Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...
[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/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 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");