Commit | Line | Data |
---|---|---|
39549eef WG |
1 | /* |
2 | * linux/can/dev.h | |
3 | * | |
4 | * Definitions for the CAN network device driver interface | |
5 | * | |
6 | * Copyright (C) 2006 Andrey Volkov <avolkov@varma-el.com> | |
7 | * Varma Electronics Oy | |
8 | * | |
9 | * Copyright (C) 2008 Wolfgang Grandegger <wg@grandegger.com> | |
10 | * | |
39549eef WG |
11 | */ |
12 | ||
13 | #ifndef CAN_DEV_H | |
14 | #define CAN_DEV_H | |
15 | ||
829e0015 | 16 | #include <linux/can.h> |
39549eef WG |
17 | #include <linux/can/netlink.h> |
18 | #include <linux/can/error.h> | |
19 | ||
20 | /* | |
21 | * CAN mode | |
22 | */ | |
23 | enum can_mode { | |
24 | CAN_MODE_STOP = 0, | |
25 | CAN_MODE_START, | |
26 | CAN_MODE_SLEEP | |
27 | }; | |
28 | ||
29 | /* | |
30 | * CAN common private data | |
31 | */ | |
39549eef WG |
32 | struct can_priv { |
33 | struct can_device_stats can_stats; | |
34 | ||
35 | struct can_bittiming bittiming; | |
194b9a4c | 36 | const struct can_bittiming_const *bittiming_const; |
39549eef WG |
37 | struct can_clock clock; |
38 | ||
39 | enum can_state state; | |
40 | u32 ctrlmode; | |
ad72c347 | 41 | u32 ctrlmode_supported; |
39549eef WG |
42 | |
43 | int restart_ms; | |
44 | struct timer_list restart_timer; | |
45 | ||
39549eef WG |
46 | int (*do_set_bittiming)(struct net_device *dev); |
47 | int (*do_set_mode)(struct net_device *dev, enum can_mode mode); | |
48 | int (*do_get_state)(const struct net_device *dev, | |
49 | enum can_state *state); | |
52c793f2 WG |
50 | int (*do_get_berr_counter)(const struct net_device *dev, |
51 | struct can_berr_counter *bec); | |
a6e4bc53 WG |
52 | |
53 | unsigned int echo_skb_max; | |
54 | struct sk_buff **echo_skb; | |
39549eef WG |
55 | }; |
56 | ||
c7cd606f OH |
57 | /* |
58 | * get_can_dlc(value) - helper macro to cast a given data length code (dlc) | |
59 | * to __u8 and ensure the dlc value to be max. 8 bytes. | |
60 | * | |
61 | * To be used in the CAN netdriver receive path to ensure conformance with | |
62 | * ISO 11898-1 Chapter 8.4.2.3 (DLC field) | |
63 | */ | |
1e0625fa OH |
64 | #define get_can_dlc(i) (min_t(__u8, (i), CAN_MAX_DLC)) |
65 | #define get_canfd_dlc(i) (min_t(__u8, (i), CANFD_MAX_DLC)) | |
c7cd606f | 66 | |
3ccd4c61 OH |
67 | /* Drop a given socketbuffer if it does not contain a valid CAN frame. */ |
68 | static inline int can_dropped_invalid_skb(struct net_device *dev, | |
69 | struct sk_buff *skb) | |
70 | { | |
1e0625fa OH |
71 | const struct canfd_frame *cfd = (struct canfd_frame *)skb->data; |
72 | ||
73 | if (skb->protocol == htons(ETH_P_CAN)) { | |
74 | if (unlikely(skb->len != CAN_MTU || | |
75 | cfd->len > CAN_MAX_DLEN)) | |
76 | goto inval_skb; | |
77 | } else if (skb->protocol == htons(ETH_P_CANFD)) { | |
78 | if (unlikely(skb->len != CANFD_MTU || | |
79 | cfd->len > CANFD_MAX_DLEN)) | |
80 | goto inval_skb; | |
81 | } else | |
82 | goto inval_skb; | |
3ccd4c61 OH |
83 | |
84 | return 0; | |
1e0625fa OH |
85 | |
86 | inval_skb: | |
87 | kfree_skb(skb); | |
88 | dev->stats.tx_dropped++; | |
89 | return 1; | |
3ccd4c61 OH |
90 | } |
91 | ||
1e0625fa OH |
92 | /* get data length from can_dlc with sanitized can_dlc */ |
93 | u8 can_dlc2len(u8 can_dlc); | |
94 | ||
95 | /* map the sanitized data length to an appropriate data length code */ | |
96 | u8 can_len2dlc(u8 len); | |
97 | ||
a6e4bc53 | 98 | struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max); |
39549eef WG |
99 | void free_candev(struct net_device *dev); |
100 | ||
101 | int open_candev(struct net_device *dev); | |
102 | void close_candev(struct net_device *dev); | |
103 | ||
104 | int register_candev(struct net_device *dev); | |
105 | void unregister_candev(struct net_device *dev); | |
106 | ||
107 | int can_restart_now(struct net_device *dev); | |
108 | void can_bus_off(struct net_device *dev); | |
109 | ||
a6e4bc53 WG |
110 | void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, |
111 | unsigned int idx); | |
cf5046b3 | 112 | unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx); |
a6e4bc53 | 113 | void can_free_echo_skb(struct net_device *dev, unsigned int idx); |
39549eef | 114 | |
7b6856a0 WG |
115 | struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf); |
116 | struct sk_buff *alloc_can_err_skb(struct net_device *dev, | |
117 | struct can_frame **cf); | |
118 | ||
39549eef | 119 | #endif /* CAN_DEV_H */ |