tuna: Add ambient temperature sensor.

This leverages the BMP180's ability to sense the temperature.

Requires kernel change, but there are no adverse side-effects without the kernel change.

Change-Id: Ibe2228d0ab30775556acb0a034f7f0904ed1b0b7
Signed-off-by: Kyle Repinski <repinski23@gmail.com>

Conflicts:
	libsensors/sensors.cpp

5 files changed, 104 insertions, 2 deletions

diff --git a/libsensors/Android.mk b/libsensors/Android.mk
index 8be82f2..fe65a91 100644
--- a/libsensors/Android.mk
+++ b/libsensors/Android.mk
@@ -33,7 +33,8 @@ LOCAL_SRC_FILES := \
 	LightSensor.cpp \
 	ProximitySensor.cpp \
 	PressureSensor.cpp \
-	SamsungSensorBase.cpp
+	SamsungSensorBase.cpp \
+	TemperatureSensor.cpp
 
 LOCAL_SHARED_LIBRARIES := libinvensense_hal liblog libcutils libutils libdl
 
diff --git a/libsensors/TemperatureSensor.cpp b/libsensors/TemperatureSensor.cpp
new file mode 100644
index 0000000..74a6cd5
--- /dev/null
+++ b/libsensors/TemperatureSensor.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2011 Samsung
+ *
+ * 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.
+ */
+
+#include <fcntl.h>
+#include <errno.h>
+#include <math.h>
+#include <poll.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <sys/select.h>
+#include <cutils/log.h>
+#include <pthread.h>
+
+#include "TemperatureSensor.h"
+
+#define TEMPERATURE_CELCIUS (1.0f/10.0f)
+
+TemperatureSensor::TemperatureSensor()
+    : SamsungSensorBase(NULL, "barometer", ABS_MISC)
+{
+    mPendingEvent.sensor = ID_T;
+    mPendingEvent.type = SENSOR_TYPE_AMBIENT_TEMPERATURE;
+}
+
+bool TemperatureSensor::handleEvent(input_event const *event) {
+    mPendingEvent.temperature = event->value * TEMPERATURE_CELCIUS;
+    return true;
+}
diff --git a/libsensors/TemperatureSensor.h b/libsensors/TemperatureSensor.h
new file mode 100644
index 0000000..2fe23e1
--- /dev/null
+++ b/libsensors/TemperatureSensor.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2011 Samsung
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_TEMPERATURE_SENSOR_H
+#define ANDROID_TEMPERATURE_SENSOR_H
+
+#include <stdint.h>
+#include <errno.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#include "sensors.h"
+#include "SamsungSensorBase.h"
+#include "InputEventReader.h"
+
+/*****************************************************************************/
+
+struct input_event;
+
+class TemperatureSensor:public SamsungSensorBase {
+    virtual bool handleEvent(input_event const * event);
+
+public:
+    TemperatureSensor();
+};
+
+/*****************************************************************************/
+
+#endif /* ANDROID_TEMPERATURE_SENSOR_H */
diff --git a/libsensors/sensors.cpp b/libsensors/sensors.cpp
index c0ad385..0065653 100644
--- a/libsensors/sensors.cpp
+++ b/libsensors/sensors.cpp
@@ -39,6 +39,7 @@
 #include "LightSensor.h"
 #include "ProximitySensor.h"
 #include "PressureSensor.h"
+#include "TemperatureSensor.h"
 
 
 /*****************************************************************************/
@@ -57,6 +58,7 @@
 #define SENSORS_LIGHT            (1<<ID_L)
 #define SENSORS_PROXIMITY        (1<<ID_P)
 #define SENSORS_PRESSURE         (1<<ID_PR)
+#define SENSORS_TEMPERATURE      (1<<ID_T)
 
 #define SENSORS_ROTATION_VECTOR_HANDLE  (ID_RV)
 #define SENSORS_LINEAR_ACCEL_HANDLE     (ID_LA)
@@ -68,6 +70,7 @@
 #define SENSORS_LIGHT_HANDLE            (ID_L)
 #define SENSORS_PROXIMITY_HANDLE        (ID_P)
 #define SENSORS_PRESSURE_HANDLE         (ID_PR)
+#define SENSORS_TEMPERATURE_HANDLE      (ID_T)
 #define AKM_FTRACE 0
 #define AKM_DEBUG 0
 #define AKM_DATA 0
@@ -75,7 +78,7 @@
 /*****************************************************************************/
 
 /* The SENSORS Module */
-#define LOCAL_SENSORS (3)
+#define LOCAL_SENSORS (4)
 static struct sensor_t sSensorList[LOCAL_SENSORS + MPLSensor::numSensors] = {
       { "GP2A Light sensor",
           "Sharp",
@@ -95,6 +98,12 @@ static struct sensor_t sSensorList[LOCAL_SENSORS + MPLSensor::numSensors] = {
           SENSOR_TYPE_PRESSURE, 1100.0f, 0.01f, 0.67f, 20000, 0, 0, 0, 0, 20000,
 	  SENSOR_FLAG_CONTINUOUS_MODE,
 	  { } },
+      { "BMP180 Temperature sensor",
+          "Bosch",
+          1, SENSORS_TEMPERATURE_HANDLE,
+          SENSOR_TYPE_AMBIENT_TEMPERATURE, 850.0f, 0.1f, 0.67f, 20000, 0, 0, 0, 0, 20000,
+          SENSOR_FLAG_CONTINUOUS_MODE,
+      { } }
 };
 static int numSensors = LOCAL_SENSORS;
 
@@ -145,6 +154,7 @@ private:
         light,
         proximity,
         pressure,
+        temperature,
         numSensorDrivers,       // wake pipe goes here
         mpl_power,              //special handle for MPL pm interaction
         numFds,
@@ -172,6 +182,8 @@ private:
                 return proximity;
             case ID_PR:
                 return pressure;
+            case ID_T:
+                return temperature;
         }
         return -EINVAL;
     }
@@ -219,6 +231,11 @@ sensors_poll_context_t::sensors_poll_context_t()
     mPollFds[pressure].events = POLLIN;
     mPollFds[pressure].revents = 0;
 
+    mSensors[temperature] = new TemperatureSensor();
+    mPollFds[temperature].fd = mSensors[temperature]->getFd();
+    mPollFds[temperature].events = POLLIN;
+    mPollFds[temperature].revents = 0;
+
     int wakeFds[2];
     int result = pipe(wakeFds);
     ALOGE_IF(result<0, "error creating wake pipe (%s)", strerror(errno));
diff --git a/libsensors/sensors.h b/libsensors/sensors.h
index a7e077d..18517f9 100644
--- a/libsensors/sensors.h
+++ b/libsensors/sensors.h
@@ -37,6 +37,7 @@ __BEGIN_DECLS
 #define ID_L  (ID_SAMSUNG_BASE)
 #define ID_P  (ID_L + 1)
 #define ID_PR (ID_P + 1)
+#define ID_T  (ID_PR + 1)
 
 /*****************************************************************************/