/* Driver Manager Driver Interface Implementation.
 *
 * COPYRIGHT (c) 2009.
 * Cobham Gaisler AB.
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.com/license/LICENSE.
 *
 */

/*
 * This is the part the device driver API, the functions rely on that the
 * parent bus driver has implemented the neccessary operations correctly.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <drvmgr/drvmgr.h>
#include "drvmgr_internal.h"

/* Get device pointer from knowing the Driver and the Driver minor
 * that was assigned to it
 */
int drvmgr_get_dev(
	struct drvmgr_drv *drv,
	int minor,
	struct drvmgr_dev **pdev)
{
	struct drvmgr_dev *dev;
	if (!drv)
		return -1;

	DRVMGR_LOCK_READ();
	dev = drv->dev;
	while (dev) {
		if (dev->minor_drv == minor)
			break;
		dev = dev->next_in_drv;
	}
	DRVMGR_UNLOCK();
	if (!dev)
		return -1;
	if (pdev)
		*pdev = dev;
	return 0;
}

/* Get Bus frequency in HZ from bus driver */
int drvmgr_freq_get(
	struct drvmgr_dev *dev,
	int options,
	unsigned int *freq_hz)
{
	if (!dev || !dev->parent || !dev->parent->ops->freq_get)
		return -1;

	return dev->parent->ops->freq_get(dev, options, freq_hz);
}

/* Get driver prefix */
int drvmgr_get_dev_prefix(struct drvmgr_dev *dev, char *dev_prefix)
{
	struct drvmgr_bus_params params;
	if (!dev || !dev->parent || !dev->parent->ops->get_params)
		return -1;

	dev->parent->ops->get_params(dev, &params);
	if (!params.dev_prefix)
		return -1;
	if (dev_prefix)
		strcpy(dev_prefix, params.dev_prefix);
	return 0;
}

/* Register an interrupt */
int drvmgr_interrupt_register(
	struct drvmgr_dev *dev,
	int index,
	const char *info,
	drvmgr_isr isr,
	void *arg)
{
	if (!dev || !dev->parent || !dev->parent->ops->int_register)
		return -1;

	if (!isr)
		return -1;

	return dev->parent->ops->int_register(dev, index, info, isr, arg);
}

/* Unregister an interrupt */
int drvmgr_interrupt_unregister(
	struct drvmgr_dev *dev,
	int index,
	drvmgr_isr isr,
	void *arg)
{
	if (!dev || !dev->parent || !dev->parent->ops->int_unregister)
		return -1;

	if (!isr)
		return -1;

	return dev->parent->ops->int_unregister(dev, index, isr, arg);
}

int drvmgr_interrupt_clear(
	struct drvmgr_dev *dev,
	int index)
{
	if (!dev || !dev->parent || !dev->parent->ops->int_clear)
		return -1;

	return dev->parent->ops->int_clear(dev, index);
}

int drvmgr_interrupt_unmask(
	struct drvmgr_dev *dev,
	int index)
{
	if (!dev || !dev->parent || !dev->parent->ops->int_unmask)
		return -1;

	return dev->parent->ops->int_unmask(dev, index);
}

int drvmgr_interrupt_mask(
	struct drvmgr_dev *dev,
	int index)
{
	if (!dev || !dev->parent || !dev->parent->ops->int_mask)
		return -1;

	return dev->parent->ops->int_mask(dev, index);
}

int drvmgr_on_rootbus(struct drvmgr_dev *dev)
{
	if (dev->parent && dev->parent->dev && dev->parent->dev->parent)
		return 0;
	else
		return 1;
}