--- /dev/null
+/*
+ * 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");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff