Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 1414 insertions, 0 deletions

diff --git a/sound/usb/mixer_us16x08.c b/sound/usb/mixer_us16x08.c
new file mode 100644
index 000000000..6eb7d93b3
--- /dev/null
+++ b/sound/usb/mixer_us16x08.c
@@ -0,0 +1,1414 @@
+// 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;
+}
+