443 lines
9.9 KiB
C
443 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* drivers/rtc/rtc-rc5t619.c
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*
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* Real time clock driver for RICOH RC5T619 power management chip.
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*
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* Copyright (C) 2019 Andreas Kemnade
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*/
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#include <linux/kernel.h>
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#include <linux/device.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/mfd/rn5t618.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/bcd.h>
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#include <linux/rtc.h>
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#include <linux/slab.h>
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#include <linux/irqdomain.h>
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struct rc5t619_rtc {
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int irq;
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struct rtc_device *rtc;
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struct rn5t618 *rn5t618;
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};
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#define CTRL1_ALARM_ENABLED 0x40
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#define CTRL1_24HR 0x20
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#define CTRL1_PERIODIC_MASK 0xf
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#define CTRL2_PON 0x10
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#define CTRL2_ALARM_STATUS 0x80
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#define CTRL2_CTFG 0x4
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#define CTRL2_CTC 0x1
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#define MONTH_CENTFLAG 0x80
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#define HOUR_PMFLAG 0x20
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#define MDAY_DAL_EXT 0x80
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static uint8_t rtc5t619_12hour_bcd2bin(uint8_t hour)
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{
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if (hour & HOUR_PMFLAG) {
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hour = bcd2bin(hour & ~HOUR_PMFLAG);
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return hour == 12 ? 12 : 12 + hour;
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}
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hour = bcd2bin(hour);
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return hour == 12 ? 0 : hour;
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}
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static uint8_t rtc5t619_12hour_bin2bcd(uint8_t hour)
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{
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if (!hour)
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return 0x12;
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if (hour < 12)
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return bin2bcd(hour);
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if (hour == 12)
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return 0x12 | HOUR_PMFLAG;
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return bin2bcd(hour - 12) | HOUR_PMFLAG;
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}
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static int rc5t619_rtc_periodic_disable(struct device *dev)
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{
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struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
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int err;
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/* disable function */
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err = regmap_update_bits(rtc->rn5t618->regmap,
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RN5T618_RTC_CTRL1, CTRL1_PERIODIC_MASK, 0);
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if (err < 0)
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return err;
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/* clear alarm flag and CTFG */
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err = regmap_update_bits(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2,
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CTRL2_ALARM_STATUS | CTRL2_CTFG | CTRL2_CTC,
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0);
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if (err < 0)
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return err;
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return 0;
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}
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/* things to be done once after power on */
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static int rc5t619_rtc_pon_setup(struct device *dev)
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{
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struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
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int err;
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unsigned int reg_data;
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err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, ®_data);
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if (err < 0)
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return err;
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/* clear VDET PON */
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reg_data &= ~(CTRL2_PON | CTRL2_CTC | 0x4a); /* 0101-1011 */
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reg_data |= 0x20; /* 0010-0000 */
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err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, reg_data);
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if (err < 0)
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return err;
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/* clearing RTC Adjust register */
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err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_ADJUST, 0);
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if (err)
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return err;
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return regmap_update_bits(rtc->rn5t618->regmap,
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RN5T618_RTC_CTRL1,
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CTRL1_24HR, CTRL1_24HR);
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}
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static int rc5t619_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
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u8 buff[7];
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int err;
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int cent_flag;
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unsigned int ctrl1;
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unsigned int ctrl2;
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err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
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if (err < 0)
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return err;
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if (ctrl2 & CTRL2_PON)
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return -EINVAL;
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err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
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if (err < 0)
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return err;
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err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
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buff, sizeof(buff));
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if (err < 0)
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return err;
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if (buff[5] & MONTH_CENTFLAG)
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cent_flag = 1;
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else
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cent_flag = 0;
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tm->tm_sec = bcd2bin(buff[0]);
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tm->tm_min = bcd2bin(buff[1]);
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if (ctrl1 & CTRL1_24HR)
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tm->tm_hour = bcd2bin(buff[2]);
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else
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tm->tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
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tm->tm_wday = bcd2bin(buff[3]);
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tm->tm_mday = bcd2bin(buff[4]);
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tm->tm_mon = bcd2bin(buff[5] & 0x1f) - 1; /* back to system 0-11 */
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tm->tm_year = bcd2bin(buff[6]) + 100 * cent_flag;
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return 0;
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}
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static int rc5t619_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
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u8 buff[7];
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int err;
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int cent_flag;
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unsigned int ctrl1;
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unsigned int ctrl2;
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err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
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if (err < 0)
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return err;
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if (ctrl2 & CTRL2_PON)
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rc5t619_rtc_pon_setup(dev);
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err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
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if (err < 0)
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return err;
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if (tm->tm_year >= 100)
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cent_flag = 1;
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else
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cent_flag = 0;
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buff[0] = bin2bcd(tm->tm_sec);
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buff[1] = bin2bcd(tm->tm_min);
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if (ctrl1 & CTRL1_24HR)
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buff[2] = bin2bcd(tm->tm_hour);
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else
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buff[2] = rtc5t619_12hour_bin2bcd(tm->tm_hour);
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buff[3] = bin2bcd(tm->tm_wday);
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buff[4] = bin2bcd(tm->tm_mday);
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buff[5] = bin2bcd(tm->tm_mon + 1); /* system set 0-11 */
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buff[6] = bin2bcd(tm->tm_year - cent_flag * 100);
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if (cent_flag)
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buff[5] |= MONTH_CENTFLAG;
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err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
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buff, sizeof(buff));
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if (err < 0) {
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dev_err(dev, "failed to program new time: %d\n", err);
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return err;
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}
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return 0;
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}
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/* 0-disable, 1-enable */
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static int rc5t619_rtc_alarm_enable(struct device *dev, unsigned int enabled)
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{
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struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
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return regmap_update_bits(rtc->rn5t618->regmap,
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RN5T618_RTC_CTRL1,
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CTRL1_ALARM_ENABLED,
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enabled ? CTRL1_ALARM_ENABLED : 0);
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}
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static int rc5t619_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
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u8 buff[6];
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unsigned int buff_cent;
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int err;
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int cent_flag;
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unsigned int ctrl1;
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err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
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if (err)
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return err;
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err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_MONTH, &buff_cent);
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if (err < 0) {
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dev_err(dev, "failed to read time: %d\n", err);
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return err;
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}
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if (buff_cent & MONTH_CENTFLAG)
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cent_flag = 1;
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else
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cent_flag = 0;
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err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
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buff, sizeof(buff));
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if (err)
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return err;
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buff[3] = buff[3] & 0x3f;
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alrm->time.tm_sec = bcd2bin(buff[0]);
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alrm->time.tm_min = bcd2bin(buff[1]);
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if (ctrl1 & CTRL1_24HR)
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alrm->time.tm_hour = bcd2bin(buff[2]);
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else
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alrm->time.tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
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alrm->time.tm_mday = bcd2bin(buff[3]);
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alrm->time.tm_mon = bcd2bin(buff[4]) - 1;
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alrm->time.tm_year = bcd2bin(buff[5]) + 100 * cent_flag;
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alrm->enabled = !!(ctrl1 & CTRL1_ALARM_ENABLED);
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dev_dbg(dev, "read alarm: %ptR\n", &alrm->time);
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return 0;
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}
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static int rc5t619_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
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u8 buff[6];
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int err;
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int cent_flag;
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unsigned int ctrl1;
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err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
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if (err)
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return err;
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err = rc5t619_rtc_alarm_enable(dev, 0);
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if (err < 0)
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return err;
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if (rtc->irq == -1)
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return -EINVAL;
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if (alrm->enabled == 0)
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return 0;
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if (alrm->time.tm_year >= 100)
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cent_flag = 1;
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else
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cent_flag = 0;
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alrm->time.tm_mon += 1;
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buff[0] = bin2bcd(alrm->time.tm_sec);
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buff[1] = bin2bcd(alrm->time.tm_min);
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if (ctrl1 & CTRL1_24HR)
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buff[2] = bin2bcd(alrm->time.tm_hour);
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else
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buff[2] = rtc5t619_12hour_bin2bcd(alrm->time.tm_hour);
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buff[3] = bin2bcd(alrm->time.tm_mday);
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buff[4] = bin2bcd(alrm->time.tm_mon);
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buff[5] = bin2bcd(alrm->time.tm_year - 100 * cent_flag);
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buff[3] |= MDAY_DAL_EXT;
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err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
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buff, sizeof(buff));
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if (err < 0)
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return err;
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return rc5t619_rtc_alarm_enable(dev, alrm->enabled);
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}
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static const struct rtc_class_ops rc5t619_rtc_ops = {
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.read_time = rc5t619_rtc_read_time,
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.set_time = rc5t619_rtc_set_time,
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.set_alarm = rc5t619_rtc_set_alarm,
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.read_alarm = rc5t619_rtc_read_alarm,
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.alarm_irq_enable = rc5t619_rtc_alarm_enable,
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};
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static int rc5t619_rtc_alarm_flag_clr(struct device *dev)
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{
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struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
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/* clear alarm-D status bits.*/
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return regmap_update_bits(rtc->rn5t618->regmap,
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RN5T618_RTC_CTRL2,
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CTRL2_ALARM_STATUS | CTRL2_CTC, 0);
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}
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static irqreturn_t rc5t619_rtc_irq(int irq, void *data)
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{
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struct device *dev = data;
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struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
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rc5t619_rtc_alarm_flag_clr(dev);
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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 rc5t619_rtc_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
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struct rc5t619_rtc *rtc;
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unsigned int ctrl2;
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int err;
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rtc = devm_kzalloc(dev, sizeof(*rtc), GFP_KERNEL);
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if (!rtc)
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return -ENOMEM;
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rtc->rn5t618 = rn5t618;
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dev_set_drvdata(dev, rtc);
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rtc->irq = -1;
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if (rn5t618->irq_data)
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rtc->irq = regmap_irq_get_virq(rn5t618->irq_data,
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RN5T618_IRQ_RTC);
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if (rtc->irq < 0)
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rtc->irq = -1;
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err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
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if (err < 0)
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return err;
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/* disable rtc periodic function */
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err = rc5t619_rtc_periodic_disable(&pdev->dev);
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if (err)
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return err;
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if (ctrl2 & CTRL2_PON) {
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err = rc5t619_rtc_alarm_flag_clr(&pdev->dev);
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if (err)
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return err;
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}
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rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(rtc->rtc)) {
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err = PTR_ERR(rtc->rtc);
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dev_err(dev, "RTC device register: err %d\n", err);
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return err;
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}
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rtc->rtc->ops = &rc5t619_rtc_ops;
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rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_1900;
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rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;
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/* set interrupt and enable it */
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if (rtc->irq != -1) {
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err = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
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rc5t619_rtc_irq,
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IRQF_ONESHOT,
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"rtc-rc5t619",
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&pdev->dev);
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if (err < 0) {
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dev_err(&pdev->dev, "request IRQ:%d fail\n", rtc->irq);
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rtc->irq = -1;
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err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
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if (err)
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return err;
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} else {
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/* enable wake */
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device_init_wakeup(&pdev->dev, 1);
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enable_irq_wake(rtc->irq);
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}
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} else {
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/* system don't want to using alarm interrupt, so close it */
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err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
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if (err)
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return err;
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dev_warn(&pdev->dev, "rc5t619 interrupt is disabled\n");
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}
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return rtc_register_device(rtc->rtc);
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}
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static struct platform_driver rc5t619_rtc_driver = {
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.driver = {
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.name = "rc5t619-rtc",
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},
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.probe = rc5t619_rtc_probe,
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};
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module_platform_driver(rc5t619_rtc_driver);
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MODULE_ALIAS("platform:rc5t619-rtc");
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MODULE_DESCRIPTION("RICOH RC5T619 RTC driver");
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MODULE_LICENSE("GPL");
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