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ALSA: seq: Allow the tristate build of OSS emulation

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Currently OSS sequencer emulation is tied with ALSA sequencer core,
both are built in the same level; i.e. when CONFIG_SND_SEQUENCER=y,
the OSS sequencer emulation is also always built-in, even though the
functionality can be built as an individual module.

This patch changes the rule and allows users to build snd-seq-oss
module while others are built-in.  Essentially, it's just a few simple
changes in Kconfig and Makefile.  Some driver codes like opl3 need to
convert from the simple ifdef to IS_ENABLED().  But that's all.

You might wonder how about the dependency: right, it can be messy, but
it still works.  Since we rewrote the sequencer binding with the
standard bus, the driver can be bound at any time on demand.  So, the
synthesizer driver module can be loaded individually from the OSS
emulation core before/after it.

Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Takashi Iwai 2017-06-09 14:06:46 +02:00
commit 3d774d5ef0
11 changed files with 22 additions and 28 deletions
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6
sound/synth/emux/emux.c
View file

@ -47,7 +47,7 @@ int snd_emux_new(struct snd_emux **remu)
mutex_init(&emu->register_mutex);
emu->client = -1;
#ifdef CONFIG_SND_SEQUENCER_OSS
#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
emu->oss_synth = NULL;
#endif
emu->max_voices = 0;
@ -123,7 +123,7 @@ int snd_emux_register(struct snd_emux *emu, struct snd_card *card, int index, ch
snd_emux_init_voices(emu);
snd_emux_init_seq(emu, card, index);
#ifdef CONFIG_SND_SEQUENCER_OSS
#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
snd_emux_init_seq_oss(emu);
#endif
snd_emux_init_virmidi(emu, card);
@ -150,7 +150,7 @@ int snd_emux_free(struct snd_emux *emu)
snd_emux_proc_free(emu);
snd_emux_delete_virmidi(emu);
#ifdef CONFIG_SND_SEQUENCER_OSS
#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
snd_emux_detach_seq_oss(emu);
#endif
snd_emux_detach_seq(emu);

2
sound/synth/emux/emux_effect.c
View file

@ -150,7 +150,7 @@ effect_get_offset(struct snd_midi_channel *chan, int lo, int hi, int mode)
return addr;
}
#ifdef CONFIG_SND_SEQUENCER_OSS
#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
/* change effects - for OSS sequencer compatibility */
void
snd_emux_send_effect_oss(struct snd_emux_port *port,

4
sound/synth/emux/emux_oss.c
View file

@ -23,8 +23,6 @@
*/
#ifdef CONFIG_SND_SEQUENCER_OSS
#include <linux/export.h>
#include <linux/uaccess.h>
#include <sound/core.h>
@ -505,5 +503,3 @@ fake_event(struct snd_emux *emu, struct snd_emux_port *port, int ch, int param,
ev.data.control.value = val;
snd_emux_event_input(&ev, 0, port, atomic, hop);
}
#endif /* CONFIG_SND_SEQUENCER_OSS */