ALSA: snd-usb-6fire: add analog input volume control

Add a stereo volume control for analog input channel pair 1/2.

Signed-off-by: Torsten Schenk <torsten.schenk@zoho.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 73 insertions, 0 deletions

diff --git a/sound/usb/6fire/control.c b/sound/usb/6fire/control.c
index a2bbf48c6413..07ed914d5e71 100644
--- a/sound/usb/6fire/control.c
+++ b/sound/usb/6fire/control.c
@@ -55,6 +55,7 @@ static const u16 rates_6fire_vl[] = {0x00, 0x01, 0x00, 0x01, 0x00, 0x01};
 static const u16 rates_6fire_vh[] = {0x11, 0x11, 0x10, 0x10, 0x00, 0x00};
 
 static DECLARE_TLV_DB_MINMAX(tlv_output, -9000, 0);
+static DECLARE_TLV_DB_MINMAX(tlv_input, -1500, 1500);
 
 enum {
         DIGITAL_THRU_ONLY_SAMPLERATE = 3
@@ -82,6 +83,20 @@ static void usb6fire_control_output_mute_update(struct control_runtime *rt)
                 comm_rt->write8(comm_rt, 0x12, 0x0e, ~rt->output_mute);
 }
 
+static void usb6fire_control_input_vol_update(struct control_runtime *rt)
+{
+        struct comm_runtime *comm_rt = rt->chip->comm;
+        int i;
+
+        if (comm_rt)
+                for (i = 0; i < 2; i++)
+                        if (!(rt->ivol_updated & (1 << i))) {
+                                comm_rt->write8(comm_rt, 0x12, 0x1c + i,
+                                        rt->input_vol[i] & 0x3f);
+                                rt->ivol_updated |= 1 << i;
+                        }
+}
+
 static void usb6fire_control_line_phono_update(struct control_runtime *rt)
 {
         struct comm_runtime *comm_rt = rt->chip->comm;
@@ -261,6 +276,50 @@ static int usb6fire_control_output_mute_get(struct snd_kcontrol *kcontrol,
         return 0;
 }
 
+static int usb6fire_control_input_vol_info(struct snd_kcontrol *kcontrol,
+                struct snd_ctl_elem_info *uinfo)
+{
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+        uinfo->count = 2;
+        uinfo->value.integer.min = 0;
+        uinfo->value.integer.max = 30;
+        return 0;
+}
+
+static int usb6fire_control_input_vol_put(struct snd_kcontrol *kcontrol,
+                struct snd_ctl_elem_value *ucontrol)
+{
+        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
+        int changed = 0;
+
+        if (rt->input_vol[0] != ucontrol->value.integer.value[0]) {
+                rt->input_vol[0] = ucontrol->value.integer.value[0] - 15;
+                rt->ivol_updated &= ~(1 << 0);
+                changed = 1;
+        }
+        if (rt->input_vol[1] != ucontrol->value.integer.value[1]) {
+                rt->input_vol[1] = ucontrol->value.integer.value[1] - 15;
+                rt->ivol_updated &= ~(1 << 1);
+                changed = 1;
+        }
+
+        if (changed)
+                usb6fire_control_input_vol_update(rt);
+
+        return changed;
+}
+
+static int usb6fire_control_input_vol_get(struct snd_kcontrol *kcontrol,
+                struct snd_ctl_elem_value *ucontrol)
+{
+        struct control_runtime *rt = snd_kcontrol_chip(kcontrol);
+
+        ucontrol->value.integer.value[0] = rt->input_vol[0] + 15;
+        ucontrol->value.integer.value[1] = rt->input_vol[1] + 15;
+
+        return 0;
+}
+
 static int usb6fire_control_line_phono_info(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_info *uinfo)
 {
@@ -454,6 +513,17 @@ static struct __devinitdata snd_kcontrol_new elements[] = {
                 .get = usb6fire_control_digital_thru_get,
                 .put = usb6fire_control_digital_thru_put
         },
+        {
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+                .name = "Analog Capture Volume",
+                .index = 0,
+                .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+                        SNDRV_CTL_ELEM_ACCESS_TLV_READ,
+                .info = usb6fire_control_input_vol_info,
+                .get = usb6fire_control_input_vol_get,
+                .put = usb6fire_control_input_vol_put,
+                .tlv = { .p = tlv_input }
+        },
         {}
 };
 
@@ -518,6 +588,7 @@ int __devinit usb6fire_control_init(struct sfire_chip *chip)
         usb6fire_control_line_phono_update(rt);
         usb6fire_control_output_vol_update(rt);
         usb6fire_control_output_mute_update(rt);
+        usb6fire_control_input_vol_update(rt);
         usb6fire_control_streaming_update(rt);
 
         ret = usb6fire_control_add_virtual(rt, chip->card,
diff --git a/sound/usb/6fire/control.h b/sound/usb/6fire/control.h
index 9f9eb647bc6b..9a596d95474a 100644
--- a/sound/usb/6fire/control.h
+++ b/sound/usb/6fire/control.h
@@ -46,6 +46,8 @@ struct control_runtime {
         u8 output_vol[6];
         u8 ovol_updated;
         u8 output_mute;
+        s8 input_vol[2];
+        u8 ivol_updated;
 };
 
 int __devinit usb6fire_control_init(struct sfire_chip *chip);