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

/*
 *  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
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 */

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