drivers/spmi/spmi-resources.c

/* Copyright (c) 2002-3 Patrick Mochel
 * Copyright (c) 2002-3 Open Source Development Labs
 * Copyright (c) 2012, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only 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.
 *
 * Resource handling based on platform.c.
 */

#include <linux/export.h>
#include <linux/spmi.h>

/**
 * spmi_get_resource - get a resource for a device
 * @dev: spmi device
 * @node: device node resource
 * @type: resource type
 * @res_num: resource index
 *
 * If 'node' is specified as NULL, then the API treats this as a special
 * case to assume the first devnode. For configurations that do not use
 * spmi-dev-container, there is only one node to begin with, so NULL should
 * be passed in this case.
 *
 * Returns
 *  NULL on failure.
 */
struct resource *spmi_get_resource(struct spmi_device *dev,
				   struct spmi_resource *node,
				   unsigned int type, unsigned int res_num)
{
	int i;

	/* if a node is not specified, default to the first node */
	if (!node)
		node = &dev->dev_node[0];

	for (i = 0; i < node->num_resources; i++) {
		struct resource *r = &node->resource[i];

		if (type == resource_type(r) && res_num-- == 0)
			return r;
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(spmi_get_resource);

/**
 * spmi_get_irq - get an IRQ for a device
 * @dev: spmi device
 * @node: device node resource
 * @res_num: IRQ number index
 *
 * Returns
 *  -ENXIO on failure.
 */
int spmi_get_irq(struct spmi_device *dev, struct spmi_resource *node,
					  unsigned int res_num)
{
	struct resource *r = spmi_get_resource(dev, node,
						IORESOURCE_IRQ, res_num);

	return r ? r->start : -ENXIO;
}
EXPORT_SYMBOL_GPL(spmi_get_irq);