Where can I find a full list of wpa-* options for the interfaces file?

I'm looking for an exhaustive list of wpa-* options that can be used in the /etc/network/interfaces file.

The Debian wiki has a how-to-use page here: https://wiki.debian.org/WiFi/HowToUse, which refers to /usr/share/doc/wpasupplicant/README.modes.gz for "additional" wpa-* options, but this file doesn't contain an exhaustive list, only a list of common options.

Where can I find a list of every available wpa-* option?

Failing that, is there an option to specify that wpa_supplicant be started with D-Bus enabled?

EDIT: On enabling D-Bus, looking in /etc/wpa_supplicant/functions.sh, there doesn't appear to be any code that adds a -u to the WPA_SUP_OPTIONS variable. I added it manually to my own functions.sh in the initialisation of WPA_SUP_OPTIONS:

init_wpa_supplicant () {
        [ -n "$WPA_SUP_CONF" ] || return 0

        local WPA_SUP_OPTIONS
        WPA_SUP_OPTIONS="-s -B -P $WPA_SUP_PIDFILE -i $WPA_IFACE -u"
                                                   inserted here ^^

I'm not sure if this script is universal, or specific to Debian.

/etc/wpa_supplicant/functions.sh is what you're interested in. Look at the conf_wpa_supplicant function. In there, look for all of the calls to the wpa_cli_do function; you're interested in the 4th or 5th argument (if set_argument is the 3rd arg, then you want the 5th) to each call.

Here's a list I extracted quickly from the file with some shell magic:

wpa-ap-scan
wpa-preauthenticate
wpa-psk
wpa-wep-key[0..3]
wpa-altsubject-match
wpa-altsubject-match2
wpa-anonymous-identity
wpa-auth-alg
wpa-bssid
wpa-ca-cert
wpa-ca-cert2
wpa-ca-path
wpa-ca-path2
wpa-client-cert
wpa-client-cert2
wpa-dh-file
wpa-dh-file2
wpa-eap
wpa-eap-methods
wpa-eapol-flags
wpa-eappsk
wpa-engine
wpa-engine-id
wpa-fragment-size
wpa-freq-list
wpa-frequency
wpa-group
wpa-identity
wpa-id-str
wpa-key-id
wpa-key-mgmt
wpa-mode
wpa-nai
wpa-pac-file
wpa-pairwise
wpa-password
wpa-pcsc
wpa-peerkey
wpa-phase1
wpa-phase2
wpa-pin
wpa-priority
wpa-private-key
wpa-private-key2
wpa-private-key-passwd
wpa-private-key-passwd2
wpa-proactive-key-caching
wpa-proto
wpa-scan-freq
wpa-scan-ssid
wpa-ssid
wpa-subject-match
wpa-subject-match2
wpa-wep-tx-keyidx