ASoC: macaudio: Gate off experimental platforms

We know at least some machines can have their speakers blown, even with
these limits, so let's play it safe for now and require that users both
enable stuff in the DT *and* pass this flag.

Signed-off-by: Hector Martin <marcan@marcan.st>

Author: marcan

sound/soc/apple/macaudio.c

@@ -727,6 +727,11 @@ static int macaudio_j314_fixup_controls(struct snd_soc_card *card)
 	struct macaudio_snd_data *ma = snd_soc_card_get_drvdata(card);
 
 	if (ma->has_speakers) {
+		if (!please_blow_up_my_speakers) {
+			dev_err(card->dev, "driver can't assure safety on this model, refusing probe\n");
+			return -EINVAL;
+		}
+
 		CHECK(snd_soc_set_enum_kctl, "* ASI1 Sel", "Left");
 		CHECK(snd_soc_deactivate_kctl, "* ASI1 Sel", 0);
 		CHECK(snd_soc_limit_volume, "* Amp Gain Volume", 9); // 15 set by macOS, this is 3 dB below
@@ -758,6 +763,11 @@ static int macaudio_j375_fixup_controls(struct snd_soc_card *card)
 	struct macaudio_snd_data *ma = snd_soc_card_get_drvdata(card);
 
 	if (ma->has_speakers) {
+		if (!please_blow_up_my_speakers) {
+			dev_err(card->dev, "driver can't assure safety on this model, refusing probe\n");
+			return -EINVAL;
+		}
+
 		CHECK(snd_soc_limit_volume, "* Amp Gain Volume", 14); // 20 set by macOS, this is 3 dB below
 	}
 
@@ -769,6 +779,11 @@ static int macaudio_j493_fixup_controls(struct snd_soc_card *card)
 	struct macaudio_snd_data *ma = snd_soc_card_get_drvdata(card);
 
 	if (ma->has_speakers) {
+		if (!please_blow_up_my_speakers) {
+			dev_err(card->dev, "driver can't assure safety on this model, refusing probe\n");
+			return -EINVAL;
+		}
+
 		CHECK(snd_soc_limit_volume, "* Amp Gain Volume", 9); // 15 set by macOS, this is 3 dB below
 	}