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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.c137
1 files changed, 51 insertions, 86 deletions
diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index 8bc8501bffc..c6b2191a412 100644
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -13,15 +13,18 @@
*/
#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 "0.3"
+#define DRV_VERSION "0.4"
#define RTC_SIZE 8
@@ -50,13 +53,11 @@
#define RTC_BATT_FLAG 0x80
struct rtc_plat_data {
- struct rtc_device *rtc;
void __iomem *ioaddr_nvram;
void __iomem *ioaddr_rtc;
size_t size_nvram;
- size_t size;
- resource_size_t baseaddr;
unsigned long last_jiffies;
+ struct bin_attribute nvram_attr;
};
static int ds1742_rtc_set_time(struct device *dev, struct rtc_time *tm)
@@ -115,11 +116,7 @@ static int ds1742_rtc_read_time(struct device *dev, struct rtc_time *tm)
/* year is 1900 + tm->tm_year */
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 const struct rtc_class_ops ds1742_rtc_ops = {
@@ -127,12 +124,12 @@ static const struct rtc_class_ops ds1742_rtc_ops = {
.set_time = ds1742_rtc_set_time,
};
-static ssize_t ds1742_nvram_read(struct kobject *kobj,
+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_nvram;
ssize_t count;
@@ -142,12 +139,12 @@ static ssize_t ds1742_nvram_read(struct kobject *kobj,
return count;
}
-static ssize_t ds1742_nvram_write(struct kobject *kobj,
+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_nvram;
ssize_t count;
@@ -157,48 +154,35 @@ static ssize_t ds1742_nvram_write(struct kobject *kobj,
return count;
}
-static struct bin_attribute ds1742_nvram_attr = {
- .attr = {
- .name = "nvram",
- .mode = S_IRUGO | S_IWUSR,
- },
- .read = ds1742_nvram_read,
- .write = ds1742_nvram_write,
- /* REVISIT: size in sysfs won't match actual size... if it's
- * not a constant, each RTC should have its own attribute.
- */
-};
-
-static int __devinit 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;
- 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, pdata->size);
- if (!ioaddr) {
- ret = -ENOMEM;
- goto out;
- }
+
+ 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 = pdata->size - RTC_SIZE;
+ 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);
@@ -212,65 +196,46 @@ static int __devinit ds1742_rtc_probe(struct platform_device *pdev)
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);
- ds1742_nvram_attr.size = max(ds1742_nvram_attr.size,
- pdata->size_nvram);
- ret = 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)
- goto out;
+ dev_err(&pdev->dev, "Unable to create sysfs entry: %s\n",
+ pdata->nvram_attr.attr.name);
+
return 0;
- out:
- if (pdata->rtc)
- rtc_device_unregister(pdata->rtc);
- if (pdata->ioaddr_nvram)
- iounmap(pdata->ioaddr_nvram);
- if (pdata->baseaddr)
- release_mem_region(pdata->baseaddr, pdata->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_nvram);
- release_mem_region(pdata->baseaddr, pdata->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 = "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)
-{
- 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");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 15:03:20 +0000