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Linux打印机驱动源码分析.pdf18页

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E:\Downloads\linux-3.0.3\drivers\usb\class\usblp.c

/*

* usblp.c

*

* Copyright (c) 1999 Michael Gee

* Copyright (c) 1999 Pavel Machek

* Copyright (c) 2000 Randy Dunlap

* Copyright (c) 2000 Vojtech Pavlik

# Copyright (c) 2001 Pete Zaitcev

# Copyright (c) 2001 David Paschal

* Copyright (c) 2006 Oliver Neukum

*

* 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@)

* v0.11 - add proto_bias option (Pete Zaitcev)

* v0.12 - add ioctls (David Paschal)

* v0.13 - alloc space for statusbuf ( not on stack);

* use usb_alloc_coherent() for read buf & write buf;

* none - Maintained in Linux kernel after v0.13

*/

/*

* 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, wri

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