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1/*
2 * Copyright (c) 2010-2011 Atheros Communications 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 "htc.h"
18
19static const char *wmi_cmd_to_name(enum wmi_cmd_id wmi_cmd)
20{
21 switch (wmi_cmd) {
22 case WMI_ECHO_CMDID:
23 return "WMI_ECHO_CMDID";
24 case WMI_ACCESS_MEMORY_CMDID:
25 return "WMI_ACCESS_MEMORY_CMDID";
26 case WMI_GET_FW_VERSION:
27 return "WMI_GET_FW_VERSION";
28 case WMI_DISABLE_INTR_CMDID:
29 return "WMI_DISABLE_INTR_CMDID";
30 case WMI_ENABLE_INTR_CMDID:
31 return "WMI_ENABLE_INTR_CMDID";
32 case WMI_ATH_INIT_CMDID:
33 return "WMI_ATH_INIT_CMDID";
34 case WMI_ABORT_TXQ_CMDID:
35 return "WMI_ABORT_TXQ_CMDID";
36 case WMI_STOP_TX_DMA_CMDID:
37 return "WMI_STOP_TX_DMA_CMDID";
38 case WMI_ABORT_TX_DMA_CMDID:
39 return "WMI_ABORT_TX_DMA_CMDID";
40 case WMI_DRAIN_TXQ_CMDID:
41 return "WMI_DRAIN_TXQ_CMDID";
42 case WMI_DRAIN_TXQ_ALL_CMDID:
43 return "WMI_DRAIN_TXQ_ALL_CMDID";
44 case WMI_START_RECV_CMDID:
45 return "WMI_START_RECV_CMDID";
46 case WMI_STOP_RECV_CMDID:
47 return "WMI_STOP_RECV_CMDID";
48 case WMI_FLUSH_RECV_CMDID:
49 return "WMI_FLUSH_RECV_CMDID";
50 case WMI_SET_MODE_CMDID:
51 return "WMI_SET_MODE_CMDID";
52 case WMI_NODE_CREATE_CMDID:
53 return "WMI_NODE_CREATE_CMDID";
54 case WMI_NODE_REMOVE_CMDID:
55 return "WMI_NODE_REMOVE_CMDID";
56 case WMI_VAP_REMOVE_CMDID:
57 return "WMI_VAP_REMOVE_CMDID";
58 case WMI_VAP_CREATE_CMDID:
59 return "WMI_VAP_CREATE_CMDID";
60 case WMI_REG_READ_CMDID:
61 return "WMI_REG_READ_CMDID";
62 case WMI_REG_WRITE_CMDID:
63 return "WMI_REG_WRITE_CMDID";
64 case WMI_RC_STATE_CHANGE_CMDID:
65 return "WMI_RC_STATE_CHANGE_CMDID";
66 case WMI_RC_RATE_UPDATE_CMDID:
67 return "WMI_RC_RATE_UPDATE_CMDID";
68 case WMI_TARGET_IC_UPDATE_CMDID:
69 return "WMI_TARGET_IC_UPDATE_CMDID";
70 case WMI_TX_AGGR_ENABLE_CMDID:
71 return "WMI_TX_AGGR_ENABLE_CMDID";
72 case WMI_TGT_DETACH_CMDID:
73 return "WMI_TGT_DETACH_CMDID";
74 case WMI_NODE_UPDATE_CMDID:
75 return "WMI_NODE_UPDATE_CMDID";
76 case WMI_INT_STATS_CMDID:
77 return "WMI_INT_STATS_CMDID";
78 case WMI_TX_STATS_CMDID:
79 return "WMI_TX_STATS_CMDID";
80 case WMI_RX_STATS_CMDID:
81 return "WMI_RX_STATS_CMDID";
82 case WMI_BITRATE_MASK_CMDID:
83 return "WMI_BITRATE_MASK_CMDID";
84 }
85
86 return "Bogus";
87}
88
89struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
90{
91 struct wmi *wmi;
92
93 wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
94 if (!wmi)
95 return NULL;
96
97 wmi->drv_priv = priv;
98 wmi->stopped = false;
99 skb_queue_head_init(&wmi->wmi_event_queue);
100 spin_lock_init(&wmi->wmi_lock);
101 spin_lock_init(&wmi->event_lock);
102 mutex_init(&wmi->op_mutex);
103 mutex_init(&wmi->multi_write_mutex);
104 init_completion(&wmi->cmd_wait);
105 INIT_LIST_HEAD(&wmi->pending_tx_events);
106 tasklet_init(&wmi->wmi_event_tasklet, ath9k_wmi_event_tasklet,
107 (unsigned long)wmi);
108
109 return wmi;
110}
111
112void ath9k_deinit_wmi(struct ath9k_htc_priv *priv)
113{
114 struct wmi *wmi = priv->wmi;
115
116 mutex_lock(&wmi->op_mutex);
117 wmi->stopped = true;
118 mutex_unlock(&wmi->op_mutex);
119
120 kfree(priv->wmi);
121}
122
123void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv)
124{
125 unsigned long flags;
126
127 tasklet_kill(&priv->wmi->wmi_event_tasklet);
128 spin_lock_irqsave(&priv->wmi->wmi_lock, flags);
129 __skb_queue_purge(&priv->wmi->wmi_event_queue);
130 spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags);
131}
132
133void ath9k_wmi_event_tasklet(unsigned long data)
134{
135 struct wmi *wmi = (struct wmi *)data;
136 struct ath9k_htc_priv *priv = wmi->drv_priv;
137 struct wmi_cmd_hdr *hdr;
138 void *wmi_event;
139 struct wmi_event_swba *swba;
140 struct sk_buff *skb = NULL;
141 unsigned long flags;
142 u16 cmd_id;
143
144 do {
145 spin_lock_irqsave(&wmi->wmi_lock, flags);
146 skb = __skb_dequeue(&wmi->wmi_event_queue);
147 if (!skb) {
148 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
149 return;
150 }
151 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
152
153 hdr = (struct wmi_cmd_hdr *) skb->data;
154 cmd_id = be16_to_cpu(hdr->command_id);
155 wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
156
157 switch (cmd_id) {
158 case WMI_SWBA_EVENTID:
159 swba = (struct wmi_event_swba *) wmi_event;
160 ath9k_htc_swba(priv, swba);
161 break;
162 case WMI_FATAL_EVENTID:
163 ieee80211_queue_work(wmi->drv_priv->hw,
164 &wmi->drv_priv->fatal_work);
165 break;
166 case WMI_TXSTATUS_EVENTID:
167 spin_lock_bh(&priv->tx.tx_lock);
168 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
169 spin_unlock_bh(&priv->tx.tx_lock);
170 break;
171 }
172 spin_unlock_bh(&priv->tx.tx_lock);
173
174 ath9k_htc_txstatus(priv, wmi_event);
175 break;
176 default:
177 break;
178 }
179
180 kfree_skb(skb);
181 } while (1);
182}
183
184void ath9k_fatal_work(struct work_struct *work)
185{
186 struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
187 fatal_work);
188 struct ath_common *common = ath9k_hw_common(priv->ah);
189
190 ath_dbg(common, ATH_DBG_FATAL, "FATAL Event received, resetting device\n");
191 ath9k_htc_reset(priv);
192}
193
194static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
195{
196 skb_pull(skb, sizeof(struct wmi_cmd_hdr));
197
198 if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
199 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
200
201 complete(&wmi->cmd_wait);
202}
203
204static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
205 enum htc_endpoint_id epid)
206{
207 struct wmi *wmi = (struct wmi *) priv;
208 struct wmi_cmd_hdr *hdr;
209 u16 cmd_id;
210
211 if (unlikely(wmi->stopped))
212 goto free_skb;
213
214 hdr = (struct wmi_cmd_hdr *) skb->data;
215 cmd_id = be16_to_cpu(hdr->command_id);
216
217 if (cmd_id & 0x1000) {
218 spin_lock(&wmi->wmi_lock);
219 __skb_queue_tail(&wmi->wmi_event_queue, skb);
220 spin_unlock(&wmi->wmi_lock);
221 tasklet_schedule(&wmi->wmi_event_tasklet);
222 return;
223 }
224
225 /* Check if there has been a timeout. */
226 spin_lock(&wmi->wmi_lock);
227 if (cmd_id != wmi->last_cmd_id) {
228 spin_unlock(&wmi->wmi_lock);
229 goto free_skb;
230 }
231 spin_unlock(&wmi->wmi_lock);
232
233 /* WMI command response */
234 ath9k_wmi_rsp_callback(wmi, skb);
235
236free_skb:
237 kfree_skb(skb);
238}
239
240static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
241 enum htc_endpoint_id epid, bool txok)
242{
243 kfree_skb(skb);
244}
245
246int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
247 enum htc_endpoint_id *wmi_ctrl_epid)
248{
249 struct htc_service_connreq connect;
250 int ret;
251
252 wmi->htc = htc;
253
254 memset(&connect, 0, sizeof(connect));
255
256 connect.ep_callbacks.priv = wmi;
257 connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
258 connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
259 connect.service_id = WMI_CONTROL_SVC;
260
261 ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
262 if (ret)
263 return ret;
264
265 *wmi_ctrl_epid = wmi->ctrl_epid;
266
267 return 0;
268}
269
270static int ath9k_wmi_cmd_issue(struct wmi *wmi,
271 struct sk_buff *skb,
272 enum wmi_cmd_id cmd, u16 len)
273{
274 struct wmi_cmd_hdr *hdr;
275
276 hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr));
277 hdr->command_id = cpu_to_be16(cmd);
278 hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
279
280 return htc_send_epid(wmi->htc, skb, wmi->ctrl_epid);
281}
282
283int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
284 u8 *cmd_buf, u32 cmd_len,
285 u8 *rsp_buf, u32 rsp_len,
286 u32 timeout)
287{
288 struct ath_hw *ah = wmi->drv_priv->ah;
289 struct ath_common *common = ath9k_hw_common(ah);
290 u16 headroom = sizeof(struct htc_frame_hdr) +
291 sizeof(struct wmi_cmd_hdr);
292 struct sk_buff *skb;
293 u8 *data;
294 int time_left, ret = 0;
295 unsigned long flags;
296
297 if (ah->ah_flags & AH_UNPLUGGED)
298 return 0;
299
300 skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
301 if (!skb)
302 return -ENOMEM;
303
304 skb_reserve(skb, headroom);
305
306 if (cmd_len != 0 && cmd_buf != NULL) {
307 data = (u8 *) skb_put(skb, cmd_len);
308 memcpy(data, cmd_buf, cmd_len);
309 }
310
311 mutex_lock(&wmi->op_mutex);
312
313 /* check if wmi stopped flag is set */
314 if (unlikely(wmi->stopped)) {
315 ret = -EPROTO;
316 goto out;
317 }
318
319 /* record the rsp buffer and length */
320 wmi->cmd_rsp_buf = rsp_buf;
321 wmi->cmd_rsp_len = rsp_len;
322
323 spin_lock_irqsave(&wmi->wmi_lock, flags);
324 wmi->last_cmd_id = cmd_id;
325 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
326
327 ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
328 if (ret)
329 goto out;
330
331 time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
332 if (!time_left) {
333 ath_dbg(common, ATH_DBG_WMI,
334 "Timeout waiting for WMI command: %s\n",
335 wmi_cmd_to_name(cmd_id));
336 mutex_unlock(&wmi->op_mutex);
337 return -ETIMEDOUT;
338 }
339
340 mutex_unlock(&wmi->op_mutex);
341
342 return 0;
343
344out:
345 ath_dbg(common, ATH_DBG_WMI,
346 "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
347 mutex_unlock(&wmi->op_mutex);
348 kfree_skb(skb);
349
350 return ret;
351}
1/*
2 * Copyright (c) 2010-2011 Atheros Communications 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 "htc.h"
18
19static const char *wmi_cmd_to_name(enum wmi_cmd_id wmi_cmd)
20{
21 switch (wmi_cmd) {
22 case WMI_ECHO_CMDID:
23 return "WMI_ECHO_CMDID";
24 case WMI_ACCESS_MEMORY_CMDID:
25 return "WMI_ACCESS_MEMORY_CMDID";
26 case WMI_GET_FW_VERSION:
27 return "WMI_GET_FW_VERSION";
28 case WMI_DISABLE_INTR_CMDID:
29 return "WMI_DISABLE_INTR_CMDID";
30 case WMI_ENABLE_INTR_CMDID:
31 return "WMI_ENABLE_INTR_CMDID";
32 case WMI_ATH_INIT_CMDID:
33 return "WMI_ATH_INIT_CMDID";
34 case WMI_ABORT_TXQ_CMDID:
35 return "WMI_ABORT_TXQ_CMDID";
36 case WMI_STOP_TX_DMA_CMDID:
37 return "WMI_STOP_TX_DMA_CMDID";
38 case WMI_ABORT_TX_DMA_CMDID:
39 return "WMI_ABORT_TX_DMA_CMDID";
40 case WMI_DRAIN_TXQ_CMDID:
41 return "WMI_DRAIN_TXQ_CMDID";
42 case WMI_DRAIN_TXQ_ALL_CMDID:
43 return "WMI_DRAIN_TXQ_ALL_CMDID";
44 case WMI_START_RECV_CMDID:
45 return "WMI_START_RECV_CMDID";
46 case WMI_STOP_RECV_CMDID:
47 return "WMI_STOP_RECV_CMDID";
48 case WMI_FLUSH_RECV_CMDID:
49 return "WMI_FLUSH_RECV_CMDID";
50 case WMI_SET_MODE_CMDID:
51 return "WMI_SET_MODE_CMDID";
52 case WMI_NODE_CREATE_CMDID:
53 return "WMI_NODE_CREATE_CMDID";
54 case WMI_NODE_REMOVE_CMDID:
55 return "WMI_NODE_REMOVE_CMDID";
56 case WMI_VAP_REMOVE_CMDID:
57 return "WMI_VAP_REMOVE_CMDID";
58 case WMI_VAP_CREATE_CMDID:
59 return "WMI_VAP_CREATE_CMDID";
60 case WMI_REG_READ_CMDID:
61 return "WMI_REG_READ_CMDID";
62 case WMI_REG_WRITE_CMDID:
63 return "WMI_REG_WRITE_CMDID";
64 case WMI_REG_RMW_CMDID:
65 return "WMI_REG_RMW_CMDID";
66 case WMI_RC_STATE_CHANGE_CMDID:
67 return "WMI_RC_STATE_CHANGE_CMDID";
68 case WMI_RC_RATE_UPDATE_CMDID:
69 return "WMI_RC_RATE_UPDATE_CMDID";
70 case WMI_TARGET_IC_UPDATE_CMDID:
71 return "WMI_TARGET_IC_UPDATE_CMDID";
72 case WMI_TX_AGGR_ENABLE_CMDID:
73 return "WMI_TX_AGGR_ENABLE_CMDID";
74 case WMI_TGT_DETACH_CMDID:
75 return "WMI_TGT_DETACH_CMDID";
76 case WMI_NODE_UPDATE_CMDID:
77 return "WMI_NODE_UPDATE_CMDID";
78 case WMI_INT_STATS_CMDID:
79 return "WMI_INT_STATS_CMDID";
80 case WMI_TX_STATS_CMDID:
81 return "WMI_TX_STATS_CMDID";
82 case WMI_RX_STATS_CMDID:
83 return "WMI_RX_STATS_CMDID";
84 case WMI_BITRATE_MASK_CMDID:
85 return "WMI_BITRATE_MASK_CMDID";
86 }
87
88 return "Bogus";
89}
90
91struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
92{
93 struct wmi *wmi;
94
95 wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
96 if (!wmi)
97 return NULL;
98
99 wmi->drv_priv = priv;
100 wmi->stopped = false;
101 skb_queue_head_init(&wmi->wmi_event_queue);
102 spin_lock_init(&wmi->wmi_lock);
103 spin_lock_init(&wmi->event_lock);
104 mutex_init(&wmi->op_mutex);
105 mutex_init(&wmi->multi_write_mutex);
106 mutex_init(&wmi->multi_rmw_mutex);
107 init_completion(&wmi->cmd_wait);
108 INIT_LIST_HEAD(&wmi->pending_tx_events);
109 tasklet_init(&wmi->wmi_event_tasklet, ath9k_wmi_event_tasklet,
110 (unsigned long)wmi);
111
112 return wmi;
113}
114
115void ath9k_stop_wmi(struct ath9k_htc_priv *priv)
116{
117 struct wmi *wmi = priv->wmi;
118
119 mutex_lock(&wmi->op_mutex);
120 wmi->stopped = true;
121 mutex_unlock(&wmi->op_mutex);
122}
123
124void ath9k_destoy_wmi(struct ath9k_htc_priv *priv)
125{
126 kfree(priv->wmi);
127}
128
129void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv)
130{
131 unsigned long flags;
132
133 tasklet_kill(&priv->wmi->wmi_event_tasklet);
134 spin_lock_irqsave(&priv->wmi->wmi_lock, flags);
135 __skb_queue_purge(&priv->wmi->wmi_event_queue);
136 spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags);
137}
138
139void ath9k_wmi_event_tasklet(unsigned long data)
140{
141 struct wmi *wmi = (struct wmi *)data;
142 struct ath9k_htc_priv *priv = wmi->drv_priv;
143 struct wmi_cmd_hdr *hdr;
144 void *wmi_event;
145 struct wmi_event_swba *swba;
146 struct sk_buff *skb = NULL;
147 unsigned long flags;
148 u16 cmd_id;
149
150 do {
151 spin_lock_irqsave(&wmi->wmi_lock, flags);
152 skb = __skb_dequeue(&wmi->wmi_event_queue);
153 if (!skb) {
154 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
155 return;
156 }
157 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
158
159 hdr = (struct wmi_cmd_hdr *) skb->data;
160 cmd_id = be16_to_cpu(hdr->command_id);
161 wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
162
163 switch (cmd_id) {
164 case WMI_SWBA_EVENTID:
165 swba = wmi_event;
166 ath9k_htc_swba(priv, swba);
167 break;
168 case WMI_FATAL_EVENTID:
169 ieee80211_queue_work(wmi->drv_priv->hw,
170 &wmi->drv_priv->fatal_work);
171 break;
172 case WMI_TXSTATUS_EVENTID:
173 spin_lock_bh(&priv->tx.tx_lock);
174 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
175 spin_unlock_bh(&priv->tx.tx_lock);
176 break;
177 }
178 spin_unlock_bh(&priv->tx.tx_lock);
179
180 ath9k_htc_txstatus(priv, wmi_event);
181 break;
182 default:
183 break;
184 }
185
186 kfree_skb(skb);
187 } while (1);
188}
189
190void ath9k_fatal_work(struct work_struct *work)
191{
192 struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
193 fatal_work);
194 struct ath_common *common = ath9k_hw_common(priv->ah);
195
196 ath_dbg(common, FATAL, "FATAL Event received, resetting device\n");
197 ath9k_htc_reset(priv);
198}
199
200static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
201{
202 skb_pull(skb, sizeof(struct wmi_cmd_hdr));
203
204 if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
205 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
206
207 complete(&wmi->cmd_wait);
208}
209
210static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
211 enum htc_endpoint_id epid)
212{
213 struct wmi *wmi = priv;
214 struct wmi_cmd_hdr *hdr;
215 unsigned long flags;
216 u16 cmd_id;
217
218 if (unlikely(wmi->stopped))
219 goto free_skb;
220
221 hdr = (struct wmi_cmd_hdr *) skb->data;
222 cmd_id = be16_to_cpu(hdr->command_id);
223
224 if (cmd_id & 0x1000) {
225 spin_lock_irqsave(&wmi->wmi_lock, flags);
226 __skb_queue_tail(&wmi->wmi_event_queue, skb);
227 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
228 tasklet_schedule(&wmi->wmi_event_tasklet);
229 return;
230 }
231
232 /* Check if there has been a timeout. */
233 spin_lock_irqsave(&wmi->wmi_lock, flags);
234 if (be16_to_cpu(hdr->seq_no) != wmi->last_seq_id) {
235 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
236 goto free_skb;
237 }
238 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
239
240 /* WMI command response */
241 ath9k_wmi_rsp_callback(wmi, skb);
242
243free_skb:
244 kfree_skb(skb);
245}
246
247static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
248 enum htc_endpoint_id epid, bool txok)
249{
250 kfree_skb(skb);
251}
252
253int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
254 enum htc_endpoint_id *wmi_ctrl_epid)
255{
256 struct htc_service_connreq connect;
257 int ret;
258
259 wmi->htc = htc;
260
261 memset(&connect, 0, sizeof(connect));
262
263 connect.ep_callbacks.priv = wmi;
264 connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
265 connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
266 connect.service_id = WMI_CONTROL_SVC;
267
268 ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
269 if (ret)
270 return ret;
271
272 *wmi_ctrl_epid = wmi->ctrl_epid;
273
274 return 0;
275}
276
277static int ath9k_wmi_cmd_issue(struct wmi *wmi,
278 struct sk_buff *skb,
279 enum wmi_cmd_id cmd, u16 len)
280{
281 struct wmi_cmd_hdr *hdr;
282 unsigned long flags;
283
284 hdr = skb_push(skb, sizeof(struct wmi_cmd_hdr));
285 hdr->command_id = cpu_to_be16(cmd);
286 hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
287
288 spin_lock_irqsave(&wmi->wmi_lock, flags);
289 wmi->last_seq_id = wmi->tx_seq_id;
290 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
291
292 return htc_send_epid(wmi->htc, skb, wmi->ctrl_epid);
293}
294
295int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
296 u8 *cmd_buf, u32 cmd_len,
297 u8 *rsp_buf, u32 rsp_len,
298 u32 timeout)
299{
300 struct ath_hw *ah = wmi->drv_priv->ah;
301 struct ath_common *common = ath9k_hw_common(ah);
302 u16 headroom = sizeof(struct htc_frame_hdr) +
303 sizeof(struct wmi_cmd_hdr);
304 struct sk_buff *skb;
305 unsigned long time_left;
306 int ret = 0;
307
308 if (ah->ah_flags & AH_UNPLUGGED)
309 return 0;
310
311 skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
312 if (!skb)
313 return -ENOMEM;
314
315 skb_reserve(skb, headroom);
316
317 if (cmd_len != 0 && cmd_buf != NULL) {
318 skb_put_data(skb, cmd_buf, cmd_len);
319 }
320
321 mutex_lock(&wmi->op_mutex);
322
323 /* check if wmi stopped flag is set */
324 if (unlikely(wmi->stopped)) {
325 ret = -EPROTO;
326 goto out;
327 }
328
329 /* record the rsp buffer and length */
330 wmi->cmd_rsp_buf = rsp_buf;
331 wmi->cmd_rsp_len = rsp_len;
332
333 ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
334 if (ret)
335 goto out;
336
337 time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
338 if (!time_left) {
339 ath_dbg(common, WMI, "Timeout waiting for WMI command: %s\n",
340 wmi_cmd_to_name(cmd_id));
341 mutex_unlock(&wmi->op_mutex);
342 return -ETIMEDOUT;
343 }
344
345 mutex_unlock(&wmi->op_mutex);
346
347 return 0;
348
349out:
350 ath_dbg(common, WMI, "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
351 mutex_unlock(&wmi->op_mutex);
352 kfree_skb(skb);
353
354 return ret;
355}