ds1302c.c

标准linux 2.4.20 针对ds1302 的RTC 源码,具有充电功能!

/*!***************************************************************************
*!
*! FILE NAME  : ds1302.c
*!
*! DESCRIPTION: Implements an interface for the DS1302 RTC through Etrax I/O
*!
*! Functions exported: ds1302_readreg, ds1302_writereg, ds1302_init, get_rtc_status
*!
*! $Log: ds1302.c,v $
*! Revision 1.11  2001/06/14 12:35:52  jonashg
*! The ATA hack is back. It is unfortunately the only way to set g27 to output.
*!
*! Revision 1.9  2001/06/14 10:00:14  jonashg
*! No need for tempudelay to be inline anymore (had to adjust the usec to
*! loops conversion because of this to make it slow enough to be a udelay).
*!
*! Revision 1.8  2001/06/14 08:06:32  jonashg
*! Made tempudelay delay usecs (well, just a tad more).
*!
*! Revision 1.7  2001/06/13 14:18:11  jonashg
*! Only allow processes with SYS_TIME capability to set time and charge.
*!
*! Revision 1.6  2001/06/12 15:22:07  jonashg
*! * Made init function __init.
*! * Parameter to out_byte() is unsigned char.
*! * The magic number 42 has got a name.
*! * Removed comment about /proc (nothing is exported there).
*!
*! Revision 1.5  2001/06/12 14:35:13  jonashg
*! Gave the module a name and added it to printk's.
*!
*! Revision 1.4  2001/05/31 14:53:40  jonashg
*! Made tempudelay() inline so that the watchdog doesn't reset (see
*! function comment).
*!
*! Revision 1.3  2001/03/26 16:03:06  bjornw
*! Needs linux/config.h
*!
*! Revision 1.2  2001/03/20 19:42:00  bjornw
*! Use the ETRAX prefix on the DS1302 options
*!
*! Revision 1.1  2001/03/20 09:13:50  magnusmn
*! Linux 2.4 port
*!
*! Revision 1.10  2000/07/05 15:38:23  bjornw
*! Dont update kernel time when a RTC_SET_TIME is done
*!
*! Revision 1.9  2000/03/02 15:42:59  macce
*! * Hack to make RTC work on all 2100/2400
*!
*! Revision 1.8  2000/02/23 16:59:18  torbjore
*! added setup of R_GEN_CONFIG when RTC is connected to the generic port.
*!
*! Revision 1.7  2000/01/17 15:51:43  johana
*! Added RTC_SET_CHARGE ioctl to enable trickle charger.
*!
*! Revision 1.6  1999/10/27 13:19:47  bjornw
*! Added update_xtime_from_cmos which reads back the updated RTC into the kernel.
*! /dev/rtc calls it now.
*!
*! Revision 1.5  1999/10/27 12:39:37  bjornw
*! Disabled superuser check. Anyone can now set the time.
*!
*! Revision 1.4  1999/09/02 13:27:46  pkj
*! Added shadow for R_PORT_PB_CONFIG.
*! Renamed port_g_shadow to port_g_data_shadow.
*!
*! Revision 1.3  1999/09/02 08:28:06  pkj
*! Made it possible to select either port PB or the generic port for the RST
*! signal line to the DS1302 RTC.
*! Also make sure the RST bit is configured as output on Port PB (if used).
*!
*! Revision 1.2  1999/09/01 14:47:20  bjornw
*! Added support for /dev/rtc operations with ioctl RD_TIME and SET_TIME to read
*! and set the date. Register as major 121.
*!
*! Revision 1.1  1999/09/01 09:45:29  bjornw
*! Implemented a DS1302 RTC driver.
*!
*!
*! ---------------------------------------------------------------------------
*!
*! (C) Copyright 1999, 2000, 2001  Axis Communications AB, LUND, SWEDEN
*!
*! $Id: ds1302.c,v 1.11 2001/06/14 12:35:52 jonashg Exp $
*!
*!***************************************************************************/
/*
#include <linux/config.h>

#include <linux/fs.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <asm/uaccess.h>
#include <asm/system.h>
//#include <asm/svinto.h>
#include <asm/io.h>*/
#include <linux/fs.h>
#include <linux/iobuf.h>
#include <linux/major.h>   
#include <linux/blkdev.h>
#include <linux/capability.h>
#include <linux/smp_lock.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/module.h>


//#include <asm/rtc.h>
//#include <linux/rtc.h>
//#include "ds1302c.h"

#define RTCC_RD_TIME 0x01
#define RTCC_SET_TIME 0x02
#define RTCC_SET_CHARGE 0x03

int    dsc1302_open(struct inode*, struct file *);
int    dsc1302_close(struct inode*, struct file *);
int    rtcc_ioctl(struct inode*inode,struct file *flip,unsigned int cmd,unsigned long arg);


#define DS1302_RST  GPIO_F7
#define DS1302_SCL  GPIO_F4
#define DS1302_SDA  GPIO_F6

#define INN  0
#define OUTT 1


//#define RTC_MAJOR_NR 121 /* local major, change later */
static int RTCC_MAJOR_NR=0;

static devfs_handle_t devfs_handle;
//static const char dsc1302_name[] = "ds1302c";










/* Probe for the chip by writing something to its RAM and try reading it back. */

//#define MAGIC_PATTERN 0x42








static unsigned char days_in_mo[] = 
    {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

/* ioctl that supports RTC_RD_TIME and RTC_SET_TIME (read and set time/date). */

int rtcc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
	  unsigned long arg) 
{
  unsigned long flags;

	switch(cmd) {
		case RTCC_RD_TIME:	/* read the time/date from RTC	*/
		{
			printk("RTC READ....\n");
			return 0;
		}

		case RTCC_SET_TIME:	/* set the RTC */
		{
			printk("RTC WRITE....\n");
			return 0;
		}

		case RTCC_SET_CHARGE: /* set the RTC TRICKLE CHARGE register */
		{
			return 0;
		}                
		default:
			return -ENOIOCTLCMD;
	}
}




/* The various file operations we support. */

static struct file_operations rtcc_fops = {
        ioctl:          rtcc_ioctl,	
        open:           dsc1302_open,
        release:        dsc1302_close,
}; 

/* Just probe for the RTC and register the device to handle the ioctl needed. */

int __init dsc1302_init(void) 
{ 
	int ret;
	//set_gpio_ctrl(GPIO_MODE_OUT | DS1302_SCL);
	//set_gpio_ctrl(GPIO_MODE_OUT | DS1302_RST);
	//set_gpio_pullup(DS1302_SCL);
	//set_gpio_pullup(DS1302_RST);

//	if (!ds1302_probe()) {
//#ifdef CONFIG_ETRAX_DS1302_RST_ON_GENERIC_PORT
		/*
		 * The only way to set g27 to output is to enable ATA.
		 *
		 * Make sure that R_GEN_CONFIG is setup correct.
		 */
    	//	genconfig_shadow = ((genconfig_shadow &
				    // ~IO_MASK(R_GEN_CONFIG, ata))
				  // | 
				   //(IO_STATE(R_GEN_CONFIG, ata, select)));    
    	//	*R_GEN_CONFIG = genconfig_shadow;
    		//if (!ds1302_probe())
      			//return -1;
//#else
    // 	printk("probe fail....\n");
    //  return -1;
//#endif
  	//}
  /*
	if (ret=register_chrdev(RTC_MAJOR_NR, ds1302_name, &rtc_fops)) {
		printk(KERN_INFO "%s: unable to get major %d for rtc\n", 
		       ds1302_name, RTC_MAJOR_NR);
		return -1;
		*/
		ret = register_chrdev(0, "ds1302c", &rtcc_fops); 
		if (ret < 0) { 
			printk("Driver register error!\n"); 
			return ret; 
			}
	    RTCC_MAJOR_NR=ret;	
	  devfs_handle = devfs_register(NULL, "ds1302c", DEVFS_FL_DEFAULT,RTCC_MAJOR_NR, 0, S_IFCHR | S_IRUSR | S_IWUSR,&rtcc_fops, NULL);
	  return 0;
}


int dsc1302_release(struct inode*inode, struct file *filp)
{ 
  devfs_unregister(devfs_handle);
	unregister_chrdev(RTCC_MAJOR_NR, "ds1302c"); 
}


int dsc1302_open(struct inode*inode, struct file *filp)
{
	return 0;
}

int  dsc1302_close(struct inode*inode, struct file *filp)
{ 
	return 0;
}

module_init(dsc1302_init); //用户加载该驱动时执行insmod gpio_driv.o就会自动调用gpio_init函数，它是驱动
//的入口点，相当于应用程序的main函数。
module_exit(dsc1302_release); //用户卸载该驱动rmmod gpio_driv时执行