Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1214 insertions, 0 deletions

diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
new file mode 100644
index 00000000000..bba22e97ea0
--- /dev/null
+++ b/drivers/usb/class/usblp.c
@@ -0,0 +1,1214 @@
+/*
+ * usblp.c  Version 0.13
+ *
+ * Copyright (c) 1999 Michael Gee	<michael@linuxspecific.com>
+ * Copyright (c) 1999 Pavel Machek	<pavel@suse.cz>
+ * Copyright (c) 2000 Randy Dunlap	<rddunlap@osdl.org>
+ * Copyright (c) 2000 Vojtech Pavlik	<vojtech@suse.cz>
+ # Copyright (c) 2001 Pete Zaitcev	<zaitcev@redhat.com>
+ # Copyright (c) 2001 David Paschal	<paschal@rcsis.com>
+ *
+ * USB Printer Device Class driver for USB printers and printer cables
+ *
+ * Sponsored by SuSE
+ *
+ * ChangeLog:
+ *	v0.1 - thorough cleaning, URBification, almost a rewrite
+ *	v0.2 - some more cleanups
+ *	v0.3 - cleaner again, waitqueue fixes
+ *	v0.4 - fixes in unidirectional mode
+ *	v0.5 - add DEVICE_ID string support
+ *	v0.6 - never time out
+ *	v0.7 - fixed bulk-IN read and poll (David Paschal)
+ *	v0.8 - add devfs support
+ *	v0.9 - fix unplug-while-open paths
+ *	v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
+ *	v0.11 - add proto_bias option (Pete Zaitcev)
+ *	v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
+ *	v0.13 - alloc space for statusbuf (<status> not on stack);
+ *		use usb_buffer_alloc() for read buf & write buf;
+ */
+
+/*
+ * 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/kernel.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/signal.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/lp.h>
+#undef DEBUG
+#include <linux/usb.h>
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v0.13"
+#define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
+#define DRIVER_DESC "USB Printer Device Class driver"
+
+#define USBLP_BUF_SIZE		8192
+#define USBLP_DEVICE_ID_SIZE	1024
+
+/* ioctls: */
+#define LPGETSTATUS		0x060b		/* same as in drivers/char/lp.c */
+#define IOCNR_GET_DEVICE_ID		1
+#define IOCNR_GET_PROTOCOLS		2
+#define IOCNR_SET_PROTOCOL		3
+#define IOCNR_HP_SET_CHANNEL		4
+#define IOCNR_GET_BUS_ADDRESS		5
+#define IOCNR_GET_VID_PID		6
+#define IOCNR_SOFT_RESET		7
+/* Get device_id string: */
+#define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
+/* The following ioctls were added for http://hpoj.sourceforge.net: */
+/* Get two-int array:
+ * [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
+ * [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
+#define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
+/* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
+#define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
+/* Set channel number (HP Vendor-specific command): */
+#define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
+/* Get two-int array: [0]=bus number, [1]=device address: */
+#define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
+/* Get two-int array: [0]=vendor ID, [1]=product ID: */
+#define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
+/* Perform class specific soft reset */
+#define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
+
+/*
+ * A DEVICE_ID string may include the printer's serial number.
+ * It should end with a semi-colon (';').
+ * An example from an HP 970C DeskJet printer is (this is one long string,
+ * with the serial number changed):
+MFG:HEWLETT-PACKARD;MDL:DESKJET 970C;CMD:MLC,PCL,PML;CLASS:PRINTER;DESCRIPTION:Hewlett-Packard DeskJet 970C;SERN:US970CSEPROF;VSTATUS:$HB0$NC0,ff,DN,IDLE,CUT,K1,C0,DP,NR,KP000,CP027;VP:0800,FL,B0;VJ:                    ;
+ */
+
+/*
+ * USB Printer Requests
+ */
+
+#define USBLP_REQ_GET_ID			0x00
+#define USBLP_REQ_GET_STATUS			0x01
+#define USBLP_REQ_RESET				0x02
+#define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST	0x00	/* HP Vendor-specific */
+
+#define USBLP_MINORS		16
+#define USBLP_MINOR_BASE	0
+
+#define USBLP_WRITE_TIMEOUT	(5000)			/* 5 seconds */
+
+#define USBLP_FIRST_PROTOCOL	1
+#define USBLP_LAST_PROTOCOL	3
+#define USBLP_MAX_PROTOCOLS	(USBLP_LAST_PROTOCOL+1)
+
+/*
+ * some arbitrary status buffer size;
+ * need a status buffer that is allocated via kmalloc(), not on stack
+ */
+#define STATUS_BUF_SIZE		8
+
+struct usblp {
+	struct usb_device 	*dev;			/* USB device */
+	struct semaphore	sem;			/* locks this struct, especially "dev" */
+	char			*writebuf;		/* write transfer_buffer */
+	char			*readbuf;		/* read transfer_buffer */
+	char			*statusbuf;		/* status transfer_buffer */
+	struct urb		*readurb, *writeurb;	/* The urbs */
+	wait_queue_head_t	wait;			/* Zzzzz ... */
+	int			readcount;		/* Counter for reads */
+	int			ifnum;			/* Interface number */
+	struct usb_interface	*intf;			/* The interface */
+	/* Alternate-setting numbers and endpoints for each protocol
+	 * (7/1/{index=1,2,3}) that the device supports: */
+	struct {
+		int				alt_setting;
+		struct usb_endpoint_descriptor	*epwrite;
+		struct usb_endpoint_descriptor	*epread;
+	}			protocol[USBLP_MAX_PROTOCOLS];
+	int			current_protocol;
+	int			minor;			/* minor number of device */
+	int			wcomplete;		/* writing is completed */
+	int			rcomplete;		/* reading is completed */
+	unsigned int		quirks;			/* quirks flags */
+	unsigned char		used;			/* True if open */
+	unsigned char		present;		/* True if not disconnected */
+	unsigned char		bidir;			/* interface is bidirectional */
+	unsigned char		*device_id_string;	/* IEEE 1284 DEVICE ID string (ptr) */
+							/* first 2 bytes are (big-endian) length */
+};
+
+#ifdef DEBUG
+static void usblp_dump(struct usblp *usblp) {
+	int p;
+
+	dbg("usblp=0x%p", usblp);
+	dbg("dev=0x%p", usblp->dev);
+	dbg("present=%d", usblp->present);
+	dbg("readbuf=0x%p", usblp->readbuf);
+	dbg("writebuf=0x%p", usblp->writebuf);
+	dbg("readurb=0x%p", usblp->readurb);
+	dbg("writeurb=0x%p", usblp->writeurb);
+	dbg("readcount=%d", usblp->readcount);
+	dbg("ifnum=%d", usblp->ifnum);
+    for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
+	dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
+	dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
+	dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
+    }
+	dbg("current_protocol=%d", usblp->current_protocol);
+	dbg("minor=%d", usblp->minor);
+	dbg("wcomplete=%d", usblp->wcomplete);
+	dbg("rcomplete=%d", usblp->rcomplete);
+	dbg("quirks=%d", usblp->quirks);
+	dbg("used=%d", usblp->used);
+	dbg("bidir=%d", usblp->bidir);
+	dbg("device_id_string=\"%s\"",
+		usblp->device_id_string ?
+			usblp->device_id_string + 2 :
+			(unsigned char *)"(null)");
+}
+#endif
+
+/* Quirks: various printer quirks are handled by this table & its flags. */
+
+struct quirk_printer_struct {
+	__u16 vendorId;
+	__u16 productId;
+	unsigned int quirks;
+};
+
+#define USBLP_QUIRK_BIDIR	0x1	/* reports bidir but requires unidirectional mode (no INs/reads) */
+#define USBLP_QUIRK_USB_INIT	0x2	/* needs vendor USB init string */
+
+static struct quirk_printer_struct quirk_printers[] = {
+	{ 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
+	{ 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
+	{ 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
+	{ 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
+	{ 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
+	{ 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
+	{ 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */   
+	{ 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */   
+	{ 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
+	{ 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
+	{ 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
+	{ 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
+	{ 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
+	{ 0, 0 }
+};
+
+static int usblp_select_alts(struct usblp *usblp);
+static int usblp_set_protocol(struct usblp *usblp, int protocol);
+static int usblp_cache_device_id_string(struct usblp *usblp);
+
+/* forward reference to make our lives easier */
+static struct usb_driver usblp_driver;
+static DECLARE_MUTEX(usblp_sem);	/* locks the existence of usblp's */
+
+/*
+ * Functions for usblp control messages.
+ */
+
+static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
+{
+	int retval;
+	int index = usblp->ifnum;
+
+	/* High byte has the interface index.
+	   Low byte has the alternate setting.
+	 */
+	if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
+	  index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
+	}
+
+	retval = usb_control_msg(usblp->dev,
+		dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
+		request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
+	dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
+		request, !!dir, recip, value, index, len, retval);
+	return retval < 0 ? retval : 0;
+}
+
+#define usblp_read_status(usblp, status)\
+	usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
+#define usblp_get_id(usblp, config, id, maxlen)\
+	usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
+#define usblp_reset(usblp)\
+	usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
+
+#define usblp_hp_channel_change_request(usblp, channel, buffer) \
+	usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
+
+/*
+ * See the description for usblp_select_alts() below for the usage
+ * explanation.  Look into your /proc/bus/usb/devices and dmesg in
+ * case of any trouble.
+ */
+static int proto_bias = -1;
+
+/*
+ * URB callback.
+ */
+
+static void usblp_bulk_read(struct urb *urb, struct pt_regs *regs)
+{
+	struct usblp *usblp = urb->context;
+
+	if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
+		return;
+
+	if (unlikely(urb->status))
+		warn("usblp%d: nonzero read/write bulk status received: %d",
+			usblp->minor, urb->status);
+	usblp->rcomplete = 1;
+	wake_up_interruptible(&usblp->wait);
+}
+
+static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
+{
+	struct usblp *usblp = urb->context;
+
+	if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
+		return;
+
+	if (unlikely(urb->status))
+		warn("usblp%d: nonzero read/write bulk status received: %d",
+			usblp->minor, urb->status);
+	usblp->wcomplete = 1;
+	wake_up_interruptible(&usblp->wait);
+}
+
+/*
+ * Get and print printer errors.
+ */
+
+static char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
+
+static int usblp_check_status(struct usblp *usblp, int err)
+{
+	unsigned char status, newerr = 0;
+	int error;
+
+	error = usblp_read_status (usblp, usblp->statusbuf);
+	if (error < 0) {
+		err("usblp%d: error %d reading printer status",
+			usblp->minor, error);
+		return 0;
+	}
+
+	status = *usblp->statusbuf;
+
+	if (~status & LP_PERRORP)
+		newerr = 3;
+	if (status & LP_POUTPA)
+		newerr = 1;
+	if (~status & LP_PSELECD)
+		newerr = 2;
+
+	if (newerr != err)
+		info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
+
+	return newerr;
+}
+
+/*
+ * File op functions.
+ */
+
+static int usblp_open(struct inode *inode, struct file *file)
+{
+	int minor = iminor(inode);
+	struct usblp *usblp;
+	struct usb_interface *intf;
+	int retval;
+
+	if (minor < 0)
+		return -ENODEV;
+
+	down (&usblp_sem);
+
+	retval = -ENODEV;
+	intf = usb_find_interface(&usblp_driver, minor);
+	if (!intf) {
+		goto out;
+	}
+	usblp = usb_get_intfdata (intf);
+	if (!usblp || !usblp->dev || !usblp->present)
+		goto out;
+
+	retval = -EBUSY;
+	if (usblp->used)
+		goto out;
+
+	/*
+	 * TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
+	 * This is #if 0-ed because we *don't* want to fail an open
+	 * just because the printer is off-line.
+	 */
+#if 0
+	if ((retval = usblp_check_status(usblp, 0))) {
+		retval = retval > 1 ? -EIO : -ENOSPC;
+		goto out;
+	}
+#else
+	retval = 0;
+#endif
+
+	usblp->used = 1;
+	file->private_data = usblp;
+
+	usblp->writeurb->transfer_buffer_length = 0;
+	usblp->wcomplete = 1; /* we begin writeable */
+	usblp->rcomplete = 0;
+
+	if (usblp->bidir) {
+		usblp->readcount = 0;
+		usblp->readurb->dev = usblp->dev;
+		if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
+			retval = -EIO;
+			usblp->used = 0;
+			file->private_data = NULL;
+		}
+	}
+out:
+	up (&usblp_sem);
+	return retval;
+}
+
+static void usblp_cleanup (struct usblp *usblp)
+{
+	info("usblp%d: removed", usblp->minor);
+
+	kfree (usblp->device_id_string);
+	kfree (usblp->statusbuf);
+	usb_free_urb(usblp->writeurb);
+	usb_free_urb(usblp->readurb);
+	kfree (usblp);
+}
+
+static void usblp_unlink_urbs(struct usblp *usblp)
+{
+	usb_kill_urb(usblp->writeurb);
+	if (usblp->bidir)
+		usb_kill_urb(usblp->readurb);
+}
+
+static int usblp_release(struct inode *inode, struct file *file)
+{
+	struct usblp *usblp = file->private_data;
+
+	down (&usblp_sem);
+	usblp->used = 0;
+	if (usblp->present) {
+		usblp_unlink_urbs(usblp);
+	} else 		/* finish cleanup from disconnect */
+		usblp_cleanup (usblp);
+	up (&usblp_sem);
+	return 0;
+}
+
+/* No kernel lock - fine */
+static unsigned int usblp_poll(struct file *file, struct poll_table_struct *wait)
+{
+	struct usblp *usblp = file->private_data;
+	poll_wait(file, &usblp->wait, wait);
+ 	return ((!usblp->bidir || !usblp->rcomplete) ? 0 : POLLIN  | POLLRDNORM)
+ 			       | (!usblp->wcomplete ? 0 : POLLOUT | POLLWRNORM);
+}
+
+static int usblp_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct usblp *usblp = file->private_data;
+	int length, err, i;
+	unsigned char newChannel;
+	int status;
+	int twoints[2];
+	int retval = 0;
+
+	down (&usblp->sem);
+	if (!usblp->present) {
+		retval = -ENODEV;
+		goto done;
+	}
+
+	dbg("usblp_ioctl: cmd=0x%x (%c nr=%d len=%d dir=%d)", cmd, _IOC_TYPE(cmd),
+		_IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd) );
+
+	if (_IOC_TYPE(cmd) == 'P')	/* new-style ioctl number */
+
+		switch (_IOC_NR(cmd)) {
+
+			case IOCNR_GET_DEVICE_ID: /* get the DEVICE_ID string */
+				if (_IOC_DIR(cmd) != _IOC_READ) {
+					retval = -EINVAL;
+					goto done;
+				}
+
+				length = usblp_cache_device_id_string(usblp);
+				if (length < 0) {
+					retval = length;
+					goto done;
+				}
+				if (length > _IOC_SIZE(cmd))
+					length = _IOC_SIZE(cmd); /* truncate */
+
+				if (copy_to_user((void __user *) arg,
+						usblp->device_id_string,
+						(unsigned long) length)) {
+					retval = -EFAULT;
+					goto done;
+				}
+
+				break;
+
+			case IOCNR_GET_PROTOCOLS:
+				if (_IOC_DIR(cmd) != _IOC_READ ||
+				    _IOC_SIZE(cmd) < sizeof(twoints)) {
+					retval = -EINVAL;
+					goto done;
+				}
+
+				twoints[0] = usblp->current_protocol;
+				twoints[1] = 0;
+				for (i = USBLP_FIRST_PROTOCOL;
+				     i <= USBLP_LAST_PROTOCOL; i++) {
+					if (usblp->protocol[i].alt_setting >= 0)
+						twoints[1] |= (1<<i);
+				}
+
+				if (copy_to_user((void __user *)arg,
+						(unsigned char *)twoints,
+						sizeof(twoints))) {
+					retval = -EFAULT;
+					goto done;
+				}
+
+				break;
+
+			case IOCNR_SET_PROTOCOL:
+				if (_IOC_DIR(cmd) != _IOC_WRITE) {
+					retval = -EINVAL;
+					goto done;
+				}
+
+#ifdef DEBUG
+				if (arg == -10) {
+					usblp_dump(usblp);
+					break;
+				}
+#endif
+
+				usblp_unlink_urbs(usblp);
+				retval = usblp_set_protocol(usblp, arg);
+				if (retval < 0) {
+					usblp_set_protocol(usblp,
+						usblp->current_protocol);
+				}
+				break;
+
+			case IOCNR_HP_SET_CHANNEL:
+				if (_IOC_DIR(cmd) != _IOC_WRITE ||
+				    le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 ||
+				    usblp->quirks & USBLP_QUIRK_BIDIR) {
+					retval = -EINVAL;
+					goto done;
+				}
+
+				err = usblp_hp_channel_change_request(usblp,
+					arg, &newChannel);
+				if (err < 0) {
+					err("usblp%d: error = %d setting "
+						"HP channel",
+						usblp->minor, err);
+					retval = -EIO;
+					goto done;
+				}
+
+				dbg("usblp%d requested/got HP channel %ld/%d",
+					usblp->minor, arg, newChannel);
+				break;
+
+			case IOCNR_GET_BUS_ADDRESS:
+				if (_IOC_DIR(cmd) != _IOC_READ ||
+				    _IOC_SIZE(cmd) < sizeof(twoints)) {
+					retval = -EINVAL;
+					goto done;
+				}
+
+				twoints[0] = usblp->dev->bus->busnum;
+				twoints[1] = usblp->dev->devnum;
+				if (copy_to_user((void __user *)arg,
+						(unsigned char *)twoints,
+						sizeof(twoints))) {
+					retval = -EFAULT;
+					goto done;
+				}
+
+				dbg("usblp%d is bus=%d, device=%d",
+					usblp->minor, twoints[0], twoints[1]);
+				break;
+
+			case IOCNR_GET_VID_PID:
+				if (_IOC_DIR(cmd) != _IOC_READ ||
+				    _IOC_SIZE(cmd) < sizeof(twoints)) {
+					retval = -EINVAL;
+					goto done;
+				}
+
+				twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor);
+				twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct);
+				if (copy_to_user((void __user *)arg,
+						(unsigned char *)twoints,
+						sizeof(twoints))) {
+					retval = -EFAULT;
+					goto done;
+				}
+
+				dbg("usblp%d is VID=0x%4.4X, PID=0x%4.4X",
+					usblp->minor, twoints[0], twoints[1]);
+				break;
+
+			case IOCNR_SOFT_RESET:
+				if (_IOC_DIR(cmd) != _IOC_NONE) {
+					retval = -EINVAL;
+					goto done;
+				}
+				retval = usblp_reset(usblp);
+				break;
+			default:
+				retval = -ENOTTY;
+		}
+	else	/* old-style ioctl value */
+		switch (cmd) {
+
+			case LPGETSTATUS:
+				if (usblp_read_status(usblp, usblp->statusbuf)) {
+					err("usblp%d: failed reading printer status", usblp->minor);
+					retval = -EIO;
+					goto done;
+				}
+				status = *usblp->statusbuf;
+				if (copy_to_user ((void __user *)arg, &status, sizeof(int)))
+					retval = -EFAULT;
+				break;
+
+			default:
+				retval = -ENOTTY;
+		}
+
+done:
+	up (&usblp->sem);
+	return retval;
+}
+
+static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	struct usblp *usblp = file->private_data;
+	int timeout, err = 0, transfer_length = 0;
+	size_t writecount = 0;
+
+	while (writecount < count) {
+		if (!usblp->wcomplete) {
+			barrier();
+			if (file->f_flags & O_NONBLOCK) {
+				writecount += transfer_length;
+				return writecount ? writecount : -EAGAIN;
+			}
+
+			timeout = USBLP_WRITE_TIMEOUT;
+			add_wait_queue(&usblp->wait, &wait);
+			while ( 1==1 ) {
+
+				if (signal_pending(current)) {
+					remove_wait_queue(&usblp->wait, &wait);
+					return writecount ? writecount : -EINTR;
+				}
+				set_current_state(TASK_INTERRUPTIBLE);
+				if (timeout && !usblp->wcomplete) {
+					timeout = schedule_timeout(timeout);
+				} else {
+					set_current_state(TASK_RUNNING);
+					break;
+				}
+			}
+			remove_wait_queue(&usblp->wait, &wait);
+		}
+
+		down (&usblp->sem);
+		if (!usblp->present) {
+			up (&usblp->sem);
+			return -ENODEV;
+		}
+
+		if (usblp->writeurb->status != 0) {
+			if (usblp->quirks & USBLP_QUIRK_BIDIR) {
+				if (!usblp->wcomplete)
+					err("usblp%d: error %d writing to printer",
+						usblp->minor, usblp->writeurb->status);
+				err = usblp->writeurb->status;
+			} else
+				err = usblp_check_status(usblp, err);
+			up (&usblp->sem);
+
+			/* if the fault was due to disconnect, let khubd's
+			 * call to usblp_disconnect() grab usblp->sem ...
+			 */
+			schedule ();
+			continue;
+		}
+
+		/* We must increment writecount here, and not at the
+		 * end of the loop. Otherwise, the final loop iteration may
+		 * be skipped, leading to incomplete printer output.
+		 */
+		writecount += transfer_length;
+		if (writecount == count) {
+			up(&usblp->sem);
+			break;
+		}
+
+		transfer_length=(count - writecount);
+		if (transfer_length > USBLP_BUF_SIZE)
+			transfer_length = USBLP_BUF_SIZE;
+
+		usblp->writeurb->transfer_buffer_length = transfer_length;
+
+		if (copy_from_user(usblp->writeurb->transfer_buffer, 
+				   buffer + writecount, transfer_length)) {
+			up(&usblp->sem);
+			return writecount ? writecount : -EFAULT;
+		}
+
+		usblp->writeurb->dev = usblp->dev;
+		usblp->wcomplete = 0;
+		err = usb_submit_urb(usblp->writeurb, GFP_KERNEL);
+		if (err) {
+			if (err != -ENOMEM)
+				count = -EIO;
+			else
+				count = writecount ? writecount : -ENOMEM;
+			up (&usblp->sem);
+			break;
+		}
+		up (&usblp->sem);
+	}
+
+	return count;
+}
+
+static ssize_t usblp_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
+{
+	struct usblp *usblp = file->private_data;
+	DECLARE_WAITQUEUE(wait, current);
+
+	if (!usblp->bidir)
+		return -EINVAL;
+
+	down (&usblp->sem);
+	if (!usblp->present) {
+		count = -ENODEV;
+		goto done;
+	}
+
+	if (!usblp->rcomplete) {
+		barrier();
+
+		if (file->f_flags & O_NONBLOCK) {
+			count = -EAGAIN;
+			goto done;
+		}
+
+		add_wait_queue(&usblp->wait, &wait);
+		while (1==1) {
+			if (signal_pending(current)) {
+				count = -EINTR;
+				remove_wait_queue(&usblp->wait, &wait);
+				goto done;
+			}
+			up (&usblp->sem);
+			set_current_state(TASK_INTERRUPTIBLE);
+			if (!usblp->rcomplete) {
+				schedule();
+			} else {
+				set_current_state(TASK_RUNNING);
+				break;
+			}
+			down (&usblp->sem);
+		}
+		remove_wait_queue(&usblp->wait, &wait);
+	}
+
+	if (!usblp->present) {
+		count = -ENODEV;
+		goto done;
+	}
+
+	if (usblp->readurb->status) {
+		err("usblp%d: error %d reading from printer",
+			usblp->minor, usblp->readurb->status);
+		usblp->readurb->dev = usblp->dev;
+ 		usblp->readcount = 0;
+		usblp->rcomplete = 0;
+		if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0)
+			dbg("error submitting urb");
+		count = -EIO;
+		goto done;
+	}
+
+	count = count < usblp->readurb->actual_length - usblp->readcount ?
+		count :	usblp->readurb->actual_length - usblp->readcount;
+
+	if (copy_to_user(buffer, usblp->readurb->transfer_buffer + usblp->readcount, count)) {
+		count = -EFAULT;
+		goto done;
+	}
+
+	if ((usblp->readcount += count) == usblp->readurb->actual_length) {
+		usblp->readcount = 0;
+		usblp->readurb->dev = usblp->dev;
+		usblp->rcomplete = 0;
+		if (usb_submit_urb(usblp->readurb, GFP_KERNEL)) {
+			count = -EIO;
+			goto done;
+		}
+	}
+
+done:
+	up (&usblp->sem);
+	return count;
+}
+
+/*
+ * Checks for printers that have quirks, such as requiring unidirectional
+ * communication but reporting bidirectional; currently some HP printers
+ * have this flaw (HP 810, 880, 895, etc.), or needing an init string
+ * sent at each open (like some Epsons).
+ * Returns 1 if found, 0 if not found.
+ *
+ * HP recommended that we use the bidirectional interface but
+ * don't attempt any bulk IN transfers from the IN endpoint.
+ * Here's some more detail on the problem:
+ * The problem is not that it isn't bidirectional though. The problem
+ * is that if you request a device ID, or status information, while
+ * the buffers are full, the return data will end up in the print data
+ * buffer. For example if you make sure you never request the device ID
+ * while you are sending print data, and you don't try to query the
+ * printer status every couple of milliseconds, you will probably be OK.
+ */
+static unsigned int usblp_quirks (__u16 vendor, __u16 product)
+{
+	int i;
+
+	for (i = 0; quirk_printers[i].vendorId; i++) {
+		if (vendor == quirk_printers[i].vendorId &&
+		    product == quirk_printers[i].productId)
+			return quirk_printers[i].quirks;
+ 	}
+	return 0;
+}
+
+static struct file_operations usblp_fops = {
+	.owner =	THIS_MODULE,
+	.read =		usblp_read,
+	.write =	usblp_write,
+	.poll =		usblp_poll,
+	.ioctl =	usblp_ioctl,
+	.open =		usblp_open,
+	.release =	usblp_release,
+};
+
+static struct usb_class_driver usblp_class = {
+	.name =		"usb/lp%d",
+	.fops =		&usblp_fops,
+	.mode =		S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
+	.minor_base =	USBLP_MINOR_BASE,
+};
+
+static int usblp_probe(struct usb_interface *intf,
+		       const struct usb_device_id *id)
+{
+	struct usb_device *dev = interface_to_usbdev (intf);
+	struct usblp *usblp = NULL;
+	int protocol;
+	int retval;
+
+	/* Malloc and start initializing usblp structure so we can use it
+	 * directly. */
+	if (!(usblp = kmalloc(sizeof(struct usblp), GFP_KERNEL))) {
+		err("out of memory for usblp");
+		goto abort;
+	}
+	memset(usblp, 0, sizeof(struct usblp));
+	usblp->dev = dev;
+	init_MUTEX (&usblp->sem);
+	init_waitqueue_head(&usblp->wait);
+	usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
+	usblp->intf = intf;
+
+	usblp->writeurb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!usblp->writeurb) {
+		err("out of memory");
+		goto abort;
+	}
+	usblp->readurb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!usblp->readurb) {
+		err("out of memory");
+		goto abort;
+	}
+
+	/* Malloc device ID string buffer to the largest expected length,
+	 * since we can re-query it on an ioctl and a dynamic string
+	 * could change in length. */
+	if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) {
+		err("out of memory for device_id_string");
+		goto abort;
+	}
+
+	usblp->writebuf = usblp->readbuf = NULL;
+	usblp->writeurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
+	usblp->readurb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
+	/* Malloc write & read buffers.  We somewhat wastefully
+	 * malloc both regardless of bidirectionality, because the
+	 * alternate setting can be changed later via an ioctl. */
+	if (!(usblp->writebuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
+				GFP_KERNEL, &usblp->writeurb->transfer_dma))) {
+		err("out of memory for write buf");
+		goto abort;
+	}
+	if (!(usblp->readbuf = usb_buffer_alloc(dev, USBLP_BUF_SIZE,
+				GFP_KERNEL, &usblp->readurb->transfer_dma))) {
+		err("out of memory for read buf");
+		goto abort;
+	}
+
+	/* Allocate buffer for printer status */
+	usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL);
+	if (!usblp->statusbuf) {
+		err("out of memory for statusbuf");
+		goto abort;
+	}
+
+	/* Lookup quirks for this printer. */
+	usblp->quirks = usblp_quirks(
+		le16_to_cpu(dev->descriptor.idVendor),
+		le16_to_cpu(dev->descriptor.idProduct));
+
+	/* Analyze and pick initial alternate settings and endpoints. */
+	protocol = usblp_select_alts(usblp);
+	if (protocol < 0) {
+		dbg("incompatible printer-class device 0x%4.4X/0x%4.4X",
+			le16_to_cpu(dev->descriptor.idVendor),
+			le16_to_cpu(dev->descriptor.idProduct));
+		goto abort;
+	}
+
+	/* Setup the selected alternate setting and endpoints. */
+	if (usblp_set_protocol(usblp, protocol) < 0)
+		goto abort;
+
+	/* Retrieve and store the device ID string. */
+	usblp_cache_device_id_string(usblp);
+
+#ifdef DEBUG
+	usblp_check_status(usblp, 0);
+#endif
+
+	info("usblp%d: USB %sdirectional printer dev %d "
+		"if %d alt %d proto %d vid 0x%4.4X pid 0x%4.4X",
+		usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum,
+		usblp->ifnum,
+		usblp->protocol[usblp->current_protocol].alt_setting,
+		usblp->current_protocol,
+		le16_to_cpu(usblp->dev->descriptor.idVendor),
+		le16_to_cpu(usblp->dev->descriptor.idProduct));
+
+	usb_set_intfdata (intf, usblp);
+
+	usblp->present = 1;
+
+	retval = usb_register_dev(intf, &usblp_class);
+	if (retval) {
+		err("Not able to get a minor for this device.");
+		goto abort_intfdata;
+	}
+	usblp->minor = intf->minor;
+
+	return 0;
+
+abort_intfdata:
+	usb_set_intfdata (intf, NULL);
+abort:
+	if (usblp) {
+		if (usblp->writebuf)
+			usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
+				usblp->writebuf, usblp->writeurb->transfer_dma);
+		if (usblp->readbuf)
+			usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
+				usblp->readbuf, usblp->writeurb->transfer_dma);
+		kfree(usblp->statusbuf);
+		kfree(usblp->device_id_string);
+		usb_free_urb(usblp->writeurb);
+		usb_free_urb(usblp->readurb);
+		kfree(usblp);
+	}
+	return -EIO;
+}
+
+/*
+ * We are a "new" style driver with usb_device_id table,
+ * but our requirements are too intricate for simple match to handle.
+ *
+ * The "proto_bias" option may be used to specify the preferred protocol
+ * for all USB printers (1=7/1/1, 2=7/1/2, 3=7/1/3).  If the device
+ * supports the preferred protocol, then we bind to it.
+ *
+ * The best interface for us is 7/1/2, because it is compatible
+ * with a stream of characters. If we find it, we bind to it.
+ *
+ * Note that the people from hpoj.sourceforge.net need to be able to
+ * bind to 7/1/3 (MLC/1284.4), so we provide them ioctls for this purpose.
+ *
+ * Failing 7/1/2, we look for 7/1/3, even though it's probably not
+ * stream-compatible, because this matches the behaviour of the old code.
+ *
+ * If nothing else, we bind to 7/1/1 - the unidirectional interface.
+ */
+static int usblp_select_alts(struct usblp *usblp)
+{
+	struct usb_interface *if_alt;
+	struct usb_host_interface *ifd;
+	struct usb_endpoint_descriptor *epd, *epwrite, *epread;
+	int p, i, e;
+
+	if_alt = usblp->intf;
+
+	for (p = 0; p < USBLP_MAX_PROTOCOLS; p++)
+		usblp->protocol[p].alt_setting = -1;
+
+	/* Find out what we have. */
+	for (i = 0; i < if_alt->num_altsetting; i++) {
+		ifd = &if_alt->altsetting[i];
+
+		if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
+			continue;
+
+		if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
+		    ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)
+			continue;
+
+		/* Look for bulk OUT and IN endpoints. */
+		epwrite = epread = NULL;
+		for (e = 0; e < ifd->desc.bNumEndpoints; e++) {
+			epd = &ifd->endpoint[e].desc;
+
+			if ((epd->bmAttributes&USB_ENDPOINT_XFERTYPE_MASK)!=
+			    USB_ENDPOINT_XFER_BULK)
+				continue;
+
+			if (!(epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK)) {
+				if (!epwrite)
+					epwrite = epd;
+
+			} else {
+				if (!epread)
+					epread = epd;
+			}
+		}
+
+		/* Ignore buggy hardware without the right endpoints. */
+		if (!epwrite || (ifd->desc.bInterfaceProtocol > 1 && !epread))
+			continue;
+
+		/* Turn off reads for 7/1/1 (unidirectional) interfaces
+		 * and buggy bidirectional printers. */
+		if (ifd->desc.bInterfaceProtocol == 1) {
+			epread = NULL;
+		} else if (usblp->quirks & USBLP_QUIRK_BIDIR) {
+			info("Disabling reads from problem bidirectional "
+				"printer on usblp%d", usblp->minor);
+			epread = NULL;
+		}
+
+		usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting =
+				ifd->desc.bAlternateSetting;
+		usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite;
+		usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread;
+	}
+
+	/* If our requested protocol is supported, then use it. */
+	if (proto_bias >= USBLP_FIRST_PROTOCOL &&
+	    proto_bias <= USBLP_LAST_PROTOCOL &&
+	    usblp->protocol[proto_bias].alt_setting != -1)
+		return proto_bias;
+
+	/* Ordering is important here. */
+	if (usblp->protocol[2].alt_setting != -1)
+		return 2;
+	if (usblp->protocol[1].alt_setting != -1)
+		return 1;
+	if (usblp->protocol[3].alt_setting != -1)
+		return 3;
+
+	/* If nothing is available, then don't bind to this device. */
+	return -1;
+}
+
+static int usblp_set_protocol(struct usblp *usblp, int protocol)
+{
+	int r, alts;
+
+	if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
+		return -EINVAL;
+
+	alts = usblp->protocol[protocol].alt_setting;
+	if (alts < 0)
+		return -EINVAL;
+	r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
+	if (r < 0) {
+		err("can't set desired altsetting %d on interface %d",
+			alts, usblp->ifnum);
+		return r;
+	}
+
+	usb_fill_bulk_urb(usblp->writeurb, usblp->dev,
+		usb_sndbulkpipe(usblp->dev,
+		  usblp->protocol[protocol].epwrite->bEndpointAddress),
+		usblp->writebuf, 0,
+		usblp_bulk_write, usblp);
+
+	usblp->bidir = (usblp->protocol[protocol].epread != NULL);
+	if (usblp->bidir)
+		usb_fill_bulk_urb(usblp->readurb, usblp->dev,
+			usb_rcvbulkpipe(usblp->dev,
+			  usblp->protocol[protocol].epread->bEndpointAddress),
+			usblp->readbuf, USBLP_BUF_SIZE,
+			usblp_bulk_read, usblp);
+
+	usblp->current_protocol = protocol;
+	dbg("usblp%d set protocol %d", usblp->minor, protocol);
+	return 0;
+}
+
+/* Retrieves and caches device ID string.
+ * Returns length, including length bytes but not null terminator.
+ * On error, returns a negative errno value. */
+static int usblp_cache_device_id_string(struct usblp *usblp)
+{
+	int err, length;
+
+	err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
+	if (err < 0) {
+		dbg("usblp%d: error = %d reading IEEE-1284 Device ID string",
+			usblp->minor, err);
+		usblp->device_id_string[0] = usblp->device_id_string[1] = '\0';
+		return -EIO;
+	}
+
+	/* First two bytes are length in big-endian.
+	 * They count themselves, and we copy them into
+	 * the user's buffer. */
+	length = be16_to_cpu(*((__be16 *)usblp->device_id_string));
+	if (length < 2)
+		length = 2;
+	else if (length >= USBLP_DEVICE_ID_SIZE)
+		length = USBLP_DEVICE_ID_SIZE - 1;
+	usblp->device_id_string[length] = '\0';
+
+	dbg("usblp%d Device ID string [len=%d]=\"%s\"",
+		usblp->minor, length, &usblp->device_id_string[2]);
+
+	return length;
+}
+
+static void usblp_disconnect(struct usb_interface *intf)
+{
+	struct usblp *usblp = usb_get_intfdata (intf);
+
+	usb_deregister_dev(intf, &usblp_class);
+
+	if (!usblp || !usblp->dev) {
+		err("bogus disconnect");
+		BUG ();
+	}
+
+	down (&usblp_sem);
+	down (&usblp->sem);
+	usblp->present = 0;
+	usb_set_intfdata (intf, NULL);
+
+	usblp_unlink_urbs(usblp);
+	usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
+			usblp->writebuf, usblp->writeurb->transfer_dma);
+	usb_buffer_free (usblp->dev, USBLP_BUF_SIZE,
+			usblp->readbuf, usblp->readurb->transfer_dma);
+	up (&usblp->sem);
+
+	if (!usblp->used)
+		usblp_cleanup (usblp);
+	up (&usblp_sem);
+}
+
+static struct usb_device_id usblp_ids [] = {
+	{ USB_DEVICE_INFO(7, 1, 1) },
+	{ USB_DEVICE_INFO(7, 1, 2) },
+	{ USB_DEVICE_INFO(7, 1, 3) },
+	{ USB_INTERFACE_INFO(7, 1, 1) },
+	{ USB_INTERFACE_INFO(7, 1, 2) },
+	{ USB_INTERFACE_INFO(7, 1, 3) },
+	{ }						/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, usblp_ids);
+
+static struct usb_driver usblp_driver = {
+	.owner =	THIS_MODULE,
+	.name =		"usblp",
+	.probe =	usblp_probe,
+	.disconnect =	usblp_disconnect,
+	.id_table =	usblp_ids,
+};
+
+static int __init usblp_init(void)
+{
+	int retval;
+	retval = usb_register(&usblp_driver);
+	if (retval)
+		goto out;
+	info(DRIVER_VERSION ": " DRIVER_DESC);
+out:
+	return retval;
+}
+
+static void __exit usblp_exit(void)
+{
+	usb_deregister(&usblp_driver);
+}
+
+module_init(usblp_init);
+module_exit(usblp_exit);
+
+MODULE_AUTHOR( DRIVER_AUTHOR );
+MODULE_DESCRIPTION( DRIVER_DESC );
+module_param(proto_bias, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(proto_bias, "Favourite protocol number");
+MODULE_LICENSE("GPL");