File chrdev.h

FileList > dmabuf > chrdev.h

#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include "module.h"

Classes

Type	Name
struct	chrdev
struct	chrdev_device

Public Static Functions

Type	Name
struct chrdev *	chrdev_alloc (const char * name, int count)
struct chrdev_device *	chrdev_device_add (struct chrdev * chrdev, int minor, const struct file_operations * fops, struct device * parent, void * private_data)
void	chrdev_device_del (struct chrdev_device * chrdev_device)
void	chrdev_free (struct chrdev * chrdev)

Public Static Functions Documentation

function chrdev_alloc

static struct chrdev * chrdev_alloc (
    const char * name,
    int count
)

chrdev = kzalloc()
chrdev->class = create_calss(name)
alloc_chrdev_region(&chrdev->dev, count, name)

Parameters:

name - name of class and associated device or driver
count - required number of minor numbers
fops - file_operations for this device

Returns:

pointer to struct chrdev

Return value:

-EINVAL - if name == NULL or count <= 0
-ENOMEM - out of memory
- errors from class_create and alloc_chrdev_region

function chrdev_device_add

static struct chrdev_device * chrdev_device_add (
    struct chrdev * chrdev,
    int minor,
    const struct file_operations * fops,
    struct device * parent,
    void * private_data
)

chrdev_device = chrdev->devices[minor]
cdev_init(&chrdev_device->cdev)
cdev_add(&chrdev_device->cdev)
chrdev_device->device = device_create(parent, drvdata, "${name}${minor}")

Parameters:

chrdev - pointer to struct chrdev
minor - minor number for this device
parent - parent struct device

Returns:

pointer to struct chrdev_device

Return value:

-EINVAL - invalid minor number
- errors from cdev_add and device_create

function chrdev_device_del

static void chrdev_device_del (
    struct chrdev_device * chrdev_device
)

function chrdev_free

static void chrdev_free (
    struct chrdev * chrdev
)

The documentation for this class was generated from the following file midas_fe/kerneldriver/dmabuf/chrdev.h