riskable Posted December 16, 2016 Posted December 16, 2016 I can't seem to get the Orange Pi Zero working as a USB gadget (libcomposite) to emulate a keyboard. Here's the script I'm using to test: #!/bin/bash cd /sys/kernel/config/usb_gadget mkdir g1 cd g1 echo "0x1d6b" > idVendor echo "0x0104" > idProduct mkdir strings/0x409 echo "1234567890" > strings/0x409/serialnumber echo "0x1d6b" > strings/0x409/manufacturer echo "0x0104" > strings/0x409/product mkdir functions/hid.usb0 echo 1 > functions/hid.usb0/protocol echo 1 > functions/hid.usb0/subclass echo 8 > functions/hid.usb0/report_length /bin/echo -ne \\x05\\x01\\x09\\x06\\xa1\\x01\\x05\\x07\\x19\\xe0\\x29\\xe7\\x15\\x00\\x25\\x01\\x75\\x01\\x95\\x08\\x81\\x02\\x95\\x01\\x75\\x08\\x81\\x03\\x95\\x05\\x75\\x01\\x05\\x08\\x19\\x01\\x29\\x05\\x91\\x02\\x95\\x01\\x75\\x03\\x91\\x03\\x95\\x06\\x75\\x08\\x15\\ x00\\x25\\x65\\x05\\x07\\x19\\x00\\x29\\x65\\x81\\x00\\xc0 > functions/hid.usb0/report_desc mkdir configs/c.1 mkdir configs/c.1/strings/0x409 echo Conf 1 > configs/c.1/strings/0x409/configuration echo 120 > configs/c.1/MaxPower ln -s functions/hid.usb0 configs/c.1 echo musb-hdrc.1.auto > UDC When trying to execute the script I get this crash: root@orangepizero:/usr/local/bin# bash -x hid_testing.sh + modprobe libcomposite + cd /sys/kernel/config/usb_gadget/ + mkdir -p g1 + cd g1 + echo 0x1d6b + echo 0x0104 + echo 0x0100 + echo 0x0200 + mkdir -p strings/0x409 + echo fedcba9876543210 + echo girst + echo Hardpass + N=usb0 + mkdir -p functions/hid.usb0 + echo 1 + echo 1 + echo 8 + echo -ne '\x05\x01\x09\x06\xa1\x01\x05\x07\x19\xe0\x29\xe7\x15\x00\x25\x01\x75\x01\x95\x08\x81\x02\x95\x01\x75\x08\x81\x03\x95\x05\x75\x01\x05\x08\x19\x01\x29\x05\x91\x02\x95\x01\x[ 84.870357] Unable to handle kernel NULL pointer dereference at virtual address 000000 02 75\x03\x91\x03\x95\x06\x75\x08\x15\x00\x25\x65\x05\x07\x19\x00\x[ 84.879054] pgd = ce2b8000 29\x65\x81\x00\xc0' + C=1 + mkdir -p configs/c.1/strings/0x409[ 84.887248] [00000002] *pgd=4e2c9835 + echo 'Config 1: ECM network' + echo 250 + ln -s functions/, *pte=00000000hid.usb0 configs/c.1/ + ls /sys/class/udc , *ppte=00000000 [ 84.908434] Internal error: Oops: 17 [#1] SMP THUMB2 [ 84.913394] Modules linked in: usb_f_hid libcomposite evdev sun8i_ths gpio_keys cpufreq_dt uio_pdrv_genirq uio thermal_sys [ 84.924552] CPU: 3 PID: 1208 Comm: ls Not tainted 4.9.0-sun8i #14 [ 84.930639] Hardware name: Allwinner sun8i Family [ 84.935339] task: ce1bb900 task.stack: ce26e000 [ 84.939914] PC is at alloc_ep_req+0x15/0x50 [libcomposite] [ 84.945396] LR is at kmem_cache_alloc+0xe3/0xf0 [ 84.949923] pc : [<bf84ad76>] lr : [<c01c1cb7>] psr: 200e0033 [ 84.949923] sp : ce26fde8 ip : 00000000 fp : c9d8e1ec [ 84.961388] r10: c9c61e94 r9 : cd402ac4 r8 : cd402b1c [ 84.966608] r7 : cd402aa8 r6 : ce0a2418 r5 : ce178480 r4 : 00000008 [ 84.973128] r3 : 00000000 r2 : ffffffff r1 : 00000000 r0 : ce178480 [ 84.979651] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA Thumb Segment none [ 84.986953] Control: 50c5387d Table: 4e2b806a DAC: 00000051 [ 84.992693] Process ls (pid: 1208, stack limit = 0xce26e210) [ 84.998347] Stack: (0xce26fde8 to 0xce270000) [ 85.002703] fde0: bf8570a4 00000000 c9c61e94 bf856461 c0b48ba8 cdbd9000 [ 85.010874] fe00: c9d8e1ec bf847923 c9c61e94 cd402aa8 cd402aa8 00000000 cd402b1c bf84778b [ 85.019046] fe20: cd402b1c c9c61eec 00000200 cd402aa8 00000100 bf84a4b9 00000055 c9d8e000 [ 85.027235] fe40: c9d8e260 ce0a3148 bf84c100 c9d8e298 00000000 cd220200 00000000 c9d8e1ec [ 85.035419] fe60: cd1b06c0 c9d8e1ec c0b48ba8 cdbd9000 00000051 c05429c3 cd220200 00000000 [ 85.043603] fe80: c0b48bc0 c0542ca1 00000000 cd1b06c0 fffffff0 c9d8e000 c9d8e190 00000011 [ 85.051792] fea0: cdadc180 bf84ab99 00037e98 00000000 00000011 cd4278c0 00000011 cd4278d8 [ 85.059982] fec0: ce26ff80 c021de13 ce26ff80 cdadc180 c021dd81 c0712138 ce26ff80 00037e98 [ 85.068172] fee0: 00000011 00000000 00000000 c01cf3f7 50c5387d ce26ffb0 c0b08f2c 000001ff [ 85.076361] ff00: b6f2f120 c010121b 00000000 00000000 585423be 2aedab11 585423be 2aedab11 [ 85.084551] ff20: 585423be 2aedab11 00003077 00000000 bec70370 b6f4bd58 cdadc180 00000011 [ 85.092740] ff40: 00037e98 ce26ff80 00037e98 00000000 00000000 c01cfe5f 0000000e 000081a4 [ 85.100929] ff60: 00000001 cdadc180 cdadc180 00000000 00000000 00037e98 00000011 c01d09df [ 85.109118] ff80: 00000000 00000000 585423be 00000011 00037e98 b6f4bd58 00000004 c0105fe4 [ 85.117307] ffa0: ce26e000 c0105e21 00000011 00037e98 00000001 00037e98 00000011 00000000 [ 85.125496] ffc0: 00000011 00037e98 b6f4bd58 00000004 b6f4c0ac 00000001 b6f9c000 00000000 [ 85.133686] ffe0: 00000000 bec72ae4 b6eaf79b b6eeaf96 000e0030 00000001 4eff6861 4eff6c61 [ 85.141926] [<bf84ad76>] (alloc_ep_req [libcomposite]) from [<bf856461>] (hidg_bind+0x64/0x1d0 [usb_f_hid]) [ 85.151699] [<bf856461>] (hidg_bind [usb_f_hid]) from [<bf84778b>] (usb_add_function+0x3a/0xc4 [libcomposite]) [ 85.161740] [<bf84778b>] (usb_add_function [libcomposite]) from [<bf84a4b9>] (configfs_composite_bind+0x1cc/0x2d8 [libcomposite]) [ 85.173421] [<bf84a4b9>] (configfs_composite_bind [libcomposite]) from [<c05429c3>] (udc_bind_to_driver+0x1b/0x74) [ 85.183785] [<c05429c3>] (udc_bind_to_driver) from [<c0542ca1>] (usb_gadget_probe_driver+0xa1/0xe4) [ 85.192859] [<c0542ca1>] (usb_gadget_probe_driver) from [<bf84ab99>] (gadget_dev_desc_UDC_store+0x80/0x94 [libcomposite]) [ 85.203845] [<bf84ab99>] (gadget_dev_desc_UDC_store [libcomposite]) from [<c021de13>] (configfs_write_file+0x93/0xec) [ 85.214469] [<c021de13>] (configfs_write_file) from [<c01cf3f7>] (__vfs_write+0xf/0xb4) [ 85.222487] [<c01cf3f7>] (__vfs_write) from [<c01cfe5f>] (vfs_write+0x6f/0x13c) [ 85.229811] [<c01cfe5f>] (vfs_write) from [<c01d09df>] (SyS_write+0x2b/0x64) [ 85.236871] [<c01d09df>] (SyS_write) from [<c0105e21>] (ret_fast_syscall+0x1/0x4c) [ 85.244456] Code: d0d8 4605 b190 6a73 (f993) 2002 [ 85.249310] ---[ end trace 5a400d152710de10 ]--- hid_testing.sh: line 27: 1208 Segmentation fault ls /sys/class/udc > UDC Apparently this line is what kicks it off: ls /sys/class/udc > UDC Running this command you can see that it should simply output "musb-hdrc.1.auto" to the "UDC" file: root@orangepizero:/usr/local/bin# ls /sys/class/udc musb-hdrc.1.auto Sending that to the UDC file is basically the final step in initializing a USB gadget. So something in the USB gadget driver is failing to work properly and I haven't the foggiest idea of how to troubleshoot this further. It *seems* like it's a bug but I could be doing something wrong. Any assistance is appreciated.
hiroshi Posted January 21, 2017 Posted January 21, 2017 The latest beta kernel and device tree blobs as of today still have this problem. Ideas anyone? root@orangepizero:/usr/local/bin# dpkg -l | grep -i "linux-image-dev-sun8i\|linux-dtb-dev-sun8i" ii linux-dtb-dev-sun8i 5.24.170121 armhf Linux DTB, version 4.9.4-sun8i ii linux-image-dev-sun8i 5.24.170121 armhf Linux kernel, version 4.9.4-sun8i root@orangepizero:/usr/local/bin# uname -a Linux orangepizero 4.9.4-sun8i #2 SMP Fri Jan 20 10:22:01 CET 2017 armv7l armv7l armv7l GNU/Linux root@orangepizero:/usr/local/bin# cat /proc/device-tree/model; echo Xunlong Orange Pi Zero root@orangepizero:/usr/local/bin# bash -x hid_testing.sh + cd /sys/kernel/config/usb_gadget + mkdir g1 + cd g1 + echo 0x1d6b + echo 0x0104 + mkdir strings/0x409 + echo 1234567890 + echo 0x1d6b + echo 0x0104 + mkdir functions/hid.usb0 + echo 1 + echo 1 + echo 8 + /bin/echo -ne '\x05\x01\x09\x06\xa1\x01\x05\x07\x19\xe0\x29\xe7\x15\x00\x25\x01\x75\x01\x95\x08\x81\x02\x95\x01\x75\x08\x81\x03\x95\x05\x75\x01\x05\x08\x19\x01\x29\x05\x91\x02\x95\x01\x75\x03\x91\x03\x95\x06\x75\x08\x15\x00\x25\x65\x05\x07\x19\x00\x29\x65\x81\x00\xc0' + mkdir configs/c.1 + mkdir configs/c.1/strings/0x409 + echo Conf 1 + echo 120 + ln -s functions/hid.usb0 configs/c.1 + echo musb-hdrc.1.auto Segmentation fault root@orangepizero:/usr/local/bin# dmesg [SNIP] [ 58.756380] Unable to handle kernel NULL pointer dereference at virtual address 00000002 [ 58.765376] pgd = cdb44000 [ 58.768237] [00000002] *pgd=4d891835, *pte=00000000, *ppte=00000000 [ 58.775106] Internal error: Oops: 17 [#1] SMP THUMB2 [ 58.780210] Modules linked in: usb_f_hid evdev xradio_wlan mac80211 cfg80211 rfkill sun8i_ths gpio_keys uio_pdrv_genirq cpufreq_dt uio thermal_sys libcomposite [ 58.795335] CPU: 0 PID: 1000 Comm: bash Not tainted 4.9.4-sun8i #2 [ 58.801660] Hardware name: Allwinner sun8i Family [ 58.806508] task: ce142ac0 task.stack: cd9ee000 [ 58.811426] PC is at alloc_ep_req+0x15/0x50 [libcomposite] [ 58.817101] LR is at kmem_cache_alloc+0xe5/0xec [ 58.821792] pc : [<bf803e06>] lr : [<c01c2aad>] psr: 200e0033 sp : cd9efdf0 ip : 00000000 fp : cda86298 [ 58.833519] r10: c9c734c4 r9 : ceb77cec r8 : 00000100 [ 58.838890] r7 : c9c734a8 r6 : cd244418 r5 : cda3e900 r4 : 00000008 [ 58.845568] r3 : 00000000 r2 : ffffffff r1 : 00000000 r0 : cda3e900 [ 58.852254] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA Thumb Segment none [ 58.859784] Control: 50c5387d Table: 4db4406a DAC: 00000051 [ 58.865679] Process bash (pid: 1000, stack limit = 0xcd9ee210) [ 58.871661] Stack: (0xcd9efdf0 to 0xcd9f0000) [ 58.876179] fde0: bf9200c0 ceb77c94 00000000 bf91f47d [ 58.884617] fe00: c9c73524 cdbbf840 cda861ec bf80090f ceb77c94 c9c734a8 00000200 00000000 [ 58.893055] fe20: 00000100 bf800773 c9c7351c ceb77c94 c9c734a8 00000200 c9c7351c bf803541 [ 58.901491] fe40: cda86000 cda86260 00000000 cd245148 bf805180 cda861ec d0e30270 cd23ac00 [ 58.909926] fe60: c0b48f60 cda861ec cda861ec c0b48f48 cdbbf840 cda26000 00000051 c054e6e3 [ 58.918362] fe80: cd23ac00 c0b48f60 cd41d940 c054e9bb cd41d940 cda86000 cda86190 fffffff0 [ 58.926796] fea0: 00000011 bf803c3b 000cd408 00000000 00000011 cd41d040 000cd408 cd41d058 [ 58.935233] fec0: cd9eff80 c021e91d cd9eff80 cdbbf840 c021e88d c07121f8 cd9eff80 00000000 [ 58.943667] fee0: 00000011 00000000 000c475c c01d032f cc28b700 00000301 00000000 0000034e [ 58.952099] ff00: 00000000 00000000 00000000 cd9eff10 cd9efefc 00000001 cd20f300 00000000 [ 58.960532] ff20: 0000000a 00000100 cdaddf00 cdad0bc0 0000000a c01e5a11 cdbbf840 00000011 [ 58.968966] ff40: 000cd408 cd9eff80 00000000 00000000 000c475c c01d0d95 cd9b0a80 00000000 [ 58.977400] ff60: 00000002 cdbbf840 cdbbf840 00000000 00000000 000cd408 00000011 c01d1937 [ 58.985834] ff80: 00000000 00000000 ce142ac0 00000011 000cd408 b6f70d58 00000004 c0106024 [ 58.994268] ffa0: cd9ee000 c0105e61 00000011 000cd408 00000001 000cd408 00000011 00000000 [ 59.002702] ffc0: 00000011 000cd408 b6f70d58 00000004 00000000 000aa538 000c715c 000c475c [ 59.011135] ffe0: 00000000 bee220ec b6ed479b b6f0ff96 000e0030 00000001 00000000 00000000 [ 59.019800] [<bf803e06>] (alloc_ep_req [libcomposite]) from [<bf91f47d>] (hidg_bind+0x68/0x1c8 [usb_f_hid]) [ 59.030017] [<bf91f47d>] (hidg_bind [usb_f_hid]) from [<bf800773>] (usb_add_function+0x3a/0xcc [libcomposite]) [ 59.040555] [<bf800773>] (usb_add_function [libcomposite]) from [<bf803541>] (configfs_composite_bind+0x1cc/0x2f0 [libcomposite]) [ 59.052638] [<bf803541>] (configfs_composite_bind [libcomposite]) from [<c054e6e3>] (udc_bind_to_driver+0x1b/0x74) [ 59.063279] [<c054e6e3>] (udc_bind_to_driver) from [<c054e9bb>] (usb_gadget_probe_driver+0x9f/0xd4) [ 59.072730] [<c054e9bb>] (usb_gadget_probe_driver) from [<bf803c3b>] (gadget_dev_desc_UDC_store+0x82/0x98 [libcomposite]) [ 59.084118] [<bf803c3b>] (gadget_dev_desc_UDC_store [libcomposite]) from [<c021e91d>] (configfs_write_file+0x91/0xf8) [ 59.095028] [<c021e91d>] (configfs_write_file) from [<c01d032f>] (__vfs_write+0xf/0xb4) [ 59.103302] [<c01d032f>] (__vfs_write) from [<c01d0d95>] (vfs_write+0x71/0x13c) [ 59.110875] [<c01d0d95>] (vfs_write) from [<c01d1937>] (SyS_write+0x2b/0x64) [ 59.118137] [<c01d1937>] (SyS_write) from [<c0105e61>] (ret_fast_syscall+0x1/0x4c) [ 59.125965] Code: d722 4605 b1a0 6a73 (f993) 2002 [ 59.131522] ---[ end trace 05e0855db8c4b557 ]---
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