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1// SPDX-License-Identifier: GPL-2.0-or-later2/* NXP PCF50633 RTC Driver3 *4 * (C) 2006-2008 by Openmoko, Inc.5 * Author: Balaji Rao <balajirrao@openmoko.org>6 * All rights reserved.7 *8 * Broken down from monstrous PCF50633 driver mainly by9 * Harald Welte, Andy Green and Werner Almesberger10 */11 12#include <linux/kernel.h>13#include <linux/module.h>14#include <linux/init.h>15#include <linux/device.h>16#include <linux/slab.h>17#include <linux/platform_device.h>18#include <linux/rtc.h>19#include <linux/bcd.h>20#include <linux/err.h>21 22#include <linux/mfd/pcf50633/core.h>23 24#define PCF50633_REG_RTCSC 0x59 /* Second */25#define PCF50633_REG_RTCMN 0x5a /* Minute */26#define PCF50633_REG_RTCHR 0x5b /* Hour */27#define PCF50633_REG_RTCWD 0x5c /* Weekday */28#define PCF50633_REG_RTCDT 0x5d /* Day */29#define PCF50633_REG_RTCMT 0x5e /* Month */30#define PCF50633_REG_RTCYR 0x5f /* Year */31#define PCF50633_REG_RTCSCA 0x60 /* Alarm Second */32#define PCF50633_REG_RTCMNA 0x61 /* Alarm Minute */33#define PCF50633_REG_RTCHRA 0x62 /* Alarm Hour */34#define PCF50633_REG_RTCWDA 0x63 /* Alarm Weekday */35#define PCF50633_REG_RTCDTA 0x64 /* Alarm Day */36#define PCF50633_REG_RTCMTA 0x65 /* Alarm Month */37#define PCF50633_REG_RTCYRA 0x66 /* Alarm Year */38 39enum pcf50633_time_indexes {40 PCF50633_TI_SEC,41 PCF50633_TI_MIN,42 PCF50633_TI_HOUR,43 PCF50633_TI_WKDAY,44 PCF50633_TI_DAY,45 PCF50633_TI_MONTH,46 PCF50633_TI_YEAR,47 PCF50633_TI_EXTENT /* always last */48};49 50struct pcf50633_time {51 u_int8_t time[PCF50633_TI_EXTENT];52};53 54struct pcf50633_rtc {55 int alarm_enabled;56 int alarm_pending;57 58 struct pcf50633 *pcf;59 struct rtc_device *rtc_dev;60};61 62static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)63{64 rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);65 rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);66 rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);67 rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);68 rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);69 rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;70 rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;71}72 73static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)74{75 pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);76 pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);77 pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);78 pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);79 pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);80 pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);81 pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);82}83 84static int85pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)86{87 struct pcf50633_rtc *rtc = dev_get_drvdata(dev);88 int err;89 90 if (enabled)91 err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);92 else93 err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);94 95 if (err < 0)96 return err;97 98 rtc->alarm_enabled = enabled;99 100 return 0;101}102 103static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)104{105 struct pcf50633_rtc *rtc;106 struct pcf50633_time pcf_tm;107 int ret;108 109 rtc = dev_get_drvdata(dev);110 111 ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,112 PCF50633_TI_EXTENT,113 &pcf_tm.time[0]);114 if (ret != PCF50633_TI_EXTENT) {115 dev_err(dev, "Failed to read time\n");116 return -EIO;117 }118 119 dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",120 pcf_tm.time[PCF50633_TI_DAY],121 pcf_tm.time[PCF50633_TI_MONTH],122 pcf_tm.time[PCF50633_TI_YEAR],123 pcf_tm.time[PCF50633_TI_HOUR],124 pcf_tm.time[PCF50633_TI_MIN],125 pcf_tm.time[PCF50633_TI_SEC]);126 127 pcf2rtc_time(tm, &pcf_tm);128 129 dev_dbg(dev, "RTC_TIME: %ptRr\n", tm);130 131 return 0;132}133 134static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)135{136 struct pcf50633_rtc *rtc;137 struct pcf50633_time pcf_tm;138 int alarm_masked, ret = 0;139 140 rtc = dev_get_drvdata(dev);141 142 dev_dbg(dev, "RTC_TIME: %ptRr\n", tm);143 144 rtc2pcf_time(&pcf_tm, tm);145 146 dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",147 pcf_tm.time[PCF50633_TI_DAY],148 pcf_tm.time[PCF50633_TI_MONTH],149 pcf_tm.time[PCF50633_TI_YEAR],150 pcf_tm.time[PCF50633_TI_HOUR],151 pcf_tm.time[PCF50633_TI_MIN],152 pcf_tm.time[PCF50633_TI_SEC]);153 154 155 alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);156 157 if (!alarm_masked)158 pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);159 160 /* Returns 0 on success */161 ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,162 PCF50633_TI_EXTENT,163 &pcf_tm.time[0]);164 165 if (!alarm_masked)166 pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);167 168 return ret;169}170 171static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)172{173 struct pcf50633_rtc *rtc;174 struct pcf50633_time pcf_tm;175 int ret = 0;176 177 rtc = dev_get_drvdata(dev);178 179 alrm->enabled = rtc->alarm_enabled;180 alrm->pending = rtc->alarm_pending;181 182 ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,183 PCF50633_TI_EXTENT, &pcf_tm.time[0]);184 if (ret != PCF50633_TI_EXTENT) {185 dev_err(dev, "Failed to read time\n");186 return -EIO;187 }188 189 pcf2rtc_time(&alrm->time, &pcf_tm);190 191 return rtc_valid_tm(&alrm->time);192}193 194static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)195{196 struct pcf50633_rtc *rtc;197 struct pcf50633_time pcf_tm;198 int alarm_masked, ret = 0;199 200 rtc = dev_get_drvdata(dev);201 202 rtc2pcf_time(&pcf_tm, &alrm->time);203 204 /* do like mktime does and ignore tm_wday */205 pcf_tm.time[PCF50633_TI_WKDAY] = 7;206 207 alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);208 209 /* disable alarm interrupt */210 if (!alarm_masked)211 pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);212 213 /* Returns 0 on success */214 ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,215 PCF50633_TI_EXTENT, &pcf_tm.time[0]);216 if (!alrm->enabled)217 rtc->alarm_pending = 0;218 219 if (!alarm_masked || alrm->enabled)220 pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);221 rtc->alarm_enabled = alrm->enabled;222 223 return ret;224}225 226static const struct rtc_class_ops pcf50633_rtc_ops = {227 .read_time = pcf50633_rtc_read_time,228 .set_time = pcf50633_rtc_set_time,229 .read_alarm = pcf50633_rtc_read_alarm,230 .set_alarm = pcf50633_rtc_set_alarm,231 .alarm_irq_enable = pcf50633_rtc_alarm_irq_enable,232};233 234static void pcf50633_rtc_irq(int irq, void *data)235{236 struct pcf50633_rtc *rtc = data;237 238 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);239 rtc->alarm_pending = 1;240}241 242static int pcf50633_rtc_probe(struct platform_device *pdev)243{244 struct pcf50633_rtc *rtc;245 246 rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);247 if (!rtc)248 return -ENOMEM;249 250 rtc->pcf = dev_to_pcf50633(pdev->dev.parent);251 platform_set_drvdata(pdev, rtc);252 rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "pcf50633-rtc",253 &pcf50633_rtc_ops, THIS_MODULE);254 255 if (IS_ERR(rtc->rtc_dev))256 return PTR_ERR(rtc->rtc_dev);257 258 pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,259 pcf50633_rtc_irq, rtc);260 return 0;261}262 263static void pcf50633_rtc_remove(struct platform_device *pdev)264{265 struct pcf50633_rtc *rtc;266 267 rtc = platform_get_drvdata(pdev);268 pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);269}270 271static struct platform_driver pcf50633_rtc_driver = {272 .driver = {273 .name = "pcf50633-rtc",274 },275 .probe = pcf50633_rtc_probe,276 .remove_new = pcf50633_rtc_remove,277};278 279module_platform_driver(pcf50633_rtc_driver);280 281MODULE_DESCRIPTION("PCF50633 RTC driver");282MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");283MODULE_LICENSE("GPL");284 285