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

// SPDX-License-Identifier: GPL-2.0-only
/* 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>
#include <linux/slab.h>

MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
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 bq4802 *p = dev_get_drvdata(dev);
	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 bq4802 *p = dev_get_drvdata(dev);
	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 bq4802_probe(struct platform_device *pdev)
{
	struct bq4802 *p = devm_kzalloc(&pdev->dev, 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;
	}
	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 = devm_ioremap(&pdev->dev, p->r->start,
					resource_size(p->r));
		if (!p->regs){
			err = -ENOMEM;
			goto out;
		}
		p->read = bq4802_read_mem;
		p->write = bq4802_write_mem;
	} else {
		err = -EINVAL;
		goto out;
	}

	platform_set_drvdata(pdev, p);

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

	err = 0;
out:
	return err;

}

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

static struct platform_driver bq4802_driver = {
	.driver		= {
		.name	= "rtc-bq4802",
	},
	.probe		= bq4802_probe,
};

module_platform_driver(bq4802_driver);
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
cca4c231 DM	2	/* rtc-bq4802.c: TI BQ4802 RTC driver.
	3	*
	4	* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
	5	*/
	6
	7	#include <linux/kernel.h>
	8	#include <linux/module.h>
	9	#include <linux/init.h>
	10	#include <linux/io.h>
	11	#include <linux/platform_device.h>
	12	#include <linux/rtc.h>
	13	#include <linux/bcd.h>
5a0e3ad6	14	#include <linux/slab.h>
cca4c231 DM	15
	16	MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
	17	MODULE_DESCRIPTION("TI BQ4802 RTC driver");
	18	MODULE_LICENSE("GPL");
	19
	20	struct bq4802 {
	21	void __iomem *regs;
503acc8a	22	unsigned long ioport;
cca4c231 DM	23	struct rtc_device *rtc;
	24	spinlock_t lock;
	25	struct resource *r;
	26	u8 (read)(struct bq4802 , int);
	27	void (write)(struct bq4802 , int, u8);
	28	};
	29
	30	static u8 bq4802_read_io(struct bq4802 *p, int off)
	31	{
503acc8a	32	return inb(p->ioport + off);
cca4c231 DM	33	}
	34
	35	static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
	36	{
503acc8a	37	outb(val, p->ioport + off);
cca4c231 DM	38	}
	39
	40	static u8 bq4802_read_mem(struct bq4802 *p, int off)
	41	{
	42	return readb(p->regs + off);
	43	}
	44
	45	static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
	46	{
503acc8a	47	writeb(val, p->regs + off);
cca4c231 DM	48	}
	49
	50	static int bq4802_read_time(struct device dev, struct rtc_time tm)
	51	{
85368bb9	52	struct bq4802 *p = dev_get_drvdata(dev);
cca4c231 DM	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	{
85368bb9	94	struct bq4802 *p = dev_get_drvdata(dev);
cca4c231 DM	95	u8 sec, min, hrs, day, mon, yrs, century, val;
	96	unsigned long flags;
	97	unsigned int year;
	98
	99	year = tm->tm_year + 1900;
	100	century = year / 100;
	101	yrs = year % 100;
	102
	103	mon = tm->tm_mon + 1; /* tm_mon starts at zero */
	104	day = tm->tm_mday;
	105	hrs = tm->tm_hour;
	106	min = tm->tm_min;
	107	sec = tm->tm_sec;
	108
e232cfdc AM	109	sec = bin2bcd(sec);
	110	min = bin2bcd(min);
	111	hrs = bin2bcd(hrs);
	112	day = bin2bcd(day);
	113	mon = bin2bcd(mon);
	114	yrs = bin2bcd(yrs);
	115	century = bin2bcd(century);
cca4c231 DM	116
	117	spin_lock_irqsave(&p->lock, flags);
	118
	119	val = p->read(p, 0x0e);
	120	p->write(p, 0x0e, val \| 0x08);
	121
	122	p->write(p, 0x00, sec);
	123	p->write(p, 0x02, min);
	124	p->write(p, 0x04, hrs);
	125	p->write(p, 0x06, day);
	126	p->write(p, 0x09, mon);
	127	p->write(p, 0x0a, yrs);
	128	p->write(p, 0x0f, century);
	129
	130	p->write(p, 0x0e, val);
	131
	132	spin_unlock_irqrestore(&p->lock, flags);
	133
	134	return 0;
	135	}
	136
	137	static const struct rtc_class_ops bq4802_ops = {
	138	.read_time = bq4802_read_time,
	139	.set_time = bq4802_set_time,
	140	};
	141
5a167f45	142	static int bq4802_probe(struct platform_device *pdev)
cca4c231	143	{
26c5f7d9	144	struct bq4802 p = devm_kzalloc(&pdev->dev, sizeof(p), GFP_KERNEL);
cca4c231 DM	145	int err = -ENOMEM;
	146
	147	if (!p)
	148	goto out;
	149
	150	spin_lock_init(&p->lock);
	151
	152	p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	153	if (!p->r) {
	154	p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
	155	err = -EINVAL;
	156	if (!p->r)
26c5f7d9	157	goto out;
cca4c231 DM	158	}
cca4c231 DM	159	if (p->r->flags & IORESOURCE_IO) {
503acc8a	160	p->ioport = p->r->start;
cca4c231 DM	161	p->read = bq4802_read_io;
	162	p->write = bq4802_write_io;
	163	} else if (p->r->flags & IORESOURCE_MEM) {
26c5f7d9 JH	164	p->regs = devm_ioremap(&pdev->dev, p->r->start,
26c5f7d9 JH	165	resource_size(p->r));
7874b919 ZJ	166	if (!p->regs){
	167	err = -ENOMEM;
	168	goto out;
	169	}
cca4c231 DM	170	p->read = bq4802_read_mem;
	171	p->write = bq4802_write_mem;
	172	} else {
	173	err = -EINVAL;
26c5f7d9	174	goto out;
cca4c231 DM	175	}
cca4c231 DM	176
b74d2caa AZ	177	platform_set_drvdata(pdev, p);
b74d2caa AZ	178
26c5f7d9 JH	179	p->rtc = devm_rtc_device_register(&pdev->dev, "bq4802",
26c5f7d9 JH	180	&bq4802_ops, THIS_MODULE);
cca4c231 DM	181	if (IS_ERR(p->rtc)) {
cca4c231 DM	182	err = PTR_ERR(p->rtc);
26c5f7d9	183	goto out;
cca4c231 DM	184	}
cca4c231 DM	185
cca4c231 DM	186	err = 0;
	187	out:
	188	return err;
	189
cca4c231 DM	190	}
cca4c231 DM	191
cca4c231 DM	192	/* work with hotplug and coldplug */
	193	MODULE_ALIAS("platform:rtc-bq4802");
	194
	195	static struct platform_driver bq4802_driver = {
	196	.driver = {
	197	.name = "rtc-bq4802",
cca4c231 DM	198	},
cca4c231 DM	199	.probe = bq4802_probe,
cca4c231 DM	200	};
cca4c231 DM	201
0c4eae66	202	module_platform_driver(bq4802_driver);