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322 lines
8.0 KiB
322 lines
8.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* RTC driver for Maxim MAX8925 |
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* |
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* Copyright (C) 2009-2010 Marvell International Ltd. |
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* Haojian Zhuang <[email protected]> |
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*/ |
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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/rtc.h> |
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#include <linux/platform_device.h> |
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#include <linux/mfd/max8925.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 MAX8925_RTC_SEC 0x00 |
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#define MAX8925_RTC_MIN 0x01 |
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#define MAX8925_RTC_HOUR 0x02 |
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#define MAX8925_RTC_WEEKDAY 0x03 |
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#define MAX8925_RTC_DATE 0x04 |
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#define MAX8925_RTC_MONTH 0x05 |
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#define MAX8925_RTC_YEAR1 0x06 |
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#define MAX8925_RTC_YEAR2 0x07 |
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#define MAX8925_ALARM0_SEC 0x08 |
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#define MAX8925_ALARM0_MIN 0x09 |
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#define MAX8925_ALARM0_HOUR 0x0a |
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#define MAX8925_ALARM0_WEEKDAY 0x0b |
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#define MAX8925_ALARM0_DATE 0x0c |
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#define MAX8925_ALARM0_MON 0x0d |
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#define MAX8925_ALARM0_YEAR1 0x0e |
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#define MAX8925_ALARM0_YEAR2 0x0f |
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#define MAX8925_ALARM1_SEC 0x10 |
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#define MAX8925_ALARM1_MIN 0x11 |
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#define MAX8925_ALARM1_HOUR 0x12 |
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#define MAX8925_ALARM1_WEEKDAY 0x13 |
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#define MAX8925_ALARM1_DATE 0x14 |
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#define MAX8925_ALARM1_MON 0x15 |
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#define MAX8925_ALARM1_YEAR1 0x16 |
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#define MAX8925_ALARM1_YEAR2 0x17 |
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#define MAX8925_RTC_CNTL 0x1b |
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#define MAX8925_RTC_STATUS 0x20 |
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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 max8925_rtc_info { |
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struct rtc_device *rtc_dev; |
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struct max8925_chip *chip; |
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struct i2c_client *rtc; |
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struct device *dev; |
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int irq; |
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}; |
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static irqreturn_t rtc_update_handler(int irq, void *data) |
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{ |
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struct max8925_rtc_info *info = (struct max8925_rtc_info *)data; |
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/* disable ALARM0 except for 1SEC alarm */ |
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max8925_set_bits(info->rtc, MAX8925_ALARM0_CNTL, 0x7f, 0); |
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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 int tm_calc(struct rtc_time *tm, unsigned char *buf, int len) |
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{ |
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if (len < TIME_NUM) |
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return -EINVAL; |
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tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000 |
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+ (buf[RTC_YEAR2] & 0xf) * 100 |
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+ (buf[RTC_YEAR1] >> 4) * 10 |
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+ (buf[RTC_YEAR1] & 0xf); |
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tm->tm_year -= 1900; |
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tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10 |
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+ (buf[RTC_MONTH] & 0x0f); |
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tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10 |
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+ (buf[RTC_DATE] & 0x0f); |
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tm->tm_wday = buf[RTC_WEEKDAY] & 0x07; |
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if (buf[RTC_HOUR] & HOUR_12) { |
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tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10 |
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+ (buf[RTC_HOUR] & 0x0f); |
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if (buf[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 = ((buf[RTC_HOUR] >> 4) & 0x03) * 10 |
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+ (buf[RTC_HOUR] & 0x0f); |
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tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10 |
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+ (buf[RTC_MIN] & 0x0f); |
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tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10 |
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+ (buf[RTC_SEC] & 0x0f); |
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return 0; |
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} |
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static int data_calc(unsigned char *buf, struct rtc_time *tm, int len) |
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{ |
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unsigned char high, low; |
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if (len < TIME_NUM) |
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return -EINVAL; |
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high = (tm->tm_year + 1900) / 1000; |
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low = (tm->tm_year + 1900) / 100; |
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low = low - high * 10; |
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buf[RTC_YEAR2] = (high << 4) + low; |
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high = (tm->tm_year + 1900) / 10; |
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low = tm->tm_year + 1900; |
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low = low - high * 10; |
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high = high - (high / 10) * 10; |
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buf[RTC_YEAR1] = (high << 4) + low; |
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high = tm->tm_mon / 10; |
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low = tm->tm_mon; |
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low = low - high * 10; |
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buf[RTC_MONTH] = (high << 4) + low; |
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high = tm->tm_mday / 10; |
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low = tm->tm_mday; |
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low = low - high * 10; |
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buf[RTC_DATE] = (high << 4) + low; |
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buf[RTC_WEEKDAY] = tm->tm_wday; |
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high = tm->tm_hour / 10; |
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low = tm->tm_hour; |
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low = low - high * 10; |
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buf[RTC_HOUR] = (high << 4) + low; |
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high = tm->tm_min / 10; |
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low = tm->tm_min; |
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low = low - high * 10; |
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buf[RTC_MIN] = (high << 4) + low; |
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high = tm->tm_sec / 10; |
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low = tm->tm_sec; |
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low = low - high * 10; |
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buf[RTC_SEC] = (high << 4) + low; |
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return 0; |
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} |
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static int max8925_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct max8925_rtc_info *info = dev_get_drvdata(dev); |
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unsigned char buf[TIME_NUM]; |
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int ret; |
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ret = max8925_bulk_read(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf); |
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if (ret < 0) |
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goto out; |
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ret = tm_calc(tm, buf, TIME_NUM); |
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out: |
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return ret; |
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} |
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static int max8925_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct max8925_rtc_info *info = dev_get_drvdata(dev); |
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unsigned char buf[TIME_NUM]; |
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int ret; |
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ret = data_calc(buf, tm, TIME_NUM); |
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if (ret < 0) |
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goto out; |
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ret = max8925_bulk_write(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf); |
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out: |
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return ret; |
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} |
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static int max8925_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct max8925_rtc_info *info = dev_get_drvdata(dev); |
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unsigned char buf[TIME_NUM]; |
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int ret; |
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ret = max8925_bulk_read(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf); |
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if (ret < 0) |
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goto out; |
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ret = tm_calc(&alrm->time, buf, TIME_NUM); |
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if (ret < 0) |
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goto out; |
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ret = max8925_reg_read(info->rtc, MAX8925_RTC_IRQ_MASK); |
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if (ret < 0) |
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goto out; |
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if (ret & ALARM0_IRQ) { |
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alrm->enabled = 0; |
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} else { |
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ret = max8925_reg_read(info->rtc, MAX8925_ALARM0_CNTL); |
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if (ret < 0) |
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goto out; |
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if (!ret) |
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alrm->enabled = 0; |
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else |
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alrm->enabled = 1; |
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} |
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ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS); |
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if (ret < 0) |
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goto out; |
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if (ret & 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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out: |
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return ret; |
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} |
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static int max8925_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct max8925_rtc_info *info = dev_get_drvdata(dev); |
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unsigned char buf[TIME_NUM]; |
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int ret; |
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ret = data_calc(buf, &alrm->time, TIME_NUM); |
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if (ret < 0) |
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goto out; |
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ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf); |
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if (ret < 0) |
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goto out; |
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if (alrm->enabled) |
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/* only enable alarm on year/month/day/hour/min/sec */ |
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ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77); |
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else |
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ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x0); |
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out: |
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return ret; |
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} |
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static const struct rtc_class_ops max8925_rtc_ops = { |
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.read_time = max8925_rtc_read_time, |
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.set_time = max8925_rtc_set_time, |
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.read_alarm = max8925_rtc_read_alarm, |
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.set_alarm = max8925_rtc_set_alarm, |
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}; |
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static int max8925_rtc_probe(struct platform_device *pdev) |
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{ |
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struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); |
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struct max8925_rtc_info *info; |
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int ret; |
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info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_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->chip = chip; |
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info->rtc = chip->rtc; |
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info->dev = &pdev->dev; |
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info->irq = platform_get_irq(pdev, 0); |
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ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL, |
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rtc_update_handler, IRQF_ONESHOT, |
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"rtc-alarm0", info); |
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if (ret < 0) { |
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dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", |
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info->irq, ret); |
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return ret; |
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} |
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dev_set_drvdata(&pdev->dev, info); |
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/* XXX - isn't this redundant? */ |
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platform_set_drvdata(pdev, info); |
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device_init_wakeup(&pdev->dev, 1); |
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info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8925-rtc", |
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&max8925_rtc_ops, THIS_MODULE); |
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ret = PTR_ERR(info->rtc_dev); |
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if (IS_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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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int max8925_rtc_suspend(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); |
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if (device_may_wakeup(dev)) |
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chip->wakeup_flag |= 1 << MAX8925_IRQ_RTC_ALARM0; |
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return 0; |
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} |
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static int max8925_rtc_resume(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); |
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if (device_may_wakeup(dev)) |
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chip->wakeup_flag &= ~(1 << MAX8925_IRQ_RTC_ALARM0); |
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return 0; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(max8925_rtc_pm_ops, max8925_rtc_suspend, max8925_rtc_resume); |
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static struct platform_driver max8925_rtc_driver = { |
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.driver = { |
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.name = "max8925-rtc", |
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.pm = &max8925_rtc_pm_ops, |
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}, |
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.probe = max8925_rtc_probe, |
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}; |
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module_platform_driver(max8925_rtc_driver); |
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MODULE_DESCRIPTION("Maxim MAX8925 RTC driver"); |
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MODULE_AUTHOR("Haojian Zhuang <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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