Added a POC for ALSA/HAL plugin

1 files changed, 92 insertions, 0 deletions

diff --git a/HAL-afb/HAL-plugin/HalPlug.h b/HAL-afb/HAL-plugin/HalPlug.h
new file mode 100644
index 0000000..5e3da6f
--- /dev/null
+++ b/HAL-afb/HAL-plugin/HalPlug.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2016 "IoT.bzh"
+ * Author Fulup Ar Foll <fulup@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * AfbCallBack (snd_ctl_hal_t *handle, int numid, void **response);
+ *  AfbHalInit is mandatory and called with numid=0
+ * 
+ * Syntaxe in .asoundrc file
+ *   CrlLabel    { cb MyFunctionName name "My_Second_Control" }
+ */
+
+
+#include <alsa/asoundlib.h>
+#include <alsa/control_external.h>
+#include <linux/soundcard.h>
+
+#ifndef SOUND_HAL_MAX_CTLS
+#define SOUND_HAL_MAX_CTLS 255
+#endif
+
+
+typedef enum {
+    CTLCB_INIT ,
+    CTLCB_CLOSE ,
+    CTLCB_ELEM_COUNT ,
+    CTLCB_ELEM_LIST ,
+    CTLCB_FIND_ELEM ,
+    CTLCB_FREE_KEY ,
+    CTLCB_GET_ATTRIBUTE ,
+    CTLCB_GET_INTEGER_INFO ,
+    CTLCB_GET_INTEGER64_INFO ,
+    CTLCB_GET_ENUMERATED_INFO ,
+    CTLCB_GET_ENUMERATED_NAME ,
+    CTLCB_READ_INTEGER ,
+    CTLCB_READ_INTEGER64 ,
+    CTLCB_READ_ENUMERATED ,
+    CTLCB_READ_BYTES ,
+    CTLCB_READ_IEC958 ,
+    CTLCB_WRITE_INTEGER ,
+    CTLCB_WRITE_INTEGER64 ,
+    CTLCB_WRITE_ENUMERATED ,
+    CTLCB_WRITE_BYTES ,
+    CTLCB_WRITE_IEC958 ,
+    CTLCB_SUBSCRIBE_EVENTS ,
+    CTLCB_READ_EVENT ,
+    CTLCB_POLL_DESCRIPTORS_COUNT ,
+    CTLCB_POLL_DESCRIPTORS
+} snd_ctl_action_t;
+
+typedef struct {
+  int ctlNumid;
+  const char *ctlName;  
+} snd_ctl_conf_t;
+
+typedef struct {
+    int type;
+    int acc;
+    unsigned count;  
+} snd_ctl_get_attrib_t;
+
+typedef struct {
+    int imin;
+    int imax;
+    int istep;  
+} snd_ctl_get_int_info_t;
+
+typedef int(*snd_ctl_cb_t)(void *handle, snd_ctl_action_t action, snd_ctl_ext_key_t key, void *response);
+
+typedef struct snd_ctl_hal {
+	snd_ctl_ext_t ext;
+	char *devid;
+        snd_ctl_t  *ctlDev;
+	unsigned int ctlsCount;
+        void *dlHandle;
+        snd_ctl_conf_t ctls[SOUND_HAL_MAX_CTLS];
+        snd_ctl_elem_info_t *infos[SOUND_HAL_MAX_CTLS];
+        snd_ctl_cb_t cbs[SOUND_HAL_MAX_CTLS];
+} snd_ctl_hal_t;
+
+