[alsa-devel] [PATCH] ASoC: Amstrad Delta: add info about the line discipline requirement to Kconfig help text

Janusz Krzysztofik jkrzyszt at tis.icnet.pl
Sat Oct 24 00:06:48 CEST 2009

I thought it could be usefull to add some information on how to get the device
fully supported by loading a line discipline on the modem line.

Signed-off-by: Janusz Krzysztofik <jkrzyszt at tis.icnet.pl>

As you could probably notice, I am not a native English, so please feel free
to correct my poor language if desired.

--- linux-2.6.32-rc5/sound/soc/omap/Kconfig.orig	2009-10-16 02:41:50.000000000 +0200
+++ linux-2.6.32-rc5/sound/soc/omap/Kconfig	2009-10-24 00:01:26.000000000 +0200
@@ -21,7 +21,18 @@ config SND_OMAP_SOC_AMS_DELTA
 	select SND_SOC_CX20442
-	  Say Y if you want to add support for SoC audio on Amstrad Delta.
+	  Say Y  if you want to add support  for SoC audio device  connected to
+	  a handset and a speakerphone found on Amstrad E3 (Delta) videophone.
+	  Note that in order to get those devices fully supported,  you have to
+	  build  the kernel  with  standard  serial port  driver  included  and
+	  configured for at least 4 ports.  Then, from userspace, you must load
+	  a line discipline #19 on the modem (ttyS3) serial line.  The simplest
+	  way to achieve this is to install util-linux-ng  and use the included
+	  ldattach  utility.  This  can be  started  automatically  from  udev,
+	  a simple rule like this one should do the trick (it does for me):
+	  	ACTION=="add", KERNEL=="controlC0", \
+				RUN+="/usr/sbin/ldattach 19 /dev/ttyS3"
 config SND_OMAP_SOC_OSK5912
 	tristate "SoC Audio support for omap osk5912"

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