[ALSA] Fix volume control for the AK4358 DAC
Jochen Voss [Wed, 23 Aug 2006 16:35:35 +0000 (18:35 +0200)]
Fix volume control for the AK4358 DAC.
The attenuation control registers of the AK4358 use only 7bit for the
volume, the msb is used to enable attenuation output.  Without this
patch there are 256 volume levels the lower 128 of which are mute.

Signed-off-by: Jochen Voss <voss@seehuhn.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/i2c/other/ak4xxx-adda.c

index 0aea536..89fc3cb 100644 (file)
@@ -284,11 +284,13 @@ EXPORT_SYMBOL(snd_akm4xxx_init);
 
 #define AK_GET_CHIP(val)               (((val) >> 8) & 0xff)
 #define AK_GET_ADDR(val)               ((val) & 0xff)
-#define AK_GET_SHIFT(val)              (((val) >> 16) & 0x7f)
+#define AK_GET_SHIFT(val)              (((val) >> 16) & 0x3f)
+#define AK_GET_NEEDSMSB(val)           (((val) >> 22) & 1)
 #define AK_GET_INVERT(val)             (((val) >> 23) & 1)
 #define AK_GET_MASK(val)               (((val) >> 24) & 0xff)
 #define AK_COMPOSE(chip,addr,shift,mask) \
        (((chip) << 8) | (addr) | ((shift) << 16) | ((mask) << 24))
+#define AK_NEEDSMSB                    (1<<22)
 #define AK_INVERT                      (1<<23)
 
 static int snd_akm4xxx_volume_info(struct snd_kcontrol *kcontrol,
@@ -309,10 +311,13 @@ static int snd_akm4xxx_volume_get(struct snd_kcontrol *kcontrol,
        struct snd_akm4xxx *ak = snd_kcontrol_chip(kcontrol);
        int chip = AK_GET_CHIP(kcontrol->private_value);
        int addr = AK_GET_ADDR(kcontrol->private_value);
+       int needsmsb = AK_GET_NEEDSMSB(kcontrol->private_value);
        int invert = AK_GET_INVERT(kcontrol->private_value);
        unsigned int mask = AK_GET_MASK(kcontrol->private_value);
        unsigned char val = snd_akm4xxx_get(ak, chip, addr);
-       
+
+       if (needsmsb)
+               val &= 0x7f;
        ucontrol->value.integer.value[0] = invert ? mask - val : val;
        return 0;
 }
@@ -323,6 +328,7 @@ static int snd_akm4xxx_volume_put(struct snd_kcontrol *kcontrol,
        struct snd_akm4xxx *ak = snd_kcontrol_chip(kcontrol);
        int chip = AK_GET_CHIP(kcontrol->private_value);
        int addr = AK_GET_ADDR(kcontrol->private_value);
+       int needsmsb = AK_GET_NEEDSMSB(kcontrol->private_value);
        int invert = AK_GET_INVERT(kcontrol->private_value);
        unsigned int mask = AK_GET_MASK(kcontrol->private_value);
        unsigned char nval = ucontrol->value.integer.value[0] % (mask+1);
@@ -330,6 +336,8 @@ static int snd_akm4xxx_volume_put(struct snd_kcontrol *kcontrol,
 
        if (invert)
                nval = mask - nval;
+       if (needsmsb)
+               nval |= 0x80;
        change = snd_akm4xxx_get(ak, chip, addr) != nval;
        if (change)
                snd_akm4xxx_write(ak, chip, addr, nval);
@@ -354,13 +362,19 @@ static int snd_akm4xxx_stereo_volume_get(struct snd_kcontrol *kcontrol,
        struct snd_akm4xxx *ak = snd_kcontrol_chip(kcontrol);
        int chip = AK_GET_CHIP(kcontrol->private_value);
        int addr = AK_GET_ADDR(kcontrol->private_value);
+       int needsmsb = AK_GET_NEEDSMSB(kcontrol->private_value);
        int invert = AK_GET_INVERT(kcontrol->private_value);
        unsigned int mask = AK_GET_MASK(kcontrol->private_value);
-       unsigned char val = snd_akm4xxx_get(ak, chip, addr);
-       
+       unsigned char val;
+
+       val = snd_akm4xxx_get(ak, chip, addr);
+       if (needsmsb)
+               val &= 0x7f;
        ucontrol->value.integer.value[0] = invert ? mask - val : val;
 
        val = snd_akm4xxx_get(ak, chip, addr+1);
+       if (needsmsb)
+               val &= 0x7f;
        ucontrol->value.integer.value[1] = invert ? mask - val : val;
 
        return 0;
@@ -372,6 +386,7 @@ static int snd_akm4xxx_stereo_volume_put(struct snd_kcontrol *kcontrol,
        struct snd_akm4xxx *ak = snd_kcontrol_chip(kcontrol);
        int chip = AK_GET_CHIP(kcontrol->private_value);
        int addr = AK_GET_ADDR(kcontrol->private_value);
+       int needsmsb = AK_GET_NEEDSMSB(kcontrol->private_value);
        int invert = AK_GET_INVERT(kcontrol->private_value);
        unsigned int mask = AK_GET_MASK(kcontrol->private_value);
        unsigned char nval = ucontrol->value.integer.value[0] % (mask+1);
@@ -379,6 +394,8 @@ static int snd_akm4xxx_stereo_volume_put(struct snd_kcontrol *kcontrol,
 
        if (invert)
                nval = mask - nval;
+       if (needsmsb)
+               nval |= 0x80;
        change0 = snd_akm4xxx_get(ak, chip, addr) != nval;
        if (change0)
                snd_akm4xxx_write(ak, chip, addr, nval);
@@ -386,6 +403,8 @@ static int snd_akm4xxx_stereo_volume_put(struct snd_kcontrol *kcontrol,
        nval = ucontrol->value.integer.value[1] % (mask+1);
        if (invert)
                nval = mask - nval;
+       if (needsmsb)
+               nval |= 0x80;
        change1 = snd_akm4xxx_get(ak, chip, addr+1) != nval;
        if (change1)
                snd_akm4xxx_write(ak, chip, addr+1, nval);
@@ -585,16 +604,13 @@ int snd_akm4xxx_build_controls(struct snd_akm4xxx *ak)
                        /* register 4-9, chip #0 only */
                        ctl->private_value = AK_COMPOSE(0, idx + 4, 0, 255);
                        break;
-               case SND_AK4358:
-                       if (idx >= 6)
-                               /* register 4-9, chip #0 only */
-                               ctl->private_value =
-                                       AK_COMPOSE(0, idx + 5, 0, 255);
-                       else
-                               /* register 4-9, chip #0 only */
-                               ctl->private_value =
-                                       AK_COMPOSE(0, idx + 4, 0, 255);
+               case SND_AK4358: {
+                       /* register 4-9 and 11-12, chip #0 only */
+                       int  addr = idx < 6 ? idx + 4 : idx + 5;
+                       ctl->private_value =
+                               AK_COMPOSE(0, addr, 0, 127) | AK_NEEDSMSB;
                        break;
+               }
                case SND_AK4381:
                        /* register 3 & 4 */
                        ctl->private_value =