diff --git a/sys/dev/rtwn/if_rtwn.c b/sys/dev/rtwn/if_rtwn.c
--- a/sys/dev/rtwn/if_rtwn.c
+++ b/sys/dev/rtwn/if_rtwn.c
@@ -232,6 +232,7 @@
 		| IEEE80211_C_WME		/* 802.11e */
 		| IEEE80211_C_SWAMSDUTX		/* Do software A-MSDU TX */
 		| IEEE80211_C_FF		/* Atheros fast-frames */
+		| IEEE80211_C_TXPMGT		/* TX power control */
 		;
 
 	if (sc->sc_hwcrypto != RTWN_CRYPTO_SW) {
@@ -696,6 +697,14 @@
 	case IEEE80211_IOC_LDPC:
 		error = 0;
 		break;
+	case IEEE80211_IOC_TXPOWER:
+		{
+			struct rtwn_softc *sc = vap->iv_ic->ic_softc;
+			RTWN_LOCK(sc);
+			error = rtwn_set_tx_power(sc, vap);
+			RTWN_UNLOCK(sc);
+		}
+		break;
 	default:
 		error = ENETRESET;
 		break;
diff --git a/sys/dev/rtwn/if_rtwn_nop.h b/sys/dev/rtwn/if_rtwn_nop.h
--- a/sys/dev/rtwn/if_rtwn_nop.h
+++ b/sys/dev/rtwn/if_rtwn_nop.h
@@ -54,6 +54,12 @@
 {
 }
 
+static __inline int
+rtwn_nop_int_softc_vap(struct rtwn_softc *sc, struct ieee80211vap *vap)
+{
+	return (0);
+}
+
 static __inline void
 rtwn_nop_softc_uint8_int(struct rtwn_softc *sc, uint8_t *buf, int len)
 {
diff --git a/sys/dev/rtwn/if_rtwnvar.h b/sys/dev/rtwn/if_rtwnvar.h
--- a/sys/dev/rtwn/if_rtwnvar.h
+++ b/sys/dev/rtwn/if_rtwnvar.h
@@ -366,6 +366,8 @@
 	void		(*sc_init_antsel)(struct rtwn_softc *);
 	void		(*sc_post_init)(struct rtwn_softc *);
 	int		(*sc_init_bcnq1_boundary)(struct rtwn_softc *);
+	int		(*sc_set_tx_power)(struct rtwn_softc *,
+			    struct ieee80211vap *);
 
 	const uint8_t			*chan_list_5ghz[3];
 	int				chan_num_5ghz[3];
@@ -590,6 +592,8 @@
 	(((_sc)->sc_post_init)((_sc)))
 #define rtwn_init_bcnq1_boundary(_sc) \
 	(((_sc)->sc_init_bcnq1_boundary)((_sc)))
+#define rtwn_set_tx_power(_sc, _vap) \
+	(((_sc)->sc_set_tx_power)((_sc), (_vap)))
 
 /*
  * Methods to access subfields in registers.
diff --git a/sys/dev/rtwn/rtl8188e/pci/r88ee_attach.c b/sys/dev/rtwn/rtl8188e/pci/r88ee_attach.c
--- a/sys/dev/rtwn/rtl8188e/pci/r88ee_attach.c
+++ b/sys/dev/rtwn/rtl8188e/pci/r88ee_attach.c
@@ -191,6 +191,7 @@
 	sc->sc_init_antsel		= rtwn_nop_softc;
 	sc->sc_post_init		= r88ee_post_init;
 	sc->sc_init_bcnq1_boundary	= rtwn_nop_int_softc;
+	sc->sc_set_tx_power		= rtwn_nop_int_softc_vap;
 
 	sc->mac_prog			= &rtl8188e_mac[0];
 	sc->mac_size			= nitems(rtl8188e_mac);
diff --git a/sys/dev/rtwn/rtl8188e/usb/r88eu_attach.c b/sys/dev/rtwn/rtl8188e/usb/r88eu_attach.c
--- a/sys/dev/rtwn/rtl8188e/usb/r88eu_attach.c
+++ b/sys/dev/rtwn/rtl8188e/usb/r88eu_attach.c
@@ -184,6 +184,7 @@
 	sc->sc_init_antsel		= rtwn_nop_softc;
 	sc->sc_post_init		= r88eu_post_init;
 	sc->sc_init_bcnq1_boundary	= rtwn_nop_int_softc;
+	sc->sc_set_tx_power		= rtwn_nop_int_softc_vap;
 
 	sc->mac_prog			= &rtl8188e_mac[0];
 	sc->mac_size			= nitems(rtl8188e_mac);
diff --git a/sys/dev/rtwn/rtl8192c/pci/r92ce_attach.c b/sys/dev/rtwn/rtl8192c/pci/r92ce_attach.c
--- a/sys/dev/rtwn/rtl8192c/pci/r92ce_attach.c
+++ b/sys/dev/rtwn/rtl8192c/pci/r92ce_attach.c
@@ -221,6 +221,7 @@
 	sc->sc_init_antsel		= rtwn_nop_softc;
 	sc->sc_post_init		= r92ce_post_init;
 	sc->sc_init_bcnq1_boundary	= rtwn_nop_int_softc;
+	sc->sc_set_tx_power		= rtwn_nop_int_softc_vap;
 
 	sc->mac_prog			= &rtl8192ce_mac[0];
 	sc->mac_size			= nitems(rtl8192ce_mac);
diff --git a/sys/dev/rtwn/rtl8192c/usb/r92cu_attach.c b/sys/dev/rtwn/rtl8192c/usb/r92cu_attach.c
--- a/sys/dev/rtwn/rtl8192c/usb/r92cu_attach.c
+++ b/sys/dev/rtwn/rtl8192c/usb/r92cu_attach.c
@@ -213,6 +213,7 @@
 	sc->sc_init_antsel		= r92c_init_antsel;
 	sc->sc_post_init		= r92cu_post_init;
 	sc->sc_init_bcnq1_boundary	= rtwn_nop_int_softc;
+	sc->sc_set_tx_power		= rtwn_nop_int_softc_vap;
 
 	sc->mac_prog			= &rtl8192cu_mac[0];
 	sc->mac_size			= nitems(rtl8192cu_mac);
diff --git a/sys/dev/rtwn/rtl8192e/usb/r92eu_attach.c b/sys/dev/rtwn/rtl8192e/usb/r92eu_attach.c
--- a/sys/dev/rtwn/rtl8192e/usb/r92eu_attach.c
+++ b/sys/dev/rtwn/rtl8192e/usb/r92eu_attach.c
@@ -164,6 +164,7 @@
 	sc->sc_init_antsel		= rtwn_nop_softc;
 	sc->sc_post_init		= r92eu_post_init;
 	sc->sc_init_bcnq1_boundary	= rtwn_nop_int_softc;
+	sc->sc_set_tx_power		= rtwn_nop_int_softc_vap;
 
 	sc->mac_prog			= &rtl8192eu_mac[0];
 	sc->mac_size			= nitems(rtl8192eu_mac);
diff --git a/sys/dev/rtwn/rtl8812a/usb/r12au_attach.c b/sys/dev/rtwn/rtl8812a/usb/r12au_attach.c
--- a/sys/dev/rtwn/rtl8812a/usb/r12au_attach.c
+++ b/sys/dev/rtwn/rtl8812a/usb/r12au_attach.c
@@ -251,6 +251,7 @@
 	sc->sc_init_antsel		= r12a_init_antsel;
 	sc->sc_post_init		= r12au_post_init;
 	sc->sc_init_bcnq1_boundary	= rtwn_nop_int_softc;
+	sc->sc_set_tx_power		= rtwn_nop_int_softc_vap;
 
 	sc->chan_list_5ghz[0]		= r12a_chan_5ghz_0;
 	sc->chan_list_5ghz[1]		= r12a_chan_5ghz_1;
diff --git a/sys/dev/rtwn/rtl8821a/usb/r21au_attach.c b/sys/dev/rtwn/rtl8821a/usb/r21au_attach.c
--- a/sys/dev/rtwn/rtl8821a/usb/r21au_attach.c
+++ b/sys/dev/rtwn/rtl8821a/usb/r21au_attach.c
@@ -237,6 +237,7 @@
 	sc->sc_init_antsel		= r12a_init_antsel;
 	sc->sc_post_init		= r12au_post_init;
 	sc->sc_init_bcnq1_boundary	= r21a_init_bcnq1_boundary;
+	sc->sc_set_tx_power		= rtwn_nop_int_softc_vap;
 
 	sc->chan_list_5ghz[0]		= r12a_chan_5ghz_0;
 	sc->chan_list_5ghz[1]		= r12a_chan_5ghz_1;