[ALSA] Add Mic capture support.

CA0106 driver
Notes: This adds a new mixer item to switch between Mic and Line-in.
Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>

sound/pci/ca0106/ca0106.h

@@ -589,6 +589,7 @@ struct snd_ca0106 {
 	u32 spdif_bits[4];             /* s/pdif out setup */
 	int spdif_enable;
 	int capture_source;
+	int capture_mic_line_in;
 
 	struct snd_dma_buffer buffer;
 };

sound/pci/ca0106/ca0106_mixer.c

 /*
  *  Copyright (c) 2004 James Courtier-Dutton <James@superbug.demon.co.uk>
  *  Driver CA0106 chips. e.g. Sound Blaster Audigy LS and Live 24bit
- *  Version: 0.0.16
+ *  Version: 0.0.17
  *
  *  FEATURES currently supported:
  *    See ca0106_main.c for features.
@@ -37,6 +37,8 @@
  *    Separated ca0106.c into separate functional .c files.
  *  0.0.16
  *    Modified Copyright message.
+ *  0.0.17
+ *    Implement Mic and Line in Capture.
  *
  *  This code was initally based on code from ALSA's emu10k1x.c which is:
  *  Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
@@ -183,6 +185,65 @@ static snd_kcontrol_new_t snd_ca0106_capture_source __devinitdata =
 	.put =		snd_ca0106_capture_source_put
 };
 
+static int snd_ca0106_capture_mic_line_in_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
+{
+	static char *texts[2] = { "Line in", "Mic in" };
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+	uinfo->value.enumerated.items = 2;
+	if (uinfo->value.enumerated.item > 1)
+                uinfo->value.enumerated.item = 1;
+	strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
+	return 0;
+}
+
+static int snd_ca0106_capture_mic_line_in_get(snd_kcontrol_t * kcontrol,
+					snd_ctl_elem_value_t * ucontrol)
+{
+	ca0106_t *emu = snd_kcontrol_chip(kcontrol);
+
+	ucontrol->value.enumerated.item[0] = emu->capture_mic_line_in;
+	return 0;
+}
+
+static int snd_ca0106_capture_mic_line_in_put(snd_kcontrol_t * kcontrol,
+					snd_ctl_elem_value_t * ucontrol)
+{
+	ca0106_t *emu = snd_kcontrol_chip(kcontrol);
+	unsigned int val;
+	int change = 0;
+	u32 tmp;
+
+	val = ucontrol->value.enumerated.item[0] ;
+	change = (emu->capture_mic_line_in != val);
+	if (change) {
+		emu->capture_mic_line_in = val;
+		if (val) {
+			snd_ca0106_i2c_write(emu, ADC_MUX, ADC_MUX_PHONE); /* Mute input */
+			tmp = inl(emu->port+GPIO) & ~0x400;
+			tmp = tmp | 0x400;
+			outl(tmp, emu->port+GPIO);
+			snd_ca0106_i2c_write(emu, ADC_MUX, ADC_MUX_MIC);
+		} else {
+			snd_ca0106_i2c_write(emu, ADC_MUX, ADC_MUX_PHONE); /* Mute input */
+			tmp = inl(emu->port+GPIO) & ~0x400;
+			outl(tmp, emu->port+GPIO);
+			snd_ca0106_i2c_write(emu, ADC_MUX, ADC_MUX_LINEIN);
+		}
+	}
+        return change;
+}
+
+static snd_kcontrol_new_t snd_ca0106_capture_mic_line_in __devinitdata =
+{
+	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name =		"Mic/Line in Capture",
+	.info =		snd_ca0106_capture_mic_line_in_info,
+	.get =		snd_ca0106_capture_mic_line_in_get,
+	.put =		snd_ca0106_capture_mic_line_in_put
+};
+
 static int snd_ca0106_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
 {
 	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
@@ -620,6 +681,12 @@ int __devinit snd_ca0106_mixer(ca0106_t *emu)
 		return -ENOMEM;
 	if ((err = snd_ctl_add(card, kctl)))
 		return err;
+	if (emu->details->i2c_adc == 1) {
+		if ((kctl = snd_ctl_new1(&snd_ca0106_capture_mic_line_in, emu)) == NULL)
+			return -ENOMEM;
+		if ((err = snd_ctl_add(card, kctl)))
+			return err;
+	}
 	if ((kctl = snd_ctl_new1(&snd_ca0106_spdif_control, emu)) == NULL)
 		return -ENOMEM;
 	if ((err = snd_ctl_add(card, kctl)))