1# SPDX-License-Identifier: GPL-2.0-only 2# ALSA soundcard-configuration 3config SND_TIMER 4 tristate 5 6config SND_PCM 7 tristate 8 select SND_TIMER if SND_PCM_TIMER 9 10config SND_PCM_ELD 11 bool 12 13config SND_PCM_IEC958 14 bool 15 16config SND_DMAENGINE_PCM 17 tristate 18 19config SND_HWDEP 20 tristate 21 22config SND_SEQ_DEVICE 23 tristate 24 25config SND_RAWMIDI 26 tristate 27 select SND_SEQ_DEVICE if SND_SEQUENCER != n 28 29config SND_COMPRESS_OFFLOAD 30 tristate 31 32config SND_JACK 33 bool 34 35# enable input device support in jack layer 36config SND_JACK_INPUT_DEV 37 bool 38 depends on SND_JACK 39 default y if INPUT=y || INPUT=SND 40 41config SND_OSSEMUL 42 bool "Enable OSS Emulation" 43 select SOUND_OSS_CORE 44 help 45 This option enables the build of OSS emulation layer. 46 47config SND_MIXER_OSS 48 tristate "OSS Mixer API" 49 depends on SND_OSSEMUL 50 help 51 To enable OSS mixer API emulation (/dev/mixer*), say Y here 52 and read <file:Documentation/sound/designs/oss-emulation.rst>. 53 54 Many programs still use the OSS API, so say Y. 55 56 To compile this driver as a module, choose M here: the module 57 will be called snd-mixer-oss. 58 59config SND_PCM_OSS 60 tristate "OSS PCM (digital audio) API" 61 depends on SND_OSSEMUL 62 select SND_PCM 63 help 64 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y 65 here and read <file:Documentation/sound/designs/oss-emulation.rst>. 66 67 Many programs still use the OSS API, so say Y. 68 69 To compile this driver as a module, choose M here: the module 70 will be called snd-pcm-oss. 71 72config SND_PCM_OSS_PLUGINS 73 bool "OSS PCM (digital audio) API - Include plugin system" 74 depends on SND_PCM_OSS 75 default y 76 help 77 If you disable this option, the ALSA's OSS PCM API will not 78 support conversion of channels, formats and rates. It will 79 behave like most of new OSS/Free drivers in 2.4/2.6 kernels. 80 81config SND_PCM_TIMER 82 bool "PCM timer interface" if EXPERT 83 default y 84 help 85 If you disable this option, pcm timer will be unavailable, so 86 those stubs that use pcm timer (e.g. dmix, dsnoop & co) may work 87 incorrectlly. 88 89 For some embedded devices, we may disable it to reduce memory 90 footprint, about 20KB on x86_64 platform. 91 92config SND_HRTIMER 93 tristate "HR-timer backend support" 94 depends on HIGH_RES_TIMERS 95 select SND_TIMER 96 help 97 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses 98 the hrtimer as a precise timing source. The ALSA sequencer code 99 also can use this timing source. 100 101 To compile this driver as a module, choose M here: the module 102 will be called snd-hrtimer. 103 104config SND_DYNAMIC_MINORS 105 bool "Dynamic device file minor numbers" 106 help 107 If you say Y here, the minor numbers of ALSA device files in 108 /dev/snd/ are allocated dynamically. This allows you to have 109 more than 8 sound cards, but requires a dynamic device file 110 system like udev. 111 112 If you are unsure about this, say N here. 113 114config SND_MAX_CARDS 115 int "Max number of sound cards" 116 range 4 256 117 default 32 118 depends on SND_DYNAMIC_MINORS 119 help 120 Specify the max number of sound cards that can be assigned 121 on a single machine. 122 123config SND_SUPPORT_OLD_API 124 bool "Support old ALSA API" 125 default y 126 help 127 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3 128 or older). 129 130config SND_PROC_FS 131 bool "Sound Proc FS Support" if EXPERT 132 depends on PROC_FS 133 default y 134 help 135 Say 'N' to disable Sound proc FS, which may reduce code size about 136 9KB on x86_64 platform. 137 If unsure say Y. 138 139config SND_VERBOSE_PROCFS 140 bool "Verbose procfs contents" 141 depends on SND_PROC_FS 142 default y 143 help 144 Say Y here to include code for verbose procfs contents (provides 145 useful information to developers when a problem occurs). On the 146 other side, it makes the ALSA subsystem larger. 147 148config SND_VERBOSE_PRINTK 149 bool "Verbose printk" 150 help 151 Say Y here to enable verbose log messages. These messages 152 will help to identify source file and position containing 153 printed messages. 154 155 You don't need this unless you're debugging ALSA. 156 157config SND_DEBUG 158 bool "Debug" 159 help 160 Say Y here to enable ALSA debug code. 161 162config SND_DEBUG_VERBOSE 163 bool "More verbose debug" 164 depends on SND_DEBUG 165 help 166 Say Y here to enable extra-verbose debugging messages. 167 168 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages. 169 So, say Y only if you are ready to be annoyed. 170 171config SND_PCM_XRUN_DEBUG 172 bool "Enable PCM ring buffer overrun/underrun debugging" 173 default n 174 depends on SND_DEBUG && SND_VERBOSE_PROCFS 175 help 176 Say Y to enable the PCM ring buffer overrun/underrun debugging. 177 It is usually not required, but if you have trouble with 178 sound clicking when system is loaded, it may help to determine 179 the process or driver which causes the scheduling gaps. 180 181config SND_CTL_VALIDATION 182 bool "Perform sanity-checks for each control element access" 183 depends on SND_DEBUG 184 help 185 Say Y to enable the additional validation of each control element 186 access, including sanity-checks like whether the values returned 187 from the driver are in the proper ranges or the check of the invalid 188 access at out-of-array areas. 189 190config SND_VMASTER 191 bool 192 193config SND_DMA_SGBUF 194 def_bool y 195 depends on X86 196 197source "sound/core/seq/Kconfig" 198