/*
	$License:
	Copyright (C) 2011 InvenSense Corporation, All Rights Reserved.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
	$
 */

/*
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright (C) 2005 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.
 */

/*
 * C/C++ logging functions.  See the logging documentation for API details.
 *
 * We'd like these to be available from C code (in case we import some from
 * somewhere), so this has a C interface.
 *
 * The output will be correct when the log file is shared between multiple
 * threads and/or multiple processes so long as the operating system
 * supports O_APPEND.  These calls have mutex-protected data structures
 * and so are NOT reentrant.  Do not use MPL_LOG in a signal handler.
 */
#ifndef _LIBS_CUTILS_MPL_LOG_H
#define _LIBS_CUTILS_MPL_LOG_H

#include "mltypes.h"
#include <stdarg.h>


#include <linux/kernel.h>


/* --------------------------------------------------------------------- */

/*
 * Normally we strip MPL_LOGV (VERBOSE messages) from release builds.
 * You can modify this (for example with "#define MPL_LOG_NDEBUG 0"
 * at the top of your source file) to change that behavior.
 */
#ifndef MPL_LOG_NDEBUG
#ifdef NDEBUG
#define MPL_LOG_NDEBUG 1
#else
#define MPL_LOG_NDEBUG 0
#endif
#endif

#define MPL_LOG_UNKNOWN MPL_LOG_VERBOSE
#define MPL_LOG_DEFAULT KERN_DEFAULT
#define MPL_LOG_VERBOSE KERN_CONT
#define MPL_LOG_DEBUG   KERN_NOTICE
#define MPL_LOG_INFO    KERN_INFO
#define MPL_LOG_WARN    KERN_WARNING
#define MPL_LOG_ERROR   KERN_ERR
#define MPL_LOG_SILENT  MPL_LOG_VERBOSE



/*
 * This is the local tag used for the following simplified
 * logging macros.  You can change this preprocessor definition
 * before using the other macros to change the tag.
 */
#ifndef MPL_LOG_TAG
#define MPL_LOG_TAG
#endif

/* --------------------------------------------------------------------- */

/*
 * Simplified macro to send a verbose log message using the current MPL_LOG_TAG.
 */
#ifndef MPL_LOGV
#if MPL_LOG_NDEBUG
#define MPL_LOGV(fmt, ...)						\
	do {								\
		if (0)							\
			MPL_LOG(LOG_VERBOSE, MPL_LOG_TAG, fmt, ##__VA_ARGS__);\
	} while (0)
#else
#define MPL_LOGV(fmt, ...) MPL_LOG(LOG_VERBOSE, MPL_LOG_TAG, fmt, ##__VA_ARGS__)
#endif
#endif

#ifndef CONDITION
#define CONDITION(cond)     ((cond) != 0)
#endif

#ifndef MPL_LOGV_IF
#if MPL_LOG_NDEBUG
#define MPL_LOGV_IF(cond, fmt, ...)  \
	do { if (0) MPL_LOG(fmt, ##__VA_ARGS__); } while (0)
#else
#define MPL_LOGV_IF(cond, fmt, ...) \
	((CONDITION(cond))						\
		? MPL_LOG(LOG_VERBOSE, MPL_LOG_TAG, fmt, ##__VA_ARGS__) \
		: (void)0)
#endif
#endif

/*
 * Simplified macro to send a debug log message using the current MPL_LOG_TAG.
 */
#ifndef MPL_LOGD
#define MPL_LOGD(fmt, ...) MPL_LOG(LOG_DEBUG, MPL_LOG_TAG, fmt, ##__VA_ARGS__)
#endif

#ifndef MPL_LOGD_IF
#define MPL_LOGD_IF(cond, fmt, ...) \
	((CONDITION(cond))					       \
		? MPL_LOG(LOG_DEBUG, MPL_LOG_TAG, fmt, ##__VA_ARGS__)  \
		: (void)0)
#endif

/*
 * Simplified macro to send an info log message using the current MPL_LOG_TAG.
 */
#ifndef MPL_LOGI
#define MPL_LOGI(fmt, ...) pr_info(KERN_INFO MPL_LOG_TAG fmt, ##__VA_ARGS__)
#endif

#ifndef MPL_LOGI_IF
#define MPL_LOGI_IF(cond, fmt, ...) \
	((CONDITION(cond))                                              \
		? MPL_LOG(LOG_INFO, MPL_LOG_TAG, fmt, ##__VA_ARGS__)   \
		: (void)0)
#endif

/*
 * Simplified macro to send a warning log message using the current MPL_LOG_TAG.
 */
#ifndef MPL_LOGW
#define MPL_LOGW(fmt, ...) printk(KERN_WARNING MPL_LOG_TAG fmt, ##__VA_ARGS__)
#endif

#ifndef MPL_LOGW_IF
#define MPL_LOGW_IF(cond, fmt, ...) \
	((CONDITION(cond))					       \
		? MPL_LOG(LOG_WARN, MPL_LOG_TAG, fmt, ##__VA_ARGS__)   \
		: (void)0)
#endif

/*
 * Simplified macro to send an error log message using the current MPL_LOG_TAG.
 */
#ifndef MPL_LOGE
#define MPL_LOGE(fmt, ...) printk(KERN_ERR MPL_LOG_TAG fmt, ##__VA_ARGS__)
#endif

#ifndef MPL_LOGE_IF
#define MPL_LOGE_IF(cond, fmt, ...) \
	((CONDITION(cond))					       \
		? MPL_LOG(LOG_ERROR, MPL_LOG_TAG, fmt, ##__VA_ARGS__)  \
		: (void)0)
#endif

/* --------------------------------------------------------------------- */

/*
 * Log a fatal error.  If the given condition fails, this stops program
 * execution like a normal assertion, but also generating the given message.
 * It is NOT stripped from release builds.  Note that the condition test
 * is -inverted- from the normal assert() semantics.
 */
#define MPL_LOG_ALWAYS_FATAL_IF(cond, fmt, ...) \
	((CONDITION(cond))					   \
		? ((void)android_printAssert(#cond, MPL_LOG_TAG,   \
						fmt, ##__VA_ARGS__))	\
		: (void)0)

#define MPL_LOG_ALWAYS_FATAL(fmt, ...) \
	(((void)android_printAssert(NULL, MPL_LOG_TAG, fmt, ##__VA_ARGS__)))

/*
 * Versions of MPL_LOG_ALWAYS_FATAL_IF and MPL_LOG_ALWAYS_FATAL that
 * are stripped out of release builds.
 */
#if MPL_LOG_NDEBUG
#define MPL_LOG_FATAL_IF(cond, fmt, ...)				\
	do {								\
		if (0)							\
			MPL_LOG_ALWAYS_FATAL_IF(cond, fmt, ##__VA_ARGS__); \
	} while (0)
#define MPL_LOG_FATAL(fmt, ...)						\
	do {								\
		if (0)							\
			MPL_LOG_ALWAYS_FATAL(fmt, ##__VA_ARGS__)	\
	} while (0)
#else
#define MPL_LOG_FATAL_IF(cond, fmt, ...) \
	MPL_LOG_ALWAYS_FATAL_IF(cond, fmt, ##__VA_ARGS__)
#define MPL_LOG_FATAL(fmt, ...) \
	MPL_LOG_ALWAYS_FATAL(fmt, ##__VA_ARGS__)
#endif

/*
 * Assertion that generates a log message when the assertion fails.
 * Stripped out of release builds.  Uses the current MPL_LOG_TAG.
 */
#define MPL_LOG_ASSERT(cond, fmt, ...)			\
	MPL_LOG_FATAL_IF(!(cond), fmt, ##__VA_ARGS__)

/* --------------------------------------------------------------------- */

/*
 * Basic log message macro.
 *
 * Example:
 *  MPL_LOG(MPL_LOG_WARN, NULL, "Failed with error %d", errno);
 *
 * The second argument may be NULL or "" to indicate the "global" tag.
 */
#ifndef MPL_LOG
#define MPL_LOG(priority, tag, fmt, ...)		\
	MPL_LOG_PRI(priority, tag, fmt, ##__VA_ARGS__)
#endif

/*
 * Log macro that allows you to specify a number for the priority.
 */
#ifndef MPL_LOG_PRI
#define MPL_LOG_PRI(priority, tag, fmt, ...) \
	pr_debug(MPL_##priority tag fmt, ##__VA_ARGS__)
#endif

/*
 * Log macro that allows you to pass in a varargs ("args" is a va_list).
 */
#ifndef MPL_LOG_PRI_VA
/* not allowed in the Kernel because there is no dev_dbg that takes a va_list */
#endif

/* --------------------------------------------------------------------- */

/*
 * ===========================================================================
 *
 * The stuff in the rest of this file should not be used directly.
 */

int _MLPrintLog(int priority, const char *tag, const char *fmt,	...);
int _MLPrintVaLog(int priority, const char *tag, const char *fmt, va_list args);
/* Final implementation of actual writing to a character device */
int _MLWriteLog(const char *buf, int buflen);

static inline void __print_result_location(int result,
					   const char *file,
					   const char *func, int line)
{
	MPL_LOGE("%s|%s|%d returning %d\n", file, func, line, result);
}

#define LOG_RESULT_LOCATION(condition) \
	do {								\
		__print_result_location((int)(condition), __FILE__,	\
					__func__, __LINE__);		\
	} while (0)


#endif				/* _LIBS_CUTILS_MPL_LOG_H */