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399 lines
9.1 KiB
399 lines
9.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Real time clock driver for DA9055 |
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* |
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* Copyright(c) 2012 Dialog Semiconductor Ltd. |
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* |
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* Author: Dajun Dajun Chen <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/rtc.h> |
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#include <linux/mfd/da9055/core.h> |
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#include <linux/mfd/da9055/reg.h> |
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#include <linux/mfd/da9055/pdata.h> |
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struct da9055_rtc { |
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struct rtc_device *rtc; |
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struct da9055 *da9055; |
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int alarm_enable; |
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}; |
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static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable) |
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{ |
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int ret; |
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if (enable) { |
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ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y, |
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DA9055_RTC_ALM_EN, |
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DA9055_RTC_ALM_EN); |
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if (ret != 0) |
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dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n", |
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ret); |
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rtc->alarm_enable = 1; |
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} else { |
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ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y, |
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DA9055_RTC_ALM_EN, 0); |
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if (ret != 0) |
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dev_err(rtc->da9055->dev, |
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"Failed to disable ALM: %d\n", ret); |
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rtc->alarm_enable = 0; |
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} |
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return ret; |
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} |
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static irqreturn_t da9055_rtc_alm_irq(int irq, void *data) |
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{ |
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struct da9055_rtc *rtc = data; |
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da9055_rtc_enable_alarm(rtc, 0); |
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rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); |
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return IRQ_HANDLED; |
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} |
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static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm) |
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{ |
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int ret; |
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uint8_t v[5]; |
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ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v); |
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if (ret != 0) { |
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dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret); |
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return ret; |
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} |
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rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100; |
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rtc_tm->tm_mon = (v[3] & DA9055_RTC_ALM_MONTH) - 1; |
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rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY; |
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rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR; |
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rtc_tm->tm_min = v[0] & DA9055_RTC_ALM_MIN; |
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rtc_tm->tm_sec = 0; |
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return rtc_valid_tm(rtc_tm); |
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} |
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static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm) |
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{ |
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int ret; |
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uint8_t v[2]; |
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rtc_tm->tm_year -= 100; |
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rtc_tm->tm_mon += 1; |
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ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI, |
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DA9055_RTC_ALM_MIN, rtc_tm->tm_min); |
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if (ret != 0) { |
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dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret); |
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return ret; |
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} |
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v[0] = rtc_tm->tm_hour; |
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v[1] = rtc_tm->tm_mday; |
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ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v); |
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if (ret < 0) |
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return ret; |
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ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO, |
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DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon); |
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if (ret < 0) |
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dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret); |
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ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y, |
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DA9055_RTC_ALM_YEAR, rtc_tm->tm_year); |
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if (ret < 0) |
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dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret); |
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return ret; |
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} |
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static int da9055_rtc_get_alarm_status(struct da9055 *da9055) |
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{ |
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int ret; |
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ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y); |
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if (ret < 0) { |
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dev_err(da9055->dev, "Failed to read ALM: %d\n", ret); |
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return ret; |
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} |
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ret &= DA9055_RTC_ALM_EN; |
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return (ret > 0) ? 1 : 0; |
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} |
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static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) |
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{ |
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struct da9055_rtc *rtc = dev_get_drvdata(dev); |
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uint8_t v[6]; |
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int ret; |
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ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S); |
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if (ret < 0) |
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return ret; |
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/* |
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* Registers are only valid when RTC_READ |
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* status bit is asserted |
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*/ |
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if (!(ret & DA9055_RTC_READ)) |
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return -EBUSY; |
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ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v); |
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if (ret < 0) { |
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dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n", |
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ret); |
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return ret; |
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} |
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rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100; |
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rtc_tm->tm_mon = (v[4] & DA9055_RTC_MONTH) - 1; |
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rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY; |
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rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR; |
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rtc_tm->tm_min = v[1] & DA9055_RTC_MIN; |
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rtc_tm->tm_sec = v[0] & DA9055_RTC_SEC; |
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return 0; |
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} |
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static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct da9055_rtc *rtc; |
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uint8_t v[6]; |
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rtc = dev_get_drvdata(dev); |
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v[0] = tm->tm_sec; |
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v[1] = tm->tm_min; |
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v[2] = tm->tm_hour; |
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v[3] = tm->tm_mday; |
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v[4] = tm->tm_mon + 1; |
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v[5] = tm->tm_year - 100; |
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return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v); |
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} |
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static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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int ret; |
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struct rtc_time *tm = &alrm->time; |
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struct da9055_rtc *rtc = dev_get_drvdata(dev); |
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ret = da9055_read_alarm(rtc->da9055, tm); |
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if (ret) |
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return ret; |
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alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055); |
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return 0; |
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} |
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static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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int ret; |
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struct rtc_time *tm = &alrm->time; |
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struct da9055_rtc *rtc = dev_get_drvdata(dev); |
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ret = da9055_rtc_enable_alarm(rtc, 0); |
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if (ret < 0) |
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return ret; |
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ret = da9055_set_alarm(rtc->da9055, tm); |
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if (ret) |
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return ret; |
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ret = da9055_rtc_enable_alarm(rtc, 1); |
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return ret; |
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} |
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static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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struct da9055_rtc *rtc = dev_get_drvdata(dev); |
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return da9055_rtc_enable_alarm(rtc, enabled); |
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} |
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static const struct rtc_class_ops da9055_rtc_ops = { |
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.read_time = da9055_rtc_read_time, |
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.set_time = da9055_rtc_set_time, |
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.read_alarm = da9055_rtc_read_alarm, |
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.set_alarm = da9055_rtc_set_alarm, |
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.alarm_irq_enable = da9055_rtc_alarm_irq_enable, |
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}; |
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static int da9055_rtc_device_init(struct da9055 *da9055, |
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struct da9055_pdata *pdata) |
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{ |
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int ret; |
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/* Enable RTC and the internal Crystal */ |
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ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, |
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DA9055_RTC_EN, DA9055_RTC_EN); |
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if (ret < 0) |
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return ret; |
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ret = da9055_reg_update(da9055, DA9055_REG_EN_32K, |
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DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN); |
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if (ret < 0) |
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return ret; |
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/* Enable RTC in Power Down mode */ |
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ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, |
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DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD); |
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if (ret < 0) |
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return ret; |
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/* Enable RTC in Reset mode */ |
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if (pdata && pdata->reset_enable) { |
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ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, |
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DA9055_RTC_MODE_SD, |
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DA9055_RTC_MODE_SD << |
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DA9055_RTC_MODE_SD_SHIFT); |
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if (ret < 0) |
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return ret; |
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} |
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/* Disable the RTC TICK ALM */ |
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ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO, |
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DA9055_RTC_TICK_WAKE_MASK, 0); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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static int da9055_rtc_probe(struct platform_device *pdev) |
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{ |
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struct da9055_rtc *rtc; |
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struct da9055_pdata *pdata = NULL; |
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int ret, alm_irq; |
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rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL); |
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if (!rtc) |
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return -ENOMEM; |
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rtc->da9055 = dev_get_drvdata(pdev->dev.parent); |
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pdata = dev_get_platdata(rtc->da9055->dev); |
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platform_set_drvdata(pdev, rtc); |
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ret = da9055_rtc_device_init(rtc->da9055, pdata); |
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if (ret < 0) |
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goto err_rtc; |
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ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y); |
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if (ret < 0) |
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goto err_rtc; |
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if (ret & DA9055_RTC_ALM_EN) |
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rtc->alarm_enable = 1; |
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device_init_wakeup(&pdev->dev, 1); |
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rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
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&da9055_rtc_ops, THIS_MODULE); |
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if (IS_ERR(rtc->rtc)) { |
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ret = PTR_ERR(rtc->rtc); |
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goto err_rtc; |
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} |
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alm_irq = platform_get_irq_byname(pdev, "ALM"); |
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if (alm_irq < 0) |
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return alm_irq; |
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ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL, |
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da9055_rtc_alm_irq, |
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IRQF_TRIGGER_HIGH | IRQF_ONESHOT, |
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"ALM", rtc); |
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if (ret != 0) |
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dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret); |
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err_rtc: |
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return ret; |
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} |
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#ifdef CONFIG_PM |
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/* Turn off the alarm if it should not be a wake source. */ |
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static int da9055_rtc_suspend(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); |
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int ret; |
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if (!device_may_wakeup(&pdev->dev)) { |
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/* Disable the ALM IRQ */ |
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ret = da9055_rtc_enable_alarm(rtc, 0); |
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if (ret < 0) |
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dev_err(&pdev->dev, "Failed to disable RTC ALM\n"); |
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} |
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return 0; |
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} |
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/* Enable the alarm if it should be enabled (in case it was disabled to |
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* prevent use as a wake source). |
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*/ |
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static int da9055_rtc_resume(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); |
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int ret; |
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if (!device_may_wakeup(&pdev->dev)) { |
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if (rtc->alarm_enable) { |
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ret = da9055_rtc_enable_alarm(rtc, 1); |
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if (ret < 0) |
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dev_err(&pdev->dev, |
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"Failed to restart RTC ALM\n"); |
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} |
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} |
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return 0; |
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} |
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/* Unconditionally disable the alarm */ |
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static int da9055_rtc_freeze(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev); |
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int ret; |
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ret = da9055_rtc_enable_alarm(rtc, 0); |
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if (ret < 0) |
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dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n"); |
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return 0; |
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} |
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#else |
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#define da9055_rtc_suspend NULL |
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#define da9055_rtc_resume NULL |
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#define da9055_rtc_freeze NULL |
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#endif |
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static const struct dev_pm_ops da9055_rtc_pm_ops = { |
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.suspend = da9055_rtc_suspend, |
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.resume = da9055_rtc_resume, |
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.freeze = da9055_rtc_freeze, |
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.thaw = da9055_rtc_resume, |
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.restore = da9055_rtc_resume, |
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.poweroff = da9055_rtc_suspend, |
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}; |
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static struct platform_driver da9055_rtc_driver = { |
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.probe = da9055_rtc_probe, |
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.driver = { |
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.name = "da9055-rtc", |
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.pm = &da9055_rtc_pm_ops, |
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}, |
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}; |
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module_platform_driver(da9055_rtc_driver); |
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MODULE_AUTHOR("David Dajun Chen <[email protected]>"); |
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MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:da9055-rtc");
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