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Commit 388fdb8f authored by Ian Douglas Scott's avatar Ian Douglas Scott Committed by Takashi Iwai
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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: default avatarIan Douglas Scott <ian@iandouglasscott.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 1b6832be

sound/usb/mixer_quirks.c

+82 −0
Original line number Diff line number Diff line
@@ -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;