From patchwork Fri Mar 2 09:36:39 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: drivers/rtc/rtc-r9701.c: reset registers if invalid values are detected Date: Thu, 01 Mar 2012 23:36:39 -0000 From: Anatolij Gustschin X-Patchwork-Id: 144168 Message-Id: <1330680999-4434-1-git-send-email-agust@denx.de> To: rtc-linux@googlegroups.com Cc: Andreas Dumberger , Alessandro Zummo From: Andreas Dumberger hwclock refuses to set date/time if RTC registers contain invalid valies. Check the date/time register values at probe time and pre- initialize them to make hwclock happy. Signed-off-by: Andreas Dumberger Signed-off-by: Anatolij Gustschin Cc: Alessandro Zummo --- drivers/rtc/rtc-r9701.c | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-) diff --git a/drivers/rtc/rtc-r9701.c b/drivers/rtc/rtc-r9701.c index 2853c2a..3b911b3 100644 --- a/drivers/rtc/rtc-r9701.c +++ b/drivers/rtc/rtc-r9701.c @@ -122,6 +122,7 @@ static const struct rtc_class_ops r9701_rtc_ops = { static int __devinit r9701_probe(struct spi_device *spi) { struct rtc_device *rtc; + struct rtc_time dt; unsigned char tmp; int res; @@ -132,6 +133,27 @@ static int __devinit r9701_probe(struct spi_device *spi) return -ENODEV; } + /* + * The device seems to be present. Now check if the registers + * contain invalid values. If so, try to write a default date: + * 2000/1/1 00:00:00 + */ + r9701_get_datetime(&spi->dev, &dt); + if (rtc_valid_tm(&dt)) { + dev_info(&spi->dev, "trying to repair invalid date/time\n"); + dt.tm_sec = 0; + dt.tm_min = 0; + dt.tm_hour = 0; + dt.tm_mday = 1; + dt.tm_mon = 0; + dt.tm_year = 100; + + if (r9701_set_datetime(&spi->dev, &dt)) { + dev_err(&spi->dev, "cannot repair RTC register\n"); + return -ENODEV; + } + } + rtc = rtc_device_register("r9701", &spi->dev, &r9701_rtc_ops, THIS_MODULE); if (IS_ERR(rtc))