include/linux/fpga/fpga-bridge.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _LINUX_FPGA_BRIDGE_H
#define _LINUX_FPGA_BRIDGE_H

#include <linux/device.h>
#include <linux/fpga/fpga-mgr.h>

struct fpga_bridge;

/**
 * struct fpga_bridge_ops - ops for low level FPGA bridge drivers
 * @enable_show: returns the FPGA bridge's status
 * @enable_set: set an FPGA bridge as enabled or disabled
 * @fpga_bridge_remove: set FPGA into a specific state during driver remove
 * @groups: optional attribute groups.
 */
struct fpga_bridge_ops {
	int (*enable_show)(struct fpga_bridge *bridge);
	int (*enable_set)(struct fpga_bridge *bridge, bool enable);
	void (*fpga_bridge_remove)(struct fpga_bridge *bridge);
	const struct attribute_group **groups;
};

/**
 * struct fpga_bridge_info - collection of parameters an FPGA Bridge
 * @name: fpga bridge name
 * @br_ops: pointer to structure of fpga bridge ops
 * @priv: fpga bridge private data
 *
 * fpga_bridge_info contains parameters for the register function. These
 * are separated into an info structure because they some are optional
 * others could be added to in the future. The info structure facilitates
 * maintaining a stable API.
 */
struct fpga_bridge_info {
	const char *name;
	const struct fpga_bridge_ops *br_ops;
	void *priv;
};

/**
 * struct fpga_bridge - FPGA bridge structure
 * @name: name of low level FPGA bridge
 * @dev: FPGA bridge device
 * @mutex: enforces exclusive reference to bridge
 * @br_ops: pointer to struct of FPGA bridge ops
 * @br_ops_owner: module containing the br_ops
 * @info: fpga image specific information
 * @node: FPGA bridge list node
 * @priv: low level driver private date
 */
struct fpga_bridge {
	const char *name;
	struct device dev;
	struct mutex mutex; /* for exclusive reference to bridge */
	const struct fpga_bridge_ops *br_ops;
	struct module *br_ops_owner;
	struct fpga_image_info *info;
	struct list_head node;
	void *priv;
};

#define to_fpga_bridge(d) container_of(d, struct fpga_bridge, dev)

struct fpga_bridge *of_fpga_bridge_get(struct device_node *node,
				       struct fpga_image_info *info);
struct fpga_bridge *fpga_bridge_get(struct device *dev,
				    struct fpga_image_info *info);
void fpga_bridge_put(struct fpga_bridge *bridge);
int fpga_bridge_enable(struct fpga_bridge *bridge);
int fpga_bridge_disable(struct fpga_bridge *bridge);

int fpga_bridges_enable(struct list_head *bridge_list);
int fpga_bridges_disable(struct list_head *bridge_list);
void fpga_bridges_put(struct list_head *bridge_list);
int fpga_bridge_get_to_list(struct device *dev,
			    struct fpga_image_info *info,
			    struct list_head *bridge_list);
int of_fpga_bridge_get_to_list(struct device_node *np,
			       struct fpga_image_info *info,
			       struct list_head *bridge_list);

#define fpga_bridge_register(parent, name, br_ops, priv) \
	__fpga_bridge_register(parent, name, br_ops, priv, THIS_MODULE)
struct fpga_bridge *
__fpga_bridge_register(struct device *parent, const char *name,
		       const struct fpga_bridge_ops *br_ops, void *priv,
		       struct module *owner);
void fpga_bridge_unregister(struct fpga_bridge *br);

#endif /* _LINUX_FPGA_BRIDGE_H */