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312 lines
7.9 KiB
312 lines
7.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* rtc-rc5t583.c -- RICOH RC5T583 Real Time Clock |
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* |
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. |
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* Author: Venu Byravarasu <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/rtc.h> |
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#include <linux/bcd.h> |
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#include <linux/platform_device.h> |
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#include <linux/interrupt.h> |
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#include <linux/mfd/rc5t583.h> |
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struct rc5t583_rtc { |
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struct rtc_device *rtc; |
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/* To store the list of enabled interrupts, during system suspend */ |
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u32 irqen; |
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}; |
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/* Total number of RTC registers needed to set time*/ |
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#define NUM_TIME_REGS (RC5T583_RTC_YEAR - RC5T583_RTC_SEC + 1) |
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/* Total number of RTC registers needed to set Y-Alarm*/ |
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#define NUM_YAL_REGS (RC5T583_RTC_AY_YEAR - RC5T583_RTC_AY_MIN + 1) |
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/* Set Y-Alarm interrupt */ |
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#define SET_YAL BIT(5) |
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/* Get Y-Alarm interrupt status*/ |
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#define GET_YAL_STATUS BIT(3) |
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static int rc5t583_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) |
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{ |
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); |
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u8 val; |
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/* Set Y-Alarm, based on 'enabled' */ |
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val = enabled ? SET_YAL : 0; |
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return regmap_update_bits(rc5t583->regmap, RC5T583_RTC_CTL1, SET_YAL, |
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val); |
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} |
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/* |
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* Gets current rc5t583 RTC time and date parameters. |
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* |
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* The RTC's time/alarm representation is not what gmtime(3) requires |
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* Linux to use: |
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* |
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* - Months are 1..12 vs Linux 0-11 |
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* - Years are 0..99 vs Linux 1900..N (we assume 21st century) |
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*/ |
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static int rc5t583_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); |
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u8 rtc_data[NUM_TIME_REGS]; |
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int ret; |
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ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data, |
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NUM_TIME_REGS); |
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if (ret < 0) { |
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dev_err(dev, "RTC read time failed with err:%d\n", ret); |
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return ret; |
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} |
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tm->tm_sec = bcd2bin(rtc_data[0]); |
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tm->tm_min = bcd2bin(rtc_data[1]); |
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tm->tm_hour = bcd2bin(rtc_data[2]); |
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tm->tm_wday = bcd2bin(rtc_data[3]); |
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tm->tm_mday = bcd2bin(rtc_data[4]); |
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tm->tm_mon = bcd2bin(rtc_data[5]) - 1; |
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tm->tm_year = bcd2bin(rtc_data[6]) + 100; |
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return ret; |
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} |
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static int rc5t583_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); |
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unsigned char rtc_data[NUM_TIME_REGS]; |
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int ret; |
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rtc_data[0] = bin2bcd(tm->tm_sec); |
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rtc_data[1] = bin2bcd(tm->tm_min); |
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rtc_data[2] = bin2bcd(tm->tm_hour); |
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rtc_data[3] = bin2bcd(tm->tm_wday); |
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rtc_data[4] = bin2bcd(tm->tm_mday); |
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rtc_data[5] = bin2bcd(tm->tm_mon + 1); |
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rtc_data[6] = bin2bcd(tm->tm_year - 100); |
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ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data, |
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NUM_TIME_REGS); |
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if (ret < 0) { |
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dev_err(dev, "RTC set time failed with error %d\n", ret); |
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return ret; |
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} |
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return ret; |
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} |
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static int rc5t583_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
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{ |
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); |
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unsigned char alarm_data[NUM_YAL_REGS]; |
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u32 interrupt_enable; |
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int ret; |
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ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data, |
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NUM_YAL_REGS); |
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if (ret < 0) { |
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dev_err(dev, "rtc_read_alarm error %d\n", ret); |
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return ret; |
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} |
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alm->time.tm_sec = 0; |
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alm->time.tm_min = bcd2bin(alarm_data[0]); |
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alm->time.tm_hour = bcd2bin(alarm_data[1]); |
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alm->time.tm_mday = bcd2bin(alarm_data[2]); |
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alm->time.tm_mon = bcd2bin(alarm_data[3]) - 1; |
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alm->time.tm_year = bcd2bin(alarm_data[4]) + 100; |
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ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, &interrupt_enable); |
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if (ret < 0) |
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return ret; |
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/* check if YALE is set */ |
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if (interrupt_enable & SET_YAL) |
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alm->enabled = 1; |
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return ret; |
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} |
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static int rc5t583_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) |
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{ |
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); |
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unsigned char alarm_data[NUM_YAL_REGS]; |
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int ret; |
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ret = rc5t583_rtc_alarm_irq_enable(dev, 0); |
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if (ret) |
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return ret; |
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alarm_data[0] = bin2bcd(alm->time.tm_min); |
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alarm_data[1] = bin2bcd(alm->time.tm_hour); |
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alarm_data[2] = bin2bcd(alm->time.tm_mday); |
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alarm_data[3] = bin2bcd(alm->time.tm_mon + 1); |
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alarm_data[4] = bin2bcd(alm->time.tm_year - 100); |
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ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data, |
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NUM_YAL_REGS); |
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if (ret) { |
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dev_err(dev, "rtc_set_alarm error %d\n", ret); |
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return ret; |
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} |
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if (alm->enabled) |
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ret = rc5t583_rtc_alarm_irq_enable(dev, 1); |
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return ret; |
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} |
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static irqreturn_t rc5t583_rtc_interrupt(int irq, void *rtc) |
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{ |
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struct device *dev = rtc; |
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); |
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struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev); |
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unsigned long events = 0; |
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int ret; |
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u32 rtc_reg; |
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ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL2, &rtc_reg); |
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if (ret < 0) |
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return IRQ_NONE; |
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if (rtc_reg & GET_YAL_STATUS) { |
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events = RTC_IRQF | RTC_AF; |
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/* clear pending Y-alarm interrupt bit */ |
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rtc_reg &= ~GET_YAL_STATUS; |
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} |
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ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, rtc_reg); |
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if (ret) |
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return IRQ_NONE; |
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/* Notify RTC core on event */ |
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rtc_update_irq(rc5t583_rtc->rtc, 1, events); |
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return IRQ_HANDLED; |
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} |
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static const struct rtc_class_ops rc5t583_rtc_ops = { |
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.read_time = rc5t583_rtc_read_time, |
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.set_time = rc5t583_rtc_set_time, |
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.read_alarm = rc5t583_rtc_read_alarm, |
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.set_alarm = rc5t583_rtc_set_alarm, |
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.alarm_irq_enable = rc5t583_rtc_alarm_irq_enable, |
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}; |
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static int rc5t583_rtc_probe(struct platform_device *pdev) |
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{ |
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struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); |
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struct rc5t583_rtc *ricoh_rtc; |
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struct rc5t583_platform_data *pmic_plat_data; |
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int ret; |
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int irq; |
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ricoh_rtc = devm_kzalloc(&pdev->dev, sizeof(struct rc5t583_rtc), |
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GFP_KERNEL); |
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if (!ricoh_rtc) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, ricoh_rtc); |
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/* Clear pending interrupts */ |
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ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, 0); |
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if (ret < 0) |
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return ret; |
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/* clear RTC Adjust register */ |
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ret = regmap_write(rc5t583->regmap, RC5T583_RTC_ADJ, 0); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "unable to program rtc_adjust reg\n"); |
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return -EBUSY; |
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} |
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pmic_plat_data = dev_get_platdata(rc5t583->dev); |
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irq = pmic_plat_data->irq_base; |
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if (irq <= 0) { |
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dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n", |
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irq); |
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return ret; |
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} |
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irq += RC5T583_IRQ_YALE; |
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ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, |
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rc5t583_rtc_interrupt, IRQF_TRIGGER_LOW, |
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"rtc-rc5t583", &pdev->dev); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "IRQ is not free.\n"); |
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return ret; |
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} |
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device_init_wakeup(&pdev->dev, 1); |
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ricoh_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
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&rc5t583_rtc_ops, THIS_MODULE); |
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if (IS_ERR(ricoh_rtc->rtc)) { |
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ret = PTR_ERR(ricoh_rtc->rtc); |
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dev_err(&pdev->dev, "RTC device register: err %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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/* |
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* Disable rc5t583 RTC interrupts. |
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* Sets status flag to free. |
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*/ |
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static int rc5t583_rtc_remove(struct platform_device *pdev) |
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{ |
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struct rc5t583_rtc *rc5t583_rtc = platform_get_drvdata(pdev); |
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rc5t583_rtc_alarm_irq_enable(&rc5t583_rtc->rtc->dev, 0); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int rc5t583_rtc_suspend(struct device *dev) |
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{ |
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); |
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struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev); |
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int ret; |
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/* Store current list of enabled interrupts*/ |
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ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, |
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&rc5t583_rtc->irqen); |
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return ret; |
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} |
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static int rc5t583_rtc_resume(struct device *dev) |
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{ |
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); |
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struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev); |
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/* Restore list of enabled interrupts before suspend */ |
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return regmap_write(rc5t583->regmap, RC5T583_RTC_CTL1, |
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rc5t583_rtc->irqen); |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(rc5t583_rtc_pm_ops, rc5t583_rtc_suspend, |
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rc5t583_rtc_resume); |
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static struct platform_driver rc5t583_rtc_driver = { |
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.probe = rc5t583_rtc_probe, |
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.remove = rc5t583_rtc_remove, |
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.driver = { |
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.name = "rtc-rc5t583", |
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.pm = &rc5t583_rtc_pm_ops, |
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}, |
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}; |
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module_platform_driver(rc5t583_rtc_driver); |
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MODULE_ALIAS("platform:rtc-rc5t583"); |
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MODULE_AUTHOR("Venu Byravarasu <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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