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d3c7a3f7 DR |
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> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
d3c7a3f7 DR |
21 | #include <linux/platform_device.h> |
22 | ||
23 | struct pcap_rtc { | |
24 | struct pcap_chip *pcap; | |
25 | struct rtc_device *rtc; | |
26 | }; | |
27 | ||
28 | static 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 | ||
44 | static 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 | ||
64 | static 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 | ||
83 | static 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 | ||
101 | static 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 | ||
116 | static 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 | ||
129 | static 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 | ||
d3c7a3f7 DR |
134 | static 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, | |
d3c7a3f7 DR |
140 | }; |
141 | ||
5a167f45 | 142 | static int pcap_rtc_probe(struct platform_device *pdev) |
d3c7a3f7 DR |
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 | ||
4b3687f9 JS |
154 | platform_set_drvdata(pdev, pcap_rtc); |
155 | ||
d3c7a3f7 DR |
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 | ||
d3c7a3f7 DR |
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; | |
176 | fail_alarm: | |
177 | free_irq(timer_irq, pcap_rtc); | |
178 | fail_timer: | |
179 | rtc_device_unregister(pcap_rtc->rtc); | |
180 | fail_rtc: | |
4b3687f9 | 181 | platform_set_drvdata(pdev, NULL); |
d3c7a3f7 DR |
182 | kfree(pcap_rtc); |
183 | return err; | |
184 | } | |
185 | ||
5a167f45 | 186 | static int pcap_rtc_remove(struct platform_device *pdev) |
d3c7a3f7 DR |
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 | ||
198 | static struct platform_driver pcap_rtc_driver = { | |
5a167f45 | 199 | .remove = pcap_rtc_remove, |
d3c7a3f7 DR |
200 | .driver = { |
201 | .name = "pcap-rtc", | |
202 | .owner = THIS_MODULE, | |
203 | }, | |
204 | }; | |
205 | ||
206 | static int __init rtc_pcap_init(void) | |
207 | { | |
208 | return platform_driver_probe(&pcap_rtc_driver, pcap_rtc_probe); | |
209 | } | |
210 | ||
211 | static void __exit rtc_pcap_exit(void) | |
212 | { | |
213 | platform_driver_unregister(&pcap_rtc_driver); | |
214 | } | |
215 | ||
216 | module_init(rtc_pcap_init); | |
217 | module_exit(rtc_pcap_exit); | |
218 | ||
219 | MODULE_DESCRIPTION("Motorola pcap rtc driver"); | |
220 | MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>"); | |
221 | MODULE_LICENSE("GPL"); |