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321 lines
7.6 KiB
321 lines
7.6 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// RTC driver for Maxim MAX8998 |
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// |
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// Copyright (C) 2010 Samsung Electronics Co.Ltd |
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// Author: Minkyu Kang <[email protected]> |
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// Author: Joonyoung Shim <[email protected]> |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/slab.h> |
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#include <linux/bcd.h> |
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#include <linux/irqdomain.h> |
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#include <linux/rtc.h> |
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#include <linux/platform_device.h> |
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#include <linux/mfd/max8998.h> |
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#include <linux/mfd/max8998-private.h> |
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#include <linux/delay.h> |
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#define MAX8998_RTC_SEC 0x00 |
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#define MAX8998_RTC_MIN 0x01 |
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#define MAX8998_RTC_HOUR 0x02 |
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#define MAX8998_RTC_WEEKDAY 0x03 |
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#define MAX8998_RTC_DATE 0x04 |
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#define MAX8998_RTC_MONTH 0x05 |
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#define MAX8998_RTC_YEAR1 0x06 |
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#define MAX8998_RTC_YEAR2 0x07 |
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#define MAX8998_ALARM0_SEC 0x08 |
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#define MAX8998_ALARM0_MIN 0x09 |
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#define MAX8998_ALARM0_HOUR 0x0a |
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#define MAX8998_ALARM0_WEEKDAY 0x0b |
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#define MAX8998_ALARM0_DATE 0x0c |
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#define MAX8998_ALARM0_MONTH 0x0d |
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#define MAX8998_ALARM0_YEAR1 0x0e |
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#define MAX8998_ALARM0_YEAR2 0x0f |
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#define MAX8998_ALARM1_SEC 0x10 |
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#define MAX8998_ALARM1_MIN 0x11 |
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#define MAX8998_ALARM1_HOUR 0x12 |
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#define MAX8998_ALARM1_WEEKDAY 0x13 |
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#define MAX8998_ALARM1_DATE 0x14 |
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#define MAX8998_ALARM1_MONTH 0x15 |
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#define MAX8998_ALARM1_YEAR1 0x16 |
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#define MAX8998_ALARM1_YEAR2 0x17 |
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#define MAX8998_ALARM0_CONF 0x18 |
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#define MAX8998_ALARM1_CONF 0x19 |
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#define MAX8998_RTC_STATUS 0x1a |
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#define MAX8998_WTSR_SMPL_CNTL 0x1b |
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#define MAX8998_TEST 0x1f |
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#define HOUR_12 (1 << 7) |
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#define HOUR_PM (1 << 5) |
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#define ALARM0_STATUS (1 << 1) |
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#define ALARM1_STATUS (1 << 2) |
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enum { |
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RTC_SEC = 0, |
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RTC_MIN, |
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RTC_HOUR, |
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RTC_WEEKDAY, |
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RTC_DATE, |
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RTC_MONTH, |
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RTC_YEAR1, |
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RTC_YEAR2, |
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}; |
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struct max8998_rtc_info { |
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struct device *dev; |
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struct max8998_dev *max8998; |
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struct i2c_client *rtc; |
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struct rtc_device *rtc_dev; |
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int irq; |
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bool lp3974_bug_workaround; |
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}; |
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static void max8998_data_to_tm(u8 *data, struct rtc_time *tm) |
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{ |
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tm->tm_sec = bcd2bin(data[RTC_SEC]); |
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tm->tm_min = bcd2bin(data[RTC_MIN]); |
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if (data[RTC_HOUR] & HOUR_12) { |
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tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f); |
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if (data[RTC_HOUR] & HOUR_PM) |
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tm->tm_hour += 12; |
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} else |
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tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f); |
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tm->tm_wday = data[RTC_WEEKDAY] & 0x07; |
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tm->tm_mday = bcd2bin(data[RTC_DATE]); |
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tm->tm_mon = bcd2bin(data[RTC_MONTH]); |
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tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100; |
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tm->tm_year -= 1900; |
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} |
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static void max8998_tm_to_data(struct rtc_time *tm, u8 *data) |
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{ |
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data[RTC_SEC] = bin2bcd(tm->tm_sec); |
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data[RTC_MIN] = bin2bcd(tm->tm_min); |
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data[RTC_HOUR] = bin2bcd(tm->tm_hour); |
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data[RTC_WEEKDAY] = tm->tm_wday; |
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data[RTC_DATE] = bin2bcd(tm->tm_mday); |
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data[RTC_MONTH] = bin2bcd(tm->tm_mon); |
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data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100); |
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data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100); |
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} |
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static int max8998_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct max8998_rtc_info *info = dev_get_drvdata(dev); |
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u8 data[8]; |
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int ret; |
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ret = max8998_bulk_read(info->rtc, MAX8998_RTC_SEC, 8, data); |
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if (ret < 0) |
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return ret; |
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max8998_data_to_tm(data, tm); |
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return 0; |
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} |
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static int max8998_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct max8998_rtc_info *info = dev_get_drvdata(dev); |
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u8 data[8]; |
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int ret; |
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max8998_tm_to_data(tm, data); |
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ret = max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data); |
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if (info->lp3974_bug_workaround) |
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msleep(2000); |
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return ret; |
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} |
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static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct max8998_rtc_info *info = dev_get_drvdata(dev); |
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u8 data[8]; |
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u8 val; |
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int ret; |
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ret = max8998_bulk_read(info->rtc, MAX8998_ALARM0_SEC, 8, data); |
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if (ret < 0) |
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return ret; |
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max8998_data_to_tm(data, &alrm->time); |
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ret = max8998_read_reg(info->rtc, MAX8998_ALARM0_CONF, &val); |
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if (ret < 0) |
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return ret; |
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alrm->enabled = !!val; |
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ret = max8998_read_reg(info->rtc, MAX8998_RTC_STATUS, &val); |
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if (ret < 0) |
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return ret; |
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if (val & ALARM0_STATUS) |
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alrm->pending = 1; |
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else |
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alrm->pending = 0; |
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return 0; |
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} |
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static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info) |
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{ |
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int ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0); |
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if (info->lp3974_bug_workaround) |
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msleep(2000); |
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return ret; |
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} |
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static int max8998_rtc_start_alarm(struct max8998_rtc_info *info) |
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{ |
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int ret; |
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u8 alarm0_conf = 0x77; |
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/* LP3974 with delay bug chips has rtc alarm bugs with "MONTH" field */ |
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if (info->lp3974_bug_workaround) |
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alarm0_conf = 0x57; |
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ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, alarm0_conf); |
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if (info->lp3974_bug_workaround) |
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msleep(2000); |
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return ret; |
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} |
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static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct max8998_rtc_info *info = dev_get_drvdata(dev); |
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u8 data[8]; |
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int ret; |
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max8998_tm_to_data(&alrm->time, data); |
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ret = max8998_rtc_stop_alarm(info); |
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if (ret < 0) |
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return ret; |
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ret = max8998_bulk_write(info->rtc, MAX8998_ALARM0_SEC, 8, data); |
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if (ret < 0) |
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return ret; |
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if (info->lp3974_bug_workaround) |
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msleep(2000); |
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if (alrm->enabled) |
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ret = max8998_rtc_start_alarm(info); |
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return ret; |
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} |
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static int max8998_rtc_alarm_irq_enable(struct device *dev, |
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unsigned int enabled) |
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{ |
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struct max8998_rtc_info *info = dev_get_drvdata(dev); |
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if (enabled) |
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return max8998_rtc_start_alarm(info); |
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else |
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return max8998_rtc_stop_alarm(info); |
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} |
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static irqreturn_t max8998_rtc_alarm_irq(int irq, void *data) |
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{ |
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struct max8998_rtc_info *info = data; |
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rtc_update_irq(info->rtc_dev, 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 max8998_rtc_ops = { |
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.read_time = max8998_rtc_read_time, |
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.set_time = max8998_rtc_set_time, |
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.read_alarm = max8998_rtc_read_alarm, |
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.set_alarm = max8998_rtc_set_alarm, |
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.alarm_irq_enable = max8998_rtc_alarm_irq_enable, |
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}; |
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static int max8998_rtc_probe(struct platform_device *pdev) |
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{ |
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struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent); |
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struct max8998_platform_data *pdata = max8998->pdata; |
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struct max8998_rtc_info *info; |
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int ret; |
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info = devm_kzalloc(&pdev->dev, sizeof(struct max8998_rtc_info), |
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GFP_KERNEL); |
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if (!info) |
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return -ENOMEM; |
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info->dev = &pdev->dev; |
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info->max8998 = max8998; |
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info->rtc = max8998->rtc; |
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platform_set_drvdata(pdev, info); |
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info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8998-rtc", |
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&max8998_rtc_ops, THIS_MODULE); |
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if (IS_ERR(info->rtc_dev)) { |
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ret = PTR_ERR(info->rtc_dev); |
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dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); |
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return ret; |
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} |
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if (!max8998->irq_domain) |
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goto no_irq; |
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info->irq = irq_create_mapping(max8998->irq_domain, MAX8998_IRQ_ALARM0); |
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if (!info->irq) { |
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dev_warn(&pdev->dev, "Failed to map alarm IRQ\n"); |
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goto no_irq; |
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} |
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ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL, |
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max8998_rtc_alarm_irq, 0, "rtc-alarm0", info); |
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if (ret < 0) |
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dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", |
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info->irq, ret); |
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no_irq: |
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dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name); |
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if (pdata && pdata->rtc_delay) { |
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info->lp3974_bug_workaround = true; |
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dev_warn(&pdev->dev, "LP3974 with RTC REGERR option." |
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" RTC updates will be extremely slow.\n"); |
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} |
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return 0; |
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} |
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static const struct platform_device_id max8998_rtc_id[] = { |
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{ "max8998-rtc", TYPE_MAX8998 }, |
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{ "lp3974-rtc", TYPE_LP3974 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(platform, max8998_rtc_id); |
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static struct platform_driver max8998_rtc_driver = { |
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.driver = { |
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.name = "max8998-rtc", |
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}, |
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.probe = max8998_rtc_probe, |
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.id_table = max8998_rtc_id, |
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}; |
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module_platform_driver(max8998_rtc_driver); |
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MODULE_AUTHOR("Minkyu Kang <[email protected]>"); |
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MODULE_AUTHOR("Joonyoung Shim <[email protected]>"); |
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MODULE_DESCRIPTION("Maxim MAX8998 RTC driver"); |
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MODULE_LICENSE("GPL");
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