/* -*- linux-c -*- */

/* 
 * Driver for USB Scanners (linux-2.4.12)
 *
 * Copyright (C) 1999, 2000, 2001 David E. Nelson
 *
 * Portions may be copyright Brad Keryan and Michael Gee.
 *
 * David E. Nelson (dnelson@jump.net)
 * 
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Originally based upon mouse.c (Brad Keryan) and printer.c (Michael Gee).
 *
 * History
 *
 *  0.1  8/31/1999
 *
 *    Developed/tested using linux-2.3.15 with minor ohci.c changes to
 *    support short packes during bulk xfer mode.  Some testing was
 *    done with ohci-hcd but the performace was low.  Very limited
 *    testing was performed with uhci but I was unable to get it to
 *    work.  Initial relase to the linux-usb development effort.
 *
 *
 *  0.2  10/16/1999
 *
 *    - Device can't be opened unless a scanner is plugged into the USB.
 *    - Finally settled on a reasonable value for the I/O buffer's.
 *    - Cleaned up write_scanner()
 *    - Disabled read/write stats
 *    - A little more code cleanup
 *
 *
 *  0.3  10/18/1999
 *
 *    - Device registration changed to reflect new device
 *      allocation/registration for linux-2.3.22+.
 *    - Adopted David Brownell's <david-b@pacbell.net> technique for 
 *      assigning bulk endpoints.
 *    - Removed unnessesary #include's
 *    - Scanner model now reported via syslog INFO after being detected 
 *      *and* configured.
 *    - Added user specified vendor:product USB ID's which can be passed 
 *      as module parameters.
 *
 *
 *  0.3.1
 *
 *    - Applied patches for linux-2.3.25.
 *    - Error number reporting changed to reflect negative return codes.
 *
 *
 *  0.3.2
 *
 *    - Applied patches for linux-2.3.26 to scanner_init().
 *    - Debug read/write stats now report values as signed decimal.
 *
 *
 *  0.3.3
 *
 *    - Updated the bulk_msg() calls to usb usb_bulk_msg().
 *    - Added a small delay in the write_scanner() method to aid in
 *      avoiding NULL data reads on HP scanners.  We'll see how this works.
 *    - Return values from usb_bulk_msg() now ignore positive values for
 *      use with the ohci driver.
 *    - Added conditional debugging instead of commenting/uncommenting
 *      all over the place.
 *    - kfree()'d the pointer after using usb_string() as documented in
 *      linux-usb-api.txt.
 *    - Added usb_set_configuration().  It got lost in version 0.3 -- ack!
 *    - Added the HP 5200C USB Vendor/Product ID's.
 *
 *
 *  0.3.4  1/23/2000
 *
 *    - Added Greg K-H's <greg@kroah.com> patch for better handling of 
 *      Product/Vendor detection.
 *    - The driver now autoconfigures its endpoints including interrupt
 *      endpoints if one is detected.  The concept was originally based
 *      upon David Brownell's method.
 *    - Added some Seiko/Epson ID's. Thanks to Karl Heinz 
 *      Kremer <khk@khk.net>.
 *    - Added some preliminary ioctl() calls for the PV8630 which is used
 *      by the HP4200. The ioctl()'s still have to be registered. Thanks 
 *      to Adrian Perez Jorge <adrianpj@easynews.com>.
 *    - Moved/migrated stuff to scanner.h
 *    - Removed the usb_set_configuration() since this is handled by
 *      the usb_new_device() routine in usb.c.
 *    - Added the HP 3300C.  Thanks to Bruce Tenison.
 *    - Changed user specified vendor/product id so that root hub doesn't
 *      get falsely attached to. Thanks to Greg K-H.
 *    - Added some Mustek ID's. Thanks to Gernot Hoyler 
 *      <Dr.Hoyler@t-online.de>.
 *    - Modified the usb_string() reporting.  See kfree() comment above.
 *    - Added Umax Astra 2000U. Thanks to Doug Alcorn <doug@lathi.net>.
 *    - Updated the printk()'s to use the info/warn/dbg macros.
 *    - Updated usb_bulk_msg() argument types to fix gcc warnings.
 *
 *
 *  0.4  2/4/2000
 *
 *    - Removed usb_string() from probe_scanner since the core now does a
 *      good job of reporting what was connnected.  
 *    - Finally, simultaneous multiple device attachment!
 *    - Fixed some potential memory freeing issues should memory allocation
 *      fail in probe_scanner();
 *    - Some fixes to disconnect_scanner().
 *    - Added interrupt endpoint support.
 *    - Added Agfa SnapScan Touch. Thanks to Jan Van den Bergh
 *      <jan.vandenbergh@cs.kuleuven.ac.be>.
 *    - Added Umax 1220U ID's. Thanks to Maciek Klimkowski
 *      <mac@nexus.carleton.ca>.
 *    - Fixed bug in write_scanner(). The buffer was not being properly
 *      updated for writes larger than OBUF_SIZE. Thanks to Henrik 
 *      Johansson <henrikjo@post.utfors.se> for identifying it.
 *    - Added Microtek X6 ID's. Thanks to Oliver Neukum
 *      <Oliver.Neukum@lrz.uni-muenchen.de>.
 *
 * 
 *  0.4.1  2/15/2000
 *  
 *    - Fixed 'count' bug in read_scanner(). Thanks to Henrik
 *      Johansson <henrikjo@post.utfors.se> for identifying it.  Amazing
 *      it has worked this long.
 *    - Fixed '>=' bug in both read/write_scanner methods.
 *    - Cleaned up both read/write_scanner() methods so that they are 
 *      a little more readable.
 *    - Added a lot of Microtek ID's.  Thanks to Adrian Perez Jorge.
 *    - Adopted the __initcall().
 *    - Added #include <linux/init.h> to scanner.h for __initcall().
 *    - Added one liner in irq_scanner() to keep gcc from complaining 
 *      about an unused variable (data) if debugging was disabled
 *      in scanner.c.
 *    - Increased the timeout parameter in read_scanner() to 120 Secs.
 *
 *
 *  0.4.2  3/23/2000
 *
 *    - Added Umax 1236U ID.  Thanks to Philipp Baer <ph_baer@npw.net>.
 *    - Added Primax, ReadyScan, Visioneer, Colorado, and Genius ID's.
 *      Thanks to Adrian Perez Jorge <adrianpj@easynews.com>.
 *    - Fixed error number reported for non-existant devices.  Thanks to
 *      Spyridon Papadimitriou <Spyridon_Papadimitriou@gs91.sp.cs.cmu.edu>.
 *    - Added Acer Prisascan 620U ID's.  Thanks to Joao <joey@knoware.nl>.
 *    - Replaced __initcall() with module_init()/module_exit(). Updates
 *      from patch-2.3.48.
 *    - Replaced file_operations structure with new syntax.  Updates
 *      from patch-2.3.49.
 *    - Changed #include "usb.h" to #include <linux/usb.h>
 *    - Added #define SCN_IOCTL to exclude development areas 
 *      since 2.4.x is about to be released. This mainly affects the 
 *      ioctl() stuff.  See scanner.h for more details.
 *    - Changed the return value for signal_pending() from -ERESTARTSYS to
 *      -EINTR.
 *
 *
 * 0.4.3  4/30/2000
 *
 *    - Added Umax Astra 2200 ID.  Thanks to Flynn Marquardt 
 *      <flynn@isr.uni-stuttgart.de>.
 *    - Added iVina 1200U ID. Thanks to Dyson Lin <dyson@avision.com.tw>.
 *    - Added access time update for the device file courtesy of Paul
 *      Mackerras <paulus@samba.org>.  This allows a user space daemon
 *      to turn the lamp off for a Umax 1220U scanner after a prescribed
 *      time.
 *    - Fixed HP S20 ID's.  Thanks to Ruud Linders <rlinders@xs4all.nl>.
 *    - Added Acer ScanPrisa 620U ID. Thanks to Oliver
 *      Schwartz <Oliver.Schwartz@gmx.de> via sane-devel mail list.
 *    - Fixed bug in read_scanner for copy_to_user() function.  The returned
 *      value should be 'partial' not 'this_read'.
 *    - Fixed bug in read_scanner. 'count' should be decremented 
 *      by 'this_read' and not by 'partial'.  This resulted in twice as many
 *      calls to read_scanner() for small amounts of data and possibly
 *      unexpected returns of '0'.  Thanks to Karl Heinz 
 *      Kremer <khk@khk.net> and Alain Knaff <Alain.Knaff@ltnb.lu>
 *      for discovering this.
 *    - Integrated Randy Dunlap's <randy.dunlap@intel.com> patch for a
 *      scanner lookup/ident table. Thanks Randy.
 *    - Documentation updates.
 *    - Added wait queues to read_scanner().
 *
 *
 * 0.4.3.1
 *
 *    - Fixed HP S20 ID's...again..sigh.  Thanks to Ruud
 *      Linders <rlinders@xs4all.nl>.
 *
 * 0.4.4
 *    - Added addtional Mustek ID's (BearPaw 1200, 600 CU, 1200 USB,
 *      and 1200 UB.  Thanks to Henning Meier-Geinitz <henningmg@gmx.de>.
 *    - Added the Vuego Scan Brisa 340U ID's.  Apparently this scanner is
 *      marketed by Acer Peripherals as a cheap 300 dpi model. Thanks to
 *      David Gundersen <gundersd@paradise.net.nz>.
 *    - Added the Epson Expression1600 ID's. Thanks to Karl Heinz
 *      Kremer <khk@khk.net>.
 *
 * 0.4.5  2/28/2001
 *    - Added Mustek ID's (BearPaw 2400, 1200 CU Plus, BearPaw 1200F).
 *      Thanks to Henning Meier-Geinitz <henningmg@gmx.de>.
 *    - Added read_timeout module parameter to override RD_NAK_TIMEOUT
 *      when read()'ing from devices.
 *    - Stalled pipes are now checked and cleared with
 *      usb_clear_halt() for the read_scanner() function. This should
 *      address the "funky result: -32" error messages.
 *    - Removed Microtek scanner ID's.  Microtek scanners are now
 *      supported via the drivers/usb/microtek.c driver.
 *    - Added scanner specific read timeout's.
 *    - Return status errors are NEGATIVE!!!  This should address the
 *      "funky result: -110" error messages.
 *    - Replaced USB_ST_TIMEOUT with ETIMEDOUT.
 *    - rd_nak was still defined in MODULE_PARM.  It's been updated with
 *      read_timeout.  Thanks to Mark W. Webb <markwebb@adelphia.net> for
 *      reporting this bug.
 *    - Added Epson Perfection 1640SU and 1640SU Photo.  Thanks to
 *      Jean-Luc <f5ibh@db0bm.ampr.org> and Manuel
 *      Pelayo <Manuel.Pelayo@sesips.org>. Reported to work fine by Manuel.
 *
 * 0.4.6  9/27/2001
 *    - Added IOCTL's to report back scanner USB ID's.  Thanks to
 *      Karl Heinz <khk@lynx.phpwebhosting.com>
 *    - Added Umax Astra 2100U ID's.  Thanks to Ron
 *      Wellsted <ron@wellsted.org.uk>.
 *      and Manuel Pelayo <Manuel.Pelayo@sesips.org>.
 *    - Added HP 3400 ID's. Thanks to Harald Hannelius <harald@iki.fi>
 *      and Bertrik Sikken <bertrik@zonnet.nl>.  Reported to work at
 *      htpp://home.zonnet.nl/bertrik/hp3300c/hp3300c.htm.
 *    - Added Minolta Dimage Scan Dual II ID's.  Thanks to Jose Paulo
 *      Moitinho de Almeida <moitinho@civil.ist.utl.pt>
 *    - Confirmed addition for SnapScan E20.  Thanks to Steffen H黚ner
 *      <hueb_s@gmx.de>.
 *    - Added Lifetec LT9385 ID's.  Thanks to Van Bruwaene Kris
 *      <krvbr@yahoo.co.uk>
 *    - Added Agfa SnapScan e26 ID's.  Reported to work with SANE
 *      1.0.5.  Thanks to Falk Sauer <falk@mgnkatze.franken.de>.
 *    - Added HP 4300 ID's.  Thanks to Stefan Schlosser
 *      <castla@grmmbl.org>.
 *    - Added Relisis Episode ID's.  Thanks to Manfred
 *      Morgner <odb-devel@gmx.net>.
 *    - Added many Acer ID's. Thanks to Oliver
 *      Schwartz <Oliver.Schwartz@gmx.de>.
 *    - Added Snapscan e40 ID's.  Thanks to Oliver
 *      Schwartz <Oliver.Schwartz@gmx.de>.
 *    - Thanks to Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de>
 *      for helping with races.
 *    - Added Epson Perfection 1650 ID's. Thanks to Karl Heinz
 *      Kremer <khk@khk.net>.
 *    - Added Epson Perfection 2450 ID's (aka GT-9700 for the Japanese
 *      market).  Thanks to Karl Heinz Kremer <khk@khk.net>.
 *    - Added Mustek 600 USB ID's.  Thanks to Marcus
 *      Alanen <maalanen@ra.abo.fi>.
 *    - Added Acer ScanPrisa 1240UT ID's.  Thanks to Morgan
 *      Collins <sirmorcant@morcant.org>.
 *    - Incorporated devfs patches!! Thanks to Tom Rini
 *      <trini@kernel.crashing.org>, Pavel Roskin <proski@gnu.org>,
 *      Greg KH <greg@kroah.com>, Yves Duret <yduret@mandrakesoft.com>,
 *      Flavio Stanchina <flavio.stanchina@tin.it>.
 *    - Removed Minolta ScanImage II.  This scanner uses USB SCSI.  Thanks
 *      to Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de> for pointing
 *      this out.
 *    - Added additional SMP locking.  Thanks to David Brownell and 
 *      Oliver Neukum for their help.
 *    - Added version reporting - reports for both module load and modinfo
 *    - Started path to hopefully straighten/clean out ioctl()'s.
 *    - Users are now notified to consult the Documentation/usb/scanner.txt
 *      for common error messages rather than the maintainer.
 *
 * 0.4.7  11/28/2001
 *    - Fixed typo in Documentation/scanner.txt.  Thanks to
 *      Karel <karel.vervaeke@pandora.be> for pointing it out.
 *    - Added ID's for a Memorex 6136u. Thanks to 羖varo Gaspar de
 *      Valenzuela" <agaspard@utsi.edu>.
 *    - Added ID's for Agfa e25.  Thanks to Heinrich 
 *      Rust <Heinrich.Rust@gmx.de>.  Also reported to work with
 *      Linux and SANE (?).
 *    - Added Canon FB620U, D646U, and 1220U ID's.  Thanks to Paul
 *      Rensing <Paul_Rensing@StanfordAlumni.org>.  For more info
 *      on Linux support for these models, contact 
 *      salvestrini@users.sourceforge.net.
 *    - Added Plustek OpticPro UT12, OpticPro U24, KYE/Genius
 *      ColorPage-HR6 V2 ID's in addition to many "Unknown" models
 *      under those vendors.  Thanks to
 *      Jaeger, Gerhard" <g.jaeger@earthling.net>.  These scanner are
 *      apparently based upon the LM983x IC's.
 *    - Applied Frank's patch that addressed some locking and module
 *      referencing counts.  Thanks to both
 *      Frank Zago <fzago@greshamstorage.com> and
 *      Oliver Neukum <520047054719-0001@t-online.de> for reviewing/testing.
 *
 * 05/21/02 Currently maintained by Brian Beattie <beattie@beattie-home.net>
 *
 * TODO
 *    - Performance
 *    - Select/poll methods
 *    - More testing
 *    - Proper registry/assignment for LM9830 ioctl's
 *
 *
 *  Thanks to:
 *
 *    - All the folks on the linux-usb list who put up with me. :)  This 
 *      has been a great learning experience for me.
 *    - To Linus Torvalds for this great OS.
 *    - The GNU folks.
 *    - The folks that forwarded Vendor:Product ID's to me.
 *    - Johannes Erdfelt for the loaning of a USB analyzer for tracking an
 *      issue with HP-4100 and uhci.
 *    - Adolfo Montero for his assistance.
 *    - All the folks who chimed in with reports and suggestions.
 *    - All the developers that are working on USB SANE backends or other
 *      applications to use USB scanners.
 *
 *  Performance:
 *
 *    System: Pentium 120, 80 MB RAM, OHCI, Linux 2.3.23, HP 4100C USB Scanner
 *            300 dpi scan of the entire bed
 *      24 Bit Color ~ 70 secs - 3.6 Mbit/sec
 *       8 Bit Gray ~ 17 secs - 4.2 Mbit/sec */

#include <asm/byteorder.h>

/* 
 * Scanner definitions, macros, module info, 
 * debug/ioctl/data_dump enable, and other constants.
 */ 
#include "scanner.h"

static void
irq_scanner(struct urb *urb)
{

/*
 * For the meantime, this is just a placeholder until I figure out what
 * all I want to do with it -- or somebody else for that matter.
 */

	struct scn_usb_data *scn;
	unsigned char *data;
	scn = urb->context;

	data = &scn->button;
	data += 0;		/* Keep gcc from complaining about unused var */

	if (urb->status) {
		return;
	}

	dbg("irq_scanner(%d): data:%x", scn->scn_minor, *data);

	return;
}

static int
open_scanner(struct inode * inode, struct file * file)
{
	struct scn_usb_data *scn;
	struct usb_device *dev;

	int scn_minor;

	int err=0;

	MOD_INC_USE_COUNT;

	down(&scn_mutex);

	scn_minor = USB_SCN_MINOR(inode);