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