tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
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
63static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
64{
65 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
66 struct rtc_time *tm = &alrm->time;
67 unsigned long secs;
68 u32 tod, days;
69
70 rtc_tm_to_time(tm, &secs);
71
72 tod = secs % SEC_PER_DAY;
73 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod);
74
75 days = secs / SEC_PER_DAY;
76 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days);
77
78 return 0;
79}
80
81static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm)
82{
83 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
84 unsigned long secs;
85 u32 tod, days;
86
87 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);
88 secs = tod & PCAP_RTC_TOD_MASK;
89
90 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);
91 secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
92
93 rtc_time_to_tm(secs, tm);
94
95 return 0;
96}
97
98static int pcap_rtc_set_mmss(struct device *dev, unsigned long secs)
99{
100 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
101 u32 tod, days;
102
103 tod = secs % SEC_PER_DAY;
104 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod);
105
106 days = secs / SEC_PER_DAY;
107 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days);
108
109 return 0;
110}
111
112static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en)
113{
114 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
115
116 if (en)
117 enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
118 else
119 disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
120
121 return 0;
122}
123
124static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en)
125{
126 return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);
127}
128
129static const struct rtc_class_ops pcap_rtc_ops = {
130 .read_time = pcap_rtc_read_time,
131 .read_alarm = pcap_rtc_read_alarm,
132 .set_alarm = pcap_rtc_set_alarm,
133 .set_mmss = pcap_rtc_set_mmss,
134 .alarm_irq_enable = pcap_rtc_alarm_irq_enable,
135};
136
137static int __init pcap_rtc_probe(struct platform_device *pdev)
138{
139 struct pcap_rtc *pcap_rtc;
140 int timer_irq, alarm_irq;
141 int err = -ENOMEM;
142
143 pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),
144 GFP_KERNEL);
145 if (!pcap_rtc)
146 return err;
147
148 pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
149
150 platform_set_drvdata(pdev, pcap_rtc);
151
152 pcap_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pcap",
153 &pcap_rtc_ops, THIS_MODULE);
154 if (IS_ERR(pcap_rtc->rtc))
155 return PTR_ERR(pcap_rtc->rtc);
156
157 timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
158 alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
159
160 err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,
161 "RTC Timer", pcap_rtc);
162 if (err)
163 return err;
164
165 err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,
166 "RTC Alarm", pcap_rtc);
167 if (err)
168 return err;
169
170 return 0;
171}
172
173static int __exit pcap_rtc_remove(struct platform_device *pdev)
174{
175 return 0;
176}
177
178static struct platform_driver pcap_rtc_driver = {
179 .remove = __exit_p(pcap_rtc_remove),
180 .driver = {
181 .name = "pcap-rtc",
182 },
183};
184
185module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);
186
187MODULE_DESCRIPTION("Motorola pcap rtc driver");
188MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
189MODULE_LICENSE("GPL");