mirror of https://gitee.com/openkylin/linux.git
[media] dvb-frontend: split set_delivery_system()
This function is complex, and has different workflows, one for DVBv3 calls, and another one for DVBv5 calls. Break it into 3 functions, in order to make easier to understand what each block does. No functional changes so far. A few comments got improved. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
7f6301d125
commit
be431b16c6
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@ -1509,132 +1509,12 @@ static bool is_dvbv3_delsys(u32 delsys)
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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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static int emulate_delivery_system(struct dvb_frontend *fe,
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enum dvbv3_emulation_type type,
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u32 delsys, 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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int i;
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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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/*
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* It was reported that some old DVBv5 applications were
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* filling delivery_system with SYS_UNDEFINED. If this happens,
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* assume that the application wants to use the first supported
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* delivery system.
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*/
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if (c->delivery_system == SYS_UNDEFINED)
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c->delivery_system = fe->ops.delsys[0];
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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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* Also, DVBv3 applications don't know that ops.info->type
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* could be changed, and they simply dies when it doesn't
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* match.
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* So, don't change the current delivery system, as it
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* may be trying to do the wrong thing, like setting an
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* ISDB-T frontend as DVB-T. Instead, find the closest
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* DVBv3 system that matches the delivery system.
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*/
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if (is_dvbv3_delsys(c->delivery_system)) {
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dev_dbg(fe->dvb->device,
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"%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 = SYS_DVBS;
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break;
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case DVBV3_QAM:
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desired_system = SYS_DVBC_ANNEX_A;
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break;
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case DVBV3_ATSC:
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desired_system = SYS_ATSC;
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break;
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case DVBV3_OFDM:
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desired_system = SYS_DVBT;
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break;
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default:
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dev_dbg(fe->dvb->device, "%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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/*
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* Get a delivery system that is compatible with DVBv3
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* NOTE: in order for this to work with softwares like Kaffeine that
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* uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
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* DVB-S, drivers that support both should put the SYS_DVBS entry
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* before the SYS_DVBS2, otherwise it won't switch back to DVB-S.
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* The real fix is that userspace applications should not use DVBv3
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* and not trust on calling FE_SET_FRONTEND to switch the delivery
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* 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 (fe->ops.delsys[ncaps] == desired_system) {
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delsys = desired_system;
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break;
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}
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ncaps++;
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}
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if (delsys == SYS_UNDEFINED) {
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dev_dbg(fe->dvb->device, "%s: Couldn't find a delivery system that matches %d\n",
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__func__, desired_system);
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}
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} else {
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/*
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* This is a DVBv5 call. So, it likely knows the supported
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* delivery systems.
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*/
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/* Check if the desired delivery system is supported */
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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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dev_dbg(fe->dvb->device,
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"%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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ncaps++;
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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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dev_dbg(fe->dvb->device,
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"%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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dev_dbg(fe->dvb->device,
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"%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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}
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c->delivery_system = delsys;
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@ -1648,8 +1528,8 @@ static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system)
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* delivery system is the last one at the ops.delsys[] array
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*/
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dev_dbg(fe->dvb->device,
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"%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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"%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, handles ISDB-T calls. More code may be needed here for the
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@ -1684,6 +1564,162 @@ static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system)
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return 0;
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}
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static int dvbv5_set_delivery_system(struct dvb_frontend *fe,
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u32 desired_system)
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{
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int ncaps;
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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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/*
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* It was reported that some old DVBv5 applications were
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* filling delivery_system with SYS_UNDEFINED. If this happens,
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* assume that the application wants to use the first supported
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* delivery system.
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*/
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if (c->delivery_system == SYS_UNDEFINED)
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c->delivery_system = fe->ops.delsys[0];
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/*
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* This is a DVBv5 call. So, it likely knows the supported
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* delivery systems.
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*/
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/* Check if the desired delivery system is supported */
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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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dev_dbg(fe->dvb->device,
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"%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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ncaps++;
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}
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/*
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* Need to emulate a delivery system
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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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dev_dbg(fe->dvb->device,
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"%s: can't use a 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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/*
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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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dev_dbg(fe->dvb->device,
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"%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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return emulate_delivery_system(fe, type, delsys, desired_system);
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}
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static int dvbv3_set_delivery_system(struct dvb_frontend *fe)
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{
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int ncaps;
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u32 desired_system;
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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 not set yet, defaults to the first supported delivery system */
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if (c->delivery_system == SYS_UNDEFINED)
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c->delivery_system = fe->ops.delsys[0];
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/*
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* A DVBv3 call doesn't know what's the desired system.
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* Also, DVBv3 applications don't know that ops.info->type
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* could be changed, and they simply don't tune when it doesn't
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* match.
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* So, don't change the current delivery system, as it
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* may be trying to do the wrong thing, like setting an
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* ISDB-T frontend as DVB-T. Instead, find the closest
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* DVBv3 system that matches the delivery system.
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*/
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/*
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* Trivial case: just use the current one, if it already a DVBv3
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* delivery system
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*/
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if (is_dvbv3_delsys(c->delivery_system)) {
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dev_dbg(fe->dvb->device,
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"%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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/* Convert from DVBv3 into DVBv5 namespace */
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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 = SYS_DVBS;
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break;
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case DVBV3_QAM:
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desired_system = SYS_DVBC_ANNEX_A;
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break;
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case DVBV3_ATSC:
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desired_system = SYS_ATSC;
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break;
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case DVBV3_OFDM:
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desired_system = SYS_DVBT;
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break;
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default:
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dev_dbg(fe->dvb->device, "%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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/*
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* Get a delivery system that is compatible with DVBv3
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* NOTE: in order for this to work with softwares like Kaffeine that
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* uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to
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* DVB-S, drivers that support both should put the SYS_DVBS entry
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* before the SYS_DVBS2, otherwise it won't switch back to DVB-S.
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* The real fix is that userspace applications should not use DVBv3
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* and not trust on calling FE_SET_FRONTEND to switch the delivery
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* 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 (fe->ops.delsys[ncaps] == desired_system) {
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delsys = desired_system;
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break;
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}
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ncaps++;
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}
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if (delsys == SYS_UNDEFINED) {
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dev_dbg(fe->dvb->device, "%s: Couldn't find a delivery system that matches %d\n",
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__func__, desired_system);
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}
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return emulate_delivery_system(fe, type, delsys, desired_system);
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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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@ -1742,7 +1778,7 @@ 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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r = set_delivery_system(fe, tvp->u.data);
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r = dvbv5_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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@ -2335,7 +2371,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
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break;
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case FE_SET_FRONTEND:
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err = set_delivery_system(fe, SYS_UNDEFINED);
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err = dvbv3_set_delivery_system(fe);
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if (err)
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break;
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@ -2594,7 +2630,7 @@ int dvb_register_frontend(struct dvb_adapter* dvb,
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* first supported delivery system (ops->delsys[0])
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*/
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fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
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fe->dtv_property_cache.delivery_system = fe->ops.delsys[0];
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dvb_frontend_clear_cache(fe);
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mutex_unlock(&frontend_mutex);
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