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 21 config SND_SEQ_DEVICE
23 tristate 22 tristate
24 23
25 config SND_RAWMIDI 24 config SND_RAWMIDI
26 tristate 25 tristate
27 select SND_SEQ_DEVICE if SND_SEQUENCER 26 select SND_SEQ_DEVICE if SND_SEQUENCER != n
28 27
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 <<
59 config SND_COMPRESS_OFFLOAD 28 config SND_COMPRESS_OFFLOAD
60 tristate 29 tristate
61 30
62 config SND_JACK 31 config SND_JACK
63 bool 32 bool
64 33
65 # enable input device support in jack layer 34 # enable input device support in jack layer
66 config SND_JACK_INPUT_DEV 35 config SND_JACK_INPUT_DEV
67 bool 36 bool
68 depends on SND_JACK 37 depends on SND_JACK
69 default y if INPUT=y || INPUT=SND 38 default y if INPUT=y || INPUT=SND
70 39
71 config SND_OSSEMUL 40 config SND_OSSEMUL
72 bool "Enable OSS Emulation" 41 bool "Enable OSS Emulation"
73 select SOUND_OSS_CORE 42 select SOUND_OSS_CORE
74 help 43 help
75 This option enables the build of OSS 44 This option enables the build of OSS emulation layer.
76 45
77 config SND_MIXER_OSS 46 config SND_MIXER_OSS
78 tristate "OSS Mixer API" 47 tristate "OSS Mixer API"
79 depends on SND_OSSEMUL 48 depends on SND_OSSEMUL
80 help 49 help
81 To enable OSS mixer API emulation (/ 50 To enable OSS mixer API emulation (/dev/mixer*), say Y here
82 and read <file:Documentation/sound/d 51 and read <file:Documentation/sound/designs/oss-emulation.rst>.
83 52
84 Many programs still use the OSS API, 53 Many programs still use the OSS API, so say Y.
85 54
86 To compile this driver as a module, 55 To compile this driver as a module, choose M here: the module
87 will be called snd-mixer-oss. 56 will be called snd-mixer-oss.
88 57
89 config SND_PCM_OSS 58 config SND_PCM_OSS
90 tristate "OSS PCM (digital audio) API" 59 tristate "OSS PCM (digital audio) API"
91 depends on SND_OSSEMUL 60 depends on SND_OSSEMUL
92 select SND_PCM 61 select SND_PCM
93 help 62 help
94 To enable OSS digital audio (PCM) em 63 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
95 here and read <file:Documentation/so 64 here and read <file:Documentation/sound/designs/oss-emulation.rst>.
96 65
97 Many programs still use the OSS API, 66 Many programs still use the OSS API, so say Y.
98 67
99 To compile this driver as a module, 68 To compile this driver as a module, choose M here: the module
100 will be called snd-pcm-oss. 69 will be called snd-pcm-oss.
101 70
102 config SND_PCM_OSS_PLUGINS 71 config SND_PCM_OSS_PLUGINS
103 bool "OSS PCM (digital audio) API - In 72 bool "OSS PCM (digital audio) API - Include plugin system"
104 depends on SND_PCM_OSS 73 depends on SND_PCM_OSS
105 default y !! 74 default y
106 help 75 help
107 If you disable this option, the ALSA !! 76 If you disable this option, the ALSA's OSS PCM API will not
108 support conversion of channels, form !! 77 support conversion of channels, formats and rates. It will
109 behave like most of new OSS/Free dri !! 78 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
110 79
111 config SND_PCM_TIMER 80 config SND_PCM_TIMER
112 bool "PCM timer interface" if EXPERT 81 bool "PCM timer interface" if EXPERT
113 default y 82 default y
114 help 83 help
115 If you disable this option, pcm time 84 If you disable this option, pcm timer will be unavailable, so
116 those stubs that use pcm timer (e.g. 85 those stubs that use pcm timer (e.g. dmix, dsnoop & co) may work
117 incorrectly. !! 86 incorrectlly.
118 87
119 For some embedded devices, we may di 88 For some embedded devices, we may disable it to reduce memory
120 footprint, about 20KB on x86_64 plat 89 footprint, about 20KB on x86_64 platform.
121 90
122 config SND_HRTIMER 91 config SND_HRTIMER
123 tristate "HR-timer backend support" 92 tristate "HR-timer backend support"
124 depends on HIGH_RES_TIMERS 93 depends on HIGH_RES_TIMERS
125 select SND_TIMER 94 select SND_TIMER
126 help 95 help
127 Say Y here to enable HR-timer backen 96 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
128 the hrtimer as a precise timing sour 97 the hrtimer as a precise timing source. The ALSA sequencer code
129 also can use this timing source. 98 also can use this timing source.
130 99
131 To compile this driver as a module, 100 To compile this driver as a module, choose M here: the module
132 will be called snd-hrtimer. 101 will be called snd-hrtimer.
133 102
134 config SND_DYNAMIC_MINORS 103 config SND_DYNAMIC_MINORS
135 bool "Dynamic device file minor number 104 bool "Dynamic device file minor numbers"
136 help 105 help
137 If you say Y here, the minor numbers 106 If you say Y here, the minor numbers of ALSA device files in
138 /dev/snd/ are allocated dynamically. 107 /dev/snd/ are allocated dynamically. This allows you to have
139 more than 8 sound cards, but require 108 more than 8 sound cards, but requires a dynamic device file
140 system like udev. 109 system like udev.
141 110
142 If you are unsure about this, say N 111 If you are unsure about this, say N here.
143 112
144 config SND_MAX_CARDS 113 config SND_MAX_CARDS
145 int "Max number of sound cards" 114 int "Max number of sound cards"
146 range 4 256 115 range 4 256
147 default 32 116 default 32
148 depends on SND_DYNAMIC_MINORS 117 depends on SND_DYNAMIC_MINORS
149 help 118 help
150 Specify the max number of sound card 119 Specify the max number of sound cards that can be assigned
151 on a single machine. 120 on a single machine.
152 121
153 config SND_SUPPORT_OLD_API 122 config SND_SUPPORT_OLD_API
154 bool "Support old ALSA API" 123 bool "Support old ALSA API"
155 default y 124 default y
156 help 125 help
157 Say Y here to support the obsolete A 126 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
158 or older). 127 or older).
159 128
160 config SND_PROC_FS 129 config SND_PROC_FS
161 bool "Sound Proc FS Support" if EXPERT !! 130 bool "Sound Proc FS Support" if EXPERT
162 depends on PROC_FS !! 131 depends on PROC_FS
163 default y !! 132 default y
164 help !! 133 help
165 Say 'N' to disable Sound proc FS, wh !! 134 Say 'N' to disable Sound proc FS, which may reduce code size about
166 9KB on x86_64 platform. !! 135 9KB on x86_64 platform.
167 If unsure say Y. !! 136 If unsure say Y.
168 137
169 config SND_VERBOSE_PROCFS 138 config SND_VERBOSE_PROCFS
170 bool "Verbose procfs contents" 139 bool "Verbose procfs contents"
171 depends on SND_PROC_FS 140 depends on SND_PROC_FS
172 default y 141 default y
173 help 142 help
174 Say Y here to include code for verbo 143 Say Y here to include code for verbose procfs contents (provides
175 useful information to developers whe !! 144 useful information to developers when a problem occurs). On the
176 other side, it makes the ALSA subsys !! 145 other side, it makes the ALSA subsystem larger.
177 146
178 config SND_CTL_FAST_LOOKUP !! 147 config SND_VERBOSE_PRINTK
179 bool "Fast lookup of control elements" !! 148 bool "Verbose printk"
180 default y <<
181 select XARRAY_MULTI <<
182 help 149 help
183 This option enables the faster looku !! 150 Say Y here to enable verbose log messages. These messages
184 It will consume more memory because !! 151 will help to identify source file and position containing
185 If you want to choose the memory foo !! 152 printed messages.
186 inevitably, turn this off. !! 153
>> 154 You don't need this unless you're debugging ALSA.
187 155
188 config SND_DEBUG 156 config SND_DEBUG
189 bool "Debug" 157 bool "Debug"
190 help 158 help
191 Say Y here to enable ALSA debug code 159 Say Y here to enable ALSA debug code.
192 160
193 config SND_DEBUG_VERBOSE 161 config SND_DEBUG_VERBOSE
194 bool "More verbose debug" 162 bool "More verbose debug"
195 depends on SND_DEBUG 163 depends on SND_DEBUG
196 help 164 help
197 Say Y here to enable extra-verbose d 165 Say Y here to enable extra-verbose debugging messages.
198 !! 166
199 Let me repeat: it enables EXTRA-VERB 167 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
200 So, say Y only if you are ready to b 168 So, say Y only if you are ready to be annoyed.
201 169
202 config SND_PCM_XRUN_DEBUG 170 config SND_PCM_XRUN_DEBUG
203 bool "Enable PCM ring buffer overrun/u 171 bool "Enable PCM ring buffer overrun/underrun debugging"
204 default n 172 default n
205 depends on SND_DEBUG && SND_VERBOSE_PR 173 depends on SND_DEBUG && SND_VERBOSE_PROCFS
206 help 174 help
207 Say Y to enable the PCM ring buffer 175 Say Y to enable the PCM ring buffer overrun/underrun debugging.
208 It is usually not required, but if y 176 It is usually not required, but if you have trouble with
209 sound clicking when system is loaded 177 sound clicking when system is loaded, it may help to determine
210 the process or driver which causes t 178 the process or driver which causes the scheduling gaps.
211 179
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 180 config SND_VMASTER
256 bool 181 bool
257 182
258 config SND_DMA_SGBUF 183 config SND_DMA_SGBUF
259 def_bool y 184 def_bool y
260 depends on X86 185 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 <<
266 186
267 source "sound/core/seq/Kconfig" 187 source "sound/core/seq/Kconfig"
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.