kernel/linux.git/sound/core/Kconfig, branch linux-7.1.y

ALSA: Do not build obsolete API

2025-12-07T12:15:59+00:00

ALSA 0.9.0-rc3 is from 2002, 23 years old. Signed-off-by: David Heidelberg Reviewed-by: Janusz Krzysztofik Reviewed-by: Christophe Leroy (CS GROUP) Acked-by: Christophe Leroy (CS GROUP) Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20251203-old-alsa-v1-1-ac80704f52c3@ixit.cz

ALSA: compress_offload: introduce accel operation mode

2024-10-25T08:53:20+00:00

There is a requirement to expose the audio hardware that accelerates various tasks for user space such as sample rate converters, compressed stream decoders, etc. This is description for the API extension for the compress ALSA API which is able to handle "tasks" that are not bound to real-time operations and allows for the serialization of operations. For details, refer to "compress-accel.rst" document. Cc: Mark Brown Cc: Shengjiu Wang Cc: Nicolas Dufresne Cc: Amadeusz Sławiński Cc: Pierre-Louis Bossart Cc: Vinod Koul Signed-off-by: Jaroslav Kysela Reviewed-by: Amadeusz Sławiński Tested-by: Shengjiu Wang Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20241002093904.1809799-1-perex@perex.cz

ALSA: timer: Introduce virtual userspace-driven timers

2024-08-18T07:55:54+00:00

Implement two ioctl calls in order to support virtual userspace-driven ALSA timers. The first ioctl is SNDRV_TIMER_IOCTL_CREATE, which gets the snd_timer_uinfo struct as a parameter and puts a file descriptor of a virtual timer into the `fd` field of the snd_timer_unfo structure. It also updates the `id` field of the snd_timer_uinfo struct, which provides a unique identifier for the timer (basically, the subdevice number which can be used when creating timer instances). This patch also introduces a tiny id allocator for the userspace-driven timers, which guarantees that we don't have more than 128 of them in the system. Another ioctl is SNDRV_TIMER_IOCTL_TRIGGER, which allows us to trigger the virtual timer (and calls snd_timer_interrupt for the timer under the hood), causing all of the timer instances binded to this timer to execute their callbacks. The maximum amount of ticks available for the timer is 1 for the sake of simplicity of the userspace API. 'start', 'stop', 'open' and 'close' callbacks for the userspace-driven timers are empty since we don't really do any hardware initialization here. Suggested-by: Axel Holzinger Signed-off-by: Ivan Orlov Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20240813120701.171743-4-ivan.orlov0322@gmail.com

ALSA: core: Drop snd_print stuff and co

2024-08-08T05:49:47+00:00

Now that all users of snd_print*() are gone, let's drop the functions completely. This also makes CONFIG_SND_VERBOSE_PRINTK redundant, and it's dropped, too. Reviewed-by: Jaroslav Kysela Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20240807133452.9424-55-tiwai@suse.de

ALSA: control-led: Integrate mute led trigger

2024-03-28T10:39:50+00:00

This driver is the only one calling ledtrig_audio_set(), therefore the LED audio trigger isn't usable standalone. So it makes sense to fully integrate LED audio triger handling here. The module aliases ensure that the driver is auto-loaded (if built as module) if a LED device has one of the two audio triggers as default trigger. In addition disable building the old audio mute LED trigger. Signed-off-by: Heiner Kallweit Reviewed-by: Takashi Iwai Link: https://lore.kernel.org/r/107634e6-d9ad-4a9f-881d-1eb72ea1a5a7@gmail.com Signed-off-by: Lee Jones

ALSA: core: Fix dependencies for SND_CORE_TEST

2024-02-02T08:16:46+00:00

Select CONFIG_SND_PCM when enabling CONFIG_SND_CORE_TEST, as the test uses symbols from 'pcm_misc.c'. Fixes: 3e39acf56ede ("ALSA: core: Add sound core KUnit test") Signed-off-by: Ivan Orlov Link: https://lore.kernel.org/r/20240201221122.16627-1-ivan.orlov0322@gmail.com Signed-off-by: Takashi Iwai

ALSA: core: Add sound core KUnit test

2024-01-30T13:11:37+00:00

At the moment, we have a decent amount of integration tests (selftests) covering different aspects of the sound subsystem. However, a lot of of sound-related in-kernel functions remains uncovered. This patch introduces the KUnit test for the core part of the sound subsystem. It includes 10 test cases: - Coverage of the format-related inline functions from 'pcm.h' header file: snd_pcm_format_physical_width, snd_pcm_format_width, snd_pcm_format_signed, test_format_endianness - Coverage of the available bytes counting functions from 'pcm.h' header: snd_pcm_capture_avail, snd_pcm_playback_avail - Coverage of functions from pcm_misc: snd_pcm_format_set_silence, snd_pcm_format_name - Coverage of card-related functions from init.c: snd_card_set_id, snd_component_add This patch depends on the previous patches in this patch series as they contain fix for the bug, which was found during the test development. Without them, the test doesn't pass. Signed-off-by: Ivan Orlov Link: https://lore.kernel.org/r/20240125223522.1122765-3-ivan.orlov0322@gmail.com Signed-off-by: Takashi Iwai

ALSA: ump: Add legacy raw MIDI support

2023-05-23T10:11:09+00:00

This patch extends the UMP core code to support the legacy MIDI 1.0 rawmidi devices. When the new kconfig CONFIG_SND_UMP_LEGACY_RAWMIDI is set, the UMP core allows to attach an additional rawmidi device for each UMP Endpoint. The rawmidi device contains 16 substreams where each substream corresponds to a UMP Group belonging to the EP. The device reads/writes the legacy MIDI 1.0 byte streams and translates from/to UMP packets. The legacy rawmidi devices are exclusive with the UMP rawmidi devices, hence both of them can't be opened at the same time unless the UMP rawmidi is opened in APPEND mode. Reviewed-by: Jaroslav Kysela Link: https://lore.kernel.org/r/20230523075358.9672-15-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: rawmidi: UMP support

2023-05-23T10:10:54+00:00

This patch adds the support helpers for UMP (Universal MIDI Packet) in ALSA core. The basic design is that a rawmidi instance is assigned to each UMP Endpoint. A UMP Endpoint provides a UMP stream, typically bidirectional (but can be also uni-directional, too), which may hold up to 16 UMP Groups, where each UMP (input/output) Group corresponds to the traditional MIDI I/O Endpoint. Additionally, the ALSA UMP abstraction provides the multiple UMP Blocks that can be assigned to each UMP Endpoint. A UMP Block is a metadata to hold the UMP Group clusters, and can represent the functions assigned to each UMP Group. A typical implementation of UMP Block is the Group Terminal Blocks of USB MIDI 2.0 specification. For distinguishing from the legacy byte-stream MIDI device, a new device "umpC*D*" will be created, instead of the standard (MIDI 1.0) devices "midiC*D*". The UMP instance can be identified by the new rawmidi info bit SNDRV_RAWMIDI_INFO_UMP, too. A UMP rawmidi device reads/writes only in 4-bytes words alignment, stored in CPU native endianness. The transmit and receive functions take care of the input/out data alignment, and may return zero or aligned size, and the params ioctl may return -EINVAL when the given input/output buffer size isn't aligned. A few new UMP-specific ioctls are added for obtaining the new UMP endpoint and block information. As of this commit, no ALSA sequencer instance is attached to UMP devices yet. They will be supported by later patches. Along with those changes, the protocol version for rawmidi is bumped to 2.0.3. Reviewed-by: Jaroslav Kysela Link: https://lore.kernel.org/r/20230523075358.9672-4-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: control: Add input validation

2022-06-15T05:45:28+00:00

This patch adds a new feature to enable the validation of input data to control elements in the ALSA core side. When CONFIG_SND_CTL_INPUT_VALIDATION is set, ALSA core verifies whether the each input value via control API is in the defined ranges, also checks whether it's aligned to the defined steps. If an invalid value is detected, ALSA core returns -EINVAL error immediately without passing further to the driver's callback. So this is a kind of hardening for (badly written) drivers that have no proper error checks, at the cost of a slight performance overhead. Technically seen, this reuses a part of the existing validation code for CONFIG_SND_CTL_DEBUG case with a slight modification to suppress error prints for the input validation. Link: https://lore.kernel.org/r/20220609120219.3937-5-tiwai@suse.de Signed-off-by: Takashi Iwai