src/chip-C/ant_native_chardev.c - LeafOS-Project/android_external_ant-wireless_hidl - Gitiles

 /*
  * ANT Stack
  *
  * Copyright 2011 Dynastream Innovations
  *
  * 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.
  */
 /*******************************************************************************\
 *
 *   FILE NAME:     ant_native_chardev.c
 *
 *   BRIEF:
 *      This file provides the character device implementation of ant_native.h
 *
 *
 \*******************************************************************************/

 #include <errno.h>
 #include <fcntl.h> /* for open() */
 #include <linux/ioctl.h>
 #include <pthread.h>

 #include "ant_native.h"
 #include "ant_types.h"
 #include "ant_log.h"
 #include "ant_version.h"

 #include "ant_native_chardev.h"
 #include "ant_rx_chardev.h"

 #define MESG_BROADCAST_DATA_ID               ((ANT_U8)0x4E)
 #define MESG_ACKNOWLEDGED_DATA_ID            ((ANT_U8)0x4F)
 #define MESG_BURST_DATA_ID                   ((ANT_U8)0x50)
 #define MESG_EXT_BROADCAST_DATA_ID           ((ANT_U8)0x5D)
 #define MESG_EXT_ACKNOWLEDGED_DATA_ID        ((ANT_U8)0x5E)
 #define MESG_EXT_BURST_DATA_ID               ((ANT_U8)0x5F)

 static ant_rx_thread_info_t stRxThreadInfo;
 static pthread_mutex_t stEnabledStatusLock = PTHREAD_MUTEX_INITIALIZER;
 static pthread_mutex_t stFlowControlLock = PTHREAD_MUTEX_INITIALIZER;
 static pthread_cond_t stFlowControlCond = PTHREAD_COND_INITIALIZER;
 ANTNativeANTStateCb g_fnStateCallback;

 static void ant_channel_init(ant_channel_info_t *pstChnlInfo, const char *pcCharDevName)
 {
    pstChnlInfo->pcDevicePath = pcCharDevName;
    pstChnlInfo->iFd = -1;
    pstChnlInfo->fnRxCallback = NULL;
    pstChnlInfo->ucFlowControlResp = FLOW_GO;
    pstChnlInfo->pstFlowControlCond = &stFlowControlCond;
    pstChnlInfo->pstFlowControlLock = &stFlowControlLock;
 }

 ANTStatus ant_init(void)
 {
    ANTStatus uiRet = ANT_STATUS_FAILED;
    ANT_FUNC_START();
    stRxThreadInfo.stRxThread = 0;
    stRxThreadInfo.ucRunThread = 0;
    stRxThreadInfo.ucChipResetting = 0;
    stRxThreadInfo.pstEnabledStatusLock = &stEnabledStatusLock;
    g_fnStateCallback = 0;
    ant_channel_init(&stRxThreadInfo.astChannels[COMMAND_CHANNEL], ANT_COMMANDS_DEVICE_NAME);
    ant_channel_init(&stRxThreadInfo.astChannels[DATA_CHANNEL], ANT_DATA_DEVICE_NAME);
    uiRet = ANT_STATUS_SUCCESS;
    ANT_FUNC_END();
    return uiRet;
 }

 ANTStatus ant_deinit(void)
 {
    ANTStatus uiRet = ANT_STATUS_FAILED;
    ANT_FUNC_START();
    uiRet = ANT_STATUS_SUCCESS;
    ANT_FUNC_END();
    return uiRet;
 }

 ANTStatus set_ant_rx_callback(ANTNativeANTEventCb rx_callback_func)
 {
    ANT_FUNC_START();
    stRxThreadInfo.astChannels[COMMAND_CHANNEL].fnRxCallback = rx_callback_func;
    stRxThreadInfo.astChannels[DATA_CHANNEL].fnRxCallback = rx_callback_func;
    ANT_FUNC_END();
    return ANT_STATUS_SUCCESS;
 }

 ANTStatus set_ant_state_callback(ANTNativeANTStateCb state_callback_func)
 {
    ANT_FUNC_START();
    g_fnStateCallback = state_callback_func;
    ANT_FUNC_END();
    return ANT_STATUS_SUCCESS;
 }

 ANTStatus ant_tx_message(ANT_U8 ucLen, ANT_U8 *pucMesg)
 {
    ANTStatus uiRet = ANT_STATUS_FAILED;
    int iMutexResult;
    int iResult;
    struct timespec stTimeout;
    int iCondWaitResult;
    ANT_U8 txBuffer[ANT_HCI_MAX_MSG_SIZE];
    ANT_FUNC_START();
    if (ant_radio_enabled_status() != RADIO_STATUS_ENABLED) {
       uiRet = ANT_STATUS_FAILED_BT_NOT_INITIALIZED;
       goto out;
    }
    txBuffer[CHIP_C_HCI_SIZE_OFFSET] = ucLen;
    memcpy(txBuffer + CHIP_C_HCI_HEADER_SIZE, pucMesg, ucLen);
    ANT_SERIAL(txBuffer, ucLen + CHIP_C_HCI_HEADER_SIZE, 'T');
    switch (txBuffer[CHIP_C_HCI_DATA_OFFSET + ANT_MSG_ID_OFFSET]) {
    case MESG_BROADCAST_DATA_ID:
    case MESG_ACKNOWLEDGED_DATA_ID:
    case MESG_BURST_DATA_ID:
    case MESG_EXT_BROADCAST_DATA_ID:
    case MESG_EXT_ACKNOWLEDGED_DATA_ID:
    case MESG_EXT_BURST_DATA_ID:
       ANT_DEBUG_V("getting stFlowControlLock in %s", __FUNCTION__);
       iMutexResult = pthread_mutex_lock(&stFlowControlLock);
       if (iMutexResult) {
          ANT_ERROR("failed to lock flow control mutex during tx: %s", strerror(iMutexResult));
          goto out;
       }
       ANT_DEBUG_V("got stFlowControlLock in %s", __FUNCTION__);

       stRxThreadInfo.astChannels[COMMAND_CHANNEL].ucFlowControlResp = FLOW_STOP;
       iResult = write(stRxThreadInfo.astChannels[DATA_CHANNEL].iFd, txBuffer, ucLen + CHIP_C_HCI_HEADER_SIZE);
       if (iResult < 0) {
          ANT_ERROR("failed to write data message to device: %s", strerror(errno));
       } else if (iResult != ucLen + CHIP_C_HCI_HEADER_SIZE) {
          ANT_ERROR("bytes written and message size dont match up");
       } else {
          stTimeout.tv_sec = time(0) + CHIP_C_FLOW_GO_WAIT_TIMEOUT_SEC;
          stTimeout.tv_nsec = 0;

          while (stRxThreadInfo.astChannels[COMMAND_CHANNEL].ucFlowControlResp != FLOW_GO) {
             iCondWaitResult = pthread_cond_timedwait(&stFlowControlCond, &stFlowControlLock, &stTimeout);
             if (iCondWaitResult) {
                ANT_ERROR("failed to wait for flow control response: %s", strerror(iCondWaitResult));
                if (iCondWaitResult == ETIMEDOUT)
                   uiRet = ANT_STATUS_HARDWARE_ERR;
                goto wait_error;
             }
          }
          uiRet = ANT_STATUS_SUCCESS;
       }
 wait_error:
       ANT_DEBUG_V("releasing stFlowControlLock in %s", __FUNCTION__);
       pthread_mutex_unlock(&stFlowControlLock);
       ANT_DEBUG_V("released stFlowControlLock in %s", __FUNCTION__);
       break;
    default:
       iResult = write(stRxThreadInfo.astChannels[COMMAND_CHANNEL].iFd, txBuffer, ucLen + CHIP_C_HCI_HEADER_SIZE);
       if (iResult < 0) {
          ANT_ERROR("failed to write message to device: %s", strerror(errno));
       }  else if (iResult != ucLen + CHIP_C_HCI_HEADER_SIZE) {
          ANT_ERROR("bytes written and message size dont match up");
       } else {
          uiRet = ANT_STATUS_SUCCESS;
       }
    }
 out:
    ANT_FUNC_END();
    return uiRet;
 }

 ANTStatus ant_radio_hard_reset(void)
 {
    ANTStatus result_status = ANT_STATUS_NOT_SUPPORTED;
    ANT_FUNC_START();
    ANT_FUNC_END();
    return result_status;
 }

 static void ant_disable_channel(ant_channel_info_t *pstChnlInfo)
 {
    ANT_FUNC_START();
    if (!pstChnlInfo) {
       ANT_ERROR("null channel info passed to channel disable function");
       goto out;
    }
    if (pstChnlInfo->iFd != -1) {
       if (close(pstChnlInfo->iFd) < 0) {
          ANT_ERROR("failed to close channel %s(%#x): %s", pstChnlInfo->pcDevicePath, pstChnlInfo->iFd, strerror(errno));
       }
       pstChnlInfo->iFd = -1; //TODO can this overwrite a still valid fd?
    } else {
       ANT_DEBUG_D("%s file is already closed", pstChnlInfo->pcDevicePath);
    }
 out:
    ANT_FUNC_END();
 }

 static int ant_enable_channel(ant_channel_info_t *pstChnlInfo)
 {
    int iRet = -1;
    ANT_FUNC_START();
    if (!pstChnlInfo) {
       ANT_ERROR("null channel info passed to channel enable function");
       errno = EINVAL;
       goto out;
    }
    if (pstChnlInfo->iFd == -1) {
       pstChnlInfo->iFd = open(pstChnlInfo->pcDevicePath, O_RDWR);
       if (pstChnlInfo->iFd < 0) {
          ANT_ERROR("failed to open dev %s: %s", pstChnlInfo->pcDevicePath, strerror(errno));
          goto out;
       }
    } else {
       ANT_DEBUG_D("%s is already enabled", pstChnlInfo->pcDevicePath);
    }
    iRet = 0;
 out:
    ANT_FUNC_END();
    return iRet;
 }

 int ant_do_enable(void)
 {
    int iRet = -1;
    enum ant_channel_type eChannel;
    ANT_FUNC_START();

    stRxThreadInfo.ucRunThread = 1;
    for (eChannel = 0; eChannel < NUM_ANT_CHANNELS; eChannel++) {
       if (ant_enable_channel(&stRxThreadInfo.astChannels[eChannel]) < 0) {
          ANT_ERROR("failed to enable channel %s: %s",
                          stRxThreadInfo.astChannels[eChannel].pcDevicePath,
                          strerror(errno));
          goto out;
       }
    }
    if (stRxThreadInfo.stRxThread == 0) {
       if (pthread_create(&stRxThreadInfo.stRxThread, NULL, fnRxThread, &stRxThreadInfo) < 0) {
          ANT_ERROR("failed to start rx thread: %s", strerror(errno));
          goto out;
       }
    } else {
       ANT_DEBUG_D("rx thread is already running");
    }
    if (!stRxThreadInfo.ucRunThread) {
       ANT_ERROR("rx thread crashed during init");
       goto out;
    }
    iRet = 0;
 out:
    ANT_FUNC_END();
    return iRet;
 }

 void ant_do_disable(void)
 {
    enum ant_channel_type eChannel;
    ANT_FUNC_START();
    stRxThreadInfo.ucRunThread = 0;
    for (eChannel = 0; eChannel < NUM_ANT_CHANNELS; eChannel++)
       ant_disable_channel(&stRxThreadInfo.astChannels[eChannel]);
    if (stRxThreadInfo.stRxThread != 0) {
       if (pthread_join(stRxThreadInfo.stRxThread, NULL) < 0) {
          ANT_ERROR("failed to join rx thread: %s", strerror(errno));
       }
       stRxThreadInfo.stRxThread = 0;
    } else {
       ANT_DEBUG_D("rx thread is not running");
    }
    ANT_FUNC_END();
 }

 ANTStatus ant_enable_radio(void)
 {
    int iLockResult;
    ANTStatus uiRet = ANT_STATUS_FAILED;
    ANT_FUNC_START();
    ANT_DEBUG_V("getting stEnabledStatusLock in %s", __FUNCTION__);
    iLockResult = pthread_mutex_lock(&stEnabledStatusLock);
    if(iLockResult) {
       ANT_ERROR("enable failed to get state lock: %s", strerror(iLockResult));
       goto out;
    }
    ANT_DEBUG_V("got stEnabledStatusLock in %s", __FUNCTION__);

    if (g_fnStateCallback)
       g_fnStateCallback(RADIO_STATUS_ENABLING);

    if (ant_do_enable() < 0) {
       ANT_ERROR("ant enable failed: %s", strerror(errno));

       ant_do_disable();

       if (g_fnStateCallback)
          g_fnStateCallback(ant_radio_enabled_status());
    } else {
       if (g_fnStateCallback)
          g_fnStateCallback(RADIO_STATUS_ENABLED);
       uiRet = ANT_STATUS_SUCCESS;
    }

    ANT_DEBUG_V("releasing stEnabledStatusLock in %s", __FUNCTION__);
    pthread_mutex_unlock(&stEnabledStatusLock);
    ANT_DEBUG_V("released stEnabledStatusLock in %s", __FUNCTION__);
 out:
    ANT_FUNC_END();
    return uiRet;
 }

 ANTStatus ant_disable_radio(void)
 {
    int iLockResult;
    ANTStatus uiRet = ANT_STATUS_FAILED;
    ANT_FUNC_START();
    ANT_DEBUG_V("getting stEnabledStatusLock in %s", __FUNCTION__);
    iLockResult = pthread_mutex_lock(&stEnabledStatusLock);
    if(iLockResult) {
       ANT_ERROR("disable failed to get state lock: %s", strerror(iLockResult));
       goto out;
    }
    ANT_DEBUG_V("got stEnabledStatusLock in %s", __FUNCTION__);

    if (g_fnStateCallback)
       g_fnStateCallback(RADIO_STATUS_DISABLING);

    ant_do_disable();

    if (g_fnStateCallback)
       g_fnStateCallback(ant_radio_enabled_status());
    uiRet = ANT_STATUS_SUCCESS;

    ANT_DEBUG_V("releasing stEnabledStatusLock in %s", __FUNCTION__);
    pthread_mutex_unlock(&stEnabledStatusLock);
    ANT_DEBUG_V("released stEnabledStatusLock in %s", __FUNCTION__);
 out:
    ANT_FUNC_END();
    return uiRet;
 }

 ANTRadioEnabledStatus ant_radio_enabled_status(void)
 {
    enum ant_channel_type eChannel;
    int iOpenFiles = 0;
    int iOpenThread;
    ANTRadioEnabledStatus uiRet = RADIO_STATUS_UNKNOWN;
    ANT_FUNC_START();
    if (stRxThreadInfo.ucChipResetting) {
       uiRet = RADIO_STATUS_RESETTING;
       goto out;
    }
    for (eChannel = 0; eChannel < NUM_ANT_CHANNELS; eChannel++)
       if (stRxThreadInfo.astChannels[eChannel].iFd != -1)
          iOpenFiles++;
    iOpenThread = (stRxThreadInfo.stRxThread) ? 1 : 0;

    if (!stRxThreadInfo.ucRunThread) {
       if (iOpenFiles || iOpenThread) {
          uiRet = RADIO_STATUS_DISABLING;
       } else {
          uiRet = RADIO_STATUS_DISABLED;
       }
    } else {
       if ((iOpenFiles == NUM_ANT_CHANNELS) && iOpenThread) {
          uiRet = RADIO_STATUS_ENABLED;
       } else if (!iOpenFiles && iOpenThread) {
          uiRet = RADIO_STATUS_UNKNOWN;
       } else {
          uiRet = RADIO_STATUS_ENABLING;
       }
    }
 out:
    ANT_DEBUG_D("get radio enabled status returned %d", uiRet);
    ANT_FUNC_END();
    return uiRet;
 }

 const char *ant_get_lib_version()
 {
    return "libantradio.so: CHIP_C TTY Transport. Version "
       LIBANT_STACK_MAJOR"."LIBANT_STACK_MINOR"."LIBANT_STACK_INCRE;
 }
	/*
	* ANT Stack
	*
	* Copyright 2011 Dynastream Innovations
	*
	* 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.
	*/
	/*******************************************************************************\
	*
	* FILE NAME: ant_native_chardev.c
	*
	* BRIEF:
	* This file provides the character device implementation of ant_native.h
	*
	*
	\*******************************************************************************/

	#include <errno.h>
	#include <fcntl.h> /* for open() */
	#include <linux/ioctl.h>
	#include <pthread.h>

	#include "ant_native.h"
	#include "ant_types.h"
	#include "ant_log.h"
	#include "ant_version.h"

	#include "ant_native_chardev.h"
	#include "ant_rx_chardev.h"

	#define MESG_BROADCAST_DATA_ID ((ANT_U8)0x4E)
	#define MESG_ACKNOWLEDGED_DATA_ID ((ANT_U8)0x4F)
	#define MESG_BURST_DATA_ID ((ANT_U8)0x50)
	#define MESG_EXT_BROADCAST_DATA_ID ((ANT_U8)0x5D)
	#define MESG_EXT_ACKNOWLEDGED_DATA_ID ((ANT_U8)0x5E)
	#define MESG_EXT_BURST_DATA_ID ((ANT_U8)0x5F)

	static ant_rx_thread_info_t stRxThreadInfo;
	static pthread_mutex_t stEnabledStatusLock = PTHREAD_MUTEX_INITIALIZER;
	static pthread_mutex_t stFlowControlLock = PTHREAD_MUTEX_INITIALIZER;
	static pthread_cond_t stFlowControlCond = PTHREAD_COND_INITIALIZER;
	ANTNativeANTStateCb g_fnStateCallback;

	static void ant_channel_init(ant_channel_info_t pstChnlInfo, const char pcCharDevName)
	{
	pstChnlInfo->pcDevicePath = pcCharDevName;
	pstChnlInfo->iFd = -1;
	pstChnlInfo->fnRxCallback = NULL;
	pstChnlInfo->ucFlowControlResp = FLOW_GO;
	pstChnlInfo->pstFlowControlCond = &stFlowControlCond;
	pstChnlInfo->pstFlowControlLock = &stFlowControlLock;
	}

	ANTStatus ant_init(void)
	{
	ANTStatus uiRet = ANT_STATUS_FAILED;
	ANT_FUNC_START();
	stRxThreadInfo.stRxThread = 0;
	stRxThreadInfo.ucRunThread = 0;
	stRxThreadInfo.ucChipResetting = 0;
	stRxThreadInfo.pstEnabledStatusLock = &stEnabledStatusLock;
	g_fnStateCallback = 0;
	ant_channel_init(&stRxThreadInfo.astChannels[COMMAND_CHANNEL], ANT_COMMANDS_DEVICE_NAME);
	ant_channel_init(&stRxThreadInfo.astChannels[DATA_CHANNEL], ANT_DATA_DEVICE_NAME);
	uiRet = ANT_STATUS_SUCCESS;
	ANT_FUNC_END();
	return uiRet;
	}

	ANTStatus ant_deinit(void)
	{
	ANTStatus uiRet = ANT_STATUS_FAILED;
	ANT_FUNC_START();
	uiRet = ANT_STATUS_SUCCESS;
	ANT_FUNC_END();
	return uiRet;
	}

	ANTStatus set_ant_rx_callback(ANTNativeANTEventCb rx_callback_func)
	{
	ANT_FUNC_START();
	stRxThreadInfo.astChannels[COMMAND_CHANNEL].fnRxCallback = rx_callback_func;
	stRxThreadInfo.astChannels[DATA_CHANNEL].fnRxCallback = rx_callback_func;
	ANT_FUNC_END();
	return ANT_STATUS_SUCCESS;
	}

	ANTStatus set_ant_state_callback(ANTNativeANTStateCb state_callback_func)
	{
	ANT_FUNC_START();
	g_fnStateCallback = state_callback_func;
	ANT_FUNC_END();
	return ANT_STATUS_SUCCESS;
	}

	ANTStatus ant_tx_message(ANT_U8 ucLen, ANT_U8 *pucMesg)
	{
	ANTStatus uiRet = ANT_STATUS_FAILED;
	int iMutexResult;
	int iResult;
	struct timespec stTimeout;
	int iCondWaitResult;
	ANT_U8 txBuffer[ANT_HCI_MAX_MSG_SIZE];
	ANT_FUNC_START();
	if (ant_radio_enabled_status() != RADIO_STATUS_ENABLED) {
	uiRet = ANT_STATUS_FAILED_BT_NOT_INITIALIZED;
	goto out;
	}
	txBuffer[CHIP_C_HCI_SIZE_OFFSET] = ucLen;
	memcpy(txBuffer + CHIP_C_HCI_HEADER_SIZE, pucMesg, ucLen);
	ANT_SERIAL(txBuffer, ucLen + CHIP_C_HCI_HEADER_SIZE, 'T');
	switch (txBuffer[CHIP_C_HCI_DATA_OFFSET + ANT_MSG_ID_OFFSET]) {
	case MESG_BROADCAST_DATA_ID:
	case MESG_ACKNOWLEDGED_DATA_ID:
	case MESG_BURST_DATA_ID:
	case MESG_EXT_BROADCAST_DATA_ID:
	case MESG_EXT_ACKNOWLEDGED_DATA_ID:
	case MESG_EXT_BURST_DATA_ID:
	ANT_DEBUG_V("getting stFlowControlLock in %s", __FUNCTION__);
	iMutexResult = pthread_mutex_lock(&stFlowControlLock);
	if (iMutexResult) {
	ANT_ERROR("failed to lock flow control mutex during tx: %s", strerror(iMutexResult));
	goto out;
	}
	ANT_DEBUG_V("got stFlowControlLock in %s", __FUNCTION__);

	stRxThreadInfo.astChannels[COMMAND_CHANNEL].ucFlowControlResp = FLOW_STOP;
	iResult = write(stRxThreadInfo.astChannels[DATA_CHANNEL].iFd, txBuffer, ucLen + CHIP_C_HCI_HEADER_SIZE);
	if (iResult < 0) {
	ANT_ERROR("failed to write data message to device: %s", strerror(errno));
	} else if (iResult != ucLen + CHIP_C_HCI_HEADER_SIZE) {
	ANT_ERROR("bytes written and message size dont match up");
	} else {
	stTimeout.tv_sec = time(0) + CHIP_C_FLOW_GO_WAIT_TIMEOUT_SEC;
	stTimeout.tv_nsec = 0;

	while (stRxThreadInfo.astChannels[COMMAND_CHANNEL].ucFlowControlResp != FLOW_GO) {
	iCondWaitResult = pthread_cond_timedwait(&stFlowControlCond, &stFlowControlLock, &stTimeout);
	if (iCondWaitResult) {
	ANT_ERROR("failed to wait for flow control response: %s", strerror(iCondWaitResult));
	if (iCondWaitResult == ETIMEDOUT)
	uiRet = ANT_STATUS_HARDWARE_ERR;
	goto wait_error;
	}
	}
	uiRet = ANT_STATUS_SUCCESS;
	}
	wait_error:
	ANT_DEBUG_V("releasing stFlowControlLock in %s", __FUNCTION__);
	pthread_mutex_unlock(&stFlowControlLock);
	ANT_DEBUG_V("released stFlowControlLock in %s", __FUNCTION__);
	break;
	default:
	iResult = write(stRxThreadInfo.astChannels[COMMAND_CHANNEL].iFd, txBuffer, ucLen + CHIP_C_HCI_HEADER_SIZE);
	if (iResult < 0) {
	ANT_ERROR("failed to write message to device: %s", strerror(errno));
	} else if (iResult != ucLen + CHIP_C_HCI_HEADER_SIZE) {
	ANT_ERROR("bytes written and message size dont match up");
	} else {
	uiRet = ANT_STATUS_SUCCESS;
	}
	}
	out:
	ANT_FUNC_END();
	return uiRet;
	}

	ANTStatus ant_radio_hard_reset(void)
	{
	ANTStatus result_status = ANT_STATUS_NOT_SUPPORTED;
	ANT_FUNC_START();
	ANT_FUNC_END();
	return result_status;
	}

	static void ant_disable_channel(ant_channel_info_t *pstChnlInfo)
	{
	ANT_FUNC_START();
	if (!pstChnlInfo) {
	ANT_ERROR("null channel info passed to channel disable function");
	goto out;
	}
	if (pstChnlInfo->iFd != -1) {
	if (close(pstChnlInfo->iFd) < 0) {
	ANT_ERROR("failed to close channel %s(%#x): %s", pstChnlInfo->pcDevicePath, pstChnlInfo->iFd, strerror(errno));
	}
	pstChnlInfo->iFd = -1; //TODO can this overwrite a still valid fd?
	} else {
	ANT_DEBUG_D("%s file is already closed", pstChnlInfo->pcDevicePath);
	}
	out:
	ANT_FUNC_END();
	}

	static int ant_enable_channel(ant_channel_info_t *pstChnlInfo)
	{
	int iRet = -1;
	ANT_FUNC_START();
	if (!pstChnlInfo) {
	ANT_ERROR("null channel info passed to channel enable function");
	errno = EINVAL;
	goto out;
	}
	if (pstChnlInfo->iFd == -1) {
	pstChnlInfo->iFd = open(pstChnlInfo->pcDevicePath, O_RDWR);
	if (pstChnlInfo->iFd < 0) {
	ANT_ERROR("failed to open dev %s: %s", pstChnlInfo->pcDevicePath, strerror(errno));
	goto out;
	}
	} else {
	ANT_DEBUG_D("%s is already enabled", pstChnlInfo->pcDevicePath);
	}
	iRet = 0;
	out:
	ANT_FUNC_END();
	return iRet;
	}

	int ant_do_enable(void)
	{
	int iRet = -1;
	enum ant_channel_type eChannel;
	ANT_FUNC_START();

	stRxThreadInfo.ucRunThread = 1;
	for (eChannel = 0; eChannel < NUM_ANT_CHANNELS; eChannel++) {
	if (ant_enable_channel(&stRxThreadInfo.astChannels[eChannel]) < 0) {
	ANT_ERROR("failed to enable channel %s: %s",
	stRxThreadInfo.astChannels[eChannel].pcDevicePath,
	strerror(errno));
	goto out;
	}
	}
	if (stRxThreadInfo.stRxThread == 0) {
	if (pthread_create(&stRxThreadInfo.stRxThread, NULL, fnRxThread, &stRxThreadInfo) < 0) {
	ANT_ERROR("failed to start rx thread: %s", strerror(errno));
	goto out;
	}
	} else {
	ANT_DEBUG_D("rx thread is already running");
	}
	if (!stRxThreadInfo.ucRunThread) {
	ANT_ERROR("rx thread crashed during init");
	goto out;
	}
	iRet = 0;
	out:
	ANT_FUNC_END();
	return iRet;
	}

	void ant_do_disable(void)
	{
	enum ant_channel_type eChannel;
	ANT_FUNC_START();
	stRxThreadInfo.ucRunThread = 0;
	for (eChannel = 0; eChannel < NUM_ANT_CHANNELS; eChannel++)
	ant_disable_channel(&stRxThreadInfo.astChannels[eChannel]);
	if (stRxThreadInfo.stRxThread != 0) {
	if (pthread_join(stRxThreadInfo.stRxThread, NULL) < 0) {
	ANT_ERROR("failed to join rx thread: %s", strerror(errno));
	}
	stRxThreadInfo.stRxThread = 0;
	} else {
	ANT_DEBUG_D("rx thread is not running");
	}
	ANT_FUNC_END();
	}

	ANTStatus ant_enable_radio(void)
	{
	int iLockResult;
	ANTStatus uiRet = ANT_STATUS_FAILED;
	ANT_FUNC_START();
	ANT_DEBUG_V("getting stEnabledStatusLock in %s", __FUNCTION__);
	iLockResult = pthread_mutex_lock(&stEnabledStatusLock);
	if(iLockResult) {
	ANT_ERROR("enable failed to get state lock: %s", strerror(iLockResult));
	goto out;
	}
	ANT_DEBUG_V("got stEnabledStatusLock in %s", __FUNCTION__);

	if (g_fnStateCallback)
	g_fnStateCallback(RADIO_STATUS_ENABLING);

	if (ant_do_enable() < 0) {
	ANT_ERROR("ant enable failed: %s", strerror(errno));

	ant_do_disable();

	if (g_fnStateCallback)
	g_fnStateCallback(ant_radio_enabled_status());
	} else {
	if (g_fnStateCallback)
	g_fnStateCallback(RADIO_STATUS_ENABLED);
	uiRet = ANT_STATUS_SUCCESS;
	}

	ANT_DEBUG_V("releasing stEnabledStatusLock in %s", __FUNCTION__);
	pthread_mutex_unlock(&stEnabledStatusLock);
	ANT_DEBUG_V("released stEnabledStatusLock in %s", __FUNCTION__);
	out:
	ANT_FUNC_END();
	return uiRet;
	}

	ANTStatus ant_disable_radio(void)
	{
	int iLockResult;
	ANTStatus uiRet = ANT_STATUS_FAILED;
	ANT_FUNC_START();
	ANT_DEBUG_V("getting stEnabledStatusLock in %s", __FUNCTION__);
	iLockResult = pthread_mutex_lock(&stEnabledStatusLock);
	if(iLockResult) {
	ANT_ERROR("disable failed to get state lock: %s", strerror(iLockResult));
	goto out;
	}
	ANT_DEBUG_V("got stEnabledStatusLock in %s", __FUNCTION__);

	if (g_fnStateCallback)
	g_fnStateCallback(RADIO_STATUS_DISABLING);

	ant_do_disable();

	if (g_fnStateCallback)
	g_fnStateCallback(ant_radio_enabled_status());
	uiRet = ANT_STATUS_SUCCESS;

	ANT_DEBUG_V("releasing stEnabledStatusLock in %s", __FUNCTION__);
	pthread_mutex_unlock(&stEnabledStatusLock);
	ANT_DEBUG_V("released stEnabledStatusLock in %s", __FUNCTION__);
	out:
	ANT_FUNC_END();
	return uiRet;
	}

	ANTRadioEnabledStatus ant_radio_enabled_status(void)
	{
	enum ant_channel_type eChannel;
	int iOpenFiles = 0;
	int iOpenThread;
	ANTRadioEnabledStatus uiRet = RADIO_STATUS_UNKNOWN;
	ANT_FUNC_START();
	if (stRxThreadInfo.ucChipResetting) {
	uiRet = RADIO_STATUS_RESETTING;
	goto out;
	}
	for (eChannel = 0; eChannel < NUM_ANT_CHANNELS; eChannel++)
	if (stRxThreadInfo.astChannels[eChannel].iFd != -1)
	iOpenFiles++;
	iOpenThread = (stRxThreadInfo.stRxThread) ? 1 : 0;

	if (!stRxThreadInfo.ucRunThread) {
	if (iOpenFiles \|\| iOpenThread) {
	uiRet = RADIO_STATUS_DISABLING;
	} else {
	uiRet = RADIO_STATUS_DISABLED;
	}
	} else {
	if ((iOpenFiles == NUM_ANT_CHANNELS) && iOpenThread) {
	uiRet = RADIO_STATUS_ENABLED;
	} else if (!iOpenFiles && iOpenThread) {
	uiRet = RADIO_STATUS_UNKNOWN;
	} else {
	uiRet = RADIO_STATUS_ENABLING;
	}
	}
	out:
	ANT_DEBUG_D("get radio enabled status returned %d", uiRet);
	ANT_FUNC_END();
	return uiRet;
	}

	const char *ant_get_lib_version()
	{
	return "libantradio.so: CHIP_C TTY Transport. Version "
	LIBANT_STACK_MAJOR"."LIBANT_STACK_MINOR"."LIBANT_STACK_INCRE;
	}