Commit | Line | Data |
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f5fae395 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d3c7a3f7 DR |
2 | /* |
3 | * pcap rtc code for Motorola EZX phones | |
4 | * | |
5 | * Copyright (c) 2008 guiming zhuo <gmzhuo@gmail.com> | |
6 | * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com> | |
7 | * | |
8 | * Based on Motorola's rtc.c Copyright (c) 2003-2005 Motorola | |
d3c7a3f7 DR |
9 | */ |
10 | ||
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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
d3c7a3f7 DR |
17 | #include <linux/platform_device.h> |
18 | ||
19 | struct pcap_rtc { | |
20 | struct pcap_chip *pcap; | |
21 | struct rtc_device *rtc; | |
22 | }; | |
23 | ||
24 | static 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 | ||
40 | static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
41 | { | |
85368bb9 | 42 | struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); |
d3c7a3f7 DR |
43 | struct rtc_time *tm = &alrm->time; |
44 | unsigned long secs; | |
45 | u32 tod; /* time of day, seconds since midnight */ | |
46 | u32 days; /* days since 1/1/1970 */ | |
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 | ||
03745d1f | 54 | rtc_time64_to_tm(secs, tm); |
d3c7a3f7 DR |
55 | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
60 | { | |
85368bb9 | 61 | struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); |
03745d1f | 62 | unsigned long secs = rtc_tm_to_time64(&alrm->time); |
d3c7a3f7 DR |
63 | u32 tod, days; |
64 | ||
d3c7a3f7 DR |
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 | ||
74 | static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
75 | { | |
85368bb9 | 76 | struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); |
d3c7a3f7 DR |
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 | ||
03745d1f | 86 | rtc_time64_to_tm(secs, tm); |
d3c7a3f7 | 87 | |
ab62670e | 88 | return 0; |
d3c7a3f7 DR |
89 | } |
90 | ||
c8b599ed | 91 | static int pcap_rtc_set_time(struct device *dev, struct rtc_time *tm) |
d3c7a3f7 | 92 | { |
85368bb9 | 93 | struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); |
c8b599ed | 94 | unsigned long secs = rtc_tm_to_time64(tm); |
d3c7a3f7 DR |
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 | ||
106 | static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en) | |
107 | { | |
85368bb9 | 108 | struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); |
d3c7a3f7 DR |
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 | ||
118 | static 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 | ||
d3c7a3f7 DR |
123 | static const struct rtc_class_ops pcap_rtc_ops = { |
124 | .read_time = pcap_rtc_read_time, | |
c8b599ed | 125 | .set_time = pcap_rtc_set_time, |
d3c7a3f7 DR |
126 | .read_alarm = pcap_rtc_read_alarm, |
127 | .set_alarm = pcap_rtc_set_alarm, | |
d3c7a3f7 | 128 | .alarm_irq_enable = pcap_rtc_alarm_irq_enable, |
d3c7a3f7 DR |
129 | }; |
130 | ||
5cc2b9c6 | 131 | static int __init pcap_rtc_probe(struct platform_device *pdev) |
d3c7a3f7 DR |
132 | { |
133 | struct pcap_rtc *pcap_rtc; | |
134 | int timer_irq, alarm_irq; | |
135 | int err = -ENOMEM; | |
136 | ||
6b5f4862 JH |
137 | pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc), |
138 | GFP_KERNEL); | |
d3c7a3f7 DR |
139 | if (!pcap_rtc) |
140 | return err; | |
141 | ||
142 | pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent); | |
143 | ||
4b3687f9 JS |
144 | platform_set_drvdata(pdev, pcap_rtc); |
145 | ||
d1403c48 | 146 | pcap_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); |
a1c805a9 JH |
147 | if (IS_ERR(pcap_rtc->rtc)) |
148 | return PTR_ERR(pcap_rtc->rtc); | |
d3c7a3f7 | 149 | |
d1403c48 AB |
150 | pcap_rtc->rtc->ops = &pcap_rtc_ops; |
151 | pcap_rtc->rtc->range_max = (1 << 14) * 86400ULL - 1; | |
152 | ||
d3c7a3f7 DR |
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 | ||
6b5f4862 JH |
156 | err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0, |
157 | "RTC Timer", pcap_rtc); | |
d3c7a3f7 | 158 | if (err) |
a1c805a9 | 159 | return err; |
d3c7a3f7 | 160 | |
6b5f4862 JH |
161 | err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0, |
162 | "RTC Alarm", pcap_rtc); | |
d3c7a3f7 | 163 | if (err) |
a1c805a9 | 164 | return err; |
d3c7a3f7 | 165 | |
d1403c48 | 166 | return rtc_register_device(pcap_rtc->rtc); |
d3c7a3f7 DR |
167 | } |
168 | ||
5cc2b9c6 | 169 | static int __exit pcap_rtc_remove(struct platform_device *pdev) |
d3c7a3f7 | 170 | { |
d3c7a3f7 DR |
171 | return 0; |
172 | } | |
173 | ||
174 | static struct platform_driver pcap_rtc_driver = { | |
5cc2b9c6 | 175 | .remove = __exit_p(pcap_rtc_remove), |
d3c7a3f7 DR |
176 | .driver = { |
177 | .name = "pcap-rtc", | |
d3c7a3f7 DR |
178 | }, |
179 | }; | |
180 | ||
0de4c7c1 | 181 | module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe); |
d3c7a3f7 DR |
182 | |
183 | MODULE_DESCRIPTION("Motorola pcap rtc driver"); | |
184 | MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>"); | |
185 | MODULE_LICENSE("GPL"); |