usb: dwc2: gadget: add vbus_session support

Enable phy driver to report vbus session. This allows us to remove
D+ pullup when vbus is not present.

Tested-by: Robert Baldyga <r.baldyga@samsung.com>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index e3bb525ae54d..65ec0f2dfab1 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3009,11 +3009,35 @@ static int s3c_hsotg_pullup(struct usb_gadget *gadget, int is_on)
         return 0;
 }
 
+static int s3c_hsotg_vbus_session(struct usb_gadget *gadget, int is_active)
+{
+        struct dwc2_hsotg *hsotg = to_hsotg(gadget);
+        unsigned long flags;
+
+        dev_dbg(hsotg->dev, "%s: is_active: %d\n", __func__, is_active);
+        spin_lock_irqsave(&hsotg->lock, flags);
+
+        if (is_active) {
+                /* Kill any ep0 requests as controller will be reinitialized */
+                kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET);
+                s3c_hsotg_core_init_disconnected(hsotg);
+                if (hsotg->enabled)
+                        s3c_hsotg_core_connect(hsotg);
+        } else {
+                s3c_hsotg_core_disconnect(hsotg);
+                s3c_hsotg_disconnect(hsotg);
+        }
+
+        spin_unlock_irqrestore(&hsotg->lock, flags);
+        return 0;
+}
+
 static const struct usb_gadget_ops s3c_hsotg_gadget_ops = {
         .get_frame      = s3c_hsotg_gadget_getframe,
         .udc_start              = s3c_hsotg_udc_start,
         .udc_stop               = s3c_hsotg_udc_stop,
         .pullup                 = s3c_hsotg_pullup,
+        .vbus_session           = s3c_hsotg_vbus_session,
 };
 
 /**