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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Support for generic time stamping devices on MII buses.
* Copyright (C) 2018 Richard Cochran <richardcochran@gmail.com>
*/
#ifndef _LINUX_MII_TIMESTAMPER_H
#define _LINUX_MII_TIMESTAMPER_H
#include <linux/device.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
struct phy_device;
/**
* struct mii_timestamper - Callback interface to MII time stamping devices.
*
* @rxtstamp: Requests a Rx timestamp for 'skb'. If the skb is accepted,
* the MII time stamping device promises to deliver it using
* netif_rx() as soon as a timestamp becomes available. One of
* the PTP_CLASS_ values is passed in 'type'. The function
* must return true if the skb is accepted for delivery.
*
* @txtstamp: Requests a Tx timestamp for 'skb'. The MII time stamping
* device promises to deliver it using skb_complete_tx_timestamp()
* as soon as a timestamp becomes available. One of the PTP_CLASS_
* values is passed in 'type'.
*
* @hwtstamp: Handles SIOCSHWTSTAMP ioctl for hardware time stamping.
*
* @link_state: Allows the device to respond to changes in the link
* state. The caller invokes this function while holding
* the phy_device mutex.
*
* @ts_info: Handles ethtool queries for hardware time stamping.
* @device: Remembers the device to which the instance belongs.
*
* Drivers for PHY time stamping devices should embed their
* mii_timestamper within a private structure, obtaining a reference
* to it using container_of().
*
* Drivers for non-PHY time stamping devices should return a pointer
* to a mii_timestamper from the probe_channel() callback of their
* mii_timestamping_ctrl interface.
*/
struct mii_timestamper {
bool (*rxtstamp)(struct mii_timestamper *mii_ts,
struct sk_buff *skb, int type);
void (*txtstamp)(struct mii_timestamper *mii_ts,
struct sk_buff *skb, int type);
int (*hwtstamp)(struct mii_timestamper *mii_ts,
struct ifreq *ifreq);
void (*link_state)(struct mii_timestamper *mii_ts,
struct phy_device *phydev);
int (*ts_info)(struct mii_timestamper *mii_ts,
struct ethtool_ts_info *ts_info);
struct device *device;
};
/**
* struct mii_timestamping_ctrl - MII time stamping controller interface.
*
* @probe_channel: Callback into the controller driver announcing the
* presence of the 'port' channel. The 'device' field
* had been passed to register_mii_tstamp_controller().
* The driver must return either a pointer to a valid
* MII timestamper instance or PTR_ERR.
*
* @release_channel: Releases an instance obtained via .probe_channel.
*/
struct mii_timestamping_ctrl {
struct mii_timestamper *(*probe_channel)(struct device *device,
unsigned int port);
void (*release_channel)(struct device *device,
struct mii_timestamper *mii_ts);
};
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
int register_mii_tstamp_controller(struct device *device,
struct mii_timestamping_ctrl *ctrl);
void unregister_mii_tstamp_controller(struct device *device);
struct mii_timestamper *register_mii_timestamper(struct device_node *node,
unsigned int port);
void unregister_mii_timestamper(struct mii_timestamper *mii_ts);
#else
static inline
int register_mii_tstamp_controller(struct device *device,
struct mii_timestamping_ctrl *ctrl)
{
return -EOPNOTSUPP;
}
static inline void unregister_mii_tstamp_controller(struct device *device)
{
}
static inline
struct mii_timestamper *register_mii_timestamper(struct device_node *node,
unsigned int port)
{
return NULL;
}
static inline void unregister_mii_timestamper(struct mii_timestamper *mii_ts)
{
}
#endif
#endif
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