Greg KH <greg@xxxxxxxxx>: > Use libudev to get this easily. sysfs shows this mapping, look in > /sys/dev/char/ for the links, or walk backward from the usb device > itself. esr@snark:~/software/gpsd$ lsusb Bus 001 Device 014: ID 0bb4:0c01 High Tech Computer Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 009: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub The PL2303 is /dev/ttyUSB1, I know because I can read from it. (/dev/ttyUSB0 is my Googlephone, first line of output.) esr@snark:~/software/gpsd$ ls /sys/dev/char/188\:1 dev device power subsystem uevent esr@snark:~/software/gpsd$ cat /sys/dev/char/188\:1/dev 188:1 esr@snark:~/software/gpsd$ ls /sys/dev/char/188\:1/device driver port_number power subsystem tty uevent esr@snark:~/software/gpsd$ ls /sys/dev/char/188\:1/device/tty ttyUSB1 OK, nice to have that confirmation. But I can't find anything under there that looks like 067b:2303, and even trying to list all the files hits a symlink loop. esr@snark:~/software/gpsd$ cat /sys/dev/char/188\:1/device/port_number 0 esr@snark:~/software/gpsd$ cat /sys/dev/char/188\:1/device/uevent DRIVER=pl2303 esr@snark:~/software/gpsd$ ls /sys/dev/char/188\:1/device/driver/ttyUSB1 driver port_number power subsystem tty uevent esr@snark:~/software/gpsd$ cat /sys/dev/char/188\:1/device/driver/new_id cat: /sys/dev/char/188:1/device/driver/new_id: Permission denied esr@snark:~/software/gpsd$ ls -l /sys/dev/char/188\:1/device/driver/new_id --w------- 1 root root 4096 2010-04-15 09:58 /sys/dev/char/188:1/device/driver/new_id Where's the vendor/product ID? -- <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a> "You have taught us much. Come with us and join the movement." "This movement of yours, does it have slogans?" inquired the Chink. "Right on!" they cried. And they quoted him some. "Your movement, does it have a flag?" asked the Chink. "You bet!" and they described their emblem. "And does your movement have leaders?" "Great leaders." "Then shove it up your butts," said the Chink. "I have taught you nothing." -- Tom Robbins, "Even Cowgirls Get The Blues" -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
