![Linus Torvalds](/assets/img/avatar_default.png)
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!
1215 lines
33 KiB
C
1215 lines
33 KiB
C
/*
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* usblp.c Version 0.13
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*
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* Copyright (c) 1999 Michael Gee <michael@linuxspecific.com>
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* Copyright (c) 1999 Pavel Machek <pavel@suse.cz>
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* Copyright (c) 2000 Randy Dunlap <rddunlap@osdl.org>
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* Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
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# Copyright (c) 2001 Pete Zaitcev <zaitcev@redhat.com>
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# Copyright (c) 2001 David Paschal <paschal@rcsis.com>
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*
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* USB Printer Device Class driver for USB printers and printer cables
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*
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* Sponsored by SuSE
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*
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* ChangeLog:
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* v0.1 - thorough cleaning, URBification, almost a rewrite
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* v0.2 - some more cleanups
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* v0.3 - cleaner again, waitqueue fixes
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* v0.4 - fixes in unidirectional mode
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* v0.5 - add DEVICE_ID string support
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* v0.6 - never time out
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* v0.7 - fixed bulk-IN read and poll (David Paschal)
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* v0.8 - add devfs support
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* v0.9 - fix unplug-while-open paths
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* v0.10- remove sleep_on, fix error on oom (oliver@neukum.org)
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* v0.11 - add proto_bias option (Pete Zaitcev)
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* v0.12 - add hpoj.sourceforge.net ioctls (David Paschal)
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* v0.13 - alloc space for statusbuf (<status> not on stack);
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* use usb_buffer_alloc() for read buf & write buf;
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/smp_lock.h>
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#include <linux/signal.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/lp.h>
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#undef DEBUG
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#include <linux/usb.h>
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v0.13"
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#define DRIVER_AUTHOR "Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal"
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#define DRIVER_DESC "USB Printer Device Class driver"
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#define USBLP_BUF_SIZE 8192
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#define USBLP_DEVICE_ID_SIZE 1024
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/* ioctls: */
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#define LPGETSTATUS 0x060b /* same as in drivers/char/lp.c */
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#define IOCNR_GET_DEVICE_ID 1
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#define IOCNR_GET_PROTOCOLS 2
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#define IOCNR_SET_PROTOCOL 3
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#define IOCNR_HP_SET_CHANNEL 4
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#define IOCNR_GET_BUS_ADDRESS 5
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#define IOCNR_GET_VID_PID 6
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#define IOCNR_SOFT_RESET 7
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/* Get device_id string: */
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#define LPIOC_GET_DEVICE_ID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_DEVICE_ID, len)
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/* The following ioctls were added for http://hpoj.sourceforge.net: */
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/* Get two-int array:
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* [0]=current protocol (1=7/1/1, 2=7/1/2, 3=7/1/3),
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* [1]=supported protocol mask (mask&(1<<n)!=0 means 7/1/n supported): */
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#define LPIOC_GET_PROTOCOLS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_PROTOCOLS, len)
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/* Set protocol (arg: 1=7/1/1, 2=7/1/2, 3=7/1/3): */
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#define LPIOC_SET_PROTOCOL _IOC(_IOC_WRITE, 'P', IOCNR_SET_PROTOCOL, 0)
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/* Set channel number (HP Vendor-specific command): */
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#define LPIOC_HP_SET_CHANNEL _IOC(_IOC_WRITE, 'P', IOCNR_HP_SET_CHANNEL, 0)
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/* Get two-int array: [0]=bus number, [1]=device address: */
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#define LPIOC_GET_BUS_ADDRESS(len) _IOC(_IOC_READ, 'P', IOCNR_GET_BUS_ADDRESS, len)
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/* Get two-int array: [0]=vendor ID, [1]=product ID: */
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#define LPIOC_GET_VID_PID(len) _IOC(_IOC_READ, 'P', IOCNR_GET_VID_PID, len)
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/* Perform class specific soft reset */
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#define LPIOC_SOFT_RESET _IOC(_IOC_NONE, 'P', IOCNR_SOFT_RESET, 0);
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/*
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* A DEVICE_ID string may include the printer's serial number.
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* It should end with a semi-colon (';').
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* An example from an HP 970C DeskJet printer is (this is one long string,
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* with the serial number changed):
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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: ;
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*/
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/*
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* USB Printer Requests
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*/
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#define USBLP_REQ_GET_ID 0x00
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#define USBLP_REQ_GET_STATUS 0x01
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#define USBLP_REQ_RESET 0x02
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#define USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST 0x00 /* HP Vendor-specific */
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#define USBLP_MINORS 16
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#define USBLP_MINOR_BASE 0
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#define USBLP_WRITE_TIMEOUT (5000) /* 5 seconds */
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#define USBLP_FIRST_PROTOCOL 1
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#define USBLP_LAST_PROTOCOL 3
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#define USBLP_MAX_PROTOCOLS (USBLP_LAST_PROTOCOL+1)
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/*
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* some arbitrary status buffer size;
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* need a status buffer that is allocated via kmalloc(), not on stack
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*/
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#define STATUS_BUF_SIZE 8
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struct usblp {
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struct usb_device *dev; /* USB device */
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struct semaphore sem; /* locks this struct, especially "dev" */
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char *writebuf; /* write transfer_buffer */
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char *readbuf; /* read transfer_buffer */
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char *statusbuf; /* status transfer_buffer */
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struct urb *readurb, *writeurb; /* The urbs */
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wait_queue_head_t wait; /* Zzzzz ... */
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int readcount; /* Counter for reads */
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int ifnum; /* Interface number */
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struct usb_interface *intf; /* The interface */
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/* Alternate-setting numbers and endpoints for each protocol
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* (7/1/{index=1,2,3}) that the device supports: */
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struct {
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int alt_setting;
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struct usb_endpoint_descriptor *epwrite;
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struct usb_endpoint_descriptor *epread;
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} protocol[USBLP_MAX_PROTOCOLS];
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int current_protocol;
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int minor; /* minor number of device */
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int wcomplete; /* writing is completed */
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int rcomplete; /* reading is completed */
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unsigned int quirks; /* quirks flags */
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unsigned char used; /* True if open */
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unsigned char present; /* True if not disconnected */
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unsigned char bidir; /* interface is bidirectional */
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unsigned char *device_id_string; /* IEEE 1284 DEVICE ID string (ptr) */
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/* first 2 bytes are (big-endian) length */
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};
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#ifdef DEBUG
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static void usblp_dump(struct usblp *usblp) {
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int p;
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dbg("usblp=0x%p", usblp);
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dbg("dev=0x%p", usblp->dev);
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dbg("present=%d", usblp->present);
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dbg("readbuf=0x%p", usblp->readbuf);
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dbg("writebuf=0x%p", usblp->writebuf);
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dbg("readurb=0x%p", usblp->readurb);
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dbg("writeurb=0x%p", usblp->writeurb);
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dbg("readcount=%d", usblp->readcount);
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dbg("ifnum=%d", usblp->ifnum);
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for (p = USBLP_FIRST_PROTOCOL; p <= USBLP_LAST_PROTOCOL; p++) {
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dbg("protocol[%d].alt_setting=%d", p, usblp->protocol[p].alt_setting);
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dbg("protocol[%d].epwrite=%p", p, usblp->protocol[p].epwrite);
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dbg("protocol[%d].epread=%p", p, usblp->protocol[p].epread);
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}
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dbg("current_protocol=%d", usblp->current_protocol);
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dbg("minor=%d", usblp->minor);
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dbg("wcomplete=%d", usblp->wcomplete);
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dbg("rcomplete=%d", usblp->rcomplete);
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dbg("quirks=%d", usblp->quirks);
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dbg("used=%d", usblp->used);
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dbg("bidir=%d", usblp->bidir);
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dbg("device_id_string=\"%s\"",
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usblp->device_id_string ?
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usblp->device_id_string + 2 :
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(unsigned char *)"(null)");
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}
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#endif
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/* Quirks: various printer quirks are handled by this table & its flags. */
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struct quirk_printer_struct {
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__u16 vendorId;
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__u16 productId;
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unsigned int quirks;
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};
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#define USBLP_QUIRK_BIDIR 0x1 /* reports bidir but requires unidirectional mode (no INs/reads) */
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#define USBLP_QUIRK_USB_INIT 0x2 /* needs vendor USB init string */
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static struct quirk_printer_struct quirk_printers[] = {
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{ 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
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{ 0x03f0, 0x0104, USBLP_QUIRK_BIDIR }, /* HP DeskJet 880C */
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{ 0x03f0, 0x0204, USBLP_QUIRK_BIDIR }, /* HP DeskJet 815C */
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{ 0x03f0, 0x0304, USBLP_QUIRK_BIDIR }, /* HP DeskJet 810C/812C */
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{ 0x03f0, 0x0404, USBLP_QUIRK_BIDIR }, /* HP DeskJet 830C */
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{ 0x03f0, 0x0504, USBLP_QUIRK_BIDIR }, /* HP DeskJet 885C */
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{ 0x03f0, 0x0604, USBLP_QUIRK_BIDIR }, /* HP DeskJet 840C */
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{ 0x03f0, 0x0804, USBLP_QUIRK_BIDIR }, /* HP DeskJet 816C */
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{ 0x03f0, 0x1104, USBLP_QUIRK_BIDIR }, /* HP Deskjet 959C */
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{ 0x0409, 0xefbe, USBLP_QUIRK_BIDIR }, /* NEC Picty900 (HP OEM) */
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{ 0x0409, 0xbef4, USBLP_QUIRK_BIDIR }, /* NEC Picty760 (HP OEM) */
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{ 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
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{ 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
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{ 0, 0 }
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};
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static int usblp_select_alts(struct usblp *usblp);
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static int usblp_set_protocol(struct usblp *usblp, int protocol);
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static int usblp_cache_device_id_string(struct usblp *usblp);
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/* forward reference to make our lives easier */
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static struct usb_driver usblp_driver;
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static DECLARE_MUTEX(usblp_sem); /* locks the existence of usblp's */
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/*
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* Functions for usblp control messages.
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*/
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static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value, void *buf, int len)
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{
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int retval;
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int index = usblp->ifnum;
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/* High byte has the interface index.
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Low byte has the alternate setting.
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*/
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if ((request == USBLP_REQ_GET_ID) && (type == USB_TYPE_CLASS)) {
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index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting;
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}
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retval = usb_control_msg(usblp->dev,
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dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0),
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request, type | dir | recip, value, index, buf, len, USBLP_WRITE_TIMEOUT);
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dbg("usblp_control_msg: rq: 0x%02x dir: %d recip: %d value: %d idx: %d len: %#x result: %d",
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request, !!dir, recip, value, index, len, retval);
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return retval < 0 ? retval : 0;
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}
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#define usblp_read_status(usblp, status)\
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usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, status, 1)
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#define usblp_get_id(usblp, config, id, maxlen)\
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usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, id, maxlen)
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#define usblp_reset(usblp)\
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usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
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#define usblp_hp_channel_change_request(usblp, channel, buffer) \
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usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_INTERFACE, channel, buffer, 1)
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/*
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* See the description for usblp_select_alts() below for the usage
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* explanation. Look into your /proc/bus/usb/devices and dmesg in
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* case of any trouble.
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*/
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static int proto_bias = -1;
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/*
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* URB callback.
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*/
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static void usblp_bulk_read(struct urb *urb, struct pt_regs *regs)
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{
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struct usblp *usblp = urb->context;
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if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
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return;
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if (unlikely(urb->status))
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warn("usblp%d: nonzero read/write bulk status received: %d",
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usblp->minor, urb->status);
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usblp->rcomplete = 1;
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wake_up_interruptible(&usblp->wait);
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}
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static void usblp_bulk_write(struct urb *urb, struct pt_regs *regs)
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{
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struct usblp *usblp = urb->context;
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if (!usblp || !usblp->dev || !usblp->used || !usblp->present)
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return;
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if (unlikely(urb->status))
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warn("usblp%d: nonzero read/write bulk status received: %d",
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usblp->minor, urb->status);
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usblp->wcomplete = 1;
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wake_up_interruptible(&usblp->wait);
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}
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/*
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* Get and print printer errors.
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*/
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static char *usblp_messages[] = { "ok", "out of paper", "off-line", "on fire" };
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static int usblp_check_status(struct usblp *usblp, int err)
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{
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unsigned char status, newerr = 0;
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int error;
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error = usblp_read_status (usblp, usblp->statusbuf);
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if (error < 0) {
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err("usblp%d: error %d reading printer status",
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usblp->minor, error);
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return 0;
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}
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status = *usblp->statusbuf;
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if (~status & LP_PERRORP)
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newerr = 3;
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if (status & LP_POUTPA)
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newerr = 1;
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if (~status & LP_PSELECD)
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newerr = 2;
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if (newerr != err)
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info("usblp%d: %s", usblp->minor, usblp_messages[newerr]);
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return newerr;
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}
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/*
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* File op functions.
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*/
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static int usblp_open(struct inode *inode, struct file *file)
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{
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int minor = iminor(inode);
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struct usblp *usblp;
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struct usb_interface *intf;
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int retval;
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if (minor < 0)
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return -ENODEV;
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down (&usblp_sem);
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retval = -ENODEV;
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intf = usb_find_interface(&usblp_driver, minor);
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if (!intf) {
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goto out;
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}
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usblp = usb_get_intfdata (intf);
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if (!usblp || !usblp->dev || !usblp->present)
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goto out;
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retval = -EBUSY;
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if (usblp->used)
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goto out;
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/*
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* TODO: need to implement LP_ABORTOPEN + O_NONBLOCK as in drivers/char/lp.c ???
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* This is #if 0-ed because we *don't* want to fail an open
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* just because the printer is off-line.
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*/
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#if 0
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if ((retval = usblp_check_status(usblp, 0))) {
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retval = retval > 1 ? -EIO : -ENOSPC;
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goto out;
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}
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#else
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retval = 0;
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#endif
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usblp->used = 1;
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file->private_data = usblp;
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usblp->writeurb->transfer_buffer_length = 0;
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usblp->wcomplete = 1; /* we begin writeable */
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usblp->rcomplete = 0;
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if (usblp->bidir) {
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usblp->readcount = 0;
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usblp->readurb->dev = usblp->dev;
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if (usb_submit_urb(usblp->readurb, GFP_KERNEL) < 0) {
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retval = -EIO;
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usblp->used = 0;
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file->private_data = NULL;
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}
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}
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out:
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up (&usblp_sem);
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return retval;
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}
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static void usblp_cleanup (struct usblp *usblp)
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{
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info("usblp%d: removed", usblp->minor);
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kfree (usblp->device_id_string);
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kfree (usblp->statusbuf);
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usb_free_urb(usblp->writeurb);
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usb_free_urb(usblp->readurb);
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kfree (usblp);
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}
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static void usblp_unlink_urbs(struct usblp *usblp)
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{
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usb_kill_urb(usblp->writeurb);
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if (usblp->bidir)
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usb_kill_urb(usblp->readurb);
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}
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static int usblp_release(struct inode *inode, struct file *file)
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{
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struct usblp *usblp = file->private_data;
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down (&usblp_sem);
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usblp->used = 0;
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if (usblp->present) {
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usblp_unlink_urbs(usblp);
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} else /* finish cleanup from disconnect */
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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");
|