From 48d882978eb0a15547093b4542a82b5c22548041 Mon Sep 17 00:00:00 2001
From: Libin Yang <libin.yang@intel.com>
Date: Wed, 31 Dec 2014 22:09:54 +0800
Subject: [PATCH] ALSA: pcm: add SNDRV_PCM_TRIGGER_DRAIN trigger

Add SNDRV_PCM_TRIGGER_DRAIN trigger for pcm drain.

Some audio devices require notification of drain events
in order to properly drain and shutdown an audio stream.

Signed-off-by: Libin Yang <libin.yang@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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