summaryrefslogtreecommitdiffstats
path: root/drivers/rtc/rtc-pcap.c
blob: 178bfb1dea2140540fa78dff951ebfc64816087f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
// 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 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");