Some demodulators (e.g. si2168) are able to scan for DVB-T and DVB-T2 signals concurrently. Use SYS_DVBT_AUTO for this purpose. --- This is a Request For Comments from media maintainers and users :-)
One issue: suppose DVB Project publishes DVB-T3 in a few years. Today's demods might handle T/T2, but they won't handle T3, while users may expect SYS_DVBT_AUTO to mean "all DVB-T standards". Therefore, perhaps the delsys name should be explicit, like SYS_DVBT_DVBT2 or SYS_DVBT_1_2. Then if/when DVB_T3 appears, we can add SYS_DVBT_1_2_3 ??? Or maybe use the FE_CAN_2G_MODULATION and hypothetical FE_CAN_3G_MODULATION Or maybe, with several standards having a v2 and possibly v3 in the future, delivery system might move to a bitmask approach? (API issues though) Reference to related implementation: https://patchwork.kernel.org/patch/10744999/ --- drivers/media/dvb-frontends/si2168.c | 2 +- include/uapi/linux/dvb/frontend.h | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/media/dvb-frontends/si2168.c b/drivers/media/dvb-frontends/si2168.c index 14b93a7d3358..8578b8917955 100644 --- a/drivers/media/dvb-frontends/si2168.c +++ b/drivers/media/dvb-frontends/si2168.c @@ -624,7 +624,7 @@ static int si2168_deselect(struct i2c_mux_core *muxc, u32 chan) } static const struct dvb_frontend_ops si2168_ops = { - .delsys = {SYS_DVBT, SYS_DVBT2, SYS_DVBC_ANNEX_A}, + .delsys = {SYS_DVBT, SYS_DVBT2, SYS_DVBT_AUTO, SYS_DVBC_ANNEX_A}, .info = { .name = "Silicon Labs Si2168", .frequency_min_hz = 48 * MHz, diff --git a/include/uapi/linux/dvb/frontend.h b/include/uapi/linux/dvb/frontend.h index 4f9b4551c534..3a6348748041 100644 --- a/include/uapi/linux/dvb/frontend.h +++ b/include/uapi/linux/dvb/frontend.h @@ -600,6 +600,8 @@ enum fe_rolloff { * Terrestrial TV: DVB-T * @SYS_DVBT2: * Terrestrial TV: DVB-T2 + * @SYS_DVBT_AUTO: + * Terrestrial TV: Autodetect DVB-T gen * @SYS_ISDBT: * Terrestrial TV: ISDB-T * @SYS_ATSC: @@ -645,6 +647,7 @@ enum fe_delivery_system { SYS_DVBT2, SYS_TURBO, SYS_DVBC_ANNEX_C, + SYS_DVBT_AUTO, }; /* backward compatibility definitions for delivery systems */ -- 2.17.1
