2017-06-09 20:40:18 +08:00
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config SND_SEQUENCER
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tristate "Sequencer support"
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select SND_TIMER
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ALSA: seq: Allow the modular sequencer registration
Many drivers bind the sequencer stuff in off-load by another driver
module, so that it's loaded only on demand. In the current code, this
mechanism doesn't work when the driver is built-in while the sequencer
is module. We check with IS_REACHABLE() and enable only when the
sequencer is in the same level of build.
However, this is basically a overshoot. The binder code
(snd-seq-device) is an individual module from the sequencer core
(snd-seq), and we just have to make the former a built-in while
keeping the latter a module for allowing the scenario like the above.
This patch achieves that by rewriting Kconfig slightly. Now, a driver
that provides the manual sequencer device binding should select
CONFIG_SND_SEQ_DEVICE in a way as
select SND_SEQ_DEVICE if SND_SEQUENCER != n
Note that the "!=n" is needed here to avoid the influence of the
sequencer core is module while the driver is built-in.
Also, since rawmidi.o may be linked with snd_seq_device.o when
built-in, we have to shuffle the code to make the linker happy.
(the kernel linker isn't smart enough yet to handle such a case.)
That is, snd_seq_device.c is moved to sound/core from sound/core/seq,
as well as Makefile.
Last but not least, the patch replaces the code using IS_REACHABLE()
with IS_ENABLED(), since now the condition meets always when enabled.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-06-09 21:11:58 +08:00
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select SND_SEQ_DEVICE
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2017-06-09 20:40:18 +08:00
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help
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Say Y or M to enable MIDI sequencer and router support. This
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feature allows routing and enqueueing of MIDI events. Events
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can be processed at a given time.
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2009-05-26 23:07:52 +08:00
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2017-06-09 20:40:18 +08:00
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Many programs require this feature, so you should enable it
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unless you know what you're doing.
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2009-05-26 23:07:52 +08:00
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2017-06-09 20:40:18 +08:00
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if SND_SEQUENCER
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2009-05-26 23:07:52 +08:00
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2017-06-09 20:40:18 +08:00
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config SND_SEQ_DUMMY
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tristate "Sequencer dummy client"
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help
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Say Y here to enable the dummy sequencer client. This client
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is a simple MIDI-through client: all normal input events are
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redirected to the output port immediately.
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2009-05-26 23:07:52 +08:00
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2017-06-09 20:40:18 +08:00
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You don't need this unless you want to connect many MIDI
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devices or applications together.
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To compile this driver as a module, choose M here: the module
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will be called snd-seq-dummy.
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config SND_SEQUENCER_OSS
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tristate "OSS Sequencer API"
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depends on SND_OSSEMUL
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select SND_SEQ_MIDI_EVENT
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help
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Say Y here to enable OSS sequencer emulation (both
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/dev/sequencer and /dev/music interfaces).
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Many programs still use the OSS API, so say Y.
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To compile this driver as a module, choose M here: the module
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will be called snd-seq-oss.
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config SND_SEQ_HRTIMER_DEFAULT
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bool "Use HR-timer as default sequencer timer"
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depends on SND_HRTIMER
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default y
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help
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Say Y here to use the HR-timer backend as the default sequencer
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timer.
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config SND_SEQ_MIDI_EVENT
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def_tristate SND_RAWMIDI
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config SND_SEQ_MIDI
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tristate
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select SND_SEQ_MIDI_EVENT
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config SND_SEQ_MIDI_EMUL
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tristate
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config SND_SEQ_VIRMIDI
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tristate
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endif # SND_SEQUENCER
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