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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Real time clock driver for DA90554 *5 * Copyright(c) 2012 Dialog Semiconductor Ltd.6 *7 * Author: Dajun Dajun Chen <dajun.chen@diasemi.com>8 */9 10#include <linux/module.h>11#include <linux/platform_device.h>12#include <linux/rtc.h>13 14#include <linux/mfd/da9055/core.h>15#include <linux/mfd/da9055/reg.h>16#include <linux/mfd/da9055/pdata.h>17 18struct da9055_rtc {19 struct rtc_device *rtc;20 struct da9055 *da9055;21 int alarm_enable;22};23 24static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)25{26 int ret;27 if (enable) {28 ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,29 DA9055_RTC_ALM_EN,30 DA9055_RTC_ALM_EN);31 if (ret != 0)32 dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",33 ret);34 rtc->alarm_enable = 1;35 } else {36 ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,37 DA9055_RTC_ALM_EN, 0);38 if (ret != 0)39 dev_err(rtc->da9055->dev,40 "Failed to disable ALM: %d\n", ret);41 rtc->alarm_enable = 0;42 }43 return ret;44}45 46static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)47{48 struct da9055_rtc *rtc = data;49 50 da9055_rtc_enable_alarm(rtc, 0);51 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);52 53 return IRQ_HANDLED;54}55 56static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)57{58 int ret;59 uint8_t v[5];60 61 ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);62 if (ret != 0) {63 dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);64 return ret;65 }66 67 rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;68 rtc_tm->tm_mon = (v[3] & DA9055_RTC_ALM_MONTH) - 1;69 rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;70 rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;71 rtc_tm->tm_min = v[0] & DA9055_RTC_ALM_MIN;72 rtc_tm->tm_sec = 0;73 74 return rtc_valid_tm(rtc_tm);75}76 77static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)78{79 int ret;80 uint8_t v[2];81 82 rtc_tm->tm_year -= 100;83 rtc_tm->tm_mon += 1;84 85 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,86 DA9055_RTC_ALM_MIN, rtc_tm->tm_min);87 if (ret != 0) {88 dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);89 return ret;90 }91 92 v[0] = rtc_tm->tm_hour;93 v[1] = rtc_tm->tm_mday;94 95 ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);96 if (ret < 0)97 return ret;98 99 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,100 DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);101 if (ret < 0)102 dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);103 104 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,105 DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);106 if (ret < 0)107 dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);108 109 return ret;110}111 112static int da9055_rtc_get_alarm_status(struct da9055 *da9055)113{114 int ret;115 116 ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);117 if (ret < 0) {118 dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);119 return ret;120 }121 ret &= DA9055_RTC_ALM_EN;122 return (ret > 0) ? 1 : 0;123}124 125static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)126{127 struct da9055_rtc *rtc = dev_get_drvdata(dev);128 uint8_t v[6];129 int ret;130 131 ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);132 if (ret < 0)133 return ret;134 135 /*136 * Registers are only valid when RTC_READ137 * status bit is asserted138 */139 if (!(ret & DA9055_RTC_READ))140 return -EBUSY;141 142 ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);143 if (ret < 0) {144 dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",145 ret);146 return ret;147 }148 149 rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;150 rtc_tm->tm_mon = (v[4] & DA9055_RTC_MONTH) - 1;151 rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;152 rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;153 rtc_tm->tm_min = v[1] & DA9055_RTC_MIN;154 rtc_tm->tm_sec = v[0] & DA9055_RTC_SEC;155 156 return 0;157}158 159static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm)160{161 struct da9055_rtc *rtc;162 uint8_t v[6];163 164 rtc = dev_get_drvdata(dev);165 166 v[0] = tm->tm_sec;167 v[1] = tm->tm_min;168 v[2] = tm->tm_hour;169 v[3] = tm->tm_mday;170 v[4] = tm->tm_mon + 1;171 v[5] = tm->tm_year - 100;172 173 return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);174}175 176static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)177{178 int ret;179 struct rtc_time *tm = &alrm->time;180 struct da9055_rtc *rtc = dev_get_drvdata(dev);181 182 ret = da9055_read_alarm(rtc->da9055, tm);183 184 if (ret)185 return ret;186 187 alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);188 189 return 0;190}191 192static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)193{194 int ret;195 struct rtc_time *tm = &alrm->time;196 struct da9055_rtc *rtc = dev_get_drvdata(dev);197 198 ret = da9055_rtc_enable_alarm(rtc, 0);199 if (ret < 0)200 return ret;201 202 ret = da9055_set_alarm(rtc->da9055, tm);203 if (ret)204 return ret;205 206 ret = da9055_rtc_enable_alarm(rtc, 1);207 208 return ret;209}210 211static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)212{213 struct da9055_rtc *rtc = dev_get_drvdata(dev);214 215 return da9055_rtc_enable_alarm(rtc, enabled);216}217 218static const struct rtc_class_ops da9055_rtc_ops = {219 .read_time = da9055_rtc_read_time,220 .set_time = da9055_rtc_set_time,221 .read_alarm = da9055_rtc_read_alarm,222 .set_alarm = da9055_rtc_set_alarm,223 .alarm_irq_enable = da9055_rtc_alarm_irq_enable,224};225 226static int da9055_rtc_device_init(struct da9055 *da9055,227 struct da9055_pdata *pdata)228{229 int ret;230 231 /* Enable RTC and the internal Crystal */232 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,233 DA9055_RTC_EN, DA9055_RTC_EN);234 if (ret < 0)235 return ret;236 ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,237 DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);238 if (ret < 0)239 return ret;240 241 /* Enable RTC in Power Down mode */242 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,243 DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);244 if (ret < 0)245 return ret;246 247 /* Enable RTC in Reset mode */248 if (pdata && pdata->reset_enable) {249 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,250 DA9055_RTC_MODE_SD,251 DA9055_RTC_MODE_SD <<252 DA9055_RTC_MODE_SD_SHIFT);253 if (ret < 0)254 return ret;255 }256 257 /* Disable the RTC TICK ALM */258 ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,259 DA9055_RTC_TICK_WAKE_MASK, 0);260 if (ret < 0)261 return ret;262 263 return 0;264}265 266static int da9055_rtc_probe(struct platform_device *pdev)267{268 struct da9055_rtc *rtc;269 struct da9055_pdata *pdata = NULL;270 int ret, alm_irq;271 272 rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);273 if (!rtc)274 return -ENOMEM;275 276 rtc->da9055 = dev_get_drvdata(pdev->dev.parent);277 pdata = dev_get_platdata(rtc->da9055->dev);278 platform_set_drvdata(pdev, rtc);279 280 ret = da9055_rtc_device_init(rtc->da9055, pdata);281 if (ret < 0)282 goto err_rtc;283 284 ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);285 if (ret < 0)286 goto err_rtc;287 288 if (ret & DA9055_RTC_ALM_EN)289 rtc->alarm_enable = 1;290 291 device_init_wakeup(&pdev->dev, 1);292 293 rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,294 &da9055_rtc_ops, THIS_MODULE);295 if (IS_ERR(rtc->rtc)) {296 ret = PTR_ERR(rtc->rtc);297 goto err_rtc;298 }299 300 alm_irq = platform_get_irq_byname(pdev, "ALM");301 if (alm_irq < 0)302 return alm_irq;303 304 ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,305 da9055_rtc_alm_irq,306 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,307 "ALM", rtc);308 if (ret != 0)309 dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);310 311err_rtc:312 return ret;313 314}315 316#ifdef CONFIG_PM317/* Turn off the alarm if it should not be a wake source. */318static int da9055_rtc_suspend(struct device *dev)319{320 struct platform_device *pdev = to_platform_device(dev);321 struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);322 int ret;323 324 if (!device_may_wakeup(&pdev->dev)) {325 /* Disable the ALM IRQ */326 ret = da9055_rtc_enable_alarm(rtc, 0);327 if (ret < 0)328 dev_err(&pdev->dev, "Failed to disable RTC ALM\n");329 }330 331 return 0;332}333 334/* Enable the alarm if it should be enabled (in case it was disabled to335 * prevent use as a wake source).336 */337static int da9055_rtc_resume(struct device *dev)338{339 struct platform_device *pdev = to_platform_device(dev);340 struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);341 int ret;342 343 if (!device_may_wakeup(&pdev->dev)) {344 if (rtc->alarm_enable) {345 ret = da9055_rtc_enable_alarm(rtc, 1);346 if (ret < 0)347 dev_err(&pdev->dev,348 "Failed to restart RTC ALM\n");349 }350 }351 352 return 0;353}354 355/* Unconditionally disable the alarm */356static int da9055_rtc_freeze(struct device *dev)357{358 struct platform_device *pdev = to_platform_device(dev);359 struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);360 int ret;361 362 ret = da9055_rtc_enable_alarm(rtc, 0);363 if (ret < 0)364 dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");365 366 return 0;367 368}369#else370#define da9055_rtc_suspend NULL371#define da9055_rtc_resume NULL372#define da9055_rtc_freeze NULL373#endif374 375static const struct dev_pm_ops da9055_rtc_pm_ops = {376 .suspend = da9055_rtc_suspend,377 .resume = da9055_rtc_resume,378 379 .freeze = da9055_rtc_freeze,380 .thaw = da9055_rtc_resume,381 .restore = da9055_rtc_resume,382 383 .poweroff = da9055_rtc_suspend,384};385 386static struct platform_driver da9055_rtc_driver = {387 .probe = da9055_rtc_probe,388 .driver = {389 .name = "da9055-rtc",390 .pm = &da9055_rtc_pm_ops,391 },392};393 394module_platform_driver(da9055_rtc_driver);395 396MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");397MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");398MODULE_LICENSE("GPL");399MODULE_ALIAS("platform:da9055-rtc");400