444 lines
11 KiB
C
444 lines
11 KiB
C
/*
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* phy.c -- USB phy handling
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*
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* Copyright (C) 2004-2013 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/usb/phy.h>
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static LIST_HEAD(phy_list);
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static LIST_HEAD(phy_bind_list);
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static DEFINE_SPINLOCK(phy_lock);
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static struct usb_phy *__usb_find_phy(struct list_head *list,
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enum usb_phy_type type)
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{
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struct usb_phy *phy = NULL;
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list_for_each_entry(phy, list, head) {
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if (phy->type != type)
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continue;
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return phy;
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}
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return ERR_PTR(-ENODEV);
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}
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static struct usb_phy *__usb_find_phy_dev(struct device *dev,
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struct list_head *list, u8 index)
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{
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struct usb_phy_bind *phy_bind = NULL;
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list_for_each_entry(phy_bind, list, list) {
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if (!(strcmp(phy_bind->dev_name, dev_name(dev))) &&
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phy_bind->index == index) {
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if (phy_bind->phy)
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return phy_bind->phy;
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else
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return ERR_PTR(-EPROBE_DEFER);
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}
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}
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return ERR_PTR(-ENODEV);
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}
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static struct usb_phy *__of_usb_find_phy(struct device_node *node)
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{
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struct usb_phy *phy;
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list_for_each_entry(phy, &phy_list, head) {
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if (node != phy->dev->of_node)
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continue;
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return phy;
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}
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return ERR_PTR(-ENODEV);
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}
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static void devm_usb_phy_release(struct device *dev, void *res)
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{
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struct usb_phy *phy = *(struct usb_phy **)res;
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usb_put_phy(phy);
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}
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static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
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{
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return res == match_data;
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}
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/**
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* devm_usb_get_phy - find the USB PHY
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* @dev - device that requests this phy
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* @type - the type of the phy the controller requires
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*
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* Gets the phy using usb_get_phy(), and associates a device with it using
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* devres. On driver detach, release function is invoked on the devres data,
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* then, devres data is freed.
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*
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* For use by USB host and peripheral drivers.
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*/
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struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
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{
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struct usb_phy **ptr, *phy;
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ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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phy = usb_get_phy(type);
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if (!IS_ERR(phy)) {
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*ptr = phy;
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devres_add(dev, ptr);
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} else
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devres_free(ptr);
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return phy;
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}
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EXPORT_SYMBOL_GPL(devm_usb_get_phy);
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/**
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* usb_get_phy - find the USB PHY
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* @type - the type of the phy the controller requires
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*
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* Returns the phy driver, after getting a refcount to it; or
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* -ENODEV if there is no such phy. The caller is responsible for
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* calling usb_put_phy() to release that count.
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*
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* For use by USB host and peripheral drivers.
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*/
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struct usb_phy *usb_get_phy(enum usb_phy_type type)
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{
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struct usb_phy *phy = NULL;
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unsigned long flags;
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spin_lock_irqsave(&phy_lock, flags);
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phy = __usb_find_phy(&phy_list, type);
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if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
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pr_debug("PHY: unable to find transceiver of type %s\n",
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usb_phy_type_string(type));
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if (!IS_ERR(phy))
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phy = ERR_PTR(-ENODEV);
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goto err0;
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}
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get_device(phy->dev);
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err0:
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spin_unlock_irqrestore(&phy_lock, flags);
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return phy;
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}
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EXPORT_SYMBOL_GPL(usb_get_phy);
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/**
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* devm_usb_get_phy_by_phandle - find the USB PHY by phandle
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* @dev - device that requests this phy
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* @phandle - name of the property holding the phy phandle value
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* @index - the index of the phy
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*
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* Returns the phy driver associated with the given phandle value,
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* after getting a refcount to it, -ENODEV if there is no such phy or
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* -EPROBE_DEFER if there is a phandle to the phy, but the device is
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* not yet loaded. While at that, it also associates the device with
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* the phy using devres. On driver detach, release function is invoked
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* on the devres data, then, devres data is freed.
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*
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* For use by USB host and peripheral drivers.
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*/
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struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
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const char *phandle, u8 index)
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{
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struct usb_phy *phy = ERR_PTR(-ENOMEM), **ptr;
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unsigned long flags;
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struct device_node *node;
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if (!dev->of_node) {
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dev_dbg(dev, "device does not have a device node entry\n");
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return ERR_PTR(-EINVAL);
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}
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node = of_parse_phandle(dev->of_node, phandle, index);
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if (!node) {
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dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
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dev->of_node->full_name);
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return ERR_PTR(-ENODEV);
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}
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ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr) {
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dev_dbg(dev, "failed to allocate memory for devres\n");
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goto err0;
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}
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spin_lock_irqsave(&phy_lock, flags);
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phy = __of_usb_find_phy(node);
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if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
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phy = ERR_PTR(-EPROBE_DEFER);
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devres_free(ptr);
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goto err1;
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}
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*ptr = phy;
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devres_add(dev, ptr);
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get_device(phy->dev);
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err1:
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spin_unlock_irqrestore(&phy_lock, flags);
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err0:
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of_node_put(node);
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return phy;
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}
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EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
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/**
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* usb_get_phy_dev - find the USB PHY
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* @dev - device that requests this phy
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* @index - the index of the phy
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*
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* Returns the phy driver, after getting a refcount to it; or
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* -ENODEV if there is no such phy. The caller is responsible for
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* calling usb_put_phy() to release that count.
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*
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* For use by USB host and peripheral drivers.
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*/
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struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
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{
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struct usb_phy *phy = NULL;
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unsigned long flags;
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spin_lock_irqsave(&phy_lock, flags);
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phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
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if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
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dev_dbg(dev, "unable to find transceiver\n");
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goto err0;
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}
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get_device(phy->dev);
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err0:
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spin_unlock_irqrestore(&phy_lock, flags);
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return phy;
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}
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EXPORT_SYMBOL_GPL(usb_get_phy_dev);
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/**
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* devm_usb_get_phy_dev - find the USB PHY using device ptr and index
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* @dev - device that requests this phy
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* @index - the index of the phy
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*
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* Gets the phy using usb_get_phy_dev(), and associates a device with it using
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* devres. On driver detach, release function is invoked on the devres data,
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* then, devres data is freed.
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*
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* For use by USB host and peripheral drivers.
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*/
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struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
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{
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struct usb_phy **ptr, *phy;
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ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return NULL;
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phy = usb_get_phy_dev(dev, index);
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if (!IS_ERR(phy)) {
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*ptr = phy;
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devres_add(dev, ptr);
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} else
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devres_free(ptr);
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return phy;
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}
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EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);
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/**
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* devm_usb_put_phy - release the USB PHY
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* @dev - device that wants to release this phy
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* @phy - the phy returned by devm_usb_get_phy()
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*
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* destroys the devres associated with this phy and invokes usb_put_phy
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* to release the phy.
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*
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* For use by USB host and peripheral drivers.
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*/
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void devm_usb_put_phy(struct device *dev, struct usb_phy *phy)
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{
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int r;
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r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
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dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
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}
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EXPORT_SYMBOL_GPL(devm_usb_put_phy);
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/**
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* usb_put_phy - release the USB PHY
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* @x: the phy returned by usb_get_phy()
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*
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* Releases a refcount the caller received from usb_get_phy().
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*
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* For use by USB host and peripheral drivers.
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*/
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void usb_put_phy(struct usb_phy *x)
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{
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if (x) {
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struct module *owner = x->dev->driver->owner;
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put_device(x->dev);
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module_put(owner);
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}
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}
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EXPORT_SYMBOL_GPL(usb_put_phy);
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/**
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* usb_add_phy - declare the USB PHY
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* @x: the USB phy to be used; or NULL
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* @type - the type of this PHY
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*
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* This call is exclusively for use by phy drivers, which
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* coordinate the activities of drivers for host and peripheral
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* controllers, and in some cases for VBUS current regulation.
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*/
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int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
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{
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int ret = 0;
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unsigned long flags;
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struct usb_phy *phy;
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if (x->type != USB_PHY_TYPE_UNDEFINED) {
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dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
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return -EINVAL;
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}
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ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
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spin_lock_irqsave(&phy_lock, flags);
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list_for_each_entry(phy, &phy_list, head) {
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if (phy->type == type) {
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ret = -EBUSY;
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dev_err(x->dev, "transceiver type %s already exists\n",
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usb_phy_type_string(type));
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goto out;
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}
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}
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x->type = type;
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list_add_tail(&x->head, &phy_list);
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out:
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spin_unlock_irqrestore(&phy_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_add_phy);
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/**
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* usb_add_phy_dev - declare the USB PHY
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* @x: the USB phy to be used; or NULL
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*
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* This call is exclusively for use by phy drivers, which
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* coordinate the activities of drivers for host and peripheral
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* controllers, and in some cases for VBUS current regulation.
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*/
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int usb_add_phy_dev(struct usb_phy *x)
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{
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struct usb_phy_bind *phy_bind;
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unsigned long flags;
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if (!x->dev) {
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dev_err(x->dev, "no device provided for PHY\n");
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return -EINVAL;
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}
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ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
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spin_lock_irqsave(&phy_lock, flags);
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list_for_each_entry(phy_bind, &phy_bind_list, list)
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if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev))))
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phy_bind->phy = x;
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list_add_tail(&x->head, &phy_list);
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spin_unlock_irqrestore(&phy_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL_GPL(usb_add_phy_dev);
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/**
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* usb_remove_phy - remove the OTG PHY
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* @x: the USB OTG PHY to be removed;
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*
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* This reverts the effects of usb_add_phy
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*/
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void usb_remove_phy(struct usb_phy *x)
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{
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unsigned long flags;
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struct usb_phy_bind *phy_bind;
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spin_lock_irqsave(&phy_lock, flags);
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if (x) {
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list_for_each_entry(phy_bind, &phy_bind_list, list)
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if (phy_bind->phy == x)
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phy_bind->phy = NULL;
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list_del(&x->head);
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}
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spin_unlock_irqrestore(&phy_lock, flags);
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}
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EXPORT_SYMBOL_GPL(usb_remove_phy);
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/**
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* usb_bind_phy - bind the phy and the controller that uses the phy
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* @dev_name: the device name of the device that will bind to the phy
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* @index: index to specify the port number
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* @phy_dev_name: the device name of the phy
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*
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* Fills the phy_bind structure with the dev_name and phy_dev_name. This will
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* be used when the phy driver registers the phy and when the controller
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* requests this phy.
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*
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* To be used by platform specific initialization code.
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*/
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int usb_bind_phy(const char *dev_name, u8 index,
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const char *phy_dev_name)
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{
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struct usb_phy_bind *phy_bind;
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unsigned long flags;
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phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
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if (!phy_bind)
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return -ENOMEM;
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phy_bind->dev_name = dev_name;
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phy_bind->phy_dev_name = phy_dev_name;
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phy_bind->index = index;
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spin_lock_irqsave(&phy_lock, flags);
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list_add_tail(&phy_bind->list, &phy_bind_list);
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spin_unlock_irqrestore(&phy_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL_GPL(usb_bind_phy);
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