1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  * System Trace Module (STM) userspace interfaces
4  * Copyright (c) 2014, Intel Corporation.
5  *
6  * STM class implements generic infrastructure for  System Trace Module devices
7  * as defined in MIPI STPv2 specification.
8  */
9 
10 #ifndef _UAPI_LINUX_STM_H
11 #define _UAPI_LINUX_STM_H
12 
13 #include <linux/types.h>
14 
15 /* Maximum allowed master and channel values */
16 #define STP_MASTER_MAX	0xffff
17 #define STP_CHANNEL_MAX	0xffff
18 
19 /**
20  * struct stp_policy_id - identification for the STP policy
21  * @size:	size of the structure including real id[] length
22  * @master:	assigned master
23  * @channel:	first assigned channel
24  * @width:	number of requested channels
25  * @id:		identification string
26  *
27  * User must calculate the total size of the structure and put it into
28  * @size field, fill out the @id and desired @width. In return, kernel
29  * fills out @master, @channel and @width.
30  */
31 struct stp_policy_id {
32 	__u32		size;
33 	__u16		master;
34 	__u16		channel;
35 	__u16		width;
36 	/* padding */
37 	__u16		__reserved_0;
38 	__u32		__reserved_1;
39 	char		id[];
40 };
41 
42 #define STP_POLICY_ID_SET	_IOWR('%', 0, struct stp_policy_id)
43 #define STP_POLICY_ID_GET	_IOR('%', 1, struct stp_policy_id)
44 #define STP_SET_OPTIONS		_IOW('%', 2, __u64)
45 
46 #endif /* _UAPI_LINUX_STM_H */
47