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/*
* Copyright (c) 2010-2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* EXYNOS - SATA utility framework.
*
* 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/export.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/list.h>
#include "sata_phy.h"
static LIST_HEAD(phy_list);
static DEFINE_SPINLOCK(phy_lock);
struct sata_phy *sata_get_phy(enum sata_phy_type type)
{
struct sata_phy *x = NULL;
unsigned long flag;
if (list_empty(&phy_list))
return x;
spin_lock_irqsave(&phy_lock, flag);
list_for_each_entry(x, &phy_list, head) {
if (x->type == type) {
get_device(x->dev);
break;
}
}
spin_unlock_irqrestore(&phy_lock, flag);
return x;
}
EXPORT_SYMBOL(sata_get_phy);
int sata_add_phy(struct sata_phy *phy, enum sata_phy_type type)
{
unsigned long flag;
unsigned int ret = -EINVAL;
struct sata_phy *x;
spin_lock_irqsave(&phy_lock, flag);
if (!phy)
return ret;
list_for_each_entry(x, &phy_list, head) {
if (x->type == type) {
dev_err(phy->dev, "transceiver type already exists\n");
goto out;
}
}
phy->type = type;
list_add_tail(&phy->head, &phy_list);
ret = 0;
out:
spin_unlock_irqrestore(&phy_lock, flag);
return ret;
}
EXPORT_SYMBOL(sata_add_phy);
void sata_remove_phy(struct sata_phy *phy)
{
unsigned long flag;
struct sata_phy *x;
spin_lock_irqsave(&phy_lock, flag);
if (!phy)
return;
list_for_each_entry(x, &phy_list, head) {
if (x->type == phy->type)
list_del(&phy->head);
}
spin_unlock_irqrestore(&phy_lock, flag);
}
EXPORT_SYMBOL(sata_remove_phy);
void sata_put_phy(struct sata_phy *phy)
{
unsigned long flag;
spin_lock_irqsave(&phy_lock, flag);
if (!phy)
return;
put_device(phy->dev);
spin_unlock_irqrestore(&phy_lock, flag);
}
EXPORT_SYMBOL(sata_put_phy);
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