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
19static 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
26static 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
33static 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
50static 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);
134exit:
135 return ret;
136}
137
138static 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
167int 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);
275fail_wow:
276 mutex_unlock(lock: &sc->mutex);
277 return ret;
278}
279
280int 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
314void 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
327void 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
342void 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

source code of linux/drivers/net/wireless/ath/ath9k/wow.c