[deliverable/linux.git] / drivers / rtc / rtc-parisc.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;
	int 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");
Commit	Line	Data
9eb16864 KM	1	/* rtc-parisc: RTC for HP PA-RISC firmware
	2	*
	3	* Copyright (C) 2008 Kyle McMartin <kyle@mcmartin.ca>
	4	*/
	5
	6	#include <linux/kernel.h>
	7	#include <linux/module.h>
	8	#include <linux/time.h>
	9	#include <linux/platform_device.h>
	10
	11	#include <asm/rtc.h>
	12
	13	/* as simple as can be, and no simpler. */
	14	struct parisc_rtc {
	15	struct rtc_device *rtc;
	16	spinlock_t lock;
	17	};
	18
	19	static int parisc_get_time(struct device dev, struct rtc_time tm)
	20	{
	21	struct parisc_rtc *p = dev_get_drvdata(dev);
	22	unsigned long flags, ret;
	23
	24	spin_lock_irqsave(&p->lock, flags);
	25	ret = get_rtc_time(tm);
	26	spin_unlock_irqrestore(&p->lock, flags);
	27
	28	if (ret & RTC_BATT_BAD)
	29	return -EOPNOTSUPP;
	30
	31	return 0;
	32	}
	33
	34	static int parisc_set_time(struct device dev, struct rtc_time tm)
	35	{
	36	struct parisc_rtc *p = dev_get_drvdata(dev);
022b7690 RK	37	unsigned long flags;
022b7690 RK	38	int ret;
9eb16864 KM	39
	40	spin_lock_irqsave(&p->lock, flags);
	41	ret = set_rtc_time(tm);
	42	spin_unlock_irqrestore(&p->lock, flags);
	43
	44	if (ret < 0)
	45	return -EOPNOTSUPP;
	46
	47	return 0;
	48	}
	49
	50	static const struct rtc_class_ops parisc_rtc_ops = {
	51	.read_time = parisc_get_time,
	52	.set_time = parisc_set_time,
	53	};
	54
	55	static int __devinit parisc_rtc_probe(struct platform_device *dev)
	56	{
	57	struct parisc_rtc *p;
	58
	59	p = kzalloc(sizeof (*p), GFP_KERNEL);
	60	if (!p)
	61	return -ENOMEM;
	62
	63	spin_lock_init(&p->lock);
	64
	65	p->rtc = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops,
	66	THIS_MODULE);
	67	if (IS_ERR(p->rtc)) {
	68	int err = PTR_ERR(p->rtc);
	69	kfree(p);
	70	return err;
	71	}
	72
	73	platform_set_drvdata(dev, p);
	74
	75	return 0;
	76	}
	77
	78	static int __devexit parisc_rtc_remove(struct platform_device *dev)
	79	{
	80	struct parisc_rtc *p = platform_get_drvdata(dev);
	81
	82	rtc_device_unregister(p->rtc);
	83	kfree(p);
	84
	85	return 0;
	86	}
	87
	88	static struct platform_driver parisc_rtc_driver = {
	89	.driver = {
	90	.name = "rtc-parisc",
	91	.owner = THIS_MODULE,
	92	},
	93	.probe = parisc_rtc_probe,
	94	.remove = __devexit_p(parisc_rtc_remove),
	95	};
	96
	97	static int __init parisc_rtc_init(void)
	98	{
	99	return platform_driver_register(&parisc_rtc_driver);
	100	}
	101
	102	static void __exit parisc_rtc_fini(void)
103	{
104	platform_driver_unregister(&parisc_rtc_driver);
105	}
106
107	module_init(parisc_rtc_init);
108	module_exit(parisc_rtc_fini);
109
110	MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
111	MODULE_LICENSE("GPL");
112	MODULE_DESCRIPTION("HP PA-RISC RTC driver");