ALSA: usb-audio: Support changing input on Sound Blaster E1

The E1 has two headphone jacks, one of which can be set as a microphone
input. In the default mode, it uses the built-in microphone as an input.
By sending a special command, the second headphone jack is instead used
as an input.

This might work with the E3 as well, but I don't have one of those to
test it.

Signed-off-by: Ian Douglas Scott <ian@iandouglasscott.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 82 insertions, 0 deletions

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index e1e7ce9ab217..e6359d341878 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -27,6 +27,7 @@
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */
 
+#include <linux/hid.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/usb.h>
@@ -1721,6 +1722,83 @@ static int snd_microii_controls_create(struct usb_mixer_interface *mixer)
         return 0;
 }
 
+/* Creative Sound Blaster E1 */
+
+static int snd_soundblaster_e1_switch_get(struct snd_kcontrol *kcontrol,
+                                          struct snd_ctl_elem_value *ucontrol)
+{
+        ucontrol->value.integer.value[0] = kcontrol->private_value;
+        return 0;
+}
+
+static int snd_soundblaster_e1_switch_update(struct usb_mixer_interface *mixer,
+                                             unsigned char state)
+{
+        struct snd_usb_audio *chip = mixer->chip;
+        int err;
+        unsigned char buff[2];
+
+        buff[0] = 0x02;
+        buff[1] = state ? 0x02 : 0x00;
+
+        err = snd_usb_lock_shutdown(chip);
+        if (err < 0)
+                return err;
+        err = snd_usb_ctl_msg(chip->dev,
+                        usb_sndctrlpipe(chip->dev, 0), HID_REQ_SET_REPORT,
+                        USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
+                        0x0202, 3, buff, 2);
+        snd_usb_unlock_shutdown(chip);
+        return err;
+}
+
+static int snd_soundblaster_e1_switch_put(struct snd_kcontrol *kcontrol,
+                                          struct snd_ctl_elem_value *ucontrol)
+{
+        struct usb_mixer_elem_list *list = snd_kcontrol_chip(kcontrol);
+        unsigned char value = !!ucontrol->value.integer.value[0];
+        int err;
+
+        if (kcontrol->private_value == value)
+                return 0;
+        kcontrol->private_value = value;
+        err = snd_soundblaster_e1_switch_update(list->mixer, value);
+        return err < 0 ? err : 1;
+}
+
+static int snd_soundblaster_e1_switch_resume(struct usb_mixer_elem_list *list)
+{
+        return snd_soundblaster_e1_switch_update(list->mixer,
+                                                 list->kctl->private_value);
+}
+
+static int snd_soundblaster_e1_switch_info(struct snd_kcontrol *kcontrol,
+                                           struct snd_ctl_elem_info *uinfo)
+{
+        static const char *const texts[2] = {
+                "Mic", "Aux"
+        };
+
+        return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
+}
+
+static struct snd_kcontrol_new snd_soundblaster_e1_input_switch = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "Input Source",
+        .info = snd_soundblaster_e1_switch_info,
+        .get = snd_soundblaster_e1_switch_get,
+        .put = snd_soundblaster_e1_switch_put,
+        .private_value = 0,
+};
+
+static int snd_soundblaster_e1_switch_create(struct usb_mixer_interface *mixer)
+{
+        return add_single_ctl_with_resume(mixer, 0,
+                                          snd_soundblaster_e1_switch_resume,
+                                          &snd_soundblaster_e1_input_switch,
+                                          NULL);
+}
+
 int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
 {
         int err = 0;
@@ -1802,6 +1880,10 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
         case USB_ID(0x1235, 0x800c): /* Focusrite Scarlett 18i20 */
                 err = snd_scarlett_controls_create(mixer);
                 break;
+
+        case USB_ID(0x041e, 0x323b): /* Creative Sound Blaster E1 */
+                err = snd_soundblaster_e1_switch_create(mixer);
+                break;
         }
 
         return err;