rtc: isl12022: implement RTC_VL_READ ioctl
Hook up support for reading the values of the SR_LBAT85 and SR_LBAT75 bits. Translate the former to "battery low", and the latter to "battery empty or not-present". Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Link: https://lore.kernel.org/r/20230615105826.411953-6-linux@rasmusvillemoes.dk Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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@ -204,7 +204,34 @@ static int isl12022_rtc_set_time(struct device *dev, struct rtc_time *tm)
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return regmap_bulk_write(regmap, ISL12022_REG_SC, buf, sizeof(buf));
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}
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static int isl12022_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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struct regmap *regmap = dev_get_drvdata(dev);
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u32 user, val;
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int ret;
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switch (cmd) {
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case RTC_VL_READ:
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ret = regmap_read(regmap, ISL12022_REG_SR, &val);
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if (ret)
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return ret;
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user = 0;
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if (val & ISL12022_SR_LBAT85)
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user |= RTC_VL_BACKUP_LOW;
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if (val & ISL12022_SR_LBAT75)
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user |= RTC_VL_BACKUP_EMPTY;
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return put_user(user, (u32 __user *)arg);
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default:
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return -ENOIOCTLCMD;
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}
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}
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static const struct rtc_class_ops isl12022_rtc_ops = {
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.ioctl = isl12022_rtc_ioctl,
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.read_time = isl12022_rtc_read_time,
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.set_time = isl12022_rtc_set_time,
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};
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