drivers/usb/storage/initializers.c

/* Special Initializers for certain USB Mass Storage devices
 *
 * $Id: initializers.c,v 1.2 2000/09/06 22:35:57 mdharm Exp $
 *
 * Current development and maintenance by:
 *   (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
 *
 * This driver is based on the 'USB Mass Storage Class' document. This
 * describes in detail the protocol used to communicate with such
 * devices.  Clearly, the designers had SCSI and ATAPI commands in
 * mind when they created this document.  The commands are all very
 * similar to commands in the SCSI-II and ATAPI specifications.
 *
 * It is important to note that in a number of cases this class
 * exhibits class-specific exemptions from the USB specification.
 * Notably the usage of NAK, STALL and ACK differs from the norm, in
 * that they are used to communicate wait, failed and OK on commands.
 *
 * Also, for certain devices, the interrupt endpoint is used to convey
 * status of a command.
 *
 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
 * information about this driver.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/sched.h>
#include <linux/errno.h>
#include "initializers.h"
#include "debug.h"

/* This places the Shuttle/SCM USB<->SCSI bridge devices in multi-target
 * mode */
int usb_stor_euscsi_init(struct us_data *us)
{
	unsigned char data = 0x1;
	int result;

	US_DEBUGP("Attempting to init eUSCSI bridge...\n");
	result = usb_control_msg(us->pusb_dev, us->send_ctrl_pipe,
			0x0C, USB_RECIP_INTERFACE | USB_TYPE_VENDOR,
			0x01, 0x0, &data, 0x1, 5*HZ);
	US_DEBUGP("-- result is %d\n", result);
	US_DEBUGP("-- data afterwards is %d\n", data);

	return 0;
}