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 can_device_stats can_stats;
36 struct can_bittiming bittiming;
37 const struct can_bittiming_const *bittiming_const;
38 struct can_clock clock;
42 u32 ctrlmode_supported;
45 struct timer_list restart_timer;
47 int (*do_set_bittiming)(struct net_device *dev);
48 int (*do_set_mode)(struct net_device *dev, enum can_mode mode);
49 int (*do_get_state)(const struct net_device *dev,
50 enum can_state *state);
51 int (*do_get_berr_counter)(const struct net_device *dev,
52 struct can_berr_counter *bec);
54 unsigned int echo_skb_max;
55 struct sk_buff **echo_skb;
57 #ifdef CONFIG_CAN_LEDS
58 struct led_trigger *tx_led_trig;
59 char tx_led_trig_name[CAN_LED_NAME_SZ];
60 struct led_trigger *rx_led_trig;
61 char rx_led_trig_name[CAN_LED_NAME_SZ];
66 * get_can_dlc(value) - helper macro to cast a given data length code (dlc)
67 * to __u8 and ensure the dlc value to be max. 8 bytes.
69 * To be used in the CAN netdriver receive path to ensure conformance with
70 * ISO 11898-1 Chapter 8.4.2.3 (DLC field)
72 #define get_can_dlc(i) (min_t(__u8, (i), CAN_MAX_DLC))
73 #define get_canfd_dlc(i) (min_t(__u8, (i), CANFD_MAX_DLC))
75 /* Drop a given socketbuffer if it does not contain a valid CAN frame. */
76 static inline int can_dropped_invalid_skb(struct net_device *dev,
79 const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
81 if (skb->protocol == htons(ETH_P_CAN)) {
82 if (unlikely(skb->len != CAN_MTU ||
83 cfd->len > CAN_MAX_DLEN))
85 } else if (skb->protocol == htons(ETH_P_CANFD)) {
86 if (unlikely(skb->len != CANFD_MTU ||
87 cfd->len > CANFD_MAX_DLEN))
96 dev->stats.tx_dropped++;
100 /* get data length from can_dlc with sanitized can_dlc */
101 u8 can_dlc2len(u8 can_dlc);
103 /* map the sanitized data length to an appropriate data length code */
104 u8 can_len2dlc(u8 len);
106 struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max);
107 void free_candev(struct net_device *dev);
109 int open_candev(struct net_device *dev);
110 void close_candev(struct net_device *dev);
112 int register_candev(struct net_device *dev);
113 void unregister_candev(struct net_device *dev);
115 int can_restart_now(struct net_device *dev);
116 void can_bus_off(struct net_device *dev);
118 void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
120 unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx);
121 void can_free_echo_skb(struct net_device *dev, unsigned int idx);
123 struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf);
124 struct sk_buff *alloc_can_err_skb(struct net_device *dev,
125 struct can_frame **cf);
127 #endif /* CAN_DEV_H */