linux/sound/usb/mixer_us16x08.c
Daniil Dementev 3ddbe35d9a ALSA: usb-audio: US16x08: Move overflow check before array access
Buffer overflow could occur in the loop "while", due to accessing an
array element before checking the index.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Daniil Dementev <d.dementev@ispras.ru>
Reviewed-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Link: https://lore.kernel.org/r/20220610165732.2904-1-d.dementev@ispras.ru
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-06-13 07:40:08 +02:00

1415 lines
37 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Tascam US-16x08 ALSA driver
*
* Copyright (c) 2016 by Detlef Urban (onkel@paraair.de)
*/
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/audio-v2.h>
#include <sound/core.h>
#include <sound/control.h>
#include "usbaudio.h"
#include "mixer.h"
#include "helper.h"
#include "mixer_us16x08.h"
/* USB control message templates */
static const char route_msg[] = {
0x61,
0x02,
0x03, /* input from master (0x02) or input from computer bus (0x03) */
0x62,
0x02,
0x01, /* input index (0x01/0x02 eq. left/right) or bus (0x01-0x08) */
0x41,
0x01,
0x61,
0x02,
0x01,
0x62,
0x02,
0x01, /* output index (0x01-0x08) */
0x42,
0x01,
0x43,
0x01,
0x00,
0x00
};
static const char mix_init_msg1[] = {
0x71, 0x01, 0x00, 0x00
};
static const char mix_init_msg2[] = {
0x62, 0x02, 0x00, 0x61, 0x02, 0x04, 0xb1, 0x01, 0x00, 0x00
};
static const char mix_msg_in[] = {
/* default message head, equal to all mixers */
0x61, 0x02, 0x04, 0x62, 0x02, 0x01,
0x81, /* 0x06: Controller ID */
0x02, /* 0x07: */
0x00, /* 0x08: Value of common mixer */
0x00,
0x00
};
static const char mix_msg_out[] = {
/* default message head, equal to all mixers */
0x61, 0x02, 0x02, 0x62, 0x02, 0x01,
0x81, /* 0x06: Controller ID */
0x02, /* 0x07: */
0x00, /* 0x08: Value of common mixer */
0x00,
0x00
};
static const char bypass_msg_out[] = {
0x45,
0x02,
0x01, /* on/off flag */
0x00,
0x00
};
static const char bus_msg_out[] = {
0x44,
0x02,
0x01, /* on/off flag */
0x00,
0x00
};
static const char comp_msg[] = {
/* default message head, equal to all mixers */
0x61, 0x02, 0x04, 0x62, 0x02, 0x01,
0x91,
0x02,
0xf0, /* 0x08: Threshold db (8) (e0 ... 00) (+-0dB -- -32dB) x-32 */
0x92,
0x02,
0x0a, /* 0x0b: Ratio (0a,0b,0d,0f,11,14,19,1e,23,28,32,3c,50,a0,ff) */
0x93,
0x02,
0x02, /* 0x0e: Attack (0x02 ... 0xc0) (2ms ... 200ms) */
0x94,
0x02,
0x01, /* 0x11: Release (0x01 ... 0x64) (10ms ... 1000ms) x*10 */
0x95,
0x02,
0x03, /* 0x14: gain (0 ... 20) (0dB .. 20dB) */
0x96,
0x02,
0x01,
0x97,
0x02,
0x01, /* 0x1a: main Comp switch (0 ... 1) (off ... on)) */
0x00,
0x00
};
static const char eqs_msq[] = {
/* default message head, equal to all mixers */
0x61, 0x02, 0x04, 0x62, 0x02, 0x01,
0x51, /* 0x06: Controller ID */
0x02,
0x04, /* 0x08: EQ set num (0x01..0x04) (LOW, LOWMID, HIGHMID, HIGH)) */
0x52,
0x02,
0x0c, /* 0x0b: value dB (0 ... 12) (-12db .. +12db) x-6 */
0x53,
0x02,
0x0f, /* 0x0e: value freq (32-47) (1.7kHz..18kHz) */
0x54,
0x02,
0x02, /* 0x11: band width (0-6) (Q16-Q0.25) 2^x/4 (EQ xxMID only) */
0x55,
0x02,
0x01, /* 0x14: main EQ switch (0 ... 1) (off ... on)) */
0x00,
0x00
};
/* compressor ratio map */
static const char ratio_map[] = {
0x0a, 0x0b, 0x0d, 0x0f, 0x11, 0x14, 0x19, 0x1e,
0x23, 0x28, 0x32, 0x3c, 0x50, 0xa0, 0xff
};
/* route enumeration names */
static const char *const route_names[] = {
"Master Left", "Master Right", "Output 1", "Output 2", "Output 3",
"Output 4", "Output 5", "Output 6", "Output 7", "Output 8",
};
static int snd_us16x08_recv_urb(struct snd_usb_audio *chip,
unsigned char *buf, int size)
{
mutex_lock(&chip->mutex);
snd_usb_ctl_msg(chip->dev,
usb_rcvctrlpipe(chip->dev, 0),
SND_US16X08_URB_METER_REQUEST,
SND_US16X08_URB_METER_REQUESTTYPE, 0, 0, buf, size);
mutex_unlock(&chip->mutex);
return 0;
}
/* wrapper function to send prepared URB buffer to usb device. Return an error
* code if something went wrong
*/
static int snd_us16x08_send_urb(struct snd_usb_audio *chip, char *buf, int size)
{
return snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
SND_US16X08_URB_REQUEST, SND_US16X08_URB_REQUESTTYPE,
0, 0, buf, size);
}
static int snd_us16x08_route_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
return snd_ctl_enum_info(uinfo, 1, 10, route_names);
}
static int snd_us16x08_route_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
int index = ucontrol->id.index;
/* route has no bias */
ucontrol->value.enumerated.item[0] = elem->cache_val[index];
return 0;
}
static int snd_us16x08_route_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_usb_audio *chip = elem->head.mixer->chip;
int index = ucontrol->id.index;
char buf[sizeof(route_msg)];
int val, val_org, err;
/* get the new value (no bias for routes) */
val = ucontrol->value.enumerated.item[0];
/* sanity check */
if (val < 0 || val > 9)
return -EINVAL;
/* prepare the message buffer from template */
memcpy(buf, route_msg, sizeof(route_msg));
if (val < 2) {
/* input comes from a master channel */
val_org = val;
buf[2] = 0x02;
} else {
/* input comes from a computer channel */
buf[2] = 0x03;
val_org = val - 2;
}
/* place new route selection in URB message */
buf[5] = (unsigned char) (val_org & 0x0f) + 1;
/* place route selector in URB message */
buf[13] = index + 1;
err = snd_us16x08_send_urb(chip, buf, sizeof(route_msg));
if (err > 0) {
elem->cached |= 1 << index;
elem->cache_val[index] = val;
} else {
usb_audio_dbg(chip, "Failed to set routing, err:%d\n", err);
}
return err > 0 ? 1 : 0;
}
static int snd_us16x08_master_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->count = 1;
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->value.integer.max = SND_US16X08_KCMAX(kcontrol);
uinfo->value.integer.min = SND_US16X08_KCMIN(kcontrol);
uinfo->value.integer.step = SND_US16X08_KCSTEP(kcontrol);
return 0;
}
static int snd_us16x08_master_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
int index = ucontrol->id.index;
ucontrol->value.integer.value[0] = elem->cache_val[index];
return 0;
}
static int snd_us16x08_master_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_usb_audio *chip = elem->head.mixer->chip;
char buf[sizeof(mix_msg_out)];
int val, err;
int index = ucontrol->id.index;
/* new control value incl. bias*/
val = ucontrol->value.integer.value[0];
/* sanity check */
if (val < SND_US16X08_KCMIN(kcontrol)
|| val > SND_US16X08_KCMAX(kcontrol))
return -EINVAL;
/* prepare the message buffer from template */
memcpy(buf, mix_msg_out, sizeof(mix_msg_out));
buf[8] = val - SND_US16X08_KCBIAS(kcontrol);
buf[6] = elem->head.id;
/* place channel selector in URB message */
buf[5] = index + 1;
err = snd_us16x08_send_urb(chip, buf, sizeof(mix_msg_out));
if (err > 0) {
elem->cached |= 1 << index;
elem->cache_val[index] = val;
} else {
usb_audio_dbg(chip, "Failed to set master, err:%d\n", err);
}
return err > 0 ? 1 : 0;
}
static int snd_us16x08_bus_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_usb_audio *chip = elem->head.mixer->chip;
char buf[sizeof(mix_msg_out)];
int val, err = 0;
val = ucontrol->value.integer.value[0];
/* prepare the message buffer from template */
switch (elem->head.id) {
case SND_US16X08_ID_BYPASS:
memcpy(buf, bypass_msg_out, sizeof(bypass_msg_out));
buf[2] = val;
err = snd_us16x08_send_urb(chip, buf, sizeof(bypass_msg_out));
break;
case SND_US16X08_ID_BUSS_OUT:
memcpy(buf, bus_msg_out, sizeof(bus_msg_out));
buf[2] = val;
err = snd_us16x08_send_urb(chip, buf, sizeof(bus_msg_out));
break;
case SND_US16X08_ID_MUTE:
memcpy(buf, mix_msg_out, sizeof(mix_msg_out));
buf[8] = val;
buf[6] = elem->head.id;
buf[5] = 1;
err = snd_us16x08_send_urb(chip, buf, sizeof(mix_msg_out));
break;
}
if (err > 0) {
elem->cached |= 1;
elem->cache_val[0] = val;
} else {
usb_audio_dbg(chip, "Failed to set bus parameter, err:%d\n", err);
}
return err > 0 ? 1 : 0;
}
static int snd_us16x08_bus_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
switch (elem->head.id) {
case SND_US16X08_ID_BUSS_OUT:
ucontrol->value.integer.value[0] = elem->cache_val[0];
break;
case SND_US16X08_ID_BYPASS:
ucontrol->value.integer.value[0] = elem->cache_val[0];
break;
case SND_US16X08_ID_MUTE:
ucontrol->value.integer.value[0] = elem->cache_val[0];
break;
}
return 0;
}
/* gets a current mixer value from common store */
static int snd_us16x08_channel_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
int index = ucontrol->id.index;
ucontrol->value.integer.value[0] = elem->cache_val[index];
return 0;
}
static int snd_us16x08_channel_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_usb_audio *chip = elem->head.mixer->chip;
char buf[sizeof(mix_msg_in)];
int val, err;
int index = ucontrol->id.index;
val = ucontrol->value.integer.value[0];
/* sanity check */
if (val < SND_US16X08_KCMIN(kcontrol)
|| val > SND_US16X08_KCMAX(kcontrol))
return -EINVAL;
/* prepare URB message from template */
memcpy(buf, mix_msg_in, sizeof(mix_msg_in));
/* add the bias to the new value */
buf[8] = val - SND_US16X08_KCBIAS(kcontrol);
buf[6] = elem->head.id;
buf[5] = index + 1;
err = snd_us16x08_send_urb(chip, buf, sizeof(mix_msg_in));
if (err > 0) {
elem->cached |= 1 << index;
elem->cache_val[index] = val;
} else {
usb_audio_dbg(chip, "Failed to set channel, err:%d\n", err);
}
return err > 0 ? 1 : 0;
}
static int snd_us16x08_mix_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->count = 1;
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->value.integer.max = SND_US16X08_KCMAX(kcontrol);
uinfo->value.integer.min = SND_US16X08_KCMIN(kcontrol);
uinfo->value.integer.step = SND_US16X08_KCSTEP(kcontrol);
return 0;
}
static int snd_us16x08_comp_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_us16x08_comp_store *store = elem->private_data;
int index = ucontrol->id.index;
int val_idx = COMP_STORE_IDX(elem->head.id);
ucontrol->value.integer.value[0] = store->val[val_idx][index];
return 0;
}
static int snd_us16x08_comp_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_usb_audio *chip = elem->head.mixer->chip;
struct snd_us16x08_comp_store *store = elem->private_data;
int index = ucontrol->id.index;
char buf[sizeof(comp_msg)];
int val_idx, val;
int err;
val = ucontrol->value.integer.value[0];
/* sanity check */
if (val < SND_US16X08_KCMIN(kcontrol)
|| val > SND_US16X08_KCMAX(kcontrol))
return -EINVAL;
/* new control value incl. bias*/
val_idx = elem->head.id - SND_US16X08_ID_COMP_BASE;
store->val[val_idx][index] = ucontrol->value.integer.value[0];
/* prepare compressor URB message from template */
memcpy(buf, comp_msg, sizeof(comp_msg));
/* place comp values in message buffer watch bias! */
buf[8] = store->val[
COMP_STORE_IDX(SND_US16X08_ID_COMP_THRESHOLD)][index]
- SND_US16X08_COMP_THRESHOLD_BIAS;
buf[11] = ratio_map[store->val[
COMP_STORE_IDX(SND_US16X08_ID_COMP_RATIO)][index]];
buf[14] = store->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_ATTACK)][index]
+ SND_US16X08_COMP_ATTACK_BIAS;
buf[17] = store->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_RELEASE)][index]
+ SND_US16X08_COMP_RELEASE_BIAS;
buf[20] = store->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_GAIN)][index];
buf[26] = store->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_SWITCH)][index];
/* place channel selector in message buffer */
buf[5] = index + 1;
err = snd_us16x08_send_urb(chip, buf, sizeof(comp_msg));
if (err > 0) {
elem->cached |= 1 << index;
elem->cache_val[index] = val;
} else {
usb_audio_dbg(chip, "Failed to set compressor, err:%d\n", err);
}
return 1;
}
static int snd_us16x08_eqswitch_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
int val;
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_us16x08_eq_store *store = elem->private_data;
int index = ucontrol->id.index;
/* get low switch from cache is enough, cause all bands are together */
val = store->val[EQ_STORE_BAND_IDX(elem->head.id)]
[EQ_STORE_PARAM_IDX(elem->head.id)][index];
ucontrol->value.integer.value[0] = val;
return 0;
}
static int snd_us16x08_eqswitch_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_usb_audio *chip = elem->head.mixer->chip;
struct snd_us16x08_eq_store *store = elem->private_data;
int index = ucontrol->id.index;
char buf[sizeof(eqs_msq)];
int val, err = 0;
int b_idx;
/* new control value incl. bias*/
val = ucontrol->value.integer.value[0] + SND_US16X08_KCBIAS(kcontrol);
/* prepare URB message from EQ template */
memcpy(buf, eqs_msq, sizeof(eqs_msq));
/* place channel index in URB message */
buf[5] = index + 1;
for (b_idx = 0; b_idx < SND_US16X08_ID_EQ_BAND_COUNT; b_idx++) {
/* all four EQ bands have to be enabled/disabled in once */
buf[20] = val;
buf[17] = store->val[b_idx][2][index];
buf[14] = store->val[b_idx][1][index];
buf[11] = store->val[b_idx][0][index];
buf[8] = b_idx + 1;
err = snd_us16x08_send_urb(chip, buf, sizeof(eqs_msq));
if (err < 0)
break;
store->val[b_idx][3][index] = val;
msleep(15);
}
if (err > 0) {
elem->cached |= 1 << index;
elem->cache_val[index] = val;
} else {
usb_audio_dbg(chip, "Failed to set eq switch, err:%d\n", err);
}
return 1;
}
static int snd_us16x08_eq_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
int val;
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_us16x08_eq_store *store = elem->private_data;
int index = ucontrol->id.index;
int b_idx = EQ_STORE_BAND_IDX(elem->head.id) - 1;
int p_idx = EQ_STORE_PARAM_IDX(elem->head.id);
val = store->val[b_idx][p_idx][index];
ucontrol->value.integer.value[0] = val;
return 0;
}
static int snd_us16x08_eq_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_usb_audio *chip = elem->head.mixer->chip;
struct snd_us16x08_eq_store *store = elem->private_data;
int index = ucontrol->id.index;
char buf[sizeof(eqs_msq)];
int val, err;
int b_idx = EQ_STORE_BAND_IDX(elem->head.id) - 1;
int p_idx = EQ_STORE_PARAM_IDX(elem->head.id);
val = ucontrol->value.integer.value[0];
/* sanity check */
if (val < SND_US16X08_KCMIN(kcontrol)
|| val > SND_US16X08_KCMAX(kcontrol))
return -EINVAL;
/* copy URB buffer from EQ template */
memcpy(buf, eqs_msq, sizeof(eqs_msq));
store->val[b_idx][p_idx][index] = val;
buf[20] = store->val[b_idx][3][index];
buf[17] = store->val[b_idx][2][index];
buf[14] = store->val[b_idx][1][index];
buf[11] = store->val[b_idx][0][index];
/* place channel index in URB buffer */
buf[5] = index + 1;
/* place EQ band in URB buffer */
buf[8] = b_idx + 1;
err = snd_us16x08_send_urb(chip, buf, sizeof(eqs_msq));
if (err > 0) {
/* store new value in EQ band cache */
elem->cached |= 1 << index;
elem->cache_val[index] = val;
} else {
usb_audio_dbg(chip, "Failed to set eq param, err:%d\n", err);
}
return 1;
}
static int snd_us16x08_meter_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->count = 34;
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->value.integer.max = 0x7FFF;
uinfo->value.integer.min = 0;
return 0;
}
/* calculate compressor index for reduction level request */
static int snd_get_meter_comp_index(struct snd_us16x08_meter_store *store)
{
int ret;
/* any channel active */
if (store->comp_active_index) {
/* check for stereo link */
if (store->comp_active_index & 0x20) {
/* reset comp_index to left channel*/
if (store->comp_index -
store->comp_active_index > 1)
store->comp_index =
store->comp_active_index;
ret = store->comp_index++ & 0x1F;
} else {
/* no stereo link */
ret = store->comp_active_index;
}
} else {
/* skip channels with no compressor active */
while (store->comp_index <= SND_US16X08_MAX_CHANNELS
&& !store->comp_store->val[
COMP_STORE_IDX(SND_US16X08_ID_COMP_SWITCH)]
[store->comp_index - 1]) {
store->comp_index++;
}
ret = store->comp_index++;
if (store->comp_index > SND_US16X08_MAX_CHANNELS)
store->comp_index = 1;
}
return ret;
}
/* retrieve the meter level values from URB message */
static void get_meter_levels_from_urb(int s,
struct snd_us16x08_meter_store *store,
u8 *meter_urb)
{
int val = MUC2(meter_urb, s) + (MUC3(meter_urb, s) << 8);
if (MUA0(meter_urb, s) == 0x61 && MUA1(meter_urb, s) == 0x02 &&
MUA2(meter_urb, s) == 0x04 && MUB0(meter_urb, s) == 0x62) {
if (MUC0(meter_urb, s) == 0x72)
store->meter_level[MUB2(meter_urb, s) - 1] = val;
if (MUC0(meter_urb, s) == 0xb2)
store->comp_level[MUB2(meter_urb, s) - 1] = val;
}
if (MUA0(meter_urb, s) == 0x61 && MUA1(meter_urb, s) == 0x02 &&
MUA2(meter_urb, s) == 0x02 && MUB0(meter_urb, s) == 0x62)
store->master_level[MUB2(meter_urb, s) - 1] = val;
}
/* Function to retrieve current meter values from the device.
*
* The device needs to be polled for meter values with an initial
* requests. It will return with a sequence of different meter value
* packages. The first request (case 0:) initiate this meter response sequence.
* After the third response, an additional request can be placed,
* to retrieve compressor reduction level value for given channel. This round
* trip channel selector will skip all inactive compressors.
* A mixer can interrupt this round-trip by selecting one ore two (stereo-link)
* specific channels.
*/
static int snd_us16x08_meter_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
int i, set;
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_usb_audio *chip = elem->head.mixer->chip;
struct snd_us16x08_meter_store *store = elem->private_data;
u8 meter_urb[64];
switch (kcontrol->private_value) {
case 0: {
char tmp[sizeof(mix_init_msg1)];
memcpy(tmp, mix_init_msg1, sizeof(mix_init_msg1));
snd_us16x08_send_urb(chip, tmp, 4);
snd_us16x08_recv_urb(chip, meter_urb,
sizeof(meter_urb));
kcontrol->private_value++;
break;
}
case 1:
snd_us16x08_recv_urb(chip, meter_urb,
sizeof(meter_urb));
kcontrol->private_value++;
break;
case 2:
snd_us16x08_recv_urb(chip, meter_urb,
sizeof(meter_urb));
kcontrol->private_value++;
break;
case 3: {
char tmp[sizeof(mix_init_msg2)];
memcpy(tmp, mix_init_msg2, sizeof(mix_init_msg2));
tmp[2] = snd_get_meter_comp_index(store);
snd_us16x08_send_urb(chip, tmp, 10);
snd_us16x08_recv_urb(chip, meter_urb,
sizeof(meter_urb));
kcontrol->private_value = 0;
break;
}
}
for (set = 0; set < 6; set++)
get_meter_levels_from_urb(set, store, meter_urb);
for (i = 0; i < SND_US16X08_MAX_CHANNELS; i++) {
ucontrol->value.integer.value[i] =
store ? store->meter_level[i] : 0;
}
ucontrol->value.integer.value[i++] = store ? store->master_level[0] : 0;
ucontrol->value.integer.value[i++] = store ? store->master_level[1] : 0;
for (i = 2; i < SND_US16X08_MAX_CHANNELS + 2; i++)
ucontrol->value.integer.value[i + SND_US16X08_MAX_CHANNELS] =
store ? store->comp_level[i - 2] : 0;
return 1;
}
static int snd_us16x08_meter_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kcontrol->private_data;
struct snd_us16x08_meter_store *store = elem->private_data;
int val;
val = ucontrol->value.integer.value[0];
/* sanity check */
if (val < 0 || val >= SND_US16X08_MAX_CHANNELS)
return -EINVAL;
store->comp_active_index = val;
store->comp_index = val;
return 1;
}
static const struct snd_kcontrol_new snd_us16x08_ch_boolean_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_switch_info,
.get = snd_us16x08_channel_get,
.put = snd_us16x08_channel_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 1)
};
static const struct snd_kcontrol_new snd_us16x08_ch_int_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_channel_get,
.put = snd_us16x08_channel_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_FADER_BIAS, 1, 0, 133)
};
static const struct snd_kcontrol_new snd_us16x08_pan_int_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_channel_get,
.put = snd_us16x08_channel_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_FADER_BIAS, 1, 0, 255)
};
static const struct snd_kcontrol_new snd_us16x08_master_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 1,
.info = snd_us16x08_master_info,
.get = snd_us16x08_master_get,
.put = snd_us16x08_master_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_FADER_BIAS, 1, 0, 133)
};
static const struct snd_kcontrol_new snd_us16x08_route_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 8,
.info = snd_us16x08_route_info,
.get = snd_us16x08_route_get,
.put = snd_us16x08_route_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 9)
};
static const struct snd_kcontrol_new snd_us16x08_bus_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 1,
.info = snd_us16x08_switch_info,
.get = snd_us16x08_bus_get,
.put = snd_us16x08_bus_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 1)
};
static const struct snd_kcontrol_new snd_us16x08_compswitch_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_switch_info,
.get = snd_us16x08_comp_get,
.put = snd_us16x08_comp_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 1)
};
static const struct snd_kcontrol_new snd_us16x08_comp_threshold_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_comp_get,
.put = snd_us16x08_comp_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_COMP_THRESHOLD_BIAS, 1,
0, 0x20)
};
static const struct snd_kcontrol_new snd_us16x08_comp_ratio_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_comp_get,
.put = snd_us16x08_comp_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0,
sizeof(ratio_map) - 1), /*max*/
};
static const struct snd_kcontrol_new snd_us16x08_comp_gain_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_comp_get,
.put = snd_us16x08_comp_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 0x14)
};
static const struct snd_kcontrol_new snd_us16x08_comp_attack_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_comp_get,
.put = snd_us16x08_comp_put,
.private_value =
SND_US16X08_KCSET(SND_US16X08_COMP_ATTACK_BIAS, 1, 0, 0xc6),
};
static const struct snd_kcontrol_new snd_us16x08_comp_release_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_comp_get,
.put = snd_us16x08_comp_put,
.private_value =
SND_US16X08_KCSET(SND_US16X08_COMP_RELEASE_BIAS, 1, 0, 0x63),
};
static const struct snd_kcontrol_new snd_us16x08_eq_gain_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_eq_get,
.put = snd_us16x08_eq_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 24),
};
static const struct snd_kcontrol_new snd_us16x08_eq_low_freq_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_eq_get,
.put = snd_us16x08_eq_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 0x1F),
};
static const struct snd_kcontrol_new snd_us16x08_eq_mid_freq_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_eq_get,
.put = snd_us16x08_eq_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 0x3F)
};
static const struct snd_kcontrol_new snd_us16x08_eq_mid_width_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_eq_get,
.put = snd_us16x08_eq_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 0x06)
};
static const struct snd_kcontrol_new snd_us16x08_eq_high_freq_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_mix_info,
.get = snd_us16x08_eq_get,
.put = snd_us16x08_eq_put,
.private_value =
SND_US16X08_KCSET(SND_US16X08_EQ_HIGHFREQ_BIAS, 1, 0, 0x1F)
};
static const struct snd_kcontrol_new snd_us16x08_eq_switch_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 16,
.info = snd_us16x08_switch_info,
.get = snd_us16x08_eqswitch_get,
.put = snd_us16x08_eqswitch_put,
.private_value = SND_US16X08_KCSET(SND_US16X08_NO_BIAS, 1, 0, 1)
};
static const struct snd_kcontrol_new snd_us16x08_meter_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.count = 1,
.info = snd_us16x08_meter_info,
.get = snd_us16x08_meter_get,
.put = snd_us16x08_meter_put
};
/* control store preparation */
/* setup compressor store and assign default value */
static struct snd_us16x08_comp_store *snd_us16x08_create_comp_store(void)
{
int i;
struct snd_us16x08_comp_store *tmp;
tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
return NULL;
for (i = 0; i < SND_US16X08_MAX_CHANNELS; i++) {
tmp->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_THRESHOLD)][i]
= 0x20;
tmp->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_RATIO)][i] = 0x00;
tmp->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_GAIN)][i] = 0x00;
tmp->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_SWITCH)][i] = 0x00;
tmp->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_ATTACK)][i] = 0x00;
tmp->val[COMP_STORE_IDX(SND_US16X08_ID_COMP_RELEASE)][i] = 0x00;
}
return tmp;
}
/* setup EQ store and assign default values */
static struct snd_us16x08_eq_store *snd_us16x08_create_eq_store(void)
{
int i, b_idx;
struct snd_us16x08_eq_store *tmp;
tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
return NULL;
for (i = 0; i < SND_US16X08_MAX_CHANNELS; i++) {
for (b_idx = 0; b_idx < SND_US16X08_ID_EQ_BAND_COUNT; b_idx++) {
tmp->val[b_idx][0][i] = 0x0c;
tmp->val[b_idx][3][i] = 0x00;
switch (b_idx) {
case 0: /* EQ Low */
tmp->val[b_idx][1][i] = 0x05;
tmp->val[b_idx][2][i] = 0xff;
break;
case 1: /* EQ Mid low */
tmp->val[b_idx][1][i] = 0x0e;
tmp->val[b_idx][2][i] = 0x02;
break;
case 2: /* EQ Mid High */
tmp->val[b_idx][1][i] = 0x1b;
tmp->val[b_idx][2][i] = 0x02;
break;
case 3: /* EQ High */
tmp->val[b_idx][1][i] = 0x2f
- SND_US16X08_EQ_HIGHFREQ_BIAS;
tmp->val[b_idx][2][i] = 0xff;
break;
}
}
}
return tmp;
}
static struct snd_us16x08_meter_store *snd_us16x08_create_meter_store(void)
{
struct snd_us16x08_meter_store *tmp;
tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
return NULL;
tmp->comp_index = 1;
tmp->comp_active_index = 0;
return tmp;
}
/* release elem->private_free as well; called only once for each *_store */
static void elem_private_free(struct snd_kcontrol *kctl)
{
struct usb_mixer_elem_info *elem = kctl->private_data;
if (elem)
kfree(elem->private_data);
kfree(elem);
kctl->private_data = NULL;
}
static int add_new_ctl(struct usb_mixer_interface *mixer,
const struct snd_kcontrol_new *ncontrol,
int index, int val_type, int channels,
const char *name, void *opt,
bool do_private_free,
struct usb_mixer_elem_info **elem_ret)
{
struct snd_kcontrol *kctl;
struct usb_mixer_elem_info *elem;
int err;
usb_audio_dbg(mixer->chip, "us16x08 add mixer %s\n", name);
elem = kzalloc(sizeof(*elem), GFP_KERNEL);
if (!elem)
return -ENOMEM;
elem->head.mixer = mixer;
elem->head.resume = NULL;
elem->control = 0;
elem->idx_off = 0;
elem->head.id = index;
elem->val_type = val_type;
elem->channels = channels;
elem->private_data = opt;
kctl = snd_ctl_new1(ncontrol, elem);
if (!kctl) {
kfree(elem);
return -ENOMEM;
}
if (do_private_free)
kctl->private_free = elem_private_free;
else
kctl->private_free = snd_usb_mixer_elem_free;
strscpy(kctl->id.name, name, sizeof(kctl->id.name));
err = snd_usb_mixer_add_control(&elem->head, kctl);
if (err < 0)
return err;
if (elem_ret)
*elem_ret = elem;
return 0;
}
/* table of EQ controls */
static const struct snd_us16x08_control_params eq_controls[] = {
{ /* EQ switch */
.kcontrol_new = &snd_us16x08_eq_switch_ctl,
.control_id = SND_US16X08_ID_EQENABLE,
.type = USB_MIXER_BOOLEAN,
.num_channels = 16,
.name = "EQ Switch",
},
{ /* EQ low gain */
.kcontrol_new = &snd_us16x08_eq_gain_ctl,
.control_id = SND_US16X08_ID_EQLOWLEVEL,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ Low Volume",
},
{ /* EQ low freq */
.kcontrol_new = &snd_us16x08_eq_low_freq_ctl,
.control_id = SND_US16X08_ID_EQLOWFREQ,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ Low Frequency",
},
{ /* EQ mid low gain */
.kcontrol_new = &snd_us16x08_eq_gain_ctl,
.control_id = SND_US16X08_ID_EQLOWMIDLEVEL,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ MidLow Volume",
},
{ /* EQ mid low freq */
.kcontrol_new = &snd_us16x08_eq_mid_freq_ctl,
.control_id = SND_US16X08_ID_EQLOWMIDFREQ,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ MidLow Frequency",
},
{ /* EQ mid low Q */
.kcontrol_new = &snd_us16x08_eq_mid_width_ctl,
.control_id = SND_US16X08_ID_EQLOWMIDWIDTH,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ MidLow Q",
},
{ /* EQ mid high gain */
.kcontrol_new = &snd_us16x08_eq_gain_ctl,
.control_id = SND_US16X08_ID_EQHIGHMIDLEVEL,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ MidHigh Volume",
},
{ /* EQ mid high freq */
.kcontrol_new = &snd_us16x08_eq_mid_freq_ctl,
.control_id = SND_US16X08_ID_EQHIGHMIDFREQ,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ MidHigh Frequency",
},
{ /* EQ mid high Q */
.kcontrol_new = &snd_us16x08_eq_mid_width_ctl,
.control_id = SND_US16X08_ID_EQHIGHMIDWIDTH,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ MidHigh Q",
},
{ /* EQ high gain */
.kcontrol_new = &snd_us16x08_eq_gain_ctl,
.control_id = SND_US16X08_ID_EQHIGHLEVEL,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ High Volume",
},
{ /* EQ low freq */
.kcontrol_new = &snd_us16x08_eq_high_freq_ctl,
.control_id = SND_US16X08_ID_EQHIGHFREQ,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "EQ High Frequency",
},
};
/* table of compressor controls */
static const struct snd_us16x08_control_params comp_controls[] = {
{ /* Comp enable */
.kcontrol_new = &snd_us16x08_compswitch_ctl,
.control_id = SND_US16X08_ID_COMP_SWITCH,
.type = USB_MIXER_BOOLEAN,
.num_channels = 16,
.name = "Compressor Switch",
},
{ /* Comp threshold */
.kcontrol_new = &snd_us16x08_comp_threshold_ctl,
.control_id = SND_US16X08_ID_COMP_THRESHOLD,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "Compressor Threshold Volume",
},
{ /* Comp ratio */
.kcontrol_new = &snd_us16x08_comp_ratio_ctl,
.control_id = SND_US16X08_ID_COMP_RATIO,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "Compressor Ratio",
},
{ /* Comp attack */
.kcontrol_new = &snd_us16x08_comp_attack_ctl,
.control_id = SND_US16X08_ID_COMP_ATTACK,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "Compressor Attack",
},
{ /* Comp release */
.kcontrol_new = &snd_us16x08_comp_release_ctl,
.control_id = SND_US16X08_ID_COMP_RELEASE,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "Compressor Release",
},
{ /* Comp gain */
.kcontrol_new = &snd_us16x08_comp_gain_ctl,
.control_id = SND_US16X08_ID_COMP_GAIN,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "Compressor Volume",
},
};
/* table of channel controls */
static const struct snd_us16x08_control_params channel_controls[] = {
{ /* Phase */
.kcontrol_new = &snd_us16x08_ch_boolean_ctl,
.control_id = SND_US16X08_ID_PHASE,
.type = USB_MIXER_BOOLEAN,
.num_channels = 16,
.name = "Phase Switch",
.default_val = 0
},
{ /* Fader */
.kcontrol_new = &snd_us16x08_ch_int_ctl,
.control_id = SND_US16X08_ID_FADER,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "Line Volume",
.default_val = 127
},
{ /* Mute */
.kcontrol_new = &snd_us16x08_ch_boolean_ctl,
.control_id = SND_US16X08_ID_MUTE,
.type = USB_MIXER_BOOLEAN,
.num_channels = 16,
.name = "Mute Switch",
.default_val = 0
},
{ /* Pan */
.kcontrol_new = &snd_us16x08_pan_int_ctl,
.control_id = SND_US16X08_ID_PAN,
.type = USB_MIXER_U16,
.num_channels = 16,
.name = "Pan Left-Right Volume",
.default_val = 127
},
};
/* table of master controls */
static const struct snd_us16x08_control_params master_controls[] = {
{ /* Master */
.kcontrol_new = &snd_us16x08_master_ctl,
.control_id = SND_US16X08_ID_FADER,
.type = USB_MIXER_U8,
.num_channels = 16,
.name = "Master Volume",
.default_val = 127
},
{ /* Bypass */
.kcontrol_new = &snd_us16x08_bus_ctl,
.control_id = SND_US16X08_ID_BYPASS,
.type = USB_MIXER_BOOLEAN,
.num_channels = 16,
.name = "DSP Bypass Switch",
.default_val = 0
},
{ /* Buss out */
.kcontrol_new = &snd_us16x08_bus_ctl,
.control_id = SND_US16X08_ID_BUSS_OUT,
.type = USB_MIXER_BOOLEAN,
.num_channels = 16,
.name = "Buss Out Switch",
.default_val = 0
},
{ /* Master mute */
.kcontrol_new = &snd_us16x08_bus_ctl,
.control_id = SND_US16X08_ID_MUTE,
.type = USB_MIXER_BOOLEAN,
.num_channels = 16,
.name = "Master Mute Switch",
.default_val = 0
},
};
int snd_us16x08_controls_create(struct usb_mixer_interface *mixer)
{
int i, j;
int err;
struct usb_mixer_elem_info *elem;
struct snd_us16x08_comp_store *comp_store;
struct snd_us16x08_meter_store *meter_store;
struct snd_us16x08_eq_store *eq_store;
/* just check for non-MIDI interface */
if (mixer->hostif->desc.bInterfaceNumber == 3) {
/* add routing control */
err = add_new_ctl(mixer, &snd_us16x08_route_ctl,
SND_US16X08_ID_ROUTE, USB_MIXER_U8, 8, "Line Out Route",
NULL, false, &elem);
if (err < 0) {
usb_audio_dbg(mixer->chip,
"Failed to create route control, err:%d\n",
err);
return err;
}
for (i = 0; i < 8; i++)
elem->cache_val[i] = i < 2 ? i : i + 2;
elem->cached = 0xff;
/* create compressor mixer elements */
comp_store = snd_us16x08_create_comp_store();
if (!comp_store)
return -ENOMEM;
/* add master controls */
for (i = 0; i < ARRAY_SIZE(master_controls); i++) {
err = add_new_ctl(mixer,
master_controls[i].kcontrol_new,
master_controls[i].control_id,
master_controls[i].type,
master_controls[i].num_channels,
master_controls[i].name,
comp_store,
i == 0, /* release comp_store only once */
&elem);
if (err < 0)
return err;
elem->cache_val[0] = master_controls[i].default_val;
elem->cached = 1;
}
/* add channel controls */
for (i = 0; i < ARRAY_SIZE(channel_controls); i++) {
err = add_new_ctl(mixer,
channel_controls[i].kcontrol_new,
channel_controls[i].control_id,
channel_controls[i].type,
channel_controls[i].num_channels,
channel_controls[i].name,
comp_store,
false, &elem);
if (err < 0)
return err;
for (j = 0; j < SND_US16X08_MAX_CHANNELS; j++) {
elem->cache_val[j] =
channel_controls[i].default_val;
}
elem->cached = 0xffff;
}
/* create eq store */
eq_store = snd_us16x08_create_eq_store();
if (!eq_store)
return -ENOMEM;
/* add EQ controls */
for (i = 0; i < ARRAY_SIZE(eq_controls); i++) {
err = add_new_ctl(mixer,
eq_controls[i].kcontrol_new,
eq_controls[i].control_id,
eq_controls[i].type,
eq_controls[i].num_channels,
eq_controls[i].name,
eq_store,
i == 0, /* release eq_store only once */
NULL);
if (err < 0)
return err;
}
/* add compressor controls */
for (i = 0; i < ARRAY_SIZE(comp_controls); i++) {
err = add_new_ctl(mixer,
comp_controls[i].kcontrol_new,
comp_controls[i].control_id,
comp_controls[i].type,
comp_controls[i].num_channels,
comp_controls[i].name,
comp_store,
false, NULL);
if (err < 0)
return err;
}
/* create meters store */
meter_store = snd_us16x08_create_meter_store();
if (!meter_store)
return -ENOMEM;
/* meter function 'get' must access to compressor store
* so place a reference here
*/
meter_store->comp_store = comp_store;
err = add_new_ctl(mixer, &snd_us16x08_meter_ctl,
SND_US16X08_ID_METER, USB_MIXER_U16, 0, "Level Meter",
meter_store, true, NULL);
if (err < 0)
return err;
}
return 0;
}