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rtc-pcf8523: add low battery voltage support
Implement reading of the battery voltage low signal for rtc-pcf8523. The bit is read-only and cannot be cleared by software, so no clear function is implemented. [akpm@linux-foundation.org: omit pcf8563_rtc_ioctl() if CONFIG_RTC_INTF_DEV=n] Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -23,6 +23,7 @@
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#define REG_CONTROL3_PM_VDD (1 << 6) /* switch-over disabled */
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#define REG_CONTROL3_PM_DSM (1 << 5) /* direct switching mode */
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#define REG_CONTROL3_PM_MASK 0xe0
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#define REG_CONTROL3_BLF (1 << 2) /* battery low bit, read-only */
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#define REG_SECONDS 0x03
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#define REG_SECONDS_OS (1 << 7)
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@ -250,9 +251,39 @@ static int pcf8523_rtc_set_time(struct device *dev, struct rtc_time *tm)
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return pcf8523_start_rtc(client);
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}
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#ifdef CONFIG_RTC_INTF_DEV
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static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd,
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unsigned long arg)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 value;
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int ret = 0, err;
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switch (cmd) {
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case RTC_VL_READ:
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err = pcf8523_read(client, REG_CONTROL3, &value);
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if (err < 0)
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return err;
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if (value & REG_CONTROL3_BLF)
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ret = 1;
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if (copy_to_user((void __user *)arg, &ret, sizeof(int)))
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return -EFAULT;
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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 pcf8523_rtc_ioctl NULL
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#endif
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static const struct rtc_class_ops pcf8523_rtc_ops = {
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.read_time = pcf8523_rtc_read_time,
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.set_time = pcf8523_rtc_set_time,
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.ioctl = pcf8523_rtc_ioctl,
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};
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static int pcf8523_probe(struct i2c_client *client,
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