4 * Definitions for the CAN network device driver interface
6 * Copyright (C) 2006 Andrey Volkov <avolkov@varma-el.com>
9 * Copyright (C) 2008 Wolfgang Grandegger <wg@grandegger.com>
16 #include <linux/can.h>
17 #include <linux/can/netlink.h>
18 #include <linux/can/error.h>
19 #include <linux/can/led.h>
31 * CAN common private data
34 struct net_device
*dev
;
35 struct can_device_stats can_stats
;
37 struct can_bittiming bittiming
;
38 const struct can_bittiming_const
*bittiming_const
;
39 struct can_clock clock
;
43 u32 ctrlmode_supported
;
46 struct delayed_work restart_work
;
48 int (*do_set_bittiming
)(struct net_device
*dev
);
49 int (*do_set_mode
)(struct net_device
*dev
, enum can_mode mode
);
50 int (*do_get_state
)(const struct net_device
*dev
,
51 enum can_state
*state
);
52 int (*do_get_berr_counter
)(const struct net_device
*dev
,
53 struct can_berr_counter
*bec
);
55 unsigned int echo_skb_max
;
56 struct sk_buff
**echo_skb
;
58 #ifdef CONFIG_CAN_LEDS
59 struct led_trigger
*tx_led_trig
;
60 char tx_led_trig_name
[CAN_LED_NAME_SZ
];
61 struct led_trigger
*rx_led_trig
;
62 char rx_led_trig_name
[CAN_LED_NAME_SZ
];
67 * get_can_dlc(value) - helper macro to cast a given data length code (dlc)
68 * to __u8 and ensure the dlc value to be max. 8 bytes.
70 * To be used in the CAN netdriver receive path to ensure conformance with
71 * ISO 11898-1 Chapter 8.4.2.3 (DLC field)
73 #define get_can_dlc(i) (min_t(__u8, (i), CAN_MAX_DLC))
74 #define get_canfd_dlc(i) (min_t(__u8, (i), CANFD_MAX_DLC))
76 /* Drop a given socketbuffer if it does not contain a valid CAN frame. */
77 static inline int can_dropped_invalid_skb(struct net_device
*dev
,
80 const struct canfd_frame
*cfd
= (struct canfd_frame
*)skb
->data
;
82 if (skb
->protocol
== htons(ETH_P_CAN
)) {
83 if (unlikely(skb
->len
!= CAN_MTU
||
84 cfd
->len
> CAN_MAX_DLEN
))
86 } else if (skb
->protocol
== htons(ETH_P_CANFD
)) {
87 if (unlikely(skb
->len
!= CANFD_MTU
||
88 cfd
->len
> CANFD_MAX_DLEN
))
97 dev
->stats
.tx_dropped
++;
101 /* get data length from can_dlc with sanitized can_dlc */
102 u8
can_dlc2len(u8 can_dlc
);
104 /* map the sanitized data length to an appropriate data length code */
105 u8
can_len2dlc(u8 len
);
107 struct net_device
*alloc_candev(int sizeof_priv
, unsigned int echo_skb_max
);
108 void free_candev(struct net_device
*dev
);
110 /* a candev safe wrapper around netdev_priv */
111 struct can_priv
*safe_candev_priv(struct net_device
*dev
);
113 int open_candev(struct net_device
*dev
);
114 void close_candev(struct net_device
*dev
);
116 int register_candev(struct net_device
*dev
);
117 void unregister_candev(struct net_device
*dev
);
119 int can_restart_now(struct net_device
*dev
);
120 void can_bus_off(struct net_device
*dev
);
122 void can_put_echo_skb(struct sk_buff
*skb
, struct net_device
*dev
,
124 unsigned int can_get_echo_skb(struct net_device
*dev
, unsigned int idx
);
125 void can_free_echo_skb(struct net_device
*dev
, unsigned int idx
);
127 struct sk_buff
*alloc_can_skb(struct net_device
*dev
, struct can_frame
**cf
);
128 struct sk_buff
*alloc_can_err_skb(struct net_device
*dev
,
129 struct can_frame
**cf
);
131 #endif /* CAN_DEV_H */