74 lines
2.8 KiB
Bash
Executable File
74 lines
2.8 KiB
Bash
Executable File
#!/bin/sh /etc/rc.common
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# SPDX-License-Identifier: GPL-2.0-or-later
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# This file is based on postmarketOS initfs code.
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# See: https://gitlab.com/postmarketOS/pmaports/-/blob/master/main/postmarketos-mkinitfs/
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START=20
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deviceinfo_manufacturer="Generic"
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deviceinfo_usb_serialnumber="123456"
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setup_usb_network_configfs() {
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# See: https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt
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CONFIGFS=/sys/kernel/config/usb_gadget
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if ! [ -e "$CONFIGFS" ]; then
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echo " /config/usb_gadget does not exist, skipping configfs usb gadget"
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return
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fi
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# Default values for USB-related deviceinfo variables
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usb_idVendor="${deviceinfo_usb_idVendor:-0x18D1}" # default: Google Inc.
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usb_idProduct="${deviceinfo_usb_idProduct:-0xD001}" # default: Nexus 4 (fastboot)
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usb_serialnumber="${deviceinfo_usb_serialnumber:-OpenWRT}"
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usb_rndis_function="${deviceinfo_usb_rndis_function:-rndis.usb0}"
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echo " Setting up an USB gadget through configfs"
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# Create an usb gadet configuration
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mkdir $CONFIGFS/g1 || echo " Couldn't create $CONFIGFS/g1"
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echo "$usb_idVendor" > "$CONFIGFS/g1/idVendor"
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echo "$usb_idProduct" > "$CONFIGFS/g1/idProduct"
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# Create english (0x409) strings
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mkdir $CONFIGFS/g1/strings/0x409 || echo " Couldn't create $CONFIGFS/g1/strings/0x409"
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# shellcheck disable=SC2154
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echo "$deviceinfo_manufacturer" > "$CONFIGFS/g1/strings/0x409/manufacturer"
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echo "$usb_serialnumber" > "$CONFIGFS/g1/strings/0x409/serialnumber"
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# shellcheck disable=SC2154
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echo "$deviceinfo_name" > "$CONFIGFS/g1/strings/0x409/product"
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# Create rndis function. The function can be named differently in downstream kernels.
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mkdir $CONFIGFS/g1/functions/"$usb_rndis_function" \
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|| echo " Couldn't create $CONFIGFS/g1/functions/$usb_rndis_function"
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# Create configuration instance for the gadget
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mkdir $CONFIGFS/g1/configs/c.1 \
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|| echo " Couldn't create $CONFIGFS/g1/configs/c.1"
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mkdir $CONFIGFS/g1/configs/c.1/strings/0x409 \
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|| echo " Couldn't create $CONFIGFS/g1/configs/c.1/strings/0x409"
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echo "rndis" > $CONFIGFS/g1/configs/c.1/strings/0x409/configuration \
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|| echo " Couldn't write configration name"
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# Link the rndis instance to the configuration
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ln -s $CONFIGFS/g1/functions/"$usb_rndis_function" $CONFIGFS/g1/configs/c.1 \
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|| echo " Couldn't symlink $usb_rndis_function"
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# Check if there's an USB Device Controller
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if [ -z "$(ls /sys/class/udc)" ]; then
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echo " No USB Device Controller available"
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return
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fi
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# Link the gadget instance to an USB Device Controller. This activates the gadget.
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# See also: https://github.com/postmarketOS/pmbootstrap/issues/338
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# shellcheck disable=SC2005
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echo "$(ls /sys/class/udc)" > $CONFIGFS/g1/UDC || echo " Couldn't write UDC"
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}
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start() {
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mount -t configfs none /sys/kernel/config
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setup_usb_network_configfs
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}
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