dev.c

ADS环境下的类似linux内核的操作系统

/* MShowTec - www.mshowtec.com
** msLinux dev.c ver1.0
** 20051221 lmjx create [e-mail]
**
*/

#define MSLINUX_DEV_C

#include "dev.h"

struct device
{
	char dev_name[DEV_NAME_LEN];
	int dev_id;
	int cmd;
	int error;
	long ioctrl_para;
	long (*ioctrl_fn) (void);	
}mslinux_dev[MSLINUX_DEV_NR];

void dev_init(void)
{
	int i;

	for (i = 0; i < MSLINUX_DEV_NR; i++)
	{
		memset(&mslinux_dev[i],0,sizeof(struct device));
		mslinux_dev[i].dev_id = -1;
	}
}

long ioctrl(int dev,int cmd,long para)
{
	long ret = 0;
	
	if(dev >=DEV_NAME_LEN){
		return -dev;
	}
	if(mslinux_dev[dev].dev_id != dev){
		return -dev;
	}
	mslinux_dev[dev].cmd = cmd;
	mslinux_dev[dev].error = 0;
	mslinux_dev[dev].ioctrl_para = para;
	if(mslinux_dev[dev].ioctrl_fn)
		ret = mslinux_dev[dev].ioctrl_fn();
	return ret;
}

int dev_register(int dev,long (*ioctrl_fn) (void))
{
	if(dev >=DEV_NAME_LEN){
		return -dev;
	}
	if((mslinux_dev[dev].dev_id == -1)||(mslinux_dev[dev].dev_id == dev)){
		mslinux_dev[dev].dev_id = dev;		
		mslinux_dev[dev].cmd = 0;
		mslinux_dev[dev].error = 0;
		mslinux_dev[dev].ioctrl_para = 0;
		mslinux_dev[dev].ioctrl_fn = ioctrl_fn;
		return 0;
	}
	return -dev;
}

int dev_get_cmd(int dev)
{
	if(dev >=DEV_NAME_LEN){
		return -dev;
	}
	if(mslinux_dev[dev].dev_id != dev){
		return -dev;
	}
	return mslinux_dev[dev].cmd;
}

int dev_get_error(int dev)
{
	if(dev >=DEV_NAME_LEN){
		return -dev;
	}
	if(mslinux_dev[dev].dev_id != dev){
		return -dev;
	}
	return mslinux_dev[dev].error;
}

long dev_get_para(int dev)
{
	if(dev >=DEV_NAME_LEN){
		return -dev;
	}
	if(mslinux_dev[dev].dev_id != dev){
		return -dev;
	}
	return mslinux_dev[dev].ioctrl_para;
}