patch-2.4.22 linux-2.4.22/arch/cris/drivers/pcf8563.c

• Lines: 379
• Date: 2003-08-25 04:44:39.000000000 -0700
• Orig file: linux-2.4.21/arch/cris/drivers/pcf8563.c
• Orig date: 2003-06-13 07:51:29.000000000 -0700

diff -urN linux-2.4.21/arch/cris/drivers/pcf8563.c linux-2.4.22/arch/cris/drivers/pcf8563.c
@@ -8,14 +8,13 @@
  * 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.
+ * automatically after each written or read byte.
  *
- * Copyright (c) 2002, Axis Communications AB
+ * Copyright (c) 2002-2003, Axis Communications AB
  * All rights reserved.
  *
  * Author: Tobias Anderberg <tobiasa@axis.com>.
  *
- * $Id: pcf8563.c,v 1.4 2002/10/15 09:22:42 tobiasa Exp $
  */
 
 #include <linux/config.h>
@@ -36,19 +35,15 @@
 #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: 1.4 $"
-
-/* I2C bus slave registers. */
-#define RTC_I2C_READ		0xa3
-#define RTC_I2C_WRITE		0xa2
+#define PCF8563_MAJOR	121	/* Local major number. */
+#define DEVICE_NAME	"rtc"	/* Name which is registered in /proc/devices. */
+#define PCF8563_NAME	"PCF8563"
+#define DRIVER_VERSION	"$Revision: 1.15 $"
 
 /* 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 const unsigned char days_in_month[] =
 	{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
 
@@ -64,53 +59,73 @@
 };
 
 unsigned char
-pcf8563_readreg(int reg) 
+pcf8563_readreg(int reg)
 {
-	unsigned char res = i2c_readreg(RTC_I2C_READ, reg);
+	unsigned char res = rtc_read(reg);
 
 	/* The PCF8563 does not return 0 for unimplemented bits */
-	switch(reg)
-	{
+	switch (reg) {
 		case RTC_SECONDS:
 		case RTC_MINUTES:
-		     res &= 0x7f;
-		     break;
+			res &= 0x7F;
+			break;
 		case RTC_HOURS:
 		case RTC_DAY_OF_MONTH:
-		     res &= 0x3f;
-		     break;
+			res &= 0x3F;
+			break;
+		case RTC_WEEKDAY:
+			res &= 0x07;
+			break;
 		case RTC_MONTH:
-		     res = (res & 0x1f) - 1;  /* PCF8563 returns month in range 1-12 */
-		     break;
+			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) 
+pcf8563_writereg(int reg, unsigned char val)
 {
-	i2c_writereg(RTC_I2C_WRITE,reg,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_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_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_WARNING "%s: RTC Low Voltage - date/time is not reliable!\n", PCF8563_NAME);
+		printk(KERN_WARNING "%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_mon &= 0x1f;
+	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);
@@ -124,10 +139,14 @@
 pcf8563_init(void)
 {
 	unsigned char ret;
+
+	/* Initiate the i2c protocol. */
+	i2c_init();
+
 	/*
 	 * 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.
+	 * clearing control1, control2 and clk freq and resetting
+	 * all alarms.
 	 */
 	if (rtc_write(RTC_CONTROL1, 0x00) < 0)
 		goto err;
@@ -138,37 +157,35 @@
 	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)
+	if (rtc_write(RTC_TIMER_CONTROL, 0x03) < 0)
 		goto err;
-		
+
 	/* Reset the alarms. */
-	if (rtc_write(RTC_MINUTE_ALARM, 0x00) < 0)
+	if (rtc_write(RTC_MINUTE_ALARM, 0x80) < 0)
 		goto err;
-	
-	if (rtc_write(RTC_HOUR_ALARM, 0x00) < 0)
+
+	if (rtc_write(RTC_HOUR_ALARM, 0x80) < 0)
 		goto err;
-	
-	if (rtc_write(RTC_DAY_ALARM, 0x00) < 0)
+
+	if (rtc_write(RTC_DAY_ALARM, 0x80) < 0)
 		goto err;
-	
-	if (rtc_write(RTC_WEEKDAY_ALARM, 0x00) < 0)
+
+	if (rtc_write(RTC_WEEKDAY_ALARM, 0x80) < 0)
 		goto err;
 
 	if (register_chrdev(PCF8563_MAJOR, DEVICE_NAME, &pcf8563_fops) < 0) {
-		printk(KERN_INFO "%s: Unable to get major numer %d for RTC device.\n", 
+		printk(KERN_INFO "%s: Unable to get major numer %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 (rtc_read(RTC_SECONDS) & 0x80)
-		printk(KERN_WARNING "%s: RTC Low Voltage - date/time is not reliable!\n", PCF8563_NAME);
-	
+		printk(KERN_WARNING "%s: RTC Voltage Low - reliable date/time "
+		       "information is no longer guaranteed!\n", PCF8563_NAME);
+
 	return 0;
 
 err:
@@ -200,75 +217,113 @@
 
 	switch (cmd) {
 		case RTC_RD_TIME:
-			{
-				struct rtc_time tm;
+		{
+			struct rtc_time tm;
 
-				get_rtc_time(&tm);
+			get_rtc_time(&tm);
 
-				if (copy_to_user((struct rtc_time *) arg, &tm, sizeof(struct rtc_time))) {
-					return -EFAULT;
-				}
-
-				return 0;
+			if (copy_to_user((struct rtc_time *) arg, &tm, sizeof tm)) {
+				return -EFAULT;
 			}
-			break;
-		case RTC_SET_TIME:
-			{
-				int leap;
-				int century;
-				unsigned long flags;
-				struct rtc_time tm;
-
-				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;
-				
-				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);
 
-				return 0;
+			return 0;
+		}
+
+		case RTC_SET_TIME:
+		{
+#ifdef CONFIG_ETRAX_RTC_READONLY
+			return -EPERM;
+#else
+			int leap;
+			int year;
+			int century;
+			struct rtc_time 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_mday);
+			BIN_TO_BCD(tm.tm_hour);
+			BIN_TO_BCD(tm.tm_min);
+			BIN_TO_BCD(tm.tm_sec);
+			tm.tm_mon |= century;
+
+			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);
+
+			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);
 			}
-			break;
+			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 -ENOTTY;
 	}
 
 	return 0;
 }
 
-int 
+int
 pcf8563_open(struct inode *inode, struct file *filp)
 {
 	MOD_INC_USE_COUNT;