// 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 int usb_phy_roothub_add_phy(struct device *dev, int index,				   struct list_head *list){	struct usb_phy_roothub *roothub_entry;	struct phy *phy; 	phy = devm_of_phy_get_by_index(dev, dev->of_node, index);	if (IS_ERR(phy)) {		if (PTR_ERR(phy) == -ENODEV)			return 0;		else			return PTR_ERR(phy);	} 	roothub_entry = devm_kzalloc(dev, sizeof(*roothub_entry), GFP_KERNEL);	if (!roothub_entry)		return -ENOMEM; 	INIT_LIST_HEAD(&roothub_entry->list); 	roothub_entry->phy = phy; 	list_add_tail(&roothub_entry->list, list); 	return 0;} struct usb_phy_roothub *usb_phy_roothub_alloc(struct device *dev){	struct usb_phy_roothub *phy_roothub;	int i, num_phys, err; 	if (!IS_ENABLED(CONFIG_GENERIC_PHY))		return NULL; 	num_phys = of_count_phandle_with_args(dev->of_node, "phys",					      "#phy-cells");	if (num_phys <= 0)		return NULL; 	phy_roothub = devm_kzalloc(dev, sizeof(*phy_roothub), GFP_KERNEL);	if (!phy_roothub)		return ERR_PTR(-ENOMEM); 	INIT_LIST_HEAD(&phy_roothub->list); 	for (i = 0; i < num_phys; i++) {		err = usb_phy_roothub_add_phy(dev, i, &phy_roothub->list);		if (err)			return ERR_PTR(err);	} 	return phy_roothub;}EXPORT_SYMBOL_GPL(usb_phy_roothub_alloc); int usb_phy_roothub_init(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_init(roothub_entry->phy);		if (err)			goto err_exit_phys;	} 	return 0; err_exit_phys:	list_for_each_entry_continue_reverse(roothub_entry, head, list)		phy_exit(roothub_entry->phy); 	return 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 = err;	} 	return ret;}EXPORT_SYMBOL_GPL(usb_phy_roothub_exit); int usb_phy_roothub_set_mode(struct usb_phy_roothub *phy_roothub,			     enum phy_mode mode){	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_set_mode(roothub_entry->phy, mode);		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_set_mode); int usb_phy_roothub_calibrate(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_calibrate(roothub_entry->phy);		if (err)			return err;	} 	return 0;}EXPORT_SYMBOL_GPL(usb_phy_roothub_calibrate); 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); int usb_phy_roothub_suspend(struct device *controller_dev,			    struct usb_phy_roothub *phy_roothub){	usb_phy_roothub_power_off(phy_roothub); 	/* keep the PHYs initialized so the device can wake up the system */	if (device_may_wakeup(controller_dev))		return 0; 	return usb_phy_roothub_exit(phy_roothub);}EXPORT_SYMBOL_GPL(usb_phy_roothub_suspend); int usb_phy_roothub_resume(struct device *controller_dev,			   struct usb_phy_roothub *phy_roothub){	int err; 	/* if the device can't wake up the system _exit was called */	if (!device_may_wakeup(controller_dev)) {		err = usb_phy_roothub_init(phy_roothub);		if (err)			return err;	} 	err = usb_phy_roothub_power_on(phy_roothub); 	/* undo _init if _power_on failed */	if (err && !device_may_wakeup(controller_dev))		usb_phy_roothub_exit(phy_roothub); 	return err;}EXPORT_SYMBOL_GPL(usb_phy_roothub_resume);