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324 lines
8.2 KiB
324 lines
8.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* rtc-tps80031.c -- TI TPS80031/TPS80032 RTC driver |
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* |
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* RTC driver for TI TPS80031/TPS80032 Fully Integrated |
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* Power Management with Power Path and Battery Charger |
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* |
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* Copyright (c) 2012, NVIDIA Corporation. |
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* |
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* Author: Laxman Dewangan <[email protected]> |
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*/ |
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#include <linux/bcd.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/mfd/tps80031.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm.h> |
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#include <linux/rtc.h> |
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#include <linux/slab.h> |
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#define ENABLE_ALARM_INT 0x08 |
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#define ALARM_INT_STATUS 0x40 |
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/** |
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* Setting bit to 1 in STOP_RTC will run the RTC and |
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* setting this bit to 0 will freeze RTC. |
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*/ |
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#define STOP_RTC 0x1 |
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/* Power on reset Values of RTC registers */ |
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#define TPS80031_RTC_POR_YEAR 0 |
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#define TPS80031_RTC_POR_MONTH 1 |
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#define TPS80031_RTC_POR_DAY 1 |
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/* Numbers of registers for time and alarms */ |
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#define TPS80031_RTC_TIME_NUM_REGS 7 |
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#define TPS80031_RTC_ALARM_NUM_REGS 6 |
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/** |
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* PMU RTC have only 2 nibbles to store year information, so using an |
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* offset of 100 to set the base year as 2000 for our driver. |
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*/ |
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#define RTC_YEAR_OFFSET 100 |
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struct tps80031_rtc { |
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struct rtc_device *rtc; |
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int irq; |
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}; |
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static int tps80031_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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u8 buff[TPS80031_RTC_TIME_NUM_REGS]; |
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int ret; |
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ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_SECONDS_REG, TPS80031_RTC_TIME_NUM_REGS, buff); |
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if (ret < 0) { |
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dev_err(dev, "reading RTC_SECONDS_REG failed, err = %d\n", ret); |
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return ret; |
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} |
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tm->tm_sec = bcd2bin(buff[0]); |
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tm->tm_min = bcd2bin(buff[1]); |
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tm->tm_hour = bcd2bin(buff[2]); |
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tm->tm_mday = bcd2bin(buff[3]); |
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tm->tm_mon = bcd2bin(buff[4]) - 1; |
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tm->tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET; |
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tm->tm_wday = bcd2bin(buff[6]); |
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return 0; |
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} |
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static int tps80031_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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u8 buff[7]; |
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int ret; |
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buff[0] = bin2bcd(tm->tm_sec); |
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buff[1] = bin2bcd(tm->tm_min); |
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buff[2] = bin2bcd(tm->tm_hour); |
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buff[3] = bin2bcd(tm->tm_mday); |
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buff[4] = bin2bcd(tm->tm_mon + 1); |
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buff[5] = bin2bcd(tm->tm_year % RTC_YEAR_OFFSET); |
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buff[6] = bin2bcd(tm->tm_wday); |
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/* Stop RTC while updating the RTC time registers */ |
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ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_RTC_CTRL_REG, STOP_RTC); |
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if (ret < 0) { |
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dev_err(dev->parent, "Stop RTC failed, err = %d\n", ret); |
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return ret; |
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} |
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ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_SECONDS_REG, |
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TPS80031_RTC_TIME_NUM_REGS, buff); |
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if (ret < 0) { |
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dev_err(dev, "writing RTC_SECONDS_REG failed, err %d\n", ret); |
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return ret; |
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} |
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ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_RTC_CTRL_REG, STOP_RTC); |
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if (ret < 0) |
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dev_err(dev->parent, "Start RTC failed, err = %d\n", ret); |
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return ret; |
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} |
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static int tps80031_rtc_alarm_irq_enable(struct device *dev, |
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unsigned int enable) |
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{ |
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int ret; |
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if (enable) |
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ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT); |
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else |
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ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT); |
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if (ret < 0) { |
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dev_err(dev, "Update on RTC_INT failed, 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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static int tps80031_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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u8 buff[TPS80031_RTC_ALARM_NUM_REGS]; |
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int ret; |
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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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buff[2] = 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 + 1); |
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buff[5] = bin2bcd(alrm->time.tm_year % RTC_YEAR_OFFSET); |
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ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_ALARM_SECONDS_REG, |
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TPS80031_RTC_ALARM_NUM_REGS, buff); |
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if (ret < 0) { |
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dev_err(dev, "Writing RTC_ALARM failed, err %d\n", ret); |
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return ret; |
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} |
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return tps80031_rtc_alarm_irq_enable(dev, alrm->enabled); |
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} |
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static int tps80031_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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u8 buff[6]; |
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int ret; |
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ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_ALARM_SECONDS_REG, |
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TPS80031_RTC_ALARM_NUM_REGS, buff); |
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if (ret < 0) { |
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dev_err(dev->parent, |
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"reading RTC_ALARM failed, err = %d\n", ret); |
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return ret; |
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} |
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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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alrm->time.tm_hour = 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]) + RTC_YEAR_OFFSET; |
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return 0; |
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} |
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static int clear_alarm_int_status(struct device *dev, struct tps80031_rtc *rtc) |
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{ |
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int ret; |
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u8 buf; |
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/** |
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* As per datasheet, A dummy read of this RTC_STATUS_REG register |
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* is necessary before each I2C read in order to update the status |
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* register value. |
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*/ |
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ret = tps80031_read(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_RTC_STATUS_REG, &buf); |
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if (ret < 0) { |
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dev_err(dev, "reading RTC_STATUS failed. err = %d\n", ret); |
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return ret; |
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} |
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/* clear Alarm status bits.*/ |
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ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1, |
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TPS80031_RTC_STATUS_REG, ALARM_INT_STATUS); |
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if (ret < 0) { |
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dev_err(dev, "clear Alarm INT failed, 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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static irqreturn_t tps80031_rtc_irq(int irq, void *data) |
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{ |
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struct device *dev = data; |
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struct tps80031_rtc *rtc = dev_get_drvdata(dev); |
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int ret; |
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ret = clear_alarm_int_status(dev, rtc); |
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if (ret < 0) |
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return ret; |
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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 const struct rtc_class_ops tps80031_rtc_ops = { |
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.read_time = tps80031_rtc_read_time, |
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.set_time = tps80031_rtc_set_time, |
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.set_alarm = tps80031_rtc_set_alarm, |
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.read_alarm = tps80031_rtc_read_alarm, |
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.alarm_irq_enable = tps80031_rtc_alarm_irq_enable, |
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}; |
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static int tps80031_rtc_probe(struct platform_device *pdev) |
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{ |
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struct tps80031_rtc *rtc; |
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struct rtc_time tm; |
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int ret; |
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rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); |
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if (!rtc) |
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return -ENOMEM; |
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rtc->irq = platform_get_irq(pdev, 0); |
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platform_set_drvdata(pdev, rtc); |
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/* Start RTC */ |
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ret = tps80031_set_bits(pdev->dev.parent, TPS80031_SLAVE_ID1, |
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TPS80031_RTC_CTRL_REG, STOP_RTC); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "failed to start RTC. err = %d\n", ret); |
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return ret; |
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} |
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/* If RTC have POR values, set time 01:01:2000 */ |
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tps80031_rtc_read_time(&pdev->dev, &tm); |
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if ((tm.tm_year == RTC_YEAR_OFFSET + TPS80031_RTC_POR_YEAR) && |
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(tm.tm_mon == (TPS80031_RTC_POR_MONTH - 1)) && |
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(tm.tm_mday == TPS80031_RTC_POR_DAY)) { |
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tm.tm_year = 2000; |
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tm.tm_mday = 1; |
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tm.tm_mon = 1; |
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ret = tps80031_rtc_set_time(&pdev->dev, &tm); |
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if (ret < 0) { |
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dev_err(&pdev->dev, |
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"RTC set time failed, err = %d\n", ret); |
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return ret; |
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} |
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} |
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/* Clear alarm intretupt status if it is there */ |
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ret = clear_alarm_int_status(&pdev->dev, rtc); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "Clear alarm int failed, err = %d\n", ret); |
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return ret; |
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} |
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rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
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&tps80031_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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dev_err(&pdev->dev, "RTC registration failed, err %d\n", ret); |
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return ret; |
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} |
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ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, |
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tps80031_rtc_irq, |
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IRQF_ONESHOT, |
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dev_name(&pdev->dev), rtc); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "request IRQ:%d failed, err = %d\n", |
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rtc->irq, ret); |
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return ret; |
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} |
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device_set_wakeup_capable(&pdev->dev, 1); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int tps80031_rtc_suspend(struct device *dev) |
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{ |
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struct tps80031_rtc *rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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enable_irq_wake(rtc->irq); |
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return 0; |
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} |
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static int tps80031_rtc_resume(struct device *dev) |
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{ |
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struct tps80031_rtc *rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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disable_irq_wake(rtc->irq); |
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return 0; |
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}; |
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#endif |
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static SIMPLE_DEV_PM_OPS(tps80031_pm_ops, tps80031_rtc_suspend, |
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tps80031_rtc_resume); |
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static struct platform_driver tps80031_rtc_driver = { |
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.driver = { |
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.name = "tps80031-rtc", |
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.pm = &tps80031_pm_ops, |
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}, |
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.probe = tps80031_rtc_probe, |
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}; |
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module_platform_driver(tps80031_rtc_driver); |
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MODULE_ALIAS("platform:tps80031-rtc"); |
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MODULE_DESCRIPTION("TI TPS80031/TPS80032 RTC driver"); |
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MODULE_AUTHOR("Laxman Dewangan <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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