[ALSA] #2/4 for Zoom Video - resolve number of record sources

Modules: ES18xx driver

Second of 4 es18xx.c patches culminating in Zoom Video support.

This patch changes the 'record source' mux routines to reflect the fact
that not all of the
supported chipsets have 8 possible inputs. Some have 4 and some have 5.

Testing:
This work was initially done on the source from the Debian Sarge ALSA
package, then tested
on an ES1879 and an ES1878 machine. Patches were created against the
Sarge code and then edited
to apply correctly to the ALSA cvs code. Lastly the patched ALSA cvs
code was test for
successful compilation. No additional testing was done on the ALSA cvs
version.

Signed-off-by: Mark Salazar <markTheCoder@justmyself.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/es18xx.c

@@ -939,37 +939,118 @@ static int snd_es18xx_capture_close(struct snd_pcm_substream *substream)
  *  MIXER part
  */
 
+/* Record source mux routines:
+ * Depending on the chipset this mux switches between 4, 5, or 8 possible inputs.
+ * bit table for the 4/5 source mux:
+ * reg 1C:
+ *  b2 b1 b0   muxSource
+ *   x  0  x   microphone
+ *   0  1  x   CD
+ *   1  1  0   line
+ *   1  1  1   mixer
+ * if it's "mixer" and it's a 5 source mux chipset then reg 7A bit 3 determines
+ * either the play mixer or the capture mixer.
+ *
+ * "map4Source" translates from source number to reg bit pattern
+ * "invMap4Source" translates from reg bit pattern to source number
+ */
+
 static int snd_es18xx_info_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 {
-	static char *texts[8] = {
+	static char *texts4Source[4] = {
+		"Mic", "CD", "Line", "Master"
+	};
+	static char *texts5Source[5] = {
+		"Mic", "CD", "Line", "Master", "Mix"
+	};
+	static char *texts8Source[8] = {
 		"Mic", "Mic Master", "CD", "AOUT",
 		"Mic1", "Mix", "Line", "Master"
 	};
+	struct snd_es18xx *chip = snd_kcontrol_chip(kcontrol);
 
 	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
 	uinfo->count = 1;
-	uinfo->value.enumerated.items = 8;
-	if (uinfo->value.enumerated.item > 7)
-		uinfo->value.enumerated.item = 7;
-	strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
+	switch (chip->version) {
+	case 0x1868:
+	case 0x1878:
+		uinfo->value.enumerated.items = 4;
+		if (uinfo->value.enumerated.item > 3)
+			uinfo->value.enumerated.item = 3;
+		strcpy(uinfo->value.enumerated.name, texts4Source[uinfo->value.enumerated.item]);
+		break;
+	case 0x1887:
+	case 0x1888:
+		uinfo->value.enumerated.items = 5;
+		if (uinfo->value.enumerated.item > 4)
+			uinfo->value.enumerated.item = 4;
+		strcpy(uinfo->value.enumerated.name, texts5Source[uinfo->value.enumerated.item]);
+		break;
+	case 0x1869: /* DS somewhat contradictory for 1869: could be be 5 or 8 */
+	case 0x1879:
+		uinfo->value.enumerated.items = 8;
+		if (uinfo->value.enumerated.item > 7)
+			uinfo->value.enumerated.item = 7;
+		strcpy(uinfo->value.enumerated.name, texts8Source[uinfo->value.enumerated.item]);
+		break;
+	default:
+		return -EINVAL;
+	}
 	return 0;
 }
 
 static int snd_es18xx_get_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 {
+	static unsigned char invMap4Source[8] = {0, 0, 1, 1, 0, 0, 2, 3};
 	struct snd_es18xx *chip = snd_kcontrol_chip(kcontrol);
-	ucontrol->value.enumerated.item[0] = snd_es18xx_mixer_read(chip, 0x1c) & 0x07;
+	int muxSource = snd_es18xx_mixer_read(chip, 0x1c) & 0x07;
+	if (!(chip->version == 0x1869 || chip->version == 0x1879)) {
+		muxSource = invMap4Source[muxSource];
+		if (muxSource==3 && 
+		    (chip->version == 0x1887 || chip->version == 0x1888) &&
+		    (snd_es18xx_mixer_read(chip, 0x7a) & 0x08)
+		) 
+			muxSource = 4;
+	}
+	ucontrol->value.enumerated.item[0] = muxSource;
 	return 0;
 }
 
 static int snd_es18xx_put_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 {
+	static unsigned char map4Source[4] = {0, 2, 6, 7};
 	struct snd_es18xx *chip = snd_kcontrol_chip(kcontrol);
 	unsigned char val = ucontrol->value.enumerated.item[0];
-	
-	if (val > 7)
+	unsigned char retVal = 0;
+
+	switch (chip->version) {
+ /* 5 source chips */
+	case 0x1887:
+	case 0x1888:
+		if (val > 4)
+			return -EINVAL;
+		if (val == 4) {
+			retVal = snd_es18xx_mixer_bits(chip, 0x7a, 0x08, 0x08) != 0x08;
+			val = 3;
+		} else
+			retVal = snd_es18xx_mixer_bits(chip, 0x7a, 0x08, 0x00) != 0x00;
+ /* 4 source chips */
+	case 0x1868:
+	case 0x1878:
+		if (val > 3)
+			return -EINVAL;
+		val = map4Source[val];
+		break;
+ /* 8 source chips */
+	case 0x1869:
+	case 0x1879:
+		if (val > 7)
+			return -EINVAL;
+		break;
+	default:
 		return -EINVAL;
-	return snd_es18xx_mixer_bits(chip, 0x1c, 0x07, val) != val;
+	}
+	return (snd_es18xx_mixer_bits(chip, 0x1c, 0x07, val) != val) || retVal;
 }
 
 static int snd_es18xx_info_spatializer_enable(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)