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/core/seq/oss/seq_oss_event.c | 447 +++++++++++++++++++++++++++++++++++++ 1 file changed, 447 insertions(+) create mode 100644 sound/core/seq/oss/seq_oss_event.c (limited to 'sound/core/seq/oss/seq_oss_event.c') diff --git a/sound/core/seq/oss/seq_oss_event.c b/sound/core/seq/oss/seq_oss_event.c new file mode 100644 index 000000000..7b7c925dd --- /dev/null +++ b/sound/core/seq/oss/seq_oss_event.c @@ -0,0 +1,447 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * OSS compatible sequencer driver + * + * Copyright (C) 1998,99 Takashi Iwai + */ + +#include "seq_oss_device.h" +#include "seq_oss_synth.h" +#include "seq_oss_midi.h" +#include "seq_oss_event.h" +#include "seq_oss_timer.h" +#include +#include "seq_oss_readq.h" +#include "seq_oss_writeq.h" +#include + + +/* + * prototypes + */ +static int extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev); +static int chn_voice_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev); +static int chn_common_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev); +static int timing_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev); +static int local_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev); +static int old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev); +static int note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev); +static int note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev); +static int set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev); +static int set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev); +static int set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev); + + +/* + * convert an OSS event to ALSA event + * return 0 : enqueued + * non-zero : invalid - ignored + */ + +int +snd_seq_oss_process_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) +{ + switch (q->s.code) { + case SEQ_EXTENDED: + return extended_event(dp, q, ev); + + case EV_CHN_VOICE: + return chn_voice_event(dp, q, ev); + + case EV_CHN_COMMON: + return chn_common_event(dp, q, ev); + + case EV_TIMING: + return timing_event(dp, q, ev); + + case EV_SEQ_LOCAL: + return local_event(dp, q, ev); + + case EV_SYSEX: + return snd_seq_oss_synth_sysex(dp, q->x.dev, q->x.buf, ev); + + case SEQ_MIDIPUTC: + if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) + return -EINVAL; + /* put a midi byte */ + if (! is_write_mode(dp->file_mode)) + break; + if (snd_seq_oss_midi_open(dp, q->s.dev, SNDRV_SEQ_OSS_FILE_WRITE)) + break; + if (snd_seq_oss_midi_filemode(dp, q->s.dev) & SNDRV_SEQ_OSS_FILE_WRITE) + return snd_seq_oss_midi_putc(dp, q->s.dev, q->s.parm1, ev); + break; + + case SEQ_ECHO: + if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) + return -EINVAL; + return set_echo_event(dp, q, ev); + + case SEQ_PRIVATE: + if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) + return -EINVAL; + return snd_seq_oss_synth_raw_event(dp, q->c[1], q->c, ev); + + default: + if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) + return -EINVAL; + return old_event(dp, q, ev); + } + return -EINVAL; +} + +/* old type events: mode1 only */ +static int +old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) +{ + switch (q->s.code) { + case SEQ_NOTEOFF: + return note_off_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev); + + case SEQ_NOTEON: + return note_on_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev); + + case SEQ_WAIT: + /* skip */ + break; + + case SEQ_PGMCHANGE: + return set_control_event(dp, 0, SNDRV_SEQ_EVENT_PGMCHANGE, + q->n.chn, 0, q->n.note, ev); + + case SEQ_SYNCTIMER: + return snd_seq_oss_timer_reset(dp->timer); + } + + return -EINVAL; +} + +/* 8bytes extended event: mode1 only */ +static int +extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) +{ + int val; + + switch (q->e.cmd) { + case SEQ_NOTEOFF: + return note_off_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev); + + case SEQ_NOTEON: + return note_on_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev); + + case SEQ_PGMCHANGE: + return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_PGMCHANGE, + q->e.chn, 0, q->e.p1, ev); + + case SEQ_AFTERTOUCH: + return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CHANPRESS, + q->e.chn, 0, q->e.p1, ev); + + case SEQ_BALANCE: + /* convert -128:127 to 0:127 */ + val = (char)q->e.p1; + val = (val + 128) / 2; + return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CONTROLLER, + q->e.chn, CTL_PAN, val, ev); + + case SEQ_CONTROLLER: + val = ((short)q->e.p3 << 8) | (short)q->e.p2; + switch (q->e.p1) { + case CTRL_PITCH_BENDER: /* SEQ1 V2 control */ + /* -0x2000:0x1fff */ + return set_control_event(dp, q->e.dev, + SNDRV_SEQ_EVENT_PITCHBEND, + q->e.chn, 0, val, ev); + case CTRL_PITCH_BENDER_RANGE: + /* conversion: 100/semitone -> 128/semitone */ + return set_control_event(dp, q->e.dev, + SNDRV_SEQ_EVENT_REGPARAM, + q->e.chn, 0, val*128/100, ev); + default: + return set_control_event(dp, q->e.dev, + SNDRV_SEQ_EVENT_CONTROL14, + q->e.chn, q->e.p1, val, ev); + } + + case SEQ_VOLMODE: + return snd_seq_oss_synth_raw_event(dp, q->e.dev, q->c, ev); + + } + return -EINVAL; +} + +/* channel voice events: mode1 and 2 */ +static int +chn_voice_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) +{ + if (q->v.chn >= 32) + return -EINVAL; + switch (q->v.cmd) { + case MIDI_NOTEON: + return note_on_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev); + + case MIDI_NOTEOFF: + return note_off_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev); + + case MIDI_KEY_PRESSURE: + return set_note_event(dp, q->v.dev, SNDRV_SEQ_EVENT_KEYPRESS, + q->v.chn, q->v.note, q->v.parm, ev); + + } + return -EINVAL; +} + +/* channel common events: mode1 and 2 */ +static int +chn_common_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) +{ + if (q->l.chn >= 32) + return -EINVAL; + switch (q->l.cmd) { + case MIDI_PGM_CHANGE: + return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PGMCHANGE, + q->l.chn, 0, q->l.p1, ev); + + case MIDI_CTL_CHANGE: + return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CONTROLLER, + q->l.chn, q->l.p1, q->l.val, ev); + + case MIDI_PITCH_BEND: + /* conversion: 0:0x3fff -> -0x2000:0x1fff */ + return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PITCHBEND, + q->l.chn, 0, q->l.val - 8192, ev); + + case MIDI_CHN_PRESSURE: + return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CHANPRESS, + q->l.chn, 0, q->l.val, ev); + } + return -EINVAL; +} + +/* timer events: mode1 and mode2 */ +static int +timing_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) +{ + switch (q->t.cmd) { + case TMR_ECHO: + if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) + return set_echo_event(dp, q, ev); + else { + union evrec tmp; + memset(&tmp, 0, sizeof(tmp)); + /* XXX: only for little-endian! */ + tmp.echo = (q->t.time << 8) | SEQ_ECHO; + return set_echo_event(dp, &tmp, ev); + } + + case TMR_STOP: + if (dp->seq_mode) + return snd_seq_oss_timer_stop(dp->timer); + return 0; + + case TMR_CONTINUE: + if (dp->seq_mode) + return snd_seq_oss_timer_continue(dp->timer); + return 0; + + case TMR_TEMPO: + if (dp->seq_mode) + return snd_seq_oss_timer_tempo(dp->timer, q->t.time); + return 0; + } + + return -EINVAL; +} + +/* local events: mode1 and 2 */ +static int +local_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) +{ + return -EINVAL; +} + +/* + * process note-on event for OSS synth + * three different modes are available: + * - SNDRV_SEQ_OSS_PROCESS_EVENTS (for one-voice per channel mode) + * Accept note 255 as volume change. + * - SNDRV_SEQ_OSS_PASS_EVENTS + * Pass all events to lowlevel driver anyway + * - SNDRV_SEQ_OSS_PROCESS_KEYPRESS (mostly for Emu8000) + * Use key-pressure if note >= 128 + */ +static int +note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev) +{ + struct seq_oss_synthinfo *info; + + info = snd_seq_oss_synth_info(dp, dev); + if (!info) + return -ENXIO; + + switch (info->arg.event_passing) { + case SNDRV_SEQ_OSS_PROCESS_EVENTS: + if (! info->ch || ch < 0 || ch >= info->nr_voices) { + /* pass directly */ + return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); + } + + ch = array_index_nospec(ch, info->nr_voices); + if (note == 255 && info->ch[ch].note >= 0) { + /* volume control */ + int type; + //if (! vel) + /* set volume to zero -- note off */ + // type = SNDRV_SEQ_EVENT_NOTEOFF; + //else + if (info->ch[ch].vel) + /* sample already started -- volume change */ + type = SNDRV_SEQ_EVENT_KEYPRESS; + else + /* sample not started -- start now */ + type = SNDRV_SEQ_EVENT_NOTEON; + info->ch[ch].vel = vel; + return set_note_event(dp, dev, type, ch, info->ch[ch].note, vel, ev); + } else if (note >= 128) + return -EINVAL; /* invalid */ + + if (note != info->ch[ch].note && info->ch[ch].note >= 0) + /* note changed - note off at beginning */ + set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, info->ch[ch].note, 0, ev); + /* set current status */ + info->ch[ch].note = note; + info->ch[ch].vel = vel; + if (vel) /* non-zero velocity - start the note now */ + return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); + return -EINVAL; + + case SNDRV_SEQ_OSS_PASS_EVENTS: + /* pass the event anyway */ + return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); + + case SNDRV_SEQ_OSS_PROCESS_KEYPRESS: + if (note >= 128) /* key pressure: shifted by 128 */ + return set_note_event(dp, dev, SNDRV_SEQ_EVENT_KEYPRESS, ch, note - 128, vel, ev); + else /* normal note-on event */ + return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); + } + return -EINVAL; +} + +/* + * process note-off event for OSS synth + */ +static int +note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev) +{ + struct seq_oss_synthinfo *info; + + info = snd_seq_oss_synth_info(dp, dev); + if (!info) + return -ENXIO; + + switch (info->arg.event_passing) { + case SNDRV_SEQ_OSS_PROCESS_EVENTS: + if (! info->ch || ch < 0 || ch >= info->nr_voices) { + /* pass directly */ + return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); + } + + ch = array_index_nospec(ch, info->nr_voices); + if (info->ch[ch].note >= 0) { + note = info->ch[ch].note; + info->ch[ch].vel = 0; + info->ch[ch].note = -1; + return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev); + } + return -EINVAL; /* invalid */ + + case SNDRV_SEQ_OSS_PASS_EVENTS: + case SNDRV_SEQ_OSS_PROCESS_KEYPRESS: + /* pass the event anyway */ + return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev); + + } + return -EINVAL; +} + +/* + * create a note event + */ +static int +set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev) +{ + if (!snd_seq_oss_synth_info(dp, dev)) + return -ENXIO; + + ev->type = type; + snd_seq_oss_synth_addr(dp, dev, ev); + ev->data.note.channel = ch; + ev->data.note.note = note; + ev->data.note.velocity = vel; + + return 0; +} + +/* + * create a control event + */ +static int +set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev) +{ + if (!snd_seq_oss_synth_info(dp, dev)) + return -ENXIO; + + ev->type = type; + snd_seq_oss_synth_addr(dp, dev, ev); + ev->data.control.channel = ch; + ev->data.control.param = param; + ev->data.control.value = val; + + return 0; +} + +/* + * create an echo event + */ +static int +set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev) +{ + ev->type = SNDRV_SEQ_EVENT_ECHO; + /* echo back to itself */ + snd_seq_oss_fill_addr(dp, ev, dp->addr.client, dp->addr.port); + memcpy(&ev->data, rec, LONG_EVENT_SIZE); + return 0; +} + +/* + * event input callback from ALSA sequencer: + * the echo event is processed here. + */ +int +snd_seq_oss_event_input(struct snd_seq_event *ev, int direct, void *private_data, + int atomic, int hop) +{ + struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data; + union evrec *rec; + + if (ev->type != SNDRV_SEQ_EVENT_ECHO) + return snd_seq_oss_midi_input(ev, direct, private_data); + + if (ev->source.client != dp->cseq) + return 0; /* ignored */ + + rec = (union evrec*)&ev->data; + if (rec->s.code == SEQ_SYNCTIMER) { + /* sync echo back */ + snd_seq_oss_writeq_wakeup(dp->writeq, rec->t.time); + + } else { + /* echo back event */ + if (dp->readq == NULL) + return 0; + snd_seq_oss_readq_put_event(dp->readq, rec); + } + return 0; +} + -- cgit v1.2.3