1 files changed, 132 insertions, 0 deletions
diff --git a/MOST_UNICENS/wrap_volume.c b/MOST_UNICENS/wrap_volume.c
new file mode 100644
index 0000000..5bc1e84
--- /dev/null
+++ b/MOST_UNICENS/wrap_volume.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2017, Microchip Technology Inc. and its subsidiaries.
+ * Author Tobias Jahnke
+ *
+ * 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.
+ *
+ */
+#define _GNU_SOURCE
+#define AFB_BINDING_VERSION 2
+
+#include <string.h>
+#include <time.h>
+#include <assert.h>
+#include <json-c/json.h>
+#include <afb/afb-binding.h>
+
+#include "wrap_volume.h"
+#include "wrap_unicens.h"
+#include "libmostvolume.h"
+
+static int wrap_volume_service_timeout_cb(sd_event_source* source,
+        uint64_t timer __attribute__((__unused__)),
+        void *userdata __attribute__((__unused__))) {
+
+    uint8_t ret;
+
+    sd_event_source_unref(source);
+    ret = lib_most_volume_service();
+
+    if (ret != 0U) {
+        AFB_ERROR("lib_most_volume_service returns %d", ret);
+    }
+
+    return 0;
+}
+
+static void wrap_volume_service_cb(uint16_t timeout) {
+    uint64_t usec;
+    sd_event_now(afb_daemon_get_event_loop(), CLOCK_BOOTTIME, &usec);
+    sd_event_add_time(  afb_daemon_get_event_loop(), NULL, CLOCK_MONOTONIC,
+                        usec + (timeout*1000),
+                        250,
+                        wrap_volume_service_timeout_cb,
+                        NULL);
+}
+
+/* Retrieves a new value adapted to a new maximum value. Minimum value is
+ * always zero. */
+static int wrap_volume_calculate(int value, int max_old, int max_new) {
+
+    if (value > max_old)
+        value = max_old;
+
+    value = (value * max_new) / max_old; /* calculate range: 0..255 */
+    assert(value <= max_new);
+
+    return value;
+}
+
+extern int wrap_volume_init(void) {
+
+    uint8_t ret = 0U;
+    lib_most_volume_init_t mv_init;
+
+    mv_init.writei2c_cb = &wrap_ucs_i2cwrite;
+    mv_init.service_cb = wrap_volume_service_cb;
+
+    ret = lib_most_volume_init(&mv_init);
+
+    return ret * (-1);
+}
+
+extern int wrap_volume_master(int volume) {
+
+    int new_value, ret;
+
+    new_value = wrap_volume_calculate(volume, 100, 255);
+    ret = lib_most_volume_set(LIB_MOST_VOLUME_MASTER, (uint8_t)new_value);
+
+    if (ret != 0) {
+        AFB_ERROR("wrap_volume_master: volume library not ready.");
+        ret = ret * (-1); /* make return value negative */
+    }
+
+    return ret;
+}
+
+extern int wrap_volume_pcm(int *volume_ptr, int volume_sz) {
+
+    const int MAX_PCM_CHANNELS = 6;
+    int cnt, ret;
+    assert(volume_ptr != NULL);
+    assert(volume_sz <= MAX_PCM_CHANNELS);
+
+    for (cnt = 0; cnt < volume_sz; cnt ++) {
+
+        int new_value = wrap_volume_calculate(volume_ptr[cnt], 100, 255);
+        ret = lib_most_volume_set((enum lib_most_volume_channel_t)cnt, (uint8_t)new_value);
+
+        if (ret != 0) {
+            AFB_ERROR("wrap_volume_pcm: volume library not ready.");
+            ret = ret * (-1); /* make return value negative */
+            break;
+        }
+    }
+
+    return ret;
+}
+
+extern int wrap_volume_node_avail(int node, int available) {
+    
+    int ret;
+    ret = lib_most_volume_node_available((uint16_t)node, (uint8_t)available);
+    
+    if (ret != 0) {
+        AFB_ERROR("wrap_volume_node_avail: volume library not ready.");
+        ret = ret * (-1); /* make return value negative */
+    }
+    
+    return ret;
+}
+