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linux
/
drivers
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usb
/
core
/
phy.c
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158 lines (121 loc) · 3.36 KB
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linux
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drivers
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usb
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core
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phy.c
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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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