1 files changed, 74 insertions, 0 deletions
diff --git a/HAL-afb/Scarlett-Focusrite/ScarlettUsbHAL.c b/HAL-afb/Scarlett-Focusrite/ScarlettUsbHAL.c
new file mode 100644
index 0000000..1ff5320
--- /dev/null
+++ b/HAL-afb/Scarlett-Focusrite/ScarlettUsbHAL.c
@@ -0,0 +1,74 @@
+/*
+ * 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.
+ * 
+ * 
+ * To find out which control your sound card uses
+ *  aplay -l  # Check sndcard name name in between []
+ *  amixer -D hw:xx controls # get supported controls
+ *  amixer -D "hw:3" cget numid=xx  # get control settings
+ * 
+ */
+#define _GNU_SOURCE 
+#include "hal-interface.h"
+#include "audio-interface.h" 
+
+STATIC struct json_object* MasterOnOff (alsaHalCtlMapT *control, void* handle) {
+    static int powerStatus=0;
+    
+    if (! powerStatus) {
+        powerStatus = 1;
+        AFB_DEBUG ("Power Set to On");
+    } else {
+        powerStatus  = 0;
+        AFB_DEBUG ("Power Set to Off");        
+    }
+    
+    return NULL;
+}
+
+// Map HAL hight sndctl with Alsa numid and optionally with a custom callback for non Alsa supported functionalities. 
+STATIC alsaHalMapT  alsaHalMap[]= { 
+  { .alsa={.control=Master_Playback_Volume,.numid=16, .name="Master-Vol"   , .values=1,.minval=0,.maxval= 87 ,.step=0}, .info= "Master Playback Volume" },
+  { .alsa={.control=PCM_Playback_Volume   ,.numid=27, .name="Play-Vol"     , .values=2,.minval=0,.maxval= 255,.step=0}, .info= "PCM Playback Volume" },
+  { .alsa={.control=PCM_Playback_Switch   ,.numid=17, .name="Play-Switch"  , .values=1,.minval=0,.maxval= 1  ,.step=0}, .info= "Master Playback Switch" },
+  { .alsa={.control=Capture_Volume        ,.numid=12, .name="Capt-vol"     , .values=2,.minval=0,.maxval= 31 ,.step=0}, .info= "Capture Volume" },
+  { .alsa={.control=Master_OnOff_Switch   ,.numid=99, .name="Power-Switch"}, .cb={.callback=MasterOnOff, .handle=NULL}, .info= "OnOff Global Switch"},
+  { .alsa={.numid=0}, .cb={.callback=NULL, .handle=NULL}} /* marker for end of the array */
+} ;
+
+// HAL sound card mapping info
+STATIC alsaHalSndCardT alsaHalSndCard  = {
+    .name  = "Scarlett 18i8 USB", //  WARNING: name MUST match with 'aplay -l'
+    .info  = "Hardware Abstraction Layer for Scarlett Focusrite USB professional music sound card",
+    .ctls  = alsaHalMap,
+};
+
+
+STATIC int sndServiceInit () {
+    int err;
+    AFB_DEBUG ("IntelHalBinding Init");
+
+    err = halServiceInit (afbBindingV2.api, &alsaHalSndCard);
+    return err;
+}
+
+// API prefix should be unique for each snd card
+PUBLIC const struct afb_binding_v2 afbBindingV2 = {
+    .api     = "scarlett-usb",
+    .init    = sndServiceInit,
+    .verbs   = halServiceApi,
+    .onevent = halServiceEvent,
+};