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