[ALSA] Stereo controls for M-Audio Revolution cards

This patch adds stereo controls to revo cards by making the ak4xxx
driver mixers configurable from the card driver.

Signed-off-by: Jani Alinikula <janialinikula@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

3 files changed, 105 insertions, 9 deletions

diff --git a/include/sound/ak4xxx-adda.h b/include/sound/ak4xxx-adda.h
index 3bf5911fe827..acf8cc1292e0 100644
--- a/include/sound/ak4xxx-adda.h
+++ b/include/sound/ak4xxx-adda.h
@@ -53,6 +53,8 @@ struct snd_akm4xxx {
                 SND_AK4524, SND_AK4528, SND_AK4529,
                 SND_AK4355, SND_AK4358, SND_AK4381
         } type;
+        unsigned int *num_stereo;                       /* array of combined counts for the mixer */
+        char **channel_names;                           /* array of mixer channel names */
         struct snd_ak4xxx_ops ops;
 };
 
diff --git a/sound/i2c/other/ak4xxx-adda.c b/sound/i2c/other/ak4xxx-adda.c
index 045e32a311e0..f68bd740e1a1 100644
--- a/sound/i2c/other/ak4xxx-adda.c
+++ b/sound/i2c/other/ak4xxx-adda.c
@@ -292,6 +292,64 @@ static int snd_akm4xxx_volume_put(struct snd_kcontrol *kcontrol,
         return change;
 }
 
+static int snd_akm4xxx_stereo_volume_info(struct snd_kcontrol *kcontrol,
+                                   struct snd_ctl_elem_info *uinfo)
+{
+        unsigned int mask = AK_GET_MASK(kcontrol->private_value);
+
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+        uinfo->count = 2;
+        uinfo->value.integer.min = 0;
+        uinfo->value.integer.max = mask;
+        return 0;
+}
+
+static int snd_akm4xxx_stereo_volume_get(struct snd_kcontrol *kcontrol,
+                                  struct snd_ctl_elem_value *ucontrol)
+{
+        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 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);
+        
+        ucontrol->value.integer.value[0] = invert ? mask - val : val;
+
+        val = snd_akm4xxx_get(ak, chip, addr+1);
+        ucontrol->value.integer.value[1] = invert ? mask - val : val;
+
+        return 0;
+}
+
+static int snd_akm4xxx_stereo_volume_put(struct snd_kcontrol *kcontrol,
+                                  struct snd_ctl_elem_value *ucontrol)
+{
+        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 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);
+        int change0, change1;
+
+        if (invert)
+                nval = mask - nval;
+        change0 = snd_akm4xxx_get(ak, chip, addr) != nval;
+        if (change0)
+                snd_akm4xxx_write(ak, chip, addr, nval);
+
+        nval = ucontrol->value.integer.value[1] % (mask+1);
+        if (invert)
+                nval = mask - nval;
+        change1 = snd_akm4xxx_get(ak, chip, addr+1) != nval;
+        if (change1)
+                snd_akm4xxx_write(ak, chip, addr+1, nval);
+
+
+        return change0 || change1;
+}
+
 static int snd_akm4xxx_ipga_gain_info(struct snd_kcontrol *kcontrol,
                                       struct snd_ctl_elem_info *uinfo)
 {
@@ -377,20 +435,35 @@ int snd_akm4xxx_build_controls(struct snd_akm4xxx *ak)
         unsigned int idx, num_emphs;
         struct snd_kcontrol *ctl;
         int err;
+        int mixer_ch = 0;
+        int num_stereo;
 
         ctl = kmalloc(sizeof(*ctl), GFP_KERNEL);
         if (! ctl)
                 return -ENOMEM;
 
-        for (idx = 0; idx < ak->num_dacs; ++idx) {
+        for (idx = 0; idx < ak->num_dacs; ) {
                 memset(ctl, 0, sizeof(*ctl));
-                strcpy(ctl->id.name, "DAC Volume");
-                ctl->id.index = idx + ak->idx_offset * 2;
+                if (ak->channel_names == NULL) {
+                        strcpy(ctl->id.name, "DAC Volume");
+                        num_stereo = 1;
+                        ctl->id.index = mixer_ch + ak->idx_offset * 2;
+                } else {
+                        strcpy(ctl->id.name, ak->channel_names[mixer_ch]);
+                        num_stereo = ak->num_stereo[mixer_ch];
+                        ctl->id.index = 0; //mixer_ch + ak->idx_offset * 2;
+                }
                 ctl->id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
                 ctl->count = 1;
-                ctl->info = snd_akm4xxx_volume_info;
-                ctl->get = snd_akm4xxx_volume_get;
-                ctl->put = snd_akm4xxx_volume_put;
+                if (num_stereo == 2) {
+                        ctl->info = snd_akm4xxx_stereo_volume_info;
+                        ctl->get = snd_akm4xxx_stereo_volume_get;
+                        ctl->put = snd_akm4xxx_stereo_volume_put;
+                } else {
+                        ctl->info = snd_akm4xxx_volume_info;
+                        ctl->get = snd_akm4xxx_volume_get;
+                        ctl->put = snd_akm4xxx_volume_put;
+                }
                 switch (ak->type) {
                 case SND_AK4524:
                         ctl->private_value = AK_COMPOSE(idx/2, (idx%2) + 6, 0, 127); /* register 6 & 7 */
@@ -419,9 +492,13 @@ int snd_akm4xxx_build_controls(struct snd_akm4xxx *ak)
                         err = -EINVAL;
                         goto __error;
                 }
+
                 ctl->private_data = ak;
                 if ((err = snd_ctl_add(ak->card, snd_ctl_new(ctl, SNDRV_CTL_ELEM_ACCESS_READ|SNDRV_CTL_ELEM_ACCESS_WRITE))) < 0)
                         goto __error;
+
+                idx += num_stereo;
+                mixer_ch++;
         }
         for (idx = 0; idx < ak->num_adcs && ak->type == SND_AK4524; ++idx) {
                 memset(ctl, 0, sizeof(*ctl));
diff --git a/sound/pci/ice1712/revo.c b/sound/pci/ice1712/revo.c
index b5754b32b802..fec9440cb310 100644
--- a/sound/pci/ice1712/revo.c
+++ b/sound/pci/ice1712/revo.c
@@ -87,12 +87,25 @@ static void revo_set_rate_val(struct snd_akm4xxx *ak, unsigned int rate)
  * initialize the chips on M-Audio Revolution cards
  */
 
+static unsigned int revo71_num_stereo_front[] = {2};
+static char *revo71_channel_names_front[] = {"PCM Playback Volume"};
+
+static unsigned int revo71_num_stereo_surround[] = {1, 1, 2, 2};
+static char *revo71_channel_names_surround[] = {"PCM Center Playback Volume", "PCM LFE Playback Volume",
+                                                "PCM Side Playback Volume", "PCM Rear Playback Volume"};
+
+static unsigned int revo51_num_stereo[] = {2, 1, 1, 2};
+static char *revo51_channel_names[] = {"PCM Playback Volume", "PCM Center Playback Volume",
+                                        "PCM LFE Playback Volume", "PCM Rear Playback Volume"};
+
 static struct snd_akm4xxx akm_revo_front __devinitdata = {
         .type = SND_AK4381,
         .num_dacs = 2,
         .ops = {
                 .set_rate_val = revo_set_rate_val
-        }
+        },
+        .num_stereo = revo71_num_stereo_front,
+        .channel_names = revo71_channel_names_front
 };
 
 static struct snd_ak4xxx_private akm_revo_front_priv __devinitdata = {
@@ -113,7 +126,9 @@ static struct snd_akm4xxx akm_revo_surround __devinitdata = {
         .num_dacs = 6,
         .ops = {
                 .set_rate_val = revo_set_rate_val
-        }
+        },
+        .num_stereo = revo71_num_stereo_surround,
+        .channel_names = revo71_channel_names_surround
 };
 
 static struct snd_ak4xxx_private akm_revo_surround_priv __devinitdata = {
@@ -133,7 +148,9 @@ static struct snd_akm4xxx akm_revo51 __devinitdata = {
         .num_dacs = 6,
         .ops = {
                 .set_rate_val = revo_set_rate_val
-        }
+        },
+        .num_stereo = revo51_num_stereo,
+        .channel_names = revo51_channel_names
 };
 
 static struct snd_ak4xxx_private akm_revo51_priv __devinitdata = {