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// SPDX-License-Identifier: GPL-2.0+
/*
* A wrapper for multiple PHYs which passes all phy_* function calls to
* multiple (actual) PHY devices. This is comes handy when initializing
* all PHYs on a HCD and to keep them all in the same state.
*
* Copyright (C) 2018 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
*/
#include <linux/device.h>
#include <linux/list.h>
#include <linux/phy/phy.h>
#include <linux/of.h>
#include "phy.h"
struct usb_phy_roothub {
struct phy *phy;
struct list_head list;
};
static struct usb_phy_roothub *usb_phy_roothub_alloc(struct device *dev)
{
struct usb_phy_roothub *roothub_entry;
roothub_entry = devm_kzalloc(dev, sizeof(*roothub_entry), GFP_KERNEL);
if (!roothub_entry)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&roothub_entry->list);
return roothub_entry;
}
static int usb_phy_roothub_add_phy(struct device *dev, int index,
struct list_head *list)
{
struct usb_phy_roothub *roothub_entry;
struct phy *phy = devm_of_phy_get_by_index(dev, dev->of_node, index);
if (IS_ERR_OR_NULL(phy)) {
if (!phy || PTR_ERR(phy) == -ENODEV)
return 0;
else
return PTR_ERR(phy);
}
roothub_entry = usb_phy_roothub_alloc(dev);
if (IS_ERR(roothub_entry))
return PTR_ERR(roothub_entry);
roothub_entry->phy = phy;
list_add_tail(&roothub_entry->list, list);
return 0;
}
struct usb_phy_roothub *usb_phy_roothub_init(struct device *dev)
{
struct usb_phy_roothub *phy_roothub;
struct usb_phy_roothub *roothub_entry;
struct list_head *head;
int i, num_phys, err;
num_phys = of_count_phandle_with_args(dev->of_node, "phys",
"#phy-cells");
if (num_phys <= 0)
return NULL;
phy_roothub = usb_phy_roothub_alloc(dev);
if (IS_ERR(phy_roothub))
return phy_roothub;
for (i = 0; i < num_phys; i++) {
err = usb_phy_roothub_add_phy(dev, i, &phy_roothub->list);
if (err)
goto err_out;
}
head = &phy_roothub->list;
list_for_each_entry(roothub_entry, head, list) {
err = phy_init(roothub_entry->phy);
if (err)
goto err_exit_phys;
}
return phy_roothub;
err_exit_phys:
list_for_each_entry_continue_reverse(roothub_entry, head, list)
phy_exit(roothub_entry->phy);
err_out:
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(usb_phy_roothub_init);
int usb_phy_roothub_exit(struct usb_phy_roothub *phy_roothub)
{
struct usb_phy_roothub *roothub_entry;
struct list_head *head;
int err, ret = 0;
if (!phy_roothub)
return 0;
head = &phy_roothub->list;
list_for_each_entry(roothub_entry, head, list) {
err = phy_exit(roothub_entry->phy);
if (err)
ret = ret;
}
return ret;
}
EXPORT_SYMBOL_GPL(usb_phy_roothub_exit);
int usb_phy_roothub_power_on(struct usb_phy_roothub *phy_roothub)
{
struct usb_phy_roothub *roothub_entry;
struct list_head *head;
int err;
if (!phy_roothub)
return 0;
head = &phy_roothub->list;
list_for_each_entry(roothub_entry, head, list) {
err = phy_power_on(roothub_entry->phy);
if (err)
goto err_out;
}
return 0;
err_out:
list_for_each_entry_continue_reverse(roothub_entry, head, list)
phy_power_off(roothub_entry->phy);
return err;
}
EXPORT_SYMBOL_GPL(usb_phy_roothub_power_on);
void usb_phy_roothub_power_off(struct usb_phy_roothub *phy_roothub)
{
struct usb_phy_roothub *roothub_entry;
if (!phy_roothub)
return;
list_for_each_entry_reverse(roothub_entry, &phy_roothub->list, list)
phy_power_off(roothub_entry->phy);
}
EXPORT_SYMBOL_GPL(usb_phy_roothub_power_off);
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