coreboot_table.c

/*
 * coreboot_table.c
 *
 * Module providing coreboot table access.
 *
 * Copyright 2017 Google Inc.
 * Copyright 2017 Samuel Holland <samuel@sholland.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License v2.0 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.
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>

#include "coreboot_table.h"

#define CB_DEV(d) container_of(d, struct coreboot_device, dev)
#define CB_DRV(d) container_of(d, struct coreboot_driver, drv)

static struct coreboot_table_header __iomem *ptr_header;

static int coreboot_bus_match(struct device *dev, struct device_driver *drv)
{
	struct coreboot_device *device = CB_DEV(dev);
	struct coreboot_driver *driver = CB_DRV(drv);

	return device->entry.tag == driver->tag;
}

static int coreboot_bus_probe(struct device *dev)
{
	int ret = -ENODEV;
	struct coreboot_device *device = CB_DEV(dev);
	struct coreboot_driver *driver = CB_DRV(dev->driver);

	if (driver->probe)
		ret = driver->probe(device);

	return ret;
}

static int coreboot_bus_remove(struct device *dev)
{
	int ret = 0;
	struct coreboot_device *device = CB_DEV(dev);
	struct coreboot_driver *driver = CB_DRV(dev->driver);

	if (driver->remove)
		ret = driver->remove(device);

	return ret;
}

static struct bus_type coreboot_bus_type = {
	.name		= "coreboot",
	.match		= coreboot_bus_match,
	.probe		= coreboot_bus_probe,
	.remove		= coreboot_bus_remove,