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drivers/rtc/rtc-pcf8563.c: add RTC_VL_READ/RTC_VL_CLR ioctl feature
Changes are based on arch/cris/arch-v10/drivers/pcf8563.c [akpm@linux-foundation.org: fix sparse warning] Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Mikael Starvik <starvik@axis.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Wu Fengguang <wfg@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 43 additions and 1 deletions
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@ -64,6 +64,7 @@ struct pcf8563 {
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* 1970...2069.
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*/
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int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
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int voltage_low; /* incicates if a low_voltage was detected */
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};
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/*
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@ -86,9 +87,11 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
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return -EIO;
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}
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if (buf[PCF8563_REG_SC] & PCF8563_SC_LV)
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if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
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pcf8563->voltage_low = 1;
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dev_info(&client->dev,
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"low voltage detected, date/time is not reliable.\n");
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}
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dev_dbg(&client->dev,
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"%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
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@ -173,6 +176,44 @@ static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
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return 0;
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}
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#ifdef CONFIG_RTC_INTF_DEV
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static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
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struct rtc_time tm;
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switch (cmd) {
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case RTC_VL_READ:
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if (pcf8563->voltage_low)
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dev_info(dev, "low voltage detected, date/time is not reliable.\n");
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if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
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sizeof(int)))
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return -EFAULT;
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return 0;
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case RTC_VL_CLR:
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/*
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* Clear the VL bit in the seconds register in case
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* the time has not been set already (which would
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* have cleared it). This does not really matter
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* because of the cached voltage_low value but do it
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* anyway for consistency.
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*/
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if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
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pcf8563_set_datetime(to_i2c_client(dev), &tm);
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/* Clear the cached value. */
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pcf8563->voltage_low = 0;
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return 0;
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default:
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return -ENOIOCTLCMD;
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}
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}
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#else
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#define pcf8563_rtc_ioctl NULL
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#endif
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static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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return pcf8563_get_datetime(to_i2c_client(dev), tm);
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@ -184,6 +225,7 @@ static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
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}
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static const struct rtc_class_ops pcf8563_rtc_ops = {
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.ioctl = pcf8563_rtc_ioctl,
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.read_time = pcf8563_rtc_read_time,
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.set_time = pcf8563_rtc_set_time,
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};
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