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 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; /* 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 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 int pcap_rtc_update_irq_enable(struct device *dev, unsigned int en) 135{ 136 return pcap_rtc_irq_enable(dev, PCAP_IRQ_1HZ, en); 137} 138 139static const struct rtc_class_ops pcap_rtc_ops = { 140 .read_time = pcap_rtc_read_time, 141 .read_alarm = pcap_rtc_read_alarm, 142 .set_alarm = pcap_rtc_set_alarm, 143 .set_mmss = pcap_rtc_set_mmss, 144 .alarm_irq_enable = pcap_rtc_alarm_irq_enable, 145 .update_irq_enable = pcap_rtc_update_irq_enable, 146}; 147 148static int __devinit pcap_rtc_probe(struct platform_device *pdev) 149{ 150 struct pcap_rtc *pcap_rtc; 151 int timer_irq, alarm_irq; 152 int err = -ENOMEM; 153 154 pcap_rtc = kmalloc(sizeof(struct pcap_rtc), GFP_KERNEL); 155 if (!pcap_rtc) 156 return err; 157 158 pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent); 159 160 pcap_rtc->rtc = rtc_device_register("pcap", &pdev->dev, 161 &pcap_rtc_ops, THIS_MODULE); 162 if (IS_ERR(pcap_rtc->rtc)) { 163 err = PTR_ERR(pcap_rtc->rtc); 164 goto fail_rtc; 165 } 166 167 platform_set_drvdata(pdev, pcap_rtc); 168 169 timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ); 170 alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA); 171 172 err = request_irq(timer_irq, pcap_rtc_irq, 0, "RTC Timer", pcap_rtc); 173 if (err) 174 goto fail_timer; 175 176 err = request_irq(alarm_irq, pcap_rtc_irq, 0, "RTC Alarm", pcap_rtc); 177 if (err) 178 goto fail_alarm; 179 180 return 0; 181fail_alarm: 182 free_irq(timer_irq, pcap_rtc); 183fail_timer: 184 rtc_device_unregister(pcap_rtc->rtc); 185fail_rtc: 186 kfree(pcap_rtc); 187 return err; 188} 189 190static int __devexit pcap_rtc_remove(struct platform_device *pdev) 191{ 192 struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); 193 194 free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ), pcap_rtc); 195 free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA), pcap_rtc); 196 rtc_device_unregister(pcap_rtc->rtc); 197 kfree(pcap_rtc); 198 199 return 0; 200} 201 202static struct platform_driver pcap_rtc_driver = { 203 .remove = __devexit_p(pcap_rtc_remove), 204 .driver = { 205 .name = "pcap-rtc", 206 .owner = THIS_MODULE, 207 }, 208}; 209 210static int __init rtc_pcap_init(void) 211{ 212 return platform_driver_probe(&pcap_rtc_driver, pcap_rtc_probe); 213} 214 215static void __exit rtc_pcap_exit(void) 216{ 217 platform_driver_unregister(&pcap_rtc_driver); 218} 219 220module_init(rtc_pcap_init); 221module_exit(rtc_pcap_exit); 222 223MODULE_DESCRIPTION("Motorola pcap rtc driver"); 224MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>"); 225MODULE_LICENSE("GPL"); 226