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[media] dvb_frontend: Fix DVBv3 emulation

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For frontends with ISDB-T, DVB-T2, CMDBTH, etc, some code is
needed, in order to provide emulation. Add such code, and check
if the desired delivery system is supported by the frontend.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2012-01-01 16:11:14 -03:00
parent 5bfaaddef8
commit 04be0f76a8
1 changed files with 139 additions and 1 deletions
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140
drivers/media/dvb/dvb-core/dvb_frontend.c
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@ -1422,6 +1422,139 @@ static int dtv_property_process_get(struct dvb_frontend *fe,
static int dtv_set_frontend(struct dvb_frontend *fe);
static bool is_dvbv3_delsys(u32 delsys)
{
bool status;
status = (delsys == SYS_DVBT) || (delsys == SYS_DVBC_ANNEX_A) ||
(delsys == SYS_DVBS) || (delsys == SYS_ATSC);
return status;
}
static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system)
{
int ncaps, i;
u32 delsys = SYS_UNDEFINED;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
enum dvbv3_emulation_type type;
if (desired_system == SYS_UNDEFINED) {
/*
* A DVBv3 call doesn't know what's the desired system.
* So, don't change the current delivery system. Instead,
* find the closest DVBv3 system that matches the delivery
* system.
*/
if (is_dvbv3_delsys(c->delivery_system)) {
dprintk("%s() Using delivery system to %d\n",
__func__, c->delivery_system);
return 0;
}
type = dvbv3_type(c->delivery_system);
switch (type) {
case DVBV3_QPSK:
desired_system = FE_QPSK;
break;
case DVBV3_QAM:
desired_system = FE_QAM;
break;
case DVBV3_ATSC:
desired_system = FE_ATSC;
break;
case DVBV3_OFDM:
desired_system = FE_OFDM;
break;
default:
dprintk("%s(): This frontend doesn't support DVBv3 calls\n",
__func__);
return -EINVAL;
}
delsys = c->delivery_system;
} else {
/*
* Check if the desired delivery system is supported
*/
ncaps = 0;
while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) {
if (fe->ops.delsys[ncaps] == desired_system) {
c->delivery_system = desired_system;
dprintk("%s() Changing delivery system to %d\n",
__func__, desired_system);
return 0;
}
}
type = dvbv3_type(desired_system);
/*
* The delivery system is not supported. See if it can be
* emulated.
* The emulation only works if the desired system is one of the
* DVBv3 delivery systems
*/
if (!is_dvbv3_delsys(desired_system)) {
dprintk("%s() can't use a DVBv3 FE_SET_FRONTEND call on this frontend\n",
__func__);
return -EINVAL;
}
/*
* Get the last non-DVBv3 delivery system that has the same type
* of the desired system
*/
ncaps = 0;
while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) {
if ((dvbv3_type(fe->ops.delsys[ncaps]) == type) &&
!is_dvbv3_delsys(fe->ops.delsys[ncaps]))
delsys = fe->ops.delsys[ncaps];
ncaps++;
}
/* There's nothing compatible with the desired delivery system */
if (delsys == SYS_UNDEFINED) {
dprintk("%s() Incompatible DVBv3 FE_SET_FRONTEND call for this frontend\n",
__func__);
return -EINVAL;
}
c->delivery_system = delsys;
}
/*
* Emulate newer delivery systems like ISDBT, DVBT and DMBTH
* for older DVBv5 applications. The emulation will try to use
* the auto mode for most things, and will assume that the desired
* delivery system is the last one at the ops.delsys[] array
*/
dprintk("%s() Using delivery system %d emulated as if it were a %d\n",
__func__, delsys, desired_system);
/*
* For now, uses it for ISDB-T, DMBTH and DVB-T2
* For DVB-S2 and DVB-TURBO, assumes that the DVB-S parameters are enough.
*/
if (type == DVBV3_OFDM) {
c->modulation = QAM_AUTO;
c->code_rate_HP = FEC_AUTO;
c->code_rate_LP = FEC_AUTO;
c->transmission_mode = TRANSMISSION_MODE_AUTO;
c->guard_interval = GUARD_INTERVAL_AUTO;
c->hierarchy = HIERARCHY_AUTO;
c->isdbt_partial_reception = -1;
c->isdbt_sb_mode = -1;
c->isdbt_sb_subchannel = -1;
c->isdbt_sb_segment_idx = -1;
c->isdbt_sb_segment_count = -1;
c->isdbt_layer_enabled = 0x7;
for (i = 0; i < 3; i++) {
c->layer[i].fec = FEC_AUTO;
c->layer[i].modulation = QAM_AUTO;
c->layer[i].interleaving = -1;
c->layer[i].segment_count = -1;
}
}
return 0;
}
static int dtv_property_process_set(struct dvb_frontend *fe,
struct dtv_property *tvp,
struct file *file)
@ -1484,7 +1617,7 @@ static int dtv_property_process_set(struct dvb_frontend *fe,
c->rolloff = tvp->u.data;
break;
case DTV_DELIVERY_SYSTEM:
c->delivery_system = tvp->u.data;
r = set_delivery_system(fe, tvp->u.data);
break;
case DTV_VOLTAGE:
c->voltage = tvp->u.data;
@ -2043,6 +2176,11 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
/* Synchronise DVBv5 parameters from DVBv3 */
memcpy (&fepriv->parameters_in, parg,
sizeof (struct dvb_frontend_parameters));
err = set_delivery_system(fe, SYS_UNDEFINED);
if (err)
break;
err = dtv_property_cache_sync(fe, c, &fepriv->parameters_in);
if (err)
break;