magic-leds.c

周立功的magic2410开发板的led驱动程序

/*
****************************************Copyright (c)**************************************************
**                               Guangzhou Zhiyuan Electronic Co.,LTD.
**                                     graduate school
**                                 http://www.zyinside.com
**
**------------------------------------- File Info ------------------------------------------------------
** File name:           magic-leds.c
** Last modified Date:  2005-12-28
** Last Version:        1.0
** Descriptions:        Driver for LEDs and BEEP on MagicARM2410.
**                      Based on Linux 2.4.18. 
**------------------------------------------------------------------------------------------------------
** Created by:          Chenxibing
** Created date:        2005-12-27
** Version:             1.0
** Descriptions:        Preliminary version.
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
********************************************************************************************************
*/

#ifndef __KERNEL__
    #define __KERNEL__
#endif

#ifndef MODULE
    #define MODULE
#endif

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>

//#include <linux/poll.h>
//#include <linux/spinlock.h>
//#include <linux/irq.h>
//#include <linux/miscdevice.h>
//#include <linux/delay.h>

#include <asm/hardware.h>

#define DEVICE_NAME	"magic-leds"
//#define LED_MAJOR   	231	//can be 231~239 or 240~254

MODULE_LICENSE("Proprietary");
MODULE_DESCRIPTION("Guangzhou Zhiyuan Electronic Co.,LTD.\ngraduate school\nhttp://www.zyinside.com");
MODULE_SUPPORTED_DEVICE("Linux 2.4.18 & MagicARM2410");
MODULE_AUTHOR("Chenxibing");

/*
*******************************************************************************************************
** LEDs' informations.
*******************************************************************************************************
*/
static unsigned long leds_table [] = 
{
	GPIO_E11,
	GPIO_E12,
	GPIO_H4,
	GPIO_H6,
	GPIO_H10,
};

/*
*******************************************************************************************************
** Function name: magic_leds_ioctl()
** Descriptions	: IO control function
** Input:
**	inode	: information of device
**      filp	: pointer of file
**     	cmd	: command
**      arg	: additive parameter
** Output:
**	0	: OK
**    	other	: not OK
** Created by	: Chenxibing
** Created Date	: 2005-12-27
**-----------------------------------------------------------------------------------------------------
** Modified by	:
** Modified Date: 
**-----------------------------------------------------------------------------------------------------
*******************************************************************************************************
*/
static int magic_leds_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
{
	if (arg > 4) return -EINVAL;

	switch(cmd) 
	{
		case 0:
		case 1:
			write_gpio_bit(leds_table[arg], cmd);
		default:
			return -EINVAL;
	}
}

/*
*******************************************************************************************************
** Function name: magic_leds_open()
** Descriptions	: open leds
** Input:
**	inode	: information of device
**      filp	: pointer of file
** Output:
**	0	: OK
**    	other	: not OK
** Created by	: Chenxibing
** Created Date	: 2005-12-27
**-----------------------------------------------------------------------------------------------------
** Modified by	:
** Modified Date: 
**-----------------------------------------------------------------------------------------------------
*******************************************************************************************************
*/
static int magic_leds_open(struct inode *inode, struct file *filp)
{
	int i;

	for (i = 0; i < 5; i++)
	{
		set_gpio_ctrl (leds_table[i] | GPIO_PULLUP_EN | GPIO_MODE_OUT);
		write_gpio_bit(leds_table[i], 1);
	}

	MOD_INC_USE_COUNT;
	printk(KERN_INFO DEVICE_NAME ": opened.\n");
	return 0;
}

/*
*******************************************************************************************************
** Function name: magic_leds_release()
** Descriptions	: release leds
** Input:
**	inode	: information of device
**      filp	: pointer of file
** Output:
**	0	: OK
**    	other	: not OK
** Created by	: Chenxibing
** Created Date	: 2005-12-27
**-----------------------------------------------------------------------------------------------------
** Modified by	:
** Modified Date: 
**-----------------------------------------------------------------------------------------------------
*******************************************************************************************************
*/
static int magic_leds_release(struct inode *inode, struct file *filp)
{
	MOD_DEC_USE_COUNT;
	printk(KERN_INFO DEVICE_NAME ": released.\n");
	return 0;
}


/*
*******************************************************************************************************
**                                    operations of the driver
*******************************************************************************************************
*/
static struct file_operations magic_leds_fops = 
{
	owner:	THIS_MODULE,
	ioctl:  magic_leds_ioctl,
	open:	magic_leds_open,
	release:	magic_leds_release,
};


/*
*******************************************************************************************************
** Function name: magic_leds_init()
** Descriptions	: register driver
** Input:
**		: NONE
** Output:
**	0	: OK
**    	other	: not OK
** Created by	: Chenxibing
** Created Date	: 2005-12-27
**-----------------------------------------------------------------------------------------------------
** Modified by	:
** Modified Date: 
**-----------------------------------------------------------------------------------------------------
*******************************************************************************************************
*/
static devfs_handle_t devfs_handle;
static int __init magic_leds_init(void)
{
//	int result;

//	result =  register_chrdev(0, DEVICE_NAME, &magic_leds_fops);
//	if (result < 0) 
//	{
//	 	 printk(KERN_ERR DEVICE_NAME ": Failed to register major.\n");
//	 	 return result;
//	}
	devfs_handle = devfs_register(NULL, DEVICE_NAME, DEVFS_FL_AUTO_DEVNUM,
		0, 0, S_IFCHR | S_IRUSR | S_IWUSR, &magic_leds_fops, NULL);

	printk(KERN_INFO DEVICE_NAME ": Initialize OK.\n");
	return 0;
}


/*
*******************************************************************************************************
** Function name: magic_leds_exit()
** Descriptions	: unregister driver
** Input:
**		: NONE
** Output:
**	0	: OK
**    	other	: not OK
** Created by	: Chenxibing
** Created Date	: 2005-12-27
**-----------------------------------------------------------------------------------------------------
** Modified by	:
** Modified Date: 
**-----------------------------------------------------------------------------------------------------
*******************************************************************************************************
*/

static void __exit magic_leds_exit(void)
{
	devfs_unregister(devfs_handle);
//	unregister_chrdev(0, DEVICE_NAME);
}

module_init(magic_leds_init);
module_exit(magic_leds_exit);
/*
********************************************************************************************************
**                                            End of File
********************************************************************************************************
*/