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path: root/drivers/rtc/rtc-stk17ta8.c
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Diffstat (limited to 'drivers/rtc/rtc-stk17ta8.c')
-rw-r--r--drivers/rtc/rtc-stk17ta8.c161
1 files changed, 60 insertions, 101 deletions
diff --git a/drivers/rtc/rtc-stk17ta8.c b/drivers/rtc/rtc-stk17ta8.c
index 7d1547b0070..35ed49ea1f8 100644
--- a/drivers/rtc/rtc-stk17ta8.c
+++ b/drivers/rtc/rtc-stk17ta8.c
@@ -1,7 +1,7 @@
/*
* A RTC driver for the Simtek STK17TA8
*
- * By Thomas Hommel <thomas.hommel@gefanuc.com>
+ * By Thomas Hommel <thomas.hommel@ge.com>
*
* Based on the DS1553 driver from
* Atsushi Nemoto <anemo@mba.ocn.ne.jp>
@@ -14,12 +14,14 @@
#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/interrupt.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/io.h>
+#include <linux/module.h>
#define DRV_VERSION "0.1"
@@ -62,7 +64,6 @@
struct rtc_plat_data {
struct rtc_device *rtc;
void __iomem *ioaddr;
- unsigned long baseaddr;
unsigned long last_jiffies;
int irq;
unsigned int irqen;
@@ -70,6 +71,7 @@ struct rtc_plat_data {
int alrm_min;
int alrm_hour;
int alrm_mday;
+ spinlock_t lock;
};
static int stk17ta8_rtc_set_time(struct device *dev, struct rtc_time *tm)
@@ -142,7 +144,7 @@ static void stk17ta8_rtc_update_alarm(struct rtc_plat_data *pdata)
unsigned long irqflags;
u8 flags;
- spin_lock_irqsave(&pdata->rtc->irq_lock, irqflags);
+ spin_lock_irqsave(&pdata->lock, irqflags);
flags = readb(ioaddr + RTC_FLAGS);
writeb(flags | RTC_WRITE, ioaddr + RTC_FLAGS);
@@ -162,7 +164,7 @@ static void stk17ta8_rtc_update_alarm(struct rtc_plat_data *pdata)
writeb(pdata->irqen ? RTC_INTS_AIE : 0, ioaddr + RTC_INTERRUPTS);
readb(ioaddr + RTC_FLAGS); /* clear interrupts */
writeb(flags & ~RTC_WRITE, ioaddr + RTC_FLAGS);
- spin_unlock_irqrestore(&pdata->rtc->irq_lock, irqflags);
+ spin_unlock_irqrestore(&pdata->lock, irqflags);
}
static int stk17ta8_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
@@ -202,56 +204,52 @@ static irqreturn_t stk17ta8_rtc_interrupt(int irq, void *dev_id)
struct platform_device *pdev = dev_id;
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
void __iomem *ioaddr = pdata->ioaddr;
- unsigned long events = RTC_IRQF;
+ unsigned long events = 0;
+ spin_lock(&pdata->lock);
/* read and clear interrupt */
- if (!(readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_AF))
- return IRQ_NONE;
- if (readb(ioaddr + RTC_SECONDS_ALARM) & 0x80)
- events |= RTC_UF;
- else
- events |= RTC_AF;
- rtc_update_irq(pdata->rtc, 1, events);
- return IRQ_HANDLED;
+ if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_AF) {
+ events = RTC_IRQF;
+ if (readb(ioaddr + RTC_SECONDS_ALARM) & 0x80)
+ events |= RTC_UF;
+ else
+ events |= RTC_AF;
+ rtc_update_irq(pdata->rtc, 1, events);
+ }
+ spin_unlock(&pdata->lock);
+ return events ? IRQ_HANDLED : IRQ_NONE;
}
-static int stk17ta8_rtc_ioctl(struct device *dev, unsigned int cmd,
- unsigned long arg)
+static int stk17ta8_rtc_alarm_irq_enable(struct device *dev,
+ unsigned int enabled)
{
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
if (pdata->irq <= 0)
- return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
- switch (cmd) {
- case RTC_AIE_OFF:
- pdata->irqen &= ~RTC_AF;
- stk17ta8_rtc_update_alarm(pdata);
- break;
- case RTC_AIE_ON:
+ return -EINVAL;
+ if (enabled)
pdata->irqen |= RTC_AF;
- stk17ta8_rtc_update_alarm(pdata);
- break;
- default:
- return -ENOIOCTLCMD;
- }
+ else
+ pdata->irqen &= ~RTC_AF;
+ stk17ta8_rtc_update_alarm(pdata);
return 0;
}
static const struct rtc_class_ops stk17ta8_rtc_ops = {
- .read_time = stk17ta8_rtc_read_time,
- .set_time = stk17ta8_rtc_set_time,
- .read_alarm = stk17ta8_rtc_read_alarm,
- .set_alarm = stk17ta8_rtc_set_alarm,
- .ioctl = stk17ta8_rtc_ioctl,
+ .read_time = stk17ta8_rtc_read_time,
+ .set_time = stk17ta8_rtc_set_time,
+ .read_alarm = stk17ta8_rtc_read_alarm,
+ .set_alarm = stk17ta8_rtc_set_alarm,
+ .alarm_irq_enable = stk17ta8_rtc_alarm_irq_enable,
};
-static ssize_t stk17ta8_nvram_read(struct kobject *kobj,
+static ssize_t stk17ta8_nvram_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *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;
ssize_t count;
@@ -261,12 +259,12 @@ static ssize_t stk17ta8_nvram_read(struct kobject *kobj,
return count;
}
-static ssize_t stk17ta8_nvram_write(struct kobject *kobj,
+static ssize_t stk17ta8_nvram_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *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;
ssize_t count;
@@ -286,33 +284,23 @@ static struct bin_attribute stk17ta8_nvram_attr = {
.write = stk17ta8_nvram_write,
};
-static int __init stk17ta8_rtc_probe(struct platform_device *pdev)
+static int stk17ta8_rtc_probe(struct platform_device *pdev)
{
- struct rtc_device *rtc;
struct resource *res;
unsigned int cal;
unsigned int flags;
struct rtc_plat_data *pdata;
- void __iomem *ioaddr = NULL;
+ 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;
- }
+
+ 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 = ioaddr;
pdata->irq = platform_get_irq(pdev, 0);
@@ -328,55 +316,37 @@ static int __init stk17ta8_rtc_probe(struct platform_device *pdev)
if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_PF)
dev_warn(&pdev->dev, "voltage-low detected.\n");
+ spin_lock_init(&pdata->lock);
+ pdata->last_jiffies = jiffies;
+ platform_set_drvdata(pdev, pdata);
if (pdata->irq > 0) {
writeb(0, ioaddr + RTC_INTERRUPTS);
- if (request_irq(pdata->irq, stk17ta8_rtc_interrupt,
- IRQF_DISABLED | IRQF_SHARED,
+ if (devm_request_irq(&pdev->dev, pdata->irq,
+ stk17ta8_rtc_interrupt,
+ IRQF_SHARED,
pdev->name, pdev) < 0) {
dev_warn(&pdev->dev, "interrupt not available.\n");
pdata->irq = 0;
}
}
- rtc = rtc_device_register(pdev->name, &pdev->dev,
+ pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&stk17ta8_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);
+ if (IS_ERR(pdata->rtc))
+ return PTR_ERR(pdata->rtc);
+
ret = sysfs_create_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
- if (ret)
- goto out;
- return 0;
- out:
- if (pdata->rtc)
- rtc_device_unregister(pdata->rtc);
- if (pdata->irq > 0)
- free_irq(pdata->irq, pdev);
- if (ioaddr)
- iounmap(ioaddr);
- if (pdata->baseaddr)
- release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
- kfree(pdata);
+
return ret;
}
-static int __devexit stk17ta8_rtc_remove(struct platform_device *pdev)
+static int stk17ta8_rtc_remove(struct platform_device *pdev)
{
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
sysfs_remove_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
- rtc_device_unregister(pdata->rtc);
- if (pdata->irq > 0) {
+ if (pdata->irq > 0)
writeb(0, pdata->ioaddr + RTC_INTERRUPTS);
- free_irq(pdata->irq, pdev);
- }
- iounmap(pdata->ioaddr);
- release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
- kfree(pdata);
return 0;
}
@@ -385,27 +355,16 @@ MODULE_ALIAS("platform:stk17ta8");
static struct platform_driver stk17ta8_rtc_driver = {
.probe = stk17ta8_rtc_probe,
- .remove = __devexit_p(stk17ta8_rtc_remove),
+ .remove = stk17ta8_rtc_remove,
.driver = {
.name = "stk17ta8",
.owner = THIS_MODULE,
},
};
-static __init int stk17ta8_init(void)
-{
- return platform_driver_register(&stk17ta8_rtc_driver);
-}
-
-static __exit void stk17ta8_exit(void)
-{
- platform_driver_unregister(&stk17ta8_rtc_driver);
-}
-
-module_init(stk17ta8_init);
-module_exit(stk17ta8_exit);
+module_platform_driver(stk17ta8_rtc_driver);
-MODULE_AUTHOR("Thomas Hommel <thomas.hommel@gefanuc.com>");
+MODULE_AUTHOR("Thomas Hommel <thomas.hommel@ge.com>");
MODULE_DESCRIPTION("Simtek STK17TA8 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 12:51:39 +0000