mirror of https://gitee.com/openkylin/linux.git
112 lines
2.2 KiB
C
112 lines
2.2 KiB
C
/* rtc-parisc: RTC for HP PA-RISC firmware
|
|
*
|
|
* Copyright (C) 2008 Kyle McMartin <kyle@mcmartin.ca>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/time.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <asm/rtc.h>
|
|
|
|
/* as simple as can be, and no simpler. */
|
|
struct parisc_rtc {
|
|
struct rtc_device *rtc;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
static int parisc_get_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct parisc_rtc *p = dev_get_drvdata(dev);
|
|
unsigned long flags, ret;
|
|
|
|
spin_lock_irqsave(&p->lock, flags);
|
|
ret = get_rtc_time(tm);
|
|
spin_unlock_irqrestore(&p->lock, flags);
|
|
|
|
if (ret & RTC_BATT_BAD)
|
|
return -EOPNOTSUPP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parisc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct parisc_rtc *p = dev_get_drvdata(dev);
|
|
unsigned long flags, ret;
|
|
|
|
spin_lock_irqsave(&p->lock, flags);
|
|
ret = set_rtc_time(tm);
|
|
spin_unlock_irqrestore(&p->lock, flags);
|
|
|
|
if (ret < 0)
|
|
return -EOPNOTSUPP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_class_ops parisc_rtc_ops = {
|
|
.read_time = parisc_get_time,
|
|
.set_time = parisc_set_time,
|
|
};
|
|
|
|
static int __devinit parisc_rtc_probe(struct platform_device *dev)
|
|
{
|
|
struct parisc_rtc *p;
|
|
|
|
p = kzalloc(sizeof (*p), GFP_KERNEL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&p->lock);
|
|
|
|
p->rtc = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops,
|
|
THIS_MODULE);
|
|
if (IS_ERR(p->rtc)) {
|
|
int err = PTR_ERR(p->rtc);
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
|
|
platform_set_drvdata(dev, p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit parisc_rtc_remove(struct platform_device *dev)
|
|
{
|
|
struct parisc_rtc *p = platform_get_drvdata(dev);
|
|
|
|
rtc_device_unregister(p->rtc);
|
|
kfree(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver parisc_rtc_driver = {
|
|
.driver = {
|
|
.name = "rtc-parisc",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = parisc_rtc_probe,
|
|
.remove = __devexit_p(parisc_rtc_remove),
|
|
};
|
|
|
|
static int __init parisc_rtc_init(void)
|
|
{
|
|
return platform_driver_register(&parisc_rtc_driver);
|
|
}
|
|
|
|
static void __exit parisc_rtc_fini(void)
|
|
{
|
|
platform_driver_unregister(&parisc_rtc_driver);
|
|
}
|
|
|
|
module_init(parisc_rtc_init);
|
|
module_exit(parisc_rtc_fini);
|
|
|
|
MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("HP PA-RISC RTC driver");
|