Commit be431b16 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

[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: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 7f6301d1

drivers/media/dvb-core/dvb_frontend.c

+165 −129
Original line number Diff line number Diff line
@@ -1509,81 +1509,78 @@ static bool is_dvbv3_delsys(u32 delsys) 
	return status;

}



static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system)

static int emulate_delivery_system(struct dvb_frontend *fe,

				   enum dvbv3_emulation_type type,

				   u32 delsys, u32 desired_system)

{

	int ncaps, i;

	u32 delsys = SYS_UNDEFINED;

	int i;

	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	enum dvbv3_emulation_type type;



	c->delivery_system = delsys;



	/*

	 * It was reported that some old DVBv5 applications were

	 * filling delivery_system with SYS_UNDEFINED. If this happens,

	 * assume that the application wants to use the first supported

	 * delivery system.

	 * The DVBv3 or DVBv5 call is requesting a different system. So,

	 * emulation is needed.

	 *

	 * Emulate newer delivery systems like ISDBT, DVBT and DTMB

	 * 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

	 */

	if (c->delivery_system == SYS_UNDEFINED)

	        c->delivery_system = fe->ops.delsys[0];

	dev_dbg(fe->dvb->device,

		"%s: Using delivery system %d emulated as if it were a %d\n",

		__func__, delsys, desired_system);



	if (desired_system == SYS_UNDEFINED) {

	/*

		 * A DVBv3 call doesn't know what's the desired system.

		 * Also, DVBv3 applications don't know that ops.info->type

		 * could be changed, and they simply dies when it doesn't

		 * match.

		 * So, don't change the current delivery system, as it

		 * may be trying to do the wrong thing, like setting an

		 * ISDB-T frontend as DVB-T. Instead, find the closest

		 * DVBv3 system that matches the delivery system.

	 * For now, handles ISDB-T calls. More code may be needed here for the

	 * other emulated stuff

	 */

		if (is_dvbv3_delsys(c->delivery_system)) {

	if (type == DVBV3_OFDM) {

		if (c->delivery_system == SYS_ISDBT) {

			dev_dbg(fe->dvb->device,

					"%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 = SYS_DVBS;

			break;

		case DVBV3_QAM:

			desired_system = SYS_DVBC_ANNEX_A;

			break;

		case DVBV3_ATSC:

			desired_system = SYS_ATSC;

			break;

		case DVBV3_OFDM:

			desired_system = SYS_DVBT;

			break;

		default:

			dev_dbg(fe->dvb->device, "%s: This frontend doesn't support DVBv3 calls\n",

					"%s: Using defaults for SYS_ISDBT\n",

					__func__);

			return -EINVAL;



			if (!c->bandwidth_hz)

				c->bandwidth_hz = 6000000;



			c->isdbt_partial_reception = 0;

			c->isdbt_sb_mode = 0;

			c->isdbt_sb_subchannel = 0;

			c->isdbt_sb_segment_idx = 0;

			c->isdbt_sb_segment_count = 0;

			c->isdbt_layer_enabled = 0;

			for (i = 0; i < 3; i++) {

				c->layer[i].fec = FEC_AUTO;

				c->layer[i].modulation = QAM_AUTO;

				c->layer[i].interleaving = 0;

				c->layer[i].segment_count = 0;

			}

		/*

		 * Get a delivery system that is compatible with DVBv3

		 * NOTE: in order for this to work with softwares like Kaffeine that

		 *	uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to

		 *	DVB-S, drivers that support both should put the SYS_DVBS entry

		 *	before the SYS_DVBS2, otherwise it won't switch back to DVB-S.

		 *	The real fix is that userspace applications should not use DVBv3

		 *	and not trust on calling FE_SET_FRONTEND to switch the delivery

		 *	system.

		 */

		ncaps = 0;

		while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) {

			if (fe->ops.delsys[ncaps] == desired_system) {

				delsys = desired_system;

				break;

		}

			ncaps++;

	}

		if (delsys == SYS_UNDEFINED) {

			dev_dbg(fe->dvb->device, "%s: Couldn't find a delivery system that matches %d\n",

					__func__, desired_system);

	dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",

			__func__, c->delivery_system);



	return 0;

}

	} else {



static int dvbv5_set_delivery_system(struct dvb_frontend *fe,

				     u32 desired_system)

{

	int ncaps;

	u32 delsys = SYS_UNDEFINED;

	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	enum dvbv3_emulation_type type;



	/*

	 * It was reported that some old DVBv5 applications were

	 * filling delivery_system with SYS_UNDEFINED. If this happens,

	 * assume that the application wants to use the first supported

	 * delivery system.

	 */

	if (c->delivery_system == SYS_UNDEFINED)

		c->delivery_system = fe->ops.delsys[0];



	/*

	* This is a DVBv5 call. So, it likely knows the supported

	* delivery systems.
@@ -1601,6 +1598,11 @@ static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system) 
		}

		ncaps++;

	}



	/*

	 * Need to emulate a delivery system

	 */



	type = dvbv3_type(desired_system);



	/*
@@ -1611,7 +1613,7 @@ static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system) 
	*/

	if (!is_dvbv3_delsys(desired_system)) {

		dev_dbg(fe->dvb->device,

					"%s: can't use a DVBv3 FE_SET_FRONTEND call on this frontend\n",

			"%s: can't use a DVBv3 FE_SET_FRONTEND call for this frontend\n",

			__func__);

		return -EINVAL;

	}
@@ -1634,54 +1636,88 @@ static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system) 
				__func__);

		return -EINVAL;

	}



	return emulate_delivery_system(fe, type, delsys, desired_system);

}



	c->delivery_system = delsys;

static int dvbv3_set_delivery_system(struct dvb_frontend *fe)

{

	int ncaps;

	u32 desired_system;

	u32 delsys = SYS_UNDEFINED;

	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	enum dvbv3_emulation_type type;



	/* If not set yet, defaults to the first supported delivery system */

	if (c->delivery_system == SYS_UNDEFINED)

		c->delivery_system = fe->ops.delsys[0];



	/*

	 * The DVBv3 or DVBv5 call is requesting a different system. So,

	 * emulation is needed.

	 *

	 * Emulate newer delivery systems like ISDBT, DVBT and DTMB

	 * 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

	 * A DVBv3 call doesn't know what's the desired system.

	 * Also, DVBv3 applications don't know that ops.info->type

	 * could be changed, and they simply don't tune when it doesn't

	 * match.

	 * So, don't change the current delivery system, as it

	 * may be trying to do the wrong thing, like setting an

	 * ISDB-T frontend as DVB-T. Instead, find the closest

	 * DVBv3 system that matches the delivery system.

	 */

	dev_dbg(fe->dvb->device,

			"%s: Using delivery system %d emulated as if it were a %d\n",

			__func__, delsys, desired_system);



	/*

	 * For now, handles ISDB-T calls. More code may be needed here for the

	 * other emulated stuff

	 * Trivial case: just use the current one, if it already a DVBv3

	 * delivery system

	 */

	if (type == DVBV3_OFDM) {

		if (c->delivery_system == SYS_ISDBT) {

	if (is_dvbv3_delsys(c->delivery_system)) {

		dev_dbg(fe->dvb->device,

					"%s: Using defaults for SYS_ISDBT\n",

					__func__);

				"%s: Using delivery system to %d\n",

				__func__, c->delivery_system);

		return 0;

	}



			if (!c->bandwidth_hz)

				c->bandwidth_hz = 6000000;

	/* Convert from DVBv3 into DVBv5 namespace */

	type = dvbv3_type(c->delivery_system);

	switch (type) {

	case DVBV3_QPSK:

		desired_system = SYS_DVBS;

		break;

	case DVBV3_QAM:

		desired_system = SYS_DVBC_ANNEX_A;

		break;

	case DVBV3_ATSC:

		desired_system = SYS_ATSC;

		break;

	case DVBV3_OFDM:

		desired_system = SYS_DVBT;

		break;

	default:

		dev_dbg(fe->dvb->device, "%s: This frontend doesn't support DVBv3 calls\n",

				__func__);

		return -EINVAL;

	}



			c->isdbt_partial_reception = 0;

			c->isdbt_sb_mode = 0;

			c->isdbt_sb_subchannel = 0;

			c->isdbt_sb_segment_idx = 0;

			c->isdbt_sb_segment_count = 0;

			c->isdbt_layer_enabled = 0;

			for (i = 0; i < 3; i++) {

				c->layer[i].fec = FEC_AUTO;

				c->layer[i].modulation = QAM_AUTO;

				c->layer[i].interleaving = 0;

				c->layer[i].segment_count = 0;

	/*

	 * Get a delivery system that is compatible with DVBv3

	 * NOTE: in order for this to work with softwares like Kaffeine that

	 *	uses a DVBv5 call for DVB-S2 and a DVBv3 call to go back to

	 *	DVB-S, drivers that support both should put the SYS_DVBS entry

	 *	before the SYS_DVBS2, otherwise it won't switch back to DVB-S.

	 *	The real fix is that userspace applications should not use DVBv3

	 *	and not trust on calling FE_SET_FRONTEND to switch the delivery

	 *	system.

	 */

	ncaps = 0;

	while (fe->ops.delsys[ncaps] && ncaps < MAX_DELSYS) {

		if (fe->ops.delsys[ncaps] == desired_system) {

			delsys = desired_system;

			break;

		}

		ncaps++;

	}

	if (delsys == SYS_UNDEFINED) {

		dev_dbg(fe->dvb->device, "%s: Couldn't find a delivery system that matches %d\n",

			__func__, desired_system);

	}

	dev_dbg(fe->dvb->device, "%s: change delivery system on cache to %d\n",

			__func__, c->delivery_system);



	return 0;

	return emulate_delivery_system(fe, type, delsys, desired_system);

}



static int dtv_property_process_set(struct dvb_frontend *fe,
@@ -1742,7 +1778,7 @@ static int dtv_property_process_set(struct dvb_frontend *fe, 
		c->rolloff = tvp->u.data;

		break;

	case DTV_DELIVERY_SYSTEM:

		r = set_delivery_system(fe, tvp->u.data);

		r = dvbv5_set_delivery_system(fe, tvp->u.data);

		break;

	case DTV_VOLTAGE:

		c->voltage = tvp->u.data;
@@ -2335,7 +2371,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file, 
		break;



	case FE_SET_FRONTEND:

		err = set_delivery_system(fe, SYS_UNDEFINED);

		err = dvbv3_set_delivery_system(fe);

		if (err)

			break;

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