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