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