Since jack detection requires the input subsystem which may not be desired on small systems it is not built unless required by a driver that is being built. Drivers using jack detection should use a pattern like this:
config SND_FOO tristate "..." ... select SND_JACK if INPUT=y || INPUT=SND
to ensure that the jack detection API is enabled if the input subsystem is. If the input subsystem is not enabled then a stub version of the API is provided.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- sound/core/Kconfig | 6 ++++++ sound/core/Makefile | 1 + 2 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/sound/core/Kconfig b/sound/core/Kconfig index 335d45e..9c4da1c 100644 --- a/sound/core/Kconfig +++ b/sound/core/Kconfig @@ -12,6 +12,12 @@ config SND_HWDEP config SND_RAWMIDI tristate
+# To be effective this also requires INPUT - users should say: +# select SND_JACK if INPUT=y || INPUT=SND +# to avoid having to force INPUT on. +config SND_JACK + bool + config SND_SEQUENCER tristate "Sequencer support" select SND_TIMER diff --git a/sound/core/Makefile b/sound/core/Makefile index da8e685..d57125a 100644 --- a/sound/core/Makefile +++ b/sound/core/Makefile @@ -7,6 +7,7 @@ snd-y := sound.o init.o memory.o info.o control.o misc.o device.o snd-$(CONFIG_ISA_DMA_API) += isadma.o snd-$(CONFIG_SND_OSSEMUL) += sound_oss.o info_oss.o snd-$(CONFIG_SND_VMASTER) += vmaster.o +snd-$(CONFIG_SND_JACK) += jack.o
snd-pcm-objs := pcm.o pcm_native.o pcm_lib.o pcm_timer.o pcm_misc.o \ pcm_memory.o