rtc: Add max77660 rtc driver
[linux-3.10.git] / drivers / rtc / rtc-pcap.c
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
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 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
142 static 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                 err = PTR_ERR(pcap_rtc->rtc);
161                 goto fail;
162         }
163
164         timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
165         alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
166
167         err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,
168                                 "RTC Timer", pcap_rtc);
169         if (err)
170                 goto fail;
171
172         err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,
173                                 "RTC Alarm", pcap_rtc);
174         if (err)
175                 goto fail;
176
177         return 0;
178 fail:
179         platform_set_drvdata(pdev, NULL);
180         return err;
181 }
182
183 static int __exit pcap_rtc_remove(struct platform_device *pdev)
184 {
185         return 0;
186 }
187
188 static struct platform_driver pcap_rtc_driver = {
189         .remove = __exit_p(pcap_rtc_remove),
190         .driver = {
191                 .name  = "pcap-rtc",
192                 .owner = THIS_MODULE,
193         },
194 };
195
196 module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);
197
198 MODULE_DESCRIPTION("Motorola pcap rtc driver");
199 MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
200 MODULE_LICENSE("GPL");