1 /*
2  * Copyright (c) 2014 Redpine Signals Inc.
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <linux/etherdevice.h>
18 #include "rsi_debugfs.h"
19 #include "rsi_mgmt.h"
20 #include "rsi_sdio.h"
21 #include "rsi_common.h"
22 #include "rsi_ps.h"
23 
24 static const struct ieee80211_channel rsi_2ghz_channels[] = {
25 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2412,
26 	  .hw_value = 1 }, /* Channel 1 */
27 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2417,
28 	  .hw_value = 2 }, /* Channel 2 */
29 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2422,
30 	  .hw_value = 3 }, /* Channel 3 */
31 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2427,
32 	  .hw_value = 4 }, /* Channel 4 */
33 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2432,
34 	  .hw_value = 5 }, /* Channel 5 */
35 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2437,
36 	  .hw_value = 6 }, /* Channel 6 */
37 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2442,
38 	  .hw_value = 7 }, /* Channel 7 */
39 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2447,
40 	  .hw_value = 8 }, /* Channel 8 */
41 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2452,
42 	  .hw_value = 9 }, /* Channel 9 */
43 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2457,
44 	  .hw_value = 10 }, /* Channel 10 */
45 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2462,
46 	  .hw_value = 11 }, /* Channel 11 */
47 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2467,
48 	  .hw_value = 12 }, /* Channel 12 */
49 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2472,
50 	  .hw_value = 13 }, /* Channel 13 */
51 	{ .band = NL80211_BAND_2GHZ, .center_freq = 2484,
52 	  .hw_value = 14 }, /* Channel 14 */
53 };
54 
55 static const struct ieee80211_channel rsi_5ghz_channels[] = {
56 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5180,
57 	  .hw_value = 36,  }, /* Channel 36 */
58 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5200,
59 	  .hw_value = 40, }, /* Channel 40 */
60 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5220,
61 	  .hw_value = 44, }, /* Channel 44 */
62 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5240,
63 	  .hw_value = 48, }, /* Channel 48 */
64 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5260,
65 	  .hw_value = 52, }, /* Channel 52 */
66 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5280,
67 	  .hw_value = 56, }, /* Channel 56 */
68 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5300,
69 	  .hw_value = 60, }, /* Channel 60 */
70 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5320,
71 	  .hw_value = 64, }, /* Channel 64 */
72 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5500,
73 	  .hw_value = 100, }, /* Channel 100 */
74 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5520,
75 	  .hw_value = 104, }, /* Channel 104 */
76 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5540,
77 	  .hw_value = 108, }, /* Channel 108 */
78 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5560,
79 	  .hw_value = 112, }, /* Channel 112 */
80 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5580,
81 	  .hw_value = 116, }, /* Channel 116 */
82 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5600,
83 	  .hw_value = 120, }, /* Channel 120 */
84 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5620,
85 	  .hw_value = 124, }, /* Channel 124 */
86 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5640,
87 	  .hw_value = 128, }, /* Channel 128 */
88 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5660,
89 	  .hw_value = 132, }, /* Channel 132 */
90 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5680,
91 	  .hw_value = 136, }, /* Channel 136 */
92 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5700,
93 	  .hw_value = 140, }, /* Channel 140 */
94 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5745,
95 	  .hw_value = 149, }, /* Channel 149 */
96 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5765,
97 	  .hw_value = 153, }, /* Channel 153 */
98 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5785,
99 	  .hw_value = 157, }, /* Channel 157 */
100 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5805,
101 	  .hw_value = 161, }, /* Channel 161 */
102 	{ .band = NL80211_BAND_5GHZ, .center_freq = 5825,
103 	  .hw_value = 165, }, /* Channel 165 */
104 };
105 
106 struct ieee80211_rate rsi_rates[12] = {
107 	{ .bitrate = STD_RATE_01  * 5, .hw_value = RSI_RATE_1 },
108 	{ .bitrate = STD_RATE_02  * 5, .hw_value = RSI_RATE_2 },
109 	{ .bitrate = STD_RATE_5_5 * 5, .hw_value = RSI_RATE_5_5 },
110 	{ .bitrate = STD_RATE_11  * 5, .hw_value = RSI_RATE_11 },
111 	{ .bitrate = STD_RATE_06  * 5, .hw_value = RSI_RATE_6 },
112 	{ .bitrate = STD_RATE_09  * 5, .hw_value = RSI_RATE_9 },
113 	{ .bitrate = STD_RATE_12  * 5, .hw_value = RSI_RATE_12 },
114 	{ .bitrate = STD_RATE_18  * 5, .hw_value = RSI_RATE_18 },
115 	{ .bitrate = STD_RATE_24  * 5, .hw_value = RSI_RATE_24 },
116 	{ .bitrate = STD_RATE_36  * 5, .hw_value = RSI_RATE_36 },
117 	{ .bitrate = STD_RATE_48  * 5, .hw_value = RSI_RATE_48 },
118 	{ .bitrate = STD_RATE_54  * 5, .hw_value = RSI_RATE_54 },
119 };
120 
121 const u16 rsi_mcsrates[8] = {
122 	RSI_RATE_MCS0, RSI_RATE_MCS1, RSI_RATE_MCS2, RSI_RATE_MCS3,
123 	RSI_RATE_MCS4, RSI_RATE_MCS5, RSI_RATE_MCS6, RSI_RATE_MCS7
124 };
125 
126 static const u32 rsi_max_ap_stas[16] = {
127 	32,	/* 1 - Wi-Fi alone */
128 	0,	/* 2 */
129 	0,	/* 3 */
130 	0,	/* 4 - BT EDR alone */
131 	4,	/* 5 - STA + BT EDR */
132 	32,	/* 6 - AP + BT EDR */
133 	0,	/* 7 */
134 	0,	/* 8 - BT LE alone */
135 	4,	/* 9 - STA + BE LE */
136 	0,	/* 10 */
137 	0,	/* 11 */
138 	0,	/* 12 */
139 	1,	/* 13 - STA + BT Dual */
140 	4,	/* 14 - AP + BT Dual */
141 };
142 
143 static const struct ieee80211_iface_limit rsi_iface_limits[] = {
144 	{
145 		.max = 1,
146 		.types = BIT(NL80211_IFTYPE_STATION),
147 	},
148 	{
149 		.max = 1,
150 		.types = BIT(NL80211_IFTYPE_AP) |
151 			BIT(NL80211_IFTYPE_P2P_CLIENT) |
152 			BIT(NL80211_IFTYPE_P2P_GO),
153 	},
154 	{
155 		.max = 1,
156 		.types = BIT(NL80211_IFTYPE_P2P_DEVICE),
157 	},
158 };
159 
160 static const struct ieee80211_iface_combination rsi_iface_combinations[] = {
161 	{
162 		.num_different_channels = 1,
163 		.max_interfaces = 3,
164 		.limits = rsi_iface_limits,
165 		.n_limits = ARRAY_SIZE(rsi_iface_limits),
166 	},
167 };
168 
169 /**
170  * rsi_is_cipher_wep() -  This function determines if the cipher is WEP or not.
171  * @common: Pointer to the driver private structure.
172  *
173  * Return: If cipher type is WEP, a value of 1 is returned, else 0.
174  */
175 
176 bool rsi_is_cipher_wep(struct rsi_common *common)
177 {
178 	if (((common->secinfo.gtk_cipher == WLAN_CIPHER_SUITE_WEP104) ||
179 	     (common->secinfo.gtk_cipher == WLAN_CIPHER_SUITE_WEP40)) &&
180 	    (!common->secinfo.ptk_cipher))
181 		return true;
182 	else
183 		return false;
184 }
185 
186 /**
187  * rsi_register_rates_channels() - This function registers channels and rates.
188  * @adapter: Pointer to the adapter structure.
189  * @band: Operating band to be set.
190  *
191  * Return: int - 0 on success, negative error on failure.
192  */
193 static int rsi_register_rates_channels(struct rsi_hw *adapter, int band)
194 {
195 	struct ieee80211_supported_band *sbands = &adapter->sbands[band];
196 	void *channels = NULL;
197 
198 	if (band == NL80211_BAND_2GHZ) {
199 		channels = kmemdup(rsi_2ghz_channels, sizeof(rsi_2ghz_channels),
200 				   GFP_KERNEL);
201 		if (!channels)
202 			return -ENOMEM;
203 		sbands->band = NL80211_BAND_2GHZ;
204 		sbands->n_channels = ARRAY_SIZE(rsi_2ghz_channels);
205 		sbands->bitrates = rsi_rates;
206 		sbands->n_bitrates = ARRAY_SIZE(rsi_rates);
207 	} else {
208 		channels = kmemdup(rsi_5ghz_channels, sizeof(rsi_5ghz_channels),
209 				   GFP_KERNEL);
210 		if (!channels)
211 			return -ENOMEM;
212 		sbands->band = NL80211_BAND_5GHZ;
213 		sbands->n_channels = ARRAY_SIZE(rsi_5ghz_channels);
214 		sbands->bitrates = &rsi_rates[4];
215 		sbands->n_bitrates = ARRAY_SIZE(rsi_rates) - 4;
216 	}
217 
218 	sbands->channels = channels;
219 
220 	memset(&sbands->ht_cap, 0, sizeof(struct ieee80211_sta_ht_cap));
221 	sbands->ht_cap.ht_supported = true;
222 	sbands->ht_cap.cap = (IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
223 			      IEEE80211_HT_CAP_SGI_20 |
224 			      IEEE80211_HT_CAP_SGI_40);
225 	sbands->ht_cap.ampdu_factor = IEEE80211_HT_MAX_AMPDU_16K;
226 	sbands->ht_cap.ampdu_density = IEEE80211_HT_MPDU_DENSITY_NONE;
227 	sbands->ht_cap.mcs.rx_mask[0] = 0xff;
228 	sbands->ht_cap.mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
229 	/* sbands->ht_cap.mcs.rx_highest = 0x82; */
230 	return 0;
231 }
232 
233 static int rsi_mac80211_hw_scan_start(struct ieee80211_hw *hw,
234 				      struct ieee80211_vif *vif,
235 				      struct ieee80211_scan_request *hw_req)
236 {
237 	struct cfg80211_scan_request *scan_req = &hw_req->req;
238 	struct rsi_hw *adapter = hw->priv;
239 	struct rsi_common *common = adapter->priv;
240 	struct ieee80211_bss_conf *bss = &vif->bss_conf;
241 
242 	rsi_dbg(INFO_ZONE, "***** Hardware scan start *****\n");
243 	common->mac_ops_resumed = false;
244 
245 	if (common->fsm_state != FSM_MAC_INIT_DONE)
246 		return -ENODEV;
247 
248 	if ((common->wow_flags & RSI_WOW_ENABLED) ||
249 	    scan_req->n_channels == 0)
250 		return -EINVAL;
251 
252 	/* Scan already in progress. So return */
253 	if (common->bgscan_en)
254 		return -EBUSY;
255 
256 	/* If STA is not connected, return with special value 1, in order
257 	 * to start sw_scan in mac80211
258 	 */
259 	if (!bss->assoc)
260 		return 1;
261 
262 	mutex_lock(&common->mutex);
263 	common->hwscan = scan_req;
264 	if (!rsi_send_bgscan_params(common, RSI_START_BGSCAN)) {
265 		if (!rsi_send_bgscan_probe_req(common, vif)) {
266 			rsi_dbg(INFO_ZONE, "Background scan started...\n");
267 			common->bgscan_en = true;
268 		}
269 	}
270 	mutex_unlock(&common->mutex);
271 
272 	return 0;
273 }
274 
275 static void rsi_mac80211_cancel_hw_scan(struct ieee80211_hw *hw,
276 					struct ieee80211_vif *vif)
277 {
278 	struct rsi_hw *adapter = hw->priv;
279 	struct rsi_common *common = adapter->priv;
280 	struct cfg80211_scan_info info;
281 
282 	rsi_dbg(INFO_ZONE, "***** Hardware scan stop *****\n");
283 	mutex_lock(&common->mutex);
284 
285 	if (common->bgscan_en) {
286 		if (!rsi_send_bgscan_params(common, RSI_STOP_BGSCAN))
287 			common->bgscan_en = false;
288 		info.aborted = false;
289 		ieee80211_scan_completed(adapter->hw, &info);
290 		rsi_dbg(INFO_ZONE, "Back ground scan cancelled\n");
291 	}
292 	common->hwscan = NULL;
293 	mutex_unlock(&common->mutex);
294 }
295 
296 /**
297  * rsi_mac80211_detach() - This function is used to de-initialize the
298  *			   Mac80211 stack.
299  * @adapter: Pointer to the adapter structure.
300  *
301  * Return: None.
302  */
303 void rsi_mac80211_detach(struct rsi_hw *adapter)
304 {
305 	struct ieee80211_hw *hw = adapter->hw;
306 	enum nl80211_band band;
307 
308 	if (hw) {
309 		ieee80211_stop_queues(hw);
310 		ieee80211_unregister_hw(hw);
311 		ieee80211_free_hw(hw);
312 		adapter->hw = NULL;
313 	}
314 
315 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
316 		struct ieee80211_supported_band *sband =
317 					&adapter->sbands[band];
318 
319 		kfree(sband->channels);
320 	}
321 
322 #ifdef CONFIG_RSI_DEBUGFS
323 	rsi_remove_dbgfs(adapter);
324 	kfree(adapter->dfsentry);
325 #endif
326 }
327 EXPORT_SYMBOL_GPL(rsi_mac80211_detach);
328 
329 /**
330  * rsi_indicate_tx_status() - This function indicates the transmit status.
331  * @adapter: Pointer to the adapter structure.
332  * @skb: Pointer to the socket buffer structure.
333  * @status: Status
334  *
335  * Return: None.
336  */
337 void rsi_indicate_tx_status(struct rsi_hw *adapter,
338 			    struct sk_buff *skb,
339 			    int status)
340 {
341 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
342 	struct skb_info *tx_params;
343 
344 	if (!adapter->hw) {
345 		rsi_dbg(ERR_ZONE, "##### No MAC #####\n");
346 		return;
347 	}
348 
349 	if (!status)
350 		info->flags |= IEEE80211_TX_STAT_ACK;
351 
352 	tx_params = (struct skb_info *)info->driver_data;
353 	skb_pull(skb, tx_params->internal_hdr_size);
354 	memset(info->driver_data, 0, IEEE80211_TX_INFO_DRIVER_DATA_SIZE);
355 
356 	ieee80211_tx_status_irqsafe(adapter->hw, skb);
357 }
358 
359 /**
360  * rsi_mac80211_tx() - This is the handler that 802.11 module calls for each
361  *		       transmitted frame.SKB contains the buffer starting
362  *		       from the IEEE 802.11 header.
363  * @hw: Pointer to the ieee80211_hw structure.
364  * @control: Pointer to the ieee80211_tx_control structure
365  * @skb: Pointer to the socket buffer structure.
366  *
367  * Return: None
368  */
369 static void rsi_mac80211_tx(struct ieee80211_hw *hw,
370 			    struct ieee80211_tx_control *control,
371 			    struct sk_buff *skb)
372 {
373 	struct rsi_hw *adapter = hw->priv;
374 	struct rsi_common *common = adapter->priv;
375 	struct ieee80211_hdr *wlh = (struct ieee80211_hdr *)skb->data;
376 
377 	if (ieee80211_is_auth(wlh->frame_control))
378 		common->mac_ops_resumed = false;
379 
380 	rsi_core_xmit(common, skb);
381 }
382 
383 /**
384  * rsi_mac80211_start() - This is first handler that 802.11 module calls, since
385  *			  the driver init is complete by then, just
386  *			  returns success.
387  * @hw: Pointer to the ieee80211_hw structure.
388  *
389  * Return: 0 as success.
390  */
391 static int rsi_mac80211_start(struct ieee80211_hw *hw)
392 {
393 	struct rsi_hw *adapter = hw->priv;
394 	struct rsi_common *common = adapter->priv;
395 
396 	rsi_dbg(ERR_ZONE, "===> Interface UP <===\n");
397 	mutex_lock(&common->mutex);
398 	if (common->hibernate_resume) {
399 		common->reinit_hw = true;
400 		adapter->host_intf_ops->reinit_device(adapter);
401 		wait_for_completion(&adapter->priv->wlan_init_completion);
402 	}
403 	common->iface_down = false;
404 	wiphy_rfkill_start_polling(hw->wiphy);
405 	rsi_send_rx_filter_frame(common, 0);
406 	mutex_unlock(&common->mutex);
407 
408 	return 0;
409 }
410 
411 /**
412  * rsi_mac80211_stop() - This is the last handler that 802.11 module calls.
413  * @hw: Pointer to the ieee80211_hw structure.
414  *
415  * Return: None.
416  */
417 static void rsi_mac80211_stop(struct ieee80211_hw *hw)
418 {
419 	struct rsi_hw *adapter = hw->priv;
420 	struct rsi_common *common = adapter->priv;
421 
422 	rsi_dbg(ERR_ZONE, "===> Interface DOWN <===\n");
423 	mutex_lock(&common->mutex);
424 	common->iface_down = true;
425 	wiphy_rfkill_stop_polling(hw->wiphy);
426 
427 	/* Block all rx frames */
428 	rsi_send_rx_filter_frame(common, 0xffff);
429 
430 	mutex_unlock(&common->mutex);
431 }
432 
433 static int rsi_map_intf_mode(enum nl80211_iftype vif_type)
434 {
435 	switch (vif_type) {
436 	case NL80211_IFTYPE_STATION:
437 		return RSI_OPMODE_STA;
438 	case NL80211_IFTYPE_AP:
439 		return RSI_OPMODE_AP;
440 	case NL80211_IFTYPE_P2P_DEVICE:
441 		return RSI_OPMODE_P2P_CLIENT;
442 	case NL80211_IFTYPE_P2P_CLIENT:
443 		return RSI_OPMODE_P2P_CLIENT;
444 	case NL80211_IFTYPE_P2P_GO:
445 		return RSI_OPMODE_P2P_GO;
446 	default:
447 		return RSI_OPMODE_UNSUPPORTED;
448 	}
449 }
450 
451 /**
452  * rsi_mac80211_add_interface() - This function is called when a netdevice
453  *				  attached to the hardware is enabled.
454  * @hw: Pointer to the ieee80211_hw structure.
455  * @vif: Pointer to the ieee80211_vif structure.
456  *
457  * Return: ret: 0 on success, negative error code on failure.
458  */
459 static int rsi_mac80211_add_interface(struct ieee80211_hw *hw,
460 				      struct ieee80211_vif *vif)
461 {
462 	struct rsi_hw *adapter = hw->priv;
463 	struct rsi_common *common = adapter->priv;
464 	struct vif_priv *vif_info = (struct vif_priv *)vif->drv_priv;
465 	enum opmode intf_mode;
466 	enum vap_status vap_status;
467 	int vap_idx = -1, i;
468 
469 	vif->driver_flags |= IEEE80211_VIF_SUPPORTS_UAPSD;
470 	mutex_lock(&common->mutex);
471 
472 	intf_mode = rsi_map_intf_mode(vif->type);
473 	if (intf_mode == RSI_OPMODE_UNSUPPORTED) {
474 		rsi_dbg(ERR_ZONE,
475 			"%s: Interface type %d not supported\n", __func__,
476 			vif->type);
477 		mutex_unlock(&common->mutex);
478 		return -EOPNOTSUPP;
479 	}
480 	if ((vif->type == NL80211_IFTYPE_P2P_DEVICE) ||
481 	    (vif->type == NL80211_IFTYPE_P2P_CLIENT) ||
482 	    (vif->type == NL80211_IFTYPE_P2P_GO))
483 		common->p2p_enabled = true;
484 
485 	/* Get free vap index */
486 	for (i = 0; i < RSI_MAX_VIFS; i++) {
487 		if (!adapter->vifs[i] ||
488 		    !memcmp(vif->addr, adapter->vifs[i]->addr, ETH_ALEN)) {
489 			vap_idx = i;
490 			break;
491 		}
492 	}
493 	if (vap_idx < 0) {
494 		rsi_dbg(ERR_ZONE, "Reject: Max VAPs reached\n");
495 		mutex_unlock(&common->mutex);
496 		return -EOPNOTSUPP;
497 	}
498 	vif_info->vap_id = vap_idx;
499 	adapter->vifs[vap_idx] = vif;
500 	adapter->sc_nvifs++;
501 	vap_status = VAP_ADD;
502 
503 	if (rsi_set_vap_capabilities(common, intf_mode, vif->addr,
504 				     vif_info->vap_id, vap_status)) {
505 		rsi_dbg(ERR_ZONE, "Failed to set VAP capabilities\n");
506 		mutex_unlock(&common->mutex);
507 		return -EINVAL;
508 	}
509 
510 	if ((vif->type == NL80211_IFTYPE_AP) ||
511 	    (vif->type == NL80211_IFTYPE_P2P_GO)) {
512 		rsi_send_rx_filter_frame(common, DISALLOW_BEACONS);
513 		for (i = 0; i < common->max_stations; i++)
514 			common->stations[i].sta = NULL;
515 	}
516 
517 	mutex_unlock(&common->mutex);
518 
519 	return 0;
520 }
521 
522 /**
523  * rsi_mac80211_remove_interface() - This function notifies driver that an
524  *				     interface is going down.
525  * @hw: Pointer to the ieee80211_hw structure.
526  * @vif: Pointer to the ieee80211_vif structure.
527  *
528  * Return: None.
529  */
530 static void rsi_mac80211_remove_interface(struct ieee80211_hw *hw,
531 					  struct ieee80211_vif *vif)
532 {
533 	struct rsi_hw *adapter = hw->priv;
534 	struct rsi_common *common = adapter->priv;
535 	enum opmode opmode;
536 	int i;
537 
538 	rsi_dbg(INFO_ZONE, "Remove Interface Called\n");
539 
540 	mutex_lock(&common->mutex);
541 
542 	if (adapter->sc_nvifs <= 0) {
543 		mutex_unlock(&common->mutex);
544 		return;
545 	}
546 
547 	opmode = rsi_map_intf_mode(vif->type);
548 	if (opmode == RSI_OPMODE_UNSUPPORTED) {
549 		rsi_dbg(ERR_ZONE, "Opmode error : %d\n", opmode);
550 		mutex_unlock(&common->mutex);
551 		return;
552 	}
553 	for (i = 0; i < RSI_MAX_VIFS; i++) {
554 		if (!adapter->vifs[i])
555 			continue;
556 		if (vif == adapter->vifs[i]) {
557 			rsi_set_vap_capabilities(common, opmode, vif->addr,
558 						 i, VAP_DELETE);
559 			adapter->sc_nvifs--;
560 			adapter->vifs[i] = NULL;
561 		}
562 	}
563 	mutex_unlock(&common->mutex);
564 }
565 
566 /**
567  * rsi_channel_change() - This function is a performs the checks
568  *			  required for changing a channel and sets
569  *			  the channel accordingly.
570  * @hw: Pointer to the ieee80211_hw structure.
571  *
572  * Return: 0 on success, negative error code on failure.
573  */
574 static int rsi_channel_change(struct ieee80211_hw *hw)
575 {
576 	struct rsi_hw *adapter = hw->priv;
577 	struct rsi_common *common = adapter->priv;
578 	int status = -EOPNOTSUPP;
579 	struct ieee80211_channel *curchan = hw->conf.chandef.chan;
580 	u16 channel = curchan->hw_value;
581 	struct ieee80211_vif *vif;
582 	struct ieee80211_bss_conf *bss;
583 	bool assoc = false;
584 	int i;
585 
586 	rsi_dbg(INFO_ZONE,
587 		"%s: Set channel: %d MHz type: %d channel_no %d\n",
588 		__func__, curchan->center_freq,
589 		curchan->flags, channel);
590 
591 	for (i = 0; i < RSI_MAX_VIFS; i++) {
592 		vif = adapter->vifs[i];
593 		if (!vif)
594 			continue;
595 		if (vif->type == NL80211_IFTYPE_STATION) {
596 			bss = &vif->bss_conf;
597 			if (bss->assoc) {
598 				assoc = true;
599 				break;
600 			}
601 		}
602 	}
603 	if (assoc) {
604 		if (!common->hw_data_qs_blocked &&
605 		    (rsi_get_connected_channel(vif) != channel)) {
606 			rsi_dbg(INFO_ZONE, "blk data q %d\n", channel);
607 			if (!rsi_send_block_unblock_frame(common, true))
608 				common->hw_data_qs_blocked = true;
609 		}
610 	}
611 
612 	status = rsi_band_check(common, curchan);
613 	if (!status)
614 		status = rsi_set_channel(adapter->priv, curchan);
615 
616 	if (assoc) {
617 		if (common->hw_data_qs_blocked &&
618 		    (rsi_get_connected_channel(vif) == channel)) {
619 			rsi_dbg(INFO_ZONE, "unblk data q %d\n", channel);
620 			if (!rsi_send_block_unblock_frame(common, false))
621 				common->hw_data_qs_blocked = false;
622 		}
623 	}
624 
625 	return status;
626 }
627 
628 /**
629  * rsi_config_power() - This function configures tx power to device
630  * @hw: Pointer to the ieee80211_hw structure.
631  *
632  * Return: 0 on success, negative error code on failure.
633  */
634 static int rsi_config_power(struct ieee80211_hw *hw)
635 {
636 	struct rsi_hw *adapter = hw->priv;
637 	struct rsi_common *common = adapter->priv;
638 	struct ieee80211_conf *conf = &hw->conf;
639 
640 	if (adapter->sc_nvifs <= 0) {
641 		rsi_dbg(ERR_ZONE, "%s: No virtual interface found\n", __func__);
642 		return -EINVAL;
643 	}
644 
645 	rsi_dbg(INFO_ZONE,
646 		"%s: Set tx power: %d dBM\n", __func__, conf->power_level);
647 
648 	if (conf->power_level == common->tx_power)
649 		return 0;
650 
651 	common->tx_power = conf->power_level;
652 
653 	return rsi_send_radio_params_update(common);
654 }
655 
656 /**
657  * rsi_mac80211_config() - This function is a handler for configuration
658  *			   requests. The stack calls this function to
659  *			   change hardware configuration, e.g., channel.
660  * @hw: Pointer to the ieee80211_hw structure.
661  * @changed: Changed flags set.
662  *
663  * Return: 0 on success, negative error code on failure.
664  */
665 static int rsi_mac80211_config(struct ieee80211_hw *hw,
666 			       u32 changed)
667 {
668 	struct rsi_hw *adapter = hw->priv;
669 	struct rsi_common *common = adapter->priv;
670 	struct ieee80211_conf *conf = &hw->conf;
671 	int status = -EOPNOTSUPP;
672 
673 	mutex_lock(&common->mutex);
674 
675 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL)
676 		status = rsi_channel_change(hw);
677 
678 	/* tx power */
679 	if (changed & IEEE80211_CONF_CHANGE_POWER) {
680 		rsi_dbg(INFO_ZONE, "%s: Configuring Power\n", __func__);
681 		status = rsi_config_power(hw);
682 	}
683 
684 	/* Power save parameters */
685 	if ((changed & IEEE80211_CONF_CHANGE_PS) &&
686 	    !common->mac_ops_resumed) {
687 		struct ieee80211_vif *vif, *sta_vif = NULL;
688 		unsigned long flags;
689 		int i, set_ps = 1;
690 
691 		for (i = 0; i < RSI_MAX_VIFS; i++) {
692 			vif = adapter->vifs[i];
693 			if (!vif)
694 				continue;
695 			/* Don't go to power save if AP vap exists */
696 			if ((vif->type == NL80211_IFTYPE_AP) ||
697 			    (vif->type == NL80211_IFTYPE_P2P_GO)) {
698 				set_ps = 0;
699 				break;
700 			}
701 			if ((vif->type == NL80211_IFTYPE_STATION ||
702 			     vif->type == NL80211_IFTYPE_P2P_CLIENT) &&
703 			    (!sta_vif || vif->bss_conf.assoc))
704 				sta_vif = vif;
705 		}
706 		if (set_ps && sta_vif) {
707 			spin_lock_irqsave(&adapter->ps_lock, flags);
708 			if (conf->flags & IEEE80211_CONF_PS)
709 				rsi_enable_ps(adapter, sta_vif);
710 			else
711 				rsi_disable_ps(adapter, sta_vif);
712 			spin_unlock_irqrestore(&adapter->ps_lock, flags);
713 		}
714 	}
715 
716 	/* RTS threshold */
717 	if (changed & WIPHY_PARAM_RTS_THRESHOLD) {
718 		rsi_dbg(INFO_ZONE, "RTS threshold\n");
719 		if ((common->rts_threshold) <= IEEE80211_MAX_RTS_THRESHOLD) {
720 			rsi_dbg(INFO_ZONE,
721 				"%s: Sending vap updates....\n", __func__);
722 			status = rsi_send_vap_dynamic_update(common);
723 		}
724 	}
725 	mutex_unlock(&common->mutex);
726 
727 	return status;
728 }
729 
730 /**
731  * rsi_get_connected_channel() - This function is used to get the current
732  *				 connected channel number.
733  * @vif: Pointer to the ieee80211_vif structure.
734  *
735  * Return: Current connected AP's channel number is returned.
736  */
737 u16 rsi_get_connected_channel(struct ieee80211_vif *vif)
738 {
739 	struct ieee80211_bss_conf *bss;
740 	struct ieee80211_channel *channel;
741 
742 	if (!vif)
743 		return 0;
744 
745 	bss = &vif->bss_conf;
746 	channel = bss->chandef.chan;
747 
748 	if (!channel)
749 		return 0;
750 
751 	return channel->hw_value;
752 }
753 
754 static void rsi_switch_channel(struct rsi_hw *adapter,
755 			       struct ieee80211_vif *vif)
756 {
757 	struct rsi_common *common = adapter->priv;
758 	struct ieee80211_channel *channel;
759 
760 	if (common->iface_down)
761 		return;
762 	if (!vif)
763 		return;
764 
765 	channel = vif->bss_conf.chandef.chan;
766 
767 	if (!channel)
768 		return;
769 
770 	rsi_band_check(common, channel);
771 	rsi_set_channel(common, channel);
772 	rsi_dbg(INFO_ZONE, "Switched to channel - %d\n", channel->hw_value);
773 }
774 
775 /**
776  * rsi_mac80211_bss_info_changed() - This function is a handler for config
777  *				     requests related to BSS parameters that
778  *				     may vary during BSS's lifespan.
779  * @hw: Pointer to the ieee80211_hw structure.
780  * @vif: Pointer to the ieee80211_vif structure.
781  * @bss_conf: Pointer to the ieee80211_bss_conf structure.
782  * @changed: Changed flags set.
783  *
784  * Return: None.
785  */
786 static void rsi_mac80211_bss_info_changed(struct ieee80211_hw *hw,
787 					  struct ieee80211_vif *vif,
788 					  struct ieee80211_bss_conf *bss_conf,
789 					  u32 changed)
790 {
791 	struct rsi_hw *adapter = hw->priv;
792 	struct rsi_common *common = adapter->priv;
793 	struct ieee80211_bss_conf *bss = &vif->bss_conf;
794 	struct ieee80211_conf *conf = &hw->conf;
795 	u16 rx_filter_word = 0;
796 
797 	mutex_lock(&common->mutex);
798 	if (changed & BSS_CHANGED_ASSOC) {
799 		rsi_dbg(INFO_ZONE, "%s: Changed Association status: %d\n",
800 			__func__, bss_conf->assoc);
801 		if (bss_conf->assoc) {
802 			/* Send the RX filter frame */
803 			rx_filter_word = (ALLOW_DATA_ASSOC_PEER |
804 					  ALLOW_CTRL_ASSOC_PEER |
805 					  ALLOW_MGMT_ASSOC_PEER);
806 			rsi_send_rx_filter_frame(common, rx_filter_word);
807 		}
808 		rsi_inform_bss_status(common,
809 				      RSI_OPMODE_STA,
810 				      bss_conf->assoc,
811 				      bss_conf->bssid,
812 				      bss_conf->qos,
813 				      bss_conf->aid,
814 				      NULL, 0,
815 				      bss_conf->assoc_capability, vif);
816 		adapter->ps_info.dtim_interval_duration = bss->dtim_period;
817 		adapter->ps_info.listen_interval = conf->listen_interval;
818 
819 		/* If U-APSD is updated, send ps parameters to firmware */
820 		if (bss->assoc) {
821 			if (common->uapsd_bitmap) {
822 				rsi_dbg(INFO_ZONE, "Configuring UAPSD\n");
823 				rsi_conf_uapsd(adapter, vif);
824 			}
825 		} else {
826 			common->uapsd_bitmap = 0;
827 		}
828 	}
829 
830 	if (changed & BSS_CHANGED_CQM) {
831 		common->cqm_info.last_cqm_event_rssi = 0;
832 		common->cqm_info.rssi_thold = bss_conf->cqm_rssi_thold;
833 		common->cqm_info.rssi_hyst = bss_conf->cqm_rssi_hyst;
834 		rsi_dbg(INFO_ZONE, "RSSI threshold & hysteresis are: %d %d\n",
835 			common->cqm_info.rssi_thold,
836 			common->cqm_info.rssi_hyst);
837 	}
838 
839 	if (changed & BSS_CHANGED_BEACON_INT) {
840 		rsi_dbg(INFO_ZONE, "%s: Changed Beacon interval: %d\n",
841 			__func__, bss_conf->beacon_int);
842 		if (common->beacon_interval != bss->beacon_int) {
843 			common->beacon_interval = bss->beacon_int;
844 			if (vif->type == NL80211_IFTYPE_AP) {
845 				struct vif_priv *vif_info = (struct vif_priv *)vif->drv_priv;
846 
847 				rsi_set_vap_capabilities(common, RSI_OPMODE_AP,
848 							 vif->addr, vif_info->vap_id,
849 							 VAP_UPDATE);
850 			}
851 		}
852 		adapter->ps_info.listen_interval =
853 			bss->beacon_int * adapter->ps_info.num_bcns_per_lis_int;
854 	}
855 
856 	if ((changed & BSS_CHANGED_BEACON_ENABLED) &&
857 	    ((vif->type == NL80211_IFTYPE_AP) ||
858 	     (vif->type == NL80211_IFTYPE_P2P_GO))) {
859 		if (bss->enable_beacon) {
860 			rsi_dbg(INFO_ZONE, "===> BEACON ENABLED <===\n");
861 			common->beacon_enabled = 1;
862 		} else {
863 			rsi_dbg(INFO_ZONE, "===> BEACON DISABLED <===\n");
864 			common->beacon_enabled = 0;
865 		}
866 	}
867 
868 	mutex_unlock(&common->mutex);
869 }
870 
871 /**
872  * rsi_mac80211_conf_filter() - This function configure the device's RX filter.
873  * @hw: Pointer to the ieee80211_hw structure.
874  * @changed_flags: Changed flags set.
875  * @total_flags: Total initial flags set.
876  * @multicast: Multicast.
877  *
878  * Return: None.
879  */
880 static void rsi_mac80211_conf_filter(struct ieee80211_hw *hw,
881 				     u32 changed_flags,
882 				     u32 *total_flags,
883 				     u64 multicast)
884 {
885 	/* Not doing much here as of now */
886 	*total_flags &= RSI_SUPP_FILTERS;
887 }
888 
889 /**
890  * rsi_mac80211_conf_tx() - This function configures TX queue parameters
891  *			    (EDCF (aifs, cw_min, cw_max), bursting)
892  *			    for a hardware TX queue.
893  * @hw: Pointer to the ieee80211_hw structure
894  * @vif: Pointer to the ieee80211_vif structure.
895  * @queue: Queue number.
896  * @params: Pointer to ieee80211_tx_queue_params structure.
897  *
898  * Return: 0 on success, negative error code on failure.
899  */
900 static int rsi_mac80211_conf_tx(struct ieee80211_hw *hw,
901 				struct ieee80211_vif *vif, u16 queue,
902 				const struct ieee80211_tx_queue_params *params)
903 {
904 	struct rsi_hw *adapter = hw->priv;
905 	struct rsi_common *common = adapter->priv;
906 	u8 idx = 0;
907 
908 	if (queue >= IEEE80211_NUM_ACS)
909 		return 0;
910 
911 	rsi_dbg(INFO_ZONE,
912 		"%s: Conf queue %d, aifs: %d, cwmin: %d cwmax: %d, txop: %d\n",
913 		__func__, queue, params->aifs,
914 		params->cw_min, params->cw_max, params->txop);
915 
916 	mutex_lock(&common->mutex);
917 	/* Map into the way the f/w expects */
918 	switch (queue) {
919 	case IEEE80211_AC_VO:
920 		idx = VO_Q;
921 		break;
922 	case IEEE80211_AC_VI:
923 		idx = VI_Q;
924 		break;
925 	case IEEE80211_AC_BE:
926 		idx = BE_Q;
927 		break;
928 	case IEEE80211_AC_BK:
929 		idx = BK_Q;
930 		break;
931 	default:
932 		idx = BE_Q;
933 		break;
934 	}
935 
936 	memcpy(&common->edca_params[idx],
937 	       params,
938 	       sizeof(struct ieee80211_tx_queue_params));
939 
940 	if (params->uapsd)
941 		common->uapsd_bitmap |= idx;
942 	else
943 		common->uapsd_bitmap &= (~idx);
944 
945 	mutex_unlock(&common->mutex);
946 
947 	return 0;
948 }
949 
950 /**
951  * rsi_hal_key_config() - This function loads the keys into the firmware.
952  * @hw: Pointer to the ieee80211_hw structure.
953  * @vif: Pointer to the ieee80211_vif structure.
954  * @key: Pointer to the ieee80211_key_conf structure.
955  * @sta: Pointer to the ieee80211_sta structure.
956  *
957  * Return: status: 0 on success, negative error codes on failure.
958  */
959 static int rsi_hal_key_config(struct ieee80211_hw *hw,
960 			      struct ieee80211_vif *vif,
961 			      struct ieee80211_key_conf *key,
962 			      struct ieee80211_sta *sta)
963 {
964 	struct rsi_hw *adapter = hw->priv;
965 	struct rsi_sta *rsta = NULL;
966 	int status;
967 	u8 key_type;
968 	s16 sta_id = 0;
969 
970 	if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
971 		key_type = RSI_PAIRWISE_KEY;
972 	else
973 		key_type = RSI_GROUP_KEY;
974 
975 	rsi_dbg(ERR_ZONE, "%s: Cipher 0x%x key_type: %d key_len: %d\n",
976 		__func__, key->cipher, key_type, key->keylen);
977 
978 	if ((vif->type == NL80211_IFTYPE_AP) ||
979 	    (vif->type == NL80211_IFTYPE_P2P_GO)) {
980 		if (sta) {
981 			rsta = rsi_find_sta(adapter->priv, sta->addr);
982 			if (rsta)
983 				sta_id = rsta->sta_id;
984 		}
985 		adapter->priv->key = key;
986 	} else {
987 		if ((key->cipher == WLAN_CIPHER_SUITE_WEP104) ||
988 		    (key->cipher == WLAN_CIPHER_SUITE_WEP40)) {
989 			status = rsi_hal_load_key(adapter->priv,
990 						  key->key,
991 						  key->keylen,
992 						  RSI_PAIRWISE_KEY,
993 						  key->keyidx,
994 						  key->cipher,
995 						  sta_id,
996 						  vif);
997 			if (status)
998 				return status;
999 		}
1000 	}
1001 
1002 	status = rsi_hal_load_key(adapter->priv,
1003 				  key->key,
1004 				  key->keylen,
1005 				  key_type,
1006 				  key->keyidx,
1007 				  key->cipher,
1008 				  sta_id,
1009 				  vif);
1010 	if (status)
1011 		return status;
1012 
1013 	if (vif->type == NL80211_IFTYPE_STATION &&
1014 	    (key->cipher == WLAN_CIPHER_SUITE_WEP104 ||
1015 	     key->cipher == WLAN_CIPHER_SUITE_WEP40)) {
1016 		if (!rsi_send_block_unblock_frame(adapter->priv, false))
1017 			adapter->priv->hw_data_qs_blocked = false;
1018 	}
1019 
1020 	return 0;
1021 }
1022 
1023 /**
1024  * rsi_mac80211_set_key() - This function sets type of key to be loaded.
1025  * @hw: Pointer to the ieee80211_hw structure.
1026  * @cmd: enum set_key_cmd.
1027  * @vif: Pointer to the ieee80211_vif structure.
1028  * @sta: Pointer to the ieee80211_sta structure.
1029  * @key: Pointer to the ieee80211_key_conf structure.
1030  *
1031  * Return: status: 0 on success, negative error code on failure.
1032  */
1033 static int rsi_mac80211_set_key(struct ieee80211_hw *hw,
1034 				enum set_key_cmd cmd,
1035 				struct ieee80211_vif *vif,
1036 				struct ieee80211_sta *sta,
1037 				struct ieee80211_key_conf *key)
1038 {
1039 	struct rsi_hw *adapter = hw->priv;
1040 	struct rsi_common *common = adapter->priv;
1041 	struct security_info *secinfo = &common->secinfo;
1042 	int status;
1043 
1044 	mutex_lock(&common->mutex);
1045 	switch (cmd) {
1046 	case SET_KEY:
1047 		status = rsi_hal_key_config(hw, vif, key, sta);
1048 		if (status) {
1049 			mutex_unlock(&common->mutex);
1050 			return status;
1051 		}
1052 
1053 		if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
1054 			secinfo->ptk_cipher = key->cipher;
1055 		else
1056 			secinfo->gtk_cipher = key->cipher;
1057 
1058 		key->hw_key_idx = key->keyidx;
1059 		key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
1060 
1061 		rsi_dbg(ERR_ZONE, "%s: RSI set_key\n", __func__);
1062 		break;
1063 
1064 	case DISABLE_KEY:
1065 		rsi_dbg(ERR_ZONE, "%s: RSI del key\n", __func__);
1066 		memset(key, 0, sizeof(struct ieee80211_key_conf));
1067 		status = rsi_hal_key_config(hw, vif, key, sta);
1068 		break;
1069 
1070 	default:
1071 		status = -EOPNOTSUPP;
1072 		break;
1073 	}
1074 
1075 	mutex_unlock(&common->mutex);
1076 	return status;
1077 }
1078 
1079 /**
1080  * rsi_mac80211_ampdu_action() - This function selects the AMPDU action for
1081  *				 the corresponding mlme_action flag and
1082  *				 informs the f/w regarding this.
1083  * @hw: Pointer to the ieee80211_hw structure.
1084  * @vif: Pointer to the ieee80211_vif structure.
1085  * @params: Pointer to A-MPDU action parameters
1086  *
1087  * Return: status: 0 on success, negative error code on failure.
1088  */
1089 static int rsi_mac80211_ampdu_action(struct ieee80211_hw *hw,
1090 				     struct ieee80211_vif *vif,
1091 				     struct ieee80211_ampdu_params *params)
1092 {
1093 	int status = -EOPNOTSUPP;
1094 	struct rsi_hw *adapter = hw->priv;
1095 	struct rsi_common *common = adapter->priv;
1096 	struct rsi_sta *rsta = NULL;
1097 	u16 seq_no = 0, seq_start = 0;
1098 	u8 ii = 0;
1099 	struct ieee80211_sta *sta = params->sta;
1100 	u8 sta_id = 0;
1101 	enum ieee80211_ampdu_mlme_action action = params->action;
1102 	u16 tid = params->tid;
1103 	u16 *ssn = &params->ssn;
1104 	u8 buf_size = params->buf_size;
1105 
1106 	for (ii = 0; ii < RSI_MAX_VIFS; ii++) {
1107 		if (vif == adapter->vifs[ii])
1108 			break;
1109 	}
1110 
1111 	if (ii >= RSI_MAX_VIFS)
1112 		return status;
1113 
1114 	mutex_lock(&common->mutex);
1115 
1116 	if (ssn != NULL)
1117 		seq_no = *ssn;
1118 
1119 	if ((vif->type == NL80211_IFTYPE_AP) ||
1120 	    (vif->type == NL80211_IFTYPE_P2P_GO)) {
1121 		rsta = rsi_find_sta(common, sta->addr);
1122 		if (!rsta) {
1123 			rsi_dbg(ERR_ZONE, "No station mapped\n");
1124 			status = 0;
1125 			goto unlock;
1126 		}
1127 		sta_id = rsta->sta_id;
1128 	}
1129 
1130 	rsi_dbg(INFO_ZONE,
1131 		"%s: AMPDU action tid=%d ssn=0x%x, buf_size=%d sta_id=%d\n",
1132 		__func__, tid, seq_no, buf_size, sta_id);
1133 
1134 	switch (action) {
1135 	case IEEE80211_AMPDU_RX_START:
1136 		status = rsi_send_aggregation_params_frame(common,
1137 							   tid,
1138 							   seq_no,
1139 							   buf_size,
1140 							   STA_RX_ADDBA_DONE,
1141 							   sta_id);
1142 		break;
1143 
1144 	case IEEE80211_AMPDU_RX_STOP:
1145 		status = rsi_send_aggregation_params_frame(common,
1146 							   tid,
1147 							   0,
1148 							   buf_size,
1149 							   STA_RX_DELBA,
1150 							   sta_id);
1151 		break;
1152 
1153 	case IEEE80211_AMPDU_TX_START:
1154 		if ((vif->type == NL80211_IFTYPE_STATION) ||
1155 		    (vif->type == NL80211_IFTYPE_P2P_CLIENT))
1156 			common->vif_info[ii].seq_start = seq_no;
1157 		else if ((vif->type == NL80211_IFTYPE_AP) ||
1158 			 (vif->type == NL80211_IFTYPE_P2P_GO))
1159 			rsta->seq_start[tid] = seq_no;
1160 		status = IEEE80211_AMPDU_TX_START_IMMEDIATE;
1161 		break;
1162 
1163 	case IEEE80211_AMPDU_TX_STOP_CONT:
1164 	case IEEE80211_AMPDU_TX_STOP_FLUSH:
1165 	case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
1166 		status = rsi_send_aggregation_params_frame(common,
1167 							   tid,
1168 							   seq_no,
1169 							   buf_size,
1170 							   STA_TX_DELBA,
1171 							   sta_id);
1172 		if (!status)
1173 			ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1174 		break;
1175 
1176 	case IEEE80211_AMPDU_TX_OPERATIONAL:
1177 		if ((vif->type == NL80211_IFTYPE_STATION) ||
1178 		    (vif->type == NL80211_IFTYPE_P2P_CLIENT))
1179 			seq_start = common->vif_info[ii].seq_start;
1180 		else if ((vif->type == NL80211_IFTYPE_AP) ||
1181 			 (vif->type == NL80211_IFTYPE_P2P_GO))
1182 			seq_start = rsta->seq_start[tid];
1183 		status = rsi_send_aggregation_params_frame(common,
1184 							   tid,
1185 							   seq_start,
1186 							   buf_size,
1187 							   STA_TX_ADDBA_DONE,
1188 							   sta_id);
1189 		break;
1190 
1191 	default:
1192 		rsi_dbg(ERR_ZONE, "%s: Unknown AMPDU action\n", __func__);
1193 		break;
1194 	}
1195 
1196 unlock:
1197 	mutex_unlock(&common->mutex);
1198 	return status;
1199 }
1200 
1201 /**
1202  * rsi_mac80211_set_rts_threshold() - This function sets rts threshold value.
1203  * @hw: Pointer to the ieee80211_hw structure.
1204  * @value: Rts threshold value.
1205  *
1206  * Return: 0 on success.
1207  */
1208 static int rsi_mac80211_set_rts_threshold(struct ieee80211_hw *hw,
1209 					  u32 value)
1210 {
1211 	struct rsi_hw *adapter = hw->priv;
1212 	struct rsi_common *common = adapter->priv;
1213 
1214 	mutex_lock(&common->mutex);
1215 	common->rts_threshold = value;
1216 	mutex_unlock(&common->mutex);
1217 
1218 	return 0;
1219 }
1220 
1221 /**
1222  * rsi_mac80211_set_rate_mask() - This function sets bitrate_mask to be used.
1223  * @hw: Pointer to the ieee80211_hw structure
1224  * @vif: Pointer to the ieee80211_vif structure.
1225  * @mask: Pointer to the cfg80211_bitrate_mask structure.
1226  *
1227  * Return: 0 on success.
1228  */
1229 static int rsi_mac80211_set_rate_mask(struct ieee80211_hw *hw,
1230 				      struct ieee80211_vif *vif,
1231 				      const struct cfg80211_bitrate_mask *mask)
1232 {
1233 	const unsigned int mcs_offset = ARRAY_SIZE(rsi_rates);
1234 	struct rsi_hw *adapter = hw->priv;
1235 	struct rsi_common *common = adapter->priv;
1236 	int i;
1237 
1238 	mutex_lock(&common->mutex);
1239 
1240 	for (i = 0; i < ARRAY_SIZE(common->rate_config); i++) {
1241 		struct rsi_rate_config *cfg = &common->rate_config[i];
1242 		u32 bm;
1243 
1244 		bm = mask->control[i].legacy | (mask->control[i].ht_mcs[0] << mcs_offset);
1245 		if (hweight32(bm) == 1) { /* single rate */
1246 			int rate_index = ffs(bm) - 1;
1247 
1248 			if (rate_index < mcs_offset)
1249 				cfg->fixed_hw_rate = rsi_rates[rate_index].hw_value;
1250 			else
1251 				cfg->fixed_hw_rate = rsi_mcsrates[rate_index - mcs_offset];
1252 			cfg->fixed_enabled = true;
1253 		} else {
1254 			cfg->configured_mask = bm;
1255 			cfg->fixed_enabled = false;
1256 		}
1257 	}
1258 
1259 	mutex_unlock(&common->mutex);
1260 
1261 	return 0;
1262 }
1263 
1264 /**
1265  * rsi_perform_cqm() - This function performs cqm.
1266  * @common: Pointer to the driver private structure.
1267  * @bssid: pointer to the bssid.
1268  * @rssi: RSSI value.
1269  * @vif: Pointer to the ieee80211_vif structure.
1270  */
1271 static void rsi_perform_cqm(struct rsi_common *common,
1272 			    u8 *bssid,
1273 			    s8 rssi,
1274 			    struct ieee80211_vif *vif)
1275 {
1276 	s8 last_event = common->cqm_info.last_cqm_event_rssi;
1277 	int thold = common->cqm_info.rssi_thold;
1278 	u32 hyst = common->cqm_info.rssi_hyst;
1279 	enum nl80211_cqm_rssi_threshold_event event;
1280 
1281 	if (rssi < thold && (last_event == 0 || rssi < (last_event - hyst)))
1282 		event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
1283 	else if (rssi > thold &&
1284 		 (last_event == 0 || rssi > (last_event + hyst)))
1285 		event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
1286 	else
1287 		return;
1288 
1289 	common->cqm_info.last_cqm_event_rssi = rssi;
1290 	rsi_dbg(INFO_ZONE, "CQM: Notifying event: %d\n", event);
1291 	ieee80211_cqm_rssi_notify(vif, event, rssi, GFP_KERNEL);
1292 
1293 	return;
1294 }
1295 
1296 /**
1297  * rsi_fill_rx_status() - This function fills rx status in
1298  *			  ieee80211_rx_status structure.
1299  * @hw: Pointer to the ieee80211_hw structure.
1300  * @skb: Pointer to the socket buffer structure.
1301  * @common: Pointer to the driver private structure.
1302  * @rxs: Pointer to the ieee80211_rx_status structure.
1303  *
1304  * Return: None.
1305  */
1306 static void rsi_fill_rx_status(struct ieee80211_hw *hw,
1307 			       struct sk_buff *skb,
1308 			       struct rsi_common *common,
1309 			       struct ieee80211_rx_status *rxs)
1310 {
1311 	struct rsi_hw *adapter = common->priv;
1312 	struct ieee80211_vif *vif;
1313 	struct ieee80211_bss_conf *bss = NULL;
1314 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1315 	struct skb_info *rx_params = (struct skb_info *)info->driver_data;
1316 	struct ieee80211_hdr *hdr;
1317 	char rssi = rx_params->rssi;
1318 	u8 hdrlen = 0;
1319 	u8 channel = rx_params->channel;
1320 	s32 freq;
1321 	int i;
1322 
1323 	hdr = ((struct ieee80211_hdr *)(skb->data));
1324 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1325 
1326 	memset(info, 0, sizeof(struct ieee80211_tx_info));
1327 
1328 	rxs->signal = -(rssi);
1329 
1330 	rxs->band = common->band;
1331 
1332 	freq = ieee80211_channel_to_frequency(channel, rxs->band);
1333 
1334 	if (freq)
1335 		rxs->freq = freq;
1336 
1337 	if (ieee80211_has_protected(hdr->frame_control)) {
1338 		if (rsi_is_cipher_wep(common)) {
1339 			memmove(skb->data + 4, skb->data, hdrlen);
1340 			skb_pull(skb, 4);
1341 		} else {
1342 			memmove(skb->data + 8, skb->data, hdrlen);
1343 			skb_pull(skb, 8);
1344 			rxs->flag |= RX_FLAG_MMIC_STRIPPED;
1345 		}
1346 		rxs->flag |= RX_FLAG_DECRYPTED;
1347 		rxs->flag |= RX_FLAG_IV_STRIPPED;
1348 	}
1349 
1350 	for (i = 0; i < RSI_MAX_VIFS; i++) {
1351 		vif = adapter->vifs[i];
1352 		if (!vif)
1353 			continue;
1354 		if (vif->type == NL80211_IFTYPE_STATION) {
1355 			bss = &vif->bss_conf;
1356 			break;
1357 		}
1358 	}
1359 	if (!bss)
1360 		return;
1361 	/* CQM only for connected AP beacons, the RSSI is a weighted avg */
1362 	if (bss->assoc && !(memcmp(bss->bssid, hdr->addr2, ETH_ALEN))) {
1363 		if (ieee80211_is_beacon(hdr->frame_control))
1364 			rsi_perform_cqm(common, hdr->addr2, rxs->signal, vif);
1365 	}
1366 
1367 	return;
1368 }
1369 
1370 /**
1371  * rsi_indicate_pkt_to_os() - This function sends received packet to mac80211.
1372  * @common: Pointer to the driver private structure.
1373  * @skb: Pointer to the socket buffer structure.
1374  *
1375  * Return: None.
1376  */
1377 void rsi_indicate_pkt_to_os(struct rsi_common *common,
1378 			    struct sk_buff *skb)
1379 {
1380 	struct rsi_hw *adapter = common->priv;
1381 	struct ieee80211_hw *hw = adapter->hw;
1382 	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
1383 
1384 	if ((common->iface_down) || (!adapter->sc_nvifs)) {
1385 		dev_kfree_skb(skb);
1386 		return;
1387 	}
1388 
1389 	/* filling in the ieee80211_rx_status flags */
1390 	rsi_fill_rx_status(hw, skb, common, rx_status);
1391 
1392 	ieee80211_rx_irqsafe(hw, skb);
1393 }
1394 
1395 /**
1396  * rsi_mac80211_sta_add() - This function notifies driver about a peer getting
1397  *			    connected.
1398  * @hw: pointer to the ieee80211_hw structure.
1399  * @vif: Pointer to the ieee80211_vif structure.
1400  * @sta: Pointer to the ieee80211_sta structure.
1401  *
1402  * Return: 0 on success, negative error codes on failure.
1403  */
1404 static int rsi_mac80211_sta_add(struct ieee80211_hw *hw,
1405 				struct ieee80211_vif *vif,
1406 				struct ieee80211_sta *sta)
1407 {
1408 	struct rsi_hw *adapter = hw->priv;
1409 	struct rsi_common *common = adapter->priv;
1410 	bool sta_exist = false;
1411 	struct rsi_sta *rsta;
1412 	int status = 0;
1413 
1414 	rsi_dbg(INFO_ZONE, "Station Add: %pM\n", sta->addr);
1415 
1416 	mutex_lock(&common->mutex);
1417 
1418 	if ((vif->type == NL80211_IFTYPE_AP) ||
1419 	    (vif->type == NL80211_IFTYPE_P2P_GO)) {
1420 		u8 cnt;
1421 		int sta_idx = -1;
1422 		int free_index = -1;
1423 
1424 		/* Check if max stations reached */
1425 		if (common->num_stations >= common->max_stations) {
1426 			rsi_dbg(ERR_ZONE, "Reject: Max Stations exists\n");
1427 			status = -EOPNOTSUPP;
1428 			goto unlock;
1429 		}
1430 		for (cnt = 0; cnt < common->max_stations; cnt++) {
1431 			rsta = &common->stations[cnt];
1432 
1433 			if (!rsta->sta) {
1434 				if (free_index < 0)
1435 					free_index = cnt;
1436 				continue;
1437 			}
1438 			if (!memcmp(rsta->sta->addr, sta->addr, ETH_ALEN)) {
1439 				rsi_dbg(INFO_ZONE, "Station exists\n");
1440 				sta_idx = cnt;
1441 				sta_exist = true;
1442 				break;
1443 			}
1444 		}
1445 		if (!sta_exist) {
1446 			if (free_index >= 0)
1447 				sta_idx = free_index;
1448 		}
1449 		if (sta_idx < 0) {
1450 			rsi_dbg(ERR_ZONE,
1451 				"%s: Some problem reaching here...\n",
1452 				__func__);
1453 			status = -EINVAL;
1454 			goto unlock;
1455 		}
1456 		rsta = &common->stations[sta_idx];
1457 		rsta->sta = sta;
1458 		rsta->sta_id = sta_idx;
1459 		for (cnt = 0; cnt < IEEE80211_NUM_TIDS; cnt++)
1460 			rsta->start_tx_aggr[cnt] = false;
1461 		for (cnt = 0; cnt < IEEE80211_NUM_TIDS; cnt++)
1462 			rsta->seq_start[cnt] = 0;
1463 		if (!sta_exist) {
1464 			rsi_dbg(INFO_ZONE, "New Station\n");
1465 
1466 			/* Send peer notify to device */
1467 			rsi_dbg(INFO_ZONE, "Indicate bss status to device\n");
1468 			rsi_inform_bss_status(common, RSI_OPMODE_AP, 1,
1469 					      sta->addr, sta->wme, sta->aid,
1470 					      sta, sta_idx, 0, vif);
1471 
1472 			if (common->key) {
1473 				struct ieee80211_key_conf *key = common->key;
1474 
1475 				if ((key->cipher == WLAN_CIPHER_SUITE_WEP104) ||
1476 				    (key->cipher == WLAN_CIPHER_SUITE_WEP40))
1477 					rsi_hal_load_key(adapter->priv,
1478 							 key->key,
1479 							 key->keylen,
1480 							 RSI_PAIRWISE_KEY,
1481 							 key->keyidx,
1482 							 key->cipher,
1483 							 sta_idx,
1484 							 vif);
1485 			}
1486 
1487 			common->num_stations++;
1488 		}
1489 	}
1490 
1491 	if ((vif->type == NL80211_IFTYPE_STATION) ||
1492 	    (vif->type == NL80211_IFTYPE_P2P_CLIENT)) {
1493 		common->bitrate_mask[common->band] = sta->supp_rates[common->band];
1494 		common->vif_info[0].is_ht = sta->ht_cap.ht_supported;
1495 		if (sta->ht_cap.ht_supported) {
1496 			common->bitrate_mask[NL80211_BAND_2GHZ] =
1497 					sta->supp_rates[NL80211_BAND_2GHZ];
1498 			if ((sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20) ||
1499 			    (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40))
1500 				common->vif_info[0].sgi = true;
1501 			ieee80211_start_tx_ba_session(sta, 0, 0);
1502 		}
1503 	}
1504 
1505 unlock:
1506 	mutex_unlock(&common->mutex);
1507 
1508 	return status;
1509 }
1510 
1511 /**
1512  * rsi_mac80211_sta_remove() - This function notifies driver about a peer
1513  *			       getting disconnected.
1514  * @hw: Pointer to the ieee80211_hw structure.
1515  * @vif: Pointer to the ieee80211_vif structure.
1516  * @sta: Pointer to the ieee80211_sta structure.
1517  *
1518  * Return: 0 on success, negative error codes on failure.
1519  */
1520 static int rsi_mac80211_sta_remove(struct ieee80211_hw *hw,
1521 				   struct ieee80211_vif *vif,
1522 				   struct ieee80211_sta *sta)
1523 {
1524 	struct rsi_hw *adapter = hw->priv;
1525 	struct rsi_common *common = adapter->priv;
1526 	struct ieee80211_bss_conf *bss = &vif->bss_conf;
1527 	struct rsi_sta *rsta;
1528 
1529 	rsi_dbg(INFO_ZONE, "Station Remove: %pM\n", sta->addr);
1530 
1531 	mutex_lock(&common->mutex);
1532 
1533 	if ((vif->type == NL80211_IFTYPE_AP) ||
1534 	    (vif->type == NL80211_IFTYPE_P2P_GO)) {
1535 		u8 sta_idx, cnt;
1536 
1537 		/* Send peer notify to device */
1538 		rsi_dbg(INFO_ZONE, "Indicate bss status to device\n");
1539 		for (sta_idx = 0; sta_idx < common->max_stations; sta_idx++) {
1540 			rsta = &common->stations[sta_idx];
1541 
1542 			if (!rsta->sta)
1543 				continue;
1544 			if (!memcmp(rsta->sta->addr, sta->addr, ETH_ALEN)) {
1545 				rsi_inform_bss_status(common, RSI_OPMODE_AP, 0,
1546 						      sta->addr, sta->wme,
1547 						      sta->aid, sta, sta_idx,
1548 						      0, vif);
1549 				rsta->sta = NULL;
1550 				rsta->sta_id = -1;
1551 				for (cnt = 0; cnt < IEEE80211_NUM_TIDS; cnt++)
1552 					rsta->start_tx_aggr[cnt] = false;
1553 				if (common->num_stations > 0)
1554 					common->num_stations--;
1555 				break;
1556 			}
1557 		}
1558 		if (sta_idx >= common->max_stations)
1559 			rsi_dbg(ERR_ZONE, "%s: No station found\n", __func__);
1560 	}
1561 
1562 	if ((vif->type == NL80211_IFTYPE_STATION) ||
1563 	    (vif->type == NL80211_IFTYPE_P2P_CLIENT)) {
1564 		/* Resetting all the fields to default values */
1565 		memcpy((u8 *)bss->bssid, (u8 *)sta->addr, ETH_ALEN);
1566 		bss->qos = sta->wme;
1567 		common->bitrate_mask[NL80211_BAND_2GHZ] = 0;
1568 		common->bitrate_mask[NL80211_BAND_5GHZ] = 0;
1569 		common->vif_info[0].is_ht = false;
1570 		common->vif_info[0].sgi = false;
1571 		common->vif_info[0].seq_start = 0;
1572 		common->secinfo.ptk_cipher = 0;
1573 		common->secinfo.gtk_cipher = 0;
1574 		if (!common->iface_down)
1575 			rsi_send_rx_filter_frame(common, 0);
1576 	}
1577 	mutex_unlock(&common->mutex);
1578 
1579 	return 0;
1580 }
1581 
1582 /**
1583  * rsi_mac80211_set_antenna() - This function is used to configure
1584  *				tx and rx antennas.
1585  * @hw: Pointer to the ieee80211_hw structure.
1586  * @tx_ant: Bitmap for tx antenna
1587  * @rx_ant: Bitmap for rx antenna
1588  *
1589  * Return: 0 on success, Negative error code on failure.
1590  */
1591 static int rsi_mac80211_set_antenna(struct ieee80211_hw *hw,
1592 				    u32 tx_ant, u32 rx_ant)
1593 {
1594 	struct rsi_hw *adapter = hw->priv;
1595 	struct rsi_common *common = adapter->priv;
1596 	u8 antenna = 0;
1597 
1598 	if (tx_ant > 1 || rx_ant > 1) {
1599 		rsi_dbg(ERR_ZONE,
1600 			"Invalid antenna selection (tx: %d, rx:%d)\n",
1601 			tx_ant, rx_ant);
1602 		rsi_dbg(ERR_ZONE,
1603 			"Use 0 for int_ant, 1 for ext_ant\n");
1604 		return -EINVAL;
1605 	}
1606 
1607 	rsi_dbg(INFO_ZONE, "%s: Antenna map Tx %x Rx %d\n",
1608 			__func__, tx_ant, rx_ant);
1609 
1610 	mutex_lock(&common->mutex);
1611 
1612 	antenna = tx_ant ? ANTENNA_SEL_UFL : ANTENNA_SEL_INT;
1613 	if (common->ant_in_use != antenna)
1614 		if (rsi_set_antenna(common, antenna))
1615 			goto fail_set_antenna;
1616 
1617 	rsi_dbg(INFO_ZONE, "(%s) Antenna path configured successfully\n",
1618 		tx_ant ? "UFL" : "INT");
1619 
1620 	common->ant_in_use = antenna;
1621 
1622 	mutex_unlock(&common->mutex);
1623 
1624 	return 0;
1625 
1626 fail_set_antenna:
1627 	rsi_dbg(ERR_ZONE, "%s: Failed.\n", __func__);
1628 	mutex_unlock(&common->mutex);
1629 	return -EINVAL;
1630 }
1631 
1632 /**
1633  * rsi_mac80211_get_antenna() - This function is used to configure
1634  * 				tx and rx antennas.
1635  *
1636  * @hw: Pointer to the ieee80211_hw structure.
1637  * @tx_ant: Bitmap for tx antenna
1638  * @rx_ant: Bitmap for rx antenna
1639  *
1640  * Return: 0 on success, negative error codes on failure.
1641  */
1642 static int rsi_mac80211_get_antenna(struct ieee80211_hw *hw,
1643 				    u32 *tx_ant, u32 *rx_ant)
1644 {
1645 	struct rsi_hw *adapter = hw->priv;
1646 	struct rsi_common *common = adapter->priv;
1647 
1648 	mutex_lock(&common->mutex);
1649 
1650 	*tx_ant = (common->ant_in_use == ANTENNA_SEL_UFL) ? 1 : 0;
1651 	*rx_ant = 0;
1652 
1653 	mutex_unlock(&common->mutex);
1654 
1655 	return 0;
1656 }
1657 
1658 static int rsi_map_region_code(enum nl80211_dfs_regions region_code)
1659 {
1660 	switch (region_code) {
1661 	case NL80211_DFS_FCC:
1662 		return RSI_REGION_FCC;
1663 	case NL80211_DFS_ETSI:
1664 		return RSI_REGION_ETSI;
1665 	case NL80211_DFS_JP:
1666 		return RSI_REGION_TELEC;
1667 	case NL80211_DFS_UNSET:
1668 		return RSI_REGION_WORLD;
1669 	}
1670 	return RSI_REGION_WORLD;
1671 }
1672 
1673 static void rsi_reg_notify(struct wiphy *wiphy,
1674 			   struct regulatory_request *request)
1675 {
1676 	struct ieee80211_supported_band *sband;
1677 	struct ieee80211_channel *ch;
1678 	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
1679 	struct rsi_hw * adapter = hw->priv;
1680 	struct rsi_common *common = adapter->priv;
1681 	int i;
1682 
1683 	mutex_lock(&common->mutex);
1684 
1685 	rsi_dbg(INFO_ZONE, "country = %s dfs_region = %d\n",
1686 		request->alpha2, request->dfs_region);
1687 
1688 	if (common->num_supp_bands > 1) {
1689 		sband = wiphy->bands[NL80211_BAND_5GHZ];
1690 
1691 		for (i = 0; i < sband->n_channels; i++) {
1692 			ch = &sband->channels[i];
1693 			if (ch->flags & IEEE80211_CHAN_DISABLED)
1694 				continue;
1695 
1696 			if (ch->flags & IEEE80211_CHAN_RADAR)
1697 				ch->flags |= IEEE80211_CHAN_NO_IR;
1698 		}
1699 	}
1700 	adapter->dfs_region = rsi_map_region_code(request->dfs_region);
1701 	rsi_dbg(INFO_ZONE, "RSI region code = %d\n", adapter->dfs_region);
1702 
1703 	adapter->country[0] = request->alpha2[0];
1704 	adapter->country[1] = request->alpha2[1];
1705 
1706 	mutex_unlock(&common->mutex);
1707 }
1708 
1709 static void rsi_mac80211_rfkill_poll(struct ieee80211_hw *hw)
1710 {
1711 	struct rsi_hw *adapter = hw->priv;
1712 	struct rsi_common *common = adapter->priv;
1713 
1714 	mutex_lock(&common->mutex);
1715 	if (common->fsm_state != FSM_MAC_INIT_DONE)
1716 		wiphy_rfkill_set_hw_state(hw->wiphy, true);
1717 	else
1718 		wiphy_rfkill_set_hw_state(hw->wiphy, false);
1719 	mutex_unlock(&common->mutex);
1720 }
1721 
1722 static void rsi_resume_conn_channel(struct rsi_common *common)
1723 {
1724 	struct rsi_hw *adapter = common->priv;
1725 	struct ieee80211_vif *vif;
1726 	int cnt;
1727 
1728 	for (cnt = 0; cnt < RSI_MAX_VIFS; cnt++) {
1729 		vif = adapter->vifs[cnt];
1730 		if (!vif)
1731 			continue;
1732 
1733 		if ((vif->type == NL80211_IFTYPE_AP) ||
1734 		    (vif->type == NL80211_IFTYPE_P2P_GO)) {
1735 			rsi_switch_channel(adapter, vif);
1736 			break;
1737 		}
1738 		if (((vif->type == NL80211_IFTYPE_STATION) ||
1739 		     (vif->type == NL80211_IFTYPE_P2P_CLIENT)) &&
1740 		    vif->bss_conf.assoc) {
1741 			rsi_switch_channel(adapter, vif);
1742 			break;
1743 		}
1744 	}
1745 }
1746 
1747 void rsi_roc_timeout(struct timer_list *t)
1748 {
1749 	struct rsi_common *common = from_timer(common, t, roc_timer);
1750 
1751 	rsi_dbg(INFO_ZONE, "Remain on channel expired\n");
1752 
1753 	mutex_lock(&common->mutex);
1754 	ieee80211_remain_on_channel_expired(common->priv->hw);
1755 
1756 	if (timer_pending(&common->roc_timer))
1757 		del_timer(&common->roc_timer);
1758 
1759 	rsi_resume_conn_channel(common);
1760 	mutex_unlock(&common->mutex);
1761 }
1762 
1763 static int rsi_mac80211_roc(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1764 			    struct ieee80211_channel *chan, int duration,
1765 			    enum ieee80211_roc_type type)
1766 {
1767 	struct rsi_hw *adapter = (struct rsi_hw *)hw->priv;
1768 	struct rsi_common *common = (struct rsi_common *)adapter->priv;
1769 	int status = 0;
1770 
1771 	rsi_dbg(INFO_ZONE, "***** Remain on channel *****\n");
1772 
1773 	mutex_lock(&common->mutex);
1774 	rsi_dbg(INFO_ZONE, "%s: channel: %d duration: %dms\n",
1775 		__func__, chan->hw_value, duration);
1776 
1777 	if (timer_pending(&common->roc_timer)) {
1778 		rsi_dbg(INFO_ZONE, "Stop on-going ROC\n");
1779 		del_timer(&common->roc_timer);
1780 	}
1781 	common->roc_timer.expires = msecs_to_jiffies(duration) + jiffies;
1782 	add_timer(&common->roc_timer);
1783 
1784 	/* Configure band */
1785 	if (rsi_band_check(common, chan)) {
1786 		rsi_dbg(ERR_ZONE, "Failed to set band\n");
1787 		status = -EINVAL;
1788 		goto out;
1789 	}
1790 
1791 	/* Configure channel */
1792 	if (rsi_set_channel(common, chan)) {
1793 		rsi_dbg(ERR_ZONE, "Failed to set the channel\n");
1794 		status = -EINVAL;
1795 		goto out;
1796 	}
1797 
1798 	common->roc_vif = vif;
1799 	ieee80211_ready_on_channel(hw);
1800 	rsi_dbg(INFO_ZONE, "%s: Ready on channel :%d\n",
1801 		__func__, chan->hw_value);
1802 
1803 out:
1804 	mutex_unlock(&common->mutex);
1805 
1806 	return status;
1807 }
1808 
1809 static int rsi_mac80211_cancel_roc(struct ieee80211_hw *hw,
1810 				   struct ieee80211_vif *vif)
1811 {
1812 	struct rsi_hw *adapter = hw->priv;
1813 	struct rsi_common *common = adapter->priv;
1814 
1815 	rsi_dbg(INFO_ZONE, "Cancel remain on channel\n");
1816 
1817 	mutex_lock(&common->mutex);
1818 	if (!timer_pending(&common->roc_timer)) {
1819 		mutex_unlock(&common->mutex);
1820 		return 0;
1821 	}
1822 
1823 	del_timer(&common->roc_timer);
1824 
1825 	rsi_resume_conn_channel(common);
1826 	mutex_unlock(&common->mutex);
1827 
1828 	return 0;
1829 }
1830 
1831 #ifdef CONFIG_PM
1832 static const struct wiphy_wowlan_support rsi_wowlan_support = {
1833 	.flags = WIPHY_WOWLAN_ANY |
1834 		 WIPHY_WOWLAN_MAGIC_PKT |
1835 		 WIPHY_WOWLAN_DISCONNECT |
1836 		 WIPHY_WOWLAN_GTK_REKEY_FAILURE  |
1837 		 WIPHY_WOWLAN_SUPPORTS_GTK_REKEY |
1838 		 WIPHY_WOWLAN_EAP_IDENTITY_REQ   |
1839 		 WIPHY_WOWLAN_4WAY_HANDSHAKE,
1840 };
1841 
1842 static u16 rsi_wow_map_triggers(struct rsi_common *common,
1843 				struct cfg80211_wowlan *wowlan)
1844 {
1845 	u16 wow_triggers = 0;
1846 
1847 	rsi_dbg(INFO_ZONE, "Mapping wowlan triggers\n");
1848 
1849 	if (wowlan->any)
1850 		wow_triggers |= RSI_WOW_ANY;
1851 	if (wowlan->magic_pkt)
1852 		wow_triggers |= RSI_WOW_MAGIC_PKT;
1853 	if (wowlan->disconnect)
1854 		wow_triggers |= RSI_WOW_DISCONNECT;
1855 	if (wowlan->gtk_rekey_failure || wowlan->eap_identity_req ||
1856 	    wowlan->four_way_handshake)
1857 		wow_triggers |= RSI_WOW_GTK_REKEY;
1858 
1859 	return wow_triggers;
1860 }
1861 
1862 int rsi_config_wowlan(struct rsi_hw *adapter, struct cfg80211_wowlan *wowlan)
1863 {
1864 	struct rsi_common *common = adapter->priv;
1865 	u16 triggers = 0;
1866 	u16 rx_filter_word = 0;
1867 	struct ieee80211_bss_conf *bss = NULL;
1868 
1869 	rsi_dbg(INFO_ZONE, "Config WoWLAN to device\n");
1870 
1871 	if (!adapter->vifs[0])
1872 		return -EINVAL;
1873 
1874 	bss = &adapter->vifs[0]->bss_conf;
1875 
1876 	if (WARN_ON(!wowlan)) {
1877 		rsi_dbg(ERR_ZONE, "WoW triggers not enabled\n");
1878 		return -EINVAL;
1879 	}
1880 
1881 	common->wow_flags |= RSI_WOW_ENABLED;
1882 	triggers = rsi_wow_map_triggers(common, wowlan);
1883 	if (!triggers) {
1884 		rsi_dbg(ERR_ZONE, "%s:No valid WoW triggers\n", __func__);
1885 		return -EINVAL;
1886 	}
1887 	if (!bss->assoc) {
1888 		rsi_dbg(ERR_ZONE,
1889 			"Cannot configure WoWLAN (Station not connected)\n");
1890 		common->wow_flags |= RSI_WOW_NO_CONNECTION;
1891 		return 0;
1892 	}
1893 	rsi_dbg(INFO_ZONE, "TRIGGERS %x\n", triggers);
1894 
1895 	if (common->coex_mode > 1)
1896 		rsi_disable_ps(adapter, adapter->vifs[0]);
1897 
1898 	rsi_send_wowlan_request(common, triggers, 1);
1899 
1900 	/**
1901 	 * Increase the beacon_miss threshold & keep-alive timers in
1902 	 * vap_update frame
1903 	 */
1904 	rsi_send_vap_dynamic_update(common);
1905 
1906 	rx_filter_word = (ALLOW_DATA_ASSOC_PEER | DISALLOW_BEACONS);
1907 	rsi_send_rx_filter_frame(common, rx_filter_word);
1908 
1909 	return 0;
1910 }
1911 EXPORT_SYMBOL(rsi_config_wowlan);
1912 
1913 static int rsi_mac80211_suspend(struct ieee80211_hw *hw,
1914 				struct cfg80211_wowlan *wowlan)
1915 {
1916 	struct rsi_hw *adapter = hw->priv;
1917 	struct rsi_common *common = adapter->priv;
1918 
1919 	rsi_dbg(INFO_ZONE, "%s: mac80211 suspend\n", __func__);
1920 	mutex_lock(&common->mutex);
1921 	if (rsi_config_wowlan(adapter, wowlan)) {
1922 		rsi_dbg(ERR_ZONE, "Failed to configure WoWLAN\n");
1923 		mutex_unlock(&common->mutex);
1924 		return 1;
1925 	}
1926 	mutex_unlock(&common->mutex);
1927 
1928 	return 0;
1929 }
1930 
1931 static int rsi_mac80211_resume(struct ieee80211_hw *hw)
1932 {
1933 	u16 rx_filter_word = 0;
1934 	struct rsi_hw *adapter = hw->priv;
1935 	struct rsi_common *common = adapter->priv;
1936 
1937 	common->wow_flags = 0;
1938 
1939 	rsi_dbg(INFO_ZONE, "%s: mac80211 resume\n", __func__);
1940 
1941 	if (common->hibernate_resume) {
1942 		common->mac_ops_resumed = true;
1943 		/* Device need a complete restart of all MAC operations.
1944 		 * returning 1 will serve this purpose.
1945 		 */
1946 		return 1;
1947 	}
1948 
1949 	mutex_lock(&common->mutex);
1950 	rsi_send_wowlan_request(common, 0, 0);
1951 
1952 	rx_filter_word = (ALLOW_DATA_ASSOC_PEER | ALLOW_CTRL_ASSOC_PEER |
1953 			  ALLOW_MGMT_ASSOC_PEER);
1954 	rsi_send_rx_filter_frame(common, rx_filter_word);
1955 	mutex_unlock(&common->mutex);
1956 
1957 	return 0;
1958 }
1959 
1960 #endif
1961 
1962 static const struct ieee80211_ops mac80211_ops = {
1963 	.tx = rsi_mac80211_tx,
1964 	.start = rsi_mac80211_start,
1965 	.stop = rsi_mac80211_stop,
1966 	.add_interface = rsi_mac80211_add_interface,
1967 	.remove_interface = rsi_mac80211_remove_interface,
1968 	.config = rsi_mac80211_config,
1969 	.bss_info_changed = rsi_mac80211_bss_info_changed,
1970 	.conf_tx = rsi_mac80211_conf_tx,
1971 	.configure_filter = rsi_mac80211_conf_filter,
1972 	.set_key = rsi_mac80211_set_key,
1973 	.set_rts_threshold = rsi_mac80211_set_rts_threshold,
1974 	.set_bitrate_mask = rsi_mac80211_set_rate_mask,
1975 	.ampdu_action = rsi_mac80211_ampdu_action,
1976 	.sta_add = rsi_mac80211_sta_add,
1977 	.sta_remove = rsi_mac80211_sta_remove,
1978 	.set_antenna = rsi_mac80211_set_antenna,
1979 	.get_antenna = rsi_mac80211_get_antenna,
1980 	.rfkill_poll = rsi_mac80211_rfkill_poll,
1981 	.remain_on_channel = rsi_mac80211_roc,
1982 	.cancel_remain_on_channel = rsi_mac80211_cancel_roc,
1983 #ifdef CONFIG_PM
1984 	.suspend = rsi_mac80211_suspend,
1985 	.resume  = rsi_mac80211_resume,
1986 #endif
1987 	.hw_scan = rsi_mac80211_hw_scan_start,
1988 	.cancel_hw_scan = rsi_mac80211_cancel_hw_scan,
1989 };
1990 
1991 /**
1992  * rsi_mac80211_attach() - This function is used to initialize Mac80211 stack.
1993  * @common: Pointer to the driver private structure.
1994  *
1995  * Return: 0 on success, negative error codes on failure.
1996  */
1997 int rsi_mac80211_attach(struct rsi_common *common)
1998 {
1999 	int status = 0;
2000 	struct ieee80211_hw *hw = NULL;
2001 	struct wiphy *wiphy = NULL;
2002 	struct rsi_hw *adapter = common->priv;
2003 	u8 addr_mask[ETH_ALEN] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x3};
2004 
2005 	rsi_dbg(INIT_ZONE, "%s: Performing mac80211 attach\n", __func__);
2006 
2007 	hw = ieee80211_alloc_hw(sizeof(struct rsi_hw), &mac80211_ops);
2008 	if (!hw) {
2009 		rsi_dbg(ERR_ZONE, "%s: ieee80211 hw alloc failed\n", __func__);
2010 		return -ENOMEM;
2011 	}
2012 
2013 	wiphy = hw->wiphy;
2014 
2015 	SET_IEEE80211_DEV(hw, adapter->device);
2016 
2017 	hw->priv = adapter;
2018 	adapter->hw = hw;
2019 
2020 	ieee80211_hw_set(hw, SIGNAL_DBM);
2021 	ieee80211_hw_set(hw, HAS_RATE_CONTROL);
2022 	ieee80211_hw_set(hw, AMPDU_AGGREGATION);
2023 	ieee80211_hw_set(hw, SUPPORTS_PS);
2024 	ieee80211_hw_set(hw, SUPPORTS_DYNAMIC_PS);
2025 
2026 	hw->queues = MAX_HW_QUEUES;
2027 	hw->extra_tx_headroom = RSI_NEEDED_HEADROOM;
2028 
2029 	hw->max_rates = 1;
2030 	hw->max_rate_tries = MAX_RETRIES;
2031 	hw->uapsd_queues = RSI_IEEE80211_UAPSD_QUEUES;
2032 	hw->uapsd_max_sp_len = IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL;
2033 
2034 	hw->max_tx_aggregation_subframes = RSI_MAX_TX_AGGR_FRMS;
2035 	hw->max_rx_aggregation_subframes = RSI_MAX_RX_AGGR_FRMS;
2036 	hw->rate_control_algorithm = "AARF";
2037 
2038 	SET_IEEE80211_PERM_ADDR(hw, common->mac_addr);
2039 	ether_addr_copy(hw->wiphy->addr_mask, addr_mask);
2040 
2041 	wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
2042 				 BIT(NL80211_IFTYPE_AP) |
2043 				 BIT(NL80211_IFTYPE_P2P_DEVICE) |
2044 				 BIT(NL80211_IFTYPE_P2P_CLIENT) |
2045 				 BIT(NL80211_IFTYPE_P2P_GO);
2046 
2047 	wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
2048 	wiphy->retry_short = RETRY_SHORT;
2049 	wiphy->retry_long  = RETRY_LONG;
2050 	wiphy->frag_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
2051 	wiphy->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
2052 	wiphy->flags = 0;
2053 
2054 	wiphy->available_antennas_rx = 1;
2055 	wiphy->available_antennas_tx = 1;
2056 
2057 	status = rsi_register_rates_channels(adapter, NL80211_BAND_2GHZ);
2058 	if (status)
2059 		return status;
2060 	wiphy->bands[NL80211_BAND_2GHZ] =
2061 		&adapter->sbands[NL80211_BAND_2GHZ];
2062 	if (common->num_supp_bands > 1) {
2063 		status = rsi_register_rates_channels(adapter,
2064 						     NL80211_BAND_5GHZ);
2065 		if (status)
2066 			return status;
2067 		wiphy->bands[NL80211_BAND_5GHZ] =
2068 			&adapter->sbands[NL80211_BAND_5GHZ];
2069 	}
2070 
2071 	/* AP Parameters */
2072 	wiphy->max_ap_assoc_sta = rsi_max_ap_stas[common->oper_mode - 1];
2073 	common->max_stations = wiphy->max_ap_assoc_sta;
2074 	rsi_dbg(ERR_ZONE, "Max Stations Allowed = %d\n", common->max_stations);
2075 	hw->sta_data_size = sizeof(struct rsi_sta);
2076 
2077 	wiphy->max_scan_ssids = RSI_MAX_SCAN_SSIDS;
2078 	wiphy->max_scan_ie_len = RSI_MAX_SCAN_IE_LEN;
2079 	wiphy->flags = WIPHY_FLAG_REPORTS_OBSS;
2080 	wiphy->flags |= WIPHY_FLAG_AP_UAPSD;
2081 	wiphy->features |= NL80211_FEATURE_INACTIVITY_TIMER;
2082 	wiphy->reg_notifier = rsi_reg_notify;
2083 
2084 #ifdef CONFIG_PM
2085 	wiphy->wowlan = &rsi_wowlan_support;
2086 #endif
2087 
2088 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
2089 
2090 	/* Wi-Fi direct parameters */
2091 	wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
2092 	wiphy->flags |= WIPHY_FLAG_OFFCHAN_TX;
2093 	wiphy->max_remain_on_channel_duration = 10000;
2094 	hw->max_listen_interval = 10;
2095 	wiphy->iface_combinations = rsi_iface_combinations;
2096 	wiphy->n_iface_combinations = ARRAY_SIZE(rsi_iface_combinations);
2097 
2098 	if (common->coex_mode > 1)
2099 		wiphy->flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
2100 
2101 	status = ieee80211_register_hw(hw);
2102 	if (status)
2103 		return status;
2104 
2105 	return rsi_init_dbgfs(adapter);
2106 }
2107