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(). ... --- sound/firewire/fireface/ff-protocol-latter.c | 540 +++++++++++++++++++++++++++ 1 file changed, 540 insertions(+) create mode 100644 sound/firewire/fireface/ff-protocol-latter.c (limited to 'sound/firewire/fireface/ff-protocol-latter.c') diff --git a/sound/firewire/fireface/ff-protocol-latter.c b/sound/firewire/fireface/ff-protocol-latter.c new file mode 100644 index 000000000..76c3eab36 --- /dev/null +++ b/sound/firewire/fireface/ff-protocol-latter.c @@ -0,0 +1,540 @@ +// SPDX-License-Identifier: GPL-2.0 +// ff-protocol-latter.c - a part of driver for RME Fireface series +// +// Copyright (c) 2019 Takashi Sakamoto + +#include + +#include "ff.h" + +#define LATTER_STF 0xffff00000004ULL +#define LATTER_ISOC_CHANNELS 0xffff00000008ULL +#define LATTER_ISOC_START 0xffff0000000cULL +#define LATTER_FETCH_MODE 0xffff00000010ULL +#define LATTER_SYNC_STATUS 0x0000801c0000ULL + +// The content of sync status register differs between models. +// +// Fireface UCX: +// 0xf0000000: (unidentified) +// 0x0f000000: effective rate of sampling clock +// 0x00f00000: detected rate of word clock on BNC interface +// 0x000f0000: detected rate of ADAT or S/PDIF on optical interface +// 0x0000f000: detected rate of S/PDIF on coaxial interface +// 0x00000e00: effective source of sampling clock +// 0x00000e00: Internal +// 0x00000800: (unidentified) +// 0x00000600: Word clock on BNC interface +// 0x00000400: ADAT on optical interface +// 0x00000200: S/PDIF on coaxial or optical interface +// 0x00000100: Optical interface is used for ADAT signal +// 0x00000080: (unidentified) +// 0x00000040: Synchronized to word clock on BNC interface +// 0x00000020: Synchronized to ADAT or S/PDIF on optical interface +// 0x00000010: Synchronized to S/PDIF on coaxial interface +// 0x00000008: (unidentified) +// 0x00000004: Lock word clock on BNC interface +// 0x00000002: Lock ADAT or S/PDIF on optical interface +// 0x00000001: Lock S/PDIF on coaxial interface +// +// Fireface 802 (and perhaps UFX): +// 0xf0000000: effective rate of sampling clock +// 0x0f000000: detected rate of ADAT-B on 2nd optical interface +// 0x00f00000: detected rate of ADAT-A on 1st optical interface +// 0x000f0000: detected rate of AES/EBU on XLR or coaxial interface +// 0x0000f000: detected rate of word clock on BNC interface +// 0x00000e00: effective source of sampling clock +// 0x00000e00: internal +// 0x00000800: ADAT-B +// 0x00000600: ADAT-A +// 0x00000400: AES/EBU +// 0x00000200: Word clock +// 0x00000080: Synchronized to ADAT-B on 2nd optical interface +// 0x00000040: Synchronized to ADAT-A on 1st optical interface +// 0x00000020: Synchronized to AES/EBU on XLR or 2nd optical interface +// 0x00000010: Synchronized to word clock on BNC interface +// 0x00000008: Lock ADAT-B on 2nd optical interface +// 0x00000004: Lock ADAT-A on 1st optical interface +// 0x00000002: Lock AES/EBU on XLR or 2nd optical interface +// 0x00000001: Lock word clock on BNC interface +// +// The pattern for rate bits: +// 0x00: 32.0 kHz +// 0x01: 44.1 kHz +// 0x02: 48.0 kHz +// 0x04: 64.0 kHz +// 0x05: 88.2 kHz +// 0x06: 96.0 kHz +// 0x08: 128.0 kHz +// 0x09: 176.4 kHz +// 0x0a: 192.0 kHz +static int parse_clock_bits(u32 data, unsigned int *rate, + enum snd_ff_clock_src *src, + enum snd_ff_unit_version unit_version) +{ + static const struct { + unsigned int rate; + u32 flag; + } *rate_entry, rate_entries[] = { + { 32000, 0x00, }, + { 44100, 0x01, }, + { 48000, 0x02, }, + { 64000, 0x04, }, + { 88200, 0x05, }, + { 96000, 0x06, }, + { 128000, 0x08, }, + { 176400, 0x09, }, + { 192000, 0x0a, }, + }; + static const struct { + enum snd_ff_clock_src src; + u32 flag; + } *clk_entry, *clk_entries, ucx_clk_entries[] = { + { SND_FF_CLOCK_SRC_SPDIF, 0x00000200, }, + { SND_FF_CLOCK_SRC_ADAT1, 0x00000400, }, + { SND_FF_CLOCK_SRC_WORD, 0x00000600, }, + { SND_FF_CLOCK_SRC_INTERNAL, 0x00000e00, }, + }, ufx_ff802_clk_entries[] = { + { SND_FF_CLOCK_SRC_WORD, 0x00000200, }, + { SND_FF_CLOCK_SRC_SPDIF, 0x00000400, }, + { SND_FF_CLOCK_SRC_ADAT1, 0x00000600, }, + { SND_FF_CLOCK_SRC_ADAT2, 0x00000800, }, + { SND_FF_CLOCK_SRC_INTERNAL, 0x00000e00, }, + }; + u32 rate_bits; + unsigned int clk_entry_count; + int i; + + if (unit_version == SND_FF_UNIT_VERSION_UCX) { + rate_bits = (data & 0x0f000000) >> 24; + clk_entries = ucx_clk_entries; + clk_entry_count = ARRAY_SIZE(ucx_clk_entries); + } else { + rate_bits = (data & 0xf0000000) >> 28; + clk_entries = ufx_ff802_clk_entries; + clk_entry_count = ARRAY_SIZE(ufx_ff802_clk_entries); + } + + for (i = 0; i < ARRAY_SIZE(rate_entries); ++i) { + rate_entry = rate_entries + i; + if (rate_bits == rate_entry->flag) { + *rate = rate_entry->rate; + break; + } + } + if (i == ARRAY_SIZE(rate_entries)) + return -EIO; + + for (i = 0; i < clk_entry_count; ++i) { + clk_entry = clk_entries + i; + if ((data & 0x000e00) == clk_entry->flag) { + *src = clk_entry->src; + break; + } + } + if (i == clk_entry_count) + return -EIO; + + return 0; +} + +static int latter_get_clock(struct snd_ff *ff, unsigned int *rate, + enum snd_ff_clock_src *src) +{ + __le32 reg; + u32 data; + int err; + + err = snd_fw_transaction(ff->unit, TCODE_READ_QUADLET_REQUEST, + LATTER_SYNC_STATUS, ®, sizeof(reg), 0); + if (err < 0) + return err; + data = le32_to_cpu(reg); + + return parse_clock_bits(data, rate, src, ff->unit_version); +} + +static int latter_switch_fetching_mode(struct snd_ff *ff, bool enable) +{ + u32 data; + __le32 reg; + + if (enable) + data = 0x00000000; + else + data = 0xffffffff; + reg = cpu_to_le32(data); + + return snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + LATTER_FETCH_MODE, ®, sizeof(reg), 0); +} + +static int latter_allocate_resources(struct snd_ff *ff, unsigned int rate) +{ + enum snd_ff_stream_mode mode; + unsigned int code; + __le32 reg; + unsigned int count; + int i; + int err; + + // Set the number of data blocks transferred in a second. + if (rate % 48000 == 0) + code = 0x04; + else if (rate % 44100 == 0) + code = 0x02; + else if (rate % 32000 == 0) + code = 0x00; + else + return -EINVAL; + + if (rate >= 64000 && rate < 128000) + code |= 0x08; + else if (rate >= 128000) + code |= 0x10; + + reg = cpu_to_le32(code); + err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + LATTER_STF, ®, sizeof(reg), 0); + if (err < 0) + return err; + + // Confirm to shift transmission clock. + count = 0; + while (count++ < 10) { + unsigned int curr_rate; + enum snd_ff_clock_src src; + + err = latter_get_clock(ff, &curr_rate, &src); + if (err < 0) + return err; + + if (curr_rate == rate) + break; + } + if (count > 10) + return -ETIMEDOUT; + + for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); ++i) { + if (rate == amdtp_rate_table[i]) + break; + } + if (i == ARRAY_SIZE(amdtp_rate_table)) + return -EINVAL; + + err = snd_ff_stream_get_multiplier_mode(i, &mode); + if (err < 0) + return err; + + // Keep resources for in-stream. + ff->tx_resources.channels_mask = 0x00000000000000ffuLL; + err = fw_iso_resources_allocate(&ff->tx_resources, + amdtp_stream_get_max_payload(&ff->tx_stream), + fw_parent_device(ff->unit)->max_speed); + if (err < 0) + return err; + + // Keep resources for out-stream. + ff->rx_resources.channels_mask = 0x00000000000000ffuLL; + err = fw_iso_resources_allocate(&ff->rx_resources, + amdtp_stream_get_max_payload(&ff->rx_stream), + fw_parent_device(ff->unit)->max_speed); + if (err < 0) + fw_iso_resources_free(&ff->tx_resources); + + return err; +} + +static int latter_begin_session(struct snd_ff *ff, unsigned int rate) +{ + unsigned int generation = ff->rx_resources.generation; + unsigned int flag; + u32 data; + __le32 reg; + int err; + + if (ff->unit_version == SND_FF_UNIT_VERSION_UCX) { + // For Fireface UCX. Always use the maximum number of data + // channels in data block of packet. + if (rate >= 32000 && rate <= 48000) + flag = 0x92; + else if (rate >= 64000 && rate <= 96000) + flag = 0x8e; + else if (rate >= 128000 && rate <= 192000) + flag = 0x8c; + else + return -EINVAL; + } else { + // For Fireface UFX and 802. Due to bandwidth limitation on + // IEEE 1394a (400 Mbps), Analog 1-12 and AES are available + // without any ADAT at quadruple speed. + if (rate >= 32000 && rate <= 48000) + flag = 0x9e; + else if (rate >= 64000 && rate <= 96000) + flag = 0x96; + else if (rate >= 128000 && rate <= 192000) + flag = 0x8e; + else + return -EINVAL; + } + + if (generation != fw_parent_device(ff->unit)->card->generation) { + err = fw_iso_resources_update(&ff->tx_resources); + if (err < 0) + return err; + + err = fw_iso_resources_update(&ff->rx_resources); + if (err < 0) + return err; + } + + data = (ff->tx_resources.channel << 8) | ff->rx_resources.channel; + reg = cpu_to_le32(data); + err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + LATTER_ISOC_CHANNELS, ®, sizeof(reg), 0); + if (err < 0) + return err; + + reg = cpu_to_le32(flag); + return snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + LATTER_ISOC_START, ®, sizeof(reg), 0); +} + +static void latter_finish_session(struct snd_ff *ff) +{ + __le32 reg; + + reg = cpu_to_le32(0x00000000); + snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + LATTER_ISOC_START, ®, sizeof(reg), 0); +} + +static void latter_dump_status(struct snd_ff *ff, struct snd_info_buffer *buffer) +{ + static const struct { + char *const label; + u32 locked_mask; + u32 synced_mask; + } *clk_entry, *clk_entries, ucx_clk_entries[] = { + { "S/PDIF", 0x00000001, 0x00000010, }, + { "ADAT", 0x00000002, 0x00000020, }, + { "WDClk", 0x00000004, 0x00000040, }, + }, ufx_ff802_clk_entries[] = { + { "WDClk", 0x00000001, 0x00000010, }, + { "AES/EBU", 0x00000002, 0x00000020, }, + { "ADAT-A", 0x00000004, 0x00000040, }, + { "ADAT-B", 0x00000008, 0x00000080, }, + }; + __le32 reg; + u32 data; + unsigned int rate; + enum snd_ff_clock_src src; + const char *label; + unsigned int clk_entry_count; + int i; + int err; + + err = snd_fw_transaction(ff->unit, TCODE_READ_QUADLET_REQUEST, + LATTER_SYNC_STATUS, ®, sizeof(reg), 0); + if (err < 0) + return; + data = le32_to_cpu(reg); + + snd_iprintf(buffer, "External source detection:\n"); + + if (ff->unit_version == SND_FF_UNIT_VERSION_UCX) { + clk_entries = ucx_clk_entries; + clk_entry_count = ARRAY_SIZE(ucx_clk_entries); + } else { + clk_entries = ufx_ff802_clk_entries; + clk_entry_count = ARRAY_SIZE(ufx_ff802_clk_entries); + } + + for (i = 0; i < clk_entry_count; ++i) { + clk_entry = clk_entries + i; + snd_iprintf(buffer, "%s: ", clk_entry->label); + if (data & clk_entry->locked_mask) { + if (data & clk_entry->synced_mask) + snd_iprintf(buffer, "sync\n"); + else + snd_iprintf(buffer, "lock\n"); + } else { + snd_iprintf(buffer, "none\n"); + } + } + + err = parse_clock_bits(data, &rate, &src, ff->unit_version); + if (err < 0) + return; + label = snd_ff_proc_get_clk_label(src); + if (!label) + return; + + snd_iprintf(buffer, "Referred clock: %s %d\n", label, rate); +} + +// NOTE: transactions are transferred within 0x00-0x7f in allocated range of +// address. This seems to be for check of discontinuity in receiver side. +// +// Like Fireface 400, drivers can select one of 4 options for lower 4 bytes of +// destination address by bit flags in quadlet register (little endian) at +// 0x'ffff'0000'0014: +// +// bit flags: offset of destination address +// - 0x00002000: 0x'....'....'0000'0000 +// - 0x00004000: 0x'....'....'0000'0080 +// - 0x00008000: 0x'....'....'0000'0100 +// - 0x00010000: 0x'....'....'0000'0180 +// +// Drivers can suppress the device to transfer asynchronous transactions by +// clear these bit flags. +// +// Actually, the register is write-only and includes the other settings such as +// input attenuation. This driver allocates for the first option +// (0x'....'....'0000'0000) and expects userspace application to configure the +// register for it. +static void latter_handle_midi_msg(struct snd_ff *ff, unsigned int offset, + __le32 *buf, size_t length) +{ + u32 data = le32_to_cpu(*buf); + unsigned int index = (data & 0x000000f0) >> 4; + u8 byte[3]; + struct snd_rawmidi_substream *substream; + unsigned int len; + + if (index >= ff->spec->midi_in_ports) + return; + + switch (data & 0x0000000f) { + case 0x00000008: + case 0x00000009: + case 0x0000000a: + case 0x0000000b: + case 0x0000000e: + len = 3; + break; + case 0x0000000c: + case 0x0000000d: + len = 2; + break; + default: + len = data & 0x00000003; + if (len == 0) + len = 3; + break; + } + + byte[0] = (data & 0x0000ff00) >> 8; + byte[1] = (data & 0x00ff0000) >> 16; + byte[2] = (data & 0xff000000) >> 24; + + substream = READ_ONCE(ff->tx_midi_substreams[index]); + if (substream) + snd_rawmidi_receive(substream, byte, len); +} + +/* + * When return minus value, given argument is not MIDI status. + * When return 0, given argument is a beginning of system exclusive. + * When return the others, given argument is MIDI data. + */ +static inline int calculate_message_bytes(u8 status) +{ + switch (status) { + case 0xf6: /* Tune request. */ + case 0xf8: /* Timing clock. */ + case 0xfa: /* Start. */ + case 0xfb: /* Continue. */ + case 0xfc: /* Stop. */ + case 0xfe: /* Active sensing. */ + case 0xff: /* System reset. */ + return 1; + case 0xf1: /* MIDI time code quarter frame. */ + case 0xf3: /* Song select. */ + return 2; + case 0xf2: /* Song position pointer. */ + return 3; + case 0xf0: /* Exclusive. */ + return 0; + case 0xf7: /* End of exclusive. */ + break; + case 0xf4: /* Undefined. */ + case 0xf5: /* Undefined. */ + case 0xf9: /* Undefined. */ + case 0xfd: /* Undefined. */ + break; + default: + switch (status & 0xf0) { + case 0x80: /* Note on. */ + case 0x90: /* Note off. */ + case 0xa0: /* Polyphonic key pressure. */ + case 0xb0: /* Control change and Mode change. */ + case 0xe0: /* Pitch bend change. */ + return 3; + case 0xc0: /* Program change. */ + case 0xd0: /* Channel pressure. */ + return 2; + default: + break; + } + break; + } + + return -EINVAL; +} + +static int latter_fill_midi_msg(struct snd_ff *ff, + struct snd_rawmidi_substream *substream, + unsigned int port) +{ + u32 data = {0}; + u8 *buf = (u8 *)&data; + int consumed; + + buf[0] = port << 4; + consumed = snd_rawmidi_transmit_peek(substream, buf + 1, 3); + if (consumed <= 0) + return consumed; + + if (!ff->on_sysex[port]) { + if (buf[1] != 0xf0) { + if (consumed < calculate_message_bytes(buf[1])) + return 0; + } else { + // The beginning of exclusives. + ff->on_sysex[port] = true; + } + + buf[0] |= consumed; + } else { + if (buf[1] != 0xf7) { + if (buf[2] == 0xf7 || buf[3] == 0xf7) { + // Transfer end code at next time. + consumed -= 1; + } + + buf[0] |= consumed; + } else { + // The end of exclusives. + ff->on_sysex[port] = false; + consumed = 1; + buf[0] |= 0x0f; + } + } + + ff->msg_buf[port][0] = cpu_to_le32(data); + ff->rx_bytes[port] = consumed; + + return 1; +} + +const struct snd_ff_protocol snd_ff_protocol_latter = { + .handle_midi_msg = latter_handle_midi_msg, + .fill_midi_msg = latter_fill_midi_msg, + .get_clock = latter_get_clock, + .switch_fetching_mode = latter_switch_fetching_mode, + .allocate_resources = latter_allocate_resources, + .begin_session = latter_begin_session, + .finish_session = latter_finish_session, + .dump_status = latter_dump_status, +}; -- cgit v1.2.3