linux/drivers/thunderbolt/ctl.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Thunderbolt driver - control channel and configuration commands
 *
 * Copyright (c) 2014 Andreas Noever <[email protected]>
 * Copyright (C) 2018, Intel Corporation
 */

#ifndef _TB_CFG
#define _TB_CFG

#include <linux/kref.h>
#include <linux/thunderbolt.h>

#include "nhi.h"
#include "tb_msgs.h"

/* control channel */
struct tb_ctl;

event_cb;

struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, int index, int timeout_msec,
			    event_cb cb, void *cb_data);
void tb_ctl_start(struct tb_ctl *ctl);
void tb_ctl_stop(struct tb_ctl *ctl);
void tb_ctl_free(struct tb_ctl *ctl);

/* configuration commands */

struct tb_cfg_result { … };

struct ctl_pkg { … };

/**
 * struct tb_cfg_request - Control channel request
 * @kref: Reference count
 * @ctl: Pointer to the control channel structure. Only set when the
 *	 request is queued.
 * @request_size: Size of the request packet (in bytes)
 * @request_type: Type of the request packet
 * @response: Response is stored here
 * @response_size: Maximum size of one response packet
 * @response_type: Expected type of the response packet
 * @npackets: Number of packets expected to be returned with this request
 * @match: Function used to match the incoming packet
 * @copy: Function used to copy the incoming packet to @response
 * @callback: Callback called when the request is finished successfully
 * @callback_data: Data to be passed to @callback
 * @flags: Flags for the request
 * @work: Work item used to complete the request
 * @result: Result after the request has been completed
 * @list: Requests are queued using this field
 *
 * An arbitrary request over Thunderbolt control channel. For standard
 * control channel message, one should use tb_cfg_read/write() and
 * friends if possible.
 */
struct tb_cfg_request { … };

#define TB_CFG_REQUEST_ACTIVE …
#define TB_CFG_REQUEST_CANCELED …

struct tb_cfg_request *tb_cfg_request_alloc(void);
void tb_cfg_request_get(struct tb_cfg_request *req);
void tb_cfg_request_put(struct tb_cfg_request *req);
int tb_cfg_request(struct tb_ctl *ctl, struct tb_cfg_request *req,
		   void (*callback)(void *), void *callback_data);
void tb_cfg_request_cancel(struct tb_cfg_request *req, int err);
struct tb_cfg_result tb_cfg_request_sync(struct tb_ctl *ctl,
			struct tb_cfg_request *req, int timeout_msec);

static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header)
{ … }

static inline struct tb_cfg_header tb_cfg_make_header(u64 route)
{ … }

int tb_cfg_ack_notification(struct tb_ctl *ctl, u64 route,
			    const struct cfg_error_pkg *error);
int tb_cfg_ack_plug(struct tb_ctl *ctl, u64 route, u32 port, bool unplug);
struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route);
struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,
				     u64 route, u32 port,
				     enum tb_cfg_space space, u32 offset,
				     u32 length, int timeout_msec);
struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer,
				      u64 route, u32 port,
				      enum tb_cfg_space space, u32 offset,
				      u32 length, int timeout_msec);
int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
		enum tb_cfg_space space, u32 offset, u32 length);
int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port,
		 enum tb_cfg_space space, u32 offset, u32 length);
int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route);


#endif