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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;
51 u32 days;
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 __init 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 = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),
149 GFP_KERNEL);
150 if (!pcap_rtc)
151 return err;
152
153 pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
154
155 platform_set_drvdata(pdev, pcap_rtc);
156
157 pcap_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pcap",
158 &pcap_rtc_ops, THIS_MODULE);
159 if (IS_ERR(pcap_rtc->rtc))
160 return PTR_ERR(pcap_rtc->rtc);
161
162 timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
163 alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
164
165 err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,
166 "RTC Timer", pcap_rtc);
167 if (err)
168 return err;
169
170 err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,
171 "RTC Alarm", pcap_rtc);
172 if (err)
173 return err;
174
175 return 0;
176}
177
178static int __exit pcap_rtc_remove(struct platform_device *pdev)
179{
180 return 0;
181}
182
183static struct platform_driver pcap_rtc_driver = {
184 .remove = __exit_p(pcap_rtc_remove),
185 .driver = {
186 .name = "pcap-rtc",
187 },
188};
189
190module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);
191
192MODULE_DESCRIPTION("Motorola pcap rtc driver");
193MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
194MODULE_LICENSE("GPL");
195
