1 files changed, 122 insertions, 0 deletions
diff --git a/pl2501.c b/pl2501.c
new file mode 100644
index 000000000000..137d0626621c
--- /dev/null
+++ b/pl2501.c
@@ -0,0 +1,122 @@
+/*
+ * 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");