libsensors: Added support for Pressure sensor

This patch adds the HAL specific changes for Pressure Sensor.
This uses IIO model to communicate to kernel driver.
This exposes pressure data in hPa format.

Change-Id: I7242be355885a0860de0fb496de800bc7b212ca3
Signed-off-by: Archana Patni <archana.patni@intel.com>
Reviewed-on: https://android.intel.com/162268
Reviewed-by: Persson, Per <per.persson@intel.com>
Reviewed-by: Sesha, Subramony <subramony.sesha@intel.com>
Tested-by: sys_abtbuild <sys_abtbuild@intel.com>
Reviewed-by: Lilja, Ola <ola.lilja@intel.com>

diff --git a/HidSensor_Pressure.cpp b/HidSensor_Pressure.cpp
new file mode 100644 (file)
index 0000000..d0ef12c
--- /dev/null
+++ b/HidSensor_Pressure.cpp
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * 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 "common.h"
+#include "SensorConfig.h"
+#include "HidSensor_Pressure.h"
+
+#define CHANNEL_PR 0
+
+/* TODO: POWERCONSUMP_PRESS, PRESS_MINDELAY replace or fill that macros */
+#define POWERCONSUMP_PRESS      0.11f
+#define PRESS_MINDELAY         0
+#define RANGE_PRESS                 1260
+#define RESOLUTION_PRESS        0.0f
+
+struct pressure_sample{
+    unsigned int pressure_s; /* TODO: check type: too short? */
+} __packed;
+
+const struct sensor_t PressureSensor::sSensorInfo_pressure = {
+    "HID_SENSOR Barometer Sensor", "Intel", 1, SENSORS_PRESSURE_HANDLE,
+        SENSOR_TYPE_PRESSURE, RANGE_PRESS, RESOLUTION_PRESS, POWERCONSUMP_PRESS, PRESS_MINDELAY,0,0,{}
+};
+
+const long HID_USAGE_SENSOR_UNITS_PASCAL = 0xF1E1;
+const long UNIT_EXPO_DEC_BASE = 0x0F;
+const int retry_cnt = 5;
+
+
+PressureSensor::PressureSensor(): SensorIIODev("press", "in_pressure_scale", "in_pressure_offset", "in_pressure_", retry_cnt){
+    ALOGV(">>PressureSensor 3D: constructor!");
+    mPendingEvent.version = sizeof(sensors_event_t);
+    mPendingEvent.sensor = ID_PR;
+    mPendingEvent.type = SENSOR_TYPE_PRESSURE;
+    memset(mPendingEvent.data, 0, sizeof(mPendingEvent.data));
+    sample_delay_min_ms = 500;
+    ALOGV("<<PressureSensor 3D: constructor!");
+}
+
+int PressureSensor::processEvent(unsigned char *raw_data, size_t raw_data_len){
+    struct pressure_sample *sample;
+
+    ALOGV(">>%s", __func__);
+    if (IsDeviceInitialized() == false){
+        ALOGE("Device was not initialized \n");
+        return  - 1;
+    } if (raw_data_len < sizeof(struct pressure_sample)){
+        ALOGE("Insufficient length \n");
+        return  - 1;
+    }
+    sample = (struct pressure_sample*)raw_data;
+    ALOGV("Pressure:%2x",  sample->pressure_s);
+
+    mPendingEvent.data[0] = mPendingEvent.pressure =
+               CONVERT_PR_HPA_VTF16E14(GetChannelBytesUsedSize(CHANNEL_PR), GetExponentValue(), sample->pressure_s);
+
+    ALOGV("PRESSURE Sample %f(hPa=Pa/100)\n", mPendingEvent.pressure);
+    ALOGV("<<%s", __func__);
+    return 0;
+}

diff --git a/HidSensor_Pressure.h b/HidSensor_Pressure.h
new file mode 100644 (file)
index 0000000..79080f3
--- /dev/null
+++ b/HidSensor_Pressure.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * 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 HIDSENSOR_PRESSURE_H
+#define HIDSENSOR_PRESSURE_H
+
+#include <stdint.h>
+#include <errno.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#include "SensorIIODev.h"
+#include "Helpers.h"
+
+class PressureSensor : public SensorIIODev {
+
+public:
+    PressureSensor();
+    virtual int processEvent(unsigned char *raw_data, size_t raw_data_len);
+    static const struct sensor_t sSensorInfo_pressure;
+};
+
+#endif