1 # SPDX-License-Identifier: GPL-2.0-only <<
2 # ALSA soundcard-configuration 1 # ALSA soundcard-configuration
3 config SND_TIMER 2 config SND_TIMER
4 tristate 3 tristate
5 4
6 config SND_PCM 5 config SND_PCM
7 tristate 6 tristate
8 select SND_TIMER if SND_PCM_TIMER 7 select SND_TIMER if SND_PCM_TIMER
9 8
10 config SND_PCM_ELD 9 config SND_PCM_ELD
11 bool 10 bool
12 11
13 config SND_PCM_IEC958 12 config SND_PCM_IEC958
14 bool 13 bool
15 14
16 config SND_DMAENGINE_PCM 15 config SND_DMAENGINE_PCM
17 tristate 16 tristate
18 17
19 config SND_HWDEP 18 config SND_HWDEP
20 tristate 19 tristate
21 20
22 config SND_SEQ_DEVICE <<
23 tristate <<
24 <<
25 config SND_RAWMIDI 21 config SND_RAWMIDI
26 tristate 22 tristate
27 select SND_SEQ_DEVICE if SND_SEQUENCER <<
28 <<
29 config SND_UMP <<
30 tristate <<
31 select SND_RAWMIDI <<
32 <<
33 config SND_UMP_LEGACY_RAWMIDI <<
34 bool "Legacy raw MIDI support for UMP <<
35 depends on SND_UMP <<
36 help <<
37 This option enables the legacy raw M <<
38 When this option is set, an addition <<
39 legacy MIDI 1.0 byte streams is crea <<
40 The device contains 16 substreams co <<
41 <<
42 config SND_CORE_TEST <<
43 tristate "Sound core KUnit test" <<
44 depends on KUNIT <<
45 select SND_PCM <<
46 default KUNIT_ALL_TESTS <<
47 help <<
48 This options enables the sound core <<
49 <<
50 KUnit tests run during boot and outp <<
51 log in TAP format (https://testanyth <<
52 kernel devs running KUnit test harne <<
53 into a production build. <<
54 <<
55 For more information on KUnit and un <<
56 to the KUnit documentation in Docume <<
57 <<
58 23
59 config SND_COMPRESS_OFFLOAD 24 config SND_COMPRESS_OFFLOAD
60 tristate 25 tristate
61 26
>> 27 # To be effective this also requires INPUT - users should say:
>> 28 # select SND_JACK if INPUT=y || INPUT=SND
>> 29 # to avoid having to force INPUT on.
62 config SND_JACK 30 config SND_JACK
63 bool 31 bool
64 32
65 # enable input device support in jack layer !! 33 config SND_SEQUENCER
66 config SND_JACK_INPUT_DEV !! 34 tristate "Sequencer support"
67 bool !! 35 select SND_TIMER
68 depends on SND_JACK !! 36 help
69 default y if INPUT=y || INPUT=SND !! 37 Say Y or M to enable MIDI sequencer and router support. This
>> 38 feature allows routing and enqueueing of MIDI events. Events
>> 39 can be processed at a given time.
>> 40
>> 41 Many programs require this feature, so you should enable it
>> 42 unless you know what you're doing.
>> 43
>> 44 config SND_SEQ_DUMMY
>> 45 tristate "Sequencer dummy client"
>> 46 depends on SND_SEQUENCER
>> 47 help
>> 48 Say Y here to enable the dummy sequencer client. This client
>> 49 is a simple MIDI-through client: all normal input events are
>> 50 redirected to the output port immediately.
>> 51
>> 52 You don't need this unless you want to connect many MIDI
>> 53 devices or applications together.
>> 54
>> 55 To compile this driver as a module, choose M here: the module
>> 56 will be called snd-seq-dummy.
70 57
71 config SND_OSSEMUL 58 config SND_OSSEMUL
72 bool "Enable OSS Emulation" <<
73 select SOUND_OSS_CORE 59 select SOUND_OSS_CORE
74 help !! 60 bool
75 This option enables the build of OSS <<
76 61
77 config SND_MIXER_OSS 62 config SND_MIXER_OSS
78 tristate "OSS Mixer API" 63 tristate "OSS Mixer API"
79 depends on SND_OSSEMUL !! 64 select SND_OSSEMUL
80 help 65 help
81 To enable OSS mixer API emulation (/ 66 To enable OSS mixer API emulation (/dev/mixer*), say Y here
82 and read <file:Documentation/sound/d !! 67 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
83 68
84 Many programs still use the OSS API, 69 Many programs still use the OSS API, so say Y.
85 70
86 To compile this driver as a module, 71 To compile this driver as a module, choose M here: the module
87 will be called snd-mixer-oss. 72 will be called snd-mixer-oss.
88 73
89 config SND_PCM_OSS 74 config SND_PCM_OSS
90 tristate "OSS PCM (digital audio) API" 75 tristate "OSS PCM (digital audio) API"
91 depends on SND_OSSEMUL !! 76 select SND_OSSEMUL
92 select SND_PCM 77 select SND_PCM
93 help 78 help
94 To enable OSS digital audio (PCM) em 79 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
95 here and read <file:Documentation/so !! 80 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
96 81
97 Many programs still use the OSS API, 82 Many programs still use the OSS API, so say Y.
98 83
99 To compile this driver as a module, 84 To compile this driver as a module, choose M here: the module
100 will be called snd-pcm-oss. 85 will be called snd-pcm-oss.
101 86
102 config SND_PCM_OSS_PLUGINS 87 config SND_PCM_OSS_PLUGINS
103 bool "OSS PCM (digital audio) API - In 88 bool "OSS PCM (digital audio) API - Include plugin system"
104 depends on SND_PCM_OSS 89 depends on SND_PCM_OSS
105 default y !! 90 default y
106 help 91 help
107 If you disable this option, the ALSA !! 92 If you disable this option, the ALSA's OSS PCM API will not
108 support conversion of channels, form !! 93 support conversion of channels, formats and rates. It will
109 behave like most of new OSS/Free dri !! 94 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
110 95
111 config SND_PCM_TIMER 96 config SND_PCM_TIMER
112 bool "PCM timer interface" if EXPERT 97 bool "PCM timer interface" if EXPERT
113 default y 98 default y
114 help 99 help
115 If you disable this option, pcm time !! 100 If you disable this option, pcm timer will be inavailable, so
116 those stubs that use pcm timer (e.g. !! 101 those stubs used pcm timer (e.g. dmix, dsnoop & co) may work
117 incorrectly. !! 102 incorrectlly.
118 103
119 For some embedded devices, we may di !! 104 For some embedded device, we may disable it to reduce memory
120 footprint, about 20KB on x86_64 plat 105 footprint, about 20KB on x86_64 platform.
121 106
>> 107 config SND_SEQUENCER_OSS
>> 108 bool "OSS Sequencer API"
>> 109 depends on SND_SEQUENCER
>> 110 select SND_OSSEMUL
>> 111 help
>> 112 Say Y here to enable OSS sequencer emulation (both
>> 113 /dev/sequencer and /dev/music interfaces).
>> 114
>> 115 Many programs still use the OSS API, so say Y.
>> 116
>> 117 If you choose M in "Sequencer support" (SND_SEQUENCER),
>> 118 this will be compiled as a module. The module will be called
>> 119 snd-seq-oss.
>> 120
122 config SND_HRTIMER 121 config SND_HRTIMER
123 tristate "HR-timer backend support" 122 tristate "HR-timer backend support"
124 depends on HIGH_RES_TIMERS 123 depends on HIGH_RES_TIMERS
125 select SND_TIMER 124 select SND_TIMER
126 help 125 help
127 Say Y here to enable HR-timer backen 126 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
128 the hrtimer as a precise timing sour 127 the hrtimer as a precise timing source. The ALSA sequencer code
129 also can use this timing source. 128 also can use this timing source.
130 129
131 To compile this driver as a module, 130 To compile this driver as a module, choose M here: the module
132 will be called snd-hrtimer. 131 will be called snd-hrtimer.
133 132
>> 133 config SND_SEQ_HRTIMER_DEFAULT
>> 134 bool "Use HR-timer as default sequencer timer"
>> 135 depends on SND_HRTIMER && SND_SEQUENCER
>> 136 default y
>> 137 help
>> 138 Say Y here to use the HR-timer backend as the default sequencer
>> 139 timer.
>> 140
>> 141 config SND_RTCTIMER
>> 142 tristate "RTC Timer support"
>> 143 depends on RTC
>> 144 select SND_TIMER
>> 145 help
>> 146 Say Y here to enable RTC timer support for ALSA. ALSA uses
>> 147 the RTC timer as a precise timing source and maps the RTC
>> 148 timer to ALSA's timer interface. The ALSA sequencer code also
>> 149 can use this timing source.
>> 150
>> 151 To compile this driver as a module, choose M here: the module
>> 152 will be called snd-rtctimer.
>> 153
>> 154 Note that this option is exclusive with the new RTC drivers
>> 155 (CONFIG_RTC_CLASS) since this requires the old API.
>> 156
>> 157 config SND_SEQ_RTCTIMER_DEFAULT
>> 158 bool "Use RTC as default sequencer timer"
>> 159 depends on SND_RTCTIMER && SND_SEQUENCER
>> 160 depends on !SND_SEQ_HRTIMER_DEFAULT
>> 161 default y
>> 162 help
>> 163 Say Y here to use the RTC timer as the default sequencer
>> 164 timer. This is strongly recommended because it ensures
>> 165 precise MIDI timing even when the system timer runs at less
>> 166 than 1000 Hz.
>> 167
>> 168 If in doubt, say Y.
>> 169
134 config SND_DYNAMIC_MINORS 170 config SND_DYNAMIC_MINORS
135 bool "Dynamic device file minor number 171 bool "Dynamic device file minor numbers"
136 help 172 help
137 If you say Y here, the minor numbers 173 If you say Y here, the minor numbers of ALSA device files in
138 /dev/snd/ are allocated dynamically. 174 /dev/snd/ are allocated dynamically. This allows you to have
139 more than 8 sound cards, but require 175 more than 8 sound cards, but requires a dynamic device file
140 system like udev. 176 system like udev.
141 177
142 If you are unsure about this, say N 178 If you are unsure about this, say N here.
143 179
144 config SND_MAX_CARDS 180 config SND_MAX_CARDS
145 int "Max number of sound cards" 181 int "Max number of sound cards"
146 range 4 256 182 range 4 256
147 default 32 183 default 32
148 depends on SND_DYNAMIC_MINORS 184 depends on SND_DYNAMIC_MINORS
149 help 185 help
150 Specify the max number of sound card 186 Specify the max number of sound cards that can be assigned
151 on a single machine. 187 on a single machine.
152 188
153 config SND_SUPPORT_OLD_API 189 config SND_SUPPORT_OLD_API
154 bool "Support old ALSA API" 190 bool "Support old ALSA API"
155 default y 191 default y
156 help 192 help
157 Say Y here to support the obsolete A 193 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
158 or older). 194 or older).
159 195
160 config SND_PROC_FS 196 config SND_PROC_FS
161 bool "Sound Proc FS Support" if EXPERT !! 197 bool "Sound Proc FS Support" if EXPERT
162 depends on PROC_FS !! 198 depends on PROC_FS
163 default y !! 199 default y
164 help !! 200 help
165 Say 'N' to disable Sound proc FS, wh !! 201 Say 'N' to disable Sound proc FS, which may reduce code size about
166 9KB on x86_64 platform. !! 202 9KB on x86_64 platform.
167 If unsure say Y. !! 203 If unsure say Y.
168 204
169 config SND_VERBOSE_PROCFS 205 config SND_VERBOSE_PROCFS
170 bool "Verbose procfs contents" 206 bool "Verbose procfs contents"
171 depends on SND_PROC_FS 207 depends on SND_PROC_FS
172 default y 208 default y
173 help 209 help
174 Say Y here to include code for verbo 210 Say Y here to include code for verbose procfs contents (provides
175 useful information to developers whe !! 211 useful information to developers when a problem occurs). On the
176 other side, it makes the ALSA subsys !! 212 other side, it makes the ALSA subsystem larger.
177 213
178 config SND_CTL_FAST_LOOKUP !! 214 config SND_VERBOSE_PRINTK
179 bool "Fast lookup of control elements" !! 215 bool "Verbose printk"
180 default y <<
181 select XARRAY_MULTI <<
182 help 216 help
183 This option enables the faster looku !! 217 Say Y here to enable verbose log messages. These messages
184 It will consume more memory because !! 218 will help to identify source file and position containing
185 If you want to choose the memory foo !! 219 printed messages.
186 inevitably, turn this off. !! 220
>> 221 You don't need this unless you're debugging ALSA.
187 222
188 config SND_DEBUG 223 config SND_DEBUG
189 bool "Debug" 224 bool "Debug"
190 help 225 help
191 Say Y here to enable ALSA debug code 226 Say Y here to enable ALSA debug code.
192 227
193 config SND_DEBUG_VERBOSE 228 config SND_DEBUG_VERBOSE
194 bool "More verbose debug" 229 bool "More verbose debug"
195 depends on SND_DEBUG 230 depends on SND_DEBUG
196 help 231 help
197 Say Y here to enable extra-verbose d 232 Say Y here to enable extra-verbose debugging messages.
198 !! 233
199 Let me repeat: it enables EXTRA-VERB 234 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
200 So, say Y only if you are ready to b 235 So, say Y only if you are ready to be annoyed.
201 236
202 config SND_PCM_XRUN_DEBUG 237 config SND_PCM_XRUN_DEBUG
203 bool "Enable PCM ring buffer overrun/u 238 bool "Enable PCM ring buffer overrun/underrun debugging"
204 default n 239 default n
205 depends on SND_DEBUG && SND_VERBOSE_PR 240 depends on SND_DEBUG && SND_VERBOSE_PROCFS
206 help 241 help
207 Say Y to enable the PCM ring buffer 242 Say Y to enable the PCM ring buffer overrun/underrun debugging.
208 It is usually not required, but if y 243 It is usually not required, but if you have trouble with
209 sound clicking when system is loaded 244 sound clicking when system is loaded, it may help to determine
210 the process or driver which causes t 245 the process or driver which causes the scheduling gaps.
211 246
212 config SND_CTL_INPUT_VALIDATION <<
213 bool "Validate input data to control A <<
214 help <<
215 Say Y to enable the additional valid <<
216 each control element, including the <<
217 An error is returned from ALSA core <<
218 passing to the driver. This is a ki <<
219 that have no proper error checks, at <<
220 performance overhead. <<
221 <<
222 config SND_CTL_DEBUG <<
223 bool "Enable debugging feature for con <<
224 depends on SND_DEBUG <<
225 help <<
226 Say Y to enable the debugging featur <<
227 It performs the additional sanity-ch <<
228 read access, such as whether the val <<
229 are in the proper ranges or the chec <<
230 out-of-array areas. The error is pr <<
231 such unexpected values. <<
232 When you develop a driver that deals <<
233 strongly recommended to try this one <<
234 any relevant errors or not. <<
235 <<
236 config SND_JACK_INJECTION_DEBUG <<
237 bool "Sound jack injection interface v <<
238 depends on SND_JACK && SND_DEBUG && DE <<
239 help <<
240 This option can be used to enable or <<
241 software injection. <<
242 Say Y if you are debugging via jack <<
243 If unsure select "N". <<
244 <<
245 config SND_UTIMER <<
246 bool "Enable support for userspace-con <<
247 depends on SND_TIMER <<
248 help <<
249 Say Y to enable the support of users <<
250 timers are purely virtual, and they <<
251 from userspace. They could be quite <<
252 sound timing with userspace applicat <<
253 data through snd-aloop). <<
254 <<
255 config SND_VMASTER 247 config SND_VMASTER
256 bool 248 bool
257 249
258 config SND_DMA_SGBUF 250 config SND_DMA_SGBUF
259 def_bool y 251 def_bool y
260 depends on X86 252 depends on X86
261 <<
262 config SND_CTL_LED <<
263 tristate <<
264 select NEW_LEDS if SND_CTL_LED <<
265 select LEDS_TRIGGERS if SND_CTL_LED <<
266 253
267 source "sound/core/seq/Kconfig" 254 source "sound/core/seq/Kconfig"
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