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221 lines
5.1 KiB
221 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* RTC driver for Maxim MAX8907 |
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* |
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* Copyright (c) 2011-2012, NVIDIA Corporation. |
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* |
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* Based on drivers/rtc/rtc-max8925.c, |
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* Copyright (C) 2009-2010 Marvell International Ltd. |
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*/ |
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#include <linux/bcd.h> |
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#include <linux/i2c.h> |
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#include <linux/mfd/max8907.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/rtc.h> |
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#include <linux/slab.h> |
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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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#define TIME_NUM 8 |
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#define ALARM_1SEC (1 << 7) |
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#define HOUR_12 (1 << 7) |
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#define HOUR_AM_PM (1 << 5) |
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#define ALARM0_IRQ (1 << 3) |
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#define ALARM1_IRQ (1 << 2) |
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#define ALARM0_STATUS (1 << 2) |
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#define ALARM1_STATUS (1 << 1) |
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struct max8907_rtc { |
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struct max8907 *max8907; |
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struct regmap *regmap; |
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struct rtc_device *rtc_dev; |
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int irq; |
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}; |
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static irqreturn_t max8907_irq_handler(int irq, void *data) |
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{ |
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struct max8907_rtc *rtc = data; |
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regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0); |
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rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); |
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return IRQ_HANDLED; |
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} |
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static void regs_to_tm(u8 *regs, struct rtc_time *tm) |
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{ |
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tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 + |
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bcd2bin(regs[RTC_YEAR1]) - 1900; |
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tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1; |
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tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f); |
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tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07); |
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if (regs[RTC_HOUR] & HOUR_12) { |
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tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f); |
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if (tm->tm_hour == 12) |
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tm->tm_hour = 0; |
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if (regs[RTC_HOUR] & HOUR_AM_PM) |
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tm->tm_hour += 12; |
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} else { |
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tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f); |
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} |
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tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f); |
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tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f); |
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} |
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static void tm_to_regs(struct rtc_time *tm, u8 *regs) |
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{ |
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u8 high, low; |
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high = (tm->tm_year + 1900) / 100; |
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low = tm->tm_year % 100; |
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regs[RTC_YEAR2] = bin2bcd(high); |
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regs[RTC_YEAR1] = bin2bcd(low); |
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regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1); |
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regs[RTC_DATE] = bin2bcd(tm->tm_mday); |
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regs[RTC_WEEKDAY] = tm->tm_wday; |
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regs[RTC_HOUR] = bin2bcd(tm->tm_hour); |
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regs[RTC_MIN] = bin2bcd(tm->tm_min); |
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regs[RTC_SEC] = bin2bcd(tm->tm_sec); |
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} |
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static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct max8907_rtc *rtc = dev_get_drvdata(dev); |
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u8 regs[TIME_NUM]; |
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int ret; |
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ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs, |
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TIME_NUM); |
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if (ret < 0) |
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return ret; |
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regs_to_tm(regs, tm); |
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return 0; |
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} |
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static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct max8907_rtc *rtc = dev_get_drvdata(dev); |
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u8 regs[TIME_NUM]; |
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tm_to_regs(tm, regs); |
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return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs, |
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TIME_NUM); |
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} |
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static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct max8907_rtc *rtc = dev_get_drvdata(dev); |
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u8 regs[TIME_NUM]; |
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unsigned int val; |
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int ret; |
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ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, |
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TIME_NUM); |
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if (ret < 0) |
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return ret; |
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regs_to_tm(regs, &alrm->time); |
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ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val); |
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if (ret < 0) |
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return ret; |
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alrm->enabled = !!(val & 0x7f); |
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return 0; |
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} |
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static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct max8907_rtc *rtc = dev_get_drvdata(dev); |
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u8 regs[TIME_NUM]; |
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int ret; |
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tm_to_regs(&alrm->time, regs); |
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/* Disable alarm while we update the target time */ |
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ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0); |
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if (ret < 0) |
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return ret; |
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ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, |
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TIME_NUM); |
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if (ret < 0) |
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return ret; |
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if (alrm->enabled) |
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ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x77); |
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return ret; |
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} |
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static const struct rtc_class_ops max8907_rtc_ops = { |
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.read_time = max8907_rtc_read_time, |
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.set_time = max8907_rtc_set_time, |
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.read_alarm = max8907_rtc_read_alarm, |
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.set_alarm = max8907_rtc_set_alarm, |
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}; |
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static int max8907_rtc_probe(struct platform_device *pdev) |
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{ |
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struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent); |
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struct max8907_rtc *rtc; |
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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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platform_set_drvdata(pdev, rtc); |
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rtc->max8907 = max8907; |
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rtc->regmap = max8907->regmap_rtc; |
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rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc", |
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&max8907_rtc_ops, THIS_MODULE); |
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if (IS_ERR(rtc->rtc_dev)) { |
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ret = PTR_ERR(rtc->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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rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc, |
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MAX8907_IRQ_RTC_ALARM0); |
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if (rtc->irq < 0) |
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return rtc->irq; |
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ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, |
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max8907_irq_handler, |
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IRQF_ONESHOT, "max8907-alarm0", rtc); |
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if (ret < 0) |
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dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n", |
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rtc->irq, ret); |
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return ret; |
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} |
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static struct platform_driver max8907_rtc_driver = { |
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.driver = { |
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.name = "max8907-rtc", |
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}, |
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.probe = max8907_rtc_probe, |
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}; |
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module_platform_driver(max8907_rtc_driver); |
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MODULE_DESCRIPTION("Maxim MAX8907 RTC driver"); |
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MODULE_LICENSE("GPL v2");
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