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11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/mfd/ezx-pcap.h>
15#include <linux/rtc.h>
16#include <linux/slab.h>
17#include <linux/platform_device.h>
18
19struct pcap_rtc {
20 struct pcap_chip *pcap;
21 struct rtc_device *rtc;
22};
23
24static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc)
25{
26 struct pcap_rtc *pcap_rtc = _pcap_rtc;
27 unsigned long rtc_events;
28
29 if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ))
30 rtc_events = RTC_IRQF | RTC_UF;
31 else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA))
32 rtc_events = RTC_IRQF | RTC_AF;
33 else
34 rtc_events = 0;
35
36 rtc_update_irq(pcap_rtc->rtc, 1, rtc_events);
37 return IRQ_HANDLED;
38}
39
40static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
41{
42 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
43 struct rtc_time *tm = &alrm->time;
44 unsigned long secs;
45 u32 tod;
46 u32 days;
47
48 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod);
49 secs = tod & PCAP_RTC_TOD_MASK;
50
51 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days);
52 secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
53
54 rtc_time64_to_tm(secs, tm);
55
56 return 0;
57}
58
59static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
60{
61 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
62 unsigned long secs = rtc_tm_to_time64(&alrm->time);
63 u32 tod, days;
64
65 tod = secs % SEC_PER_DAY;
66 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod);
67
68 days = secs / SEC_PER_DAY;
69 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days);
70
71 return 0;
72}
73
74static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm)
75{
76 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
77 unsigned long secs;
78 u32 tod, days;
79
80 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);
81 secs = tod & PCAP_RTC_TOD_MASK;
82
83 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);
84 secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
85
86 rtc_time64_to_tm(secs, tm);
87
88 return 0;
89}
90
91static int pcap_rtc_set_time(struct device *dev, struct rtc_time *tm)
92{
93 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
94 unsigned long secs = rtc_tm_to_time64(tm);
95 u32 tod, days;
96
97 tod = secs % SEC_PER_DAY;
98 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod);
99
100 days = secs / SEC_PER_DAY;
101 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days);
102
103 return 0;
104}
105
106static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en)
107{
108 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);
109
110 if (en)
111 enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
112 else
113 disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
114
115 return 0;
116}
117
118static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en)
119{
120 return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);
121}
122
123static const struct rtc_class_ops pcap_rtc_ops = {
124 .read_time = pcap_rtc_read_time,
125 .set_time = pcap_rtc_set_time,
126 .read_alarm = pcap_rtc_read_alarm,
127 .set_alarm = pcap_rtc_set_alarm,
128 .alarm_irq_enable = pcap_rtc_alarm_irq_enable,
129};
130
131static int __init pcap_rtc_probe(struct platform_device *pdev)
132{
133 struct pcap_rtc *pcap_rtc;
134 int timer_irq, alarm_irq;
135 int err = -ENOMEM;
136
137 pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),
138 GFP_KERNEL);
139 if (!pcap_rtc)
140 return err;
141
142 pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
143
144 platform_set_drvdata(pdev, pcap_rtc);
145
146 pcap_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
147 if (IS_ERR(pcap_rtc->rtc))
148 return PTR_ERR(pcap_rtc->rtc);
149
150 pcap_rtc->rtc->ops = &pcap_rtc_ops;
151 pcap_rtc->rtc->range_max = (1 << 14) * 86400ULL - 1;
152
153 timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
154 alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
155
156 err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,
157 "RTC Timer", pcap_rtc);
158 if (err)
159 return err;
160
161 err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,
162 "RTC Alarm", pcap_rtc);
163 if (err)
164 return err;
165
166 return rtc_register_device(pcap_rtc->rtc);
167}
168
169static int __exit pcap_rtc_remove(struct platform_device *pdev)
170{
171 return 0;
172}
173
174static struct platform_driver pcap_rtc_driver = {
175 .remove = __exit_p(pcap_rtc_remove),
176 .driver = {
177 .name = "pcap-rtc",
178 },
179};
180
181module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);
182
183MODULE_DESCRIPTION("Motorola pcap rtc driver");
184MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
185MODULE_LICENSE("GPL");
186
