On Mon, 7 Jan 2013, victor yeo wrote: > Yes, usbmon requires usb host side support (i enable them both to use > usbmon). So i disable the usbmon and usb host side support in > menuconfig. Then i rebuild linux again. Subsequently, the /sys/bus > does not contain usb folder. > > # ls /sys/bus/ > clocksource cpu mmc platform sdio spi For testing purposes, you probably should use a Linux host. Then you could use usbmon on the host to see what's happening, and there would be more debugging options available. > > Did you enable the two debugging options in file_storage.c? And did > > you remember to enable CONFIG_USB_GADGET_DEBUG in the kernel > > configuration? What shows up in the dmesg log? > > Yes, i enable the CONFIG_USB_GADGET_DEBUG and the VERBOSE_DEBUG and > DUMP_MSGS in file_storage.c. In dmesg log, there are lot of entries > recorded during usb gadget enumeration with host PC. After gadget > receives "get MAX LUN", the enumeration process gets repeated. Is this > the problem?? Please see the dmesg log below. This log looks oddly incomplete. A lot of debugging messages are missing. > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 00 01 00 00 40 00 > g_file_storage gadget: get device descriptor For example, right here we should see the device descriptor data that was sent back to the host. > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 00 01 00 00 12 00 > g_file_storage gadget: get device descriptor > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 00 02 00 00 ff 00 > g_file_storage gadget: get configuration descriptor > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 00 03 00 00 ff 00 > g_file_storage gadget: get string descriptor > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 02 03 09 04 ff 00 > g_file_storage gadget: get string descriptor > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 00 06 00 00 0a 00 > g_file_storage gadget: get device qualifier > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 00 01 00 00 12 00 > g_file_storage gadget: get device descriptor > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 00 02 00 00 09 00 > g_file_storage gadget: get configuration descriptor > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 00 02 00 00 20 00 > g_file_storage gadget: get configuration descriptor > > g_file_storage gadget: ep0-setup, length 8: > 00000000: 00 09 01 00 00 00 00 00 > g_file_storage gadget: set configuration > g_file_storage gadget: set interface 0 > g_file_storage gadget: high-speed config #1 > > g_file_storage gadget: ep0-setup, length 8: > 00000000: a1 fe 00 00 00 00 01 00 > g_file_storage gadget: get max LUN > > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 01 03 09 04 ff 00 > g_file_storage gadget: get string descriptor > > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 04 03 09 04 ff 00 > g_file_storage gadget: get string descriptor > > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 05 03 09 04 ff 00 > g_file_storage gadget: get string descriptor > > g_file_storage gadget: ep0-setup, length 8: > 00000000: 80 06 00 01 00 00 40 00 > g_file_storage gadget: get device descriptor > ......... Where does the enumeration repeat? I don't see any repeats here, aside from the fact that Windows asks for the same device and config descriptors a few times. Alan Stern -- 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
