Commit 89260d87 authored by Jonathan Lemon's avatar Jonathan Lemon Committed by David S. Miller
Browse files

ptp: ocp: Add sysfs attribute utc_tai_offset 



IRIG and DCF output time in UTC, but the timecard operates
on TAI internally.  Add an attribute node which allows adding
an offset to these modes before output.

Signed-off-by: default avatarJonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d14ee252

drivers/ptp/ptp_ocp.c

+48 −1
Original line number Diff line number Diff line
@@ -230,8 +230,9 @@ struct ptp_ocp { 
	int			gnss_port;

	int			mac_port;	/* miniature atomic clock */

	u8			serial[6];

	int			flash_start;

	bool			has_serial;

	int			flash_start;

	u32			utc_tai_offset;

};



struct ocp_resource {
@@ -741,6 +742,23 @@ ptp_ocp_init_clock(struct ptp_ocp *bp) 
	return 0;

}



static void

ptp_ocp_utc_distribute(struct ptp_ocp *bp, u32 val)

{

	unsigned long flags;



	spin_lock_irqsave(&bp->lock, flags);



	bp->utc_tai_offset = val;



	if (bp->irig_out)

		iowrite32(val, &bp->irig_out->adj_sec);

	if (bp->dcf_out)

		iowrite32(val, &bp->dcf_out->adj_sec);



	spin_unlock_irqrestore(&bp->lock, flags);

}



static void

ptp_ocp_tod_info(struct ptp_ocp *bp)

{
@@ -1676,6 +1694,34 @@ gnss_sync_show(struct device *dev, struct device_attribute *attr, char *buf) 
}

static DEVICE_ATTR_RO(gnss_sync);



static ssize_t

utc_tai_offset_show(struct device *dev,

		    struct device_attribute *attr, char *buf)

{

	struct ptp_ocp *bp = dev_get_drvdata(dev);



	return sysfs_emit(buf, "%d\n", bp->utc_tai_offset);

}



static ssize_t

utc_tai_offset_store(struct device *dev,

		     struct device_attribute *attr,

		     const char *buf, size_t count)

{

	struct ptp_ocp *bp = dev_get_drvdata(dev);

	int err;

	u32 val;



	err = kstrtou32(buf, 0, &val);

	if (err)

		return err;



	ptp_ocp_utc_distribute(bp, val);



	return count;

}

static DEVICE_ATTR_RW(utc_tai_offset);



static ssize_t

irig_b_mode_show(struct device *dev, struct device_attribute *attr, char *buf)

{
@@ -1769,6 +1815,7 @@ static struct attribute *timecard_attrs[] = { 
	&dev_attr_available_sma_inputs.attr,

	&dev_attr_available_sma_outputs.attr,

	&dev_attr_irig_b_mode.attr,

	&dev_attr_utc_tai_offset.attr,

	NULL,

};

ATTRIBUTE_GROUPS(timecard);