Linux打印机驱动源码分析.pdfVIP

E:\Downloads\linux-3.0.3\drivers\usb\class\usblp.c /* * usblp.c * * Copyright (c) 1999 Michael Gee michael@ * Copyright (c) 1999 Pavel Machek pavel@ucw.cz * Copyright (c) 2000 Randy Dunlap rdunlap@ * Copyright (c) 2000 Vojtech Pavlik vojtech@suse.cz # Copyright (c) 2001 Pete Zaitcev zaitcev@ # Copyright (c) 2001 David Paschal paschal@ * Copyright (c) 2006 Oliver Neukum oliver@ * * 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 (status 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, write to the Free So