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