Add Hal (audio json configration files)

Add some audio json configration files inspired from hal available in
'4a-hal-reference' and '4a-hal-community'.
Each one of these files are meant to be be a reproduction of old hal
using the new 4a-hal implementation.
List of hal added :
- Rcar M3
- Intel Minnowboard
- 2ch generic usb
- Intel
- Jabra solemate
- Ensoniq

Change-Id: I6bac5ed1e6d4ab72975427a9a2343851f874df79
Signed-off-by: Jonathan Aillet <jonathan.aillet@iot.bzh>

7 files changed, 986 insertions, 2 deletions

diff --git a/4a-hal-cfg-community/hal-4a-ensoniq.json b/4a-hal-cfg-community/hal-4a-ensoniq.json
new file mode 100644
index 0000000..809acf8
--- /dev/null
+++ b/4a-hal-cfg-community/hal-4a-ensoniq.json
@@ -0,0 +1,199 @@
+{
+    "$schema": "http://iot.bzh/download/public/schema/json/ctl-schema.json",
+    "metadata": {
+        "uid": "/dev/snd/by-id/usb-0d8c_USB_Sound_Device-03",
+        "version": "0.9",
+        "api": "4a-hal-ensoniq",
+        "require": [ "alsacore", "smixer" ],
+        "info": "4a hal for Ensoniq",
+        "author": "Jonathan Aillet",
+        "date": "2018-06-13"
+    },
+    "controls": [
+        {
+            "uid": "ping",
+            "info": "Ping hal",
+            "action": "api://4a-hal-manager#ping"
+        }
+    ],
+    "halmap": [
+        {
+            "uid": "agl-master-playback-volume",
+            "alsa": {
+                "name": "Master Playback Volume",
+                "value": 100
+            }
+        },
+        {
+            "uid": "agl-pcm-playback-volume",
+            "alsa": {
+                "name": "PCM Playback Volume",
+                "value": 100
+            }
+        },
+        {
+            "uid": "agl-master-playback-switch",
+            "alsa": {
+                "name": "Master Playback Switch",
+                "value": 1
+            }
+        },
+        {
+            "uid": "agl-mic-capture-volume",
+            "alsa": {
+                "name": "Capture Volume"
+            }
+        }
+    ],
+    "halmixer": {
+        "uid": "jabra-solemate",
+        "mixerapi": "smixer",
+        "ramps": [
+            {
+                "uid": "ramp-very-fast",
+                "delay": 50,
+                "up": 6,
+                "down": 4
+            },
+            {
+                "uid": "ramp-fast",
+                "delay": 50,
+                "up": 2,
+                "down": 4
+            },
+            {
+                "uid": "ramp-normal",
+                "delay": 100,
+                "up": 6,
+                "down": 10
+            },
+            {
+                "uid": "ramp-slow",
+                "delay": 100,
+                "up": 4,
+                "down": 2
+            },
+            {
+                "uid": "ramp-very-slow",
+                "delay": 100,
+                "up": 1,
+                "down": 1
+            }
+        ],
+        "playbacks" : {
+            "uid": "JABRA-SOLEMATE",
+            "path": "/dev/snd/by-id/usb-0d8c_USB_Sound_Device-03",
+            "params": {
+                "rate": 48000
+            },
+            "sink": {
+                "controls": {
+                    "volume": {
+                        "name": "Speaker Playback Volume",
+                        "value": 80
+                    },
+                    "mute": {
+                        "name": "Speaker Playback Switch"
+                    }
+                },
+                "channels": [
+                    {
+                        "uid": "front-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "front-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "captures": {
+            "uid": "JABRA-SOLEMATE",
+            "path": "/dev/snd/by-id/usb-0d8c_USB_Sound_Device-03",
+            "params": {
+                "rate": 48000
+            },
+            "source": {
+                "controls": {
+                    "volume": {
+                        "name": "Capture Volume"
+                    },
+                    "mute": {
+                        "name": "Capture Switch"
+                    }
+                },
+                "channels": [
+                    {
+                        "uid": "mic-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "mic-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "zones": [
+            {
+                "uid": "full-stereo",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            },
+            {
+                "uid": "front-seats",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            }
+        ],
+        "streams": [
+            {
+                "uid": "multimedia",
+                "verb": "multimedia",
+                "zone": "full-stereo",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "navigation",
+                "verb": "navigation",
+                "zone": "front-seats",
+                "volume": 70,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "emergency",
+                "verb": "emergency",
+                "zone": "front-seats",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            }
+        ]
+    }
+}
diff --git a/4a-hal-cfg-community/hal-4a-jabra.json b/4a-hal-cfg-community/hal-4a-jabra.json
new file mode 100644
index 0000000..e2d60d2
--- /dev/null
+++ b/4a-hal-cfg-community/hal-4a-jabra.json
@@ -0,0 +1,199 @@
+{
+    "$schema": "http://iot.bzh/download/public/schema/json/ctl-schema.json",
+    "metadata": {
+        "uid": "/dev/snd/by-id/usb-0d8c_USB_Sound_Device-02",
+        "version": "0.9",
+        "api": "4a-hal-jabra-solemate",
+        "require": [ "alsacore", "smixer" ],
+        "info": "4a hal for Jabra Solemate",
+        "author": "Jonathan Aillet",
+        "date": "2018-06-13"
+    },
+    "controls": [
+        {
+            "uid": "ping",
+            "info": "Ping hal",
+            "action": "api://4a-hal-manager#ping"
+        }
+    ],
+    "halmap": [
+        {
+            "uid": "agl-master-playback-volume",
+            "alsa": {
+                "name": "PCM Playback Volume",
+                "value": 80
+            }
+        },
+        {
+            "uid": "agl-pcm-playback-volume",
+            "alsa": {
+                "name": "PCM Playback Volume",
+                "value": 80
+            }
+        },
+        {
+            "uid": "agl-pcm-playback-switch",
+            "alsa": {
+                "name": "PCM Playback Switch",
+                "value": 1
+            }
+        },
+        {
+            "uid": "agl-mic-capture-volume",
+            "alsa": {
+                "name": "Mic Capture Volume"
+            }
+        }
+    ],
+    "halmixer": {
+        "uid": "jabra-solemate",
+        "mixerapi": "smixer",
+        "ramps": [
+            {
+                "uid": "ramp-very-fast",
+                "delay": 50,
+                "up": 6,
+                "down": 10
+            },
+            {
+                "uid": "ramp-fast",
+                "delay": 50,
+                "up": 2,
+                "down": 10
+            },
+            {
+                "uid": "ramp-normal",
+                "delay": 50,
+                "up": 2,
+                "down": 4
+            },
+            {
+                "uid": "ramp-slow",
+                "delay": 50,
+                "up": 2,
+                "down": 2
+            },
+            {
+                "uid": "ramp-very-slow",
+                "delay": 100,
+                "up": 1,
+                "down": 1
+            }
+        ],
+        "playbacks" : {
+            "uid": "JABRA-SOLEMATE",
+            "path": "/dev/snd/by-id/usb-0d8c_USB_Sound_Device-02",
+            "params": {
+                "rate": 48000
+            },
+            "sink": {
+                "controls": {
+                    "volume": {
+                        "name": "Speaker Playback Volume",
+                        "value": 80
+                    },
+                    "mute": {
+                        "name": "Speaker Playback Switch"
+                    }
+                },
+                "channels": [
+                    {
+                        "uid": "front-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "front-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "captures": {
+            "uid": "JABRA-SOLEMATE",
+            "path": "/dev/snd/by-id/usb-0d8c_USB_Sound_Device-02",
+            "params": {
+                "rate": 48000
+            },
+            "source": {
+                "controls": {
+                    "volume": {
+                        "name": "Capture Volume"
+                    },
+                    "mute": {
+                        "name": "Capture Switch"
+                    }
+                },
+                "channels": [
+                    {
+                        "uid": "mic-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "mic-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "zones": [
+            {
+                "uid": "full-stereo",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            },
+            {
+                "uid": "front-seats",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            }
+        ],
+        "streams": [
+            {
+                "uid": "multimedia",
+                "verb": "multimedia",
+                "zone": "full-stereo",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "navigation",
+                "verb": "navigation",
+                "zone": "front-seats",
+                "volume": 70,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "emergency",
+                "verb": "emergency",
+                "zone": "front-seats",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            }
+        ]
+    }
+}
diff --git a/4a-hal-cfg-reference/hal-4a-2ch-generic-usb.json b/4a-hal-cfg-reference/hal-4a-2ch-generic-usb.json
index 14eecbf..fdc3b19 100644
--- a/4a-hal-cfg-reference/hal-4a-2ch-generic-usb.json
+++ b/4a-hal-cfg-reference/hal-4a-2ch-generic-usb.json
@@ -7,7 +7,7 @@
         "require": [ "alsacore", "smixer" ],
         "info": "4a hal for 2ch generic USB device",
         "author": "Jonathan Aillet",
-        "date": "2018-06-09"
+        "date": "2018-06-13"
     },
     "controls": [
         {
@@ -51,6 +51,12 @@
         "mixerapi": "smixer",
         "ramps": [
             {
+                "uid": "ramp-very-fast",
+                "delay": 50,
+                "up": 6,
+                "down": 10
+            },
+            {
                 "uid": "ramp-fast",
                 "delay": 50,
                 "up": 2,
@@ -64,6 +70,12 @@
             },
             {
                 "uid": "ramp-slow",
+                "delay": 50,
+                "up": 2,
+                "down": 2
+            },
+            {
+                "uid": "ramp-very-slow",
                 "delay": 100,
                 "up": 1,
                 "down": 1
diff --git a/4a-hal-cfg-reference/hal-4a-intel-minnow.json b/4a-hal-cfg-reference/hal-4a-intel-minnow.json
new file mode 100644
index 0000000..0e78148
--- /dev/null
+++ b/4a-hal-cfg-reference/hal-4a-intel-minnow.json
@@ -0,0 +1,169 @@
+{
+    "$schema": "http://iot.bzh/download/public/schema/json/ctl-schema.json",
+    "metadata": {
+        "uid": "/dev/snd/by-path/pci-0000:00:1b.0",
+        "version": "0.9",
+        "api": "4a-hal-intel-minnow",
+        "require": [ "alsacore", "smixer" ],
+        "info": "4a hal for Intel Minnow device",
+        "author": "Jonathan Aillet",
+        "date": "2018-06-13"
+    },
+    "controls": [
+        {
+            "uid": "ping",
+            "info": "Ping hal",
+            "action": "api://4a-hal-manager#ping"
+        }
+    ],
+    "halmap": [
+        {
+            "uid": "agl-master-playback-volume",
+            "alsa": {
+                "name": "IEC958 Playback Switch",
+                "value": 100
+            }
+        },
+        {
+            "uid": "agl-pcm-playback-switch",
+            "alsa": {
+                "name": "IEC958 Playback Switch",
+                "value": 1
+            }
+        }
+    ],
+    "halmixer": {
+        "uid": "intel-minnow",
+        "mixerapi": "smixer",
+        "ramps": [
+            {
+                "uid": "ramp-very-fast",
+                "delay": 50,
+                "up": 6,
+                "down": 10
+            },
+            {
+                "uid": "ramp-fast",
+                "delay": 50,
+                "up": 2,
+                "down": 10
+            },
+            {
+                "uid": "ramp-normal",
+                "delay": 50,
+                "up": 2,
+                "down": 4
+            },
+            {
+                "uid": "ramp-slow",
+                "delay": 50,
+                "up": 2,
+                "down": 2
+            },
+            {
+                "uid": "ramp-very-slow",
+                "delay": 100,
+                "up": 1,
+                "down": 1
+            }
+        ],
+        "playbacks" : {
+            "uid": "INTEL-MINNOW",
+            "path": "/dev/snd/by-path/pci-0000:00:1b.0",
+            "params": {
+                "rate": 48000
+            },
+            "sink": {
+                "channels": [
+                    {
+                        "uid": "front-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "front-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "captures": {
+            "uid": "INTEL-MINNOW",
+            "path": "/dev/snd/by-path/pci-0000:00:1b.0",
+            "params": {
+                "rate": 48000
+            },
+            "source": {
+                "channels": [
+                    {
+                        "uid": "mic-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "mic-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "zones": [
+            {
+                "uid": "full-stereo",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            },
+            {
+                "uid": "front-seats",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            }
+        ],
+        "streams": [
+            {
+                "uid": "multimedia",
+                "verb": "multimedia",
+                "zone": "full-stereo",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "navigation",
+                "verb": "navigation",
+                "zone": "front-seats",
+                "volume": 70,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "emergency",
+                "verb": "emergency",
+                "zone": "front-seats",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            }
+        ]
+    }
+}
diff --git a/4a-hal-cfg-reference/hal-4a-intel.json b/4a-hal-cfg-reference/hal-4a-intel.json
new file mode 100644
index 0000000..d489c85
--- /dev/null
+++ b/4a-hal-cfg-reference/hal-4a-intel.json
@@ -0,0 +1,199 @@
+{
+    "$schema": "http://iot.bzh/download/public/schema/json/ctl-schema.json",
+    "metadata": {
+        "uid": "/dev/snd/by-path/pci-0000:00:1b.1",
+        "version": "0.9",
+        "api": "4a-hal-intel",
+        "require": [ "alsacore", "smixer" ],
+        "info": "4a hal for Intel device",
+        "author": "Jonathan Aillet",
+        "date": "2018-06-13"
+    },
+    "controls": [
+        {
+            "uid": "ping",
+            "info": "Ping hal",
+            "action": "api://4a-hal-manager#ping"
+        }
+    ],
+    "halmap": [
+        {
+            "uid": "agl-master-playback-volume",
+            "alsa": {
+                "name": "Master Playback Volume",
+                "value": 100
+            }
+        },
+        {
+            "uid": "agl-pcm-playback-volume",
+            "alsa": {
+                "name": "PCM Playback Volume",
+                "value": 100
+            }
+        },
+        {
+            "uid": "agl-master-playback-switch",
+            "alsa": {
+                "name": "Master Playback Switch",
+                "value": 1
+            }
+        },
+        {
+            "uid": "agl-capture-volume",
+            "alsa": {
+                "name": "Capture Volume"
+            }
+        }
+    ],
+    "halmixer": {
+        "uid": "intel",
+        "mixerapi": "smixer",
+        "ramps": [
+            {
+                "uid": "ramp-very-fast",
+                "delay": 50,
+                "up": 6,
+                "down": 10
+            },
+            {
+                "uid": "ramp-fast",
+                "delay": 50,
+                "up": 2,
+                "down": 10
+            },
+            {
+                "uid": "ramp-normal",
+                "delay": 50,
+                "up": 2,
+                "down": 4
+            },
+            {
+                "uid": "ramp-slow",
+                "delay": 50,
+                "up": 2,
+                "down": 2
+            },
+            {
+                "uid": "ramp-very-slow",
+                "delay": 100,
+                "up": 1,
+                "down": 1
+            }
+        ],
+        "playbacks" : {
+            "uid": "INTEL",
+            "path": "/dev/snd/by-path/pci-0000:00:1b.1",
+            "params": {
+                "rate": 48000
+            },
+            "sink": {
+                "controls": {
+                    "volume": {
+                        "name": "Master Playback Volume",
+                        "value": 80
+                    },
+                    "mute": {
+                        "name": "Master Playback Switch"
+                    }
+                },
+                "channels": [
+                    {
+                        "uid": "front-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "front-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "captures": {
+            "uid": "INTEL",
+            "path": "/dev/snd/by-path/pci-0000:00:1b.1",
+            "params": {
+                "rate": 48000
+            },
+            "source": {
+                "controls": {
+                    "volume": {
+                        "name": "Capture Volume"
+                    },
+                    "mute": {
+                        "name": "Capture Switch"
+                    }
+                },
+                "channels": [
+                    {
+                        "uid": "mic-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "mic-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "zones": [
+            {
+                "uid": "full-stereo",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            },
+            {
+                "uid": "front-seats",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            }
+        ],
+        "streams": [
+            {
+                "uid": "multimedia",
+                "verb": "multimedia",
+                "zone": "full-stereo",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "navigation",
+                "verb": "navigation",
+                "zone": "front-seats",
+                "volume": 70,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "emergency",
+                "verb": "emergency",
+                "zone": "front-seats",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            }
+        ]
+    }
+}
diff --git a/4a-hal-cfg-reference/hal-4a-rcar-m3.json b/4a-hal-cfg-reference/hal-4a-rcar-m3.json
new file mode 100644
index 0000000..0e5c67a
--- /dev/null
+++ b/4a-hal-cfg-reference/hal-4a-rcar-m3.json
@@ -0,0 +1,199 @@
+{
+    "$schema": "http://iot.bzh/download/public/schema/json/ctl-schema.json",
+    "metadata": {
+        "uid": "/dev/snd/by-path/platform-sound",
+        "version": "0.9",
+        "api": "4a-hal-rcar-m3",
+        "require": [ "alsacore", "smixer" ],
+        "info": "4a hal for Rcar M3 device",
+        "author": "Jonathan Aillet",
+        "date": "2018-06-13"
+    },
+    "controls": [
+        {
+            "uid": "ping",
+            "info": "Ping hal",
+            "action": "api://4a-hal-manager#ping"
+        }
+    ],
+    "halmap": [
+        {
+            "uid": "agl-master-playback-volume",
+            "alsa": {
+                "name": "Digital Playback Volume1",
+                "value": 80
+            }
+        },
+        {
+            "uid": "agl-pcm-playback-volume",
+            "alsa": {
+                "name": "Digital Playback Volume1",
+                "value": 80
+            }
+        },
+        {
+            "uid": "agl-pcm-playback-switch",
+            "alsa": {
+                "name": "SRC Out Rate Switch",
+                "value": 1
+            }
+        },
+        {
+            "uid": "agl-capture-volume",
+            "alsa": {
+                "name": "DVC In Capture Volume"
+            }
+        }
+    ],
+    "halmixer": {
+        "uid": "rcar-m3",
+        "mixerapi": "smixer",
+        "ramps": [
+            {
+                "uid": "ramp-very-fast",
+                "delay": 50,
+                "up": 6,
+                "down": 10
+            },
+            {
+                "uid": "ramp-fast",
+                "delay": 50,
+                "up": 2,
+                "down": 10
+            },
+            {
+                "uid": "ramp-normal",
+                "delay": 50,
+                "up": 2,
+                "down": 4
+            },
+            {
+                "uid": "ramp-slow",
+                "delay": 50,
+                "up": 2,
+                "down": 2
+            },
+            {
+                "uid": "ramp-very-slow",
+                "delay": 100,
+                "up": 1,
+                "down": 1
+            }
+        ],
+        "playbacks" : {
+            "uid": "RCAR-M3",
+            "path": "/dev/snd/by-path/platform-sound",
+            "params": {
+                "rate": 48000
+            },
+            "sink": {
+                "controls": {
+                    "volume": {
+                        "name": "Digital Playback Volume1",
+                        "value": 80
+                    },
+                    "mute": {
+                        "name": "SRC Out Rate Switch"
+                    }
+                },
+                "channels": [
+                    {
+                        "uid": "front-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "front-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "captures": {
+            "uid": "RCAR-M3",
+            "path": "/dev/snd/by-path/platform-sound",
+            "params": {
+                "rate": 48000
+            },
+            "source": {
+                "controls": {
+                    "volume": {
+                        "name": "DVC In Capture Volume"
+                    },
+                    "mute": {
+                        "name": "DVC In Mute Switch"
+                    }
+                },
+                "channels": [
+                    {
+                        "uid": "mic-right",
+                        "port": 0
+                    },
+                    {
+                        "uid": "mic-left",
+                        "port": 1
+                    }
+                ]
+            }
+        },
+        "zones": [
+            {
+                "uid": "full-stereo",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            },
+            {
+                "uid": "front-seats",
+                "sink": [
+                    {
+                        "target": "front-right",
+                        "channel": 0
+                    },
+                    {
+                        "target": "front-left",
+                        "channel": 1
+                    }
+                ]
+            }
+        ],
+        "streams": [
+            {
+                "uid": "multimedia",
+                "verb": "multimedia",
+                "zone": "full-stereo",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "navigation",
+                "verb": "navigation",
+                "zone": "front-seats",
+                "volume": 70,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            },
+            {
+                "uid": "emergency",
+                "verb": "emergency",
+                "zone": "front-seats",
+                "volume": 60,
+                "mute": false,
+                "params": {
+                    "rate": 48000
+                }
+            }
+        ]
+    }
+}
diff --git a/README.md b/README.md
index d693ff0..2d805e7 100644
--- a/README.md
+++ b/README.md
@@ -131,13 +131,20 @@ sudo modprobe snd-aloop
       * The `params` is where you can specify some parameters for your stream (such as rate).
       * `volume` and `mute` fields are initiate values of the stream.
 
-#### Note about using a USB device
+### Note about using a USB device
 
 Dynamic handling of USB devices is not yet implemented, so you need to modify the 'hal-4a-2ch-generic-usb.json'
 to change the `uid` value in `metadata` section and `path` values in `playbacks` and `captures` sections.
 All these values should be replaced by the alsa entry path of your usb device, these entry are listed
 under directory '/dev/snd/by-id/...'.
 
+### Selection of the hal loaded at binding launch
+
+Currently, the 4a-hal binding will try to launch a hal for each json audio configuration
+files found in path specified with CONTROL_CONFIG_PATH (an audio configuration file should begin with 4a-hal-*).
+If you don't want a hal to be launch with the binding, you can just rename/remove the corresponding
+audio json configuration file.
+
 ## Compile (for each repositories)
 
 ```bash