class_device_create

时间：2009-04-02 来源：hsq863

最近一直再弄2410触摸屏的驱动，在读tsdev.c这个文件很多不懂得地方。需要搞清楚，到底触摸屏的设备文件是哪个？mouse0?还是input0?还是ts0?那主设备号，和次设备号又是多少？
这个函数好像是动态创建设备文件的,但是我的cramfs文件系统,还不可写，怎么处理？

Name

class_device_create — creates a class device and registers it with sysfs

Synopsis

struct class_device * class_device_create (	struct class *	cls,
	struct class_device *	parent,
	dev_t	devt,
	struct device *	device,
	const char *	fmt,
		...);

Arguments

cls

pointer to the struct class that this device should be registered to.

parent

pointer to the parent struct class_device of this new device, if any.

devt

the dev_t for the char device to be added.

device

a pointer to a struct device that is assiociated with this class device.

fmt

string for the class device's name

...

variable arguments

Description

This function can be used by char device classes. A struct class_device will be created in sysfs, registered to the specified class. A “dev” file will be created, showing the dev_t for the device, if the dev_t is not 0,0. If a pointer to a parent struct class_device is passed in, the newly created struct class_device will be a child of that device in sysfs. The pointer to the struct class_device will be returned from the call. Any further sysfs files that might be required can be created using this pointer.