Merge pull request #5 from tjahnk/create_hal_unicens

Introducing HAL MOST UNICENS

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+
+# HAL for MOST Sound Card
+
+## Introduction
+This Hardware Abstraction Layer (HAL) is intended to control MOST audio via
+standard ALSA mixer controls. Therefore the HAL add's controls to the MOST sound
+card. Modification of the mixer controls is mapped to control commands which are
+send to MOST nodes.
+
+The HAL requires to access the UNICENS V2 binding which is setting up the MOST
+network and the MOST node.
+
+Please check the following required components:
+* MOST Linux Driver
+* User must be member of "audio" group
+* UNICENS V2 binding
+* [K2L MOST150 Audio 5.1 Kit](https://www.k2l.de/products/74/MOST150%20Audio%205.1%20Kit/)
+
+## Possible Modifications
+Check if you need to adapt the default path for UNICENS configuration, e.g.
+```
+#define XML_CONFIG_PATH "/opt/AGL/unicens2-binding/config_multichannel_audio_kit.xml"
+```
+
+Check if you need to adapt the name of the MOST sound card.
+```
+#define ALSA_CARD_NAME  "Microchip MOST:1"
+```
+
+You can check your MOST sound card name by calling ```aplay -l```, e.g.
+```
+aplay -l
+**** List of PLAYBACK Hardware Devices ****
+card 0: PCH [HDA Intel PCH], device 0: 92HD90BXX Analog [92HD90BXX Analog]
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+card 1: ep016ch [Microchip MOST:1], device 0: ep01-6ch []
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+card 2: ep022ch [Microchip MOST:2], device 0: ep02-2ch []
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+
+```
+Choose the first sound card with 6 channels, e.g. if you see ```ep01-6ch``` just 
+take ```Microchip MOST:1```.
+
+If you get messed up with card enumeration the following action may help:
+- Unplug your MOST USB hardware from target
+- Call ```sudo rm /var/lib/alsa/asound.state```
+- Connect MOST USB hardware after reboot or restart of ALSA