/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
/*
 * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
 */

#ifndef _LINUX_LOGGER_H
#define _LINUX_LOGGER_H

#include <linux/types.h>
#include <linux/ioctl.h>

/**
 * struct user_logger_entry_compat - defines a single entry that is given
 * to a logger
 * @len:	The length of the payload
 * @__pad:	Two bytes of padding that appear to be required
 * @pid:	The generating process' process ID
 * @tid:	The generating process' thread ID
 * @sec:	The number of seconds that have elapsed since the Epoch
 * @nsec:	The number of nanoseconds that have elapsed since @sec
 * @msg:	The message that is to be logged
 *
 * The userspace structure for version 1 of the logger_entry ABI.
 * This structure is returned to userspace unless the caller requests
 * an upgrade to a newer ABI version.
 */
struct user_logger_entry_compat {
	__u16		len;
	__u16		__pad;
	__s32		pid;
	__s32		tid;
	__s32		sec;
	__s32		nsec;
	char		msg[0];
};

/**
 * struct logger_entry - defines a single entry that is given to a logger
 * @len:	The length of the payload
 * @hdr_size:	sizeof(struct logger_entry_v2)
 * @pid:	The generating process' process ID
 * @tid:	The generating process' thread ID
 * @sec:	The number of seconds that have elapsed since the Epoch
 * @nsec:	The number of nanoseconds that have elapsed since @sec
 * @euid:	Effective UID of logger
 * @msg:	The message that is to be logged
 *
 * The structure for version 2 of the logger_entry ABI.
 * This structure is returned to userspace if ioctl(LOGGER_SET_VERSION)
 * is called with version >= 2
 */
struct logger_entry {
	__u16		len;
	__u16		hdr_size;
	__s32		pid;
	__s32		tid;
	__s32		sec;
	__s32		nsec;
	kuid_t		euid;
	char		msg[0];
};

#define LOGGER_LOG_RADIO	"log_radio"	/* radio-related messages */
#define LOGGER_LOG_EVENTS	"log_events"	/* system/hardware events */
#define LOGGER_LOG_SYSTEM	"log_system"	/* system/framework messages */
#define LOGGER_LOG_MAIN		"log_main"	/* everything else */

#define LOGGER_ENTRY_MAX_PAYLOAD	4076

#define __LOGGERIO	0xAE

#define LOGGER_GET_LOG_BUF_SIZE		_IO(__LOGGERIO, 1) /* size of log */
#define LOGGER_GET_LOG_LEN		_IO(__LOGGERIO, 2) /* used log len */
#define LOGGER_GET_NEXT_ENTRY_LEN	_IO(__LOGGERIO, 3) /* next entry len */
#define LOGGER_FLUSH_LOG		_IO(__LOGGERIO, 4) /* flush log */
#define LOGGER_GET_VERSION		_IO(__LOGGERIO, 5) /* abi version */
#define LOGGER_SET_VERSION		_IO(__LOGGERIO, 6) /* abi version */

#endif /* _LINUX_LOGGER_H */
