Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=34a8e501fe83f3b572eee56a6fca5111ab8cdf65
Commit:     34a8e501fe83f3b572eee56a6fca5111ab8cdf65
Parent:     e5d5cf2442038b8ad3e0f90b00e5acdd18d5fa98
Author:     Jesper Nilsson <[EMAIL PROTECTED]>
AuthorDate: Thu Jan 17 15:17:07 2008 +0100
Committer:  Jesper Nilsson <[EMAIL PROTECTED]>
CommitDate: Fri Feb 8 11:06:29 2008 +0100

    CRIS v10: Update driver for pcf8563
    
    - Use mutex instead of spinlock, fixes kernel bugzilla report 8339.
    - Make sure that pcf8563_init can be called multiple times but only setup 
once.
    - Change RTC_VLOW_RD -> RTC_VL_READ, RTC_VLOW_SET -> RTC_VL_CLR
    - Cache the voltage low value at driver init so the battery status
      information does not get 'accidentally' cleared when setting the RTC time.
    - Add weekday handling.
    - Correct leapyear handling to include 100 and 400 year exceptions.
    - Correct whitespace and formatting errors.
    - Remove useless CVS id tag.
---
 arch/cris/arch-v10/drivers/pcf8563.c |  691 ++++++++++++++++++----------------
 1 files changed, 369 insertions(+), 322 deletions(-)

diff --git a/arch/cris/arch-v10/drivers/pcf8563.c 
b/arch/cris/arch-v10/drivers/pcf8563.c
dissimilarity index 60%
index c263b82..52103d1 100644
--- a/arch/cris/arch-v10/drivers/pcf8563.c
+++ b/arch/cris/arch-v10/drivers/pcf8563.c
@@ -1,322 +1,369 @@
-/*
- * PCF8563 RTC
- *
- * From Phillips' datasheet:
- *
- * The PCF8563 is a CMOS real-time clock/calendar optimized for low power
- * consumption. A programmable clock output, interrupt output and voltage
- * low detector are also provided. All address and data are transferred
- * serially via two-line bidirectional I2C-bus. Maximum bus speed is
- * 400 kbits/s. The built-in word address register is incremented
- * automatically after each written or read bute.
- *
- * Copyright (c) 2002, Axis Communications AB
- * All rights reserved.
- *
- * Author: Tobias Anderberg <[EMAIL PROTECTED]>.
- *
- * $Id: pcf8563.c,v 1.11 2005/03/07 13:13:07 starvik Exp $
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/ioctl.h>
-#include <linux/delay.h>
-#include <linux/bcd.h>
-#include <linux/capability.h>
-
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/arch/svinto.h>
-#include <asm/rtc.h>
-#include "i2c.h"
-
-#define PCF8563_MAJOR 121              /* Local major number. */
-#define DEVICE_NAME "rtc"              /* Name which is registered in 
/proc/devices. */
-#define PCF8563_NAME "PCF8563"
-#define DRIVER_VERSION "$Revision: 1.11 $"
-
-/* I2C bus slave registers. */
-#define RTC_I2C_READ           0xa3
-#define RTC_I2C_WRITE          0xa2
-
-/* Two simple wrapper macros, saves a few keystrokes. */
-#define rtc_read(x) i2c_readreg(RTC_I2C_READ, x)
-#define rtc_write(x,y) i2c_writereg(RTC_I2C_WRITE, x, y)
-
-static DEFINE_SPINLOCK(rtc_lock); /* Protect state etc */
-       
-static const unsigned char days_in_month[] =
-       { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
-
-int pcf8563_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
-
-static const struct file_operations pcf8563_fops = {
-       .owner = THIS_MODULE,
-       .ioctl = pcf8563_ioctl,
-};
-
-unsigned char
-pcf8563_readreg(int reg) 
-{
-       unsigned char res = i2c_readreg(RTC_I2C_READ, reg);
-
-       /* The PCF8563 does not return 0 for unimplemented bits */
-       switch(reg)
-       {
-               case RTC_SECONDS:
-               case RTC_MINUTES:
-                    res &= 0x7f;
-                    break;
-               case RTC_HOURS:
-               case RTC_DAY_OF_MONTH:
-                    res &= 0x3f;
-                    break;
-               case RTC_MONTH:
-                    res = (res & 0x1f) - 1;  /* PCF8563 returns month in range 
1-12 */
-                    break;
-       }
-       return res;
-}
-
-void
-pcf8563_writereg(int reg, unsigned char val) 
-{
-#ifdef CONFIG_ETRAX_RTC_READONLY
-       if (reg == RTC_CONTROL1 || (reg >= RTC_SECONDS && reg <= RTC_YEAR))
-               return;
-#endif
-
-       rtc_write(reg, val);
-}
-
-void
-get_rtc_time(struct rtc_time *tm)
-{
-       tm->tm_sec = rtc_read(RTC_SECONDS);
-       tm->tm_min = rtc_read(RTC_MINUTES);
-       tm->tm_hour = rtc_read(RTC_HOURS);
-       tm->tm_mday = rtc_read(RTC_DAY_OF_MONTH);
-       tm->tm_mon = rtc_read(RTC_MONTH);
-       tm->tm_year = rtc_read(RTC_YEAR);
-
-       if (tm->tm_sec & 0x80)
-               printk(KERN_WARNING "%s: RTC Low Voltage - date/time is not 
reliable!\n", PCF8563_NAME);
-
-       tm->tm_year = BCD_TO_BIN(tm->tm_year) + ((tm->tm_mon & 0x80) ? 100 : 0);
-       tm->tm_sec &= 0x7f;
-       tm->tm_min &= 0x7f;
-       tm->tm_hour &= 0x3f;
-       tm->tm_mday &= 0x3f;
-       tm->tm_mon &= 0x1f;
-
-       BCD_TO_BIN(tm->tm_sec);
-       BCD_TO_BIN(tm->tm_min);
-       BCD_TO_BIN(tm->tm_hour);
-       BCD_TO_BIN(tm->tm_mday);
-       BCD_TO_BIN(tm->tm_mon);
-       tm->tm_mon--; /* Month is 1..12 in RTC but 0..11 in linux */
-}
-
-int __init
-pcf8563_init(void)
-{
-       int ret;
-
-       if ((ret = i2c_init())) {
-               printk(KERN_CRIT "pcf8563_init: failed to init i2c\n");
-               return ret;
-       }
-
-       /*
-        * First of all we need to reset the chip. This is done by
-        * clearing control1, control2 and clk freq, clear the 
-        * Voltage Low bit, and resetting all alarms.
-        */
-       if (rtc_write(RTC_CONTROL1, 0x00) < 0)
-               goto err;
-
-       if (rtc_write(RTC_CONTROL2, 0x00) < 0)
-               goto err;
-
-       if (rtc_write(RTC_CLOCKOUT_FREQ, 0x00) < 0)
-               goto err;
-
-       /* Clear the VL bit in the seconds register. */
-       ret = rtc_read(RTC_SECONDS);
-       
-       if (rtc_write(RTC_SECONDS, (ret & 0x7f)) < 0)
-               goto err;
-               
-       /* Reset the alarms. */
-       if (rtc_write(RTC_MINUTE_ALARM, 0x00) < 0)
-               goto err;
-       
-       if (rtc_write(RTC_HOUR_ALARM, 0x00) < 0)
-               goto err;
-       
-       if (rtc_write(RTC_DAY_ALARM, 0x00) < 0)
-               goto err;
-       
-       if (rtc_write(RTC_WEEKDAY_ALARM, 0x00) < 0)
-               goto err;
-        
-       /* Check for low voltage, and warn about it.. */
-       if (rtc_read(RTC_SECONDS) & 0x80)
-               printk(KERN_WARNING "%s: RTC Low Voltage - date/time is not 
reliable!\n", PCF8563_NAME);
-       
-       return 0;
-
-err:
-       printk(KERN_INFO "%s: Error initializing chip.\n", PCF8563_NAME);
-       return -1;
-}
-
-void __exit
-pcf8563_exit(void)
-{
-       unregister_chrdev(PCF8563_MAJOR, DEVICE_NAME);
-}
-
-/*
- * ioctl calls for this driver. Why return -ENOTTY upon error? Because
- * POSIX says so!
- */
-int
-pcf8563_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, 
unsigned long arg)
-{
-       /* Some sanity checks. */
-       if (_IOC_TYPE(cmd) != RTC_MAGIC)
-               return -ENOTTY;
-
-       if (_IOC_NR(cmd) > RTC_MAX_IOCTL)
-               return -ENOTTY;
-
-       switch (cmd) {
-               case RTC_RD_TIME:
-                       {
-                               struct rtc_time tm;
-
-                               spin_lock(&rtc_lock);
-                               get_rtc_time(&tm);
-
-                               if (copy_to_user((struct rtc_time *) arg, &tm, 
sizeof(struct rtc_time))) {
-                                       spin_unlock(&rtc_lock);
-                                       return -EFAULT;
-                               }
-
-                               spin_unlock(&rtc_lock);
-                               return 0;
-                       }
-                       break;
-               case RTC_SET_TIME:
-                       {
-#ifdef CONFIG_ETRAX_RTC_READONLY
-                               return -EPERM;
-#else
-                               int leap;
-                               int century;
-                               struct rtc_time tm;
-
-                               memset(&tm, 0, sizeof (struct rtc_time));
-                               if (!capable(CAP_SYS_TIME))
-                                       return -EPERM;
-
-                               if (copy_from_user(&tm, (struct rtc_time *) 
arg, sizeof(struct rtc_time)))
-                                       return -EFAULT;
-
-                               /* Convert from struct tm to struct rtc_time. */
-                               tm.tm_year += 1900;
-                               tm.tm_mon += 1;
-                               
-                               leap = ((tm.tm_mon == 2) && ((tm.tm_year % 4) 
== 0)) ? 1 : 0;
-
-                               /* Perform some sanity checks. */
-                               if ((tm.tm_year < 1970) ||
-                                   (tm.tm_mon > 12) ||
-                                   (tm.tm_mday == 0) ||
-                                   (tm.tm_mday > days_in_month[tm.tm_mon] + 
leap) ||
-                                   (tm.tm_hour >= 24) ||
-                                   (tm.tm_min >= 60) ||
-                                   (tm.tm_sec >= 60))
-                                       return -EINVAL;
-
-                               century = (tm.tm_year >= 2000) ? 0x80 : 0;
-                               tm.tm_year = tm.tm_year % 100;
-
-                               BIN_TO_BCD(tm.tm_year);
-                               BIN_TO_BCD(tm.tm_mday);
-                               BIN_TO_BCD(tm.tm_hour);
-                               BIN_TO_BCD(tm.tm_min);
-                               BIN_TO_BCD(tm.tm_sec);
-                               tm.tm_mon |= century;
-
-                               spin_lock(&rtc_lock);
-                               
-                               rtc_write(RTC_YEAR, tm.tm_year);
-                               rtc_write(RTC_MONTH, tm.tm_mon);
-                               rtc_write(RTC_DAY_OF_MONTH, tm.tm_mday);
-                               rtc_write(RTC_HOURS, tm.tm_hour);
-                               rtc_write(RTC_MINUTES, tm.tm_min);
-                               rtc_write(RTC_SECONDS, tm.tm_sec);
-
-                               spin_unlock(&rtc_lock);
-
-                               return 0;
-#endif /* !CONFIG_ETRAX_RTC_READONLY */
-                       }
-
-               case RTC_VLOW_RD:
-               {
-                       int vl_bit = 0;
-
-                       if (rtc_read(RTC_SECONDS) & 0x80) {
-                               vl_bit = 1;
-                               printk(KERN_WARNING "%s: RTC Voltage Low - 
reliable "
-                                      "date/time information is no longer 
guaranteed!\n",
-                                      PCF8563_NAME);
-                       }
-                       if (copy_to_user((int *) arg, &vl_bit, sizeof(int)))
-                               return -EFAULT;
-
-                       return 0;
-               }
-
-               case RTC_VLOW_SET:
-               {
-                       /* Clear the VL bit in the seconds register */
-                       int ret = rtc_read(RTC_SECONDS);
-
-                       rtc_write(RTC_SECONDS, (ret & 0x7F));
-
-                       return 0;
-               }
-
-               default:
-                               return -ENOTTY;
-       }
-
-       return 0;
-}
-
-static int __init
-pcf8563_register(void)
-{
-       pcf8563_init();
-       if (register_chrdev(PCF8563_MAJOR, DEVICE_NAME, &pcf8563_fops) < 0) {
-               printk(KERN_INFO "%s: Unable to get major number %d for RTC 
device.\n",
-                      PCF8563_NAME, PCF8563_MAJOR);
-               return -1;
-       }
-
-       printk(KERN_INFO "%s Real-Time Clock Driver, %s\n", PCF8563_NAME, 
DRIVER_VERSION);
-        return 0;
-}
-
-module_init(pcf8563_register);
-module_exit(pcf8563_exit);
+/*
+ * PCF8563 RTC
+ *
+ * From Phillips' datasheet:
+ *
+ * The PCF8563 is a CMOS real-time clock/calendar optimized for low power
+ * consumption. A programmable clock output, interrupt output and voltage
+ * low detector are also provided. All address and data are transferred
+ * serially via two-line bidirectional I2C-bus. Maximum bus speed is
+ * 400 kbits/s. The built-in word address register is incremented
+ * automatically after each written or read byte.
+ *
+ * Copyright (c) 2002-2007, Axis Communications AB
+ * All rights reserved.
+ *
+ * Author: Tobias Anderberg <[EMAIL PROTECTED]>.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/ioctl.h>
+#include <linux/delay.h>
+#include <linux/bcd.h>
+#include <linux/mutex.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/rtc.h>
+
+#include "i2c.h"
+
+#define PCF8563_MAJOR 121      /* Local major number. */
+#define DEVICE_NAME "rtc"      /* Name which is registered in /proc/devices. */
+#define PCF8563_NAME "PCF8563"
+#define DRIVER_VERSION "$Revision: 1.24 $"
+
+/* I2C bus slave registers. */
+#define RTC_I2C_READ           0xa3
+#define RTC_I2C_WRITE          0xa2
+
+/* Two simple wrapper macros, saves a few keystrokes. */
+#define rtc_read(x) i2c_readreg(RTC_I2C_READ, x)
+#define rtc_write(x,y) i2c_writereg(RTC_I2C_WRITE, x, y)
+
+static DEFINE_MUTEX(rtc_lock); /* Protect state etc */
+
+static const unsigned char days_in_month[] =
+       { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+
+int pcf8563_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
+
+/* Cache VL bit value read at driver init since writing the RTC_SECOND
+ * register clears the VL status.
+ */
+static int voltage_low;
+
+static const struct file_operations pcf8563_fops = {
+       .owner = THIS_MODULE,
+       .ioctl = pcf8563_ioctl,
+};
+
+unsigned char
+pcf8563_readreg(int reg)
+{
+       unsigned char res = rtc_read(reg);
+
+       /* The PCF8563 does not return 0 for unimplemented bits. */
+       switch (reg) {
+       case RTC_SECONDS:
+       case RTC_MINUTES:
+               res &= 0x7F;
+               break;
+       case RTC_HOURS:
+       case RTC_DAY_OF_MONTH:
+               res &= 0x3F;
+               break;
+       case RTC_WEEKDAY:
+               res &= 0x07;
+               break;
+       case RTC_MONTH:
+               res &= 0x1F;
+               break;
+       case RTC_CONTROL1:
+               res &= 0xA8;
+               break;
+       case RTC_CONTROL2:
+               res &= 0x1F;
+               break;
+       case RTC_CLOCKOUT_FREQ:
+       case RTC_TIMER_CONTROL:
+               res &= 0x83;
+               break;
+       }
+       return res;
+}
+
+void
+pcf8563_writereg(int reg, unsigned char val)
+{
+       rtc_write(reg, val);
+}
+
+void
+get_rtc_time(struct rtc_time *tm)
+{
+       tm->tm_sec  = rtc_read(RTC_SECONDS);
+       tm->tm_min  = rtc_read(RTC_MINUTES);
+       tm->tm_hour = rtc_read(RTC_HOURS);
+       tm->tm_mday = rtc_read(RTC_DAY_OF_MONTH);
+       tm->tm_wday = rtc_read(RTC_WEEKDAY);
+       tm->tm_mon  = rtc_read(RTC_MONTH);
+       tm->tm_year = rtc_read(RTC_YEAR);
+
+       if (tm->tm_sec & 0x80) {
+               printk(KERN_ERR "%s: RTC Voltage Low - reliable date/time "
+                      "information is no longer guaranteed!\n", PCF8563_NAME);
+       }
+
+       tm->tm_year  = BCD_TO_BIN(tm->tm_year) +
+                      ((tm->tm_mon & 0x80) ? 100 : 0);
+       tm->tm_sec  &= 0x7F;
+       tm->tm_min  &= 0x7F;
+       tm->tm_hour &= 0x3F;
+       tm->tm_mday &= 0x3F;
+       tm->tm_wday &= 0x07; /* Not coded in BCD. */
+       tm->tm_mon  &= 0x1F;
+
+       BCD_TO_BIN(tm->tm_sec);
+       BCD_TO_BIN(tm->tm_min);
+       BCD_TO_BIN(tm->tm_hour);
+       BCD_TO_BIN(tm->tm_mday);
+       BCD_TO_BIN(tm->tm_mon);
+       tm->tm_mon--; /* Month is 1..12 in RTC but 0..11 in linux */
+}
+
+int __init
+pcf8563_init(void)
+{
+       static int res;
+       static int first = 1;
+
+       if (!first)
+               return res;
+       first = 0;
+
+       /* Initiate the i2c protocol. */
+       res = i2c_init();
+       if (res < 0) {
+               printk(KERN_CRIT "pcf8563_init: Failed to init i2c.\n");
+               return res;
+       }
+
+       /*
+        * First of all we need to reset the chip. This is done by
+        * clearing control1, control2 and clk freq and resetting
+        * all alarms.
+        */
+       if (rtc_write(RTC_CONTROL1, 0x00) < 0)
+               goto err;
+
+       if (rtc_write(RTC_CONTROL2, 0x00) < 0)
+               goto err;
+
+       if (rtc_write(RTC_CLOCKOUT_FREQ, 0x00) < 0)
+               goto err;
+
+       if (rtc_write(RTC_TIMER_CONTROL, 0x03) < 0)
+               goto err;
+
+       /* Reset the alarms. */
+       if (rtc_write(RTC_MINUTE_ALARM, 0x80) < 0)
+               goto err;
+
+       if (rtc_write(RTC_HOUR_ALARM, 0x80) < 0)
+               goto err;
+
+       if (rtc_write(RTC_DAY_ALARM, 0x80) < 0)
+               goto err;
+
+       if (rtc_write(RTC_WEEKDAY_ALARM, 0x80) < 0)
+               goto err;
+
+       /* Check for low voltage, and warn about it. */
+       if (rtc_read(RTC_SECONDS) & 0x80) {
+               voltage_low = 1;
+               printk(KERN_WARNING "%s: RTC Voltage Low - reliable "
+                      "date/time information is no longer guaranteed!\n",
+                      PCF8563_NAME);
+       }
+
+       return res;
+
+err:
+       printk(KERN_INFO "%s: Error initializing chip.\n", PCF8563_NAME);
+       res = -1;
+       return res;
+}
+
+void __exit
+pcf8563_exit(void)
+{
+       unregister_chrdev(PCF8563_MAJOR, DEVICE_NAME);
+}
+
+/*
+ * ioctl calls for this driver. Why return -ENOTTY upon error? Because
+ * POSIX says so!
+ */
+int pcf8563_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
+       unsigned long arg)
+{
+       /* Some sanity checks. */
+       if (_IOC_TYPE(cmd) != RTC_MAGIC)
+               return -ENOTTY;
+
+       if (_IOC_NR(cmd) > RTC_MAX_IOCTL)
+               return -ENOTTY;
+
+       switch (cmd) {
+       case RTC_RD_TIME:
+       {
+               struct rtc_time tm;
+
+               mutex_lock(&rtc_lock);
+               memset(&tm, 0, sizeof tm);
+               get_rtc_time(&tm);
+
+               if (copy_to_user((struct rtc_time *) arg, &tm,
+                                sizeof tm)) {
+                       spin_unlock(&rtc_lock);
+                       return -EFAULT;
+               }
+
+               mutex_unlock(&rtc_lock);
+
+               return 0;
+       }
+       case RTC_SET_TIME:
+       {
+               int leap;
+               int year;
+               int century;
+               struct rtc_time tm;
+
+               memset(&tm, 0, sizeof tm);
+               if (!capable(CAP_SYS_TIME))
+                       return -EPERM;
+
+               if (copy_from_user(&tm, (struct rtc_time *) arg, sizeof tm))
+                       return -EFAULT;
+
+               /* Convert from struct tm to struct rtc_time. */
+               tm.tm_year += 1900;
+               tm.tm_mon += 1;
+
+               /*
+                * Check if tm.tm_year is a leap year. A year is a leap
+                * year if it is divisible by 4 but not 100, except
+                * that years divisible by 400 _are_ leap years.
+                */
+               year = tm.tm_year;
+               leap = (tm.tm_mon == 2) &&
+                       ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
+
+               /* Perform some sanity checks. */
+               if ((tm.tm_year < 1970) ||
+                   (tm.tm_mon > 12) ||
+                   (tm.tm_mday == 0) ||
+                   (tm.tm_mday > days_in_month[tm.tm_mon] + leap) ||
+                   (tm.tm_wday >= 7) ||
+                   (tm.tm_hour >= 24) ||
+                   (tm.tm_min >= 60) ||
+                   (tm.tm_sec >= 60))
+                       return -EINVAL;
+
+               century = (tm.tm_year >= 2000) ? 0x80 : 0;
+               tm.tm_year = tm.tm_year % 100;
+
+               BIN_TO_BCD(tm.tm_year);
+               BIN_TO_BCD(tm.tm_mon);
+               BIN_TO_BCD(tm.tm_mday);
+               BIN_TO_BCD(tm.tm_hour);
+               BIN_TO_BCD(tm.tm_min);
+               BIN_TO_BCD(tm.tm_sec);
+               tm.tm_mon |= century;
+
+               mutex_lock(&rtc_lock);
+
+               rtc_write(RTC_YEAR, tm.tm_year);
+               rtc_write(RTC_MONTH, tm.tm_mon);
+               rtc_write(RTC_WEEKDAY, tm.tm_wday); /* Not coded in BCD. */
+               rtc_write(RTC_DAY_OF_MONTH, tm.tm_mday);
+               rtc_write(RTC_HOURS, tm.tm_hour);
+               rtc_write(RTC_MINUTES, tm.tm_min);
+               rtc_write(RTC_SECONDS, tm.tm_sec);
+
+               mutex_unlock(&rtc_lock);
+
+               return 0;
+       }
+       case RTC_VL_READ:
+               if (voltage_low) {
+                       printk(KERN_ERR "%s: RTC Voltage Low - "
+                              "reliable date/time information is no "
+                              "longer guaranteed!\n", PCF8563_NAME);
+               }
+
+               if (copy_to_user((int *) arg, &voltage_low, sizeof(int)))
+                       return -EFAULT;
+               return 0;
+
+       case RTC_VL_CLR:
+       {
+               /* Clear the VL bit in the seconds register in case
+                * the time has not been set already (which would
+                * have cleared it). This does not really matter
+                * because of the cached voltage_low value but do it
+                * anyway for consistency. */
+
+               int ret = rtc_read(RTC_SECONDS);
+
+               rtc_write(RTC_SECONDS, (ret & 0x7F));
+
+               /* Clear the cached value. */
+               voltage_low = 0;
+
+               return 0;
+       }
+       default:
+               return -ENOTTY;
+       }
+
+       return 0;
+}
+
+static int __init pcf8563_register(void)
+{
+       if (pcf8563_init() < 0) {
+               printk(KERN_INFO "%s: Unable to initialize Real-Time Clock "
+                      "Driver, %s\n", PCF8563_NAME, DRIVER_VERSION);
+               return -1;
+       }
+
+       if (register_chrdev(PCF8563_MAJOR, DEVICE_NAME, &pcf8563_fops) < 0) {
+               printk(KERN_INFO "%s: Unable to get major number %d for RTC 
device.\n",
+                      PCF8563_NAME, PCF8563_MAJOR);
+               return -1;
+       }
+
+       printk(KERN_INFO "%s Real-Time Clock Driver, %s\n", PCF8563_NAME,
+              DRIVER_VERSION);
+
+       /* Check for low voltage, and warn about it. */
+       if (voltage_low) {
+               printk(KERN_WARNING "%s: RTC Voltage Low - reliable date/time "
+                      "information is no longer guaranteed!\n", PCF8563_NAME);
+       }
+
+       return 0;
+}
+
+module_init(pcf8563_register);
+module_exit(pcf8563_exit);
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