Merge branch 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6.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/platform_device.h>
21
22 struct pcap_rtc {
23         struct pcap_chip *pcap;
24         struct rtc_device *rtc;
25 };
26
27 static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc)
28 {
29         struct pcap_rtc *pcap_rtc = _pcap_rtc;
30         unsigned long rtc_events;
31
32         if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ))
33                 rtc_events = RTC_IRQF | RTC_UF;
34         else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA))
35                 rtc_events = RTC_IRQF | RTC_AF;
36         else
37                 rtc_events = 0;
38
39         rtc_update_irq(pcap_rtc->rtc, 1, rtc_events);
40         return IRQ_HANDLED;
41 }
42
43 static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
44 {
45         struct platform_device *pdev = to_platform_device(dev);
46         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
47         struct rtc_time *tm = &alrm->time;
48         unsigned long secs;
49         u32 tod;        /* time of day, seconds since midnight */
50         u32 days;       /* days since 1/1/1970 */
51
52         ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod);
53         secs = tod & PCAP_RTC_TOD_MASK;
54
55         ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days);
56         secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
57
58         rtc_time_to_tm(secs, tm);
59
60         return 0;
61 }
62
63 static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
64 {
65         struct platform_device *pdev = to_platform_device(dev);
66         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
67         struct rtc_time *tm = &alrm->time;
68         unsigned long secs;
69         u32 tod, days;
70
71         rtc_tm_to_time(tm, &secs);
72
73         tod = secs % SEC_PER_DAY;
74         ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod);
75
76         days = secs / SEC_PER_DAY;
77         ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days);
78
79         return 0;
80 }
81
82 static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm)
83 {
84         struct platform_device *pdev = to_platform_device(dev);
85         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
86         unsigned long secs;
87         u32 tod, days;
88
89         ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);
90         secs = tod & PCAP_RTC_TOD_MASK;
91
92         ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);
93         secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
94
95         rtc_time_to_tm(secs, tm);
96
97         return rtc_valid_tm(tm);
98 }
99
100 static int pcap_rtc_set_mmss(struct device *dev, unsigned long secs)
101 {
102         struct platform_device *pdev = to_platform_device(dev);
103         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
104         u32 tod, days;
105
106         tod = secs % SEC_PER_DAY;
107         ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod);
108
109         days = secs / SEC_PER_DAY;
110         ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days);
111
112         return 0;
113 }
114
115 static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en)
116 {
117         struct platform_device *pdev = to_platform_device(dev);
118         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
119
120         if (en)
121                 enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
122         else
123                 disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
124
125         return 0;
126 }
127
128 static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en)
129 {
130         return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);
131 }
132
133 static int pcap_rtc_update_irq_enable(struct device *dev, unsigned int en)
134 {
135         return pcap_rtc_irq_enable(dev, PCAP_IRQ_1HZ, en);
136 }
137
138 static const struct rtc_class_ops pcap_rtc_ops = {
139         .read_time = pcap_rtc_read_time,
140         .read_alarm = pcap_rtc_read_alarm,
141         .set_alarm = pcap_rtc_set_alarm,
142         .set_mmss = pcap_rtc_set_mmss,
143         .alarm_irq_enable = pcap_rtc_alarm_irq_enable,
144         .update_irq_enable = pcap_rtc_update_irq_enable,
145 };
146
147 static int __devinit pcap_rtc_probe(struct platform_device *pdev)
148 {
149         struct pcap_rtc *pcap_rtc;
150         int timer_irq, alarm_irq;
151         int err = -ENOMEM;
152
153         pcap_rtc = kmalloc(sizeof(struct pcap_rtc), GFP_KERNEL);
154         if (!pcap_rtc)
155                 return err;
156
157         pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
158
159         pcap_rtc->rtc = rtc_device_register("pcap", &pdev->dev,
160                                   &pcap_rtc_ops, THIS_MODULE);
161         if (IS_ERR(pcap_rtc->rtc)) {
162                 err = PTR_ERR(pcap_rtc->rtc);
163                 goto fail_rtc;
164         }
165
166         platform_set_drvdata(pdev, pcap_rtc);
167
168         timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
169         alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
170
171         err = request_irq(timer_irq, pcap_rtc_irq, 0, "RTC Timer", pcap_rtc);
172         if (err)
173                 goto fail_timer;
174
175         err = request_irq(alarm_irq, pcap_rtc_irq, 0, "RTC Alarm", pcap_rtc);
176         if (err)
177                 goto fail_alarm;
178
179         return 0;
180 fail_alarm:
181         free_irq(timer_irq, pcap_rtc);
182 fail_timer:
183         rtc_device_unregister(pcap_rtc->rtc);
184 fail_rtc:
185         kfree(pcap_rtc);
186         return err;
187 }
188
189 static int __devexit pcap_rtc_remove(struct platform_device *pdev)
190 {
191         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
192
193         free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ), pcap_rtc);
194         free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA), pcap_rtc);
195         rtc_device_unregister(pcap_rtc->rtc);
196         kfree(pcap_rtc);
197
198         return 0;
199 }
200
201 static struct platform_driver pcap_rtc_driver = {
202         .remove = __devexit_p(pcap_rtc_remove),
203         .driver = {
204                 .name  = "pcap-rtc",
205                 .owner = THIS_MODULE,
206         },
207 };
208
209 static int __init rtc_pcap_init(void)
210 {
211         return platform_driver_probe(&pcap_rtc_driver, pcap_rtc_probe);
212 }
213
214 static void __exit rtc_pcap_exit(void)
215 {
216         platform_driver_unregister(&pcap_rtc_driver);
217 }
218
219 module_init(rtc_pcap_init);
220 module_exit(rtc_pcap_exit);
221
222 MODULE_DESCRIPTION("Motorola pcap rtc driver");
223 MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
224 MODULE_LICENSE("GPL");