1 | /* |
2 | * Copyright (c) 2013 Qualcomm Atheros, 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 "ath9k.h" |
18 | |
19 | static const struct wiphy_wowlan_support ath9k_wowlan_support_legacy = { |
20 | .flags = WIPHY_WOWLAN_MAGIC_PKT | WIPHY_WOWLAN_DISCONNECT, |
21 | .n_patterns = MAX_NUM_USER_PATTERN, |
22 | .pattern_min_len = 1, |
23 | .pattern_max_len = MAX_PATTERN_SIZE, |
24 | }; |
25 | |
26 | static const struct wiphy_wowlan_support ath9k_wowlan_support = { |
27 | .flags = WIPHY_WOWLAN_MAGIC_PKT | WIPHY_WOWLAN_DISCONNECT, |
28 | .n_patterns = MAX_NUM_PATTERN - 2, |
29 | .pattern_min_len = 1, |
30 | .pattern_max_len = MAX_PATTERN_SIZE, |
31 | }; |
32 | |
33 | static u8 ath9k_wow_map_triggers(struct ath_softc *sc, |
34 | struct cfg80211_wowlan *wowlan) |
35 | { |
36 | u8 wow_triggers = 0; |
37 | |
38 | if (wowlan->disconnect) |
39 | wow_triggers |= AH_WOW_LINK_CHANGE | |
40 | AH_WOW_BEACON_MISS; |
41 | if (wowlan->magic_pkt) |
42 | wow_triggers |= AH_WOW_MAGIC_PATTERN_EN; |
43 | |
44 | if (wowlan->n_patterns) |
45 | wow_triggers |= AH_WOW_USER_PATTERN_EN; |
46 | |
47 | return wow_triggers; |
48 | } |
49 | |
50 | static int ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc) |
51 | { |
52 | struct ath_hw *ah = sc->sc_ah; |
53 | struct ath_common *common = ath9k_hw_common(ah); |
54 | int pattern_count = 0; |
55 | int ret, i, byte_cnt = 0; |
56 | u8 dis_deauth_pattern[MAX_PATTERN_SIZE]; |
57 | u8 dis_deauth_mask[MAX_PATTERN_SIZE]; |
58 | |
59 | memset(dis_deauth_pattern, 0, MAX_PATTERN_SIZE); |
60 | memset(dis_deauth_mask, 0, MAX_PATTERN_SIZE); |
61 | |
62 | /* |
63 | * Create Dissassociate / Deauthenticate packet filter |
64 | * |
65 | * 2 bytes 2 byte 6 bytes 6 bytes 6 bytes |
66 | * +--------------+----------+---------+--------+--------+---- |
67 | * + Frame Control+ Duration + DA + SA + BSSID + |
68 | * +--------------+----------+---------+--------+--------+---- |
69 | * |
70 | * The above is the management frame format for disassociate/ |
71 | * deauthenticate pattern, from this we need to match the first byte |
72 | * of 'Frame Control' and DA, SA, and BSSID fields |
73 | * (skipping 2nd byte of FC and Duration feild. |
74 | * |
75 | * Disassociate pattern |
76 | * -------------------- |
77 | * Frame control = 00 00 1010 |
78 | * DA, SA, BSSID = x:x:x:x:x:x |
79 | * Pattern will be A0000000 | x:x:x:x:x:x | x:x:x:x:x:x |
80 | * | x:x:x:x:x:x -- 22 bytes |
81 | * |
82 | * Deauthenticate pattern |
83 | * ---------------------- |
84 | * Frame control = 00 00 1100 |
85 | * DA, SA, BSSID = x:x:x:x:x:x |
86 | * Pattern will be C0000000 | x:x:x:x:x:x | x:x:x:x:x:x |
87 | * | x:x:x:x:x:x -- 22 bytes |
88 | */ |
89 | |
90 | /* Fill out the mask with all FF's */ |
91 | for (i = 0; i < MAX_PATTERN_MASK_SIZE; i++) |
92 | dis_deauth_mask[i] = 0xff; |
93 | |
94 | /* copy the first byte of frame control field */ |
95 | dis_deauth_pattern[byte_cnt] = 0xa0; |
96 | byte_cnt++; |
97 | |
98 | /* skip 2nd byte of frame control and Duration field */ |
99 | byte_cnt += 3; |
100 | |
101 | /* |
102 | * need not match the destination mac address, it can be a broadcast |
103 | * mac address or an unicast to this station |
104 | */ |
105 | byte_cnt += 6; |
106 | |
107 | /* copy the source mac address */ |
108 | memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN); |
109 | |
110 | byte_cnt += 6; |
111 | |
112 | /* copy the bssid, its same as the source mac address */ |
113 | memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN); |
114 | |
115 | /* Create Disassociate pattern mask */ |
116 | dis_deauth_mask[0] = 0xfe; |
117 | dis_deauth_mask[1] = 0x03; |
118 | dis_deauth_mask[2] = 0xc0; |
119 | |
120 | ret = ath9k_hw_wow_apply_pattern(ah, user_pattern: dis_deauth_pattern, user_mask: dis_deauth_mask, |
121 | pattern_count, pattern_len: byte_cnt); |
122 | if (ret) |
123 | goto exit; |
124 | |
125 | pattern_count++; |
126 | /* |
127 | * for de-authenticate pattern, only the first byte of the frame |
128 | * control field gets changed from 0xA0 to 0xC0 |
129 | */ |
130 | dis_deauth_pattern[0] = 0xC0; |
131 | |
132 | ret = ath9k_hw_wow_apply_pattern(ah, user_pattern: dis_deauth_pattern, user_mask: dis_deauth_mask, |
133 | pattern_count, pattern_len: byte_cnt); |
134 | exit: |
135 | return ret; |
136 | } |
137 | |
138 | static int ath9k_wow_add_pattern(struct ath_softc *sc, |
139 | struct cfg80211_wowlan *wowlan) |
140 | { |
141 | struct ath_hw *ah = sc->sc_ah; |
142 | struct cfg80211_pkt_pattern *patterns = wowlan->patterns; |
143 | u8 wow_pattern[MAX_PATTERN_SIZE]; |
144 | u8 wow_mask[MAX_PATTERN_SIZE]; |
145 | int mask_len, ret = 0; |
146 | s8 i = 0; |
147 | |
148 | for (i = 0; i < wowlan->n_patterns; i++) { |
149 | mask_len = DIV_ROUND_UP(patterns[i].pattern_len, 8); |
150 | memset(wow_pattern, 0, MAX_PATTERN_SIZE); |
151 | memset(wow_mask, 0, MAX_PATTERN_SIZE); |
152 | memcpy(wow_pattern, patterns[i].pattern, patterns[i].pattern_len); |
153 | memcpy(wow_mask, patterns[i].mask, mask_len); |
154 | |
155 | ret = ath9k_hw_wow_apply_pattern(ah, |
156 | user_pattern: wow_pattern, |
157 | user_mask: wow_mask, |
158 | pattern_count: i + 2, |
159 | pattern_len: patterns[i].pattern_len); |
160 | if (ret) |
161 | break; |
162 | } |
163 | |
164 | return ret; |
165 | } |
166 | |
167 | int ath9k_suspend(struct ieee80211_hw *hw, |
168 | struct cfg80211_wowlan *wowlan) |
169 | { |
170 | struct ath_softc *sc = hw->priv; |
171 | struct ath_hw *ah = sc->sc_ah; |
172 | struct ath_common *common = ath9k_hw_common(ah); |
173 | u8 triggers; |
174 | int ret = 0; |
175 | |
176 | ath9k_deinit_channel_context(sc); |
177 | |
178 | mutex_lock(&sc->mutex); |
179 | |
180 | if (test_bit(ATH_OP_INVALID, &common->op_flags)) { |
181 | ath_err(common, "Device not present\n" ); |
182 | ret = -ENODEV; |
183 | goto fail_wow; |
184 | } |
185 | |
186 | if (WARN_ON(!wowlan)) { |
187 | ath_err(common, "None of the WoW triggers enabled\n" ); |
188 | ret = -EINVAL; |
189 | goto fail_wow; |
190 | } |
191 | |
192 | if (sc->cur_chan->nvifs > 1) { |
193 | ath_dbg(common, WOW, "WoW for multivif is not yet supported\n" ); |
194 | ret = 1; |
195 | goto fail_wow; |
196 | } |
197 | |
198 | if (ath9k_is_chanctx_enabled()) { |
199 | if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) { |
200 | ath_dbg(common, WOW, |
201 | "Multi-channel WOW is not supported\n" ); |
202 | ret = 1; |
203 | goto fail_wow; |
204 | } |
205 | } |
206 | |
207 | if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) { |
208 | ath_dbg(common, WOW, "None of the STA vifs are associated\n" ); |
209 | ret = 1; |
210 | goto fail_wow; |
211 | } |
212 | |
213 | triggers = ath9k_wow_map_triggers(sc, wowlan); |
214 | if (!triggers) { |
215 | ath_dbg(common, WOW, "No valid WoW triggers\n" ); |
216 | ret = 1; |
217 | goto fail_wow; |
218 | } |
219 | |
220 | ath_cancel_work(sc); |
221 | ath_stop_ani(sc); |
222 | |
223 | ath9k_ps_wakeup(sc); |
224 | |
225 | ath9k_stop_btcoex(sc); |
226 | |
227 | /* |
228 | * Enable wake up on recieving disassoc/deauth |
229 | * frame by default. |
230 | */ |
231 | ret = ath9k_wow_add_disassoc_deauth_pattern(sc); |
232 | if (ret) { |
233 | ath_err(common, |
234 | "Unable to add disassoc/deauth pattern: %d\n" , ret); |
235 | goto fail_wow; |
236 | } |
237 | |
238 | if (triggers & AH_WOW_USER_PATTERN_EN) { |
239 | ret = ath9k_wow_add_pattern(sc, wowlan); |
240 | if (ret) { |
241 | ath_err(common, |
242 | "Unable to add user pattern: %d\n" , ret); |
243 | goto fail_wow; |
244 | } |
245 | } |
246 | |
247 | spin_lock_bh(lock: &sc->sc_pcu_lock); |
248 | /* |
249 | * To avoid false wake, we enable beacon miss interrupt only |
250 | * when we go to sleep. We save the current interrupt mask |
251 | * so we can restore it after the system wakes up |
252 | */ |
253 | sc->wow_intr_before_sleep = ah->imask; |
254 | ah->imask &= ~ATH9K_INT_GLOBAL; |
255 | ath9k_hw_disable_interrupts(ah); |
256 | ah->imask = ATH9K_INT_BMISS | ATH9K_INT_GLOBAL; |
257 | ath9k_hw_set_interrupts(ah); |
258 | ath9k_hw_enable_interrupts(ah); |
259 | |
260 | spin_unlock_bh(lock: &sc->sc_pcu_lock); |
261 | |
262 | /* |
263 | * we can now sync irq and kill any running tasklets, since we already |
264 | * disabled interrupts and not holding a spin lock |
265 | */ |
266 | synchronize_irq(irq: sc->irq); |
267 | tasklet_kill(t: &sc->intr_tq); |
268 | |
269 | ath9k_hw_wow_enable(ah, pattern_enable: triggers); |
270 | |
271 | ath9k_ps_restore(sc); |
272 | ath_dbg(common, WOW, "Suspend with WoW triggers: 0x%x\n" , triggers); |
273 | |
274 | set_bit(nr: ATH_OP_WOW_ENABLED, addr: &common->op_flags); |
275 | fail_wow: |
276 | mutex_unlock(lock: &sc->mutex); |
277 | return ret; |
278 | } |
279 | |
280 | int ath9k_resume(struct ieee80211_hw *hw) |
281 | { |
282 | struct ath_softc *sc = hw->priv; |
283 | struct ath_hw *ah = sc->sc_ah; |
284 | struct ath_common *common = ath9k_hw_common(ah); |
285 | u8 status; |
286 | |
287 | mutex_lock(&sc->mutex); |
288 | |
289 | ath9k_ps_wakeup(sc); |
290 | |
291 | spin_lock_bh(lock: &sc->sc_pcu_lock); |
292 | |
293 | ath9k_hw_disable_interrupts(ah); |
294 | ah->imask = sc->wow_intr_before_sleep; |
295 | ath9k_hw_set_interrupts(ah); |
296 | ath9k_hw_enable_interrupts(ah); |
297 | |
298 | spin_unlock_bh(lock: &sc->sc_pcu_lock); |
299 | |
300 | status = ath9k_hw_wow_wakeup(ah); |
301 | ath_dbg(common, WOW, "Resume with WoW status: 0x%x\n" , status); |
302 | |
303 | ath_restart_work(sc); |
304 | ath9k_start_btcoex(sc); |
305 | |
306 | clear_bit(nr: ATH_OP_WOW_ENABLED, addr: &common->op_flags); |
307 | |
308 | ath9k_ps_restore(sc); |
309 | mutex_unlock(lock: &sc->mutex); |
310 | |
311 | return 0; |
312 | } |
313 | |
314 | void ath9k_set_wakeup(struct ieee80211_hw *hw, bool enabled) |
315 | { |
316 | struct ath_softc *sc = hw->priv; |
317 | struct ath_common *common = ath9k_hw_common(ah: sc->sc_ah); |
318 | |
319 | mutex_lock(&sc->mutex); |
320 | device_set_wakeup_enable(dev: sc->dev, enable: enabled); |
321 | mutex_unlock(lock: &sc->mutex); |
322 | |
323 | ath_dbg(common, WOW, "WoW wakeup source is %s\n" , |
324 | (enabled) ? "enabled" : "disabled" ); |
325 | } |
326 | |
327 | void ath9k_init_wow(struct ieee80211_hw *hw) |
328 | { |
329 | struct ath_softc *sc = hw->priv; |
330 | struct ath_hw *ah = sc->sc_ah; |
331 | |
332 | if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow) { |
333 | if (AR_SREV_9462_20_OR_LATER(ah) || AR_SREV_9565_11_OR_LATER(ah)) |
334 | hw->wiphy->wowlan = &ath9k_wowlan_support; |
335 | else |
336 | hw->wiphy->wowlan = &ath9k_wowlan_support_legacy; |
337 | |
338 | device_init_wakeup(dev: sc->dev, enable: 1); |
339 | } |
340 | } |
341 | |
342 | void ath9k_deinit_wow(struct ieee80211_hw *hw) |
343 | { |
344 | struct ath_softc *sc = hw->priv; |
345 | |
346 | if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow) |
347 | device_init_wakeup(dev: sc->dev, enable: 0); |
348 | } |
349 | |