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Linux/drivers/rtc/rtc-pcap.c

  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 
 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 
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,
140 };
141 
142 static 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 
178 static int __exit pcap_rtc_remove(struct platform_device *pdev)
179 {
180         return 0;
181 }
182 
183 static struct platform_driver pcap_rtc_driver = {
184         .remove = __exit_p(pcap_rtc_remove),
185         .driver = {
186                 .name  = "pcap-rtc",
187                 .owner = THIS_MODULE,
188         },
189 };
190 
191 module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);
192 
193 MODULE_DESCRIPTION("Motorola pcap rtc driver");
194 MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
195 MODULE_LICENSE("GPL");
196 

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