xref: /linux/sound/core/Kconfig (revision 9a6b55ac) 
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_COMPRESS_OFFLOAD
30	tristate
31
32config SND_JACK
33	bool
34
35# enable input device support in jack layer
36config SND_JACK_INPUT_DEV
37	bool
38	depends on SND_JACK
39	default y if INPUT=y || INPUT=SND
40
41config SND_OSSEMUL
42	bool "Enable OSS Emulation"
43	select SOUND_OSS_CORE
44	help
45	  This option enables the build of OSS emulation layer.
46
47config SND_MIXER_OSS
48	tristate "OSS Mixer API"
49	depends on SND_OSSEMUL
50	help
51	  To enable OSS mixer API emulation (/dev/mixer*), say Y here
52	  and read <file:Documentation/sound/designs/oss-emulation.rst>.
53
54	  Many programs still use the OSS API, so say Y.
55
56	  To compile this driver as a module, choose M here: the module
57	  will be called snd-mixer-oss.
58
59config SND_PCM_OSS
60	tristate "OSS PCM (digital audio) API"
61	depends on SND_OSSEMUL
62	select SND_PCM
63	help
64	  To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
65	  here 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-pcm-oss.
71
72config SND_PCM_OSS_PLUGINS
73	bool "OSS PCM (digital audio) API - Include plugin system"
74	depends on SND_PCM_OSS
75	default y
76	help
77	  If you disable this option, the ALSA's OSS PCM API will not
78	  support conversion of channels, formats and rates. It will
79	  behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
80
81config SND_PCM_TIMER
82	bool "PCM timer interface" if EXPERT
83	default y
84	help
85	  If you disable this option, pcm timer will be unavailable, so
86	  those stubs that use pcm timer (e.g. dmix, dsnoop & co) may work
87	  incorrectlly.
88
89	  For some embedded devices, we may disable it to reduce memory
90	  footprint, about 20KB on x86_64 platform.
91
92config SND_HRTIMER
93	tristate "HR-timer backend support"
94	depends on HIGH_RES_TIMERS
95	select SND_TIMER
96	help
97	  Say Y here to enable HR-timer backend for ALSA timer.  ALSA uses
98	  the hrtimer as a precise timing source. The ALSA sequencer code
99	  also can use this timing source.
100
101	  To compile this driver as a module, choose M here: the module
102	  will be called snd-hrtimer.
103
104config SND_DYNAMIC_MINORS
105	bool "Dynamic device file minor numbers"
106	help
107	  If you say Y here, the minor numbers of ALSA device files in
108	  /dev/snd/ are allocated dynamically.  This allows you to have
109	  more than 8 sound cards, but requires a dynamic device file
110	  system like udev.
111
112	  If you are unsure about this, say N here.
113
114config SND_MAX_CARDS
115	int "Max number of sound cards"
116	range 4 256
117	default 32
118	depends on SND_DYNAMIC_MINORS
119	help
120	  Specify the max number of sound cards that can be assigned
121	  on a single machine.
122
123config SND_SUPPORT_OLD_API
124	bool "Support old ALSA API"
125	default y
126	help
127	  Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
128	  or older).
129
130config SND_PROC_FS
131	bool "Sound Proc FS Support" if EXPERT
132	depends on PROC_FS
133	default y
134	help
135	  Say 'N' to disable Sound proc FS, which may reduce code size about
136	  9KB on x86_64 platform.
137	  If unsure say Y.
138
139config SND_VERBOSE_PROCFS
140	bool "Verbose procfs contents"
141	depends on SND_PROC_FS
142	default y
143	help
144	  Say Y here to include code for verbose procfs contents (provides
145	  useful information to developers when a problem occurs).  On the
146	  other side, it makes the ALSA subsystem larger.
147
148config 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
157config SND_DEBUG
158	bool "Debug"
159	help
160	  Say Y here to enable ALSA debug code.
161
162config SND_DEBUG_VERBOSE
163	bool "More verbose debug"
164	depends on SND_DEBUG
165	help
166	  Say Y here to enable extra-verbose debugging messages.
167
168	  Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
169	  So, say Y only if you are ready to be annoyed.
170
171config SND_PCM_XRUN_DEBUG
172	bool "Enable PCM ring buffer overrun/underrun debugging"
173	default n
174	depends on SND_DEBUG && SND_VERBOSE_PROCFS
175	help
176	  Say Y to enable the PCM ring buffer overrun/underrun debugging.
177	  It is usually not required, but if you have trouble with
178	  sound clicking when system is loaded, it may help to determine
179	  the process or driver which causes the scheduling gaps.
180
181config SND_VMASTER
182	bool
183
184config SND_DMA_SGBUF
185	def_bool y
186	depends on X86
187
188source "sound/core/seq/Kconfig"
189