/*
 * -----------------------------------------------------------
 * NVDevice
 *	Access to nonvolatile devices
 * -----------------------------------------------------------
 */
#include "NVDevice.h"
#include   "Rtos.h"

static NVDevice *first_nvdevice = NULL;

void
NVDevice_Register(NVDevice *nvdev) 
{
	OS_EnterRegion();
	nvdev->next = first_nvdevice; 
	first_nvdevice = nvdev;	
	OS_LeaveRegion();
}

#if 0
void
NVDevice_UnRegister(NVDevice *nvdev) 
{
	NVDevice *cursor,*prev;
	OS_EnterRegion();
	for(prev=NULL,cursor=first_nvdevice;cursor;prev=cursor,cursor=cursor->next) {
		if(cursor == nvdev) {
			if(prev) {
				prev->next = cursor->next;
			} else {
				first_nvdevice = cursor->next;
			}
			break;
		} 
	}
	OS_LeaveRegion();
}
#endif

static NVDevice *
NVDevice_Find(uint16_t addr)
{
	NVDevice *cursor;
	OS_EnterRegion();
	for(cursor=first_nvdevice;cursor;cursor=cursor->next) {
		if(cursor->addr == addr) {
			OS_LeaveRegion();
			return cursor;
		} 
	}
	OS_LeaveRegion();
	return NULL;
}
int
NVDevice_Write(uint16_t dev_addr,uint16_t mem_addr,const uint8_t *data,uint16_t len) 
{
	NVDevice *nvdev = NVDevice_Find(dev_addr);
	if(nvdev && nvdev->write) {
		return nvdev->write(nvdev->owner,dev_addr,mem_addr,data,len);
	}
	return -1;
}
int
NVDevice_Read(uint16_t dev_addr,uint16_t mem_addr,uint8_t *data,uint16_t len) 
{
	NVDevice *nvdev = NVDevice_Find(dev_addr);
	if(nvdev && nvdev->read) {
		return nvdev->read(nvdev->owner,dev_addr,mem_addr,data,len);
	}
	return -1;
}