405 строки
9.3 KiB
C
405 строки
9.3 KiB
C
/*
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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 <dajun.chen@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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 rtc_valid_tm(rtc_tm);
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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 <dchen@diasemi.com>");
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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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