gprspower.c

基于linux和s3c2440的gpio驱动程序

//written by bcng xiyong,2007-7-1
//set gpj4 to zero to give a kill signal to chip ltc2950

//a guidline about how to use gpio_driver
//p[0] is the address of the iocon of the io
//p[1] is the bit place, from 0 to xx,
//for example, GPJ4, p[1] is 0x4;

//for write function, the 3th parameter, if the second bit is set,  them use keep before   

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>

#define GPJCON 0x560000d0
#define GPJ2 0x2
#define GPHCON 0x56000070
#define GPH0 0x0
#define GPH1 0x1
#define GPH2 0x2
#define GPH3 0x3

int main(int argc,char *argv[])
{
   int fd,FunctionIndex,boolON=1;
  
   unsigned long j[2];
   unsigned long h1[2],h2[2],h3[2],h4[2];
   char *charon="on";
   
   if ((argc>2)||(argc<2))
   {
                printf("parameter error\n");
		return 0;
   }
   
   //printf("param  is %s\n",*(argv+1)); 	
   
   if ( !strcmp( *(argv+1),"on") ) boolON=1;
   else
   	if ( !strcmp( *(argv+1),"off") ) boolON=0;
   	else
   	{
                printf("parameter error\n");
		return 0;
        }
   
   fd=open("/dev/gpio",O_RDWR | O_NOCTTY);
   if (fd < 0)
        {
                printf("can not open gpio!\n");
		return 0;
        }

   j[0]=GPJCON;  
   j[1]=GPJ2;    //GprsPowerControl
   h1[0]=GPHCON; 
   h1[1]=GPH2;   //TXD
   h2[0]=GPHCON;  
   h2[1]=GPH3;   //RXD
   h3[0]=GPHCON;  
   h3[1]=GPH0;   //nCTS0
   h4[0]=GPHCON;  
   h4[1]=GPH1;   //nRTS0 
  
  if (boolON)
  {
      printf("GPRS POWRE ON\n");
      write(fd,j,1);
      write(fd,h1,2);
      write(fd,h2,2);
      write(fd,h3,2);
      write(fd,h4,2);
      
  }
  else
  {
      printf("GPRS POWER OFF\n");
      write(fd,j,0);
      write(fd,h1,0);
      write(fd,h2,0);
      write(fd,h3,0);
      write(fd,h4,0);
      
  }    
  close(fd);    
  return 1;
   
}