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472 lines
12 KiB
472 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* rtc-tps65910.c -- TPS65910 Real Time Clock interface |
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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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* Based on original TI driver rtc-twl.c |
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* Copyright (C) 2007 MontaVista Software, Inc |
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* Author: Alexandre Rusev <[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/math64.h> |
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#include <linux/property.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/tps65910.h> |
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struct tps65910_rtc { |
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struct rtc_device *rtc; |
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int irq; |
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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 (TPS65910_YEARS - TPS65910_SECONDS + 1) |
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/* Total number of RTC registers needed to set compensation registers */ |
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#define NUM_COMP_REGS (TPS65910_RTC_COMP_MSB - TPS65910_RTC_COMP_LSB + 1) |
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/* Min and max values supported with 'offset' interface (swapped sign) */ |
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#define MIN_OFFSET (-277761) |
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#define MAX_OFFSET (277778) |
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/* Number of ticks per hour */ |
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#define TICKS_PER_HOUR (32768 * 3600) |
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/* Multiplier for ppb conversions */ |
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#define PPB_MULT (1000000000LL) |
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static int tps65910_rtc_alarm_irq_enable(struct device *dev, |
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unsigned int enabled) |
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{ |
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struct tps65910 *tps = dev_get_drvdata(dev->parent); |
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u8 val = 0; |
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if (enabled) |
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val = TPS65910_RTC_INTERRUPTS_IT_ALARM; |
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return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val); |
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} |
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/* |
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* Gets current tps65910 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 tps65910_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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unsigned char rtc_data[NUM_TIME_REGS]; |
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struct tps65910 *tps = dev_get_drvdata(dev->parent); |
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int ret; |
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/* Copy RTC counting registers to static registers or latches */ |
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ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, |
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TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME); |
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if (ret < 0) { |
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dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret); |
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return ret; |
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} |
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ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data, |
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NUM_TIME_REGS); |
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if (ret < 0) { |
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dev_err(dev, "reading from RTC 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_mday = bcd2bin(rtc_data[3]); |
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tm->tm_mon = bcd2bin(rtc_data[4]) - 1; |
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tm->tm_year = bcd2bin(rtc_data[5]) + 100; |
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return ret; |
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} |
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static int tps65910_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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unsigned char rtc_data[NUM_TIME_REGS]; |
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struct tps65910 *tps = dev_get_drvdata(dev->parent); |
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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_mday); |
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rtc_data[4] = bin2bcd(tm->tm_mon + 1); |
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rtc_data[5] = bin2bcd(tm->tm_year - 100); |
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/* Stop RTC while updating the RTC time registers */ |
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ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, |
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TPS65910_RTC_CTRL_STOP_RTC, 0); |
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if (ret < 0) { |
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dev_err(dev, "RTC stop failed with err:%d\n", ret); |
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return ret; |
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} |
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/* update all the time registers in one shot */ |
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ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, 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 error %d\n", ret); |
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return ret; |
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} |
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/* Start back RTC */ |
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ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, |
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TPS65910_RTC_CTRL_STOP_RTC, 1); |
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if (ret < 0) |
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dev_err(dev, "RTC start failed with err:%d\n", ret); |
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return ret; |
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} |
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/* |
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* Gets current tps65910 RTC alarm time. |
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*/ |
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static int tps65910_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
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{ |
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unsigned char alarm_data[NUM_TIME_REGS]; |
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u32 int_val; |
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struct tps65910 *tps = dev_get_drvdata(dev->parent); |
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int ret; |
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ret = regmap_bulk_read(tps->regmap, TPS65910_ALARM_SECONDS, alarm_data, |
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NUM_TIME_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 = bcd2bin(alarm_data[0]); |
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alm->time.tm_min = bcd2bin(alarm_data[1]); |
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alm->time.tm_hour = bcd2bin(alarm_data[2]); |
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alm->time.tm_mday = bcd2bin(alarm_data[3]); |
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alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1; |
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alm->time.tm_year = bcd2bin(alarm_data[5]) + 100; |
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ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val); |
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if (ret < 0) |
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return ret; |
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if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM) |
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alm->enabled = 1; |
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return ret; |
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} |
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static int tps65910_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) |
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{ |
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unsigned char alarm_data[NUM_TIME_REGS]; |
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struct tps65910 *tps = dev_get_drvdata(dev->parent); |
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int ret; |
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ret = tps65910_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_sec); |
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alarm_data[1] = bin2bcd(alm->time.tm_min); |
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alarm_data[2] = bin2bcd(alm->time.tm_hour); |
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alarm_data[3] = bin2bcd(alm->time.tm_mday); |
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alarm_data[4] = bin2bcd(alm->time.tm_mon + 1); |
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alarm_data[5] = bin2bcd(alm->time.tm_year - 100); |
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/* update all the alarm registers in one shot */ |
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ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS, |
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alarm_data, NUM_TIME_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 = tps65910_rtc_alarm_irq_enable(dev, 1); |
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return ret; |
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} |
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static int tps65910_rtc_set_calibration(struct device *dev, int calibration) |
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{ |
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unsigned char comp_data[NUM_COMP_REGS]; |
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struct tps65910 *tps = dev_get_drvdata(dev->parent); |
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s16 value; |
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int ret; |
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/* |
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* TPS65910 uses two's complement 16 bit value for compensation for RTC |
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* crystal inaccuracies. One time every hour when seconds counter |
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* increments from 0 to 1 compensation value will be added to internal |
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* RTC counter value. |
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* |
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* Compensation value 0x7FFF is prohibited value. |
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* |
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* Valid range for compensation value: [-32768 .. 32766] |
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*/ |
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if ((calibration < -32768) || (calibration > 32766)) { |
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dev_err(dev, "RTC calibration value out of range: %d\n", |
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calibration); |
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return -EINVAL; |
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} |
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value = (s16)calibration; |
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comp_data[0] = (u16)value & 0xFF; |
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comp_data[1] = ((u16)value >> 8) & 0xFF; |
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/* Update all the compensation registers in one shot */ |
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ret = regmap_bulk_write(tps->regmap, TPS65910_RTC_COMP_LSB, |
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comp_data, NUM_COMP_REGS); |
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if (ret < 0) { |
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dev_err(dev, "rtc_set_calibration error: %d\n", ret); |
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return ret; |
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} |
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/* Enable automatic compensation */ |
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ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, |
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TPS65910_RTC_CTRL_AUTO_COMP, TPS65910_RTC_CTRL_AUTO_COMP); |
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if (ret < 0) |
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dev_err(dev, "auto_comp enable failed with error: %d\n", ret); |
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return ret; |
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} |
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static int tps65910_rtc_get_calibration(struct device *dev, int *calibration) |
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{ |
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unsigned char comp_data[NUM_COMP_REGS]; |
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struct tps65910 *tps = dev_get_drvdata(dev->parent); |
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unsigned int ctrl; |
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u16 value; |
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int ret; |
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ret = regmap_read(tps->regmap, TPS65910_RTC_CTRL, &ctrl); |
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if (ret < 0) |
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return ret; |
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/* If automatic compensation is not enabled report back zero */ |
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if (!(ctrl & TPS65910_RTC_CTRL_AUTO_COMP)) { |
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*calibration = 0; |
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return 0; |
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} |
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ret = regmap_bulk_read(tps->regmap, TPS65910_RTC_COMP_LSB, comp_data, |
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NUM_COMP_REGS); |
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if (ret < 0) { |
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dev_err(dev, "rtc_get_calibration error: %d\n", ret); |
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return ret; |
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} |
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value = (u16)comp_data[0] | ((u16)comp_data[1] << 8); |
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*calibration = (s16)value; |
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return 0; |
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} |
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static int tps65910_read_offset(struct device *dev, long *offset) |
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{ |
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int calibration; |
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s64 tmp; |
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int ret; |
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ret = tps65910_rtc_get_calibration(dev, &calibration); |
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if (ret < 0) |
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return ret; |
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/* Convert from RTC calibration register format to ppb format */ |
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tmp = calibration * (s64)PPB_MULT; |
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if (tmp < 0) |
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tmp -= TICKS_PER_HOUR / 2LL; |
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else |
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tmp += TICKS_PER_HOUR / 2LL; |
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tmp = div_s64(tmp, TICKS_PER_HOUR); |
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/* Offset value operates in negative way, so swap sign */ |
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*offset = (long)-tmp; |
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return 0; |
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} |
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static int tps65910_set_offset(struct device *dev, long offset) |
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{ |
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int calibration; |
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s64 tmp; |
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int ret; |
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/* Make sure offset value is within supported range */ |
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if (offset < MIN_OFFSET || offset > MAX_OFFSET) |
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return -ERANGE; |
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/* Convert from ppb format to RTC calibration register format */ |
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tmp = offset * (s64)TICKS_PER_HOUR; |
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if (tmp < 0) |
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tmp -= PPB_MULT / 2LL; |
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else |
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tmp += PPB_MULT / 2LL; |
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tmp = div_s64(tmp, PPB_MULT); |
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/* Offset value operates in negative way, so swap sign */ |
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calibration = (int)-tmp; |
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ret = tps65910_rtc_set_calibration(dev, calibration); |
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return ret; |
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} |
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static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc) |
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{ |
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struct device *dev = rtc; |
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unsigned long events = 0; |
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struct tps65910 *tps = dev_get_drvdata(dev->parent); |
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struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev); |
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int ret; |
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u32 rtc_reg; |
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ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg); |
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if (ret) |
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return IRQ_NONE; |
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if (rtc_reg & TPS65910_RTC_STATUS_ALARM) |
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events = RTC_IRQF | RTC_AF; |
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ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, 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(tps_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 tps65910_rtc_ops = { |
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.read_time = tps65910_rtc_read_time, |
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.set_time = tps65910_rtc_set_time, |
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.read_alarm = tps65910_rtc_read_alarm, |
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.set_alarm = tps65910_rtc_set_alarm, |
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.alarm_irq_enable = tps65910_rtc_alarm_irq_enable, |
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.read_offset = tps65910_read_offset, |
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.set_offset = tps65910_set_offset, |
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}; |
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static int tps65910_rtc_probe(struct platform_device *pdev) |
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{ |
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struct tps65910 *tps65910 = NULL; |
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struct tps65910_rtc *tps_rtc = NULL; |
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int ret; |
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int irq; |
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u32 rtc_reg; |
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tps65910 = dev_get_drvdata(pdev->dev.parent); |
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tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc), |
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GFP_KERNEL); |
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if (!tps_rtc) |
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return -ENOMEM; |
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tps_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); |
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if (IS_ERR(tps_rtc->rtc)) |
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return PTR_ERR(tps_rtc->rtc); |
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/* Clear pending interrupts */ |
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ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg); |
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if (ret < 0) |
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return ret; |
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ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg); |
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if (ret < 0) |
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return ret; |
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dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n"); |
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/* Enable RTC digital power domain */ |
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ret = regmap_update_bits(tps65910->regmap, TPS65910_DEVCTRL, |
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DEVCTRL_RTC_PWDN_MASK, 0 << DEVCTRL_RTC_PWDN_SHIFT); |
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if (ret < 0) |
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return ret; |
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rtc_reg = TPS65910_RTC_CTRL_STOP_RTC; |
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ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg); |
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if (ret < 0) |
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return ret; |
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platform_set_drvdata(pdev, tps_rtc); |
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irq = platform_get_irq(pdev, 0); |
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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 -ENXIO; |
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} |
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ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, |
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tps65910_rtc_interrupt, IRQF_TRIGGER_LOW, |
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dev_name(&pdev->dev), &pdev->dev); |
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if (ret < 0) |
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irq = -1; |
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tps_rtc->irq = irq; |
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if (irq != -1) { |
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if (device_property_present(tps65910->dev, "wakeup-source")) |
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device_init_wakeup(&pdev->dev, 1); |
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else |
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device_set_wakeup_capable(&pdev->dev, 1); |
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} else { |
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clear_bit(RTC_FEATURE_ALARM, tps_rtc->rtc->features); |
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} |
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tps_rtc->rtc->ops = &tps65910_rtc_ops; |
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tps_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
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tps_rtc->rtc->range_max = RTC_TIMESTAMP_END_2099; |
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return devm_rtc_register_device(tps_rtc->rtc); |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int tps65910_rtc_suspend(struct device *dev) |
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{ |
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struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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enable_irq_wake(tps_rtc->irq); |
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return 0; |
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} |
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static int tps65910_rtc_resume(struct device *dev) |
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{ |
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struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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disable_irq_wake(tps_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(tps65910_rtc_pm_ops, tps65910_rtc_suspend, |
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tps65910_rtc_resume); |
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static struct platform_driver tps65910_rtc_driver = { |
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.probe = tps65910_rtc_probe, |
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.driver = { |
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.name = "tps65910-rtc", |
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.pm = &tps65910_rtc_pm_ops, |
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}, |
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}; |
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module_platform_driver(tps65910_rtc_driver); |
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MODULE_ALIAS("platform:tps65910-rtc"); |
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MODULE_AUTHOR("Venu Byravarasu <[email protected]>"); |
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MODULE_LICENSE("GPL");
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