From 44a412d13b31fdfdb79e76f9c959e83f86dfe578 Mon Sep 17 00:00:00 2001 From: Vadim Fedorenko Date: Wed, 2 Mar 2022 13:34:57 -0800 Subject: ptp: ocp: add tod_correction attribute TOD correction register is used to compensate for leap seconds in different domains. Export it as an attribute with write access. Signed-off-by: Vadim Fedorenko Signed-off-by: Jonathan Lemon Signed-off-by: David S. Miller --- drivers/ptp/ptp_ocp.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) (limited to 'drivers') diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c index e9094dee78a4..bd872a616b94 100644 --- a/drivers/ptp/ptp_ocp.c +++ b/drivers/ptp/ptp_ocp.c @@ -1967,6 +1967,46 @@ clock_status_offset_show(struct device *dev, } static DEVICE_ATTR_RO(clock_status_offset); +static ssize_t +tod_correction_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ptp_ocp *bp = dev_get_drvdata(dev); + u32 val; + int res; + + val = ioread32(&bp->tod->adj_sec); + res = (val & ~INT_MAX) ? -1 : 1; + res *= (val & INT_MAX); + return sysfs_emit(buf, "%d\n", res); +} + +static ssize_t +tod_correction_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ptp_ocp *bp = dev_get_drvdata(dev); + unsigned long flags; + int err, res; + u32 val = 0; + + err = kstrtos32(buf, 0, &res); + if (err) + return err; + if (res < 0) { + res *= -1; + val |= BIT(31); + } + val |= res; + + spin_lock_irqsave(&bp->lock, flags); + iowrite32(val, &bp->tod->adj_sec); + spin_unlock_irqrestore(&bp->lock, flags); + + return count; +} +static DEVICE_ATTR_RW(tod_correction); + static struct attribute *timecard_attrs[] = { &dev_attr_serialnum.attr, &dev_attr_gnss_sync.attr, @@ -1983,6 +2023,7 @@ static struct attribute *timecard_attrs[] = { &dev_attr_irig_b_mode.attr, &dev_attr_utc_tai_offset.attr, &dev_attr_ts_window_adjust.attr, + &dev_attr_tod_correction.attr, NULL, }; ATTRIBUTE_GROUPS(timecard); -- cgit v1.2.3