linux/drivers/mfd/mfd-core.c

/*
 * drivers/mfd/mfd-core.c
 *
 * core MFD support
 * Copyright (c) 2006 Ian Molton
 * Copyright (c) 2007,2008 Dmitry Baryshkov
 *
 * 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.
 *
 */

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>

static int mfd_add_device(struct platform_device *parent,
		const struct mfd_cell *cell,
		struct resource *mem_base,
		int irq_base)
{
	struct resource res[cell->num_resources];
	struct platform_device *pdev;
	int ret = -ENOMEM;
	int r;

	pdev = platform_device_alloc(cell->name, parent->id);
	if (!pdev)
		goto fail_alloc;

	pdev->dev.parent = &parent->dev;

	ret = platform_device_add_data(pdev,
			cell, sizeof(struct mfd_cell));
	if (ret)
		goto fail_device;

	memset(res, 0, sizeof(res));
	for (r = 0; r < cell->num_resources; r++) {
		res[r].name = cell->resources[r].name;
		res[r].flags = cell->resources[r].flags;

		/* Find out base to use */
		if (cell->resources[r].flags & IORESOURCE_MEM) {
			res[r].parent = mem_base;
			res[r].start = mem_base->start +
				cell->resources[r].start;
			res[r].end = mem_base->start +
				cell->resources[r].end;
		} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
			res[r].start = irq_base +
				cell->resources[r].start;
			res[r].end   = irq_base +
				cell->resources[r].end;
		} else {
			res[r].parent = cell->resources[r].parent;
			res[r].start = cell->resources[r].start;
			res[r].end   = cell->resources[r].end;
		}
	}

	platform_device_add_resources(pdev, res, cell->num_resources);

	ret = platform_device_add(pdev);
	if (ret)
		goto fail_device;

	return 0;

/*	platform_device_del(pdev); */
fail_device:
	platform_device_put(pdev);
fail_alloc:
	return ret;
}

int mfd_add_devices(
		struct platform_device *parent,
		const struct mfd_cell *cells, int n_devs,
		struct resource *mem_base,
		int irq_base)
{
	int i;
	int ret = 0;

	for (i = 0; i < n_devs; i++) {
		ret = mfd_add_device(parent, cells + i, mem_base, irq_base);
		if (ret)
			break;
	}

	if (ret)
		mfd_remove_devices(parent);

	return ret;
}
EXPORT_SYMBOL(mfd_add_devices);

static int mfd_remove_devices_fn(struct device *dev, void *unused)
{
	platform_device_unregister(to_platform_device(dev));
	return 0;
}

void mfd_remove_devices(struct platform_device *parent)
{
	device_for_each_child(&parent->dev, NULL, mfd_remove_devices_fn);
}
EXPORT_SYMBOL(mfd_remove_devices);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");