✏ EDIT: stm.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * System Trace Module (STM) userspace interfaces
 * Copyright (c) 2014, Intel Corporation.
 *
 * STM class implements generic infrastructure for  System Trace Module devices
 * as defined in MIPI STPv2 specification.
 */

#ifndef _LINUX_STM_H
#define _LINUX_STM_H

#include <linux/types.h>

/* Maximum allowed master and channel values */
#define STP_MASTER_MAX	0xffff
#define STP_CHANNEL_MAX	0xffff

/**
 * struct stp_policy_id - identification for the STP policy
 * @size:	size of the structure including real id[] length
 * @master:	assigned master
 * @channel:	first assigned channel
 * @width:	number of requested channels
 * @id:		identification string
 *
 * User must calculate the total size of the structure and put it into
 * @size field, fill out the @id and desired @width. In return, kernel
 * fills out @master, @channel and @width.
 */
struct stp_policy_id {
	__u32		size;
	__u16		master;
	__u16		channel;
	__u16		width;
	/* padding */
	__u16		__reserved_0;
	__u32		__reserved_1;
	char		id[0];
};

#define STP_POLICY_ID_SET	_IOWR('%', 0, struct stp_policy_id)
#define STP_POLICY_ID_GET	_IOR('%', 1, struct stp_policy_id)
#define STP_SET_OPTIONS		_IOW('%', 2, __u64)

#endif /* _LINUX_STM_H */

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