ALSA: snd-usb-caiaq: Do not expose hardware input mode 0 of A4DJ

In the context of the Audio 4 DJ (when compared to Audio 8 DJ), hardware
input mode 0 is not used. Expose modes 1 (line) and 2 (phono) to the user
as modes 0 and 1 respectively.

Signed-off-by: Mark Hills <mark@pogo.org.uk>
Acked-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 29 insertions, 3 deletions

diff --git a/sound/usb/caiaq/caiaq-control.c b/sound/usb/caiaq/caiaq-control.c
index 1f9531d0fce4..136ef34300d1 100644
--- a/sound/usb/caiaq/caiaq-control.c
+++ b/sound/usb/caiaq/caiaq-control.c
@@ -44,16 +44,24 @@ static int control_info(struct snd_kcontrol *kcontrol,
         uinfo->count = 1;
         pos &= ~CNT_INTVAL;
 
-        if (((id == USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ)) ||
-             (id == USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ)))
+        if (id == USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ)
                 && (pos == 0)) {
-                /* current input mode of A8DJ and A4DJ */
+                /* current input mode of A8DJ */
                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
                 uinfo->value.integer.min = 0;
                 uinfo->value.integer.max = 2;
                 return 0;
         }
 
+        if (id == USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ)
+                && (pos == 0)) {
+                /* current input mode of A4DJ */
+                uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+                uinfo->value.integer.min = 0;
+                uinfo->value.integer.max = 1;
+                return 0;
+        }
+
         if (is_intval) {
                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
                 uinfo->value.integer.min = 0;
@@ -74,6 +82,14 @@ static int control_get(struct snd_kcontrol *kcontrol,
         struct snd_usb_caiaqdev *dev = caiaqdev(chip->card);
         int pos = kcontrol->private_value;
 
+        if (dev->chip.usb_id ==
+                USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ)) {
+                /* A4DJ has only one control */
+                /* do not expose hardware input mode 0 */
+                ucontrol->value.integer.value[0] = dev->control_state[0] - 1;
+                return 0;
+        }
+
         if (pos & CNT_INTVAL)
                 ucontrol->value.integer.value[0]
                         = dev->control_state[pos & ~CNT_INTVAL];
@@ -91,6 +107,16 @@ static int control_put(struct snd_kcontrol *kcontrol,
         struct snd_usb_caiaqdev *dev = caiaqdev(chip->card);
         int pos = kcontrol->private_value;
 
+        if (dev->chip.usb_id ==
+                USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ)) {
+                /* A4DJ has only one control */
+                /* do not expose hardware input mode 0 */
+                dev->control_state[0] = ucontrol->value.integer.value[0] + 1;
+                snd_usb_caiaq_send_command(dev, EP1_CMD_WRITE_IO,
+                                dev->control_state, sizeof(dev->control_state));
+                return 1;
+        }
+
         if (pos & CNT_INTVAL) {
                 dev->control_state[pos & ~CNT_INTVAL]
                         = ucontrol->value.integer.value[0];