include/linux/can/netlink.h

   1 /*
   2  * linux/can/netlink.h
   3  *
   4  * Definitions for the CAN netlink interface
   5  *
   6  * Copyright (c) 2009 Wolfgang Grandegger <wg@grandegger.com>
   7  *
   8  */
   9
  10 #ifndef CAN_NETLINK_H
  11 #define CAN_NETLINK_H
  12
  13 #include <linux/types.h>
  14
  15 /*
  16  * CAN bit-timing parameters
  17  *
  18  * For further information, please read chapter "8 BIT TIMING
  19  * REQUIREMENTS" of the "Bosch CAN Specification version 2.0"
  20  * at http://www.semiconductors.bosch.de/pdf/can2spec.pdf.
  21  */
  22 struct can_bittiming {
  23         __u32 bitrate;          /* Bit-rate in bits/second */
  24         __u32 sample_point;     /* Sample point in one-tenth of a percent */
  25         __u32 tq;               /* Time quanta (TQ) in nanoseconds */
  26         __u32 prop_seg;         /* Propagation segment in TQs */
  27         __u32 phase_seg1;       /* Phase buffer segment 1 in TQs */
  28         __u32 phase_seg2;       /* Phase buffer segment 2 in TQs */
  29         __u32 sjw;              /* Synchronisation jump width in TQs */
  30         __u32 brp;              /* Bit-rate prescaler */
  31 };
  32
  33 /*
  34  * CAN harware-dependent bit-timing constant
  35  *
  36  * Used for calculating and checking bit-timing parameters
  37  */
  38 struct can_bittiming_const {
  39         char name[16];          /* Name of the CAN controller hardware */
  40         __u32 tseg1_min;        /* Time segement 1 = prop_seg + phase_seg1 */
  41         __u32 tseg1_max;
  42         __u32 tseg2_min;        /* Time segement 2 = phase_seg2 */
  43         __u32 tseg2_max;
  44         __u32 sjw_max;          /* Synchronisation jump width */
  45         __u32 brp_min;          /* Bit-rate prescaler */
  46         __u32 brp_max;
  47         __u32 brp_inc;
  48 };
  49
  50 /*
  51  * CAN clock parameters
  52  */
  53 struct can_clock {
  54         __u32 freq;             /* CAN system clock frequency in Hz */
  55 };
  56
  57 /*
  58  * CAN operational and error states
  59  */
  60 enum can_state {
  61         CAN_STATE_ERROR_ACTIVE = 0,     /* RX/TX error count < 96 */
  62         CAN_STATE_ERROR_WARNING,        /* RX/TX error count < 128 */
  63         CAN_STATE_ERROR_PASSIVE,        /* RX/TX error count < 256 */
  64         CAN_STATE_BUS_OFF,              /* RX/TX error count >= 256 */
  65         CAN_STATE_STOPPED,              /* Device is stopped */
  66         CAN_STATE_SLEEPING,             /* Device is sleeping */
  67         CAN_STATE_MAX
  68 };
  69
  70 /*
  71  * CAN bus error counters
  72  */
  73 struct can_berr_counter {
  74         __u16 txerr;
  75         __u16 rxerr;
  76 };
  77
  78 /*
  79  * CAN controller mode
  80  */
  81 struct can_ctrlmode {
  82         __u32 mask;
  83         __u32 flags;
  84 };
  85
  86 #define CAN_CTRLMODE_LOOPBACK           0x01    /* Loopback mode */
  87 #define CAN_CTRLMODE_LISTENONLY         0x02    /* Listen-only mode */
  88 #define CAN_CTRLMODE_3_SAMPLES          0x04    /* Triple sampling mode */
  89 #define CAN_CTRLMODE_ONE_SHOT           0x08    /* One-Shot mode */
  90 #define CAN_CTRLMODE_BERR_REPORTING     0x10    /* Bus-error reporting */
  91
  92 /*
  93  * CAN device statistics
  94  */
  95 struct can_device_stats {
  96         __u32 bus_error;        /* Bus errors */
  97         __u32 error_warning;    /* Changes to error warning state */
  98         __u32 error_passive;    /* Changes to error passive state */
  99         __u32 bus_off;          /* Changes to bus off state */
 100         __u32 arbitration_lost; /* Arbitration lost errors */
 101         __u32 restarts;         /* CAN controller re-starts */
 102 };
 103
 104 /*
 105  * CAN netlink interface
 106  */
 107 enum {
 108         IFLA_CAN_UNSPEC,
 109         IFLA_CAN_BITTIMING,
 110         IFLA_CAN_BITTIMING_CONST,
 111         IFLA_CAN_CLOCK,
 112         IFLA_CAN_STATE,
 113         IFLA_CAN_CTRLMODE,
 114         IFLA_CAN_RESTART_MS,
 115         IFLA_CAN_RESTART,
 116         IFLA_CAN_BERR_COUNTER,
 117         __IFLA_CAN_MAX
 118 };
 119
 120 #define IFLA_CAN_MAX    (__IFLA_CAN_MAX - 1)
 121
 122 #endif /* CAN_NETLINK_H */