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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_setup(&wmi->wmi_event_tasklet, ath9k_wmi_event_tasklet);
110
111 return wmi;
112}
113
114void ath9k_stop_wmi(struct ath9k_htc_priv *priv)
115{
116 struct wmi *wmi = priv->wmi;
117
118 mutex_lock(&wmi->op_mutex);
119 wmi->stopped = true;
120 mutex_unlock(&wmi->op_mutex);
121}
122
123void ath9k_destroy_wmi(struct ath9k_htc_priv *priv)
124{
125 kfree(priv->wmi);
126}
127
128void ath9k_wmi_event_drain(struct ath9k_htc_priv *priv)
129{
130 unsigned long flags;
131
132 tasklet_kill(&priv->wmi->wmi_event_tasklet);
133 spin_lock_irqsave(&priv->wmi->wmi_lock, flags);
134 __skb_queue_purge(&priv->wmi->wmi_event_queue);
135 spin_unlock_irqrestore(&priv->wmi->wmi_lock, flags);
136}
137
138void ath9k_wmi_event_tasklet(struct tasklet_struct *t)
139{
140 struct wmi *wmi = from_tasklet(wmi, t, wmi_event_tasklet);
141 struct ath9k_htc_priv *priv = wmi->drv_priv;
142 struct wmi_cmd_hdr *hdr;
143 void *wmi_event;
144 struct wmi_event_swba *swba;
145 struct sk_buff *skb = NULL;
146 unsigned long flags;
147 u16 cmd_id;
148
149 do {
150 spin_lock_irqsave(&wmi->wmi_lock, flags);
151 skb = __skb_dequeue(&wmi->wmi_event_queue);
152 if (!skb) {
153 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
154 return;
155 }
156 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
157
158 hdr = (struct wmi_cmd_hdr *) skb->data;
159 cmd_id = be16_to_cpu(hdr->command_id);
160 wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
161
162 switch (cmd_id) {
163 case WMI_SWBA_EVENTID:
164 swba = wmi_event;
165 ath9k_htc_swba(priv, swba);
166 break;
167 case WMI_FATAL_EVENTID:
168 ieee80211_queue_work(wmi->drv_priv->hw,
169 &wmi->drv_priv->fatal_work);
170 break;
171 case WMI_TXSTATUS_EVENTID:
172 spin_lock_bh(&priv->tx.tx_lock);
173 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
174 spin_unlock_bh(&priv->tx.tx_lock);
175 break;
176 }
177 spin_unlock_bh(&priv->tx.tx_lock);
178
179 ath9k_htc_txstatus(priv, wmi_event);
180 break;
181 default:
182 break;
183 }
184
185 kfree_skb(skb);
186 } while (1);
187}
188
189void ath9k_fatal_work(struct work_struct *work)
190{
191 struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
192 fatal_work);
193 struct ath_common *common = ath9k_hw_common(priv->ah);
194
195 ath_dbg(common, FATAL, "FATAL Event received, resetting device\n");
196 ath9k_htc_reset(priv);
197}
198
199static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
200{
201 skb_pull(skb, sizeof(struct wmi_cmd_hdr));
202
203 if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
204 memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
205
206 complete(&wmi->cmd_wait);
207}
208
209static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
210 enum htc_endpoint_id epid)
211{
212 struct wmi *wmi = priv;
213 struct wmi_cmd_hdr *hdr;
214 unsigned long flags;
215 u16 cmd_id;
216
217 if (unlikely(wmi->stopped))
218 goto free_skb;
219
220 hdr = (struct wmi_cmd_hdr *) skb->data;
221 cmd_id = be16_to_cpu(hdr->command_id);
222
223 if (cmd_id & 0x1000) {
224 spin_lock_irqsave(&wmi->wmi_lock, flags);
225 __skb_queue_tail(&wmi->wmi_event_queue, skb);
226 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
227 tasklet_schedule(&wmi->wmi_event_tasklet);
228 return;
229 }
230
231 /* Check if there has been a timeout. */
232 spin_lock_irqsave(&wmi->wmi_lock, flags);
233 if (be16_to_cpu(hdr->seq_no) != wmi->last_seq_id) {
234 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
235 goto free_skb;
236 }
237 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
238
239 /* WMI command response */
240 ath9k_wmi_rsp_callback(wmi, skb);
241
242free_skb:
243 kfree_skb(skb);
244}
245
246static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
247 enum htc_endpoint_id epid, bool txok)
248{
249 kfree_skb(skb);
250}
251
252int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
253 enum htc_endpoint_id *wmi_ctrl_epid)
254{
255 struct htc_service_connreq connect;
256 int ret;
257
258 wmi->htc = htc;
259
260 memset(&connect, 0, sizeof(connect));
261
262 connect.ep_callbacks.priv = wmi;
263 connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
264 connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
265 connect.service_id = WMI_CONTROL_SVC;
266
267 ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
268 if (ret)
269 return ret;
270
271 *wmi_ctrl_epid = wmi->ctrl_epid;
272
273 return 0;
274}
275
276static int ath9k_wmi_cmd_issue(struct wmi *wmi,
277 struct sk_buff *skb,
278 enum wmi_cmd_id cmd, u16 len)
279{
280 struct wmi_cmd_hdr *hdr;
281 unsigned long flags;
282
283 hdr = skb_push(skb, sizeof(struct wmi_cmd_hdr));
284 hdr->command_id = cpu_to_be16(cmd);
285 hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
286
287 spin_lock_irqsave(&wmi->wmi_lock, flags);
288 wmi->last_seq_id = wmi->tx_seq_id;
289 spin_unlock_irqrestore(&wmi->wmi_lock, flags);
290
291 return htc_send_epid(wmi->htc, skb, wmi->ctrl_epid);
292}
293
294int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
295 u8 *cmd_buf, u32 cmd_len,
296 u8 *rsp_buf, u32 rsp_len,
297 u32 timeout)
298{
299 struct ath_hw *ah = wmi->drv_priv->ah;
300 struct ath_common *common = ath9k_hw_common(ah);
301 u16 headroom = sizeof(struct htc_frame_hdr) +
302 sizeof(struct wmi_cmd_hdr);
303 struct sk_buff *skb;
304 unsigned long time_left;
305 int ret = 0;
306
307 if (ah->ah_flags & AH_UNPLUGGED)
308 return 0;
309
310 skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
311 if (!skb)
312 return -ENOMEM;
313
314 skb_reserve(skb, headroom);
315
316 if (cmd_len != 0 && cmd_buf != NULL) {
317 skb_put_data(skb, cmd_buf, cmd_len);
318 }
319
320 mutex_lock(&wmi->op_mutex);
321
322 /* check if wmi stopped flag is set */
323 if (unlikely(wmi->stopped)) {
324 ret = -EPROTO;
325 goto out;
326 }
327
328 /* record the rsp buffer and length */
329 wmi->cmd_rsp_buf = rsp_buf;
330 wmi->cmd_rsp_len = rsp_len;
331
332 ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
333 if (ret)
334 goto out;
335
336 time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
337 if (!time_left) {
338 ath_dbg(common, WMI, "Timeout waiting for WMI command: %s\n",
339 wmi_cmd_to_name(cmd_id));
340 mutex_unlock(&wmi->op_mutex);
341 return -ETIMEDOUT;
342 }
343
344 mutex_unlock(&wmi->op_mutex);
345
346 return 0;
347
348out:
349 ath_dbg(common, WMI, "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
350 mutex_unlock(&wmi->op_mutex);
351 kfree_skb(skb);
352
353 return ret;
354}