# SPDX-License-Identifier: GPL-2.0-only
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# ALSA soundcard-configuration
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config SND_TIMER
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tristate
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config SND_PCM
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tristate
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select SND_TIMER if SND_PCM_TIMER
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config SND_PCM_ELD
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bool
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config SND_PCM_IEC958
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bool
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config SND_DMAENGINE_PCM
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tristate
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config SND_HWDEP
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tristate
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config SND_SEQ_DEVICE
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tristate
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config SND_RAWMIDI
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tristate
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select SND_SEQ_DEVICE if SND_SEQUENCER != n
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config SND_COMPRESS_OFFLOAD
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tristate
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config SND_JACK
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bool
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# enable input device support in jack layer
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config SND_JACK_INPUT_DEV
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bool
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depends on SND_JACK
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default y if INPUT=y || INPUT=SND
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config SND_OSSEMUL
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bool "Enable OSS Emulation"
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select SOUND_OSS_CORE
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help
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This option enables the build of OSS emulation layer.
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config SND_MIXER_OSS
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tristate "OSS Mixer API"
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depends on SND_OSSEMUL
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help
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To enable OSS mixer API emulation (/dev/mixer*), say Y here
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and read <file:Documentation/sound/designs/oss-emulation.rst>.
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Many programs still use the OSS API, so say Y.
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To compile this driver as a module, choose M here: the module
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will be called snd-mixer-oss.
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config SND_PCM_OSS
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tristate "OSS PCM (digital audio) API"
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depends on SND_OSSEMUL
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select SND_PCM
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help
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To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
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here and read <file:Documentation/sound/designs/oss-emulation.rst>.
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Many programs still use the OSS API, so say Y.
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To compile this driver as a module, choose M here: the module
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will be called snd-pcm-oss.
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config SND_PCM_OSS_PLUGINS
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bool "OSS PCM (digital audio) API - Include plugin system"
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depends on SND_PCM_OSS
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default y
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help
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If you disable this option, the ALSA's OSS PCM API will not
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support conversion of channels, formats and rates. It will
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behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
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config SND_PCM_TIMER
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bool "PCM timer interface" if EXPERT
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default y
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help
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If you disable this option, pcm timer will be unavailable, so
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those stubs that use pcm timer (e.g. dmix, dsnoop & co) may work
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incorrectlly.
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For some embedded devices, we may disable it to reduce memory
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footprint, about 20KB on x86_64 platform.
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config SND_HRTIMER
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tristate "HR-timer backend support"
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depends on HIGH_RES_TIMERS
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select SND_TIMER
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help
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Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
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the hrtimer as a precise timing source. The ALSA sequencer code
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also can use this timing source.
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To compile this driver as a module, choose M here: the module
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will be called snd-hrtimer.
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config SND_DYNAMIC_MINORS
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bool "Dynamic device file minor numbers"
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help
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If you say Y here, the minor numbers of ALSA device files in
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/dev/snd/ are allocated dynamically. This allows you to have
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more than 8 sound cards, but requires a dynamic device file
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system like udev.
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If you are unsure about this, say N here.
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config SND_MAX_CARDS
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int "Max number of sound cards"
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range 4 256
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default 32
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depends on SND_DYNAMIC_MINORS
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help
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Specify the max number of sound cards that can be assigned
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on a single machine.
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config SND_SUPPORT_OLD_API
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bool "Support old ALSA API"
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default y
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help
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Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
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or older).
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config SND_PROC_FS
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bool "Sound Proc FS Support" if EXPERT
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depends on PROC_FS
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default y
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help
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Say 'N' to disable Sound proc FS, which may reduce code size about
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9KB on x86_64 platform.
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If unsure say Y.
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config SND_VERBOSE_PROCFS
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bool "Verbose procfs contents"
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depends on SND_PROC_FS
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default y
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help
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Say Y here to include code for verbose procfs contents (provides
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useful information to developers when a problem occurs). On the
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other side, it makes the ALSA subsystem larger.
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config SND_VERBOSE_PRINTK
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bool "Verbose printk"
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help
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Say Y here to enable verbose log messages. These messages
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will help to identify source file and position containing
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printed messages.
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You don't need this unless you're debugging ALSA.
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config SND_DEBUG
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bool "Debug"
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help
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Say Y here to enable ALSA debug code.
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config SND_DEBUG_VERBOSE
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bool "More verbose debug"
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depends on SND_DEBUG
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help
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Say Y here to enable extra-verbose debugging messages.
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Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
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So, say Y only if you are ready to be annoyed.
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config SND_PCM_XRUN_DEBUG
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bool "Enable PCM ring buffer overrun/underrun debugging"
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default n
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depends on SND_DEBUG && SND_VERBOSE_PROCFS
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help
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Say Y to enable the PCM ring buffer overrun/underrun debugging.
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It is usually not required, but if you have trouble with
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sound clicking when system is loaded, it may help to determine
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the process or driver which causes the scheduling gaps.
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config SND_CTL_VALIDATION
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bool "Perform sanity-checks for each control element access"
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depends on SND_DEBUG
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help
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Say Y to enable the additional validation of each control element
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access, including sanity-checks like whether the values returned
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from the driver are in the proper ranges or the check of the invalid
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access at out-of-array areas.
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config SND_VMASTER
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bool
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config SND_DMA_SGBUF
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def_bool y
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depends on X86
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source "sound/core/seq/Kconfig"
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