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Add OS descriptors support. Configuring OS descriptors allows Microsoft Windows to bind the right drivers without any additional configuration. Signed-off-by: Thomas Richard <thomas.richard@bootlin.com> Link: https://github.com/openwrt/openwrt/pull/19237 Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
153 lines
3.4 KiB
Bash
153 lines
3.4 KiB
Bash
#!/bin/sh /etc/rc.common
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START=19
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GADGET_FS=/sys/kernel/config/usb_gadget
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GADGET_PRESETS_DIR=/usr/share/usbgadget
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GADGET_PREFIX=owrt_
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log() {
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logger -t usbgadget "$@"
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}
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apply_configs() {
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local fs_path="$1"
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local cfg="$2"
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for param in $(find "$fs_path" -maxdepth 1 -type f -exec basename '{}' ';'); do
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[ "$param" = "UDC" ] && continue
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config_get val "$cfg" "$param"
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[ -n "$val" ] && echo "$val" > "${fs_path}/${param}"
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done
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}
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setup_gadget() {
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local cfg="$1"
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local gadget_path="${GADGET_FS}/${GADGET_PREFIX}${cfg}"
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local param udc
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config_get udc "$cfg" UDC
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[ -z "$udc" ] && return
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mkdir "$gadget_path" || return
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apply_configs "$gadget_path" "$cfg"
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local strings_path="${gadget_path}/strings/0x409"
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mkdir "$strings_path"
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apply_configs "$strings_path" "$cfg"
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local os_desc_path="${gadget_path}/os_desc"
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apply_configs "$os_desc_path" "$cfg"
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}
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setup_configuration() {
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local cfg="$1"
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local gadget
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config_get gadget "$cfg" gadget
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local cfgs_path="${GADGET_FS}/${GADGET_PREFIX}${gadget}/configs"
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[ -d "${cfgs_path}" ] || return
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local cfg_path="${cfgs_path}/${cfg}.1"
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mkdir "$cfg_path" || {
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log "failed to create configuration ${cfg}"
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return
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}
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apply_configs "$cfg_path" "$cfg"
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local strings_path="${cfg_path}/strings/0x409"
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mkdir "$strings_path"
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apply_configs "$strings_path" "$cfg"
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ln -s "$cfg_path" "${GADGET_FS}/${GADGET_PREFIX}${gadget}/os_desc"
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}
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setup_function() {
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local cfg="$1"
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local usbcfg gadget usbfun
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config_get usbcfg "$cfg" configuration
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[ -z "$usbcfg" ] && return
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config_get usbfun "$cfg" function
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[ -z "$usbfun" ] && return
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config_get gadget "$usbcfg" gadget
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local gadget_path="${GADGET_FS}/${GADGET_PREFIX}${gadget}"
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local cfg_path="${gadget_path}/configs/${usbcfg}.1"
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[ -d "${cfg_path}" ] || return
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local fun_path="${gadget_path}/functions/${usbfun}.${cfg}"
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mkdir "$fun_path" || {
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log "failed to create function ${usbfun}.${cfg}"
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return
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}
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apply_configs "$fun_path" "$cfg"
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local os_desc_path="$(find ${fun_path}/os_desc/* -type d)"
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apply_configs "$os_desc_path" "$cfg"
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ln -s "$fun_path" "$cfg_path"
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}
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attach_gadget() {
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local cfg="$1"
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local gadget_path="${GADGET_FS}/${GADGET_PREFIX}${cfg}"
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local param udc
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config_get udc "$cfg" UDC
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[ -z "$udc" ] && return
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echo "$udc" > "$gadget_path/UDC"
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}
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load_gadget() {
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config_foreach setup_gadget gadget
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config_foreach setup_configuration configuration
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config_foreach setup_function function
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config_foreach attach_gadget gadget
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}
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# use subshell for isolated env
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apply_preset() (
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local preset="$1"
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local gadget="$2"
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UCI_CONFIG_DIR=$GADGET_PRESETS_DIR config_load "$1"
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config_set g1 UDC "$2"
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load_gadget
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)
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load_preset() {
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local cfg="$1"
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config_get name "$cfg" name
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config_get udc "$cfg" UDC
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[ -z "$udc" ] && return
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apply_preset $name $udc
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}
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start() {
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grep -q /sys/kernel/config /proc/mounts || \
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mount -t configfs configfs /sys/kernel/config
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[ -d /sys/kernel/config/usb_gadget ] || {
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log "usb_gadget support not found."
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return 1
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}
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config_load usbgadget
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config_foreach load_preset preset
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load_gadget
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}
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stop() {
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for gadget_path in ${GADGET_FS}/${GADGET_PREFIX}* ; do
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[ -d "$gadget_path" ] || continue
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echo "" > ${gadget_path}/UDC
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find ${gadget_path}/os_desc -maxdepth 1 -type l -exec rm '{}' ';'
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find ${gadget_path}/configs -maxdepth 2 -type l -exec rm '{}' ';'
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rmdir ${gadget_path}/configs/*/strings/*
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rmdir ${gadget_path}/configs/*
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rmdir ${gadget_path}/functions/*
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rmdir ${gadget_path}/strings/*
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rmdir $gadget_path
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done
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}
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