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