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January 17, 2017 02:47
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Pi Zero multiple USB gadgets minimal example
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#!/bin/bash -e | |
modprobe libcomposite | |
cd /sys/kernel/config/usb_gadget/ | |
mkdir g && cd g | |
echo 0x1d6b > idVendor # Linux Foundation | |
echo 0x0104 > idProduct # Multifunction Composite Gadget | |
echo 0x0100 > bcdDevice # v1.0.0 | |
echo 0x0200 > bcdUSB # USB 2.0 | |
echo 0xEF > bDeviceClass | |
echo 0x02 > bDeviceSubClass | |
echo 0x01 > bDeviceProtocol | |
mkdir -p strings/0x409 | |
echo "deadbeef00115599" > strings/0x409/serialnumber | |
echo "irq5 labs" > strings/0x409/manufacturer | |
echo "Pi Zero Gadget" > strings/0x409/product | |
mkdir -p functions/acm.usb0 # serial | |
mkdir -p functions/rndis.usb0 # network | |
mkdir -p configs/c.1 | |
echo 250 > configs/c.1/MaxPower | |
ln -s functions/rndis.usb0 configs/c.1/ | |
ln -s functions/acm.usb0 configs/c.1/ | |
# OS descriptors | |
echo 1 > os_desc/use | |
echo 0xcd > os_desc/b_vendor_code | |
echo MSFT100 > os_desc/qw_sign | |
echo RNDIS > functions/rndis.usb0/os_desc/interface.rndis/compatible_id | |
echo 5162001 > functions/rndis.usb0/os_desc/interface.rndis/sub_compatible_id | |
ln -s configs/c.1 os_desc | |
udevadm settle -t 5 || : | |
ls /sys/class/udc/ > UDC |
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# /usr/lib/systemd/system/myusbgadget.service | |
[Unit] | |
Description=My USB gadget | |
After=systemd-modules-load.service | |
[Service] | |
Type=oneshot | |
RemainAfterExit=yes | |
ExecStart=/usr/bin/myusbgadget | |
[Install] | |
WantedBy=sysinit.target |
Ok more progress. I've isolated the failure to between two releases:
linux-raspberrypi-kernel_1.20180313-1 GOOD
linux-raspberrypi-kernel_1.20180328-1 BAD
Unfortunately it seems to be a massive overhaul, just doing diff -Nur on the drivers/usb/gadget directories yields a 544kbyte file with 19,253 lines. My contribution is done now.
I have an open issue against the Raspberry Pi Kernel (raspberrypi/linux#3862) to track this
For the network part, try this:
https://github.com/rundekugel/USBGadgetNetwork
It combines CDC/ECM and RNDIS
It works for Windows10 / Linux and MACos
I didn't try to add additional cdc/acm, but I think, it should work on most OS.
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Regarding my previous post, I have a new datapoint. I grabbed an older release
linux-raspberrypi-kernel_1.20170215-1.tar.gz
and ran through the steps and everything works as promised. So... something was broken between that release and 5.4.51+:
Linux version 5.4.51+ (dom@buildbot) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611)) #1333 Mon Aug 10 16:38:02 BST 2020
which was the kernel included in the Raspberry Pi OS (32-bit) Lite image I grabbed yesterday... released 2020-08-20 and presumably with sha-256
24342f3668f590d368ce9d57322c401cf2e57f3ca969c88cf9f4df238aaec41f