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>
20#include <linux/slab.h>
21#include <linux/platform_device.h>
22
23struct pcap_rtc {
24	struct pcap_chip *pcap;
25	struct rtc_device *rtc;
26};
27
28static 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
44static 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
64static 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
83static 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
101static 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
116static 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
129static 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
134static 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,
140};
141
142static int __init pcap_rtc_probe(struct platform_device *pdev)
143{
144	struct pcap_rtc *pcap_rtc;
145	int timer_irq, alarm_irq;
146	int err = -ENOMEM;
147
148	pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),
149				GFP_KERNEL);
150	if (!pcap_rtc)
151		return err;
152
153	pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
154
155	platform_set_drvdata(pdev, pcap_rtc);
156
157	pcap_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pcap",
158					&pcap_rtc_ops, THIS_MODULE);
159	if (IS_ERR(pcap_rtc->rtc))
160		return PTR_ERR(pcap_rtc->rtc);
161
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
165	err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,
166				"RTC Timer", pcap_rtc);
167	if (err)
168		return err;
169
170	err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,
171				"RTC Alarm", pcap_rtc);
172	if (err)
173		return err;
174
175	return 0;
176}
177
178static int __exit pcap_rtc_remove(struct platform_device *pdev)
179{
180	return 0;
181}
182
183static struct platform_driver pcap_rtc_driver = {
184	.remove = __exit_p(pcap_rtc_remove),
185	.driver = {
186		.name  = "pcap-rtc",
187		.owner = THIS_MODULE,
188	},
189};
190
191module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);
192
193MODULE_DESCRIPTION("Motorola pcap rtc driver");
194MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
195MODULE_LICENSE("GPL");
196