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 pcap_rtc *pcap_rtc = dev_get_drvdata(dev); 47 struct rtc_time *tm = &alrm->time; 48 unsigned long secs; 49 u32 tod; /* time of day, seconds since midnight */ 50 u32 days; /* days since 1/1/1970 */ 51 52 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod); 53 secs = tod & PCAP_RTC_TOD_MASK; 54 55 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days); 56 secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY; 57 58 rtc_time_to_tm(secs, tm); 59 60 return 0; 61 } 62 63 static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 64 { 65 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); 66 struct rtc_time *tm = &alrm->time; 67 unsigned long secs; 68 u32 tod, days; 69 70 rtc_tm_to_time(tm, &secs); 71 72 tod = secs % SEC_PER_DAY; 73 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod); 74 75 days = secs / SEC_PER_DAY; 76 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days); 77 78 return 0; 79 } 80 81 static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm) 82 { 83 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); 84 unsigned long secs; 85 u32 tod, days; 86 87 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod); 88 secs = tod & PCAP_RTC_TOD_MASK; 89 90 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days); 91 secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY; 92 93 rtc_time_to_tm(secs, tm); 94 95 return 0; 96 } 97 98 static int pcap_rtc_set_mmss(struct device *dev, unsigned long secs) 99 { 100 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); 101 u32 tod, days; 102 103 tod = secs % SEC_PER_DAY; 104 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod); 105 106 days = secs / SEC_PER_DAY; 107 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days); 108 109 return 0; 110 } 111 112 static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en) 113 { 114 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); 115 116 if (en) 117 enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq)); 118 else 119 disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq)); 120 121 return 0; 122 } 123 124 static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en) 125 { 126 return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en); 127 } 128 129 static const struct rtc_class_ops pcap_rtc_ops = { 130 .read_time = pcap_rtc_read_time, 131 .read_alarm = pcap_rtc_read_alarm, 132 .set_alarm = pcap_rtc_set_alarm, 133 .set_mmss = pcap_rtc_set_mmss, 134 .alarm_irq_enable = pcap_rtc_alarm_irq_enable, 135 }; 136 137 static int __init pcap_rtc_probe(struct platform_device *pdev) 138 { 139 struct pcap_rtc *pcap_rtc; 140 int timer_irq, alarm_irq; 141 int err = -ENOMEM; 142 143 pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc), 144 GFP_KERNEL); 145 if (!pcap_rtc) 146 return err; 147 148 pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent); 149 150 platform_set_drvdata(pdev, pcap_rtc); 151 152 pcap_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pcap", 153 &pcap_rtc_ops, THIS_MODULE); 154 if (IS_ERR(pcap_rtc->rtc)) 155 return PTR_ERR(pcap_rtc->rtc); 156 157 timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ); 158 alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA); 159 160 err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0, 161 "RTC Timer", pcap_rtc); 162 if (err) 163 return err; 164 165 err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0, 166 "RTC Alarm", pcap_rtc); 167 if (err) 168 return err; 169 170 return 0; 171 } 172 173 static int __exit pcap_rtc_remove(struct platform_device *pdev) 174 { 175 return 0; 176 } 177 178 static struct platform_driver pcap_rtc_driver = { 179 .remove = __exit_p(pcap_rtc_remove), 180 .driver = { 181 .name = "pcap-rtc", 182 }, 183 }; 184 185 module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe); 186 187 MODULE_DESCRIPTION("Motorola pcap rtc driver"); 188 MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>"); 189 MODULE_LICENSE("GPL"); 190