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Diffstat (limited to 'Documentation/usb/gadget-testing.txt')
| -rw-r--r-- | Documentation/usb/gadget-testing.txt | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/usb/gadget-testing.txt b/Documentation/usb/gadget-testing.txt index 076ac7ba7f93..f45b2bf4b41d 100644 --- a/Documentation/usb/gadget-testing.txt +++ b/Documentation/usb/gadget-testing.txt @@ -19,6 +19,7 @@ provided by gadgets. 16. UAC1 function 17. UAC2 function 18. UVC function +19. PRINTER function 1. ACM function @@ -726,3 +727,49 @@ with these patches: http://www.spinics.net/lists/linux-usb/msg99220.html host: luvcview -f yuv + +19. PRINTER function +==================== + +The function is provided by usb_f_printer.ko module. + +Function-specific configfs interface +------------------------------------ + +The function name to use when creating the function directory is "printer". +The printer function provides these attributes in its function directory: + + pnp_string - Data to be passed to the host in pnp string + q_len - Number of requests per endpoint + +Testing the PRINTER function +---------------------------- + +The most basic testing: + +device: run the gadget +# ls -l /devices/virtual/usb_printer_gadget/ + +should show g_printer<number>. + +If udev is active, then /dev/g_printer<number> should appear automatically. + +host: + +If udev is active, then e.g. /dev/usb/lp0 should appear. + +host->device transmission: + +device: +# cat /dev/g_printer<number> +host: +# cat > /dev/usb/lp0 + +device->host transmission: + +# cat > /dev/g_printer<number> +host: +# cat /dev/usb/lp0 + +More advanced testing can be done with the prn_example +described in Documentation/usb/gadget-printer.txt. |