hidl:thermal: Add README.md and template config

Change-Id: Ie7d3b0bccacb7568cd4523483452eb386d21fc9e

hidl/thermal/README.md

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+# Samsung HIDL thermal HAL
+
+The HAL uses the standard linux thermal interface and can be configured by
+adding thermal zones and cooling devices present on the device in a
+`thermal_info_config.json` file.
+
+To probe them, just connect the phone via ADB and check the nodes available
+under `/sys/class/thermal/`.  The name of each thermal zone and cooling device
+can be found in the type node, e.g.
+
+    /sys/class/thermal/thermal_zone0/type
+    /sys/class/thermal/cooling_device0/type
+
+For each thermal device it is possible to configure a "Sensor" node in
+`thermal_info_config.json`, and setting up to 7 throttling levels, from NONE to
+SHUTDOWN. At each severity level, the hal send signals to throttle the device to the 
+framework, according to : https://source.android.com/devices/architecture/hidl/thermal-mitigation
+In order to set temperature curve for the desired component you can 
+took as a refererence the kernel trip points temperatures, for the specific devices,
+available in the thermal_zoneX sysfs.
+Each sensor can be classified as *CPU*, *GPU*, *USB_PORT* or *BATTERY* type.
+If you have a thermal monitor which does not belong to any of this categories you can 
+classify it as *UNKNOWN*.
+You can specify hysteresis as well as if the interface should be monitored.
+If you monitor the interface, the HAL takes action when the specifc treshold is passed.
+You should not enable monitor if your kernel already implement thermal mitigatoin for 
+the specified component.
+Since each device reports temperatures multiplied by different factor of 10,
+you should set the Multipler field such as
+`/sys/class/thermal/thermal_zoneX/temp` is reported in Celusis degrees (e.g.
+25100 reported by sysfs, multiplied by 0.001 is 25.1).
+
+The same can be said for cooling devices. For each cooling devices can be
+created a CoolingDevices node in `thermal_info_config.json`.
+Each cooling interface can be classified as *CPU*, *GPU* or *BATTERY* type.
+If you have a cooling device which does not belong to any of this categories you can 
+classify it as *COMPONENT*.
+The `thermal_info_config.json` should be copied under /vendor/etc.
+
+For more details, refer on the sample config schema.

hidl/thermal/thermal_info_config_template.json

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+{
+    "Sensors":[
+        {
+            "Name":"therm_zone0",
+            "Type":"CPU",
+            "HotThreshold":[
+                "NAN",
+                76.0,
+                81.0,
+                86.0,
+                96.0,
+                101.0,
+                115.0
+            ],
+            "VrThreshold":"NAN",
+            "Multiplier":0.001
+        },
+        {
+            "Name":"therm_zone1",
+            "Type":"CPU",
+            "HotThreshold":[
+                "NAN",
+                76.0,
+                81.0,
+                86.0,
+                96.0,
+                101.0,
+                115.0
+            ],
+            "VrThreshold":"NAN",
+            "Multiplier":0.001
+        },
+        {
+            "Name":"therm_zone2",
+            "Type":"CPU",
+            "HotThreshold":[
+                "NAN",
+                76.0,
+                81.0,
+                86.0,
+                96.0,
+                101.0,
+                115.0
+            ],
+            "VrThreshold":"NAN",
+            "Multiplier":0.001
+        },
+        {
+            "Name":"therm_zone3",
+            "Type":"CPU",
+            "HotThreshold":[
+                "NAN",
+                76.0,
+                81.0,
+                86.0,
+                96.0,
+                101.0,
+                115.0
+            ],
+            "VrThreshold":"NAN",
+            "Multiplier":0.001
+        },
+        {
+            "Name":"therm_zone4",
+            "Type":"CPU",
+            "HotThreshold":[
+                "NAN",
+                76.0,
+                81.0,
+                86.0,
+                96.0,
+                101.0,
+                115.0
+            ],
+            "VrThreshold":"NAN",
+            "Multiplier":0.001
+        },
+        {
+            "Name":"ac",
+            "Type":"USB_PORT",
+            "HotThreshold":[
+                "NAN",
+                "NAN",
+                "NAN",
+                "NAN",
+                "NAN",
+                "60.0",
+                "NAN"
+            ],
+            "HotHysteresis":[
+                0.0,
+                0.0,
+                0.0,
+                0.0,
+                0.0,
+                5.0,
+                0.0
+            ],
+            "VrThreshold":"NAN",
+            "Multiplier":0.001,
+            "Monitor": true
+        },
+        {
+            "Name":"max77854-fuelgauge",
+            "Type":"UNKNOWN",
+            "HotThreshold":[
+                "NAN",
+                "NAN",
+                "NAN",
+                "NAN",
+                "NAN",
+                "NAN",
+                "NAN"
+            ],
+            "VrThreshold":"NAN",
+            "Multiplier":0.001
+        },
+        {
+            "Name":"battery",
+            "Type":"BATTERY",
+            "HotThreshold":[
+                "NAN",
+                "NAN",
+                "NAN",
+                "NAN",
+                "NAN",
+                "NAN",
+                60.0
+            ],
+            "VrThreshold":"NAN",
+            "Multiplier":0.001
+        }
+    ],
+    "CoolingDevices":[
+        {
+            "Name":"thermal-cpufreq-0",
+            "Type":"CPU"
+        },
+        {
+            "Name":"thermal-cpufreq-1",
+            "Type":"CPU"
+        },
+        {
+            "Name":"thermal-cpufreq-2",
+            "Type":"CPU"
+        },
+        {
+            "Name":"thermal-gpufreq-0",
+            "Type":"GPU"
+        },
+        {
+            "Name":"thermal-isp-0",
+            "Type":"COMPONENT"
+        },
+        {
+            "Name":"battery",
+            "Type":"BATTERY"
+        }        
+    ]
+}