[alsa-devel] [PATCH] Support for muting channels DAC with CA0106 - SB0570

[Trent Piepho]

This patch adds mute controls for the analog output channels.  It does this
by sending SPI commands to the DAC on cards like the SB live 24-bit /
Audigy SE that have an SPI DAC.
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# HG changeset patch
# User Trent Piepho <xyzzy at speakeasy.org>
# Date 1185062879 25200
# Node ID 2c3514f4607b69271148337af15be55d3205af70
# Parent  04b7771f7c31709e9d1883264bcde7e34781a590
ca0106: Add analog mute controls for cards with SPI DAC

Add four mute controls for the analog output channels for cards that use
a spi dac, like SB0570 SB Live!  24-bit / Audigy SE.  The Wolfson dac
doesn't support muting each channel so the controls are mono.

The chip state struct gets a 32-byte array to act as a shadow of the spi
dac registers.  Only two registers are used for mute, but more would be
needed for de-emphasis, DAC power down, phase inversion, and other
features.

diff -r 04b7771f7c31 -r 2c3514f4607b pci/ca0106/ca0106.h
--- a/pci/ca0106/ca0106.h	Fri Jul 20 10:52:46 2007 +0200
+++ b/pci/ca0106/ca0106.h	Sat Jul 21 17:07:59 2007 -0700
@@ -611,6 +611,8 @@ struct snd_ca0106 {
 
 	struct snd_ca_midi midi;
 	struct snd_ca_midi midi2;
+
+	u16 spi_dac_reg[16];
 };
 
 int snd_ca0106_mixer(struct snd_ca0106 *emu);
@@ -627,4 +629,5 @@ void snd_ca0106_ptr_write(struct snd_ca0
 
 int snd_ca0106_i2c_write(struct snd_ca0106 *emu, u32 reg, u32 value);
 
-
+int snd_ca0106_spi_write(struct snd_ca0106 * emu,
+				   unsigned int data);
diff -r 04b7771f7c31 -r 2c3514f4607b pci/ca0106/ca0106_main.c
--- a/pci/ca0106/ca0106_main.c	Fri Jul 20 10:52:46 2007 +0200
+++ b/pci/ca0106/ca0106_main.c	Sat Jul 21 17:07:59 2007 -0700
@@ -1475,8 +1475,11 @@ static int __devinit snd_ca0106_create(i
 		int size, n;
 
 		size = ARRAY_SIZE(spi_dac_init);
-		for (n=0; n < size; n++)
+		for (n=0; n < size; n++) {
 			snd_ca0106_spi_write(chip, spi_dac_init[n]);
+			if ((spi_dac_init[n]>>9) < ARRAY_SIZE(chip->spi_dac_reg))
+				chip->spi_dac_reg[spi_dac_init[n]>>9] = spi_dac_init[n];
+		}
 	}
 
 	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
diff -r 04b7771f7c31 -r 2c3514f4607b pci/ca0106/ca0106_mixer.c
--- a/pci/ca0106/ca0106_mixer.c	Fri Jul 20 10:52:46 2007 +0200
+++ b/pci/ca0106/ca0106_mixer.c	Sat Jul 21 17:07:59 2007 -0700
@@ -470,6 +470,41 @@ static int snd_ca0106_i2c_volume_put(str
 	return change;
 }
 
+static int spi_mute_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 1;
+	return 0;
+}
+
+static int spi_mute_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_ca0106 *emu = snd_kcontrol_chip(kcontrol);
+	unsigned int reg = kcontrol->private_value >> 9;
+	unsigned int bit = kcontrol->private_value & 0x1ff;
+
+	ucontrol->value.integer.value[0] = !(emu->spi_dac_reg[reg] & bit);
+	return 0;
+}
+
+static int spi_mute_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_ca0106 *emu = snd_kcontrol_chip(kcontrol);
+	unsigned int reg = kcontrol->private_value >> 9;
+	unsigned int bit = kcontrol->private_value & 0x1ff;
+	int ret;
+
+	if (ucontrol->value.integer.value[0])
+		emu->spi_dac_reg[reg] &= ~bit;
+	else
+		emu->spi_dac_reg[reg] |= bit;
+
+	ret = snd_ca0106_spi_write(emu, emu->spi_dac_reg[reg]);
+	return ret ? -1 : 1;
+}
+
 #define CA_VOLUME(xname,chid,reg) \
 {								\
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname,	\
@@ -560,6 +595,23 @@ static struct snd_kcontrol_new snd_ca010
         I2C_VOLUME("Mic Capture Volume", 1),
         I2C_VOLUME("Line in Capture Volume", 2),
         I2C_VOLUME("Aux Capture Volume", 3),
+};
+
+#define SPI_SWITCH(xname,reg,bit) \
+{								\
+	.iface 	= SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname,	\
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,		\
+	.info	= spi_mute_info,				\
+	.get	= spi_mute_get,					\
+	.put	= spi_mute_put,					\
+	.private_value = (reg<<9) | (1<<bit)			\
+}
+
+static struct snd_kcontrol_new snd_ca0106_volume_spi_dac_ctls[] __devinitdata = {
+	SPI_SWITCH("Analog Front Playback Switch", 15, 2),
+	SPI_SWITCH("Analog Rear Playback Switch", 9, 3),
+	SPI_SWITCH("Analog Center/LFE Playback Switch", 9, 5),
+	SPI_SWITCH("Analog Side Playback Switch", 9, 4),
 };
 
 static int __devinit remove_ctl(struct snd_card *card, const char *name)
@@ -658,6 +710,13 @@ int __devinit snd_ca0106_mixer(struct sn
 		if (err < 0)
 			return err;
 	}
+	if (emu->details->spi_dac == 1) {
+		for (i = 0; i < ARRAY_SIZE(snd_ca0106_volume_spi_dac_ctls); i++) {
+			err = snd_ctl_add(card, snd_ctl_new1(&snd_ca0106_volume_spi_dac_ctls[i], emu));
+			if (err < 0)
+				return err;
+		}
+	}
         return 0;
 }