1 /* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
2 /*
3  * linux/can/netlink.h
4  *
5  * Definitions for the CAN netlink interface
6  *
7  * Copyright (c) 2009 Wolfgang Grandegger <wg@grandegger.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the version 2 of the GNU General Public License
11  * as published by the Free Software Foundation
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  */
18 
19 #ifndef _UAPI_CAN_NETLINK_H
20 #define _UAPI_CAN_NETLINK_H
21 
22 #include <linux/types.h>
23 
24 /*
25  * CAN bit-timing parameters
26  *
27  * For further information, please read chapter "8 BIT TIMING
28  * REQUIREMENTS" of the "Bosch CAN Specification version 2.0"
29  * at http://www.semiconductors.bosch.de/pdf/can2spec.pdf.
30  */
31 struct can_bittiming {
32 	__u32 bitrate;		/* Bit-rate in bits/second */
33 	__u32 sample_point;	/* Sample point in one-tenth of a percent */
34 	__u32 tq;		/* Time quanta (TQ) in nanoseconds */
35 	__u32 prop_seg;		/* Propagation segment in TQs */
36 	__u32 phase_seg1;	/* Phase buffer segment 1 in TQs */
37 	__u32 phase_seg2;	/* Phase buffer segment 2 in TQs */
38 	__u32 sjw;		/* Synchronisation jump width in TQs */
39 	__u32 brp;		/* Bit-rate prescaler */
40 };
41 
42 /*
43  * CAN hardware-dependent bit-timing constant
44  *
45  * Used for calculating and checking bit-timing parameters
46  */
47 struct can_bittiming_const {
48 	char name[16];		/* Name of the CAN controller hardware */
49 	__u32 tseg1_min;	/* Time segment 1 = prop_seg + phase_seg1 */
50 	__u32 tseg1_max;
51 	__u32 tseg2_min;	/* Time segment 2 = phase_seg2 */
52 	__u32 tseg2_max;
53 	__u32 sjw_max;		/* Synchronisation jump width */
54 	__u32 brp_min;		/* Bit-rate prescaler */
55 	__u32 brp_max;
56 	__u32 brp_inc;
57 };
58 
59 /*
60  * CAN clock parameters
61  */
62 struct can_clock {
63 	__u32 freq;		/* CAN system clock frequency in Hz */
64 };
65 
66 /*
67  * CAN operational and error states
68  */
69 enum can_state {
70 	CAN_STATE_ERROR_ACTIVE = 0,	/* RX/TX error count < 96 */
71 	CAN_STATE_ERROR_WARNING,	/* RX/TX error count < 128 */
72 	CAN_STATE_ERROR_PASSIVE,	/* RX/TX error count < 256 */
73 	CAN_STATE_BUS_OFF,		/* RX/TX error count >= 256 */
74 	CAN_STATE_STOPPED,		/* Device is stopped */
75 	CAN_STATE_SLEEPING,		/* Device is sleeping */
76 	CAN_STATE_MAX
77 };
78 
79 /*
80  * CAN bus error counters
81  */
82 struct can_berr_counter {
83 	__u16 txerr;
84 	__u16 rxerr;
85 };
86 
87 /*
88  * CAN controller mode
89  */
90 struct can_ctrlmode {
91 	__u32 mask;
92 	__u32 flags;
93 };
94 
95 #define CAN_CTRLMODE_LOOPBACK		0x01	/* Loopback mode */
96 #define CAN_CTRLMODE_LISTENONLY		0x02	/* Listen-only mode */
97 #define CAN_CTRLMODE_3_SAMPLES		0x04	/* Triple sampling mode */
98 #define CAN_CTRLMODE_ONE_SHOT		0x08	/* One-Shot mode */
99 #define CAN_CTRLMODE_BERR_REPORTING	0x10	/* Bus-error reporting */
100 #define CAN_CTRLMODE_FD			0x20	/* CAN FD mode */
101 #define CAN_CTRLMODE_PRESUME_ACK	0x40	/* Ignore missing CAN ACKs */
102 #define CAN_CTRLMODE_FD_NON_ISO		0x80	/* CAN FD in non-ISO mode */
103 #define CAN_CTRLMODE_CC_LEN8_DLC	0x100	/* Classic CAN DLC option */
104 
105 /*
106  * CAN device statistics
107  */
108 struct can_device_stats {
109 	__u32 bus_error;	/* Bus errors */
110 	__u32 error_warning;	/* Changes to error warning state */
111 	__u32 error_passive;	/* Changes to error passive state */
112 	__u32 bus_off;		/* Changes to bus off state */
113 	__u32 arbitration_lost; /* Arbitration lost errors */
114 	__u32 restarts;		/* CAN controller re-starts */
115 };
116 
117 /*
118  * CAN netlink interface
119  */
120 enum {
121 	IFLA_CAN_UNSPEC,
122 	IFLA_CAN_BITTIMING,
123 	IFLA_CAN_BITTIMING_CONST,
124 	IFLA_CAN_CLOCK,
125 	IFLA_CAN_STATE,
126 	IFLA_CAN_CTRLMODE,
127 	IFLA_CAN_RESTART_MS,
128 	IFLA_CAN_RESTART,
129 	IFLA_CAN_BERR_COUNTER,
130 	IFLA_CAN_DATA_BITTIMING,
131 	IFLA_CAN_DATA_BITTIMING_CONST,
132 	IFLA_CAN_TERMINATION,
133 	IFLA_CAN_TERMINATION_CONST,
134 	IFLA_CAN_BITRATE_CONST,
135 	IFLA_CAN_DATA_BITRATE_CONST,
136 	IFLA_CAN_BITRATE_MAX,
137 	__IFLA_CAN_MAX
138 };
139 
140 #define IFLA_CAN_MAX	(__IFLA_CAN_MAX - 1)
141 
142 /* u16 termination range: 1..65535 Ohms */
143 #define CAN_TERMINATION_DISABLED 0
144 
145 #endif /* !_UAPI_CAN_NETLINK_H */
146