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-rw-r--r--sensors/akmdfs/AK8975Driver.c318
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diff --git a/sensors/akmdfs/AK8975Driver.c b/sensors/akmdfs/AK8975Driver.c
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+/******************************************************************************
+ *
+ * Copyright (C) 2012 Asahi Kasei Microdevices Corporation, Japan
+ *
+ * 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 "AKFS_Common.h"
+#include "AK8975Driver.h"
+
+#define MSENSOR_NAME "/dev/akm8975_dev"
+
+static int s_fdDev = -1;
+
+/*!
+ Open device driver.
+ This function opens both device drivers of magnetic sensor and acceleration
+ sensor. Additionally, some initial hardware settings are done, such as
+ measurement range, built-in filter function and etc.
+ @return If this function succeeds, the return value is #AKD_SUCCESS.
+ Otherwise the return value is #AKD_FAIL.
+ */
+int16_t AKD_InitDevice(void)
+{
+ if (s_fdDev < 0) {
+ /* Open magnetic sensor's device driver. */
+ if ((s_fdDev = open(MSENSOR_NAME, O_RDWR)) < 0) {
+ AKMERROR_STR("open");
+ return AKD_FAIL;
+ }
+ }
+
+ return AKD_SUCCESS;
+}
+
+/*!
+ Close device driver.
+ This function closes both device drivers of magnetic sensor and acceleration
+ sensor.
+ */
+void AKD_DeinitDevice(void)
+{
+ if (s_fdDev >= 0) {
+ close(s_fdDev);
+ s_fdDev = -1;
+ }
+}
+
+/*!
+ Writes data to a register of the AK8975. When more than one byte of data is
+ specified, the data is written in contiguous locations starting at an address
+ specified in \a address.
+ @return If this function succeeds, the return value is #AKD_SUCCESS. Otherwise
+ the return value is #AKD_FAIL.
+ @param[in] address Specify the address of a register in which data is to be
+ written.
+ @param[in] data Specify data to write or a pointer to a data array containing
+ the data. When specifying more than one byte of data, specify the starting
+ address of the array.
+ @param[in] numberOfBytesToWrite Specify the number of bytes that make up the
+ data to write. When a pointer to an array is specified in data, this argument
+ equals the number of elements of the array.
+ */
+int16_t AKD_TxData(
+ const BYTE address,
+ const BYTE * data,
+ const uint16_t numberOfBytesToWrite)
+{
+ int i;
+ char buf[RWBUF_SIZE];
+
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+ if (numberOfBytesToWrite > (RWBUF_SIZE-2)) {
+ ALOGE("%s: Tx size is too large.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+
+ buf[0] = numberOfBytesToWrite + 1;
+ buf[1] = address;
+
+ for (i = 0; i < numberOfBytesToWrite; i++) {
+ buf[i + 2] = data[i];
+ }
+ if (ioctl(s_fdDev, ECS_IOCTL_WRITE, buf) < 0) {
+ AKMERROR_STR("ioctl");
+ return AKD_FAIL;
+ } else {
+
+#if ENABLE_AKMDEBUG
+ AKMDATA(AKMDATA_DRV, "addr(HEX)=%02x data(HEX)=", address);
+ for (i = 0; i < numberOfBytesToWrite; i++) {
+ AKMDATA(AKMDATA_DRV, " %02x", data[i]);
+ }
+ AKMDATA(AKMDATA_DRV, "\n");
+#endif
+ return AKD_SUCCESS;
+ }
+}
+
+/*!
+ Acquires data from a register or the EEPROM of the AK8975.
+ @return If this function succeeds, the return value is #AKD_SUCCESS. Otherwise
+ the return value is #AKD_FAIL.
+ @param[in] address Specify the address of a register from which data is to be
+ read.
+ @param[out] data Specify a pointer to a data array which the read data are
+ stored.
+ @param[in] numberOfBytesToRead Specify the number of bytes that make up the
+ data to read. When a pointer to an array is specified in data, this argument
+ equals the number of elements of the array.
+ */
+int16_t AKD_RxData(
+ const BYTE address,
+ BYTE * data,
+ const uint16_t numberOfBytesToRead)
+{
+ int i;
+ char buf[RWBUF_SIZE];
+
+ memset(data, 0, numberOfBytesToRead);
+
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+ if (numberOfBytesToRead > (RWBUF_SIZE-1)) {
+ ALOGE("%s: Rx size is too large.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+
+ buf[0] = numberOfBytesToRead;
+ buf[1] = address;
+
+ if (ioctl(s_fdDev, ECS_IOCTL_READ, buf) < 0) {
+ AKMERROR_STR("ioctl");
+ return AKD_FAIL;
+ } else {
+ for (i = 0; i < numberOfBytesToRead; i++) {
+ data[i] = buf[i + 1];
+ }
+#if ENABLE_AKMDEBUG
+ AKMDATA(AKMDATA_DRV, "addr(HEX)=%02x len=%d data(HEX)=",
+ address, numberOfBytesToRead);
+ for (i = 0; i < numberOfBytesToRead; i++) {
+ AKMDATA(AKMDATA_DRV, " %02x", data[i]);
+ }
+ AKMDATA(AKMDATA_DRV, "\n");
+#endif
+ return AKD_SUCCESS;
+ }
+}
+
+/*!
+ Acquire magnetic data from AK8975. If measurement is not done, this function
+ waits until measurement completion.
+ @return If this function succeeds, the return value is #AKD_SUCCESS. Otherwise
+ the return value is #AKD_FAIL.
+ @param[out] data A magnetic data array. The size should be larger than #SENSOR_DATA_SIZE.
+ */
+int16_t AKD_GetMagneticData(BYTE data[SENSOR_DATA_SIZE])
+{
+ memset(data, 0, SENSOR_DATA_SIZE);
+
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+
+ if (ioctl(s_fdDev, ECS_IOCTL_GETDATA, data) < 0) {
+ AKMERROR_STR("ioctl");
+ return AKD_FAIL;
+ }
+
+ AKMDATA(AKMDATA_DRV,
+ "bdata(HEX)= %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7]);
+
+ return AKD_SUCCESS;
+}
+
+/*!
+ Set calculated data to device driver.
+ @param[in] buf The order of input data depends on driver's specification.
+ */
+void AKD_SetYPR(const int buf[YPR_DATA_SIZE])
+{
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.", __FUNCTION__);
+ } else {
+ if (ioctl(s_fdDev, ECS_IOCTL_SET_YPR, buf) < 0) {
+ AKMERROR_STR("ioctl");
+ }
+ }
+}
+
+/*!
+ */
+int AKD_GetOpenStatus(int* status)
+{
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+ if (ioctl(s_fdDev, ECS_IOCTL_GET_OPEN_STATUS, status) < 0) {
+ AKMERROR_STR("ioctl");
+ return AKD_FAIL;
+ }
+ return AKD_SUCCESS;
+}
+
+/*!
+ */
+int AKD_GetCloseStatus(int* status)
+{
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+ if (ioctl(s_fdDev, ECS_IOCTL_GET_CLOSE_STATUS, status) < 0) {
+ AKMERROR_STR("ioctl");
+ return AKD_FAIL;
+ }
+ return AKD_SUCCESS;
+}
+
+/*!
+ Set AK8975 to the specific mode.
+ @return If this function succeeds, the return value is #AKD_SUCCESS. Otherwise
+ the return value is #AKD_FAIL.
+ @param[in] mode This value should be one of the AK8975_Mode which is defined in
+ akm8975.h file.
+ */
+int16_t AKD_SetMode(const BYTE mode)
+{
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+
+ if (ioctl(s_fdDev, ECS_IOCTL_SET_MODE, &mode) < 0) {
+ AKMERROR_STR("ioctl");
+ return AKD_FAIL;
+ }
+
+ return AKD_SUCCESS;
+}
+
+/*!
+ Acquire delay
+ @return If this function succeeds, the return value is #AKD_SUCCESS. Otherwise
+ the return value is #AKD_FAIL.
+ @param[out] delay A delay in nanosecond.
+ */
+int16_t AKD_GetDelay(int64_t delay[AKM_NUM_SENSORS])
+{
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.\n", __FUNCTION__);
+ return AKD_FAIL;
+ }
+ if (ioctl(s_fdDev, ECS_IOCTL_GET_DELAY, delay) < 0) {
+ AKMERROR_STR("ioctl");
+ return AKD_FAIL;
+ }
+ return AKD_SUCCESS;
+}
+
+/*!
+ Get layout information from device driver, i.e. platform data.
+ */
+int16_t AKD_GetLayout(int16_t* layout)
+{
+ char tmp;
+
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+
+ if (ioctl(s_fdDev, ECS_IOCTL_GET_LAYOUT, &tmp) < 0) {
+ AKMERROR_STR("ioctl");
+ return AKD_FAIL;
+ }
+
+ *layout = tmp;
+ return AKD_SUCCESS;
+}
+
+/* Get acceleration data. */
+int16_t AKD_GetAccelerationData(int16_t data[3])
+{
+ if (s_fdDev < 0) {
+ ALOGE("%s: Device file is not opened.", __FUNCTION__);
+ return AKD_FAIL;
+ }
+ if (ioctl(s_fdDev, ECS_IOCTL_GET_ACCEL, data) < 0) {
+ AKMERROR_STR("ioctl");
+ return AKD_FAIL;
+ }
+
+ AKMDATA(AKMDATA_DRV, "%s: acc=%d, %d, %d\n",
+ __FUNCTION__, data[0], data[1], data[2]);
+
+ return AKD_SUCCESS;
+}