On Tue, 16 Jan 2018 05:38:27 +0100, Ian Douglas Scott wrote:
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
sound/usb/mixer_quirks.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+)
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c index e1e7ce9ab217..a91a0b75f6db 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 +1722,80 @@ static int snd_microii_controls_create(struct usb_mixer_interface *mixer) return 0; }
+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];
- kcontrol->private_value = value;
- return snd_soundblaster_e1_switch_update(list->mixer, value);
+}
The put callback returns three types of values: a negative error, 0 for unchanged values, and 1 for the value change. Also, the passed value should be checked beforehand. So, it should be like:
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];
if (kcontrol->private_value = value) return 0; kcontrol->private_value = value; return snd_soundblaster_e1_switch_update(list->mixer, value); }
thanks,
Takashi