From mboxrd@z Thu Jan  1 00:00:00 1970
From: dave.jing.tian@gmail.com (Dave Tian)
Date: Sat, 28 Jun 2014 19:33:07 -0700
Subject: usb mass storage ADSC cmd
Message-ID: <4ED79FC9-66AD-4909-B128-3E46A0BDDF5A@gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi there,

I am trying to implement a communication between the host and a usb mass storage device using ADSC cmd. The device is using the g_mass_storage gadget driver. So far, broken pipe (-32) from the host side is all what I have got. My questions are:

1. Could the device support ADSC cmd even it is using SCSI transport instead of CBI transport?
2. Is this composite correct for the host to retrieve 1 byte response from the device using ADSC?
usb_control_msg(udev,
	usb_rcvctrlpipe(udev, 0),
	0,	// ADSC
	USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, // type
	0,	// value
	0,	// index
	buf,	// recv buf
	1,	// size
	10*HZ);	// timeout

Thanks,

Dave Tian
dave.jing.tian at gmail.com