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ptp: ocp: add tod_correction attribute

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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 <vadfed@fb.com>
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vadim Fedorenko 2022-03-02 13:34:57 -08:00 committed by David S. Miller
parent 2f23f486cf
commit 44a412d13b
1 changed files with 41 additions and 0 deletions
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41
drivers/ptp/ptp_ocp.c
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@ -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);