usb: gadget: hsotg: pullup method implementation for s3c-hsotg UDC driver

This commit adds pullup method implementation for UDC s3c-hsotg driver.
It is needed for e.g. CCG - Configurable Composite Gadget, when user space
configuration change request device disconnection from USB bus (done via
calling usb_gadget_connect/disconnect, which calls UDC's pullup method).

Implementation of pullup method has caused removal of phy_enable and
core_init methods from udc_start to pullup.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 30 insertions, 3 deletions

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index d208c46341d7..75a28e6d3761 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -2963,9 +2963,6 @@ static int s3c_hsotg_udc_start(struct usb_gadget *gadget,
                 goto err;
         }
 
-        s3c_hsotg_phy_enable(hsotg);
-
-        s3c_hsotg_core_init(hsotg);
         hsotg->last_rst = jiffies;
         dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name);
         return 0;
@@ -3028,10 +3025,40 @@ static int s3c_hsotg_gadget_getframe(struct usb_gadget *gadget)
         return s3c_hsotg_read_frameno(to_hsotg(gadget));
 }
 
+/**
+ * s3c_hsotg_pullup - connect/disconnect the USB PHY
+ * @gadget: The usb gadget state
+ * @is_on: Current state of the USB PHY
+ *
+ * Connect/Disconnect the USB PHY pullup
+ */
+static int s3c_hsotg_pullup(struct usb_gadget *gadget, int is_on)
+{
+        struct s3c_hsotg *hsotg = to_hsotg(gadget);
+        unsigned long flags = 0;
+
+        dev_dbg(hsotg->dev, "%s: is_in: %d\n", __func__, is_on);
+
+        spin_lock_irqsave(&hsotg->lock, flags);
+        if (is_on) {
+                s3c_hsotg_phy_enable(hsotg);
+                s3c_hsotg_core_init(hsotg);
+        } else {
+                s3c_hsotg_disconnect(hsotg);
+                s3c_hsotg_phy_disable(hsotg);
+        }
+
+        hsotg->gadget.speed = USB_SPEED_UNKNOWN;
+        spin_unlock_irqrestore(&hsotg->lock, flags);
+
+        return 0;
+}
+
 static 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,
 };
 
 /**