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generated by cgit v1.2.2 (git 2.25.0) at 2025-11-26 17:16:20 -0500
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// SPDX-License-Identifier: GPL-2.0
/*
 * FPGA Region - Device Tree support for FPGA programming under Linux
 *
 *  Copyright (C) 2013-2016 Altera Corporation
 *  Copyright (C) 2017 Intel Corporation
 */
#include <linux/fpga/fpga-bridge.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/fpga/fpga-region.h>
#include <linux/idr.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

static DEFINE_IDA(fpga_region_ida);
static struct class *fpga_region_class;

struct fpga_region *fpga_region_class_find(
	struct device *start, const void *data,
	int (*match)(struct device *, const void *))
{
	struct device *dev;

	dev = class_find_device(fpga_region_class, start, data, match);
	if (!dev)
		return NULL;

	return to_fpga_region(dev);
}
EXPORT_SYMBOL_GPL(fpga_region_class_find);

/**
 * fpga_region_get - get an exclusive reference to a fpga region
 * @region: FPGA Region struct
 *
 * Caller should call fpga_region_put() when done with region.
 *
 * Return fpga_region struct if successful.
 * Return -EBUSY if someone already has a reference to the region.
 * Return -ENODEV if @np is not a FPGA Region.
 */
static struct fpga_region *fpga_region_get(struct fpga_region *region)
{
	struct device *dev = &region->dev;

	if (!mutex_trylock(&region->mutex)) {
		dev_dbg(dev, "%s: FPGA Region already in use\n", __func__);
		return ERR_PTR(-EBUSY);
	}

	get_device(dev);
	if (!try_module_get(dev->parent->driver->owner)) {
		put_device(dev);
		mutex_unlock(&region->mutex);
		return ERR_PTR(-ENODEV);
	}