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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, -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
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