Hi, all, I have a raspberry pi zero w board and I'm currently configuring the device as USB gadget and connects it to PC. I'm using configfs/functionfs to send a vendor specific interface with single buik in and bulk out endpoint each. When I unplug the USB cable, there is no DISABLE event generated on ep0 until next time the cable is re-plugged in again, right before the next ENABLE event. Obviously this is not very useful as I really need to know exactly when a unpllugging is happening. You can see a debugging trace below. After looking around, I finally got it working by the attached patch. However, I have very little confidence in the patch itself. Would appreciate any feedback on the issue and the correct fix. Cheers. Jun <unplug USB> <replug USB> [ 130.406932] ffs_epfile_io_complete() [ 130.406964] ====== JSUN ====== ffs_func_disable() called [ 130.406980] __ffs_event_add(DISABLE) [ 130.406991] adding event 3 [ 130.435178] ffs_epfile_release() [ 130.435193] ffs_data_closed() [ 130.435199] ffs_data_put() [ 130.435325] ffs_epfile_release() [ 130.435333] ffs_data_closed() [ 130.435338] ffs_data_put() [ 130.435758] ffs_ep0_read() [ 130.461705] dwc2 20980000.usb: new device is high-speed [ 130.554583] dwc2 20980000.usb: new device is high-speed [ 130.591376] dwc2 20980000.usb: new address 17 [ 130.827451] dwc2 20980000.usb: new device is high-speed [ 130.918627] dwc2 20980000.usb: new device is high-speed [ 130.962062] dwc2 20980000.usb: new address 18 [ 131.152381] dwc2 20980000.usb: new device is high-speed [ 131.243481] dwc2 20980000.usb: new device is high-speed [ 131.285993] dwc2 20980000.usb: new address 19 [ 131.461014] configfs-gadget gadget: high-speed config #1: c [ 131.461057] __ffs_event_add(ENABLE) [ 131.461066] adding event 2 [ 131.464892] ffs_epfile_open() [ 131.464908] ffs_data_opened() [ 131.465261] ffs_epfile_open() [ 131.465272] ffs_data_opened() [ 131.488760] ffs_epfile_read_iter() [ 131.488835] ffs_ep0_read() <unplug USB> <replug USB> [ 151.214987] ffs_epfile_io_complete() [ 151.215020] ====== JSUN ====== ffs_func_disable() called [ 151.215038] __ffs_event_add(DISABLE) [ 151.215048] adding event 3 [ 151.246561] ffs_epfile_release() [ 151.246577] ffs_data_closed() [ 151.246583] ffs_data_put() [ 151.247797] ffs_epfile_release() [ 151.247811] ffs_data_closed() [ 151.247817] ffs_data_put() [ 151.248227] ffs_ep0_read() [ 151.269764] dwc2 20980000.usb: new device is high-speed [ 151.363232] dwc2 20980000.usb: new device is high-speed [ 151.400091] dwc2 20980000.usb: new address 20 [ 151.638217] dwc2 20980000.usb: new device is high-speed [ 151.729145] dwc2 20980000.usb: new device is high-speed [ 151.773919] dwc2 20980000.usb: new address 21 [ 151.962998] dwc2 20980000.usb: new device is high-speed [ 152.054036] dwc2 20980000.usb: new device is high-speed [ 152.096922] dwc2 20980000.usb: new address 22 [ 152.267818] configfs-gadget gadget: high-speed config #1: c [ 152.267863] __ffs_event_add(ENABLE) [ 152.267874] adding event 2 [ 152.273430] ffs_epfile_open() [ 152.273446] ffs_data_opened() [ 152.273811] ffs_epfile_open() [ 152.273822] ffs_dat[ 152.296847] ffs_epfile_read_iter() [ 152.296921] ffs_ep0_read() [ 251.986224] random: crng init done
Attachment:
00-usb-disconnect.patch
Description: Binary data
