Hello, I'm trying to setup a custom mouse-like device on a pi zero.
As I have never been using the USB gadget stack before, the following problem might likely be a configuration failure on my side as well as a driver issue. Using the documentation from kernel source (Documentation/usb/gadget_hid.txt, Documentation/usb/gadget_configfs.txt and Documentation/ABI/testing/configfs-usb-gadget-hid) it was more or less straight forward to set up a keyboard emulating device using the provided example code (hid_gadget_test). Unfortunately this is not the case with the mouse emulation. I build the following shell-script to generate a mouse device. Due to the lack of an example "report_desc" has been stolen from a logitech mouse: --cut-- #!/bin/bash CONFIGFS_HOME=/sys/kernel/config C=1 N="usb0" cd $CONFIGFS_HOME/usb_gadget/ mkdir g1 cd g1 echo 0x1d6b > idVendor # Linux Foundation echo 0x0104 > idProduct # Multifunction Composite Gadget echo 0x0100 > bcdDevice # v1.0.0 echo 0x0200 > bcdUSB # USB2 mkdir -p strings/0x409 echo "fedcba9876543210" > strings/0x409/serialnumber echo "Sirius Cybernetics Corp." > strings/0x409/manufacturer echo "dummymouse" > strings/0x409/product mkdir -p functions/hid.$N # protocol 2 seems to be mouse echo 2 > functions/hid.$N/protocol echo 1 > functions/hid.$N/subclass echo 8 > functions/hid.$N/report_length # HID Mouse e.g. copy from logitech mouse as follows: # for i in $(usbhid-dump -a XXX:YYY |tail -n +2); do echo -n \\\\x$i; done |tr '[:upper:]' '[:lower:]' echo -ne \\x05\\x01\\x09\\x02\\xa1\\x01\\x09\\x01\\xa1\\x00\\x05\\x09\\x19\\x01\\x29\\x08\\x15\\x00\\x25\\x01\\x75\\x01\\x95\\x08\\x81\\x02\\x05\\x01\\x16\\x01\\xf8\\x26\\xff\\x07\\x75\\x0c\\x95\\x02\\x09\\x30\\x09\\x31\\x81\\x06\\x15\\x81\\x25\\x7f\\x75\\x08\\x95\\x01\\x09\\x38\\x81\\x06\\x05\\x0c\\x0a\\x38\\x02\\x95\\x01\\x81\\x06\\xc0\\xc0 > functions/hid.$N/report_desc hexdump -C functions/hid.$N/report_desc mkdir -p configs/c.$C/strings/0x409 echo "Config $C: dummymouse" > configs/c.$C/strings/0x409/configuration echo 250 > configs/c.$C/MaxPower ln -s functions/hid.$N configs/c.$C/ ls /sys/class/udc > UDC --cut-- However, this does not work. First of all, the report_desc is not written to functions/hid.$N/report_desc as expected. Instead I get the following truncated stuff which also shows up on the usb host using usbhid-dump: 00000000 38 02 95 01 81 06 c0 c0 |8.......| 00000008 Thus I enabled debugging on USB hid gadget driver and get the following: [12381.564157] configfs-gadget gadget: high-speed config #1: c [12381.577963] <intr> configfs-gadget gadget: hidg_set_alt intf:0 alt:0 [12381.593012] <intr> configfs-gadget gadget: non-core control req21.0a v0000 i0000 l0 [12381.608761] <intr> configfs-gadget gadget: hidg_setup crtl_request : bRequestType:0x21 bRequest:0xa Value:0x0 [12381.626650] <intr> configfs-gadget gadget: Unknown request 0xa [12381.640731] <intr> configfs-gadget gadget: non-core control req81.06 v2200 i0000 l8 [12381.656464] <intr> configfs-gadget gadget: hidg_setup crtl_request : bRequestType:0x81 bRequest:0x6 Value:0x2200 [12381.674655] <intr> configfs-gadget gadget: USB_REQ_GET_DESCRIPTOR: REPORT As a result, the device in not detected correctly on the host side as well: usb 2-1: Product: dummymouse usb 2-1: Manufacturer: Sirius Cybernetics Corp. usb 2-1: SerialNumber: fedcba9876543210 hid-generic 0003:1D6B:0104.004F: unknown main item tag 0x0 hid-generic 0003:1D6B:0104.004F: collection stack underflow hid-generic 0003:1D6B:0104.004F: item 0 0 0 12 parsing failed hid-generic: probe of 0003:1D6B:0104.004F failed with error -22 Kernel Version is 4.4.35+ from Raspberr Pi repo, but looking at the current version of drivers/usb/gadget/function/f_hid.c did not seem to have changes related to thsi topic: https://github.com/raspberrypi/linux/blob/rpi-4.4.y/drivers/usb/gadget/function/f_hid.c Any hint? Regards Sven -- "Remember, democracy never lasts long. It soon wastes itself, exhausts and murders itself. There never was a democracy yet that did not commit suicide." (John Quincy Adams) /me is giggls@ircnet, http://sven.gegg.us/ on the Web -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
