UM0851 datasheet(108/245 Pages) STMICROELECTRONICS

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Communication device drivers

UM0851

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Doc ID 16604 Rev 2

/* SockAddr */

struct sockaddr_can {

sa_family_t can_family;

int

can_ifindex;

union {

/* transport protocol class address info */

struct { canid_t rx_id, tx_id; } tp;

/* reserved for future */

} can_addr;

};

The struct sockaddr_can has an interface index like the PF_PACKET socket, which also

binds to a specific interface.

4.9.4

SPEAr CAN driver

The SPEAr CAN driver uses the socket-CAN framework to provide a network driver as an

interface for the user-land applications.

The CAN driver exposes itself to the kernel as a platform driver through the struct

spr_can_driver, whose members are described below:

/* SPEAr CAN driver */

static struct platform_driver spr_can_driver = {

.driver

= {

.name

= DRV_NAME,

.probe

= spr_can_drv_probe,

.remove

= spr_can_drv_remove,

#ifdef CONFIG_PM

.suspend

= spr_can_drv_suspend,

.resume

= spr_can_drv_resume,

#endif

/* CONFIG_PM */

};

The CAN driver inserts a data structure for each newly detected interface into a global list of

network devices.

Each interface is described by a struct net_device item, which is defined in

`linux/netdevice.h`. This structure must be allocated dynamically. The kernel function

provided to perform this allocation is alloc_ccandev(), which has the following prototype:

/* sizeof_priv is the size of SPEAr320 CAN driver's "private data" area. */

struct net_device *alloc_ccandev(int sizeof_priv)

Once the net_device structure has been initialized, the process of registration is completed

by passing the same to register_ccandev()

The access to the SPEAr CAN driver private data is done via the standard call provided by

Linux kernel:

struct ccan_priv *priv = netdev_priv(dev);

The private data structure used by the CAN driver is described below:

struct ccan_priv {

struct can_priv can;

struct net_device *dev;

int tx_object;

int last_status;

struct delayed_work work;

u16 (*read_reg)(struct net_device *dev,

enum c_regs reg);

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