how to write data into a device file?

 
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Old 08-02-2010
how to write data into a device file?

Hi,
I am working in device drivers. I am new to device drivers. i have invoked chardev.c.
the driver is insmoded. now i want to write something into this and i want to look what i have written. but i don't know how to write and see. please help me
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STRUCT 
USB_DEVICE_DR(9) Host-Side Data Types and Macro STRUCT USB_DEVICE_DR(9) NAME
struct_usb_device_driver - identifies USB device driver to usbcore SYNOPSIS
struct usb_device_driver { const char * name; int (* probe) (struct usb_device *udev); void (* disconnect) (struct usb_device *udev); int (* suspend) (struct usb_device *udev, pm_message_t message); int (* resume) (struct usb_device *udev, pm_message_t message); struct usbdrv_wrap drvwrap; unsigned int supports_autosuspend:1; }; MEMBERS
name The driver name should be unique among USB drivers, and should normally be the same as the module name. probe Called to see if the driver is willing to manage a particular device. If it is, probe returns zero and uses dev_set_drvdata to associate driver-specific data with the device. If unwilling to manage the device, return a negative errno value. disconnect Called when the device is no longer accessible, usually because it has been (or is being) disconnected or the driver's module is being unloaded. suspend Called when the device is going to be suspended by the system. resume Called when the device is being resumed by the system. drvwrap Driver-model core structure wrapper. supports_autosuspend if set to 0, the USB core will not allow autosuspend for devices bound to this driver. DESCRIPTION
USB drivers must provide all the fields listed above except drvwrap. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 STRUCT USB_DEVICE_DR(9)