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/* 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");
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