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/*

 * PL-2301/2302 USB host-to-host link cables

 * Copyright (C) 2000-2005 by David Brownell

 *

 * 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

// #define      DEBUG                   // error path messages, extra info

// #define      VERBOSE                 // more; success messages

#include <linux/module.h>

#include <linux/init.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/ethtool.h>

#include <linux/workqueue.h>

#include <linux/mii.h>

#include <linux/usb.h>

#include "usbnet.h"

/*

 * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com

 *

 * The protocol and handshaking used here should be bug-compatible

 * with the Linux 2.2 "plusb" driver, by Deti Fliegl.

 *

 * HEADS UP:  this handshaking isn't all that robust.  This driver

 * gets confused easily if you unplug one end of the cable then

 * try to connect it again; you'll need to restart both ends. The

 * "naplink" software (used by some PlayStation/2 deveopers) does

 * the handshaking much better!   Also, sometimes this hardware

 * seems to get wedged under load.  Prolific docs are weak, and

 * don't identify differences between PL2301 and PL2302, much less

 * anything to explain the different PL2302 versions observed.

 */

/*

 * Bits 0-4 can be used for software handshaking; they're set from

 * one end, cleared from the other, "read" with the interrupt byte.

 */

#define PL_S_EN         (1<<7)          /* (feature only) suspend enable */

/* reserved bit -- rx ready (6) ? */

#define PL_TX_READY     (1<<5)          /* (interrupt only) transmit ready */

#define PL_RESET_OUT    (1<<4)          /* reset output pipe */

#define PL_RESET_IN     (1<<3)          /* reset input pipe */

#define PL_TX_C         (1<<2)          /* transmission complete */

#define PL_TX_REQ       (1<<1)          /* transmission received */

#define PL_PEER_E       (1<<0)          /* peer exists */

static inline int

pl_vendor_req(struct usbnet *dev, u8 req, u8 val, u8 index)

{

        return usb_control_msg(dev->udev,

                usb_rcvctrlpipe(dev->udev, 0),

                req,

                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,

                val, index,

                NULL, 0,

                USB_CTRL_GET_TIMEOUT);

}

static inline int

pl_clear_QuickLink_features(struct usbnet *dev, int val)

{

        return pl_vendor_req(dev, 1, (u8) val, 0);

}

static inline int

pl_set_QuickLink_features(struct usbnet *dev, int val)

{

        return pl_vendor_req(dev, 3, (u8) val, 0);

}

static int pl_reset(struct usbnet *dev)

{

        /* some units seem to need this reset, others reject it utterly.

         * FIXME be more like "naplink" or windows drivers.

         */

        (void) pl_set_QuickLink_features(dev,

                PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E);

        return 0;

}

static const struct driver_info prolific_info = {

        .description =  "Prolific PL-2301/PL-2302",

        .flags =        FLAG_NO_SETINT,

                /* some PL-2302 versions seem to fail usb_set_interface() */

        .reset =        pl_reset,

};

/*-------------------------------------------------------------------------*/

/*

 * Proilific's name won't normally be on the cables, and

 * may not be on the device.

 */

static const struct usb_device_id       products [] = {

{

        USB_DEVICE(0x067b, 0x0000),     // PL-2301

        .driver_info =  (unsigned long) &prolific_info,

}, {

        USB_DEVICE(0x067b, 0x0001),     // PL-2302

        .driver_info =  (unsigned long) &prolific_info,

},

        { },            // END

};

MODULE_DEVICE_TABLE(usb, products);

static struct usb_driver plusb_driver = {

        .name =         "plusb",

        .id_table =     products,

        .probe =        usbnet_probe,

        .disconnect =   usbnet_disconnect,

        .suspend =      usbnet_suspend,

        .resume =       usbnet_resume,

};

static int __init plusb_init(void)

{

        return usb_register(&plusb_driver);

}

module_init(plusb_init);

static void __exit plusb_exit(void)

{

        usb_deregister(&plusb_driver);

}

module_exit(plusb_exit);

MODULE_AUTHOR("David Brownell");

MODULE_DESCRIPTION("Prolific PL-2301/2302 USB Host to Host Link Driver");

MODULE_LICENSE("GPL");