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

// SPDX-License-Identifier: GPL-2.0
/*
 *  pcap rtc code for Motorola EZX phones
 *
 *  Copyright (c) 2008 guiming zhuo <gmzhuo@gmail.com>
 *  Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com>
 *
 *  Based on Motorola's rtc.c Copyright (c) 2003-2005 Motorola
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mfd/ezx-pcap.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/platform_device.h>

struct pcap_rtc {
	struct pcap_chip *pcap;
	struct rtc_device *rtc;
};

static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc)
{
	struct pcap_rtc *pcap_rtc = _pcap_rtc;
	unsigned long rtc_events;

	if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ))
		rtc_events = RTC_IRQF | RTC_UF;
	else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA))
		rtc_events = RTC_IRQF | RTC_AF;
	else
		rtc_events = 0;

	rtc_update_irq(pcap_rtc->rtc, 1, rtc_events);
	return IRQ_HANDLED;
}

static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
	struct rtc_time *tm = &alrm->time;
	unsigned long secs;
	u32 tod;	/* time of day, seconds since midnight */
	u32 days;	/* days since 1/1/1970 */

	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod);
	secs = tod & PCAP_RTC_TOD_MASK;

	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days);
	secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;

	rtc_time64_to_tm(secs, tm);

	return 0;
}

static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
	unsigned long secs = rtc_tm_to_time64(&alrm->time);
	u32 tod, days;

	tod = secs % SEC_PER_DAY;
	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod);

	days = secs / SEC_PER_DAY;
	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days);

	return 0;
}

static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
	unsigned long secs;
	u32 tod, days;

	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);
	secs = tod & PCAP_RTC_TOD_MASK;

	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);
	secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;

	rtc_time64_to_tm(secs, tm);

	return 0;
}

static int pcap_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
	unsigned long secs = rtc_tm_to_time64(tm);
	u32 tod, days;

	tod = secs % SEC_PER_DAY;
	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod);

	days = secs / SEC_PER_DAY;
	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days);

	return 0;
}

static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en)
{
	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);

	if (en)
		enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
	else
		disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));

	return 0;
}

static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en)
{
	return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);
}

static const struct rtc_class_ops pcap_rtc_ops = {
	.read_time = pcap_rtc_read_time,
	.set_time = pcap_rtc_set_time,
	.read_alarm = pcap_rtc_read_alarm,
	.set_alarm = pcap_rtc_set_alarm,
	.alarm_irq_enable = pcap_rtc_alarm_irq_enable,
};

static int __init pcap_rtc_probe(struct platform_device *pdev)
{
	struct pcap_rtc *pcap_rtc;
	int timer_irq, alarm_irq;
	int err = -ENOMEM;

	pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),
				GFP_KERNEL);
	if (!pcap_rtc)
		return err;

	pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);

	platform_set_drvdata(pdev, pcap_rtc);

	pcap_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
	if (IS_ERR(pcap_rtc->rtc))
		return PTR_ERR(pcap_rtc->rtc);

	pcap_rtc->rtc->ops = &pcap_rtc_ops;
	pcap_rtc->rtc->range_max = (1 << 14) * 86400ULL - 1;

	timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
	alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);

	err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,
				"RTC Timer", pcap_rtc);
	if (err)
		return err;

	err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,
				"RTC Alarm", pcap_rtc);
	if (err)
		return err;

	return devm_rtc_register_device(pcap_rtc->rtc);
}

static int __exit pcap_rtc_remove(struct platform_device *pdev)
{
	return 0;
}

static struct platform_driver pcap_rtc_driver = {
	.remove = __exit_p(pcap_rtc_remove),
	.driver = {
		.name  = "pcap-rtc",
	},
};

module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);

MODULE_DESCRIPTION("Motorola pcap rtc driver");
MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
f5fae395	1	// SPDX-License-Identifier: GPL-2.0
d3c7a3f7 DR	2	/*
	3	* pcap rtc code for Motorola EZX phones
	4	*
	5	* Copyright (c) 2008 guiming zhuo <gmzhuo@gmail.com>
	6	* Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com>
	7	*
	8	* Based on Motorola's rtc.c Copyright (c) 2003-2005 Motorola
d3c7a3f7 DR	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/mfd/ezx-pcap.h>
	15	#include <linux/rtc.h>
5a0e3ad6	16	#include <linux/slab.h>
d3c7a3f7 DR	17	#include <linux/platform_device.h>
	18
	19	struct pcap_rtc {
	20	struct pcap_chip *pcap;
	21	struct rtc_device *rtc;
	22	};
	23
	24	static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc)
	25	{
	26	struct pcap_rtc *pcap_rtc = _pcap_rtc;
	27	unsigned long rtc_events;
	28
	29	if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ))
	30	rtc_events = RTC_IRQF \| RTC_UF;
	31	else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA))
	32	rtc_events = RTC_IRQF \| RTC_AF;
	33	else
	34	rtc_events = 0;
	35
	36	rtc_update_irq(pcap_rtc->rtc, 1, rtc_events);
	37	return IRQ_HANDLED;
	38	}
	39
	40	static int pcap_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	41	{
85368bb9	42	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
d3c7a3f7 DR	43	struct rtc_time *tm = &alrm->time;
	44	unsigned long secs;
	45	u32 tod; /* time of day, seconds since midnight */
	46	u32 days; /* days since 1/1/1970 */
	47
	48	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod);
	49	secs = tod & PCAP_RTC_TOD_MASK;
	50
	51	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days);
	52	secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
	53
03745d1f	54	rtc_time64_to_tm(secs, tm);
d3c7a3f7 DR	55
	56	return 0;
	57	}
	58
	59	static int pcap_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	60	{
85368bb9	61	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
03745d1f	62	unsigned long secs = rtc_tm_to_time64(&alrm->time);
d3c7a3f7 DR	63	u32 tod, days;
d3c7a3f7 DR	64
d3c7a3f7 DR	65	tod = secs % SEC_PER_DAY;
	66	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod);
	67
	68	days = secs / SEC_PER_DAY;
	69	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days);
	70
	71	return 0;
	72	}
	73
	74	static int pcap_rtc_read_time(struct device dev, struct rtc_time tm)
	75	{
85368bb9	76	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
d3c7a3f7 DR	77	unsigned long secs;
	78	u32 tod, days;
	79
	80	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);
	81	secs = tod & PCAP_RTC_TOD_MASK;
	82
	83	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);
	84	secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
	85
03745d1f	86	rtc_time64_to_tm(secs, tm);
d3c7a3f7	87
ab62670e	88	return 0;
d3c7a3f7 DR	89	}
d3c7a3f7 DR	90
c8b599ed	91	static int pcap_rtc_set_time(struct device dev, struct rtc_time tm)
d3c7a3f7	92	{
85368bb9	93	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
c8b599ed	94	unsigned long secs = rtc_tm_to_time64(tm);
d3c7a3f7 DR	95	u32 tod, days;
	96
	97	tod = secs % SEC_PER_DAY;
	98	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod);
	99
	100	days = secs / SEC_PER_DAY;
	101	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days);
	102
	103	return 0;
	104	}
	105
	106	static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en)
	107	{
85368bb9	108	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
d3c7a3f7 DR	109
	110	if (en)
	111	enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
	112	else
	113	disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
	114
	115	return 0;
	116	}
	117
	118	static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en)
	119	{
	120	return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);
	121	}
	122
d3c7a3f7 DR	123	static const struct rtc_class_ops pcap_rtc_ops = {
d3c7a3f7 DR	124	.read_time = pcap_rtc_read_time,
c8b599ed	125	.set_time = pcap_rtc_set_time,
d3c7a3f7 DR	126	.read_alarm = pcap_rtc_read_alarm,
d3c7a3f7 DR	127	.set_alarm = pcap_rtc_set_alarm,
d3c7a3f7	128	.alarm_irq_enable = pcap_rtc_alarm_irq_enable,
d3c7a3f7 DR	129	};
d3c7a3f7 DR	130
5cc2b9c6	131	static int __init pcap_rtc_probe(struct platform_device *pdev)
d3c7a3f7 DR	132	{
	133	struct pcap_rtc *pcap_rtc;
	134	int timer_irq, alarm_irq;
	135	int err = -ENOMEM;
	136
6b5f4862 JH	137	pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),
6b5f4862 JH	138	GFP_KERNEL);
d3c7a3f7 DR	139	if (!pcap_rtc)
	140	return err;
	141
	142	pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
	143
4b3687f9 JS	144	platform_set_drvdata(pdev, pcap_rtc);
4b3687f9 JS	145
d1403c48	146	pcap_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
a1c805a9 JH	147	if (IS_ERR(pcap_rtc->rtc))
a1c805a9 JH	148	return PTR_ERR(pcap_rtc->rtc);
d3c7a3f7	149
d1403c48 AB	150	pcap_rtc->rtc->ops = &pcap_rtc_ops;
	151	pcap_rtc->rtc->range_max = (1 << 14) * 86400ULL - 1;
	152
d3c7a3f7 DR	153	timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
	154	alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
	155
6b5f4862 JH	156	err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,
6b5f4862 JH	157	"RTC Timer", pcap_rtc);
d3c7a3f7	158	if (err)
a1c805a9	159	return err;
d3c7a3f7	160
6b5f4862 JH	161	err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,
6b5f4862 JH	162	"RTC Alarm", pcap_rtc);
d3c7a3f7	163	if (err)
a1c805a9	164	return err;
d3c7a3f7	165
fdcfd854	166	return devm_rtc_register_device(pcap_rtc->rtc);
d3c7a3f7 DR	167	}
d3c7a3f7 DR	168
5cc2b9c6	169	static int __exit pcap_rtc_remove(struct platform_device *pdev)
d3c7a3f7	170	{
d3c7a3f7 DR	171	return 0;
	172	}
	173
	174	static struct platform_driver pcap_rtc_driver = {
5cc2b9c6	175	.remove = __exit_p(pcap_rtc_remove),
d3c7a3f7 DR	176	.driver = {
d3c7a3f7 DR	177	.name = "pcap-rtc",
d3c7a3f7 DR	178	},
	179	};
	180
0de4c7c1	181	module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);
d3c7a3f7 DR	182
	183	MODULE_DESCRIPTION("Motorola pcap rtc driver");
	184	MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
	185	MODULE_LICENSE("GPL");