linux-kernel - [PATCH 3/3] usb: gadget: configfs: Add a specific configFS reset callback

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Date:   Tue, 29 Dec 2020 15:03:31 -0800
From:   Wesley Cheng <wcheng@...eaurora.org>
To:     peter.chen@....com, balbi@...nel.org, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Wesley Cheng <wcheng@...eaurora.org>
Subject: [PATCH 3/3] 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@....com>
Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
---
 drivers/usb/gadget/configfs.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 56051bb97349..80ca7ff2fb97 100644
--- 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,
-- 
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