d = tda10021_readreg (state, 0x3d);
if (is_annex_c)
_tda10021_writereg (state, 0x3d, 0x01 | reg0x3d);
else
_tda10021_writereg (state, 0x3d, 0xfe & reg0x3d);
tda10021_setup_reg0(state, qam_params[qam].conf, c->inversion);
return 0;
}
@ -458,6 +483,21 @@ error:
return NULL;
}
static int tda10021_get_property(struct dvb_frontend *fe,
struct dtv_property *p)
{
switch (p->cmd) {
case DTV_ENUM_DELSYS:
p->u.buffer.data[0] = SYS_DVBC_ANNEX_A;
p->u.buffer.data[1] = SYS_DVBC_ANNEX_C;
p->u.buffer.len = 2;
break;
default:
break;
}
return 0;
}
static struct dvb_frontend_ops tda10021_ops = {
.info = {
@ -486,6 +526,7 @@ static struct dvb_frontend_ops tda10021_ops = {
.set_frontend = tda10021_set_parameters,
.get_frontend = tda10021_get_frontend,
.get_property = tda10021_get_property,
.read_status = tda10021_read_status,
.read_ber = tda10021_read_ber,