cdev.c File Reference

EtherCAT master character device. More...

Go to the source code of this file.

Data Structures
struct	ec_cdev_priv_t
	Private data structure for file handles. More...

Macros
#define	DEBUG   0
	Set to 1 to enable device operations debugging.
#define	PAGE_FAULT_VERSION   KERNEL_VERSION(2, 6, 23)
	This is the kernel version from which the .fault member of the vm_operations_struct is usable.
#define	FAULT_RETURN_TYPE   vm_fault_t
#define	VM_DONTDUMP   VM_RESERVED
	VM_RESERVED disappeared in 3.7.

Functions
static int	eccdev_open (struct inode *inode, struct file *filp)
	Called when the cdev is opened.
static int	eccdev_release (struct inode *inode, struct file *filp)
	Called when the cdev is closed.
static long	eccdev_ioctl (struct file *filp, unsigned int cmd, unsigned long arg)
	Called when an ioctl() command is issued.
static int	eccdev_mmap (struct file *filp, struct vm_area_struct *vma)
	Memory-map callback for the EtherCAT character device. More...
static FAULT_RETURN_TYPE	eccdev_vma_fault (struct vm_fault *vmf)
	Page fault callback for a virtual memory area. More...
int	ec_cdev_init (ec_cdev_t *cdev, ec_master_t *master, dev_t dev_num)
	Constructor. More...
void	ec_cdev_clear (ec_cdev_t *cdev)
	Destructor. More...

Variables
static struct file_operations	eccdev_fops
	File operation callbacks for the EtherCAT character device. More...
struct vm_operations_struct	eccdev_vm_ops
	Callbacks for a virtual memory area retrieved with ecdevc_mmap(). More...

Detailed Description

EtherCAT master character device.

Definition in file cdev.c.

Function Documentation

eccdev_mmap()

int eccdev_mmap ( struct file *  filp, struct vm_area_struct *  vma  )

static

Memory-map callback for the EtherCAT character device.

The actual mapping will be done in the eccdev_vma_nopage() callback of the virtual memory area.

Returns

Always zero (success).

Definition at line 236 of file cdev.c.

eccdev_vma_fault()

static FAULT_RETURN_TYPE eccdev_vma_fault ( struct vm_fault *  vmf )

static

Page fault callback for a virtual memory area.

Called at the first access on a virtual-memory area retrieved with ecdev_mmap().

Returns

Zero on success, otherwise a negative error code.

Parameters

vmf	Fault data.

Definition at line 267 of file cdev.c.

ec_cdev_init()

int ec_cdev_init	(	ec_cdev_t *	cdev,
		ec_master_t *	master,
		dev_t	dev_num
	)

Constructor.

Returns

0 in case of success, else < 0

Parameters

cdev	EtherCAT master character device.
master	Parent master.
dev_num	Device number.

Definition at line 116 of file cdev.c.

ec_cdev_clear()

void ec_cdev_clear

(

ec_cdev_t *

cdev

)

Destructor.

Parameters

cdev	EtherCAT XML device

Definition at line 142 of file cdev.c.

Variable Documentation

eccdev_fops

struct file_operations eccdev_fops

static

Initial value:

= {
    .owner          = THIS_MODULE,
    .open           = eccdev_open,
    .release        = eccdev_release,
    .unlocked_ioctl = eccdev_ioctl,
    .mmap           = eccdev_mmap
}

File operation callbacks for the EtherCAT character device.

Definition at line 83 of file cdev.c.

eccdev_vm_ops

struct vm_operations_struct eccdev_vm_ops

Initial value:

= {

    .fault = eccdev_vma_fault



}

Callbacks for a virtual memory area retrieved with ecdevc_mmap().

Definition at line 93 of file cdev.c.