C++ rtc_valid_tm函数代码示例

/*
 * NOTE: M48T59 only uses BCD mode
 */
static int m48t59_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct m48t59_plat_data *pdata = pdev->dev.platform_data;
	struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
	unsigned long flags;
	u8 val;

	spin_lock_irqsave(&m48t59->lock, flags);
	/* Issue the READ command */
	M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);

	tm->tm_year	= bcd2bin(M48T59_READ(M48T59_YEAR));
	/* tm_mon is 0-11 */
	tm->tm_mon	= bcd2bin(M48T59_READ(M48T59_MONTH)) - 1;
	tm->tm_mday	= bcd2bin(M48T59_READ(M48T59_MDAY));

	val = M48T59_READ(M48T59_WDAY);
	if ((pdata->type == M48T59RTC_TYPE_M48T59) &&
	    (val & M48T59_WDAY_CEB) && (val & M48T59_WDAY_CB)) {
		dev_dbg(dev, "Century bit is enabled\n");
		tm->tm_year += 100;	/* one century */
	}
#ifdef CONFIG_SPARC
	/* Sun SPARC machines count years since 1968 */
	tm->tm_year += 68;
#endif

	tm->tm_wday	= bcd2bin(val & 0x07);
	tm->tm_hour	= bcd2bin(M48T59_READ(M48T59_HOUR) & 0x3F);
	tm->tm_min	= bcd2bin(M48T59_READ(M48T59_MIN) & 0x7F);
	tm->tm_sec	= bcd2bin(M48T59_READ(M48T59_SEC) & 0x7F);

	/* Clear the READ bit */
	M48T59_CLEAR_BITS(M48T59_CNTL_READ, M48T59_CNTL);
	spin_unlock_irqrestore(&m48t59->lock, flags);

	dev_dbg(dev, "RTC read time %04d-%02d-%02d %02d/%02d/%02d\n",
		tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
		tm->tm_hour, tm->tm_min, tm->tm_sec);
	return rtc_valid_tm(tm);
}

static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
	unsigned int have_retried = 0;
	void __iomem *base = s3c_rtc_base;

	clk_enable(rtc_clk);
 retry_get_time:
	rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
	rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
	rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
	rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
	rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
	rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);

	/* the only way to work out whether the system was mid-update
	 * when we read it is to check the second counter, and if it
	 * is zero, then we re-try the entire read
	 */

	if (rtc_tm->tm_sec == 0 && !have_retried) {
		have_retried = 1;
		goto retry_get_time;
	}

	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);

	rtc_tm->tm_year += 100;

	dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
		 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
		 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);

	rtc_tm->tm_mon -= 1;

	clk_disable(rtc_clk);
	return rtc_valid_tm(rtc_tm);
}

/*
 * In order to set the CMOS clock precisely, set_rtc_mmss has to be
 * called 500 ms after the second nowtime has started, because when
 * nowtime is written into the registers of the CMOS clock, it will
 * jump to the next second precisely 500 ms later. Check the Motorola
 * MC146818A or Dallas DS12887 data sheet for details.
 */
int mach_set_rtc_mmss(const struct timespec *now)
{
	unsigned long nowtime = now->tv_sec;
	struct rtc_time tm;
	int retval = 0;

	rtc_time_to_tm(nowtime, &tm);
	if (!rtc_valid_tm(&tm)) {
		retval = set_rtc_time(&tm);
		if (retval)
			printk(KERN_ERR "%s: RTC write failed with error %d\n",
			       __func__, retval);
	} else {
		printk(KERN_ERR
		       "%s: Invalid RTC value: write of %lx to RTC failed\n",
			__func__, nowtime);
		retval = -EINVAL;
	}
	return retval;
}

static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
{
	int ret;
	uint8_t v[5];

	ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, v);
	if (ret != 0) {
		rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
		return ret;
	}

	rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100;
	rtc_tm->tm_mon  = (v[3] & DA9052_RTC_MONTH) - 1;
	rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY;
	rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR;
	rtc_tm->tm_min  = v[0] & DA9052_RTC_MIN;

	ret = rtc_valid_tm(rtc_tm);
	return ret;
}

static int isl12057_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct isl12057_rtc_data *data = dev_get_drvdata(dev);
	u8 regs[ISL12057_RTC_SEC_LEN];
	int ret;

	mutex_lock(&data->lock);
	ret = regmap_bulk_read(data->regmap, ISL12057_REG_RTC_SC, regs,
			       ISL12057_RTC_SEC_LEN);
	mutex_unlock(&data->lock);

	if (ret) {
		dev_err(dev, "%s: RTC read failed\n", __func__);
		return ret;
	}

	isl12057_rtc_regs_to_tm(tm, regs);

	return rtc_valid_tm(tm);
}

static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
{
	int ret;
	uint8_t v[5];

	ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);
	if (ret != 0) {
		dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);
		return ret;
	}

	rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;
	rtc_tm->tm_mon  = (v[3] & DA9055_RTC_ALM_MONTH) - 1;
	rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;
	rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;
	rtc_tm->tm_min  = v[0] & DA9055_RTC_ALM_MIN;
	rtc_tm->tm_sec = 0;

	return rtc_valid_tm(rtc_tm);
}

static int ds1343_read_time(struct device *dev, struct rtc_time *dt)
{
	struct ds1343_priv *priv = dev_get_drvdata(dev);
	unsigned char buf[7];
	int res;

	res = regmap_bulk_read(priv->map, DS1343_SECONDS_REG, buf, 7);
	if (res)
		return res;

	dt->tm_sec	= bcd2bin(buf[0]);
	dt->tm_min	= bcd2bin(buf[1]);
	dt->tm_hour	= bcd2bin(buf[2] & 0x3F);
	dt->tm_wday	= bcd2bin(buf[3]) - 1;
	dt->tm_mday	= bcd2bin(buf[4]);
	dt->tm_mon	= bcd2bin(buf[5] & 0x1F) - 1;
	dt->tm_year	= bcd2bin(buf[6]) + 100; /* year offset from 1900 */

	return rtc_valid_tm(dt);
}

static int max8997_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	u8 data[RTC_NR_TIME];
	int ret;

	mutex_lock(&info->lock);
	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
	mutex_unlock(&info->lock);

	if (ret < 0) {
		dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,
				ret);
		return ret;
	}

	max8997_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);

	return rtc_valid_tm(tm);
}

static int m41st85w_read_time(struct device *dev, struct rtc_time *dt)
{
    struct i2c_client *client = to_i2c_client(dev);
    u8 buf[7];
    int ret;
    unsigned int year, month, day, week, hour, minute, second;

    ret = i2c_smbus_read_i2c_block_data(client, 0x01, 7, buf);

    if (ret < 0)
        return ret;
    if (ret < 7)
        return -EIO;

    second = buf[0];
    minute = buf[1];
    hour = buf[2];
    week = buf[3];
    day = buf[4];
    month = buf[5];
    year = buf[6];

    dt->tm_sec = bcd2bin(second & 0x7f);
    dt->tm_min = bcd2bin(minute & 0x7f);
    dt->tm_hour = bcd2bin(hour & 0x3f);
    dt->tm_wday = bcd2bin(week & 0x07);
    dt->tm_mday = bcd2bin(day & 0x7f);
    dt->tm_mon = bcd2bin(month & 0x3f);
    dt->tm_year = bcd2bin(year);

    /* fix up values */
    /* dt->tm_mon is zero-based */
    dt->tm_mon--;
    /* year is 1900 + dt->tm_year */
    if (dt->tm_year < 95)
        dt->tm_year += 100;

    dt->tm_isdst = 0;

    return rtc_valid_tm(dt);
}

static int m48t35_read_time(struct device *dev, struct rtc_time *tm)
{
	struct m48t35_priv *priv = dev_get_drvdata(dev);
	u8 control;

	/*
	 * Only the values that we read from the RTC are set. We leave
	 * tm_wday, tm_yday and tm_isdst untouched. Even though the
	 * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
	 * by the RTC when initially set to a non-zero value.
	 */
	spin_lock_irq(&priv->lock);
	control = readb(&priv->reg->control);
	writeb(control | M48T35_RTC_READ, &priv->reg->control);
	tm->tm_sec = readb(&priv->reg->sec);
	tm->tm_min = readb(&priv->reg->min);
	tm->tm_hour = readb(&priv->reg->hour);
	tm->tm_mday = readb(&priv->reg->date);
	tm->tm_mon = readb(&priv->reg->month);
	tm->tm_year = readb(&priv->reg->year);
	writeb(control, &priv->reg->control);
	spin_unlock_irq(&priv->lock);

	tm->tm_sec = bcd2bin(tm->tm_sec);
	tm->tm_min = bcd2bin(tm->tm_min);
	tm->tm_hour = bcd2bin(tm->tm_hour);
	tm->tm_mday = bcd2bin(tm->tm_mday);
	tm->tm_mon = bcd2bin(tm->tm_mon);
	tm->tm_year = bcd2bin(tm->tm_year);

	/*
	 * Account for differences between how the RTC uses the values
	 * and how they are defined in a struct rtc_time;
	 */
	tm->tm_year += 70;
	if (tm->tm_year <= 69)
		tm->tm_year += 100;

	tm->tm_mon--;
	return rtc_valid_tm(tm);
}

static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	unsigned long now;

	/*
	 * linux time is actual_time plus the offset saved in target_time
	 */
	now = in_be32(&regs->actual_time) + in_be32(&regs->target_time);

	rtc_time_to_tm(now, tm);

	/*
	 * update second minute hour registers
	 * so alarms will work
	 */
	mpc5121_rtc_update_smh(regs, tm);

	return rtc_valid_tm(tm);
}

static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	unsigned long now;

	/*
                                                                  
  */
	now = in_be32(&regs->actual_time) + in_be32(&regs->target_time);

	rtc_time_to_tm(now, tm);

	/*
                                       
                       
  */
	mpc5121_rtc_update_smh(regs, tm);

	return rtc_valid_tm(tm);
}

static int ds1302_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	tm->tm_sec	= bcd2bin(ds1302_readbyte(RTC_ADDR_SEC));
	tm->tm_min	= bcd2bin(ds1302_readbyte(RTC_ADDR_MIN));
	tm->tm_hour	= bcd2bin(ds1302_readbyte(RTC_ADDR_HOUR));
	tm->tm_wday	= bcd2bin(ds1302_readbyte(RTC_ADDR_DAY));
	tm->tm_mday	= bcd2bin(ds1302_readbyte(RTC_ADDR_DATE));
	tm->tm_mon	= bcd2bin(ds1302_readbyte(RTC_ADDR_MON)) - 1;
	tm->tm_year	= bcd2bin(ds1302_readbyte(RTC_ADDR_YEAR));

	if (tm->tm_year < 70)
		tm->tm_year += 100;

	dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
		"mday=%d, mon=%d, year=%d, wday=%d\n",
		__func__,
		tm->tm_sec, tm->tm_min, tm->tm_hour,
		tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);

	return rtc_valid_tm(tm);
}

/*
 * rtc_time's year contains the increment over 1900, but vRTC's YEAR
 * register can't be programmed to value larger than 0x64, so vRTC
 * driver chose to use 1972 (1970 is UNIX time start point) as the base,
 * and does the translation at read/write time.
 *
 * Why not just use 1970 as the offset? it's because using 1972 will
 * make it consistent in leap year setting for both vrtc and low-level
 * physical rtc devices. Then why not use 1960 as the offset? If we use
 * 1960, for a device's first use, its YEAR register is 0 and the system
 * year will be parsed as 1960 which is not a valid UNIX time and will
 * cause many applications to fail mysteriously.
 */
static int mrst_read_time(struct device *dev, struct rtc_time *time)
{
	unsigned long flags;

	if (vrtc_is_updating())
		mdelay(20);

	spin_lock_irqsave(&rtc_lock, flags);
	time->tm_sec = vrtc_cmos_read(RTC_SECONDS);
	time->tm_min = vrtc_cmos_read(RTC_MINUTES);
	time->tm_hour = vrtc_cmos_read(RTC_HOURS);
	time->tm_mday = vrtc_cmos_read(RTC_DAY_OF_MONTH);
	time->tm_mon = vrtc_cmos_read(RTC_MONTH);
	time->tm_year = vrtc_cmos_read(RTC_YEAR);
	spin_unlock_irqrestore(&rtc_lock, flags);

	/* Adjust for the 1972/1900 */
	time->tm_year += 72;
	time->tm_mon--;
	return rtc_valid_tm(time);
}

static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pcf50633_rtc *rtc;
	struct pcf50633_time pcf_tm;
	int ret = 0;

	rtc = dev_get_drvdata(dev);

	alrm->enabled = rtc->alarm_enabled;

	ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
				PCF50633_TI_EXTENT, &pcf_tm.time[0]);
	if (ret != PCF50633_TI_EXTENT) {
		dev_err(dev, "Failed to read time\n");
		return -EIO;
	}

	pcf2rtc_time(&alrm->time, &pcf_tm);

	return rtc_valid_tm(&alrm->time);
}