ALSA: seq: Reorganize kconfig and build

This is a slightly intensive rewrite of Kconfig and Makefile about
ALSA sequencer stuff.

The first major change is that the kconfig items for the sequencer are
moved to sound/core/seq/Kconfig.  OK, that's easy.

The substantial change is that, instead of hackish top-level module
selection in Makefile, we define a Kconfig item for each sequencer
module.  The driver that requires such sequencer components select
exclusively the kconfig items.  This is more straightforward and
standard way.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/Kconfig

@@ -33,31 +33,6 @@ config SND_JACK_INPUT_DEV
 	depends on SND_JACK
 	default y if INPUT=y || INPUT=SND
 
-config SND_SEQUENCER
-	tristate "Sequencer support"
-	select SND_TIMER
-	help
-	  Say Y or M to enable MIDI sequencer and router support.  This
-	  feature allows routing and enqueueing of MIDI events.  Events
-	  can be processed at a given time.
-
-	  Many programs require this feature, so you should enable it
-	  unless you know what you're doing.
-
-config SND_SEQ_DUMMY
-	tristate "Sequencer dummy client"
-	depends on SND_SEQUENCER
-	help
-	  Say Y here to enable the dummy sequencer client.  This client
-	  is a simple MIDI-through client: all normal input events are
-	  redirected to the output port immediately.
-
-	  You don't need this unless you want to connect many MIDI
-	  devices or applications together.
-
-	  To compile this driver as a module, choose M here: the module
-	  will be called snd-seq-dummy.
-
 config SND_OSSEMUL
 	bool "Enable OSS Emulation"
 	select SOUND_OSS_CORE
@@ -109,20 +84,6 @@ config SND_PCM_TIMER
 	  For some embedded devices, we may disable it to reduce memory
 	  footprint, about 20KB on x86_64 platform.
 
-config SND_SEQUENCER_OSS
-	tristate "OSS Sequencer API"
-	depends on SND_SEQUENCER
-	depends on SND_OSSEMUL
-	help
-	  Say Y here to enable OSS sequencer emulation (both
-	  /dev/sequencer and /dev/music interfaces).
-
-	  Many programs still use the OSS API, so say Y.
-
-	  If you choose M in "Sequencer support" (SND_SEQUENCER),
-	  this will be compiled as a module. The module will be called
-	  snd-seq-oss.
-
 config SND_HRTIMER
 	tristate "HR-timer backend support"
 	depends on HIGH_RES_TIMERS
@@ -135,14 +96,6 @@ config SND_HRTIMER
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-hrtimer.
 
-config SND_SEQ_HRTIMER_DEFAULT
-	bool "Use HR-timer as default sequencer timer"
-	depends on SND_HRTIMER && SND_SEQUENCER
-	default y
-	help
-	  Say Y here to use the HR-timer backend as the default sequencer
-	  timer.
-
 config SND_DYNAMIC_MINORS
 	bool "Dynamic device file minor numbers"
 	help

sound/core/seq/Kconfig

-# define SND_XXX_SEQ to min(SND_SEQUENCER,SND_XXX)
+config SND_SEQUENCER
+	tristate "Sequencer support"
+	select SND_TIMER
+	help
+	  Say Y or M to enable MIDI sequencer and router support.  This
+	  feature allows routing and enqueueing of MIDI events.  Events
+	  can be processed at a given time.
 
-config SND_RAWMIDI_SEQ
-	def_tristate SND_SEQUENCER && SND_RAWMIDI
+	  Many programs require this feature, so you should enable it
+	  unless you know what you're doing.
 
-config SND_OPL3_LIB_SEQ
-	def_tristate SND_SEQUENCER && SND_OPL3_LIB
+if SND_SEQUENCER
 
-config SND_OPL4_LIB_SEQ
-	def_tristate SND_SEQUENCER && SND_OPL4_LIB
+config SND_SEQ_DUMMY
+	tristate "Sequencer dummy client"
+	help
+	  Say Y here to enable the dummy sequencer client.  This client
+	  is a simple MIDI-through client: all normal input events are
+	  redirected to the output port immediately.
 
-config SND_SBAWE_SEQ
-	def_tristate SND_SEQUENCER && SND_SBAWE
+	  You don't need this unless you want to connect many MIDI
+	  devices or applications together.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-seq-dummy.
+
+config SND_SEQUENCER_OSS
+	tristate "OSS Sequencer API"
+	depends on SND_OSSEMUL
+	select SND_SEQ_MIDI_EVENT
+	help
+	  Say Y here to enable OSS sequencer emulation (both
+	  /dev/sequencer and /dev/music interfaces).
+
+	  Many programs still use the OSS API, so say Y.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-seq-oss.
+
+config SND_SEQ_HRTIMER_DEFAULT
+	bool "Use HR-timer as default sequencer timer"
+	depends on SND_HRTIMER
+	default y
+	help
+	  Say Y here to use the HR-timer backend as the default sequencer
+	  timer.
+
+config SND_SEQ_MIDI_EVENT
+	def_tristate SND_RAWMIDI
+
+config SND_SEQ_MIDI
+	tristate
+	select SND_SEQ_MIDI_EVENT
+
+config SND_SEQ_MIDI_EMUL
+	tristate
+
+config SND_SEQ_VIRMIDI
+	tristate
+
+endif # SND_SEQUENCER
 
-config SND_EMU10K1_SEQ
-	def_tristate SND_SEQUENCER && SND_EMU10K1

sound/core/seq/Makefile

@@ -15,15 +15,10 @@ snd-seq-dummy-objs := seq_dummy.o
 snd-seq-virmidi-objs := seq_virmidi.o
 
 obj-$(CONFIG_SND_SEQUENCER) += snd-seq.o snd-seq-device.o
-obj-$(CONFIG_SND_SEQUENCER_OSS) += snd-seq-midi-event.o
 obj-$(CONFIG_SND_SEQUENCER_OSS) += oss/
 
 obj-$(CONFIG_SND_SEQ_DUMMY) += snd-seq-dummy.o
-
-# Toplevel Module Dependency
-obj-$(CONFIG_SND_VIRMIDI) += snd-seq-virmidi.o snd-seq-midi-event.o
-obj-$(CONFIG_SND_RAWMIDI_SEQ) += snd-seq-midi.o snd-seq-midi-event.o
-obj-$(CONFIG_SND_OPL3_LIB_SEQ) += snd-seq-midi-event.o snd-seq-midi-emul.o
-obj-$(CONFIG_SND_OPL4_LIB_SEQ) += snd-seq-midi-event.o snd-seq-midi-emul.o
-obj-$(CONFIG_SND_SBAWE_SEQ) += snd-seq-midi-emul.o snd-seq-virmidi.o
-obj-$(CONFIG_SND_EMU10K1_SEQ) += snd-seq-midi-emul.o snd-seq-virmidi.o
+obj-$(CONFIG_SND_SEQ_MIDI) += snd-seq-midi.o
+obj-$(CONFIG_SND_SEQ_MIDI_EMUL) += snd-seq-midi-emul.o
+obj-$(CONFIG_SND_SEQ_MIDI_EVENT) += snd-seq-midi-event.o
+obj-$(CONFIG_SND_SEQ_VIRMIDI) += snd-seq-virmidi.o

sound/drivers/Kconfig

@@ -12,6 +12,17 @@ config SND_OPL4_LIB
 	select SND_TIMER
 	select SND_HWDEP
 
+# select SEQ stuff to min(SND_SEQUENCER,SND_XXX)
+config SND_OPL3_LIB_SEQ
+	def_tristate SND_SEQUENCER && SND_OPL3_LIB
+	select SND_SEQ_MIDI_EMUL
+	select SND_SEQ_MIDI_EVENT
+
+config SND_OPL4_LIB_SEQ
+	def_tristate SND_SEQUENCER && SND_OPL4_LIB
+	select SND_SEQ_MIDI_EMUL
+	select SND_SEQ_MIDI_EVENT
+
 config SND_VX_LIB
 	tristate
 	select FW_LOADER
@@ -99,6 +110,8 @@ config SND_VIRMIDI
 	depends on SND_SEQUENCER
 	select SND_TIMER
 	select SND_RAWMIDI
+	select SND_SEQ_VIRMIDI
+	select SND_SEQ_MIDI_EVENT
 	help
 	  Say Y here to include the virtual MIDI driver.  This driver
 	  allows to connect applications using raw MIDI devices to

sound/isa/Kconfig

@@ -384,6 +384,12 @@ config SND_SBAWE
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-sbawe.
 
+# select SEQ stuff to min(SND_SEQUENCER,SND_XXX)
+config SND_SBAWE_SEQ
+	def_tristate SND_SEQUENCER && SND_SBAWE
+	select SND_SEQ_MIDI_EMUL
+	select SND_SEQ_VIRMIDI
+
 config SND_SB16_CSP
 	bool "Sound Blaster 16/AWE CSP support"
 	depends on (SND_SB16 || SND_SBAWE) && (BROKEN || !PPC)

sound/pci/Kconfig

@@ -477,6 +477,12 @@ config SND_EMU10K1
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-emu10k1.
 
+# select SEQ stuff to min(SND_SEQUENCER,SND_XXX)
+config SND_EMU10K1_SEQ
+	def_tristate SND_SEQUENCER && SND_EMU10K1
+	select SND_SEQ_MIDI_EMUL
+	select SND_SEQ_VIRMIDI
+
 config SND_EMU10K1X
 	tristate "Emu10k1X (Dell OEM Version)"
 	select SND_AC97_CODEC