From e4d96dcfadeae6cf5fe065e41d2886fa36b8981f Mon Sep 17 00:00:00 2001
From: Adrian Chadd <adrian@FreeBSD.org>
Date: Sat, 19 Mar 2016 04:37:33 +0000
Subject: [PATCH] [net80211] Add VHT Transmit Power Envelope element -
 802.11ac-2013 8.4.2.164

This .. seems inconsistently transmitted from various vendors.
---
 sys/net80211/ieee80211.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/sys/net80211/ieee80211.h b/sys/net80211/ieee80211.h
index d813e89eb49..7ace97e9c77 100644
--- a/sys/net80211/ieee80211.h
+++ b/sys/net80211/ieee80211.h
@@ -803,6 +803,39 @@ struct ieee80211_ie_vht_operation {
 #define	IEEE80211_VHTCAP_RX_ANTENNA_PATTERN	0x10000000
 #define	IEEE80211_VHTCAP_TX_ANTENNA_PATTERN	0x20000000
 
+/*
+ * VHT Transmit Power Envelope element - 802.11ac-2013 8.4.2.164
+ *
+ * This defines the maximum transmit power for various bandwidths.
+ */
+/*
+ * Count is how many elements follow and what they're for:
+ *
+ * 0 - 20 MHz
+ * 1 - 20+40 MHz
+ * 2 - 20+40+80 MHz
+ * 3 - 20+40+80+(160, 80+80) MHz
+ */
+#define	IEEE80211_VHT_TXPWRENV_INFO_COUNT_SHIFT	0
+#define	IEEE80211_VHT_TXPWRENV_INFO_COUNT_MASK	0x07
+
+/*
+ * Unit is the tx power representation.  It should be EIRP for now;
+ * other values are reserved.
+ */
+#define	IEEE80211_VHT_TXPWRENV_UNIT_MASK	0x38
+#define	IEEE80211_VHT_TXPWRENV_UNIT_SHIFT	3
+
+/* This value is within the unit mask/shift above */
+#define	IEEE80211_VHT_TXPWRENV_UNIT_EIRP	0
+
+struct ieee80211_ie_vht_txpwrenv {
+	uint8_t ie;
+	uint8_t len;
+	uint8_t tx_info;
+	int8_t tx_elem[0];	/* TX power elements, 1/2 dB, signed */
+};
+
 /* VHT action codes */
 #define	WLAN_ACTION_VHT_COMPRESSED_BF		0
 #define	WLAN_ACTION_VHT_GROUPID_MGMT		1