[PATCH 02/14] usb: phy: Add new API usb_get_phy_from_dev()

[Roger Quadros <rogerq@xxxxxx>]

This API allows PHY users to get the usb_phy data structure
from a device handle.

Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
 drivers/usb/otg/otg.c   |   36 ++++++++++++++++++++++++++++++++++++
 include/linux/usb/phy.h |    6 ++++++
 2 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
index a30c041..ba3a568 100644
--- a/drivers/usb/otg/otg.c
+++ b/drivers/usb/otg/otg.c
@@ -35,6 +35,21 @@ static struct usb_phy *__usb_find_phy(struct list_head *list,
 	return ERR_PTR(-ENODEV);
 }
 
+static struct usb_phy *__usb_find_phy_dev(struct list_head *list,
+	struct device *dev)
+{
+	struct usb_phy *phy;
+
+	list_for_each_entry(phy, list, head) {
+		if (phy->dev != dev)
+			continue;
+
+		return phy;
+	}
+
+	return ERR_PTR(-ENODEV);
+}
+
 static void devm_usb_phy_release(struct device *dev, void *res)
 {
 	struct usb_phy *phy = *(struct usb_phy **)res;
@@ -77,6 +92,27 @@ struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
 }
 EXPORT_SYMBOL(devm_usb_get_phy);
 
+struct usb_phy *usb_get_phy_from_dev(struct device *dev)
+{
+	struct usb_phy *phy = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&phy_lock, flags);
+
+	phy = __usb_find_phy_dev(&phy_list, dev);
+	if (IS_ERR(phy)) {
+		dev_err(dev, "%s: unable to find PHY\n", __func__);
+		goto done;
+	}
+
+	get_device(phy->dev);
+
+done:
+	spin_unlock_irqrestore(&phy_lock, flags);
+	return phy;
+}
+EXPORT_SYMBOL(usb_get_phy_from_dev);
+
 /**
  * usb_get_phy - find the USB PHY
  * @type - the type of the phy the controller requires
diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
index a29ae1e..cd798c4 100644
--- a/include/linux/usb/phy.h
+++ b/include/linux/usb/phy.h
@@ -147,6 +147,7 @@ usb_phy_shutdown(struct usb_phy *x)
 /* for usb host and peripheral controller drivers */
 #ifdef CONFIG_USB_OTG_UTILS
 extern struct usb_phy *usb_get_phy(enum usb_phy_type type);
+extern struct usb_phy *usb_get_phy_from_dev(struct device *dev);
 extern struct usb_phy *devm_usb_get_phy(struct device *dev,
 	enum usb_phy_type type);
 extern void usb_put_phy(struct usb_phy *);
@@ -157,6 +158,11 @@ static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
 	return NULL;
 }
 
+static inline struct usb_phy *usb_get_phy_from_dev(struct device *dev)
+{
+	return NULL;
+}
+
 static inline struct usb_phy *devm_usb_get_phy(struct device *dev,
 	enum usb_phy_type type)
 {
-- 
1.7.4.1

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