usb: gadget: configfs: Add a specific configFS reset callback

In order for configFS based USB gadgets to set the proper charge current
for bus reset scenarios, expose a separate reset callback to set the
current to 100mA based on the USB battery charging specification.

Reviewed-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
Link: https://lore.kernel.org/r/1609283011-21997-4-git-send-email-wcheng@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 56051bb..80ca7ff 100644 (file)
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -1481,6 +1481,28 @@ static void configfs_composite_disconnect(struct usb_gadget *gadget)
        spin_unlock_irqrestore(&gi->spinlock, flags);
 }
 
+static void configfs_composite_reset(struct usb_gadget *gadget)
+{
+       struct usb_composite_dev *cdev;
+       struct gadget_info *gi;
+       unsigned long flags;
+
+       cdev = get_gadget_data(gadget);
+       if (!cdev)
+               return;
+
+       gi = container_of(cdev, struct gadget_info, cdev);
+       spin_lock_irqsave(&gi->spinlock, flags);
+       cdev = get_gadget_data(gadget);
+       if (!cdev || gi->unbind) {
+               spin_unlock_irqrestore(&gi->spinlock, flags);
+               return;
+       }
+
+       composite_reset(gadget);
+       spin_unlock_irqrestore(&gi->spinlock, flags);
+}
+
 static void configfs_composite_suspend(struct usb_gadget *gadget)
 {
        struct usb_composite_dev *cdev;
@@ -1530,7 +1552,7 @@ static const struct usb_gadget_driver configfs_driver_template = {
        .unbind         = configfs_composite_unbind,
 
        .setup          = configfs_composite_setup,
-       .reset          = configfs_composite_disconnect,
+       .reset          = configfs_composite_reset,
        .disconnect     = configfs_composite_disconnect,
 
        .suspend        = configfs_composite_suspend,