carl9170: mac80211 glue and command interface

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

1 files changed, 626 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/carl9170/carl9170.h b/drivers/net/wireless/ath/carl9170/carl9170.h
new file mode 100644
index 000000000000..9f1d60359061
--- /dev/null
+++ b/drivers/net/wireless/ath/carl9170/carl9170.h
@@ -0,0 +1,626 @@
+/*
+ * Atheros CARL9170 driver
+ *
+ * Driver specific definitions
+ *
+ * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
+ *
+ * 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.
+ */
+#ifndef __CARL9170_H
+#define __CARL9170_H
+
+#include <linux/kernel.h>
+#include <linux/firmware.h>
+#include <linux/completion.h>
+#include <linux/spinlock.h>
+#include <net/cfg80211.h>
+#include <net/mac80211.h>
+#include <linux/usb.h>
+#ifdef CONFIG_CARL9170_LEDS
+#include <linux/leds.h>
+#endif /* CONFIG_CARL170_LEDS */
+#ifdef CONFIG_CARL9170_WPC
+#include <linux/input.h>
+#endif /* CONFIG_CARL9170_WPC */
+#include "eeprom.h"
+#include "wlan.h"
+#include "hw.h"
+#include "fwdesc.h"
+#include "fwcmd.h"
+#include "../regd.h"
+
+#ifdef CONFIG_CARL9170_DEBUGFS
+#include "debug.h"
+#endif /* CONFIG_CARL9170_DEBUGFS */
+
+#define CARL9170FW_NAME "carl9170-1.fw"
+
+#define PAYLOAD_MAX     (CARL9170_MAX_CMD_LEN / 4 - 1)
+
+enum carl9170_rf_init_mode {
+        CARL9170_RFI_NONE,
+        CARL9170_RFI_WARM,
+        CARL9170_RFI_COLD,
+};
+
+#define CARL9170_MAX_RX_BUFFER_SIZE             8192
+
+enum carl9170_device_state {
+        CARL9170_UNKNOWN_STATE,
+        CARL9170_STOPPED,
+        CARL9170_IDLE,
+        CARL9170_STARTED,
+};
+
+#define CARL9170_NUM_TID                16
+#define WME_BA_BMP_SIZE                 64
+#define CARL9170_TX_USER_RATE_TRIES     3
+
+#define WME_AC_BE   2
+#define WME_AC_BK   3
+#define WME_AC_VI   1
+#define WME_AC_VO   0
+
+#define TID_TO_WME_AC(_tid)                             \
+        ((((_tid) == 0) || ((_tid) == 3)) ? WME_AC_BE : \
+         (((_tid) == 1) || ((_tid) == 2)) ? WME_AC_BK : \
+         (((_tid) == 4) || ((_tid) == 5)) ? WME_AC_VI : \
+         WME_AC_VO)
+
+#define SEQ_DIFF(_start, _seq) \
+        (((_start) - (_seq)) & 0x0fff)
+#define SEQ_PREV(_seq) \
+        (((_seq) - 1) & 0x0fff)
+#define SEQ_NEXT(_seq) \
+        (((_seq) + 1) & 0x0fff)
+#define BAW_WITHIN(_start, _bawsz, _seqno) \
+        ((((_seqno) - (_start)) & 0xfff) < (_bawsz))
+
+enum carl9170_tid_state {
+        CARL9170_TID_STATE_INVALID,
+        CARL9170_TID_STATE_KILLED,
+        CARL9170_TID_STATE_SHUTDOWN,
+        CARL9170_TID_STATE_SUSPEND,
+        CARL9170_TID_STATE_PROGRESS,
+        CARL9170_TID_STATE_IDLE,
+        CARL9170_TID_STATE_XMIT,
+};
+
+#define CARL9170_BAW_BITS (2 * WME_BA_BMP_SIZE)
+#define CARL9170_BAW_SIZE (BITS_TO_LONGS(CARL9170_BAW_BITS))
+#define CARL9170_BAW_LEN (DIV_ROUND_UP(CARL9170_BAW_BITS, BITS_PER_BYTE))
+
+struct carl9170_sta_tid {
+        /* must be the first entry! */
+        struct list_head list;
+
+        /* temporary list for RCU unlink procedure */
+        struct list_head tmp_list;
+
+        /* lock for the following data structures */
+        spinlock_t lock;
+
+        unsigned int counter;
+        enum carl9170_tid_state state;
+        u8 tid;         /* TID number ( 0 - 15 ) */
+        u16 max;        /* max. AMPDU size */
+
+        u16 snx;        /* awaiting _next_ frame */
+        u16 hsn;        /* highest _queued_ sequence */
+        u16 bsn;        /* base of the tx/agg bitmap */
+        unsigned long bitmap[CARL9170_BAW_SIZE];
+
+        /* Preaggregation reorder queue */
+        struct sk_buff_head queue;
+};
+
+#define CARL9170_QUEUE_TIMEOUT          256
+#define CARL9170_BUMP_QUEUE             1000
+#define CARL9170_TX_TIMEOUT             2500
+#define CARL9170_JANITOR_DELAY          128
+#define CARL9170_QUEUE_STUCK_TIMEOUT    5500
+
+#define CARL9170_NUM_TX_AGG_MAX         30
+
+/*
+ * Tradeoff between stability/latency and speed.
+ *
+ * AR9170_TXQ_DEPTH is devised by dividing the amount of available
+ * tx buffers with the size of a full ethernet frame + overhead.
+ *
+ * Naturally: The higher the limit, the faster the device CAN send.
+ * However, even a slight over-commitment at the wrong time and the
+ * hardware is doomed to send all already-queued frames at suboptimal
+ * rates. This in turn leads to an enourmous amount of unsuccessful
+ * retries => Latency goes up, whereas the throughput goes down. CRASH!
+ */
+#define CARL9170_NUM_TX_LIMIT_HARD      ((AR9170_TXQ_DEPTH * 3) / 2)
+#define CARL9170_NUM_TX_LIMIT_SOFT      (AR9170_TXQ_DEPTH)
+
+struct carl9170_tx_queue_stats {
+        unsigned int count;
+        unsigned int limit;
+        unsigned int len;
+};
+
+struct carl9170_vif {
+        unsigned int id;
+        struct ieee80211_vif *vif;
+};
+
+struct carl9170_vif_info {
+        struct list_head list;
+        bool active;
+        unsigned int id;
+        struct sk_buff *beacon;
+        bool enable_beacon;
+};
+
+#define AR9170_NUM_RX_URBS      16
+#define AR9170_NUM_RX_URBS_MUL  2
+#define AR9170_NUM_TX_URBS      8
+#define AR9170_NUM_RX_URBS_POOL (AR9170_NUM_RX_URBS_MUL * AR9170_NUM_RX_URBS)
+
+enum carl9170_device_features {
+        CARL9170_WPS_BUTTON             = BIT(0),
+        CARL9170_ONE_LED                = BIT(1),
+};
+
+#ifdef CONFIG_CARL9170_LEDS
+struct ar9170;
+
+struct carl9170_led {
+        struct ar9170 *ar;
+        struct led_classdev l;
+        char name[32];
+        unsigned int toggled;
+        bool last_state;
+        bool registered;
+};
+#endif /* CONFIG_CARL9170_LEDS */
+
+enum carl9170_restart_reasons {
+        CARL9170_RR_NO_REASON = 0,
+        CARL9170_RR_FATAL_FIRMWARE_ERROR,
+        CARL9170_RR_TOO_MANY_FIRMWARE_ERRORS,
+        CARL9170_RR_WATCHDOG,
+        CARL9170_RR_STUCK_TX,
+        CARL9170_RR_SLOW_SYSTEM,
+        CARL9170_RR_COMMAND_TIMEOUT,
+        CARL9170_RR_TOO_MANY_PHY_ERRORS,
+        CARL9170_RR_LOST_RSP,
+        CARL9170_RR_INVALID_RSP,
+        CARL9170_RR_USER_REQUEST,
+
+        __CARL9170_RR_LAST,
+};
+
+enum carl9170_erp_modes {
+        CARL9170_ERP_INVALID,
+        CARL9170_ERP_AUTO,
+        CARL9170_ERP_MAC80211,
+        CARL9170_ERP_OFF,
+        CARL9170_ERP_CTS,
+        CARL9170_ERP_RTS,
+        __CARL9170_ERP_NUM,
+};
+
+struct ar9170 {
+        struct ath_common common;
+        struct ieee80211_hw *hw;
+        struct mutex mutex;
+        enum carl9170_device_state state;
+        spinlock_t state_lock;
+        enum carl9170_restart_reasons last_reason;
+        bool registered;
+
+        /* USB */
+        struct usb_device *udev;
+        struct usb_interface *intf;
+        struct usb_anchor rx_anch;
+        struct usb_anchor rx_work;
+        struct usb_anchor rx_pool;
+        struct usb_anchor tx_wait;
+        struct usb_anchor tx_anch;
+        struct usb_anchor tx_cmd;
+        struct usb_anchor tx_err;
+        struct tasklet_struct usb_tasklet;
+        atomic_t tx_cmd_urbs;
+        atomic_t tx_anch_urbs;
+        atomic_t rx_anch_urbs;
+        atomic_t rx_work_urbs;
+        atomic_t rx_pool_urbs;
+        kernel_ulong_t features;
+
+        /* firmware settings */
+        struct completion fw_load_wait;
+        struct completion fw_boot_wait;
+        struct {
+                const struct carl9170fw_desc_head *desc;
+                const struct firmware *fw;
+                unsigned int offset;
+                unsigned int address;
+                unsigned int cmd_bufs;
+                unsigned int api_version;
+                unsigned int vif_num;
+                unsigned int err_counter;
+                unsigned int bug_counter;
+                u32 beacon_addr;
+                unsigned int beacon_max_len;
+                bool rx_stream;
+                bool tx_stream;
+                unsigned int mem_blocks;
+                unsigned int mem_block_size;
+                unsigned int rx_size;
+        } fw;
+
+        /* reset / stuck frames/queue detection */
+        struct work_struct restart_work;
+        unsigned int restart_counter;
+        unsigned long queue_stop_timeout[__AR9170_NUM_TXQ];
+        unsigned long max_queue_stop_timeout[__AR9170_NUM_TXQ];
+        bool needs_full_reset;
+        atomic_t pending_restarts;
+
+        /* interface mode settings */
+        struct list_head vif_list;
+        unsigned long vif_bitmap;
+        unsigned int vifs;
+        struct carl9170_vif vif_priv[AR9170_MAX_VIRTUAL_MAC];
+
+        /* beaconing */
+        spinlock_t beacon_lock;
+        unsigned int global_pretbtt;
+        unsigned int global_beacon_int;
+        struct carl9170_vif_info *beacon_iter;
+        unsigned int beacon_enabled;
+
+        /* cryptographic engine */
+        u64 usedkeys;
+        bool rx_software_decryption;
+        bool disable_offload;
+
+        /* filter settings */
+        u64 cur_mc_hash;
+        u32 cur_filter;
+        unsigned int filter_state;
+        bool sniffer_enabled;
+
+        /* MAC */
+        enum carl9170_erp_modes erp_mode;
+
+        /* PHY */
+        struct ieee80211_channel *channel;
+        int noise[6];
+        unsigned int chan_fail;
+        unsigned int total_chan_fail;
+        u8 heavy_clip;
+
+        /* power calibration data */
+        u8 power_5G_leg[4];
+        u8 power_2G_cck[4];
+        u8 power_2G_ofdm[4];
+        u8 power_5G_ht20[8];
+        u8 power_5G_ht40[8];
+        u8 power_2G_ht20[8];
+        u8 power_2G_ht40[8];
+
+#ifdef CONFIG_CARL9170_LEDS
+        /* LED */
+        struct delayed_work led_work;
+        struct carl9170_led leds[AR9170_NUM_LEDS];
+#endif /* CONFIG_CARL9170_LEDS */
+
+        /* qos queue settings */
+        spinlock_t tx_stats_lock;
+        struct carl9170_tx_queue_stats tx_stats[__AR9170_NUM_TXQ];
+        struct ieee80211_tx_queue_params edcf[5];
+        struct completion tx_flush;
+
+        /* CMD */
+        int cmd_seq;
+        int readlen;
+        u8 *readbuf;
+        spinlock_t cmd_lock;
+        struct completion cmd_wait;
+        union {
+                __le32 cmd_buf[PAYLOAD_MAX + 1];
+                struct carl9170_cmd cmd;
+                struct carl9170_rsp rsp;
+        };
+
+        /* statistics */
+        unsigned int tx_dropped;
+        unsigned int tx_ack_failures;
+        unsigned int tx_fcs_errors;
+        unsigned int tx_ampdu_timeout;
+        unsigned int rx_dropped;
+
+        /* EEPROM */
+        struct ar9170_eeprom eeprom;
+
+        /* tx queuing */
+        struct sk_buff_head tx_pending[__AR9170_NUM_TXQ];
+        struct sk_buff_head tx_status[__AR9170_NUM_TXQ];
+        struct delayed_work tx_janitor;
+        unsigned long tx_janitor_last_run;
+        bool tx_schedule;
+
+        /* tx ampdu */
+        struct work_struct ampdu_work;
+        spinlock_t tx_ampdu_list_lock;
+        struct carl9170_sta_tid *tx_ampdu_iter;
+        struct list_head tx_ampdu_list;
+        atomic_t tx_ampdu_upload;
+        atomic_t tx_ampdu_scheduler;
+        atomic_t tx_total_pending;
+        atomic_t tx_total_queued;
+        unsigned int tx_ampdu_list_len;
+        int current_density;
+        int current_factor;
+        bool tx_ampdu_schedule;
+
+        /* internal memory management */
+        spinlock_t mem_lock;
+        unsigned long *mem_bitmap;
+        atomic_t mem_free_blocks;
+        atomic_t mem_allocs;
+
+        /* rxstream mpdu merge */
+        struct ar9170_rx_head rx_plcp;
+        bool rx_has_plcp;
+        struct sk_buff *rx_failover;
+        int rx_failover_missing;
+
+#ifdef CONFIG_CARL9170_WPC
+        struct {
+                bool pbc_state;
+                struct input_dev *pbc;
+                char name[32];
+                char phys[32];
+        } wps;
+#endif /* CONFIG_CARL9170_WPC */
+
+#ifdef CONFIG_CARL9170_DEBUGFS
+        struct carl9170_debug debug;
+        struct dentry *debug_dir;
+#endif /* CONFIG_CARL9170_DEBUGFS */
+
+        /* PSM */
+        struct work_struct ps_work;
+        struct {
+                unsigned int dtim_counter;
+                unsigned long last_beacon;
+                unsigned long last_action;
+                unsigned long last_slept;
+                unsigned int sleep_ms;
+                unsigned int off_override;
+                bool state;
+        } ps;
+};
+
+enum carl9170_ps_off_override_reasons {
+        PS_OFF_VIF      = BIT(0),
+        PS_OFF_BCN      = BIT(1),
+        PS_OFF_5GHZ     = BIT(2),
+};
+
+struct carl9170_ba_stats {
+        u8 ampdu_len;
+        u8 ampdu_ack_len;
+        bool clear;
+};
+
+struct carl9170_sta_info {
+        bool ht_sta;
+        unsigned int ampdu_max_len;
+        struct carl9170_sta_tid *agg[CARL9170_NUM_TID];
+        struct carl9170_ba_stats stats[CARL9170_NUM_TID];
+};
+
+struct carl9170_tx_info {
+        unsigned long timeout;
+        struct ar9170 *ar;
+        struct kref ref;
+};
+
+#define CHK_DEV_STATE(a, s)     (((struct ar9170 *)a)->state >= (s))
+#define IS_INITIALIZED(a)       (CHK_DEV_STATE(a, CARL9170_STOPPED))
+#define IS_ACCEPTING_CMD(a)     (CHK_DEV_STATE(a, CARL9170_IDLE))
+#define IS_STARTED(a)           (CHK_DEV_STATE(a, CARL9170_STARTED))
+
+static inline void __carl9170_set_state(struct ar9170 *ar,
+        enum carl9170_device_state newstate)
+{
+        ar->state = newstate;
+}
+
+static inline void carl9170_set_state(struct ar9170 *ar,
+        enum carl9170_device_state newstate)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&ar->state_lock, flags);
+        __carl9170_set_state(ar, newstate);
+        spin_unlock_irqrestore(&ar->state_lock, flags);
+}
+
+static inline void carl9170_set_state_when(struct ar9170 *ar,
+        enum carl9170_device_state min, enum carl9170_device_state newstate)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&ar->state_lock, flags);
+        if (CHK_DEV_STATE(ar, min))
+                __carl9170_set_state(ar, newstate);
+        spin_unlock_irqrestore(&ar->state_lock, flags);
+}
+
+/* exported interface */
+void *carl9170_alloc(size_t priv_size);
+int carl9170_register(struct ar9170 *ar);
+void carl9170_unregister(struct ar9170 *ar);
+void carl9170_free(struct ar9170 *ar);
+void carl9170_restart(struct ar9170 *ar, const enum carl9170_restart_reasons r);
+void carl9170_ps_check(struct ar9170 *ar);
+
+/* USB back-end */
+int carl9170_usb_open(struct ar9170 *ar);
+void carl9170_usb_stop(struct ar9170 *ar);
+void carl9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb);
+void carl9170_usb_handle_tx_err(struct ar9170 *ar);
+int carl9170_exec_cmd(struct ar9170 *ar, const enum carl9170_cmd_oids,
+                      u32 plen, void *payload, u32 rlen, void *resp);
+int __carl9170_exec_cmd(struct ar9170 *ar, struct carl9170_cmd *cmd,
+                        const bool free_buf);
+int carl9170_usb_restart(struct ar9170 *ar);
+void carl9170_usb_reset(struct ar9170 *ar);
+
+/* MAC */
+int carl9170_init_mac(struct ar9170 *ar);
+int carl9170_set_qos(struct ar9170 *ar);
+int carl9170_update_multicast(struct ar9170 *ar, const u64 mc_hast);
+int carl9170_mod_virtual_mac(struct ar9170 *ar, const unsigned int id,
+                             const u8 *mac);
+int carl9170_set_operating_mode(struct ar9170 *ar);
+int carl9170_set_beacon_timers(struct ar9170 *ar);
+int carl9170_set_dyn_sifs_ack(struct ar9170 *ar);
+int carl9170_set_rts_cts_rate(struct ar9170 *ar);
+int carl9170_set_ampdu_settings(struct ar9170 *ar);
+int carl9170_set_slot_time(struct ar9170 *ar);
+int carl9170_set_mac_rates(struct ar9170 *ar);
+int carl9170_set_hwretry_limit(struct ar9170 *ar, const u32 max_retry);
+int carl9170_update_beacon(struct ar9170 *ar, const bool submit);
+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);
+int carl9170_disable_key(struct ar9170 *ar, const u8 id);
+
+/* RX */
+void carl9170_rx(struct ar9170 *ar, void *buf, unsigned int len);
+void carl9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len);
+
+/* TX */
+int carl9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb);
+void carl9170_tx_janitor(struct work_struct *work);
+void carl9170_tx_process_status(struct ar9170 *ar,
+                                const struct carl9170_rsp *cmd);
+void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
+                        const bool success);
+void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb);
+void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb);
+void carl9170_tx_scheduler(struct ar9170 *ar);
+void carl9170_tx_get_skb(struct sk_buff *skb);
+int carl9170_tx_put_skb(struct sk_buff *skb);
+
+/* LEDs */
+#ifdef CONFIG_CARL9170_LEDS
+int carl9170_led_register(struct ar9170 *ar);
+void carl9170_led_unregister(struct ar9170 *ar);
+#endif /* CONFIG_CARL9170_LEDS */
+int carl9170_led_init(struct ar9170 *ar);
+int carl9170_led_set_state(struct ar9170 *ar, const u32 led_state);
+
+/* PHY / RF */
+int carl9170_set_channel(struct ar9170 *ar, struct ieee80211_channel *channel,
+        enum nl80211_channel_type bw, enum carl9170_rf_init_mode rfi);
+int carl9170_get_noisefloor(struct ar9170 *ar);
+
+/* FW */
+int carl9170_parse_firmware(struct ar9170 *ar);
+int carl9170_fw_fix_eeprom(struct ar9170 *ar);
+
+extern struct ieee80211_rate __carl9170_ratetable[];
+extern int modparam_noht;
+
+static inline struct ar9170 *carl9170_get_priv(struct carl9170_vif *carl_vif)
+{
+        return container_of(carl_vif, struct ar9170,
+                            vif_priv[carl_vif->id]);
+}
+
+static inline struct ieee80211_hdr *carl9170_get_hdr(struct sk_buff *skb)
+{
+        return (void *)((struct _carl9170_tx_superframe *)
+                skb->data)->frame_data;
+}
+
+static inline u16 get_seq_h(struct ieee80211_hdr *hdr)
+{
+        return le16_to_cpu(hdr->seq_ctrl) >> 4;
+}
+
+static inline u16 carl9170_get_seq(struct sk_buff *skb)
+{
+        return get_seq_h(carl9170_get_hdr(skb));
+}
+
+static inline u16 get_tid_h(struct ieee80211_hdr *hdr)
+{
+        return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK;
+}
+
+static inline u16 carl9170_get_tid(struct sk_buff *skb)
+{
+        return get_tid_h(carl9170_get_hdr(skb));
+}
+
+static inline struct ieee80211_vif *
+carl9170_get_vif(struct carl9170_vif_info *priv)
+{
+        return container_of((void *)priv, struct ieee80211_vif, drv_priv);
+}
+
+/* Protected by ar->mutex or RCU */
+static inline struct ieee80211_vif *carl9170_get_main_vif(struct ar9170 *ar)
+{
+        struct carl9170_vif_info *cvif;
+
+        list_for_each_entry_rcu(cvif, &ar->vif_list, list) {
+                if (cvif->active)
+                        return carl9170_get_vif(cvif);
+        }
+
+        return NULL;
+}
+
+static inline bool is_main_vif(struct ar9170 *ar, struct ieee80211_vif *vif)
+{
+        bool ret;
+
+        rcu_read_lock();
+        ret = (carl9170_get_main_vif(ar) == vif);
+        rcu_read_unlock();
+        return ret;
+}
+
+#endif /* __CARL9170_H */