[linux.git] / drivers / rtc / rtc-bq4802.c

/* rtc-bq4802.c: TI BQ4802 RTC driver.
 *
 * Copyright (C) 2008 David S. Miller <[email protected]>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/slab.h>

MODULE_AUTHOR("David S. Miller <[email protected]>");
MODULE_DESCRIPTION("TI BQ4802 RTC driver");
MODULE_LICENSE("GPL");

struct bq4802 {
	void __iomem		*regs;
	unsigned long		ioport;
	struct rtc_device	*rtc;
	spinlock_t		lock;
	struct resource		*r;
	u8 (*read)(struct bq4802 *, int);
	void (*write)(struct bq4802 *, int, u8);
};

static u8 bq4802_read_io(struct bq4802 *p, int off)
{
	return inb(p->ioport + off);
}

static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
{
	outb(val, p->ioport + off);
}

static u8 bq4802_read_mem(struct bq4802 *p, int off)
{
	return readb(p->regs + off);
}

static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
{
	writeb(val, p->regs + off);
}

static int bq4802_read_time(struct device *dev, struct rtc_time *tm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct bq4802 *p = platform_get_drvdata(pdev);
	unsigned long flags;
	unsigned int century;
	u8 val;

	spin_lock_irqsave(&p->lock, flags);

	val = p->read(p, 0x0e);
	p->write(p, 0xe, val | 0x08);

	tm->tm_sec = p->read(p, 0x00);
	tm->tm_min = p->read(p, 0x02);
	tm->tm_hour = p->read(p, 0x04);
	tm->tm_mday = p->read(p, 0x06);
	tm->tm_mon = p->read(p, 0x09);
	tm->tm_year = p->read(p, 0x0a);
	tm->tm_wday = p->read(p, 0x08);
	century = p->read(p, 0x0f);

	p->write(p, 0x0e, val);

	spin_unlock_irqrestore(&p->lock, flags);

	tm->tm_sec = bcd2bin(tm->tm_sec);
	tm->tm_min = bcd2bin(tm->tm_min);
	tm->tm_hour = bcd2bin(tm->tm_hour);
	tm->tm_mday = bcd2bin(tm->tm_mday);
	tm->tm_mon = bcd2bin(tm->tm_mon);
	tm->tm_year = bcd2bin(tm->tm_year);
	tm->tm_wday = bcd2bin(tm->tm_wday);
	century = bcd2bin(century);

	tm->tm_year += (century * 100);
	tm->tm_year -= 1900;

	tm->tm_mon--;

	return 0;
}

static int bq4802_set_time(struct device *dev, struct rtc_time *tm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct bq4802 *p = platform_get_drvdata(pdev);
	u8 sec, min, hrs, day, mon, yrs, century, val;
	unsigned long flags;
	unsigned int year;

	year = tm->tm_year + 1900;
	century = year / 100;
	yrs = year % 100;

	mon = tm->tm_mon + 1;   /* tm_mon starts at zero */
	day = tm->tm_mday;
	hrs = tm->tm_hour;
	min = tm->tm_min;
	sec = tm->tm_sec;

	sec = bin2bcd(sec);
	min = bin2bcd(min);
	hrs = bin2bcd(hrs);
	day = bin2bcd(day);
	mon = bin2bcd(mon);
	yrs = bin2bcd(yrs);
	century = bin2bcd(century);

	spin_lock_irqsave(&p->lock, flags);

	val = p->read(p, 0x0e);
	p->write(p, 0x0e, val | 0x08);

	p->write(p, 0x00, sec);
	p->write(p, 0x02, min);
	p->write(p, 0x04, hrs);
	p->write(p, 0x06, day);
	p->write(p, 0x09, mon);
	p->write(p, 0x0a, yrs);
	p->write(p, 0x0f, century);

	p->write(p, 0x0e, val);

	spin_unlock_irqrestore(&p->lock, flags);

	return 0;
}

static const struct rtc_class_ops bq4802_ops = {
	.read_time	= bq4802_read_time,
	.set_time	= bq4802_set_time,
};

static int __devinit bq4802_probe(struct platform_device *pdev)
{
	struct bq4802 *p = kzalloc(sizeof(*p), GFP_KERNEL);
	int err = -ENOMEM;

	if (!p)
		goto out;

	spin_lock_init(&p->lock);

	p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!p->r) {
		p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
		err = -EINVAL;
		if (!p->r)
			goto out_free;
	}
	if (p->r->flags & IORESOURCE_IO) {
		p->ioport = p->r->start;
		p->read = bq4802_read_io;
		p->write = bq4802_write_io;
	} else if (p->r->flags & IORESOURCE_MEM) {
		p->regs = ioremap(p->r->start, resource_size(p->r));
		p->read = bq4802_read_mem;
		p->write = bq4802_write_mem;
	} else {
		err = -EINVAL;
		goto out_free;
	}

	platform_set_drvdata(pdev, p);

	p->rtc = rtc_device_register("bq4802", &pdev->dev,
				     &bq4802_ops, THIS_MODULE);
	if (IS_ERR(p->rtc)) {
		err = PTR_ERR(p->rtc);
		goto out_iounmap;
	}

	err = 0;
out:
	return err;

out_iounmap:
	if (p->r->flags & IORESOURCE_MEM)
		iounmap(p->regs);
out_free:
	kfree(p);
	goto out;
}

static int __devexit bq4802_remove(struct platform_device *pdev)
{
	struct bq4802 *p = platform_get_drvdata(pdev);

	rtc_device_unregister(p->rtc);
	if (p->r->flags & IORESOURCE_MEM)
		iounmap(p->regs);

	platform_set_drvdata(pdev, NULL);

	kfree(p);

	return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:rtc-bq4802");

static struct platform_driver bq4802_driver = {
	.driver		= {
		.name	= "rtc-bq4802",
		.owner	= THIS_MODULE,
	},
	.probe		= bq4802_probe,
	.remove		= __devexit_p(bq4802_remove),
};

module_platform_driver(bq4802_driver);
Commit	Line	Data
cca4c231 DM	1	/* rtc-bq4802.c: TI BQ4802 RTC driver.
	2	*
	3	* Copyright (C) 2008 David S. Miller <[email protected]>
	4	*/
	5
	6	#include <linux/kernel.h>
	7	#include <linux/module.h>
	8	#include <linux/init.h>
	9	#include <linux/io.h>
	10	#include <linux/platform_device.h>
	11	#include <linux/rtc.h>
	12	#include <linux/bcd.h>
5a0e3ad6	13	#include <linux/slab.h>
cca4c231 DM	14
	15	MODULE_AUTHOR("David S. Miller <[email protected]>");
	16	MODULE_DESCRIPTION("TI BQ4802 RTC driver");
	17	MODULE_LICENSE("GPL");
	18
	19	struct bq4802 {
	20	void __iomem *regs;
503acc8a	21	unsigned long ioport;
cca4c231 DM	22	struct rtc_device *rtc;
	23	spinlock_t lock;
	24	struct resource *r;
	25	u8 (read)(struct bq4802 , int);
	26	void (write)(struct bq4802 , int, u8);
	27	};
	28
	29	static u8 bq4802_read_io(struct bq4802 *p, int off)
	30	{
503acc8a	31	return inb(p->ioport + off);
cca4c231 DM	32	}
	33
	34	static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
	35	{
503acc8a	36	outb(val, p->ioport + off);
cca4c231 DM	37	}
	38
	39	static u8 bq4802_read_mem(struct bq4802 *p, int off)
	40	{
	41	return readb(p->regs + off);
	42	}
	43
	44	static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
	45	{
503acc8a	46	writeb(val, p->regs + off);
cca4c231 DM	47	}
	48
	49	static int bq4802_read_time(struct device dev, struct rtc_time tm)
	50	{
	51	struct platform_device *pdev = to_platform_device(dev);
	52	struct bq4802 *p = platform_get_drvdata(pdev);
	53	unsigned long flags;
	54	unsigned int century;
	55	u8 val;
	56
	57	spin_lock_irqsave(&p->lock, flags);
	58
	59	val = p->read(p, 0x0e);
	60	p->write(p, 0xe, val \| 0x08);
	61
	62	tm->tm_sec = p->read(p, 0x00);
	63	tm->tm_min = p->read(p, 0x02);
	64	tm->tm_hour = p->read(p, 0x04);
	65	tm->tm_mday = p->read(p, 0x06);
	66	tm->tm_mon = p->read(p, 0x09);
	67	tm->tm_year = p->read(p, 0x0a);
	68	tm->tm_wday = p->read(p, 0x08);
	69	century = p->read(p, 0x0f);
	70
	71	p->write(p, 0x0e, val);
	72
	73	spin_unlock_irqrestore(&p->lock, flags);
	74
e232cfdc AM	75	tm->tm_sec = bcd2bin(tm->tm_sec);
	76	tm->tm_min = bcd2bin(tm->tm_min);
	77	tm->tm_hour = bcd2bin(tm->tm_hour);
	78	tm->tm_mday = bcd2bin(tm->tm_mday);
	79	tm->tm_mon = bcd2bin(tm->tm_mon);
	80	tm->tm_year = bcd2bin(tm->tm_year);
	81	tm->tm_wday = bcd2bin(tm->tm_wday);
	82	century = bcd2bin(century);
cca4c231 DM	83
	84	tm->tm_year += (century * 100);
	85	tm->tm_year -= 1900;
	86
	87	tm->tm_mon--;
	88
	89	return 0;
	90	}
	91
	92	static int bq4802_set_time(struct device dev, struct rtc_time tm)
	93	{
	94	struct platform_device *pdev = to_platform_device(dev);
	95	struct bq4802 *p = platform_get_drvdata(pdev);
	96	u8 sec, min, hrs, day, mon, yrs, century, val;
	97	unsigned long flags;
	98	unsigned int year;
	99
	100	year = tm->tm_year + 1900;
	101	century = year / 100;
	102	yrs = year % 100;
	103
	104	mon = tm->tm_mon + 1; /* tm_mon starts at zero */
	105	day = tm->tm_mday;
	106	hrs = tm->tm_hour;
	107	min = tm->tm_min;
	108	sec = tm->tm_sec;
	109
e232cfdc AM	110	sec = bin2bcd(sec);
	111	min = bin2bcd(min);
	112	hrs = bin2bcd(hrs);
	113	day = bin2bcd(day);
	114	mon = bin2bcd(mon);
	115	yrs = bin2bcd(yrs);
	116	century = bin2bcd(century);
cca4c231 DM	117
	118	spin_lock_irqsave(&p->lock, flags);
	119
	120	val = p->read(p, 0x0e);
	121	p->write(p, 0x0e, val \| 0x08);
	122
	123	p->write(p, 0x00, sec);
	124	p->write(p, 0x02, min);
	125	p->write(p, 0x04, hrs);
	126	p->write(p, 0x06, day);
	127	p->write(p, 0x09, mon);
	128	p->write(p, 0x0a, yrs);
	129	p->write(p, 0x0f, century);
	130
	131	p->write(p, 0x0e, val);
	132
	133	spin_unlock_irqrestore(&p->lock, flags);
	134
	135	return 0;
	136	}
	137
	138	static const struct rtc_class_ops bq4802_ops = {
	139	.read_time = bq4802_read_time,
	140	.set_time = bq4802_set_time,
	141	};
	142
	143	static int __devinit bq4802_probe(struct platform_device *pdev)
	144	{
	145	struct bq4802 p = kzalloc(sizeof(p), GFP_KERNEL);
	146	int err = -ENOMEM;
	147
	148	if (!p)
	149	goto out;
	150
	151	spin_lock_init(&p->lock);
	152
	153	p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	154	if (!p->r) {
	155	p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
	156	err = -EINVAL;
	157	if (!p->r)
	158	goto out_free;
	159	}
	160	if (p->r->flags & IORESOURCE_IO) {
503acc8a	161	p->ioport = p->r->start;
cca4c231 DM	162	p->read = bq4802_read_io;
	163	p->write = bq4802_write_io;
	164	} else if (p->r->flags & IORESOURCE_MEM) {
	165	p->regs = ioremap(p->r->start, resource_size(p->r));
	166	p->read = bq4802_read_mem;
	167	p->write = bq4802_write_mem;
	168	} else {
	169	err = -EINVAL;
	170	goto out_free;
	171	}
	172
b74d2caa AZ	173	platform_set_drvdata(pdev, p);
b74d2caa AZ	174
cca4c231 DM	175	p->rtc = rtc_device_register("bq4802", &pdev->dev,
	176	&bq4802_ops, THIS_MODULE);
	177	if (IS_ERR(p->rtc)) {
	178	err = PTR_ERR(p->rtc);
	179	goto out_iounmap;
	180	}
	181
cca4c231 DM	182	err = 0;
	183	out:
	184	return err;
	185
	186	out_iounmap:
	187	if (p->r->flags & IORESOURCE_MEM)
	188	iounmap(p->regs);
	189	out_free:
	190	kfree(p);
	191	goto out;
	192	}
	193
	194	static int __devexit bq4802_remove(struct platform_device *pdev)
	195	{
	196	struct bq4802 *p = platform_get_drvdata(pdev);
	197
	198	rtc_device_unregister(p->rtc);
	199	if (p->r->flags & IORESOURCE_MEM)
	200	iounmap(p->regs);
	201
	202	platform_set_drvdata(pdev, NULL);
	203
	204	kfree(p);
	205
	206	return 0;
	207	}
	208
	209	/* work with hotplug and coldplug */
	210	MODULE_ALIAS("platform:rtc-bq4802");
	211
	212	static struct platform_driver bq4802_driver = {
	213	.driver = {
	214	.name = "rtc-bq4802",
	215	.owner = THIS_MODULE,
	216	},
	217	.probe = bq4802_probe,
	218	.remove = __devexit_p(bq4802_remove),
	219	};
	220
0c4eae66	221	module_platform_driver(bq4802_driver);