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path: root/drivers/rtc/rtc-ds1742.c
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Diffstat (limited to 'drivers/rtc/rtc-ds1742.c')
-rw-r--r--drivers/rtc/rtc-ds1742.c217
1 files changed, 101 insertions, 116 deletions
diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index 8e47e5a06d2..c6b2191a412 100644
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -6,31 +6,37 @@
* 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>
-#include <linux/init.h>
#include <linux/kernel.h>
+#include <linux/gfp.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/rtc.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
+#include <linux/module.h>
-#define DRV_VERSION "0.1"
+#define DRV_VERSION "0.4"
-#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
@@ -47,30 +53,31 @@
#define RTC_BATT_FLAG 0x80
struct rtc_plat_data {
- struct rtc_device *rtc;
- void __iomem *ioaddr;
- unsigned long baseaddr;
+ void __iomem *ioaddr_nvram;
+ void __iomem *ioaddr_rtc;
+ size_t size_nvram;
unsigned long last_jiffies;
+ struct bin_attribute nvram_attr;
};
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);
+ century = bin2bcd((tm->tm_year + 1900) / 100);
writeb(RTC_WRITE, ioaddr + RTC_CONTROL);
- writeb(BIN2BCD(tm->tm_year % 100), ioaddr + RTC_YEAR);
- writeb(BIN2BCD(tm->tm_mon + 1), ioaddr + RTC_MONTH);
- writeb(BIN2BCD(tm->tm_wday) & RTC_DAY_MASK, ioaddr + RTC_DAY);
- writeb(BIN2BCD(tm->tm_mday), ioaddr + RTC_DATE);
- writeb(BIN2BCD(tm->tm_hour), ioaddr + RTC_HOURS);
- writeb(BIN2BCD(tm->tm_min), ioaddr + RTC_MINUTES);
- writeb(BIN2BCD(tm->tm_sec) & RTC_SECONDS_MASK, ioaddr + RTC_SECONDS);
+ writeb(bin2bcd(tm->tm_year % 100), ioaddr + RTC_YEAR);
+ writeb(bin2bcd(tm->tm_mon + 1), ioaddr + RTC_MONTH);
+ writeb(bin2bcd(tm->tm_wday) & RTC_DAY_MASK, ioaddr + RTC_DAY);
+ writeb(bin2bcd(tm->tm_mday), ioaddr + RTC_DATE);
+ writeb(bin2bcd(tm->tm_hour), ioaddr + RTC_HOURS);
+ writeb(bin2bcd(tm->tm_min), ioaddr + RTC_MINUTES);
+ writeb(bin2bcd(tm->tm_sec) & RTC_SECONDS_MASK, ioaddr + RTC_SECONDS);
/* RTC_CENTURY and RTC_CONTROL share same register */
writeb(RTC_WRITE | (century & RTC_CENTURY_MASK), ioaddr + RTC_CENTURY);
@@ -82,7 +89,7 @@ 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;
@@ -100,94 +107,84 @@ static int ds1742_rtc_read_time(struct device *dev, struct rtc_time *tm)
year = readb(ioaddr + RTC_YEAR);
century = readb(ioaddr + RTC_CENTURY) & RTC_CENTURY_MASK;
writeb(0, ioaddr + RTC_CONTROL);
- tm->tm_sec = BCD2BIN(second);
- tm->tm_min = BCD2BIN(minute);
- tm->tm_hour = BCD2BIN(hour);
- tm->tm_mday = BCD2BIN(day);
- tm->tm_wday = BCD2BIN(week);
- tm->tm_mon = BCD2BIN(month) - 1;
+ tm->tm_sec = bcd2bin(second);
+ tm->tm_min = bcd2bin(minute);
+ tm->tm_hour = bcd2bin(hour);
+ tm->tm_mday = bcd2bin(day);
+ tm->tm_wday = bcd2bin(week);
+ tm->tm_mon = bcd2bin(month) - 1;
/* year is 1900 + tm->tm_year */
- tm->tm_year = BCD2BIN(year) + BCD2BIN(century) * 100 - 1900;
+ tm->tm_year = bcd2bin(year) + bcd2bin(century) * 100 - 1900;
- if (rtc_valid_tm(tm) < 0) {
- dev_err(dev, "retrieved date/time is not valid.\n");
- rtc_time_to_tm(0, tm);
- }
- return 0;
+ return rtc_valid_tm(tm);
}
-static struct rtc_class_ops ds1742_rtc_ops = {
+static const struct rtc_class_ops ds1742_rtc_ops = {
.read_time = ds1742_rtc_read_time,
.set_time = ds1742_rtc_set_time,
};
-static ssize_t ds1742_nvram_read(struct kobject *kobj, char *buf,
- loff_t pos, size_t size)
+static ssize_t ds1742_nvram_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t pos, size_t size)
{
- struct platform_device *pdev =
- to_platform_device(container_of(kobj, struct device, kobj));
+ struct device *dev = container_of(kobj, struct device, kobj);
+ 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_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;
}
-static ssize_t ds1742_nvram_write(struct kobject *kobj, char *buf,
- loff_t pos, size_t size)
+static ssize_t ds1742_nvram_write(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t pos, size_t size)
{
- struct platform_device *pdev =
- to_platform_device(container_of(kobj, struct device, kobj));
+ struct device *dev = container_of(kobj, struct device, kobj);
+ 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_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;
}
-static struct bin_attribute ds1742_nvram_attr = {
- .attr = {
- .name = "nvram",
- .mode = S_IRUGO | S_IWUGO,
- .owner = THIS_MODULE,
- },
- .size = RTC_OFFSET,
- .read = ds1742_nvram_read,
- .write = ds1742_nvram_write,
-};
-
-static int __init ds1742_rtc_probe(struct platform_device *pdev)
+static int ds1742_rtc_probe(struct platform_device *pdev)
{
struct rtc_device *rtc;
struct resource *res;
unsigned int cen, sec;
- struct rtc_plat_data *pdata = NULL;
- void __iomem *ioaddr = NULL;
+ struct rtc_plat_data *pdata;
+ void __iomem *ioaddr;
int ret = 0;
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENODEV;
- pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
- if (!request_mem_region(res->start, RTC_REG_SIZE, pdev->name)) {
- ret = -EBUSY;
- goto out;
- }
- pdata->baseaddr = res->start;
- ioaddr = ioremap(pdata->baseaddr, RTC_REG_SIZE);
- if (!ioaddr) {
- ret = -ENOMEM;
- goto out;
- }
- pdata->ioaddr = ioaddr;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ioaddr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(ioaddr))
+ return PTR_ERR(ioaddr);
+
+ pdata->ioaddr_nvram = ioaddr;
+ pdata->size_nvram = resource_size(res) - RTC_SIZE;
+ pdata->ioaddr_rtc = ioaddr + pdata->size_nvram;
+
+ sysfs_bin_attr_init(&pdata->nvram_attr);
+ pdata->nvram_attr.attr.name = "nvram";
+ pdata->nvram_attr.attr.mode = S_IRUGO | S_IWUSR;
+ pdata->nvram_attr.read = ds1742_nvram_read;
+ pdata->nvram_attr.write = ds1742_nvram_write;
+ pdata->nvram_attr.size = 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;
@@ -196,64 +193,52 @@ static int __init ds1742_rtc_probe(struct platform_device *pdev)
writeb(sec, ioaddr + RTC_SECONDS);
writeb(cen & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL);
}
- if (readb(ioaddr + RTC_DAY) & RTC_BATT_FLAG)
+ if (!(readb(ioaddr + RTC_DAY) & RTC_BATT_FLAG))
dev_warn(&pdev->dev, "voltage-low detected.\n");
- rtc = rtc_device_register(pdev->name, &pdev->dev,
- &ds1742_rtc_ops, THIS_MODULE);
- if (IS_ERR(rtc)) {
- ret = PTR_ERR(rtc);
- goto out;
- }
- pdata->rtc = rtc;
pdata->last_jiffies = jiffies;
platform_set_drvdata(pdev, pdata);
- sysfs_create_bin_file(&pdev->dev.kobj, &ds1742_nvram_attr);
+ rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
+ &ds1742_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+
+ ret = sysfs_create_bin_file(&pdev->dev.kobj, &pdata->nvram_attr);
+ if (ret)
+ dev_err(&pdev->dev, "Unable to create sysfs entry: %s\n",
+ pdata->nvram_attr.attr.name);
+
return 0;
- out:
- if (ioaddr)
- iounmap(ioaddr);
- if (pdata->baseaddr)
- release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
- kfree(pdata);
- return ret;
}
-static int __devexit ds1742_rtc_remove(struct platform_device *pdev)
+static int ds1742_rtc_remove(struct platform_device *pdev)
{
struct rtc_plat_data *pdata = platform_get_drvdata(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);
- kfree(pdata);
+ sysfs_remove_bin_file(&pdev->dev.kobj, &pdata->nvram_attr);
return 0;
}
+static const struct of_device_id __maybe_unused ds1742_rtc_of_match[] = {
+ { .compatible = "maxim,ds1742", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ds1742_rtc_of_match);
+
static struct platform_driver ds1742_rtc_driver = {
.probe = ds1742_rtc_probe,
- .remove = __devexit_p(ds1742_rtc_remove),
+ .remove = ds1742_rtc_remove,
.driver = {
- .name = "ds1742",
+ .name = "rtc-ds1742",
.owner = THIS_MODULE,
+ .of_match_table = ds1742_rtc_of_match,
},
};
-static __init int ds1742_init(void)
-{
- return platform_driver_register(&ds1742_rtc_driver);
-}
-
-static __exit void ds1742_exit(void)
-{
- return platform_driver_unregister(&ds1742_rtc_driver);
-}
-
-module_init(ds1742_init);
-module_exit(ds1742_exit);
+module_platform_driver(ds1742_rtc_driver);
MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
MODULE_DESCRIPTION("Dallas DS1742 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:rtc-ds1742");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 11:31:40 +0000