[media] dvb: the core logic to handle the DVBv5 QoS properties

Add the logic to poll, reset counters and report the QoS stats
to the end user.
The idea is that the core will periodically poll the frontend for
the stats. The frontend may return -EBUSY, if the previous collect
didn't finish, or it may fill the cached data.
The value returned to the end user is always the cached data.

Reviewed-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb-core/dvb_frontend.c

@@ -1053,6 +1053,16 @@ static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = {
 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0),
 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0),
 	_DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0),
+
+	/* Statistics API */
+	_DTV_CMD(DTV_STAT_SIGNAL_STRENGTH, 0, 0),
+	_DTV_CMD(DTV_STAT_CNR, 0, 0),
+	_DTV_CMD(DTV_STAT_PRE_ERROR_BIT_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_PRE_TOTAL_BIT_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_ERROR_BLOCK_COUNT, 0, 0),
+	_DTV_CMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0, 0),
 };
 
 static void dtv_property_dump(struct dvb_frontend *fe, struct dtv_property *tvp)
@@ -1443,6 +1453,31 @@ static int dtv_property_process_get(struct dvb_frontend *fe,
 		tvp->u.data = c->lna;
 		break;
 
+	/* Fill quality measures */
+	case DTV_STAT_SIGNAL_STRENGTH:
+		tvp->u.st = c->strength;
+		break;
+	case DTV_STAT_CNR:
+		tvp->u.st = c->cnr;
+		break;
+	case DTV_STAT_PRE_ERROR_BIT_COUNT:
+		tvp->u.st = c->pre_bit_error;
+		break;
+	case DTV_STAT_PRE_TOTAL_BIT_COUNT:
+		tvp->u.st = c->pre_bit_count;
+		break;
+	case DTV_STAT_POST_ERROR_BIT_COUNT:
+		tvp->u.st = c->post_bit_error;
+		break;
+	case DTV_STAT_POST_TOTAL_BIT_COUNT:
+		tvp->u.st = c->post_bit_count;
+		break;
+	case DTV_STAT_ERROR_BLOCK_COUNT:
+		tvp->u.st = c->block_error;
+		break;
+	case DTV_STAT_TOTAL_BLOCK_COUNT:
+		tvp->u.st = c->block_count;
+		break;
 	default:
 		return -EINVAL;
 	}

drivers/media/dvb-core/dvb_frontend.h

@@ -393,6 +393,16 @@ struct dtv_frontend_properties {
 	u8			atscmh_sccc_code_mode_d;
 
 	u32			lna;
+
+	/* statistics data */
+	struct dtv_fe_stats	strength;
+	struct dtv_fe_stats	cnr;
+	struct dtv_fe_stats	pre_bit_error;
+	struct dtv_fe_stats	pre_bit_count;
+	struct dtv_fe_stats	post_bit_error;
+	struct dtv_fe_stats	post_bit_count;
+	struct dtv_fe_stats	block_error;
+	struct dtv_fe_stats	block_count;
 };
 
 struct dvb_frontend {