summaryrefslogtreecommitdiff
path: root/include/linux/can/dev.h
blob: fb0ab651a04196ac247b718221cd857de0cc5365 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * linux/can/dev.h
 *
 * Definitions for the CAN network device driver interface
 *
 * Copyright (C) 2006 Andrey Volkov <avolkov@varma-el.com>
 *               Varma Electronics Oy
 *
 * Copyright (C) 2008 Wolfgang Grandegger <wg@grandegger.com>
 *
 */

#ifndef CAN_DEV_H
#define CAN_DEV_H

#include <linux/can.h>
#include <linux/can/netlink.h>
#include <linux/can/error.h>
#include <linux/can/led.h>

/*
 * CAN mode
 */
enum can_mode {
	CAN_MODE_STOP = 0,
	CAN_MODE_START,
	CAN_MODE_SLEEP
};

/*
 * CAN common private data
 */
struct can_priv {
	struct can_device_stats can_stats;

	struct can_bittiming bittiming;
	const struct can_bittiming_const *bittiming_const;
	struct can_clock clock;

	enum can_state state;
	u32 ctrlmode;
	u32 ctrlmode_supported;

	int restart_ms;
	struct timer_list restart_timer;

	int (*do_set_bittiming)(struct net_device *dev);
	int (*do_set_mode)(struct net_device *dev, enum can_mode mode);
	int (*do_get_state)(const struct net_device *dev,
			    enum can_state *state);
	int (*do_get_berr_counter)(const struct net_device *dev,
				   struct can_berr_counter *bec);

	unsigned int echo_skb_max;
	struct sk_buff **echo_skb;

#ifdef CONFIG_CAN_LEDS
	struct led_trigger *tx_led_trig;
	char tx_led_trig_name[CAN_LED_NAME_SZ];
	struct led_trigger *rx_led_trig;
	char rx_led_trig_name[CAN_LED_NAME_SZ];
#endif
};

/*
 * get_can_dlc(value) - helper macro to cast a given data length code (dlc)
 * to __u8 and ensure the dlc value to be max. 8 bytes.
 *
 * To be used in the CAN netdriver receive path to ensure conformance with
 * ISO 11898-1 Chapter 8.4.2.3 (DLC field)
 */
#define get_can_dlc(i)		(min_t(__u8, (i), CAN_MAX_DLC))
#define get_canfd_dlc(i)	(min_t(__u8, (i), CANFD_MAX_DLC))

/* Drop a given socketbuffer if it does not contain a valid CAN frame. */
static inline int can_dropped_invalid_skb(struct net_device *dev,
					  struct sk_buff *skb)
{
	const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;

	if (skb->protocol == htons(ETH_P_CAN)) {
		if (unlikely(skb->len != CAN_MTU ||
			     cfd->len > CAN_MAX_DLEN))
			goto inval_skb;
	} else if (skb->protocol == htons(ETH_P_CANFD)) {
		if (unlikely(skb->len != CANFD_MTU ||
			     cfd->len > CANFD_MAX_DLEN))
			goto inval_skb;
	} else
		goto inval_skb;

	return 0;

inval_skb:
	kfree_skb(skb);
	dev->stats.tx_dropped++;
	return 1;
}

/* get data length from can_dlc with sanitized can_dlc */
u8 can_dlc2len(u8 can_dlc);

/* map the sanitized data length to an appropriate data length code */
u8 can_len2dlc(u8 len);

struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max);
void free_candev(struct net_device *dev);

/* a candev safe wrapper around netdev_priv */
struct can_priv *safe_candev_priv(struct net_device *dev);

int open_candev(struct net_device *dev);
void close_candev(struct net_device *dev);

int register_candev(struct net_device *dev);
void unregister_candev(struct net_device *dev);

int can_restart_now(struct net_device *dev);
void can_bus_off(struct net_device *dev);

void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
		      unsigned int idx);
unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx);
void can_free_echo_skb(struct net_device *dev, unsigned int idx);

struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf);
struct sk_buff *alloc_can_err_skb(struct net_device *dev,
				  struct can_frame **cf);

#endif /* CAN_DEV_H */