Messages in this thread | | | From | Alexander Puchmayr <> | Subject | USB-Printer status flags question | Date | Sun, 12 Jan 2003 11:17:41 +0100 |
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After looking at cups (1.1.18) backend/usb.c and the kernel's (2.4.19-gentoo-r10) drivers/usb/printer.c I've found some different interpretations of the LP_* flags from linux/lp.h
While the kernel seems to use the 8255 status port definitions, which use (amongst others) the flags,
#define LP_PSELECD 0x10 /* unchanged input, active high */ #define LP_PERRORP 0x08 /* unchanged input, active low */
the same bits are defined by POSIX guidelines a few lines above in linux/lp.h:
#define LP_OFFL 0x0008 #define LP_NOPA 0x0010
Obviously, this leads the cups usb-backend to incorrectly report an empty media tray when the printer is online, idle and has enough paper.
This doesn't seem to be something serious, its just a wrong message in cups log-file.
Greetings Alex
PS: Since two different specifications are mixed up, this problem could also be a kernel problem. -- Alexander Puchmayr Systemadministrator for Theoretical Physics University Linz, Austria e-mail: alexander.puchmayr@jku.at Altenbergerstrasse 69 phone: +43/732/2468-8633 A-4040 Linz-Auhof FAX: +43/732/2468-8585
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