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...
Defines
#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	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.
static int	eccdev_vma_fault (struct vm_area_struct *vma,struct vm_fault *vmf)
	Page fault callback for a virtual memory area.
int	ec_cdev_init (ec_cdev_t *cdev, ec_master_t *master, dev_t dev_num)
	Constructor.
void	ec_cdev_clear (ec_cdev_t *cdev)
	Destructor.
Variables
static struct file_operations	eccdev_fops
	File operation callbacks for the EtherCAT character device.
struct vm_operations_struct	eccdev_vm_ops
	Callbacks for a virtual memory area retrieved with ecdevc_mmap().

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Detailed Description

EtherCAT master character device.

Definition in file cdev.c.

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Function Documentation

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 228 of file cdev.c.

static int eccdev_vma_fault	(	struct vm_area_struct *	vma,
		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:

vma	Virtual memory area.
vmf	Fault data.

Definition at line 255 of file cdev.c.

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 108 of file cdev.c.

void ec_cdev_clear

(

ec_cdev_t *

cdev

)

Destructor.

Parameters:

cdev	EtherCAT XML device

Definition at line 134 of file cdev.c.

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Variable Documentation

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 75 of file cdev.c.

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 85 of file cdev.c.