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, 467 insertions, 0 deletions

diff --git a/sound/firewire/motu/motu-protocol-v1.c b/sound/firewire/motu/motu-protocol-v1.c
new file mode 100644
index 000000000..e811629f1
--- /dev/null
+++ b/sound/firewire/motu/motu-protocol-v1.c
@@ -0,0 +1,467 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// motu-protocol-v1.c - a part of driver for MOTU FireWire series
+//
+// Copyright (c) 2021 Takashi Sakamoto <o-takashi@sakamocchi.jp>
+
+#include "motu.h"
+
+#include <linux/delay.h>
+
+// Status register for MOTU 828 (0x'ffff'f000'0b00).
+//
+// 0xffff0000: ISOC_COMM_CONTROL_MASK in motu-stream.c.
+// 0x00008000: mode of optical input interface.
+//   0x00008000: for S/PDIF signal.
+//   0x00000000: disabled or for ADAT signal.
+// 0x00004000: mode of optical output interface.
+//   0x00004000: for S/PDIF signal.
+//   0x00000000: disabled or for ADAT signal.
+// 0x00003f00: monitor input mode.
+//   0x00000800: analog-1/2
+//   0x00001a00: analog-3/4
+//   0x00002c00: analog-5/6
+//   0x00003e00: analog-7/8
+//   0x00000000: analog-1
+//   0x00000900: analog-2
+//   0x00001200: analog-3
+//   0x00001b00: analog-4
+//   0x00002400: analog-5
+//   0x00002d00: analog-6
+//   0x00003600: analog-7
+//   0x00003f00: analog-8
+// 0x00000080: enable stream input.
+// 0x00000040: disable monitor input.
+// 0x00000008: enable main out.
+// 0x00000004: rate of sampling clock.
+//   0x00000004: 48.0 kHz
+//   0x00000000: 44.1 kHz
+// 0x00000023: source of sampling clock.
+//   0x00000003: source packet header (SPH)
+//   0x00000002: S/PDIF on optical/coaxial interface.
+//   0x00000021: ADAT on optical interface
+//   0x00000001: ADAT on Dsub 9pin
+//   0x00000000: internal
+
+#define CLK_828_STATUS_OFFSET				0x0b00
+#define  CLK_828_STATUS_MASK				0x0000ffff
+#define  CLK_828_STATUS_FLAG_OPT_IN_IFACE_IS_SPDIF	0x00008000
+#define  CLK_828_STATUS_FLAG_OPT_OUT_IFACE_IS_SPDIF	0x00004000
+#define  CLK_828_STATUS_FLAG_FETCH_PCM_FRAMES		0x00000080
+#define  CLK_828_STATUS_FLAG_ENABLE_OUTPUT		0x00000008
+#define  CLK_828_STATUS_FLAG_RATE_48000			0x00000004
+#define  CLK_828_STATUS_MASK_SRC			0x00000023
+#define   CLK_828_STATUS_FLAG_SRC_ADAT_ON_OPT		0x00000021
+#define   CLK_828_STATUS_FLAG_SRC_SPH			0x00000003
+#define   CLK_828_STATUS_FLAG_SRC_SPDIF			0x00000002
+#define   CLK_828_STATUS_FLAG_SRC_ADAT_ON_DSUB		0x00000001
+#define   CLK_828_STATUS_FLAG_SRC_INTERNAL		0x00000000
+
+// Status register for MOTU 896 (0x'ffff'f000'0b14).
+//
+// 0xf0000000: enable physical and stream input to DAC.
+//   0x80000000: disable
+//   0x40000000: disable
+//   0x20000000: enable (prior to the other bits)
+//   0x10000000: disable
+//   0x00000000: disable
+// 0x08000000: speed of word clock signal output on BNC interface.
+//   0x00000000: force to low rate (44.1/48.0 kHz).
+//   0x08000000: follow to system clock.
+// 0x04000000: something relevant to clock.
+// 0x03000000: enable output.
+//  0x02000000: enabled irreversibly once standing unless the device voluntarily disables it.
+//  0x01000000: enabled irreversibly once standing unless the device voluntarily disables it.
+// 0x00ffff00: monitor input mode.
+//   0x00000000: disabled
+//   0x00004800: analog-1/2
+//   0x00005a00: analog-3/4
+//   0x00006c00: analog-5/6
+//   0x00007e00: analog-7/8
+//   0x00104800: AES/EBU-1/2
+//   0x00004000: analog-1
+//   0x00004900: analog-2
+//   0x00005200: analog-3
+//   0x00005b00: analog-4
+//   0x00006400: analog-5
+//   0x00006d00: analog-6
+//   0x00007600: analog-7
+//   0x00007f00: analog-8
+//   0x00104000: AES/EBU-1
+//   0x00104900: AES/EBU-2
+// 0x00000060: sample rate conversion for AES/EBU input/output.
+//   0x00000000: None
+//   0x00000020: input signal is converted to system rate
+//   0x00000040: output is slave to input, ignoring system rate
+//   0x00000060: output is double rate than system rate
+// 0x00000018: nominal rate of sampling clock.
+//   0x00000000: 44.1 kHz
+//   0x00000008: 48.0 kHz
+//   0x00000010: 88.2 kHz
+//   0x00000018: 96.0 kHz
+// 0x00000007: source of sampling clock.
+//   0x00000000: internal
+//   0x00000001: ADAT on optical interface
+//   0x00000002: AES/EBU on XLR
+//   0x00000003: source packet header (SPH)
+//   0x00000004: word clock on BNC
+//   0x00000005: ADAT on Dsub 9pin
+
+#define CLK_896_STATUS_OFFSET			0x0b14
+#define  CLK_896_STATUS_FLAG_FETCH_ENABLE	0x20000000
+#define  CLK_896_STATUS_FLAG_OUTPUT_ON		0x03000000
+#define  CLK_896_STATUS_MASK_SRC		0x00000007
+#define   CLK_896_STATUS_FLAG_SRC_INTERNAL	0x00000000
+#define   CLK_896_STATUS_FLAG_SRC_ADAT_ON_OPT	0x00000001
+#define   CLK_896_STATUS_FLAG_SRC_AESEBU	0x00000002
+#define   CLK_896_STATUS_FLAG_SRC_SPH		0x00000003
+#define   CLK_896_STATUS_FLAG_SRC_WORD		0x00000004
+#define   CLK_896_STATUS_FLAG_SRC_ADAT_ON_DSUB	0x00000005
+#define  CLK_896_STATUS_MASK_RATE		0x00000018
+#define   CLK_896_STATUS_FLAG_RATE_44100	0x00000000
+#define   CLK_896_STATUS_FLAG_RATE_48000	0x00000008
+#define   CLK_896_STATUS_FLAG_RATE_88200	0x00000010
+#define   CLK_896_STATUS_FLAG_RATE_96000	0x00000018
+
+static void parse_clock_rate_828(u32 data, unsigned int *rate)
+{
+	if (data & CLK_828_STATUS_FLAG_RATE_48000)
+		*rate = 48000;
+	else
+		*rate = 44100;
+}
+
+static int get_clock_rate_828(struct snd_motu *motu, unsigned int *rate)
+{
+	__be32 reg;
+	int err;
+
+	err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, &reg, sizeof(reg));
+	if (err < 0)
+		return err;
+	parse_clock_rate_828(be32_to_cpu(reg), rate);
+
+	return 0;
+}
+
+static int parse_clock_rate_896(u32 data, unsigned int *rate)
+{
+	switch (data & CLK_896_STATUS_MASK_RATE) {
+	case CLK_896_STATUS_FLAG_RATE_44100:
+		*rate = 44100;
+		break;
+	case CLK_896_STATUS_FLAG_RATE_48000:
+		*rate = 48000;
+		break;
+	case CLK_896_STATUS_FLAG_RATE_88200:
+		*rate = 88200;
+		break;
+	case CLK_896_STATUS_FLAG_RATE_96000:
+		*rate = 96000;
+		break;
+	default:
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int get_clock_rate_896(struct snd_motu *motu, unsigned int *rate)
+{
+	__be32 reg;
+	int err;
+
+	err = snd_motu_transaction_read(motu, CLK_896_STATUS_OFFSET, &reg, sizeof(reg));
+	if (err < 0)
+		return err;
+	return parse_clock_rate_896(be32_to_cpu(reg), rate);
+}
+
+int snd_motu_protocol_v1_get_clock_rate(struct snd_motu *motu, unsigned int *rate)
+{
+	if (motu->spec == &snd_motu_spec_828)
+		return get_clock_rate_828(motu, rate);
+	else if (motu->spec == &snd_motu_spec_896)
+		return get_clock_rate_896(motu, rate);
+	else
+		return -ENXIO;
+}
+
+static int set_clock_rate_828(struct snd_motu *motu, unsigned int rate)
+{
+	__be32 reg;
+	u32 data;
+	int err;
+
+	err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, &reg, sizeof(reg));
+	if (err < 0)
+		return err;
+	data = be32_to_cpu(reg) & CLK_828_STATUS_MASK;
+
+	data &= ~CLK_828_STATUS_FLAG_RATE_48000;
+	if (rate == 48000)
+		data |= CLK_828_STATUS_FLAG_RATE_48000;
+
+	reg = cpu_to_be32(data);
+	return snd_motu_transaction_write(motu, CLK_828_STATUS_OFFSET, &reg, sizeof(reg));
+}
+
+static int set_clock_rate_896(struct snd_motu *motu, unsigned int rate)
+{
+	unsigned int flag;
+	__be32 reg;
+	u32 data;
+	int err;
+
+	err = snd_motu_transaction_read(motu, CLK_896_STATUS_OFFSET, &reg, sizeof(reg));
+	if (err < 0)
+		return err;
+	data = be32_to_cpu(reg);
+
+	switch (rate) {
+	case 44100:
+		flag = CLK_896_STATUS_FLAG_RATE_44100;
+		break;
+	case 48000:
+		flag = CLK_896_STATUS_FLAG_RATE_48000;
+		break;
+	case 88200:
+		flag = CLK_896_STATUS_FLAG_RATE_88200;
+		break;
+	case 96000:
+		flag = CLK_896_STATUS_FLAG_RATE_96000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	data &= ~CLK_896_STATUS_MASK_RATE;
+	data |= flag;
+
+	reg = cpu_to_be32(data);
+	return snd_motu_transaction_write(motu, CLK_896_STATUS_OFFSET, &reg, sizeof(reg));
+}
+
+int snd_motu_protocol_v1_set_clock_rate(struct snd_motu *motu, unsigned int rate)
+{
+	if (motu->spec == &snd_motu_spec_828)
+		return set_clock_rate_828(motu, rate);
+	else if (motu->spec == &snd_motu_spec_896)
+		return set_clock_rate_896(motu, rate);
+	else
+		return -ENXIO;
+}
+
+static int get_clock_source_828(struct snd_motu *motu, enum snd_motu_clock_source *src)
+{
+	__be32 reg;
+	u32 data;
+	int err;
+
+	err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, &reg, sizeof(reg));
+	if (err < 0)
+		return err;
+	data = be32_to_cpu(reg) & CLK_828_STATUS_MASK;
+
+	switch (data & CLK_828_STATUS_MASK_SRC) {
+	case CLK_828_STATUS_FLAG_SRC_ADAT_ON_OPT:
+		*src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_OPT;
+		break;
+	case CLK_828_STATUS_FLAG_SRC_SPH:
+		*src = SND_MOTU_CLOCK_SOURCE_SPH;
+		break;
+	case CLK_828_STATUS_FLAG_SRC_SPDIF:
+	{
+		if (data & CLK_828_STATUS_FLAG_OPT_IN_IFACE_IS_SPDIF)
+			*src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX;
+		else
+			*src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_OPT;
+		break;
+	}
+	case CLK_828_STATUS_FLAG_SRC_ADAT_ON_DSUB:
+		*src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_DSUB;
+		break;
+	case CLK_828_STATUS_FLAG_SRC_INTERNAL:
+		*src = SND_MOTU_CLOCK_SOURCE_INTERNAL;
+		break;
+	default:
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int get_clock_source_896(struct snd_motu *motu, enum snd_motu_clock_source *src)
+{
+	__be32 reg;
+	u32 data;
+	int err;
+
+	err = snd_motu_transaction_read(motu, CLK_896_STATUS_OFFSET, &reg, sizeof(reg));
+	if (err < 0)
+		return err;
+	data = be32_to_cpu(reg);
+
+	switch (data & CLK_896_STATUS_MASK_SRC) {
+	case CLK_896_STATUS_FLAG_SRC_INTERNAL:
+		*src = SND_MOTU_CLOCK_SOURCE_INTERNAL;
+		break;
+	case CLK_896_STATUS_FLAG_SRC_ADAT_ON_OPT:
+		*src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_OPT;
+		break;
+	case CLK_896_STATUS_FLAG_SRC_AESEBU:
+		*src = SND_MOTU_CLOCK_SOURCE_AESEBU_ON_XLR;
+		break;
+	case CLK_896_STATUS_FLAG_SRC_SPH:
+		*src = SND_MOTU_CLOCK_SOURCE_SPH;
+		break;
+	case CLK_896_STATUS_FLAG_SRC_WORD:
+		*src = SND_MOTU_CLOCK_SOURCE_WORD_ON_BNC;
+		break;
+	case CLK_896_STATUS_FLAG_SRC_ADAT_ON_DSUB:
+		*src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_DSUB;
+		break;
+	default:
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+int snd_motu_protocol_v1_get_clock_source(struct snd_motu *motu, enum snd_motu_clock_source *src)
+{
+	if (motu->spec == &snd_motu_spec_828)
+		return get_clock_source_828(motu, src);
+	else if (motu->spec == &snd_motu_spec_896)
+		return get_clock_source_896(motu, src);
+	else
+		return -ENXIO;
+}
+
+static int switch_fetching_mode_828(struct snd_motu *motu, bool enable)
+{
+	__be32 reg;
+	u32 data;
+	int err;
+
+	err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, &reg, sizeof(reg));
+	if (err < 0)
+		return err;
+	data = be32_to_cpu(reg) & CLK_828_STATUS_MASK;
+
+	data &= ~(CLK_828_STATUS_FLAG_FETCH_PCM_FRAMES | CLK_828_STATUS_FLAG_ENABLE_OUTPUT);
+	if (enable) {
+		// This transaction should be initiated after the device receives batch of packets
+		// since the device voluntarily mutes outputs. As a workaround, yield processor over
+		// 100 msec.
+		msleep(100);
+		data |= CLK_828_STATUS_FLAG_FETCH_PCM_FRAMES | CLK_828_STATUS_FLAG_ENABLE_OUTPUT;
+	}
+
+	reg = cpu_to_be32(data);
+	return snd_motu_transaction_write(motu, CLK_828_STATUS_OFFSET, &reg, sizeof(reg));
+}
+
+static int switch_fetching_mode_896(struct snd_motu *motu, bool enable)
+{
+	__be32 reg;
+	u32 data;
+	int err;
+
+	err = snd_motu_transaction_read(motu, CLK_896_STATUS_OFFSET, &reg, sizeof(reg));
+	if (err < 0)
+		return err;
+	data = be32_to_cpu(reg);
+
+	data &= ~CLK_896_STATUS_FLAG_FETCH_ENABLE;
+	if (enable)
+		data |= CLK_896_STATUS_FLAG_FETCH_ENABLE | CLK_896_STATUS_FLAG_OUTPUT_ON;
+
+	reg = cpu_to_be32(data);
+	return snd_motu_transaction_write(motu, CLK_896_STATUS_OFFSET, &reg, sizeof(reg));
+}
+
+int snd_motu_protocol_v1_switch_fetching_mode(struct snd_motu *motu, bool enable)
+{
+	if (motu->spec == &snd_motu_spec_828)
+		return switch_fetching_mode_828(motu, enable);
+	else if (motu->spec == &snd_motu_spec_896)
+		return switch_fetching_mode_896(motu, enable);
+	else
+		return -ENXIO;
+}
+
+static int detect_packet_formats_828(struct snd_motu *motu)
+{
+	__be32 reg;
+	u32 data;
+	int err;
+
+	motu->tx_packet_formats.pcm_byte_offset = 4;
+	motu->tx_packet_formats.msg_chunks = 2;
+
+	motu->rx_packet_formats.pcm_byte_offset = 4;
+	motu->rx_packet_formats.msg_chunks = 0;
+
+	err = snd_motu_transaction_read(motu, CLK_828_STATUS_OFFSET, &reg, sizeof(reg));
+	if (err < 0)
+		return err;
+	data = be32_to_cpu(reg) & CLK_828_STATUS_MASK;
+
+	// The number of chunks is just reduced when SPDIF is activated.
+	if (!(data & CLK_828_STATUS_FLAG_OPT_IN_IFACE_IS_SPDIF))
+		motu->tx_packet_formats.pcm_chunks[0] += 8;
+
+	if (!(data & CLK_828_STATUS_FLAG_OPT_OUT_IFACE_IS_SPDIF))
+		motu->rx_packet_formats.pcm_chunks[0] += 8;
+
+	return 0;
+}
+
+static int detect_packet_formats_896(struct snd_motu *motu)
+{
+	// 24bit PCM frames follow to source packet header without message chunk.
+	motu->tx_packet_formats.pcm_byte_offset = 4;
+	motu->rx_packet_formats.pcm_byte_offset = 4;
+
+	// No message chunk in data block.
+	motu->tx_packet_formats.msg_chunks = 0;
+	motu->rx_packet_formats.msg_chunks = 0;
+
+	// Always enable optical interface for ADAT signal since the device have no registers
+	// to refer to current configuration.
+	motu->tx_packet_formats.pcm_chunks[0] += 8;
+	motu->tx_packet_formats.pcm_chunks[1] += 8;
+
+	motu->rx_packet_formats.pcm_chunks[0] += 8;
+	motu->rx_packet_formats.pcm_chunks[1] += 8;
+
+	return 0;
+}
+
+int snd_motu_protocol_v1_cache_packet_formats(struct snd_motu *motu)
+{
+	memcpy(motu->tx_packet_formats.pcm_chunks, motu->spec->tx_fixed_pcm_chunks,
+	       sizeof(motu->tx_packet_formats.pcm_chunks));
+	memcpy(motu->rx_packet_formats.pcm_chunks, motu->spec->rx_fixed_pcm_chunks,
+	       sizeof(motu->rx_packet_formats.pcm_chunks));
+
+	if (motu->spec == &snd_motu_spec_828)
+		return detect_packet_formats_828(motu);
+	else if (motu->spec == &snd_motu_spec_896)
+		return detect_packet_formats_896(motu);
+	else
+		return 0;
+}
+
+const struct snd_motu_spec snd_motu_spec_828 = {
+	.name = "828",
+	.protocol_version = SND_MOTU_PROTOCOL_V1,
+	.tx_fixed_pcm_chunks = {10, 0, 0},
+	.rx_fixed_pcm_chunks = {10, 0, 0},
+};
+
+const struct snd_motu_spec snd_motu_spec_896 = {
+	.name = "896",
+	.tx_fixed_pcm_chunks = {10, 10, 0},
+	.rx_fixed_pcm_chunks = {10, 10, 0},
+};