usb: phy: Introduce one extcon device into usb phy

Usually usb phy need register one extcon device to get the connection
notifications. It will remove some duplicate code if the extcon device
is registered using common code instead of each phy driver having its
own related extcon APIs. So we add one pointer of extcon device into
usb phy structure, and some other helper functions to register extcon.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/usb/phy/phy.c b/drivers/usb/phy/phy.c
index 98f75d2842b7..032f5afaad4b 100644
--- a/drivers/usb/phy/phy.c
+++ b/drivers/usb/phy/phy.c
@@ -100,6 +100,54 @@ static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
         return *phy == match_data;
 }
 
+static int usb_add_extcon(struct usb_phy *x)
+{
+        int ret;
+
+        if (of_property_read_bool(x->dev->of_node, "extcon")) {
+                x->edev = extcon_get_edev_by_phandle(x->dev, 0);
+                if (IS_ERR(x->edev))
+                        return PTR_ERR(x->edev);
+
+                x->id_edev = extcon_get_edev_by_phandle(x->dev, 1);
+                if (IS_ERR(x->id_edev)) {
+                        x->id_edev = NULL;
+                        dev_info(x->dev, "No separate ID extcon device\n");
+                }
+
+                if (x->vbus_nb.notifier_call) {
+                        ret = devm_extcon_register_notifier(x->dev, x->edev,
+                                                            EXTCON_USB,
+                                                            &x->vbus_nb);
+                        if (ret < 0) {
+                                dev_err(x->dev,
+                                        "register VBUS notifier failed\n");
+                                return ret;
+                        }
+                }
+
+                if (x->id_nb.notifier_call) {
+                        struct extcon_dev *id_ext;
+
+                        if (x->id_edev)
+                                id_ext = x->id_edev;
+                        else
+                                id_ext = x->edev;
+
+                        ret = devm_extcon_register_notifier(x->dev, id_ext,
+                                                            EXTCON_USB_HOST,
+                                                            &x->id_nb);
+                        if (ret < 0) {
+                                dev_err(x->dev,
+                                        "register ID notifier failed\n");
+                                return ret;
+                        }
+                }
+        }
+
+        return 0;
+}
+
 /**
  * devm_usb_get_phy - find the USB PHY
  * @dev - device that requests this phy
@@ -388,6 +436,10 @@ int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
                 return -EINVAL;
         }
 
+        ret = usb_add_extcon(x);
+        if (ret)
+                return ret;
+
         ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
 
         spin_lock_irqsave(&phy_lock, flags);
@@ -422,12 +474,17 @@ int usb_add_phy_dev(struct usb_phy *x)
 {
         struct usb_phy_bind *phy_bind;
         unsigned long flags;
+        int ret;
 
         if (!x->dev) {
                 dev_err(x->dev, "no device provided for PHY\n");
                 return -EINVAL;
         }
 
+        ret = usb_add_extcon(x);
+        if (ret)
+                return ret;
+
         ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
 
         spin_lock_irqsave(&phy_lock, flags);