ASoC: nau8824: Add a nau8824_components() helper

Some devices using the NAU8824 have only one speaker. To still have things
working properly this requires the left + right channels to both be mixed
to the left speaker output.

This mixer setup is done by userspace based on UCM profiles. But this
requires userspace to know that there is a mono-speaker. Add a helper
function (for the machine driver) to get a components string providing
this info.

This is done inside the codec driver because the codec driver already
has a DMI quirk table.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20211002211459.110124-3-hdegoede@redhat.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/nau8824.c

@@ -29,6 +29,7 @@
 #include "nau8824.h"
 
 #define NAU8824_JD_ACTIVE_HIGH			BIT(0)
+#define NAU8824_MONO_SPEAKER			BIT(1)
 
 static int nau8824_quirk;
 static int quirk_override = -1;
@@ -1861,7 +1862,25 @@ static const struct dmi_system_id nau8824_quirk_table[] = {
 			DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "20170531"),
 		},
-		.driver_data = (void *)(NAU8824_JD_ACTIVE_HIGH),
+		.driver_data = (void *)(NAU8824_JD_ACTIVE_HIGH |
+					NAU8824_MONO_SPEAKER),
+	},
+	{
+		/* CUBE iwork8 Air */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "cube"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "i1-TF"),
+			DMI_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
+		},
+		.driver_data = (void *)(NAU8824_MONO_SPEAKER),
+	},
+	{
+		/* Pipo W2S */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "PIPO"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "W2S"),
+		},
+		.driver_data = (void *)(NAU8824_MONO_SPEAKER),
 	},
 	{}
 };
@@ -1880,6 +1899,17 @@ static void nau8824_check_quirks(void)
 		nau8824_quirk = (unsigned long)dmi_id->driver_data;
 }
 
+const char *nau8824_components(void)
+{
+	nau8824_check_quirks();
+
+	if (nau8824_quirk & NAU8824_MONO_SPEAKER)
+		return "cfg-spk:1";
+	else
+		return "cfg-spk:2";
+}
+EXPORT_SYMBOL_GPL(nau8824_components);
+
 static int nau8824_i2c_probe(struct i2c_client *i2c,
 	const struct i2c_device_id *id)
 {

sound/soc/codecs/nau8824.h

@@ -470,6 +470,7 @@ struct nau8824_osr_attr {
 
 int nau8824_enable_jack_detect(struct snd_soc_component *component,
 	struct snd_soc_jack *jack);
+const char *nau8824_components(void);
 
 #endif				/* _NAU8824_H */