Root/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
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 __devinit 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 = kmalloc(sizeof(struct pcap_rtc), GFP_KERNEL);
149    if (!pcap_rtc)
150        return err;
151
152    pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
153
154    platform_set_drvdata(pdev, pcap_rtc);
155
156    pcap_rtc->rtc = rtc_device_register("pcap", &pdev->dev,
157                  &pcap_rtc_ops, THIS_MODULE);
158    if (IS_ERR(pcap_rtc->rtc)) {
159        err = PTR_ERR(pcap_rtc->rtc);
160        goto fail_rtc;
161    }
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 = request_irq(timer_irq, pcap_rtc_irq, 0, "RTC Timer", pcap_rtc);
168    if (err)
169        goto fail_timer;
170
171    err = request_irq(alarm_irq, pcap_rtc_irq, 0, "RTC Alarm", pcap_rtc);
172    if (err)
173        goto fail_alarm;
174
175    return 0;
176fail_alarm:
177    free_irq(timer_irq, pcap_rtc);
178fail_timer:
179    rtc_device_unregister(pcap_rtc->rtc);
180fail_rtc:
181    platform_set_drvdata(pdev, NULL);
182    kfree(pcap_rtc);
183    return err;
184}
185
186static int __devexit pcap_rtc_remove(struct platform_device *pdev)
187{
188    struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
189
190    free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ), pcap_rtc);
191    free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA), pcap_rtc);
192    rtc_device_unregister(pcap_rtc->rtc);
193    kfree(pcap_rtc);
194
195    return 0;
196}
197
198static struct platform_driver pcap_rtc_driver = {
199    .remove = __devexit_p(pcap_rtc_remove),
200    .driver = {
201        .name = "pcap-rtc",
202        .owner = THIS_MODULE,
203    },
204};
205
206static int __init rtc_pcap_init(void)
207{
208    return platform_driver_probe(&pcap_rtc_driver, pcap_rtc_probe);
209}
210
211static void __exit rtc_pcap_exit(void)
212{
213    platform_driver_unregister(&pcap_rtc_driver);
214}
215
216module_init(rtc_pcap_init);
217module_exit(rtc_pcap_exit);
218
219MODULE_DESCRIPTION("Motorola pcap rtc driver");
220MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
221MODULE_LICENSE("GPL");
222

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