File 0001-ucm-Document-PlaybackPCMIsDummy-and-CapturePCMIsDumm.patch of Package alsa

From 7a748af4db17cb0b26d19e5f9939d277128ec94b Mon Sep 17 00:00:00 2001
From: Tanu Kaskinen <tanu.kaskinen@linux.intel.com>
Date: Thu, 26 Jun 2014 13:30:25 +0300
Subject: [PATCH 01/14] ucm: Document PlaybackPCMIsDummy and CapturePCMIsDummy
 values

At least PulseAudio needs special handling for dummy devices. To allow
that to happen automatically, the UCM configuration should contain the
information about which PCMs are dummy.

Signed-off-by: Tanu Kaskinen <tanu.kaskinen@linux.intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 include/use-case.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/use-case.h b/include/use-case.h
index 4e13249133e6..f30168f86471 100644
--- a/include/use-case.h
+++ b/include/use-case.h
@@ -258,7 +258,17 @@ int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
  * Recommended names for values:
  *   TQ			- Tone Quality
  *   PlaybackPCM	- full PCM playback device name
+ *   PlaybackPCMIsDummy	- Valid values: "yes" and "no". If set to "yes", the
+ *			  PCM named by the PlaybackPCM value is a dummy device,
+ *			  meaning that opening it enables an audio path in the
+ *			  hardware, but writing to the PCM device has no
+ *			  effect.
  *   CapturePCM		- full PCM capture device name
+ *   CapturePCMIsDummy	- Valid values: "yes" and "no". If set to "yes", the
+ *			  PCM named by the CapturePCM value is a dummy device,
+ *			  meaning that opening it enables an audio path in the
+ *			  hardware, but reading from the PCM device has no
+ *			  effect.
  *   PlaybackRate	- playback device sample rate
  *   PlaybackChannels	- playback device channel count
  *   PlaybackCTL	- playback control device name
-- 
2.0.1