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/*
* PL-2501 USB host-to-host link cables
* Copyright (C) 2000-2005 by David Brownell
* Copyright (C) 2012 by others
*
* 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
*/
#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 <linux/usb/usbnet.h>
/*
* 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 PL2501_S_EN (1<<7) /* (feature only) suspend enable */
/* reserved bit -- rx ready (6) ? */
#define PL2501_TX_READY (1<<5) /* (interrupt only) transmit ready */
#define PL2501_RESET_OUT (1<<4) /* reset output pipe */
#define PL2501_RESET_IN (1<<3) /* reset input pipe */
#define PL2501_TX_C (1<<2) /* transmission complete */
#define PL2501_TX_REQ (1<<1) /* transmission received */
#define PL2501_PEER_E (1<<0) /* peer exists */
static inline int
pl2501_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
pl2501_clear_QuickLink_features(struct usbnet *dev, int val)
{
return pl2501_vendor_req(dev, 1, (u8) val, 0);
}
static inline int
pl2501_set_QuickLink_features(struct usbnet *dev, int val)
{
return pl2501_vendor_req(dev, 3, (u8) val, 0);
}
static int pl2501_reset(struct usbnet *dev)
{
int status;
/* some units seem to need this reset, others reject it utterly.
* FIXME be more like "naplink" or windows drivers.
*/
status = pl2501_set_QuickLink_features(dev,
PL2501_S_EN|PL2501_RESET_OUT|PL2501_RESET_IN|PL2501_PEER_E);
if (status != 0 && netif_msg_probe(dev))
netif_dbg(dev, link, dev->net, "pl2501_reset --> %d\n", status);
return 0;
}
static const struct driver_info prolific_info = {
.description = "Prolific PL-2501",
.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT,
/* some PL-2302 versions seem to fail usb_set_interface() */
.reset = pl2501_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, 0x2501), /* (PL-2501) */
.driver_info = (unsigned long) &prolific_info,
},
{ }, // END
};
MODULE_DEVICE_TABLE(usb, products);
static struct usb_driver pl2501_driver = {
.name = "pl2501",
.id_table = products,
.probe = usbnet_probe,
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.disable_hub_initiated_lpm = 1,
};
module_usb_driver(pl2501_driver);
MODULE_AUTHOR("David Brownell and others");
MODULE_DESCRIPTION("Prolific PL-2501 USB Host to Host Link Driver");
MODULE_LICENSE("GPL");
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