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/* Copyright (c) 2014, 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.
*/
#include <linux/esoc_client.h>
#include <linux/of.h>
#include <linux/spinlock.h>
#include "esoc.h"
static DEFINE_SPINLOCK(notify_lock);
static ATOMIC_NOTIFIER_HEAD(client_notify);
static void devm_esoc_desc_release(struct device *dev, void *res)
{
struct esoc_desc *esoc_desc = res;
kfree(esoc_desc->name);
kfree(esoc_desc->link);
put_esoc_clink(esoc_desc->priv);
}
static int devm_esoc_desc_match(struct device *dev, void *res, void *data)
{
struct esoc_desc *esoc_desc = res;
return esoc_desc == data;
}
struct esoc_desc *devm_register_esoc_client(struct device *dev,
const char *name)
{
int ret, index;
const char *client_desc;
char *esoc_prop;
const __be32 *parp;
struct device_node *esoc_node;
struct device_node *np = dev->of_node;
struct esoc_clink *esoc_clink;
struct esoc_desc *desc;
char *esoc_name, *esoc_link;
for (index = 0;; index++) {
esoc_prop = kasprintf(GFP_KERNEL, "esoc-%d", index);
parp = of_get_property(np, esoc_prop, NULL);
if (parp == NULL) {
dev_err(dev, "esoc device not present\n");
kfree(esoc_prop);
return NULL;
}
ret = of_property_read_string_index(np, "esoc-names", index,
&client_desc);
if (ret) {
dev_err(dev, "cannot find matching string\n");
kfree(esoc_prop);
return NULL;
}
if (strcmp(client_desc, name)) {
kfree(esoc_prop);
continue;
}
kfree(esoc_prop);
esoc_node = of_find_node_by_phandle(be32_to_cpup(parp));
esoc_clink = get_esoc_clink_by_node(esoc_node);
if (IS_ERR_OR_NULL(esoc_clink)) {
dev_err(dev, "matching esoc clink not present\n");
return ERR_PTR(-EPROBE_DEFER);
}
esoc_name = kasprintf(GFP_KERNEL, "esoc%d",
esoc_clink->id);
if (IS_ERR_OR_NULL(esoc_name)) {
dev_err(dev, "unable to allocate esoc name\n");
return ERR_PTR(-ENOMEM);
}
esoc_link = kasprintf(GFP_KERNEL, "%s", esoc_clink->link_name);
if (IS_ERR_OR_NULL(esoc_link)) {
dev_err(dev, "unable to allocate esoc link name\n");
kfree(esoc_name);
return ERR_PTR(-ENOMEM);
}
desc = devres_alloc(devm_esoc_desc_release,
sizeof(*desc), GFP_KERNEL);
if (IS_ERR_OR_NULL(desc)) {
kfree(esoc_name);
kfree(esoc_link);
dev_err(dev, "unable to allocate esoc descriptor\n");
return ERR_PTR(-ENOMEM);
}
desc->name = esoc_name;
desc->link = esoc_link;
desc->priv = esoc_clink;
devres_add(dev, desc);
return desc;
}
return NULL;
}
EXPORT_SYMBOL(devm_register_esoc_client);
void devm_unregister_esoc_client(struct device *dev,
struct esoc_desc *esoc_desc)
{
int ret;
ret = devres_release(dev, devm_esoc_desc_release,
devm_esoc_desc_match, esoc_desc);
WARN_ON(ret);
}
EXPORT_SYMBOL(devm_unregister_esoc_client);
int esoc_register_client_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&client_notify, nb);
}
EXPORT_SYMBOL(esoc_register_client_notifier);
void notify_esoc_clients(struct esoc_clink *esoc_clink, unsigned long evt)
{
unsigned int id;
unsigned long flags;
spin_lock_irqsave(¬ify_lock, flags);
id = esoc_clink->id;
atomic_notifier_call_chain(&client_notify, evt, &id);
spin_unlock_irqrestore(¬ify_lock, flags);
}
EXPORT_SYMBOL(notify_esoc_clients);
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