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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>
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ids1024 authored and tiwai committed Jan 16, 2018
1 parent 1b6832b commit 388fdb8f882af67ff8394d9420c1e0e42ba35619
Showing with 82 additions and 0 deletions.
  1. +82 −0 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;

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