1 files changed, 39 insertions, 28 deletions

diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index 6273a3d240a2..17633bfa8480 100644
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -6,6 +6,10 @@
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
+ *
+ * Copyright (C) 2006 Torsten Ertbjerg Rasmussen <tr@newtec.dk>
+ *  - nvram size determined from resource
+ *  - this ds1742 driver now supports ds1743.
  */
 
 #include <linux/bcd.h>
@@ -17,20 +21,19 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 
-#define DRV_VERSION "0.2"
+#define DRV_VERSION "0.3"
 
-#define RTC_REG_SIZE            0x800
-#define RTC_OFFSET              0x7f8
+#define RTC_SIZE                8
 
-#define RTC_CONTROL             (RTC_OFFSET + 0)
-#define RTC_CENTURY             (RTC_OFFSET + 0)
-#define RTC_SECONDS             (RTC_OFFSET + 1)
-#define RTC_MINUTES             (RTC_OFFSET + 2)
-#define RTC_HOURS               (RTC_OFFSET + 3)
-#define RTC_DAY                 (RTC_OFFSET + 4)
-#define RTC_DATE                (RTC_OFFSET + 5)
-#define RTC_MONTH               (RTC_OFFSET + 6)
-#define RTC_YEAR                (RTC_OFFSET + 7)
+#define RTC_CONTROL             0
+#define RTC_CENTURY             0
+#define RTC_SECONDS             1
+#define RTC_MINUTES             2
+#define RTC_HOURS               3
+#define RTC_DAY                 4
+#define RTC_DATE                5
+#define RTC_MONTH               6
+#define RTC_YEAR                7
 
 #define RTC_CENTURY_MASK        0x3f
 #define RTC_SECONDS_MASK        0x7f
@@ -48,7 +51,10 @@
 
 struct rtc_plat_data {
         struct rtc_device *rtc;
-        void __iomem *ioaddr;
+        void __iomem *ioaddr_nvram;
+        void __iomem *ioaddr_rtc;
+        size_t size_nvram;
+        size_t size;
         unsigned long baseaddr;
         unsigned long last_jiffies;
 };
@@ -57,7 +63,7 @@ static int ds1742_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
         struct platform_device *pdev = to_platform_device(dev);
         struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
-        void __iomem *ioaddr = pdata->ioaddr;
+        void __iomem *ioaddr = pdata->ioaddr_rtc;
         u8 century;
 
         century = BIN2BCD((tm->tm_year + 1900) / 100);
@@ -82,7 +88,7 @@ static int ds1742_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
         struct platform_device *pdev = to_platform_device(dev);
         struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
-        void __iomem *ioaddr = pdata->ioaddr;
+        void __iomem *ioaddr = pdata->ioaddr_rtc;
         unsigned int year, month, day, hour, minute, second, week;
         unsigned int century;
 
@@ -127,10 +133,10 @@ static ssize_t ds1742_nvram_read(struct kobject *kobj, char *buf,
         struct platform_device *pdev =
                 to_platform_device(container_of(kobj, struct device, kobj));
         struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
-        void __iomem *ioaddr = pdata->ioaddr;
+        void __iomem *ioaddr = pdata->ioaddr_nvram;
         ssize_t count;
 
-        for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
+        for (count = 0; size > 0 && pos < pdata->size_nvram; count++, size--)
                 *buf++ = readb(ioaddr + pos++);
         return count;
 }
@@ -141,10 +147,10 @@ static ssize_t ds1742_nvram_write(struct kobject *kobj, char *buf,
         struct platform_device *pdev =
                 to_platform_device(container_of(kobj, struct device, kobj));
         struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
-        void __iomem *ioaddr = pdata->ioaddr;
+        void __iomem *ioaddr = pdata->ioaddr_nvram;
         ssize_t count;
 
-        for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
+        for (count = 0; size > 0 && pos < pdata->size_nvram; count++, size--)
                 writeb(*buf++, ioaddr + pos++);
         return count;
 }
@@ -155,7 +161,6 @@ static struct bin_attribute ds1742_nvram_attr = {
                 .mode = S_IRUGO | S_IWUGO,
                 .owner = THIS_MODULE,
         },
-        .size = RTC_OFFSET,
         .read = ds1742_nvram_read,
         .write = ds1742_nvram_write,
 };
@@ -175,19 +180,23 @@ static int __init ds1742_rtc_probe(struct platform_device *pdev)
         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
         if (!pdata)
                 return -ENOMEM;
-        if (!request_mem_region(res->start, RTC_REG_SIZE, pdev->name)) {
+        pdata->size = res->end - res->start + 1;
+        if (!request_mem_region(res->start, pdata->size, pdev->name)) {
                 ret = -EBUSY;
                 goto out;
         }
         pdata->baseaddr = res->start;
-        ioaddr = ioremap(pdata->baseaddr, RTC_REG_SIZE);
+        ioaddr = ioremap(pdata->baseaddr, pdata->size);
         if (!ioaddr) {
                 ret = -ENOMEM;
                 goto out;
         }
-        pdata->ioaddr = ioaddr;
+        pdata->ioaddr_nvram = ioaddr;
+        pdata->size_nvram = pdata->size - RTC_SIZE;
+        pdata->ioaddr_rtc = ioaddr + pdata->size_nvram;
 
         /* turn RTC on if it was not on */
+        ioaddr = pdata->ioaddr_rtc;
         sec = readb(ioaddr + RTC_SECONDS);
         if (sec & RTC_STOP) {
                 sec &= RTC_SECONDS_MASK;
@@ -208,6 +217,8 @@ static int __init ds1742_rtc_probe(struct platform_device *pdev)
         pdata->rtc = rtc;
         pdata->last_jiffies = jiffies;
         platform_set_drvdata(pdev, pdata);
+        ds1742_nvram_attr.size = max(ds1742_nvram_attr.size,
+                                     pdata->size_nvram);
         ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1742_nvram_attr);
         if (ret)
                 goto out;
@@ -215,10 +226,10 @@ static int __init ds1742_rtc_probe(struct platform_device *pdev)
  out:
         if (pdata->rtc)
                 rtc_device_unregister(pdata->rtc);
-        if (ioaddr)
-                iounmap(ioaddr);
+        if (pdata->ioaddr_nvram)
+                iounmap(pdata->ioaddr_nvram);
         if (pdata->baseaddr)
-                release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
+                release_mem_region(pdata->baseaddr, pdata->size);
         kfree(pdata);
         return ret;
 }
@@ -229,8 +240,8 @@ static int __devexit ds1742_rtc_remove(struct platform_device *pdev)
 
         sysfs_remove_bin_file(&pdev->dev.kobj, &ds1742_nvram_attr);
         rtc_device_unregister(pdata->rtc);
-        iounmap(pdata->ioaddr);
-        release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
+        iounmap(pdata->ioaddr_nvram);
+        release_mem_region(pdata->baseaddr, pdata->size);
         kfree(pdata);
         return 0;
 }