drivers/fsi: Add fsi master definition

#include <linux/device.h>

#include <linux/fsi.h>

#include <linux/idr.h>

#include <linux/module.h>

#include "fsi-master.h"

static DEFINE_IDA(master_ida);

/* FSI master support */

int fsi_master_register(struct fsi_master *master)

{

	int rc;

	if (!master)

		return -EINVAL;

	master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);

	dev_set_name(&master->dev, "fsi%d", master->idx);

	rc = device_register(&master->dev);

	if (rc)

		ida_simple_remove(&master_ida, master->idx);

	return rc;

}

EXPORT_SYMBOL_GPL(fsi_master_register);

void fsi_master_unregister(struct fsi_master *master)

{

	if (master->idx >= 0) {

		ida_simple_remove(&master_ida, master->idx);

		master->idx = -1;

	}

	device_unregister(&master->dev);

}

EXPORT_SYMBOL_GPL(fsi_master_unregister);

/* FSI core & Linux bus type definitions */

static int fsi_bus_match(struct device *dev, struct device_driver *drv)

/*

 * FSI master definitions. These comprise the core <--> master interface,

 * to allow the core to interact with the (hardware-specific) masters.

 *

 * Copyright (C) IBM Corporation 2016

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

#ifndef DRIVERS_FSI_MASTER_H

#define DRIVERS_FSI_MASTER_H

#include <linux/device.h>

struct fsi_master {

	struct device	dev;

	int		idx;

	int		n_links;

	int		flags;

	int		(*read)(struct fsi_master *, int link, uint8_t id,

				uint32_t addr, void *val, size_t size);

	int		(*write)(struct fsi_master *, int link, uint8_t id,

				uint32_t addr, const void *val, size_t size);

	int		(*term)(struct fsi_master *, int link, uint8_t id);

	int		(*send_break)(struct fsi_master *, int link);

	int		(*link_enable)(struct fsi_master *, int link);

};

#define dev_to_fsi_master(d) container_of(d, struct fsi_master, dev)

extern int fsi_master_register(struct fsi_master *master);

extern void fsi_master_unregister(struct fsi_master *master);

#endif /* DRIVERS_FSI_MASTER_H */