drivers/rtc/rtc-ds3232.c: add alarm function
The DS3232 RTC driver only has the tick function. Add an alarm function so the driver is complete. Signed-off-by: Lan Chunhe-B25806 <b25806@freescale.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Wan ZongShun <mcuos.com@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Lan Chunhe-B25806
Linus Torvalds
parent
5b3ffddd8d
commit
f46418c5ca
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@ -171,7 +171,8 @@ config RTC_DRV_DS3232
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depends on RTC_CLASS && I2C
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help
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If you say yes here you get support for Dallas Semiconductor
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DS3232 real-time clock chips.
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DS3232 real-time clock chips. If an interrupt is associated
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with the device, the alarm functionality is supported.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds3232.
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@ -2,6 +2,7 @@
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* RTC client/driver for the Maxim/Dallas DS3232 Real-Time Clock over I2C
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*
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* Copyright (C) 2009-2010 Freescale Semiconductor.
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* Author: Jack Lan <jack.lan@freescale.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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@ -175,6 +176,182 @@ static int ds3232_set_time(struct device *dev, struct rtc_time *time)
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DS3232_REG_SECONDS, 7, buf);
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}
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/*
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* DS3232 has two alarm, we only use alarm1
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* According to linux specification, only support one-shot alarm
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* no periodic alarm mode
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*/
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static int ds3232_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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int control, stat;
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int ret;
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u8 buf[4];
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mutex_lock(&ds3232->mutex);
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ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
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if (ret < 0)
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goto out;
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stat = ret;
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ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
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if (ret < 0)
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goto out;
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control = ret;
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ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
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if (ret < 0)
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goto out;
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alarm->time.tm_sec = bcd2bin(buf[0] & 0x7F);
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alarm->time.tm_min = bcd2bin(buf[1] & 0x7F);
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alarm->time.tm_hour = bcd2bin(buf[2] & 0x7F);
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alarm->time.tm_mday = bcd2bin(buf[3] & 0x7F);
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alarm->time.tm_mon = -1;
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alarm->time.tm_year = -1;
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alarm->time.tm_wday = -1;
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alarm->time.tm_yday = -1;
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alarm->time.tm_isdst = -1;
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alarm->enabled = !!(control & DS3232_REG_CR_A1IE);
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alarm->pending = !!(stat & DS3232_REG_SR_A1F);
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ret = 0;
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out:
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mutex_unlock(&ds3232->mutex);
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return ret;
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}
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/*
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* linux rtc-module does not support wday alarm
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* and only 24h time mode supported indeed
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*/
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static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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int control, stat;
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int ret;
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u8 buf[4];
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if (client->irq <= 0)
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return -EINVAL;
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mutex_lock(&ds3232->mutex);
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buf[0] = bin2bcd(alarm->time.tm_sec);
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buf[1] = bin2bcd(alarm->time.tm_min);
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buf[2] = bin2bcd(alarm->time.tm_hour);
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buf[3] = bin2bcd(alarm->time.tm_mday);
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/* clear alarm interrupt enable bit */
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ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
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if (ret < 0)
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goto out;
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control = ret;
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control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
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ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
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if (ret < 0)
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goto out;
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/* clear any pending alarm flag */
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ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
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if (ret < 0)
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goto out;
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stat = ret;
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stat &= ~(DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
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ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
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if (ret < 0)
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goto out;
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ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
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if (alarm->enabled) {
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control |= DS3232_REG_CR_A1IE;
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ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
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}
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out:
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mutex_unlock(&ds3232->mutex);
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return ret;
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}
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static void ds3232_update_alarm(struct i2c_client *client)
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{
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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int control;
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int ret;
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u8 buf[4];
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mutex_lock(&ds3232->mutex);
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ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
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if (ret < 0)
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goto unlock;
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buf[0] = bcd2bin(buf[0]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
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0x80 : buf[0];
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buf[1] = bcd2bin(buf[1]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
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0x80 : buf[1];
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buf[2] = bcd2bin(buf[2]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
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0x80 : buf[2];
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buf[3] = bcd2bin(buf[3]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
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0x80 : buf[3];
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ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
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if (ret < 0)
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goto unlock;
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control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
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if (control < 0)
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goto unlock;
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if (ds3232->rtc->irq_data & (RTC_AF | RTC_UF))
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/* enable alarm1 interrupt */
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control |= DS3232_REG_CR_A1IE;
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else
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/* disable alarm1 interrupt */
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control &= ~(DS3232_REG_CR_A1IE);
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i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
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unlock:
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mutex_unlock(&ds3232->mutex);
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}
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static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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if (client->irq <= 0)
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return -EINVAL;
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if (enabled)
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ds3232->rtc->irq_data |= RTC_AF;
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else
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ds3232->rtc->irq_data &= ~RTC_AF;
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ds3232_update_alarm(client);
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return 0;
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}
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static int ds3232_update_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ds3232 *ds3232 = i2c_get_clientdata(client);
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if (client->irq <= 0)
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return -EINVAL;
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if (enabled)
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ds3232->rtc->irq_data |= RTC_UF;
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else
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ds3232->rtc->irq_data &= ~RTC_UF;
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ds3232_update_alarm(client);
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return 0;
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}
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static irqreturn_t ds3232_irq(int irq, void *dev_id)
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{
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struct i2c_client *client = dev_id;
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@ -222,6 +399,10 @@ unlock:
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static const struct rtc_class_ops ds3232_rtc_ops = {
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.read_time = ds3232_read_time,
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.set_time = ds3232_set_time,
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.read_alarm = ds3232_read_alarm,
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.set_alarm = ds3232_set_alarm,
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.alarm_irq_enable = ds3232_alarm_irq_enable,
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.update_irq_enable = ds3232_update_irq_enable,
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};
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static int __devinit ds3232_probe(struct i2c_client *client,
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