[PATCH 2/4] dvb_frontend: add routine for DVB-T2 parameter validation

[Antti Palosaari <crope@xxxxxx>]

Common routine for use of dvb-core, demodulator and tuner for check
given DVB-T2 parameters correctness.

Signed-off-by: Antti Palosaari <crope@xxxxxx>
---
 drivers/media/dvb-core/dvb_frontend.c | 118 ++++++++++++++++++++++++++++++++++
 drivers/media/dvb-core/dvb_frontend.h |   1 +
 2 files changed, 119 insertions(+)

diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index 4abb648..6413c74 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -2641,6 +2641,124 @@ int dvb_validate_params_dvbt(struct dvb_frontend *fe)
 }
 EXPORT_SYMBOL(dvb_validate_params_dvbt);
 
+int dvb_validate_params_dvbt2(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+	dev_dbg(fe->dvb->device, "%s:\n", __func__);
+
+	switch (c->delivery_system) {
+	case SYS_DVBT2:
+		break;
+	default:
+		dev_dbg(fe->dvb->device, "%s: delivery_system=%d\n", __func__,
+				c->delivery_system);
+		return -EINVAL;
+	}
+
+	/*
+	 * DVB-T2 specification as such does not specify any frequency bands.
+	 * Define real life limits still. L-Band 1452 - 1492 MHz may exits in
+	 * future too.
+	 */
+	if (c->frequency >= 174000000 && c->frequency <= 230000000) {
+		;
+	} else if (c->frequency >= 470000000 && c->frequency <= 862000000) {
+		;
+	} else {
+		dev_dbg(fe->dvb->device, "%s: frequency=%d\n", __func__,
+				c->frequency);
+		return -EINVAL;
+	}
+
+	switch (c->bandwidth_hz) {
+	case  6000000:
+	case  7000000:
+	case  8000000:
+	case  1700000:
+	case  5000000:
+	case 10000000:
+		break;
+	default:
+		dev_dbg(fe->dvb->device, "%s: bandwidth_hz=%d\n", __func__,
+				c->bandwidth_hz);
+		return -EINVAL;
+	}
+
+	/*
+	 * Valid Physical Layer Pipe (PLP) values are 0 - 255
+	 */
+	if (c->dvbt2_plp_id <= 255) {
+		;
+	} else {
+		dev_dbg(fe->dvb->device, "%s: dvbt2_plp_id=%d\n", __func__,
+				c->dvbt2_plp_id);
+		return -EINVAL;
+	}
+
+	switch (c->transmission_mode) {
+	case TRANSMISSION_MODE_AUTO:
+	case TRANSMISSION_MODE_2K:
+	case TRANSMISSION_MODE_8K:
+	case TRANSMISSION_MODE_1K:
+	case TRANSMISSION_MODE_4K:
+	case TRANSMISSION_MODE_16K:
+	case TRANSMISSION_MODE_32K:
+		break;
+	default:
+		dev_dbg(fe->dvb->device, "%s: transmission_mode=%d\n", __func__,
+				c->transmission_mode);
+		return -EINVAL;
+	}
+
+	switch (c->modulation) {
+	case QAM_AUTO:
+	case QPSK:
+	case QAM_16:
+	case QAM_64:
+	case QAM_256:
+		break;
+	default:
+		dev_dbg(fe->dvb->device, "%s: modulation=%d\n", __func__,
+				c->modulation);
+		return -EINVAL;
+	}
+
+	switch (c->guard_interval) {
+	case GUARD_INTERVAL_AUTO:
+	case GUARD_INTERVAL_1_32:
+	case GUARD_INTERVAL_1_16:
+	case GUARD_INTERVAL_1_8:
+	case GUARD_INTERVAL_1_4:
+	case GUARD_INTERVAL_1_128:
+	case GUARD_INTERVAL_19_128:
+	case GUARD_INTERVAL_19_256:
+		break;
+	default:
+		dev_dbg(fe->dvb->device, "%s: guard_interval=%d\n", __func__,
+				c->guard_interval);
+		return -EINVAL;
+	}
+
+	switch (c->fec_inner) {
+	case FEC_AUTO:
+	case FEC_1_2:
+	case FEC_3_5:
+	case FEC_2_3:
+	case FEC_3_4:
+	case FEC_4_5:
+	case FEC_5_6:
+		break;
+	default:
+		dev_dbg(fe->dvb->device, "%s: fec_inner=%d\n", __func__,
+				c->fec_inner);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(dvb_validate_params_dvbt2);
+
 int dvb_register_frontend(struct dvb_adapter* dvb,
 			  struct dvb_frontend* fe)
 {
diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h
index 6df0c44..bcd572d 100644
--- a/drivers/media/dvb-core/dvb_frontend.h
+++ b/drivers/media/dvb-core/dvb_frontend.h
@@ -426,5 +426,6 @@ extern void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec);
 extern s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime);
 
 extern int dvb_validate_params_dvbt(struct dvb_frontend *fe);
+extern int dvb_validate_params_dvbt2(struct dvb_frontend *fe);
 
 #endif
-- 
1.7.11.2

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