tinyalsa: add support for Mixer plugins
Update the mixer framework to support plugins. Add ability for physical
card to have mixer controls registered by either kernel or plugins.
Split mixer controls into two groups, one for kernel registered (hw group)
and other for plugin registered (virtual group).
Bug: 166482201
Test: audio smoke tests
CRs-Fixed: 2563258
Change-Id: I5a29eb8d7675f804c5d2f10da978f28f8c2cf134
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>
(cherry picked from commit 4268f1b58f5bf534749a0721f6c22b4c5b330d7a)
diff --git a/mixer_io.h b/mixer_io.h
new file mode 100644
index 0000000..77daae0
--- /dev/null
+++ b/mixer_io.h
@@ -0,0 +1,52 @@
+/* mixer_io.h
+**
+** Copyright (c) 2019, The Linux Foundation. All rights reserved.
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above
+** copyright notice, this list of conditions and the following
+** disclaimer in the documentation and/or other materials provided
+** with the distribution.
+** * Neither the name of The Linux Foundation nor the names of its
+** contributors may be used to endorse or promote products derived
+** from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**/
+
+#ifndef __MIXER_H__
+#define __MIXER_H__
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sound/asound.h>
+
+struct mixer_ops;
+
+int mixer_hw_open(unsigned int card, void **data,
+ struct mixer_ops **ops);
+int mixer_plugin_open(unsigned int card, void **data,
+ struct mixer_ops **ops);
+
+struct mixer_ops {
+ void (*close) (void *data);
+ int (*get_poll_fd) (void *data, struct pollfd *pfd, int count);
+ ssize_t (*read_event) (void *data, struct snd_ctl_event *ev, size_t size);
+ int (*ioctl) (void *data, unsigned int cmd, ...);
+};
+
+#endif /* end of __MIXER_H__ */