1 /* SPDX-License-Identifier: GPL-2.0 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 _CAN_NETLINK_H 20 #define _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 harware-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 segement 1 = prop_seg + phase_seg1 */ 50 __u32 tseg1_max; 51 __u32 tseg2_min; /* Time segement 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 */ 103 104 /* 105 * CAN device statistics 106 */ 107 struct can_device_stats { 108 __u32 bus_error; /* Bus errors */ 109 __u32 error_warning; /* Changes to error warning state */ 110 __u32 error_passive; /* Changes to error passive state */ 111 __u32 bus_off; /* Changes to bus off state */ 112 __u32 arbitration_lost; /* Arbitration lost errors */ 113 __u32 restarts; /* CAN controller re-starts */ 114 }; 115 116 /* 117 * CAN netlink interface 118 */ 119 enum { 120 IFLA_CAN_UNSPEC, 121 IFLA_CAN_BITTIMING, 122 IFLA_CAN_BITTIMING_CONST, 123 IFLA_CAN_CLOCK, 124 IFLA_CAN_STATE, 125 IFLA_CAN_CTRLMODE, 126 IFLA_CAN_RESTART_MS, 127 IFLA_CAN_RESTART, 128 IFLA_CAN_BERR_COUNTER, 129 IFLA_CAN_DATA_BITTIMING, 130 IFLA_CAN_DATA_BITTIMING_CONST, 131 IFLA_CAN_TERMINATION, 132 IFLA_CAN_TERMINATION_CONST, 133 IFLA_CAN_BITRATE_CONST, 134 IFLA_CAN_DATA_BITRATE_CONST, 135 IFLA_CAN_BITRATE_MAX, 136 __IFLA_CAN_MAX 137 }; 138 139 #define IFLA_CAN_MAX (__IFLA_CAN_MAX - 1) 140 141 /* u16 termination range: 1..65535 Ohms */ 142 #define CAN_TERMINATION_DISABLED 0 143 144 #endif /* !_UAPI_CAN_NETLINK_H */ 145