xref: /openbmc/linux/sound/core/Kconfig (revision 5bd8e16d) 
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"
232