ALSA: usb-audio: add front jack channel selector for EMU0204

Add support for front jack channel selector which is present on EMU0204.
It allows to get 4 channels out of this soundcard.

Tested-by: Yury Bushmelev <jay@jay-tech.ru>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 90 insertions, 0 deletions

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index d42a584cf829..3454262358b3 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -433,6 +433,89 @@ static void snd_audigy2nx_proc_read(struct snd_info_entry *entry,
         }
 }
 
+/* EMU0204 */
+static int snd_emu0204_ch_switch_info(struct snd_kcontrol *kcontrol,
+                                      struct snd_ctl_elem_info *uinfo)
+{
+        static const char *texts[2] = {"1/2",
+                                       "3/4"
+        };
+
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+        uinfo->count = 1;
+        uinfo->value.enumerated.items = 2;
+        if (uinfo->value.enumerated.item > 1)
+                uinfo->value.enumerated.item = 1;
+        strcpy(uinfo->value.enumerated.name,
+                texts[uinfo->value.enumerated.item]);
+
+        return 0;
+}
+
+static int snd_emu0204_ch_switch_get(struct snd_kcontrol *kcontrol,
+                                     struct snd_ctl_elem_value *ucontrol)
+{
+        ucontrol->value.enumerated.item[0] = kcontrol->private_value;
+        return 0;
+}
+
+static int snd_emu0204_ch_switch_put(struct snd_kcontrol *kcontrol,
+                                     struct snd_ctl_elem_value *ucontrol)
+{
+        struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
+        unsigned int value = ucontrol->value.enumerated.item[0];
+        int err, changed;
+        unsigned char buf[2];
+
+        if (value > 1)
+                return -EINVAL;
+
+        buf[0] = 0x01;
+        buf[1] = value ? 0x02 : 0x01;
+
+        changed = value != kcontrol->private_value;
+        down_read(&mixer->chip->shutdown_rwsem);
+        if (mixer->chip->shutdown) {
+                err = -ENODEV;
+                goto out;
+        }
+        err = snd_usb_ctl_msg(mixer->chip->dev,
+                      usb_sndctrlpipe(mixer->chip->dev, 0), UAC_SET_CUR,
+                      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
+                      0x0400, 0x0e00, buf, 2);
+ out:
+        up_read(&mixer->chip->shutdown_rwsem);
+        if (err < 0)
+                return err;
+        kcontrol->private_value = value;
+        return changed;
+}
+
+
+static struct snd_kcontrol_new snd_emu0204_controls[] = {
+        {
+                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+                .name = "Front Jack Channels",
+                .info = snd_emu0204_ch_switch_info,
+                .get = snd_emu0204_ch_switch_get,
+                .put = snd_emu0204_ch_switch_put,
+                .private_value = 0,
+        },
+};
+
+static int snd_emu0204_controls_create(struct usb_mixer_interface *mixer)
+{
+        int i, err;
+
+        for (i = 0; i < ARRAY_SIZE(snd_emu0204_controls); ++i) {
+                err = snd_ctl_add(mixer->chip->card,
+                        snd_ctl_new1(&snd_emu0204_controls[i], mixer));
+                if (err < 0)
+                        return err;
+        }
+
+        return 0;
+}
 /* ASUS Xonar U1 / U3 controls */
 
 static int snd_xonar_u1_switch_get(struct snd_kcontrol *kcontrol,
@@ -1545,6 +1628,13 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
                                               snd_audigy2nx_proc_read);
                 break;
 
+        /* EMU0204 */
+        case USB_ID(0x041e, 0x3f19):
+                err = snd_emu0204_controls_create(mixer);
+                if (err < 0)
+                        break;
+                break;
+
         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C400 */
                 err = snd_c400_create_mixer(mixer);