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>

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index d42a584cf8292d99d349a309f55e2d1724e45898..3454262358b398913779954846ab12c11e7c5973 100644 (file)
--- 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);