pcm: add support for pcm_ioctl() apicm-11.0-XNPH33R-bacon-3628510d76cm-11.0-XNPH30O-bacon-4f280f505acm-11.0-XNPH25R-bacon-d22b777afacm-11.0-XNPH22R-bacon-03d77315ea

Tinyalsa doesn't expose an api to call ioctls exposed by
the audio drivers. Add pcm_ioctl() api.

Change-Id: Ie519840671f858c23b0acea7155b365c0d9ca59a
(cherry picked from commit bf0ff7a28a8c85508c0bbd1de46e085632fa3579)
(cherry picked from commit 72deed2f35003610748f5d61863348219ddbdd85)
(cherry picked from commit 3a0912fa06d3d1383b9ef84914c8eb864fe11136)

2 files changed, 21 insertions, 0 deletions

diff --git a/include/tinyalsa/asoundlib.h b/include/tinyalsa/asoundlib.h
index ec526e6..c1cef00 100644
--- a/include/tinyalsa/asoundlib.h
+++ b/include/tinyalsa/asoundlib.h
@@ -1,5 +1,8 @@
 /* asoundlib.h
 **
+** Copyright (c) 2013, The Linux Foundation. All rights reserved.
+** Not a contribution.
+**
 ** Copyright 2011, The Android Open Source Project
 **
 ** Redistribution and use in source and binary forms, with or without
@@ -203,6 +206,9 @@ int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames);
 int pcm_start(struct pcm *pcm);
 int pcm_stop(struct pcm *pcm);
 
+/* ioctl function for PCM driver */
+int pcm_ioctl(struct pcm *pcm, int request, ...);
+
 /* Interrupt driven API */
 int pcm_wait(struct pcm *pcm, int timeout);
 
diff --git a/pcm.c b/pcm.c
index 4501777..f0477e6 100644
--- a/pcm.c
+++ b/pcm.c
@@ -1,5 +1,8 @@
 /* pcm.c
 **
+** Copyright (c) 2013, The Linux Foundation. All rights reserved.
+** Not a contribution.
+**
 ** Copyright 2011, The Android Open Source Project
 **
 ** Redistribution and use in source and binary forms, with or without
@@ -1039,3 +1042,15 @@ int pcm_mmap_read(struct pcm *pcm, void *data, unsigned int count)
 
     return pcm_mmap_transfer(pcm, data, count);
 }
+
+int pcm_ioctl(struct pcm *pcm, int request, ...)
+{
+    va_list ap;
+    void * arg;
+
+    va_start(ap, request);
+    arg = va_arg(ap, void *);
+    va_end(ap);
+
+    return ioctl(pcm->fd, request, arg);
+}