commit 0d94e41abe271c86df06bcf72d24f9ca7ce771f0
author Mark Brown <broonie@opensource.wolfsonmicro.com> Mon Jul 28 19:05:36 2008 +0100
committer Jaroslav Kysela <perex@perex.cz> Tue Jul 29 21:32:06 2008 +0200
tree 6810d9b350d2fc8b0579d082206587f07bea5d96
parent e76d8ceaaff9d7fc1ba2b1963a9f34151832223b

ALSA: Build jack detection

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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/core/Kconfig

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_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