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/* Copyright (c) 2002-3 Patrick Mochel
* Copyright (c) 2002-3 Open Source Development Labs
* Copyright (c) 2012, The Linux Foundation. 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>
#include <linux/string.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->res;
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);
#define SPMI_MAX_RES_NAME 256
/**
* spmi_get_resource_byname - get a resource for a device given a name
* @dev: spmi device handle
* @node: device node resource
* @type: resource type
* @name: resource name to lookup
*/
struct resource *spmi_get_resource_byname(struct spmi_device *dev,
struct spmi_resource *node,
unsigned int type,
const char *name)
{
int i;
/* if a node is not specified, default to the first node */
if (!node)
node = &dev->res;
for (i = 0; i < node->num_resources; i++) {
struct resource *r = &node->resource[i];
if (type == resource_type(r) && r->name &&
!strncmp(r->name, name, SPMI_MAX_RES_NAME))
return r;
}
return NULL;
}
EXPORT_SYMBOL_GPL(spmi_get_resource_byname);
/**
* 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);
/**
* spmi_get_irq_byname - get an IRQ for a device given a name
* @dev: spmi device handle
* @node: device node resource
* @name: resource name to lookup
*
* Returns -ENXIO on failure
*/
int spmi_get_irq_byname(struct spmi_device *dev,
struct spmi_resource *node, const char *name)
{
struct resource *r = spmi_get_resource_byname(dev, node,
IORESOURCE_IRQ, name);
return r ? r->start : -ENXIO;
}
EXPORT_SYMBOL_GPL(spmi_get_irq_byname);
/*
* spmi_get_container_dev_byname - get a device node resource
* @dev: spmi device handle
* @label: device name to lookup
*
* Only useable in spmi-dev-container configurations. Given a name,
* find the associated spmi_resource that matches the name.
*
* Return NULL if the spmi_device is not a dev-container,
* or if the lookup fails.
*/
struct spmi_resource *spmi_get_dev_container_byname(struct spmi_device *dev,
const char *label)
{
int i;
if (!label)
return NULL;
for (i = 0; i < dev->num_dev_node; i++) {
struct spmi_resource *r = &dev->dev_node[i];
if (r && r->label && !strncmp(r->label,
label, SPMI_MAX_RES_NAME))
return r;
}
return NULL;
}
EXPORT_SYMBOL(spmi_get_dev_container_byname);
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