基于ARM的cups移植，lpinfo -v 为什么没有显示我的USB打印机URI ?
本帖最后由 xylinux6 于 2015-04-28 18:00 编辑大家好！:lol: 我在已经把cups-1.2.12移植到了ARM上并成功启动了cupsd服务。使用 lpinfo -l -v 命令显示可用的设备时发现USB连接的打印机怎么像是挂在了并口上？而在Ubuntu14.04上运行 lpinfo -l -v 则正常。
下边是在ARM上运行 lpinfo -l -v 的结果：# lpinfo -l -v
Device: uri = socket
class = network
info = AppSocket/HP JetDirect
make-and-model = Unknown
device-id =
Device: uri = parallel:/dev/lp0
class = direct
info = HP Deskjet 1000 J110 series LPT #1
make-and-model = HP Deskjet 1000 J110 series
device-id = MFG:HP;MDL:Deskjet 1000 J110 series;CMD:PCL,DW-PCL,DESKJET,DYN;CLS:PRINTER;DES:CH340D;CID:HPIJVIPAV1;LEDMDIS:USB#07#01#02,USB#FF#04#01;SN:CN36L18RBD05YD;S:038000C484001021002c1f01100c2881028;J: ;Z:0102,050361a700b228,0600,0c0,0e00000000,0f00000000,10000008000008,12000,143,150,16361a361a000116da189c0001,17000000000000;
Device: uri = http
class = network
info = Internet Printing Protocol (http)
make-and-model = Unknown
device-id =
Device: uri = ipp
class = network
info = Internet Printing Protocol (ipp)
make-and-model = Unknown
device-id =
Device: uri = lpd
class = network
info = LPD/LPR Host or Printer
make-and-model = Unknown
device-id =
Device: uri = scsi
class = direct
info = SCSI Printer
make-and-model = Unknown
device-id =
Device: uri = serial:/dev/ttyS0?baud=115200
class = serial
info = Serial Port #1
make-and-model = Unknown
device-id =
Device: uri = serial:/dev/ttyS1?baud=115200
class = serial
info = Serial Port #2
make-and-model = Unknown
device-id =
Device: uri = serial:/dev/ttyS2?baud=115200
class = serial
info = Serial Port #3
make-and-model = Unknown
device-id =
Device: uri = serial:/dev/ttyS3?baud=115200
class = serial
info = Serial Port #4
make-and-model = Unknown
device-id = 在Ubuntu14.04上运行 lpinfo -l -v 的结果：root@ubuntu:/home/xylinux/0001/cups-1.2.12/cups# lpinfo -l -v
Device: uri = socket
class = network
info = AppSocket/HP JetDirect
make-and-model = Unknown
device-id =
Device: uri = usb://HP/Deskjet%201000%20J110%20series?serial=CN36L18RBD05YD
class = direct
info = HP Deskjet 1000 J110 series USB #1
make-and-model = HP Deskjet 1000 J110 series
device-id = MFG:HP;MDL:Deskjet 1000 J110 series;CMD:PCL,DW-PCL,DESKJET,DYN;CLS:PRINTER;DES:CH340D;CID:HPIJVIPAV1;LEDMDIS:USB#07#01#02,USB#FF#04#01;SN:CN36L18RBD05YD;S:038000C484001021002c1f01100c2881028;J: ;Z:0102,050361a700b228,0600,0c0,0e00000000,0f00000000,10000008000008,12000,143,150,16361a361a000116da189c0001,17000000000000;
Device: uri = http
class = network
info = Internet Printing Protocol (http)
make-and-model = Unknown
device-id =
Device: uri = ipp
class = network
info = Internet Printing Protocol (ipp)
make-and-model = Unknown
device-id =
Device: uri = lpd
class = network
info = LPD/LPR Host or Printer
make-and-model = Unknown
device-id =
Device: uri = parallel:/dev/lp0
class = direct
info = LPT #1
make-and-model = Unknown
device-id =
Device: uri = scsi
class = direct
info = SCSI Printer
make-and-model = Unknown
device-id =
因添加打印机需要它连接的URI，为什么我的USB打印机在ARM上”像是“挂在了并口上？怎么能让它正确地挂在USB上呢？
谢谢。 本帖最后由 xylinux6 于 2015-05-07 11:47 编辑
已解决。
导致我这个问题的原因在于：usblp模块没有加载进内核中。
解决步骤如下：
1.lsmod//发现内核没有加载上usblp模块2. 手动加载内核模块modprobe -a usblp//如若提示找不到模块，则需重新编译内核。重新编译后，加载成功3. 但 lpinfo -v 命令仍然无法发现usb打印机，ls -l /dev/usblp0//发现输出信息的第一列首字母不是c（字符设备）解决方法：进入到/dev/下，
a.rm usblp0//删除节点b.mknod usblp0 c 180 0//手动新建节点，'c'表示字符设备，180表示major number， 0表示minor number。（这两个数字尚不清楚，见谅）c.chmod 744 usblp0//cups需要对usblp0文件具有可执行权限4. 对我来说，以上步骤解决了我的问题。
/*
希望我的经历能够帮到其他人，谢谢。
*/
遇到相同问题，/dev/lp0创建，backend 的parrllel能发现设备，usb不行，一直找不到问题，usblp0查看加载模块的时候的确没有，但dmesg能看到影子，菜鸟，刚学，不知道原因，modprobe usblp 也不能创建，看来得重新编译内核了。多谢你的文章，有联系方式吗？加qq：38350771 不客气，希望对你能有所帮助。回复 3# topo
你好。我也是做了嵌入式linux系统，是用的Ramdisk的。我现在是要连接打印机，不知道怎么处理cups，还有开机启动cups服务。方便价格QQ或者什么交流下吗？
回复 1# xylinux6
本帖最后由 xylinux6 于 2015-10-29 15:04 编辑
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