path: root/packages/linux/nslu2-kernel/2.6/30-i2c-x1205.patch

diff -urN linux-2.6.13.1/drivers/i2c/chips/Kconfig nslu2-2.6.13.1/drivers/i2c/chips/Kconfig
--- linux-2.6.13.1/drivers/i2c/chips/Kconfig	2005-09-17 12:42:33.000000000 +0200
+++ nslu2-2.6.13.1/drivers/i2c/chips/Kconfig	2005-09-17 13:46:42.000000000 +0200
@@ -136,4 +136,14 @@
 	  This driver can also be built as a module.  If so, the module
 	  will be called max6875.
 
+config SENSORS_X1205
+       tristate "Xicor X1205 RTC chip"
+       depends on I2C && EXPERIMENTAL
+       select I2C_SENSOR
+       help
+         If you say yes here you get support for the Xicor x1205 RTC chip.
+
+         This driver can also be built as a module.  If so, the module
+         will be called x1205-rtc
+
 endmenu
diff -urN linux-2.6.13.1/drivers/i2c/chips/Makefile nslu2-2.6.13.1/drivers/i2c/chips/Makefile
--- linux-2.6.13.1/drivers/i2c/chips/Makefile	2005-09-17 12:42:33.000000000 +0200
+++ nslu2-2.6.13.1/drivers/i2c/chips/Makefile	2005-09-17 13:35:39.000000000 +0200
@@ -13,6 +13,7 @@
 obj-$(CONFIG_SENSORS_RTC8564)	+= rtc8564.o
 obj-$(CONFIG_ISP1301_OMAP)	+= isp1301_omap.o
 obj-$(CONFIG_TPS65010)		+= tps65010.o
+obj-$(CONFIG_SENSORS_X1205)     += x1205-rtc.o
 
 ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)
 EXTRA_CFLAGS += -DDEBUG
diff -urN linux-2.6.13.1/drivers/i2c/chips/x1205-rtc.c nslu2-2.6.13.1/drivers/i2c/chips/x1205-rtc.c
--- linux-2.6.13.1/drivers/i2c/chips/x1205-rtc.c	1970-01-01 01:00:00.000000000 +0100
+++ nslu2-2.6.13.1/drivers/i2c/chips/x1205-rtc.c	2005-09-17 13:51:03.000000000 +0200
@@ -0,0 +1,547 @@
+/*
+    x1205 - an 12c driver for the Xicor X1205 RTC
+    Copyright 2004 Karen Spearel
+
+    please send all reports to:
+	kas11 at tampabay dot rr dot com
+      
+    based on linux/drivers/acron/char/pcf8583.h
+    Copyright (C) 2000 Russell King
+    
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+/*
+
+ * i2c_adapter is the structure used to identify a physical i2c bus along
+ * with the access algorithms necessary to access it.
+
+struct i2c_adapter {
+	struct module *owner;
+	unsigned int id;  == is algo->id | hwdep.struct->id, for registered values see below
+	unsigned int class;
+	struct i2c_algorithm *algo; the algorithm to access the bus
+	void *algo_data;
+
+	--- administration stuff.
+	int (*client_register)(struct i2c_client *);
+	int (*client_unregister)(struct i2c_client *);
+
+	 data fields that are valid for all devices
+	struct semaphore bus_lock;
+	struct semaphore clist_lock;
+
+	int timeout;
+	int retries;
+	struct device dev;		the adapter device 
+	struct class_device class_dev;	the class device
+
+#ifdef CONFIG_PROC_FS 
+	No need to set this when you initialize the adapter
+	int inode;
+#endif def CONFIG_PROC_FS
+
+	int nr;
+	struct list_head clients;
+	struct list_head list;
+	char name[I2C_NAME_SIZE];
+	struct completion dev_released;
+	struct completion class_dev_released;
+};
+*/
+
+
+/*========== Driver for the X1205 on the Linksys NSLU2 ==================*/
+
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/miscdevice.h>
+#include <linux/device.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/moduleparam.h>
+
+#define		RTC_GETDATETIME		0
+#define		RTC_SETTIME		1
+#define		RTC_SETDATETIME		2
+
+#define		I2C_M_WR		0	// just for consistancy
+
+//  offsets into read buf - add 2 for write buf
+#define		CCR_SEC			0
+#define		CCR_MIN			1
+#define		CCR_HOUR		2
+#define		CCR_MDAY		3
+#define		CCR_MONTH		4
+#define		CCR_YEAR		5
+#define		CCR_WDAY		6
+#define		CCR_Y2K			7
+
+#define		X1205_I2C_BUS_ADDR	0x6f	// hardwired into x1205
+#define		X1205_ALM0_BASE		0x00	// Base address of the ALM0
+#define		X1205_CCR_BASE		0x30	// Base address of the CCR
+#define		X1205_SR_ADDR		0x3f	// Status Register
+#define		X1205_SR_WEL		0x02	// Write Enable Latch bit
+#define		X1205_SR_RWEL		0x04	// Register Write Enable Bit
+#define		X1205_MILBIT		0x80	// this bit set in ccr.hour for 24 hr mode
+#define		NOERR			0
+#define		RTC_NODATE		0
+#define		RTC_DATETOO		1
+
+// comment out next line is your x1205 can't do page writes
+//#define 	X1205PAGEWRITE		1
+#ifdef X1205PAGEWRITE
+#define		DRIVERNAME		"Xicor x1205 RTC Driver v0.9.3.3"
+#else
+#define		DRIVERNAME		"Xicor x1205 RTC Dvr v0.9.3.3NPW"
+#endif
+
+#define		DEBUG			KERN_DEBUG
+
+
+static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm, u8 reg_base);
+static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm, int datetoo, u8 reg_base);
+static int x1205_attach(struct i2c_adapter *adapter);
+static int x1205_detach(struct i2c_client *client);
+static int x1205_validate_tm(struct rtc_time *tm);
+static int x1205_command(struct i2c_client *client, unsigned int cmd, void *arg);
+static int x1205_sync_rtc(void);
+static int x1205_read(struct file *file, char *buf, size_t count, loff_t *ptr);
+static int x1205_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
+static int x1205_read_proc(char *buf, char **start, off_t off, int len, int *eof, void *data);
+
+static struct i2c_driver x1205_driver = {
+	.owner		= THIS_MODULE,
+	.name		= DRIVERNAME,
+	.id		= I2C_DRIVERID_EXP0,
+	.flags		= I2C_DF_NOTIFY,
+	.attach_adapter = &x1205_attach,		//we don't need to probe...x1205 is hardwired @ 0x6f
+	.detach_client	= &x1205_detach,
+	.command	= &x1205_command,		//this prolly never gets called...used internally tho
+};
+
+static struct i2c_client x1205_i2c_client = {
+	.flags		=	0,
+	.addr		=	X1205_I2C_BUS_ADDR,	// chip address - NOTE: 7bit
+	.adapter	=	NULL,			// the adapter we sit on assigned in attach
+	.driver		=	&x1205_driver,		// and our access routines
+	.usage_count	=	0,			// How many accesses currently to this client
+	.dev		=	{},			// the device structure
+	.list		=	{},
+	.name		=	DRIVERNAME,
+	.released	=	{},
+};
+
+static struct file_operations rtc_fops = {
+	owner:		THIS_MODULE,
+	ioctl:		x1205_ioctl,
+	read:		x1205_read,
+};
+
+static struct miscdevice x1205_miscdev = {
+	.minor		= RTC_MINOR,
+	.name		= "rtc",
+	.fops		= &rtc_fops,
+};
+extern int (*set_rtc)(void);
+static unsigned epoch = 1900;		//coresponds to year 0
+static unsigned  rtc_epoch = 2000;
+static const unsigned char days_in_mo[] = 
+{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+//===================================CODE======================================
+// in the routines that deal directly with the x1205 hardware, we use
+// rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
+// Epoch is inited as 2000. Time is set to UT
+//=============================================================================   
+static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm, u8 reg_base)
+{
+	static unsigned char addr[2] = { 0,} ;
+	unsigned char buf[8];	
+	struct i2c_msg msgs[2] = {
+		{ client->addr, I2C_M_WR, 2, addr },	//msg 1 = send base address
+		{ client->addr, I2C_M_RD, 8, buf },	//msg 2 = read sequential data
+	};
+	addr[1] = reg_base;
+	if ((i2c_transfer(client->adapter, msgs, 2)) == 2) {	//did we read 2 messages?
+		printk(KERN_DEBUG "raw x1205 read data  - sec-%02x min-%02x hr-%02x mday-%02x mon-%02x year-%02x wday-%02x y2k-%02x\n", 
+			buf[0],buf[1],buf[2],buf[3],buf[4],buf[5],buf[6], buf[7]);
+		tm->tm_sec  = BCD2BIN(buf[CCR_SEC]);
+		tm->tm_min  = BCD2BIN(buf[CCR_MIN]);
+		buf[CCR_HOUR] &= ~X1205_MILBIT;
+		tm->tm_hour = BCD2BIN(buf[CCR_HOUR]);		//hr is 0-23
+		tm->tm_mday = BCD2BIN(buf[CCR_MDAY]);
+		tm->tm_mon  = BCD2BIN(buf[CCR_MONTH]);
+		rtc_epoch   = BCD2BIN(buf[CCR_Y2K]) * 100;
+		tm->tm_year = BCD2BIN(buf[CCR_YEAR]) + rtc_epoch - epoch;
+		tm->tm_wday = buf[CCR_WDAY];
+		printk(KERN_DEBUG "rtc_time output data - sec-%02d min-%02d hr-%02d mday-%02d mon-%02d year-%02d wday-%02d epoch-%d rtc_epoch-%d\n",
+			tm->tm_sec,tm->tm_min,tm->tm_hour,tm->tm_mday,tm->tm_mon,tm->tm_year,tm->tm_wday,epoch, rtc_epoch);
+	} else {
+		printk(KERN_DEBUG "i2c_transfer Read Error\n");
+		return -EIO;
+	}		
+	
+	return NOERR;
+}
+// x1205pagewrite allows writing a block of registers in msg3 even though the x1205 says
+// nothing about this in its spec. 
+// it needs more testing as it is possible some x1205s are actually not-completely-
+// functional x1226s and there is a reason for the multiple write to not be in the spec.
+// anyhow, it is enabled for the time being...and we even push out luck by sending 10 bytes
+
+static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm, int datetoo, u8 reg_base)
+{
+	static unsigned char wel[3]   = { 0, X1205_SR_ADDR, X1205_SR_WEL };
+	static unsigned char rwel[3]  = { 0, X1205_SR_ADDR, X1205_SR_WEL | X1205_SR_RWEL };
+	static unsigned char diswe[3] = { 0, X1205_SR_ADDR, 0 };
+
+#ifdef X1205PAGEWRITE
+
+	static unsigned char buf[10]   = { 0, X1205_CCR_BASE, };		
+	struct i2c_msg msgs[4] = {
+		{ client->addr, I2C_M_WR, 3, wel   },	//msg 1 = write WEL to to ccr sr
+		{ client->addr, I2C_M_WR, 3, rwel  },	//msg 2 = write RWEL to ccr sr
+		{ client->addr, I2C_M_WR, 10, buf   },	//msg 3 = write ccr base addr +seq data
+		{ client->addr, I2C_M_WR, 3, diswe },	//msg 4 = 0 to ccr sr to disable writes
+	};
+
+	msgs[2].len = 5;					// 5 bytes + addr to set time only
+	buf [1] = reg_base;
+	buf[CCR_SEC+2]  = BIN2BCD(tm->tm_sec);
+	buf[CCR_MIN+2]  = BIN2BCD(tm->tm_min);
+	buf[CCR_HOUR+2] = BIN2BCD(tm->tm_hour) | X1205_MILBIT; // set 24 hour format
+	if (datetoo == 1) {
+		buf[CCR_MDAY+2]  = BIN2BCD(tm->tm_mday);
+		buf[CCR_MONTH+2] = BIN2BCD(tm->tm_mon);		// input is 0-11	
+		buf[CCR_YEAR+2]  = BIN2BCD((tm->tm_year + epoch - rtc_epoch));	// input is yrs since 1900
+		buf[CCR_WDAY+2]  = tm->tm_wday & 7;
+		buf[CCR_Y2K+2]   = BIN2BCD((rtc_epoch/100));
+		msgs[2].len += 5;				//5 more bytes to set date
+	}
+	printk(KERN_DEBUG "rtc_time input - sec-%02d min-%02d hour-%02d mday-%02d mon-%02d year-%02d wday-%02d epoch-%d rtc_epoch-%d\n",
+		tm->tm_sec,tm->tm_min,tm->tm_hour,tm->tm_mday,tm->tm_mon,tm->tm_year,tm->tm_wday, epoch, rtc_epoch);
+	printk(KERN_DEBUG "BCD write data - sec-%02x min-%02x hour-%02x mday-%02x mon-%02x year-%02x wday-%02x y2k-%02x\n",
+		buf[2],buf[3],buf[4],buf[5],buf[6], buf[7], buf[8], buf[9]);
+
+	if ((i2c_transfer(client->adapter, msgs, 4)) != 4)
+		return -EIO;
+	return NOERR;
+	
+#else		//do this if page writes aren't working
+
+	int i,xfer;
+	static unsigned char data[3]  = { 0,};
+	static unsigned char buf[8];
+
+	buf[CCR_SEC]  = BIN2BCD(tm->tm_sec);
+	buf[CCR_MIN]  = BIN2BCD(tm->tm_min);
+	buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_MILBIT; // set 24 hour format
+	if (datetoo == 1) {
+		buf[CCR_MDAY]  = BIN2BCD(tm->tm_mday);
+		buf[CCR_MONTH] = BIN2BCD(tm->tm_mon);		// input is 0-11	
+		buf[CCR_YEAR]  = BIN2BCD((tm->tm_year + epoch - rtc_epoch));	// input is yrs since 1900
+		buf[CCR_WDAY]  = tm->tm_wday & 7;
+		buf[CCR_Y2K]   = BIN2BCD((rtc_epoch/100));
+	}
+	printk(KERN_DEBUG "rtc_time input - sec-%02d min-%02d hour-%02d mday-%02d mon-%02d year-%02d wday-%02d epoch-%d rtc_epoch-%d\n",
+		tm->tm_sec,tm->tm_min,tm->tm_hour,tm->tm_mday,tm->tm_mon,tm->tm_year,tm->tm_wday, epoch, rtc_epoch);
+
+	xfer = i2c_master_send(client, wel, 3);
+	printk(KERN_DEBUG "wen - %x\n", xfer);
+	if (xfer != 3)
+		return -EIO;
+
+	xfer = i2c_master_send(client, rwel, 3);
+	printk(KERN_DEBUG "wenb - %x\n", xfer);
+	if (xfer != 3)
+		return -EIO;
+
+	for (i = 0; i < 8; i++) {
+		data[1] = i + reg_base;
+		data[2] =  buf[i];
+		xfer = i2c_master_send(client, data, 3);
+		printk(KERN_DEBUG "xfer - %d addr - %02x  data - %02x\n", xfer, data[1], data[2]);
+		if (xfer != 3)
+			return -EIO;
+	};
+
+	xfer = i2c_master_send(client, diswe, 3);
+	printk(KERN_DEBUG "wdis - %x\n", xfer);
+	if (xfer != 3)
+		return -EIO;		
+	return NOERR;
+#endif
+}
+//=============================================================================
+
+static int x1205_attach(struct i2c_adapter *adapter)
+{
+	struct rtc_time tm;
+	struct timespec tv;
+	int errno;
+		
+	x1205_i2c_client.adapter = adapter;
+//	x1205_i2c_client.id++;
+
+	if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) != NOERR)	//test for functional driver 
+		return -EIO;
+	
+	if ((errno = i2c_attach_client(&x1205_i2c_client)) != NOERR)
+		return errno;
+
+	tv.tv_nsec = tm.tm_sec * 10000000;
+	tv.tv_sec  = mktime(tm.tm_year+epoch, tm.tm_mon, tm.tm_mday, tm.tm_hour,
+						tm.tm_min, tm.tm_sec);
+	do_settimeofday(&tv);
+	set_rtc = x1205_sync_rtc;
+	
+	printk(KERN_DEBUG "%s attached on adapter %s\n",x1205_i2c_client.name,
+		x1205_i2c_client.adapter->name); //why is this name a null string?
+
+	return NOERR;
+}
+
+static int x1205_detach(struct i2c_client *client)
+{
+	int errno;
+	
+	if ((errno = i2c_detach_client(client)) != 0) {
+		printk(KERN_DEBUG "i2c_detach failed - errno = %d\n", errno);
+		return errno;
+	}
+
+	return NOERR;
+}
+
+// make sure the rtc_time values are in bounds
+static int x1205_validate_tm(struct rtc_time *tm)
+{
+	tm->tm_year += 1900;
+
+	if (tm->tm_year < 1970)
+		return -EINVAL;
+
+	if ((tm->tm_mon > 11) || (tm->tm_mday == 0))
+		return -EINVAL;
+
+	if (tm->tm_mday > (days_in_mo[tm->tm_mon] + ( (tm->tm_mon == 1) && 
+		((!(tm->tm_year % 4) && (tm->tm_year % 100) ) || !(tm->tm_year % 400)))))
+		return -EINVAL;
+
+	if ((tm->tm_year -= epoch) > 255)
+		return -EINVAL;
+			
+	if ((tm->tm_hour >= 24) || (tm->tm_min >= 60) || (tm->tm_sec >= 60))
+		return -EINVAL;
+	return NOERR;
+}
+
+static int x1205_command(struct i2c_client *client, unsigned int cmd, void *tm)
+{
+	int errno, dodate = RTC_DATETOO;
+
+	if (client == NULL || tm == NULL)
+		return -EINVAL;
+	if (!capable(CAP_SYS_TIME))
+		return -EACCES;
+
+	printk(KERN_DEBUG "x1205_command %d\n", cmd);
+
+	switch (cmd) {
+	case RTC_GETDATETIME:
+		return x1205_get_datetime(client, tm, X1205_CCR_BASE);
+
+	case RTC_SETTIME:		// note fall thru
+		dodate = RTC_NODATE;
+	case RTC_SETDATETIME:
+		if ((errno = x1205_validate_tm(tm)) < NOERR)
+			return errno;
+		return x1205_set_datetime(client, tm, dodate, X1205_CCR_BASE);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int x1205_sync_rtc(void)
+{
+	struct rtc_time new_tm, old_tm;
+	unsigned long cur_secs = xtime.tv_sec;
+
+	printk(KERN_DEBUG "x1205_sync_rtc entry\n");
+
+	if (x1205_command(&x1205_i2c_client, RTC_GETDATETIME, &old_tm))
+		return 0;
+
+//	xtime.tv_nsec = old_tm.tm_sec * 10000000;   //FIXME:
+	new_tm.tm_sec  = cur_secs % 60;
+	cur_secs /= 60;
+	new_tm.tm_min  = cur_secs % 60;
+	cur_secs /= 60;
+	new_tm.tm_hour = cur_secs % 24;
+
+	/*
+	 * avoid writing when we're going to change the day
+	 * of the month.  We will retry in the next minute.
+	 * This basically means that if the RTC must not drift
+	 * by more than 1 minute in 11 minutes.
+	 */
+	if ((old_tm.tm_hour == 23 && old_tm.tm_min == 59) ||
+	    (new_tm.tm_hour == 23 && new_tm.tm_min == 59))
+		return 1;
+	printk(KERN_DEBUG "x1205_sync_rtc exit\n");
+
+	return x1205_command(&x1205_i2c_client, RTC_SETTIME, &new_tm);
+}
+
+static int x1205_read(struct file *file, char *buf, size_t count, loff_t *ptr)
+{
+	struct rtc_time tm;
+
+	if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) < NOERR)
+		return -EIO;
+	return copy_to_user(buf, &tm, sizeof(tm)) ? -EFAULT : NOERR;
+}
+
+//==============================================================================
+
+static int x1205_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+		     unsigned long arg)
+{
+	struct rtc_time tm;
+	int errno;
+
+	printk(KERN_DEBUG "ioctl = %x\n", cmd);
+	
+	switch (cmd) {
+	case RTC_RD_TIME:
+		if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) < NOERR)
+			return -EIO;
+		break;
+		
+	case RTC_SET_TIME:
+		if (!capable(CAP_SYS_TIME))
+			return -EACCES;
+
+		if (copy_from_user(&tm, (struct rtc_time *) arg, sizeof(struct rtc_time))) 
+			return -EFAULT;
+		if ((errno = x1205_validate_tm(&tm)) < NOERR)
+			return errno;
+		return x1205_set_datetime(&x1205_i2c_client, &tm, RTC_DATETOO, X1205_CCR_BASE);
+
+	case RTC_ALM_SET:						//FIXME: set Control Regs
+		if (copy_from_user(&tm, (struct rtc_time *) arg, sizeof(struct rtc_time))) 
+			return -EFAULT;
+		return x1205_set_datetime(&x1205_i2c_client, &tm, RTC_DATETOO, X1205_ALM0_BASE);
+
+	case RTC_ALM_READ:
+		if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_ALM0_BASE)) < NOERR)
+			return -EIO;
+		break;
+
+	case RTC_EPOCH_READ:
+
+		return put_user (epoch, (unsigned long __user *)arg);
+
+	case RTC_EPOCH_SET:
+		if (arg < 1900)
+			return -EINVAL;
+
+		if (!capable(CAP_SYS_TIME))
+			return -EACCES;
+
+		epoch = arg;
+		return 0;
+
+	default:
+		return -ENOTTY;
+	}
+	return copy_to_user((void __user *)arg, &tm, sizeof tm) ? -EFAULT : 0;
+
+}
+
+static int x1205_read_proc(char *buf, char **start, off_t off, int len, int *eof, void *data)
+{
+	struct rtc_time tm;
+	int slen, errno;
+
+	if ((errno = x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) < NOERR)
+		return errno;
+
+//	here we return the real year and the month as 1-12 since it is human-readable
+	slen = sprintf(buf, "rtc_time\t: %02d:%02d:%02d\nrtc_date\t: %04d-%02d-%02d\n",
+		tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_year + 1900, tm.tm_mon+1, tm.tm_mday);
+ 	printk(KERN_DEBUG "raw rtc_time\t: %02d:%02d:%02d\nraw rtc_date\t: %04d-%02d-%02d\n",
+		tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_year, tm.tm_mon, tm.tm_mday);
+
+	if (slen <= off + len)
+		*eof = 1;
+	*start = buf + off;
+	slen -= off;
+	if (slen > len)
+		slen = len;
+	if ( slen < 0 )
+		slen = 0;
+
+	return slen;
+}
+
+static int __init x1205_init(void)
+{
+	struct	rtc_time tm;
+	int errno;
+	printk(KERN_INFO "LOADED %s\n", DRIVERNAME);
+
+	if ((errno = i2c_add_driver(&x1205_driver)) != NOERR) {
+		dev_dbg(x1205_i2c_client.dev, "x1205_init failed - errno = %d\n", errno);
+		return (errno);
+	}
+	if ((errno = misc_register(&x1205_miscdev)) != NOERR) {
+		dev_dbg(x1205_i2c_client.dev, "Register Misc Driver failed - errno = %d\n", errno);
+		i2c_del_driver(&x1205_driver);
+		return errno; 
+	}
+	if (create_proc_read_entry("driver/rtc", 0, NULL, x1205_read_proc, NULL) < NOERR)
+		return -ENOMEM;
+	if ((x1205_get_datetime(&x1205_i2c_client, &tm, X1205_CCR_BASE)) != NOERR)	//test for functionality
+		return -EIO;
+
+	return NOERR;	
+}
+
+static void __exit x1205_exit(void)
+{
+	remove_proc_entry("driver/rtc", NULL);
+	misc_deregister(&x1205_miscdev);
+	i2c_del_driver(&x1205_driver);
+	set_rtc = NULL;
+}
+
+MODULE_AUTHOR("Karen Spearel <kas11@tampabay.rr.com>");
+MODULE_DESCRIPTION("Xicor X1205-RTC Driver");
+MODULE_LICENSE("GPL");
+static int debug = 7;
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Debugging enabled = 1");
+
+module_init(x1205_init);
+module_exit(x1205_exit);