From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- .../motu/motu-register-dsp-message-parser.c | 420 +++++++++++++++++++++ 1 file changed, 420 insertions(+) create mode 100644 sound/firewire/motu/motu-register-dsp-message-parser.c (limited to 'sound/firewire/motu/motu-register-dsp-message-parser.c') diff --git a/sound/firewire/motu/motu-register-dsp-message-parser.c b/sound/firewire/motu/motu-register-dsp-message-parser.c new file mode 100644 index 000000000..0c5875675 --- /dev/null +++ b/sound/firewire/motu/motu-register-dsp-message-parser.c @@ -0,0 +1,420 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// motu-register-dsp-message-parser.c - a part of driver for MOTU FireWire series +// +// Copyright (c) 2021 Takashi Sakamoto + +// Below models allow software to configure their DSP functions by asynchronous transaction +// to access their internal registers. +// * 828 mk2 +// * 896hd +// * Traveler +// * 8 pre +// * Ultralite +// * 4 pre +// * Audio Express +// +// Additionally, isochronous packets from the above models include messages to notify state of +// DSP. The messages are two set of 3 byte data in 2nd and 3rd quadlet of data block. When user +// operates hardware components such as dial and switch, corresponding messages are transferred. +// The messages include Hardware metering and MIDI messages as well. + +#include "motu.h" + +#define MSG_FLAG_POS 4 +#define MSG_FLAG_TYPE_MASK 0xf8 +#define MSG_FLAG_MIDI_MASK 0x01 +#define MSG_FLAG_MODEL_SPECIFIC_MASK 0x06 +#define MSG_FLAG_8PRE 0x00 +#define MSG_FLAG_ULTRALITE 0x04 +#define MSG_FLAG_TRAVELER 0x04 +#define MSG_FLAG_828MK2 0x04 +#define MSG_FLAG_896HD 0x04 +#define MSG_FLAG_4PRE 0x05 // MIDI mask is in 8th byte. +#define MSG_FLAG_AUDIOEXPRESS 0x05 // MIDI mask is in 8th byte. +#define MSG_FLAG_TYPE_SHIFT 3 +#define MSG_VALUE_POS 5 +#define MSG_MIDI_BYTE_POS 6 +#define MSG_METER_IDX_POS 7 + +// In 4 pre and Audio express, meter index is in 6th byte. MIDI flag is in 8th byte and MIDI byte +// is in 7th byte. +#define MSG_METER_IDX_POS_4PRE_AE 6 +#define MSG_MIDI_BYTE_POS_4PRE_AE 7 +#define MSG_FLAG_MIDI_POS_4PRE_AE 8 + +enum register_dsp_msg_type { + // Used for messages with no information. + INVALID = 0x00, + MIXER_SELECT = 0x01, + MIXER_SRC_GAIN = 0x02, + MIXER_SRC_PAN = 0x03, + MIXER_SRC_FLAG = 0x04, + MIXER_OUTPUT_PAIRED_VOLUME = 0x05, + MIXER_OUTPUT_PAIRED_FLAG = 0x06, + MAIN_OUTPUT_PAIRED_VOLUME = 0x07, + HP_OUTPUT_PAIRED_VOLUME = 0x08, + HP_OUTPUT_PAIRED_ASSIGNMENT = 0x09, + // Transferred by all models but the purpose is still unknown. + UNKNOWN_0 = 0x0a, + // Specific to 828mk2, 896hd, Traveler. + UNKNOWN_2 = 0x0c, + // Specific to 828mk2, Traveler, and 896hd (not functional). + LINE_INPUT_BOOST = 0x0d, + // Specific to 828mk2, Traveler, and 896hd (not functional). + LINE_INPUT_NOMINAL_LEVEL = 0x0e, + // Specific to Ultralite, 4 pre, Audio express, and 8 pre (not functional). + INPUT_GAIN_AND_INVERT = 0x15, + // Specific to 4 pre, and Audio express. + INPUT_FLAG = 0x16, + // Specific to 4 pre, and Audio express. + MIXER_SRC_PAIRED_BALANCE = 0x17, + // Specific to 4 pre, and Audio express. + MIXER_SRC_PAIRED_WIDTH = 0x18, + // Transferred by all models. This type of message interposes the series of the other + // messages. The message delivers signal level up to 96.0 kHz. In 828mk2, 896hd, and + // Traveler, one of physical outputs is selected for the message. The selection is done + // by LSB one byte in asynchronous write quadlet transaction to 0x'ffff'f000'0b2c. + METER = 0x1f, +}; + +#define EVENT_QUEUE_SIZE 16 + +struct msg_parser { + spinlock_t lock; + struct snd_firewire_motu_register_dsp_meter meter; + bool meter_pos_quirk; + + struct snd_firewire_motu_register_dsp_parameter param; + u8 prev_mixer_src_type; + u8 mixer_ch; + u8 mixer_src_ch; + + u8 input_ch; + u8 prev_msg_type; + + u32 event_queue[EVENT_QUEUE_SIZE]; + unsigned int push_pos; + unsigned int pull_pos; +}; + +int snd_motu_register_dsp_message_parser_new(struct snd_motu *motu) +{ + struct msg_parser *parser; + parser = devm_kzalloc(&motu->card->card_dev, sizeof(*parser), GFP_KERNEL); + if (!parser) + return -ENOMEM; + spin_lock_init(&parser->lock); + if (motu->spec == &snd_motu_spec_4pre || motu->spec == &snd_motu_spec_audio_express) + parser->meter_pos_quirk = true; + motu->message_parser = parser; + return 0; +} + +int snd_motu_register_dsp_message_parser_init(struct snd_motu *motu) +{ + struct msg_parser *parser = motu->message_parser; + + parser->prev_mixer_src_type = INVALID; + parser->mixer_ch = 0xff; + parser->mixer_src_ch = 0xff; + parser->prev_msg_type = INVALID; + + return 0; +} + +// Rough implementaion of queue without overrun check. +static void queue_event(struct snd_motu *motu, u8 msg_type, u8 identifier0, u8 identifier1, u8 val) +{ + struct msg_parser *parser = motu->message_parser; + unsigned int pos = parser->push_pos; + u32 entry; + + if (!motu->hwdep || motu->hwdep->used == 0) + return; + + entry = (msg_type << 24) | (identifier0 << 16) | (identifier1 << 8) | val; + parser->event_queue[pos] = entry; + + ++pos; + if (pos >= EVENT_QUEUE_SIZE) + pos = 0; + parser->push_pos = pos; +} + +void snd_motu_register_dsp_message_parser_parse(struct snd_motu *motu, const struct pkt_desc *descs, + unsigned int desc_count, unsigned int data_block_quadlets) +{ + struct msg_parser *parser = motu->message_parser; + bool meter_pos_quirk = parser->meter_pos_quirk; + unsigned int pos = parser->push_pos; + unsigned long flags; + int i; + + spin_lock_irqsave(&parser->lock, flags); + + for (i = 0; i < desc_count; ++i) { + const struct pkt_desc *desc = descs + i; + __be32 *buffer = desc->ctx_payload; + unsigned int data_blocks = desc->data_blocks; + int j; + + for (j = 0; j < data_blocks; ++j) { + u8 *b = (u8 *)buffer; + u8 msg_type = (b[MSG_FLAG_POS] & MSG_FLAG_TYPE_MASK) >> MSG_FLAG_TYPE_SHIFT; + u8 val = b[MSG_VALUE_POS]; + + buffer += data_block_quadlets; + + switch (msg_type) { + case MIXER_SELECT: + { + u8 mixer_ch = val / 0x20; + if (mixer_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT) { + parser->mixer_src_ch = 0; + parser->mixer_ch = mixer_ch; + } + break; + } + case MIXER_SRC_GAIN: + case MIXER_SRC_PAN: + case MIXER_SRC_FLAG: + case MIXER_SRC_PAIRED_BALANCE: + case MIXER_SRC_PAIRED_WIDTH: + { + struct snd_firewire_motu_register_dsp_parameter *param = &parser->param; + u8 mixer_ch = parser->mixer_ch; + u8 mixer_src_ch = parser->mixer_src_ch; + + if (msg_type != parser->prev_mixer_src_type) + mixer_src_ch = 0; + else + ++mixer_src_ch; + parser->prev_mixer_src_type = msg_type; + + if (mixer_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT && + mixer_src_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT) { + u8 mixer_ch = parser->mixer_ch; + + switch (msg_type) { + case MIXER_SRC_GAIN: + if (param->mixer.source[mixer_ch].gain[mixer_src_ch] != val) { + queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val); + param->mixer.source[mixer_ch].gain[mixer_src_ch] = val; + } + break; + case MIXER_SRC_PAN: + if (param->mixer.source[mixer_ch].pan[mixer_src_ch] != val) { + queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val); + param->mixer.source[mixer_ch].pan[mixer_src_ch] = val; + } + break; + case MIXER_SRC_FLAG: + if (param->mixer.source[mixer_ch].flag[mixer_src_ch] != val) { + queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val); + param->mixer.source[mixer_ch].flag[mixer_src_ch] = val; + } + break; + case MIXER_SRC_PAIRED_BALANCE: + if (param->mixer.source[mixer_ch].paired_balance[mixer_src_ch] != val) { + queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val); + param->mixer.source[mixer_ch].paired_balance[mixer_src_ch] = val; + } + break; + case MIXER_SRC_PAIRED_WIDTH: + if (param->mixer.source[mixer_ch].paired_width[mixer_src_ch] != val) { + queue_event(motu, msg_type, mixer_ch, mixer_src_ch, val); + param->mixer.source[mixer_ch].paired_width[mixer_src_ch] = val; + } + break; + default: + break; + } + + parser->mixer_src_ch = mixer_src_ch; + } + break; + } + case MIXER_OUTPUT_PAIRED_VOLUME: + case MIXER_OUTPUT_PAIRED_FLAG: + { + struct snd_firewire_motu_register_dsp_parameter *param = &parser->param; + u8 mixer_ch = parser->mixer_ch; + + if (mixer_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT) { + switch (msg_type) { + case MIXER_OUTPUT_PAIRED_VOLUME: + if (param->mixer.output.paired_volume[mixer_ch] != val) { + queue_event(motu, msg_type, mixer_ch, 0, val); + param->mixer.output.paired_volume[mixer_ch] = val; + } + break; + case MIXER_OUTPUT_PAIRED_FLAG: + if (param->mixer.output.paired_flag[mixer_ch] != val) { + queue_event(motu, msg_type, mixer_ch, 0, val); + param->mixer.output.paired_flag[mixer_ch] = val; + } + break; + default: + break; + } + } + break; + } + case MAIN_OUTPUT_PAIRED_VOLUME: + if (parser->param.output.main_paired_volume != val) { + queue_event(motu, msg_type, 0, 0, val); + parser->param.output.main_paired_volume = val; + } + break; + case HP_OUTPUT_PAIRED_VOLUME: + if (parser->param.output.hp_paired_volume != val) { + queue_event(motu, msg_type, 0, 0, val); + parser->param.output.hp_paired_volume = val; + } + break; + case HP_OUTPUT_PAIRED_ASSIGNMENT: + if (parser->param.output.hp_paired_assignment != val) { + queue_event(motu, msg_type, 0, 0, val); + parser->param.output.hp_paired_assignment = val; + } + break; + case LINE_INPUT_BOOST: + if (parser->param.line_input.boost_flag != val) { + queue_event(motu, msg_type, 0, 0, val); + parser->param.line_input.boost_flag = val; + } + break; + case LINE_INPUT_NOMINAL_LEVEL: + if (parser->param.line_input.nominal_level_flag != val) { + queue_event(motu, msg_type, 0, 0, val); + parser->param.line_input.nominal_level_flag = val; + } + break; + case INPUT_GAIN_AND_INVERT: + case INPUT_FLAG: + { + struct snd_firewire_motu_register_dsp_parameter *param = &parser->param; + u8 input_ch = parser->input_ch; + + if (parser->prev_msg_type != msg_type) + input_ch = 0; + else + ++input_ch; + + if (input_ch < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_INPUT_COUNT) { + switch (msg_type) { + case INPUT_GAIN_AND_INVERT: + if (param->input.gain_and_invert[input_ch] != val) { + queue_event(motu, msg_type, input_ch, 0, val); + param->input.gain_and_invert[input_ch] = val; + } + break; + case INPUT_FLAG: + if (param->input.flag[input_ch] != val) { + queue_event(motu, msg_type, input_ch, 0, val); + param->input.flag[input_ch] = val; + } + break; + default: + break; + } + parser->input_ch = input_ch; + } + break; + } + case UNKNOWN_0: + case UNKNOWN_2: + break; + case METER: + { + u8 pos; + + if (!meter_pos_quirk) + pos = b[MSG_METER_IDX_POS]; + else + pos = b[MSG_METER_IDX_POS_4PRE_AE]; + + if (pos < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_INPUT_COUNT) { + parser->meter.data[pos] = val; + } else if (pos >= 0x80) { + pos -= (0x80 - SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_INPUT_COUNT); + + if (pos < SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_COUNT) + parser->meter.data[pos] = val; + } + + // The message for meter is interruptible to the series of other + // types of messages. Don't cache it. + fallthrough; + } + case INVALID: + default: + // Don't cache it. + continue; + } + + parser->prev_msg_type = msg_type; + } + } + + if (pos != parser->push_pos) + wake_up(&motu->hwdep_wait); + + spin_unlock_irqrestore(&parser->lock, flags); +} + +void snd_motu_register_dsp_message_parser_copy_meter(struct snd_motu *motu, + struct snd_firewire_motu_register_dsp_meter *meter) +{ + struct msg_parser *parser = motu->message_parser; + unsigned long flags; + + spin_lock_irqsave(&parser->lock, flags); + memcpy(meter, &parser->meter, sizeof(*meter)); + spin_unlock_irqrestore(&parser->lock, flags); +} + +void snd_motu_register_dsp_message_parser_copy_parameter(struct snd_motu *motu, + struct snd_firewire_motu_register_dsp_parameter *param) +{ + struct msg_parser *parser = motu->message_parser; + unsigned long flags; + + spin_lock_irqsave(&parser->lock, flags); + memcpy(param, &parser->param, sizeof(*param)); + spin_unlock_irqrestore(&parser->lock, flags); +} + +unsigned int snd_motu_register_dsp_message_parser_count_event(struct snd_motu *motu) +{ + struct msg_parser *parser = motu->message_parser; + + if (parser->pull_pos > parser->push_pos) + return EVENT_QUEUE_SIZE - parser->pull_pos + parser->push_pos; + else + return parser->push_pos - parser->pull_pos; +} + +bool snd_motu_register_dsp_message_parser_copy_event(struct snd_motu *motu, u32 *event) +{ + struct msg_parser *parser = motu->message_parser; + unsigned int pos = parser->pull_pos; + unsigned long flags; + + if (pos == parser->push_pos) + return false; + + spin_lock_irqsave(&parser->lock, flags); + + *event = parser->event_queue[pos]; + + ++pos; + if (pos >= EVENT_QUEUE_SIZE) + pos = 0; + parser->pull_pos = pos; + + spin_unlock_irqrestore(&parser->lock, flags); + + return true; +} -- cgit v1.2.3