xref: /openbmc/linux/sound/core/Kconfig (revision 4dc7ccf7) 
1# ALSA soundcard-configuration
2config SND_TIMER
3	tristate
4
5config SND_PCM
6	tristate
7	select SND_TIMER
8	select GCD
9
10config SND_HWDEP
11	tristate
12
13config SND_RAWMIDI
14	tristate
15
16# To be effective this also requires INPUT - users should say:
17#    select SND_JACK if INPUT=y || INPUT=SND
18# to avoid having to force INPUT on.
19config SND_JACK
20	bool
21
22config SND_SEQUENCER
23	tristate "Sequencer support"
24	select SND_TIMER
25	help
26	  Say Y or M to enable MIDI sequencer and router support.  This
27	  feature allows routing and enqueueing of MIDI events.  Events
28	  can be processed at a given time.
29
30	  Many programs require this feature, so you should enable it
31	  unless you know what you're doing.
32
33config SND_SEQ_DUMMY
34	tristate "Sequencer dummy client"
35	depends on SND_SEQUENCER
36	help
37	  Say Y here to enable the dummy sequencer client.  This client
38	  is a simple MIDI-through client: all normal input events are
39	  redirected to the output port immediately.
40
41	  You don't need this unless you want to connect many MIDI
42	  devices or applications together.
43
44	  To compile this driver as a module, choose M here: the module
45	  will be called snd-seq-dummy.
46
47config SND_OSSEMUL
48	select SOUND_OSS_CORE
49	bool
50
51config SND_MIXER_OSS
52	tristate "OSS Mixer API"
53	select SND_OSSEMUL
54	help
55	  To enable OSS mixer API emulation (/dev/mixer*), say Y here
56	  and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
57
58	  Many programs still use the OSS API, so say Y.
59
60	  To compile this driver as a module, choose M here: the module
61	  will be called snd-mixer-oss.
62
63config SND_PCM_OSS
64	tristate "OSS PCM (digital audio) API"
65	select SND_OSSEMUL
66	select SND_PCM
67	help
68	  To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
69	  here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
70
71	  Many programs still use the OSS API, so say Y.
72
73	  To compile this driver as a module, choose M here: the module
74	  will be called snd-pcm-oss.
75
76config SND_PCM_OSS_PLUGINS
77	bool "OSS PCM (digital audio) API - Include plugin system"
78	depends on SND_PCM_OSS
79        default y
80	help
81          If you disable this option, the ALSA's OSS PCM API will not
82          support conversion of channels, formats and rates. It will
83          behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
84
85config SND_SEQUENCER_OSS
86	bool "OSS Sequencer API"
87	depends on SND_SEQUENCER
88	select SND_OSSEMUL
89	help
90	  Say Y here to enable OSS sequencer emulation (both
91	  /dev/sequencer and /dev/music interfaces).
92
93	  Many programs still use the OSS API, so say Y.
94
95	  If you choose M in "Sequencer support" (SND_SEQUENCER),
96	  this will be compiled as a module. The module will be called
97	  snd-seq-oss.
98
99config SND_HRTIMER
100	tristate "HR-timer backend support"
101	depends on HIGH_RES_TIMERS
102	select SND_TIMER
103	help
104	  Say Y here to enable HR-timer backend for ALSA timer.  ALSA uses
105	  the hrtimer as a precise timing source. The ALSA sequencer code
106	  also can use this timing source.
107
108	  To compile this driver as a module, choose M here: the module
109	  will be called snd-hrtimer.
110
111config SND_SEQ_HRTIMER_DEFAULT
112	bool "Use HR-timer as default sequencer timer"
113	depends on SND_HRTIMER && SND_SEQUENCER
114	default y
115	help
116	  Say Y here to use the HR-timer backend as the default sequencer
117	  timer.
118
119config SND_RTCTIMER
120	tristate "RTC Timer support"
121	depends on RTC
122	select SND_TIMER
123	help
124	  Say Y here to enable RTC timer support for ALSA.  ALSA uses
125	  the RTC timer as a precise timing source and maps the RTC
126	  timer to ALSA's timer interface.  The ALSA sequencer code also
127	  can use this timing source.
128
129	  To compile this driver as a module, choose M here: the module
130	  will be called snd-rtctimer.
131
132	  Note that this option is exclusive with the new RTC drivers
133	  (CONFIG_RTC_CLASS) since this requires the old API.
134
135config SND_SEQ_RTCTIMER_DEFAULT
136	bool "Use RTC as default sequencer timer"
137	depends on SND_RTCTIMER && SND_SEQUENCER
138	depends on !SND_SEQ_HRTIMER_DEFAULT
139	default y
140	help
141	  Say Y here to use the RTC timer as the default sequencer
142	  timer.  This is strongly recommended because it ensures
143	  precise MIDI timing even when the system timer runs at less
144	  than 1000 Hz.
145
146	  If in doubt, say Y.
147
148config SND_DYNAMIC_MINORS
149	bool "Dynamic device file minor numbers"
150	help
151	  If you say Y here, the minor numbers of ALSA device files in
152	  /dev/snd/ are allocated dynamically.  This allows you to have
153	  more than 8 sound cards, but requires a dynamic device file
154	  system like udev.
155
156	  If you are unsure about this, say N here.
157
158config SND_SUPPORT_OLD_API
159	bool "Support old ALSA API"
160	default y
161	help
162	  Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
163	  or older).
164
165config SND_VERBOSE_PROCFS
166	bool "Verbose procfs contents"
167	depends on PROC_FS
168	default y
169	help
170	  Say Y here to include code for verbose procfs contents (provides
171          useful information to developers when a problem occurs).  On the
172          other side, it makes the ALSA subsystem larger.
173
174config SND_VERBOSE_PRINTK
175	bool "Verbose printk"
176	help
177	  Say Y here to enable verbose log messages.  These messages
178	  will help to identify source file and position containing
179	  printed messages.
180
181	  You don't need this unless you're debugging ALSA.
182
183config SND_DEBUG
184	bool "Debug"
185	help
186	  Say Y here to enable ALSA debug code.
187
188config SND_DEBUG_VERBOSE
189	bool "More verbose debug"
190	depends on SND_DEBUG
191	help
192	  Say Y here to enable extra-verbose debugging messages.
193
194	  Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
195	  So, say Y only if you are ready to be annoyed.
196
197config SND_PCM_XRUN_DEBUG
198	bool "Enable PCM ring buffer overrun/underrun debugging"
199	default n
200	depends on SND_DEBUG && SND_VERBOSE_PROCFS
201	help
202	  Say Y to enable the PCM ring buffer overrun/underrun debugging.
203	  It is usually not required, but if you have trouble with
204	  sound clicking when system is loaded, it may help to determine
205	  the process or driver which causes the scheduling gaps.
206
207config SND_VMASTER
208	bool
209
210config SND_DMA_SGBUF
211	def_bool y
212	depends on X86
213
214source "sound/core/seq/Kconfig"
215