carl9170: PHY/RF and MAC routines

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/carl9170/mac.c

@@ -0,0 +1,604 @@
+/*
+ * Atheros CARL9170 driver
+ *
+ * MAC programming
+ *
+ * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, see
+ * http://www.gnu.org/licenses/.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *    Copyright (c) 2007-2008 Atheros Communications, Inc.
+ *
+ *    Permission to use, copy, modify, and/or distribute this software for any
+ *    purpose with or without fee is hereby granted, provided that the above
+ *    copyright notice and this permission notice appear in all copies.
+ *
+ *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <asm/unaligned.h>
+
+#include "carl9170.h"
+#include "cmd.h"
+
+int carl9170_set_dyn_sifs_ack(struct ar9170 *ar)
+{
+	u32 val;
+
+	if (conf_is_ht40(&ar->hw->conf))
+		val = 0x010a;
+	else {
+		if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ)
+			val = 0x105;
+		else
+			val = 0x104;
+	}
+
+	return carl9170_write_reg(ar, AR9170_MAC_REG_DYNAMIC_SIFS_ACK, val);
+}
+
+int carl9170_set_rts_cts_rate(struct ar9170 *ar)
+{
+	u32 rts_rate, cts_rate;
+
+	if (conf_is_ht(&ar->hw->conf)) {
+		/* 12 mbit OFDM */
+		rts_rate = 0x1da;
+		cts_rate = 0x10a;
+	} else {
+		if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ) {
+			/* 11 mbit CCK */
+			rts_rate = 033;
+			cts_rate = 003;
+		} else {
+			/* 6 mbit OFDM */
+			rts_rate = 0x1bb;
+			cts_rate = 0x10b;
+		}
+	}
+
+	return carl9170_write_reg(ar, AR9170_MAC_REG_RTS_CTS_RATE,
+				  rts_rate | (cts_rate) << 16);
+}
+
+int carl9170_set_slot_time(struct ar9170 *ar)
+{
+	struct ieee80211_vif *vif;
+	u32 slottime = 20;
+
+	rcu_read_lock();
+	vif = carl9170_get_main_vif(ar);
+	if (!vif) {
+		rcu_read_unlock();
+		return 0;
+	}
+
+	if ((ar->hw->conf.channel->band == IEEE80211_BAND_5GHZ) ||
+	    vif->bss_conf.use_short_slot)
+		slottime = 9;
+
+	rcu_read_unlock();
+
+	return carl9170_write_reg(ar, AR9170_MAC_REG_SLOT_TIME,
+				  slottime << 10);
+}
+
+int carl9170_set_mac_rates(struct ar9170 *ar)
+{
+	struct ieee80211_vif *vif;
+	u32 basic, mandatory;
+
+	rcu_read_lock();
+	vif = carl9170_get_main_vif(ar);
+
+	if (!vif) {
+		rcu_read_unlock();
+		return 0;
+	}
+
+	basic = (vif->bss_conf.basic_rates & 0xf);
+	basic |= (vif->bss_conf.basic_rates & 0xff0) << 4;
+	rcu_read_unlock();
+
+	if (ar->hw->conf.channel->band == IEEE80211_BAND_5GHZ)
+		mandatory = 0xff00; /* OFDM 6/9/12/18/24/36/48/54 */
+	else
+		mandatory = 0xff0f; /* OFDM (6/9../54) + CCK (1/2/5.5/11) */
+
+	carl9170_regwrite_begin(ar);
+	carl9170_regwrite(AR9170_MAC_REG_BASIC_RATE, basic);
+	carl9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, mandatory);
+	carl9170_regwrite_finish();
+
+	return carl9170_regwrite_result();
+}
+
+int carl9170_set_qos(struct ar9170 *ar)
+{
+	carl9170_regwrite_begin(ar);
+
+	carl9170_regwrite(AR9170_MAC_REG_AC0_CW, ar->edcf[0].cw_min |
+			  (ar->edcf[0].cw_max << 16));
+	carl9170_regwrite(AR9170_MAC_REG_AC1_CW, ar->edcf[1].cw_min |
+			  (ar->edcf[1].cw_max << 16));
+	carl9170_regwrite(AR9170_MAC_REG_AC2_CW, ar->edcf[2].cw_min |
+			  (ar->edcf[2].cw_max << 16));
+	carl9170_regwrite(AR9170_MAC_REG_AC3_CW, ar->edcf[3].cw_min |
+			  (ar->edcf[3].cw_max << 16));
+	carl9170_regwrite(AR9170_MAC_REG_AC4_CW, ar->edcf[4].cw_min |
+			  (ar->edcf[4].cw_max << 16));
+
+	carl9170_regwrite(AR9170_MAC_REG_AC2_AC1_AC0_AIFS,
+			  ((ar->edcf[0].aifs * 9 + 10)) |
+			  ((ar->edcf[1].aifs * 9 + 10) << 12) |
+			  ((ar->edcf[2].aifs * 9 + 10) << 24));
+	carl9170_regwrite(AR9170_MAC_REG_AC4_AC3_AC2_AIFS,
+			  ((ar->edcf[2].aifs * 9 + 10) >> 8) |
+			  ((ar->edcf[3].aifs * 9 + 10) << 4) |
+			  ((ar->edcf[4].aifs * 9 + 10) << 16));
+
+	carl9170_regwrite(AR9170_MAC_REG_AC1_AC0_TXOP,
+			  ar->edcf[0].txop | ar->edcf[1].txop << 16);
+	carl9170_regwrite(AR9170_MAC_REG_AC3_AC2_TXOP,
+			  ar->edcf[2].txop | ar->edcf[3].txop << 16 |
+			  ar->edcf[4].txop << 24);
+
+	carl9170_regwrite_finish();
+
+	return carl9170_regwrite_result();
+}
+
+int carl9170_init_mac(struct ar9170 *ar)
+{
+	carl9170_regwrite_begin(ar);
+
+	/* switch MAC to OTUS interface */
+	carl9170_regwrite(0x1c3600, 0x3);
+
+	carl9170_regwrite(AR9170_MAC_REG_ACK_EXTENSION, 0x40);
+
+	carl9170_regwrite(AR9170_MAC_REG_RETRY_MAX, 0x0);
+
+	carl9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
+			  AR9170_MAC_FTF_MONITOR);
+
+	/* enable MMIC */
+	carl9170_regwrite(AR9170_MAC_REG_SNIFFER,
+			AR9170_MAC_SNIFFER_DEFAULTS);
+
+	carl9170_regwrite(AR9170_MAC_REG_RX_THRESHOLD, 0xc1f80);
+
+	carl9170_regwrite(AR9170_MAC_REG_RX_PE_DELAY, 0x70);
+	carl9170_regwrite(AR9170_MAC_REG_EIFS_AND_SIFS, 0xa144000);
+	carl9170_regwrite(AR9170_MAC_REG_SLOT_TIME, 9 << 10);
+
+	/* CF-END & CF-ACK rate => 24M OFDM */
+	carl9170_regwrite(AR9170_MAC_REG_TID_CFACK_CFEND_RATE, 0x59900000);
+
+	/* NAV protects ACK only (in TXOP) */
+	carl9170_regwrite(AR9170_MAC_REG_TXOP_DURATION, 0x201);
+
+	/* Set Beacon PHY CTRL's TPC to 0x7, TA1=1 */
+	/* OTUS set AM to 0x1 */
+	carl9170_regwrite(AR9170_MAC_REG_BCN_HT1, 0x8000170);
+
+	carl9170_regwrite(AR9170_MAC_REG_BACKOFF_PROTECT, 0x105);
+
+	/* Aggregation MAX number and timeout */
+	carl9170_regwrite(AR9170_MAC_REG_AMPDU_FACTOR, 0xa);
+	carl9170_regwrite(AR9170_MAC_REG_AMPDU_DENSITY, 0x140a00);
+
+	carl9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
+			  AR9170_MAC_FTF_DEFAULTS);
+
+	carl9170_regwrite(AR9170_MAC_REG_RX_CONTROL,
+			  AR9170_MAC_RX_CTRL_DEAGG |
+			  AR9170_MAC_RX_CTRL_SHORT_FILTER);
+
+	/* rate sets */
+	carl9170_regwrite(AR9170_MAC_REG_BASIC_RATE, 0x150f);
+	carl9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, 0x150f);
+	carl9170_regwrite(AR9170_MAC_REG_RTS_CTS_RATE, 0x0030033);
+
+	/* MIMO response control */
+	carl9170_regwrite(AR9170_MAC_REG_ACK_TPC, 0x4003c1e);
+
+	carl9170_regwrite(AR9170_MAC_REG_AMPDU_RX_THRESH, 0xffff);
+
+	/* set PHY register read timeout (??) */
+	carl9170_regwrite(AR9170_MAC_REG_MISC_680, 0xf00008);
+
+	/* Disable Rx TimeOut, workaround for BB. */
+	carl9170_regwrite(AR9170_MAC_REG_RX_TIMEOUT, 0x0);
+
+	/* Set WLAN DMA interrupt mode: generate int per packet */
+	carl9170_regwrite(AR9170_MAC_REG_TXRX_MPI, 0x110011);
+
+	carl9170_regwrite(AR9170_MAC_REG_FCS_SELECT,
+			AR9170_MAC_FCS_FIFO_PROT);
+
+	/* Disables the CF_END frame, undocumented register */
+	carl9170_regwrite(AR9170_MAC_REG_TXOP_NOT_ENOUGH_IND,
+			0x141e0f48);
+
+	/* reset group hash table */
+	carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L, 0xffffffff);
+	carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H, 0xffffffff);
+
+	/* disable PRETBTT interrupt */
+	carl9170_regwrite(AR9170_MAC_REG_PRETBTT, 0x0);
+	carl9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, 0x0);
+
+	carl9170_regwrite_finish();
+
+	return carl9170_regwrite_result();
+}
+
+static int carl9170_set_mac_reg(struct ar9170 *ar,
+				const u32 reg, const u8 *mac)
+{
+	static const u8 zero[ETH_ALEN] = { 0 };
+
+	if (!mac)
+		mac = zero;
+
+	carl9170_regwrite_begin(ar);
+
+	carl9170_regwrite(reg, get_unaligned_le32(mac));
+	carl9170_regwrite(reg + 4, get_unaligned_le16(mac + 4));
+
+	carl9170_regwrite_finish();
+
+	return carl9170_regwrite_result();
+}
+
+int carl9170_mod_virtual_mac(struct ar9170 *ar, const unsigned int id,
+			     const u8 *mac)
+{
+	if (WARN_ON(id >= ar->fw.vif_num))
+		return -EINVAL;
+
+	return carl9170_set_mac_reg(ar,
+		AR9170_MAC_REG_ACK_TABLE + (id - 1) * 8, mac);
+}
+
+int carl9170_update_multicast(struct ar9170 *ar, const u64 mc_hash)
+{
+	int err;
+
+	carl9170_regwrite_begin(ar);
+	carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H, mc_hash >> 32);
+	carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L, mc_hash);
+	carl9170_regwrite_finish();
+	err = carl9170_regwrite_result();
+	if (err)
+		return err;
+
+	ar->cur_mc_hash = mc_hash;
+	return 0;
+}
+
+int carl9170_set_operating_mode(struct ar9170 *ar)
+{
+	struct ieee80211_vif *vif;
+	struct ath_common *common = &ar->common;
+	u8 *mac_addr, *bssid;
+	u32 cam_mode = AR9170_MAC_CAM_DEFAULTS;
+	u32 enc_mode = AR9170_MAC_ENCRYPTION_DEFAULTS;
+	u32 rx_ctrl = AR9170_MAC_RX_CTRL_DEAGG |
+		      AR9170_MAC_RX_CTRL_SHORT_FILTER;
+	u32 sniffer = AR9170_MAC_SNIFFER_DEFAULTS;
+	int err = 0;
+
+	rcu_read_lock();
+	vif = carl9170_get_main_vif(ar);
+
+	if (vif) {
+		mac_addr = common->macaddr;
+		bssid = common->curbssid;
+
+		switch (vif->type) {
+		case NL80211_IFTYPE_MESH_POINT:
+		case NL80211_IFTYPE_ADHOC:
+			cam_mode |= AR9170_MAC_CAM_IBSS;
+			break;
+		case NL80211_IFTYPE_AP:
+			cam_mode |= AR9170_MAC_CAM_AP;
+
+			/* iwlagn 802.11n STA Workaround */
+			rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
+			break;
+		case NL80211_IFTYPE_WDS:
+			cam_mode |= AR9170_MAC_CAM_AP_WDS;
+			rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
+			break;
+		case NL80211_IFTYPE_STATION:
+			cam_mode |= AR9170_MAC_CAM_STA;
+			rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
+			break;
+		default:
+			WARN(1, "Unsupported operation mode %x\n", vif->type);
+			err = -EOPNOTSUPP;
+			break;
+		}
+	} else {
+		mac_addr = NULL;
+		bssid = NULL;
+	}
+	rcu_read_unlock();
+
+	if (err)
+		return err;
+
+	if (ar->rx_software_decryption)
+		enc_mode |= AR9170_MAC_ENCRYPTION_RX_SOFTWARE;
+
+	if (ar->sniffer_enabled) {
+		rx_ctrl |= AR9170_MAC_RX_CTRL_ACK_IN_SNIFFER;
+		sniffer |= AR9170_MAC_SNIFFER_ENABLE_PROMISC;
+		enc_mode |= AR9170_MAC_ENCRYPTION_RX_SOFTWARE;
+	}
+
+	err = carl9170_set_mac_reg(ar, AR9170_MAC_REG_MAC_ADDR_L, mac_addr);
+	if (err)
+		return err;
+
+	err = carl9170_set_mac_reg(ar, AR9170_MAC_REG_BSSID_L, bssid);
+	if (err)
+		return err;
+
+	carl9170_regwrite_begin(ar);
+	carl9170_regwrite(AR9170_MAC_REG_SNIFFER, sniffer);
+	carl9170_regwrite(AR9170_MAC_REG_CAM_MODE, cam_mode);
+	carl9170_regwrite(AR9170_MAC_REG_ENCRYPTION, enc_mode);
+	carl9170_regwrite(AR9170_MAC_REG_RX_CONTROL, rx_ctrl);
+	carl9170_regwrite_finish();
+
+	return carl9170_regwrite_result();
+}
+
+int carl9170_set_hwretry_limit(struct ar9170 *ar, const unsigned int max_retry)
+{
+	u32 tmp = min_t(u32, 0x33333, max_retry * 0x11111);
+
+	return carl9170_write_reg(ar, AR9170_MAC_REG_RETRY_MAX, tmp);
+}
+
+int carl9170_set_beacon_timers(struct ar9170 *ar)
+{
+	struct ieee80211_vif *vif;
+	u32 v = 0;
+	u32 pretbtt = 0;
+
+	rcu_read_lock();
+	vif = carl9170_get_main_vif(ar);
+
+	if (vif) {
+		struct carl9170_vif_info *mvif;
+		mvif = (void *) vif->drv_priv;
+
+		if (mvif->enable_beacon && !WARN_ON(!ar->beacon_enabled)) {
+			ar->global_beacon_int = vif->bss_conf.beacon_int /
+						ar->beacon_enabled;
+
+			SET_VAL(AR9170_MAC_BCN_DTIM, v,
+				vif->bss_conf.dtim_period);
+
+			switch (vif->type) {
+			case NL80211_IFTYPE_MESH_POINT:
+			case NL80211_IFTYPE_ADHOC:
+				v |= AR9170_MAC_BCN_IBSS_MODE;
+				break;
+			case NL80211_IFTYPE_AP:
+				v |= AR9170_MAC_BCN_AP_MODE;
+				break;
+			default:
+				WARN_ON_ONCE(1);
+				break;
+			}
+		} else if (vif->type == NL80211_IFTYPE_STATION) {
+			ar->global_beacon_int = vif->bss_conf.beacon_int;
+
+			SET_VAL(AR9170_MAC_BCN_DTIM, v,
+				ar->hw->conf.ps_dtim_period);
+
+			v |= AR9170_MAC_BCN_STA_PS |
+			     AR9170_MAC_BCN_PWR_MGT;
+		}
+
+		if (ar->global_beacon_int) {
+			if (ar->global_beacon_int < 15) {
+				rcu_read_unlock();
+				return -ERANGE;
+			}
+
+			ar->global_pretbtt = ar->global_beacon_int -
+					CARL9170_PRETBTT_KUS;
+		} else {
+			ar->global_pretbtt = 0;
+		}
+	} else {
+		ar->global_beacon_int = 0;
+		ar->global_pretbtt = 0;
+	}
+
+	rcu_read_unlock();
+
+	SET_VAL(AR9170_MAC_BCN_PERIOD, v, ar->global_beacon_int);
+	SET_VAL(AR9170_MAC_PRETBTT, pretbtt, ar->global_pretbtt);
+	SET_VAL(AR9170_MAC_PRETBTT2, pretbtt, ar->global_pretbtt);
+
+	carl9170_regwrite_begin(ar);
+	carl9170_regwrite(AR9170_MAC_REG_PRETBTT, pretbtt);
+	carl9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, v);
+	carl9170_regwrite_finish();
+	return carl9170_regwrite_result();
+}
+
+int carl9170_update_beacon(struct ar9170 *ar, const bool submit)
+{
+	struct sk_buff *skb;
+	struct carl9170_vif_info *cvif;
+	__le32 *data, *old = NULL;
+	u32 word, off, addr, len;
+	int i = 0, err = 0;
+
+	rcu_read_lock();
+	cvif = rcu_dereference(ar->beacon_iter);
+retry:
+	if (ar->vifs == 0 || !cvif)
+		goto out_unlock;
+
+	list_for_each_entry_continue_rcu(cvif, &ar->vif_list, list) {
+		if (cvif->active && cvif->enable_beacon)
+			goto found;
+	}
+
+	if (!ar->beacon_enabled || i++)
+		goto out_unlock;
+
+	goto retry;
+
+found:
+	rcu_assign_pointer(ar->beacon_iter, cvif);
+
+	skb = ieee80211_beacon_get_tim(ar->hw, carl9170_get_vif(cvif),
+		NULL, NULL);
+
+	if (!skb) {
+		err = -ENOMEM;
+		goto out_unlock;
+	}
+
+	spin_lock_bh(&ar->beacon_lock);
+	data = (__le32 *)skb->data;
+	if (cvif->beacon)
+		old = (__le32 *)cvif->beacon->data;
+
+	off = cvif->id * AR9170_MAC_BCN_LENGTH_MAX;
+	addr = ar->fw.beacon_addr + off;
+	len = roundup(skb->len + FCS_LEN, 4);
+
+	if ((off + len) > ar->fw.beacon_max_len) {
+		if (net_ratelimit()) {
+			wiphy_err(ar->hw->wiphy, "beacon does not "
+				  "fit into device memory!\n");
+		}
+
+		spin_unlock_bh(&ar->beacon_lock);
+		dev_kfree_skb_any(skb);
+		err = -EINVAL;
+		goto out_unlock;
+	}
+
+	if (len > AR9170_MAC_BCN_LENGTH_MAX) {
+		if (net_ratelimit()) {
+			wiphy_err(ar->hw->wiphy, "no support for beacons "
+				"bigger than %d (yours:%d).\n",
+				 AR9170_MAC_BCN_LENGTH_MAX, len);
+		}
+
+		spin_unlock_bh(&ar->beacon_lock);
+		dev_kfree_skb_any(skb);
+		err = -EMSGSIZE;
+		goto out_unlock;
+	}
+
+	carl9170_async_regwrite_begin(ar);
+
+	/* XXX: use skb->cb info */
+	if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ) {
+		carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP,
+				((skb->len + FCS_LEN) << (3 + 16)) + 0x0400);
+	} else {
+		carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP,
+				((skb->len + FCS_LEN) << 16) + 0x001b);
+	}
+
+	for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
+		/*
+		 * XXX: This accesses beyond skb data for up
+		 *	to the last 3 bytes!!
+		 */
+
+		if (old && (data[i] == old[i]))
+			continue;
+
+		word = le32_to_cpu(data[i]);
+		carl9170_async_regwrite(addr + 4 * i, word);
+	}
+	carl9170_async_regwrite_finish();
+
+	dev_kfree_skb_any(cvif->beacon);
+	cvif->beacon = NULL;
+
+	err = carl9170_async_regwrite_result();
+	if (!err)
+		cvif->beacon = skb;
+	spin_unlock_bh(&ar->beacon_lock);
+	if (err)
+		goto out_unlock;
+
+	if (submit) {
+		err = carl9170_bcn_ctrl(ar, cvif->id,
+					CARL9170_BCN_CTRL_CAB_TRIGGER,
+					addr, skb->len + FCS_LEN);
+
+		if (err)
+			goto out_unlock;
+	}
+out_unlock:
+	rcu_read_unlock();
+	return err;
+}
+
+int carl9170_upload_key(struct ar9170 *ar, const u8 id, const u8 *mac,
+			const u8 ktype, const u8 keyidx, const u8 *keydata,
+			const int keylen)
+{
+	struct carl9170_set_key_cmd key = { };
+	static const u8 bcast[ETH_ALEN] = {
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+	mac = mac ? : bcast;
+
+	key.user = cpu_to_le16(id);
+	key.keyId = cpu_to_le16(keyidx);
+	key.type = cpu_to_le16(ktype);
+	memcpy(&key.macAddr, mac, ETH_ALEN);
+	if (keydata)
+		memcpy(&key.key, keydata, keylen);
+
+	return carl9170_exec_cmd(ar, CARL9170_CMD_EKEY,
+		sizeof(key), (u8 *)&key, 0, NULL);
+}
+
+int carl9170_disable_key(struct ar9170 *ar, const u8 id)
+{
+	struct carl9170_disable_key_cmd key = { };
+
+	key.user = cpu_to_le16(id);
+
+	return carl9170_exec_cmd(ar, CARL9170_CMD_DKEY,
+		sizeof(key), (u8 *)&key, 0, NULL);
+}