[net-next-2.6.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 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 rtc_valid_tm(tm);
}

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 int pcap_rtc_update_irq_enable(struct device *dev, unsigned int en)
{
	return pcap_rtc_irq_enable(dev, PCAP_IRQ_1HZ, 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,
	.update_irq_enable = pcap_rtc_update_irq_enable,
};

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

	pcap_rtc = kmalloc(sizeof(struct pcap_rtc), GFP_KERNEL);
	if (!pcap_rtc)
		return err;

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

	pcap_rtc->rtc = rtc_device_register("pcap", &pdev->dev,
				  &pcap_rtc_ops, THIS_MODULE);
	if (IS_ERR(pcap_rtc->rtc)) {
		err = PTR_ERR(pcap_rtc->rtc);
		goto fail_rtc;
	}

	platform_set_drvdata(pdev, pcap_rtc);

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

	err = request_irq(timer_irq, pcap_rtc_irq, 0, "RTC Timer", pcap_rtc);
	if (err)
		goto fail_timer;

	err = request_irq(alarm_irq, pcap_rtc_irq, 0, "RTC Alarm", pcap_rtc);
	if (err)
		goto fail_alarm;

	return 0;
fail_alarm:
	free_irq(timer_irq, pcap_rtc);
fail_timer:
	rtc_device_unregister(pcap_rtc->rtc);
fail_rtc:
	kfree(pcap_rtc);
	return err;
}

static int __devexit pcap_rtc_remove(struct platform_device *pdev)
{
	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);

	free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ), pcap_rtc);
	free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA), pcap_rtc);
	rtc_device_unregister(pcap_rtc->rtc);
	kfree(pcap_rtc);

	return 0;
}

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

static int __init rtc_pcap_init(void)
{
	return platform_driver_probe(&pcap_rtc_driver, pcap_rtc_probe);
}

static void __exit rtc_pcap_exit(void)
{
	platform_driver_unregister(&pcap_rtc_driver);
}

module_init(rtc_pcap_init);
module_exit(rtc_pcap_exit);

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	{
	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
98	return rtc_valid_tm(tm);
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
134	static int pcap_rtc_update_irq_enable(struct device *dev, unsigned int en)
135	{
136	return pcap_rtc_irq_enable(dev, PCAP_IRQ_1HZ, en);
137	}
138
139	static const struct rtc_class_ops pcap_rtc_ops = {
140	.read_time = pcap_rtc_read_time,
141	.read_alarm = pcap_rtc_read_alarm,
142	.set_alarm = pcap_rtc_set_alarm,
143	.set_mmss = pcap_rtc_set_mmss,
144	.alarm_irq_enable = pcap_rtc_alarm_irq_enable,
145	.update_irq_enable = pcap_rtc_update_irq_enable,
146	};
147
148	static int __devinit pcap_rtc_probe(struct platform_device *pdev)
149	{
150	struct pcap_rtc *pcap_rtc;
151	int timer_irq, alarm_irq;
152	int err = -ENOMEM;
153
154	pcap_rtc = kmalloc(sizeof(struct pcap_rtc), GFP_KERNEL);
155	if (!pcap_rtc)
156	return err;
157
158	pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
159
160	pcap_rtc->rtc = rtc_device_register("pcap", &pdev->dev,
161	&pcap_rtc_ops, THIS_MODULE);
162	if (IS_ERR(pcap_rtc->rtc)) {
163	err = PTR_ERR(pcap_rtc->rtc);
164	goto fail_rtc;
165	}
166
167	platform_set_drvdata(pdev, pcap_rtc);
168
169	timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
170	alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
171
172	err = request_irq(timer_irq, pcap_rtc_irq, 0, "RTC Timer", pcap_rtc);
173	if (err)
174	goto fail_timer;
175
176	err = request_irq(alarm_irq, pcap_rtc_irq, 0, "RTC Alarm", pcap_rtc);
177	if (err)
178	goto fail_alarm;
179
180	return 0;
181	fail_alarm:
182	free_irq(timer_irq, pcap_rtc);
183	fail_timer:
184	rtc_device_unregister(pcap_rtc->rtc);
185	fail_rtc:
186	kfree(pcap_rtc);
187	return err;
188	}
189
190	static int __devexit pcap_rtc_remove(struct platform_device *pdev)
191	{
192	struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
193
194	free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ), pcap_rtc);
195	free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA), pcap_rtc);
196	rtc_device_unregister(pcap_rtc->rtc);
197	kfree(pcap_rtc);
198
199	return 0;
200	}
201
202	static struct platform_driver pcap_rtc_driver = {
203	.remove = __devexit_p(pcap_rtc_remove),
204	.driver = {
205	.name = "pcap-rtc",
206	.owner = THIS_MODULE,
207	},
208	};
209
210	static int __init rtc_pcap_init(void)
211	{
212	return platform_driver_probe(&pcap_rtc_driver, pcap_rtc_probe);
213	}
214
215	static void __exit rtc_pcap_exit(void)
216	{
217	platform_driver_unregister(&pcap_rtc_driver);
218	}
219
220	module_init(rtc_pcap_init);
221	module_exit(rtc_pcap_exit);
222
223	MODULE_DESCRIPTION("Motorola pcap rtc driver");
224	MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
225	MODULE_LICENSE("GPL");