1# ALSA soundcard-configuration 2config SND_TIMER 3 tristate 4 5config SND_PCM 6 tristate 7 select SND_TIMER if SND_PCM_TIMER 8 9config SND_PCM_ELD 10 bool 11 12config SND_PCM_IEC958 13 bool 14 15config SND_DMAENGINE_PCM 16 tristate 17 18config SND_HWDEP 19 tristate 20 21config SND_RAWMIDI 22 tristate 23 24config SND_COMPRESS_OFFLOAD 25 tristate 26 27config SND_JACK 28 bool 29 30# enable input device support in jack layer 31config SND_JACK_INPUT_DEV 32 bool 33 depends on SND_JACK 34 default y if INPUT=y || INPUT=SND 35 36config SND_SEQUENCER 37 tristate "Sequencer support" 38 select SND_TIMER 39 help 40 Say Y or M to enable MIDI sequencer and router support. This 41 feature allows routing and enqueueing of MIDI events. Events 42 can be processed at a given time. 43 44 Many programs require this feature, so you should enable it 45 unless you know what you're doing. 46 47config SND_SEQ_DUMMY 48 tristate "Sequencer dummy client" 49 depends on SND_SEQUENCER 50 help 51 Say Y here to enable the dummy sequencer client. This client 52 is a simple MIDI-through client: all normal input events are 53 redirected to the output port immediately. 54 55 You don't need this unless you want to connect many MIDI 56 devices or applications together. 57 58 To compile this driver as a module, choose M here: the module 59 will be called snd-seq-dummy. 60 61config SND_OSSEMUL 62 select SOUND_OSS_CORE 63 bool 64 65config SND_MIXER_OSS 66 tristate "OSS Mixer API" 67 select SND_OSSEMUL 68 help 69 To enable OSS mixer API emulation (/dev/mixer*), say Y here 70 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>. 71 72 Many programs still use the OSS API, so say Y. 73 74 To compile this driver as a module, choose M here: the module 75 will be called snd-mixer-oss. 76 77config SND_PCM_OSS 78 tristate "OSS PCM (digital audio) API" 79 select SND_OSSEMUL 80 select SND_PCM 81 help 82 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y 83 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>. 84 85 Many programs still use the OSS API, so say Y. 86 87 To compile this driver as a module, choose M here: the module 88 will be called snd-pcm-oss. 89 90config SND_PCM_OSS_PLUGINS 91 bool "OSS PCM (digital audio) API - Include plugin system" 92 depends on SND_PCM_OSS 93 default y 94 help 95 If you disable this option, the ALSA's OSS PCM API will not 96 support conversion of channels, formats and rates. It will 97 behave like most of new OSS/Free drivers in 2.4/2.6 kernels. 98 99config SND_PCM_TIMER 100 bool "PCM timer interface" if EXPERT 101 default y 102 help 103 If you disable this option, pcm timer will be unavailable, so 104 those stubs that use pcm timer (e.g. dmix, dsnoop & co) may work 105 incorrectlly. 106 107 For some embedded devices, we may disable it to reduce memory 108 footprint, about 20KB on x86_64 platform. 109 110config SND_SEQUENCER_OSS 111 bool "OSS Sequencer API" 112 depends on SND_SEQUENCER 113 select SND_OSSEMUL 114 help 115 Say Y here to enable OSS sequencer emulation (both 116 /dev/sequencer and /dev/music interfaces). 117 118 Many programs still use the OSS API, so say Y. 119 120 If you choose M in "Sequencer support" (SND_SEQUENCER), 121 this will be compiled as a module. The module will be called 122 snd-seq-oss. 123 124config SND_HRTIMER 125 tristate "HR-timer backend support" 126 depends on HIGH_RES_TIMERS 127 select SND_TIMER 128 help 129 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses 130 the hrtimer as a precise timing source. The ALSA sequencer code 131 also can use this timing source. 132 133 To compile this driver as a module, choose M here: the module 134 will be called snd-hrtimer. 135 136config SND_SEQ_HRTIMER_DEFAULT 137 bool "Use HR-timer as default sequencer timer" 138 depends on SND_HRTIMER && SND_SEQUENCER 139 default y 140 help 141 Say Y here to use the HR-timer backend as the default sequencer 142 timer. 143 144config SND_RTCTIMER 145 tristate "RTC Timer support" 146 depends on RTC 147 select SND_TIMER 148 help 149 Say Y here to enable RTC timer support for ALSA. ALSA uses 150 the RTC timer as a precise timing source and maps the RTC 151 timer to ALSA's timer interface. The ALSA sequencer code also 152 can use this timing source. 153 154 To compile this driver as a module, choose M here: the module 155 will be called snd-rtctimer. 156 157 Note that this option is exclusive with the new RTC drivers 158 (CONFIG_RTC_CLASS) since this requires the old API. 159 160config SND_SEQ_RTCTIMER_DEFAULT 161 bool "Use RTC as default sequencer timer" 162 depends on SND_RTCTIMER && SND_SEQUENCER 163 depends on !SND_SEQ_HRTIMER_DEFAULT 164 default y 165 help 166 Say Y here to use the RTC timer as the default sequencer 167 timer. This is strongly recommended because it ensures 168 precise MIDI timing even when the system timer runs at less 169 than 1000 Hz. 170 171 If in doubt, say Y. 172 173config SND_DYNAMIC_MINORS 174 bool "Dynamic device file minor numbers" 175 help 176 If you say Y here, the minor numbers of ALSA device files in 177 /dev/snd/ are allocated dynamically. This allows you to have 178 more than 8 sound cards, but requires a dynamic device file 179 system like udev. 180 181 If you are unsure about this, say N here. 182 183config SND_MAX_CARDS 184 int "Max number of sound cards" 185 range 4 256 186 default 32 187 depends on SND_DYNAMIC_MINORS 188 help 189 Specify the max number of sound cards that can be assigned 190 on a single machine. 191 192config SND_SUPPORT_OLD_API 193 bool "Support old ALSA API" 194 default y 195 help 196 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3 197 or older). 198 199config SND_PROC_FS 200 bool "Sound Proc FS Support" if EXPERT 201 depends on PROC_FS 202 default y 203 help 204 Say 'N' to disable Sound proc FS, which may reduce code size about 205 9KB on x86_64 platform. 206 If unsure say Y. 207 208config SND_VERBOSE_PROCFS 209 bool "Verbose procfs contents" 210 depends on SND_PROC_FS 211 default y 212 help 213 Say Y here to include code for verbose procfs contents (provides 214 useful information to developers when a problem occurs). On the 215 other side, it makes the ALSA subsystem larger. 216 217config SND_VERBOSE_PRINTK 218 bool "Verbose printk" 219 help 220 Say Y here to enable verbose log messages. These messages 221 will help to identify source file and position containing 222 printed messages. 223 224 You don't need this unless you're debugging ALSA. 225 226config SND_DEBUG 227 bool "Debug" 228 help 229 Say Y here to enable ALSA debug code. 230 231config SND_DEBUG_VERBOSE 232 bool "More verbose debug" 233 depends on SND_DEBUG 234 help 235 Say Y here to enable extra-verbose debugging messages. 236 237 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages. 238 So, say Y only if you are ready to be annoyed. 239 240config SND_PCM_XRUN_DEBUG 241 bool "Enable PCM ring buffer overrun/underrun debugging" 242 default n 243 depends on SND_DEBUG && SND_VERBOSE_PROCFS 244 help 245 Say Y to enable the PCM ring buffer overrun/underrun debugging. 246 It is usually not required, but if you have trouble with 247 sound clicking when system is loaded, it may help to determine 248 the process or driver which causes the scheduling gaps. 249 250config SND_VMASTER 251 bool 252 253config SND_DMA_SGBUF 254 def_bool y 255 depends on X86 256 257source "sound/core/seq/Kconfig" 258