[linux-2.6-block.git] / drivers / rtc / rtc-bq4802.c

/* rtc-bq4802.c: TI BQ4802 RTC driver.
 *
 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
 */

#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>

MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
MODULE_DESCRIPTION("TI BQ4802 RTC driver");
MODULE_LICENSE("GPL");

struct bq4802 {
	void __iomem		*regs;
	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->regs + off);
}

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

	BCD_TO_BIN(tm->tm_sec);
	BCD_TO_BIN(tm->tm_min);
	BCD_TO_BIN(tm->tm_hour);
	BCD_TO_BIN(tm->tm_mday);
	BCD_TO_BIN(tm->tm_mon);
	BCD_TO_BIN(tm->tm_year);
	BCD_TO_BIN(tm->tm_wday);
	BCD_TO_BIN(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;

	BIN_TO_BCD(sec);
	BIN_TO_BCD(min);
	BIN_TO_BCD(hrs);
	BIN_TO_BCD(day);
	BIN_TO_BCD(mon);
	BIN_TO_BCD(yrs);
	BIN_TO_BCD(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->regs = (void __iomem *) 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;
	}

	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;
	}

	platform_set_drvdata(pdev, p);
	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),
};

static int __init bq4802_init(void)
{
	return platform_driver_register(&bq4802_driver);
}

static void __exit bq4802_exit(void)
{
	platform_driver_unregister(&bq4802_driver);
}

module_init(bq4802_init);
module_exit(bq4802_exit);
Commit	Line	Data
cca4c231 DM	1	/* rtc-bq4802.c: TI BQ4802 RTC driver.
	2	*
	3	* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
	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>
	13
	14	MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
	15	MODULE_DESCRIPTION("TI BQ4802 RTC driver");
	16	MODULE_LICENSE("GPL");
	17
	18	struct bq4802 {
	19	void __iomem *regs;
	20	struct rtc_device *rtc;
	21	spinlock_t lock;
	22	struct resource *r;
	23	u8 (read)(struct bq4802 , int);
	24	void (write)(struct bq4802 , int, u8);
	25	};
	26
	27	static u8 bq4802_read_io(struct bq4802 *p, int off)
	28	{
	29	return inb(p->regs + off);
	30	}
	31
	32	static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
	33	{
	34	return outb(val, p->regs + off);
	35	}
	36
	37	static u8 bq4802_read_mem(struct bq4802 *p, int off)
	38	{
	39	return readb(p->regs + off);
	40	}
	41
	42	static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
	43	{
	44	return writeb(val, p->regs + off);
	45	}
	46
	47	static int bq4802_read_time(struct device dev, struct rtc_time tm)
	48	{
	49	struct platform_device *pdev = to_platform_device(dev);
	50	struct bq4802 *p = platform_get_drvdata(pdev);
	51	unsigned long flags;
	52	unsigned int century;
	53	u8 val;
	54
	55	spin_lock_irqsave(&p->lock, flags);
	56
	57	val = p->read(p, 0x0e);
	58	p->write(p, 0xe, val \| 0x08);
	59
	60	tm->tm_sec = p->read(p, 0x00);
	61	tm->tm_min = p->read(p, 0x02);
	62	tm->tm_hour = p->read(p, 0x04);
	63	tm->tm_mday = p->read(p, 0x06);
	64	tm->tm_mon = p->read(p, 0x09);
65	tm->tm_year = p->read(p, 0x0a);
66	tm->tm_wday = p->read(p, 0x08);
67	century = p->read(p, 0x0f);
68
69	p->write(p, 0x0e, val);
70
71	spin_unlock_irqrestore(&p->lock, flags);
72
73	BCD_TO_BIN(tm->tm_sec);
74	BCD_TO_BIN(tm->tm_min);
75	BCD_TO_BIN(tm->tm_hour);
76	BCD_TO_BIN(tm->tm_mday);
77	BCD_TO_BIN(tm->tm_mon);
78	BCD_TO_BIN(tm->tm_year);
79	BCD_TO_BIN(tm->tm_wday);
80	BCD_TO_BIN(century);
81
82	tm->tm_year += (century * 100);
83	tm->tm_year -= 1900;
84
85	tm->tm_mon--;
86
87	return 0;
88	}
89
90	static int bq4802_set_time(struct device dev, struct rtc_time tm)
91	{
92	struct platform_device *pdev = to_platform_device(dev);
93	struct bq4802 *p = platform_get_drvdata(pdev);
94	u8 sec, min, hrs, day, mon, yrs, century, val;
95	unsigned long flags;
96	unsigned int year;
97
98	year = tm->tm_year + 1900;
99	century = year / 100;
100	yrs = year % 100;
101
102	mon = tm->tm_mon + 1; /* tm_mon starts at zero */
103	day = tm->tm_mday;
104	hrs = tm->tm_hour;
105	min = tm->tm_min;
106	sec = tm->tm_sec;
107
108	BIN_TO_BCD(sec);
109	BIN_TO_BCD(min);
110	BIN_TO_BCD(hrs);
111	BIN_TO_BCD(day);
112	BIN_TO_BCD(mon);
113	BIN_TO_BCD(yrs);
114	BIN_TO_BCD(century);
115
116	spin_lock_irqsave(&p->lock, flags);
117
118	val = p->read(p, 0x0e);
119	p->write(p, 0x0e, val \| 0x08);
120
121	p->write(p, 0x00, sec);
122	p->write(p, 0x02, min);
123	p->write(p, 0x04, hrs);
124	p->write(p, 0x06, day);
125	p->write(p, 0x09, mon);
126	p->write(p, 0x0a, yrs);
127	p->write(p, 0x0f, century);
128
129	p->write(p, 0x0e, val);
130
131	spin_unlock_irqrestore(&p->lock, flags);
132
133	return 0;
134	}
135
136	static const struct rtc_class_ops bq4802_ops = {
137	.read_time = bq4802_read_time,
138	.set_time = bq4802_set_time,
139	};
140
141	static int __devinit bq4802_probe(struct platform_device *pdev)
142	{
143	struct bq4802 p = kzalloc(sizeof(p), GFP_KERNEL);
144	int err = -ENOMEM;
145
146	if (!p)
147	goto out;
148
149	spin_lock_init(&p->lock);
150
151	p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
152	if (!p->r) {
153	p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
154	err = -EINVAL;
155	if (!p->r)
156	goto out_free;
157	}
158	if (p->r->flags & IORESOURCE_IO) {
159	p->regs = (void __iomem *) p->r->start;
160	p->read = bq4802_read_io;
161	p->write = bq4802_write_io;
162	} else if (p->r->flags & IORESOURCE_MEM) {
163	p->regs = ioremap(p->r->start, resource_size(p->r));
164	p->read = bq4802_read_mem;
165	p->write = bq4802_write_mem;
166	} else {
167	err = -EINVAL;
168	goto out_free;
169	}
170
171	p->rtc = rtc_device_register("bq4802", &pdev->dev,
172	&bq4802_ops, THIS_MODULE);
173	if (IS_ERR(p->rtc)) {
174	err = PTR_ERR(p->rtc);
175	goto out_iounmap;
176	}
177
178	platform_set_drvdata(pdev, p);
179	err = 0;
180	out:
181	return err;
182
183	out_iounmap:
184	if (p->r->flags & IORESOURCE_MEM)
185	iounmap(p->regs);
186	out_free:
187	kfree(p);
188	goto out;
189	}
190
191	static int __devexit bq4802_remove(struct platform_device *pdev)
192	{
193	struct bq4802 *p = platform_get_drvdata(pdev);
194
195	rtc_device_unregister(p->rtc);
196	if (p->r->flags & IORESOURCE_MEM)
197	iounmap(p->regs);
198
199	platform_set_drvdata(pdev, NULL);
200
201	kfree(p);
202
203	return 0;
204	}
205
206	/* work with hotplug and coldplug */
207	MODULE_ALIAS("platform:rtc-bq4802");
208
209	static struct platform_driver bq4802_driver = {
210	.driver = {
211	.name = "rtc-bq4802",
212	.owner = THIS_MODULE,
213	},
214	.probe = bq4802_probe,
215	.remove = __devexit_p(bq4802_remove),
216	};
217
218	static int __init bq4802_init(void)
219	{
220	return platform_driver_register(&bq4802_driver);
221	}
222
223	static void __exit bq4802_exit(void)
224	{
225	platform_driver_unregister(&bq4802_driver);
226	}
227
228	module_init(bq4802_init);
229	module_exit(bq4802_exit);