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

/*
 *  pcap rtc code for Motorola EZX phones
 *
 *  Copyright (c) 2008 guiming zhuo <[email protected]>
 *  Copyright (c) 2009 Daniel Ribeiro <[email protected]>
 *
 *  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 platform_device *pdev = to_platform_device(dev);
	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
	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_time_to_tm(secs, tm);

	return 0;
}

static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
	struct rtc_time *tm = &alrm->time;
	unsigned long secs;
	u32 tod, days;

	rtc_tm_to_time(tm, &secs);

	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 platform_device *pdev = to_platform_device(dev);
	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
	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_time_to_tm(secs, tm);

	return 0;
}

static int pcap_rtc_set_mmss(struct device *dev, unsigned long secs)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
	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 platform_device *pdev = to_platform_device(dev);
	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);

	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_device_register(&pdev->dev, "pcap",
					&pcap_rtc_ops, THIS_MODULE);
	if (IS_ERR(pcap_rtc->rtc))
		return PTR_ERR(pcap_rtc->rtc);

	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 0;
}

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 <[email protected]>");
MODULE_LICENSE("GPL");
Commit	Line	Data
d3c7a3f7 DR	1	/*
	2	* pcap rtc code for Motorola EZX phones
	3	*
	4	* Copyright (c) 2008 guiming zhuo <[email protected]>
	5	* Copyright (c) 2009 Daniel Ribeiro <[email protected]>
	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	{
	46	struct platform_device *pdev = to_platform_device(dev);
	47	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
	48	struct rtc_time *tm = &alrm->time;
	49	unsigned long secs;
	50	u32 tod; /* time of day, seconds since midnight */
	51	u32 days; /* days since 1/1/1970 */
	52
	53	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod);
	54	secs = tod & PCAP_RTC_TOD_MASK;
	55
	56	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days);
	57	secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
	58
	59	rtc_time_to_tm(secs, tm);
	60
	61	return 0;
	62	}
	63
	64	static int pcap_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	65	{
	66	struct platform_device *pdev = to_platform_device(dev);
	67	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
	68	struct rtc_time *tm = &alrm->time;
	69	unsigned long secs;
	70	u32 tod, days;
	71
	72	rtc_tm_to_time(tm, &secs);
	73
	74	tod = secs % SEC_PER_DAY;
	75	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod);
	76
	77	days = secs / SEC_PER_DAY;
	78	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days);
	79
	80	return 0;
	81	}
	82
	83	static int pcap_rtc_read_time(struct device dev, struct rtc_time tm)
	84	{
85	struct platform_device *pdev = to_platform_device(dev);
86	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
87	unsigned long secs;
88	u32 tod, days;
89
90	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);
91	secs = tod & PCAP_RTC_TOD_MASK;
92
93	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);
94	secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
95
96	rtc_time_to_tm(secs, tm);
97
ab62670e	98	return 0;
d3c7a3f7 DR	99	}
	100
	101	static int pcap_rtc_set_mmss(struct device *dev, unsigned long secs)
	102	{
	103	struct platform_device *pdev = to_platform_device(dev);
	104	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
	105	u32 tod, days;
	106
	107	tod = secs % SEC_PER_DAY;
	108	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod);
	109
	110	days = secs / SEC_PER_DAY;
	111	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days);
	112
	113	return 0;
	114	}
	115
	116	static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en)
	117	{
	118	struct platform_device *pdev = to_platform_device(dev);
	119	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
	120
	121	if (en)
	122	enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
	123	else
	124	disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
	125
	126	return 0;
	127	}
	128
	129	static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en)
	130	{
	131	return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);
	132	}
	133
d3c7a3f7 DR	134	static const struct rtc_class_ops pcap_rtc_ops = {
	135	.read_time = pcap_rtc_read_time,
	136	.read_alarm = pcap_rtc_read_alarm,
	137	.set_alarm = pcap_rtc_set_alarm,
	138	.set_mmss = pcap_rtc_set_mmss,
	139	.alarm_irq_enable = pcap_rtc_alarm_irq_enable,
d3c7a3f7 DR	140	};
d3c7a3f7 DR	141
5cc2b9c6	142	static int __init pcap_rtc_probe(struct platform_device *pdev)
d3c7a3f7 DR	143	{
	144	struct pcap_rtc *pcap_rtc;
	145	int timer_irq, alarm_irq;
	146	int err = -ENOMEM;
	147
6b5f4862 JH	148	pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),
6b5f4862 JH	149	GFP_KERNEL);
d3c7a3f7 DR	150	if (!pcap_rtc)
	151	return err;
	152
	153	pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
	154
4b3687f9 JS	155	platform_set_drvdata(pdev, pcap_rtc);
4b3687f9 JS	156
6b5f4862 JH	157	pcap_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pcap",
6b5f4862 JH	158	&pcap_rtc_ops, THIS_MODULE);
a1c805a9 JH	159	if (IS_ERR(pcap_rtc->rtc))
a1c805a9 JH	160	return PTR_ERR(pcap_rtc->rtc);
d3c7a3f7	161
d3c7a3f7 DR	162	timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
	163	alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
	164
6b5f4862 JH	165	err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,
6b5f4862 JH	166	"RTC Timer", pcap_rtc);
d3c7a3f7	167	if (err)
a1c805a9	168	return err;
d3c7a3f7	169
6b5f4862 JH	170	err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,
6b5f4862 JH	171	"RTC Alarm", pcap_rtc);
d3c7a3f7	172	if (err)
a1c805a9	173	return err;
d3c7a3f7 DR	174
d3c7a3f7 DR	175	return 0;
d3c7a3f7 DR	176	}
d3c7a3f7 DR	177
5cc2b9c6	178	static int __exit pcap_rtc_remove(struct platform_device *pdev)
d3c7a3f7	179	{
d3c7a3f7 DR	180	return 0;
	181	}
	182
	183	static struct platform_driver pcap_rtc_driver = {
5cc2b9c6	184	.remove = __exit_p(pcap_rtc_remove),
d3c7a3f7 DR	185	.driver = {
d3c7a3f7 DR	186	.name = "pcap-rtc",
d3c7a3f7 DR	187	},
	188	};
	189
0de4c7c1	190	module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);
d3c7a3f7 DR	191
	192	MODULE_DESCRIPTION("Motorola pcap rtc driver");
	193	MODULE_AUTHOR("guiming zhuo <[email protected]>");
	194	MODULE_LICENSE("GPL");