path: root/sound/usb/mixer_quirks.c

/*
 *   USB Audio Driver for ALSA
 *
 *   Quirks and vendor-specific extensions for mixer interfaces
 *
 *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
 *
 *   Many codes borrowed from audio.c by
 *	    Alan Cox (alan@lxorguk.ukuu.org.uk)
 *	    Thomas Sailer (sailer@ife.ee.ethz.ch)
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>

#include <sound/core.h>
#include <sound/control.h>
#include <sound/hwdep.h>
#include <sound/info.h>

#include "usbaudio.h"
#include "mixer.h"
#include "mixer_quirks.h"
#include "helper.h"

extern struct snd_kcontrol_new *snd_usb_feature_unit_ctl;

/* private_free callback */
static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
{
	kfree(kctl->private_data);
	kctl->private_data = NULL;
}

/* This function allows for the creation of standard UAC controls.
 * See the quirks for M-Audio FTUs or Ebox-44.
 * If you don't want to set a TLV callback pass NULL.
 *
 * Since there doesn't seem to be a devices that needs a multichannel
 * version, we keep it mono for simplicity.
 */
static int snd_create_std_mono_ctl(struct usb_mixer_interface *mixer,
				unsigned int unitid,
				unsigned int control,
				unsigned int cmask,
				int val_type,
				const char *name,
				snd_kcontrol_tlv_rw_t *tlv_callback)
{
	int err;
	struct usb_mixer_elem_info *cval;
	struct snd_kcontrol *kctl;

	cval = kzalloc(sizeof(*cval), GFP_KERNEL);
	if (!cval)
		return -ENOMEM;

	cval->id = unitid;
	cval->mixer = mixer;
	cval->val_type = val_type;
	cval->channels = 1;
	cval->control = control;
	cval->cmask = cmask;

	/* get_min_max() is called only for integer volumes later,
	 * so provide a short-cut for booleans */
	cval->min = 0;
	cval->max = 1;
	cval->res = 0;
	cval->dBmin = 0;
	cval->dBmax = 0;

	/* Create control */
	kctl = snd_ctl_new1(snd_usb_feature_unit_ctl, cval);
	if (!kctl) {
		kfree(cval);
		return -ENOMEM;
	}

	/* Set name */
	snprintf(kctl->id.name, sizeof(kctl->id.name), name);
	kctl->private_free = usb_mixer_elem_free;

	/* set TLV */
	if (tlv_callback) {
		kctl->tlv.c = tlv_callback;
		kctl->vd[0].access |=
			SNDRV_CTL_ELEM_ACCESS_TLV_READ |
			SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
	}
	/* Add control to mixer */
	err = snd_usb_mixer_add_control(mixer, kctl);
	if (err < 0)
		return err;

	return 0;
}

/*
 * Sound Blaster remote control configuration
 *
 * format of remote control data:
 * Extigy:       xx 00
 * Audigy 2 NX:  06 80 xx 00 00 00
 * Live! 24-bit: 06 80 xx yy 22 83
 */
static const struct rc_config {
	u32 usb_id;
	u8  offset;
	u8  length;
	u8  packet_length;
	u8  min_packet_length; /* minimum accepted length of the URB result */
	u8  mute_mixer_id;
	u32 mute_code;
} rc_configs[] = {
	{ USB_ID(0x041e, 0x3000), 0, 1, 2, 1,  18, 0x0013 }, /* Extigy       */
	{ USB_ID(0x041e, 0x3020), 2, 1, 6, 6,  18, 0x0013 }, /* Audigy 2 NX  */
	{ USB_ID(0x041e, 0x3040), 2, 2, 6, 6,  2,  0x6e91 }, /* Live! 24-bit */
	{ USB_ID(0x041e, 0x3042), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 */
	{ USB_ID(0x041e, 0x30df), 0, 1, 1, 1,  1,  0x000d }, /* Usb X-Fi S51 Pro */
	{ USB_ID(0x041e, 0x3048), 2, 2, 6, 6,  2,  0x6e91 }, /* Toshiba SB0500 */
};

static