1 /*
2 * This file contains the handling of command
3 * responses as well as events generated by firmware.
4 */
5
6 #include <linux/hardirq.h>
7 #include <linux/slab.h>
8 #include <linux/delay.h>
9 #include <linux/sched.h>
10 #include <asm/unaligned.h>
11 #include <net/cfg80211.h>
12
13 #include "cfg.h"
14 #include "cmd.h"
15
16 /**
17 * lbs_mac_event_disconnected - handles disconnect event. It
18 * reports disconnect to upper layer, clean tx/rx packets,
19 * reset link state etc.
20 *
21 * @priv: A pointer to struct lbs_private structure
22 *
23 * returns: n/a
24 */
lbs_mac_event_disconnected(struct lbs_private * priv)25 void lbs_mac_event_disconnected(struct lbs_private *priv)
26 {
27 if (priv->connect_status != LBS_CONNECTED)
28 return;
29
30 lbs_deb_enter(LBS_DEB_ASSOC);
31
32 /*
33 * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
34 * It causes problem in the Supplicant
35 */
36 msleep_interruptible(1000);
37
38 if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
39 lbs_send_disconnect_notification(priv);
40
41 /* report disconnect to upper layer */
42 netif_stop_queue(priv->dev);
43 netif_carrier_off(priv->dev);
44
45 /* Free Tx and Rx packets */
46 kfree_skb(priv->currenttxskb);
47 priv->currenttxskb = NULL;
48 priv->tx_pending_len = 0;
49
50 priv->connect_status = LBS_DISCONNECTED;
51
52 if (priv->psstate != PS_STATE_FULL_POWER) {
53 /* make firmware to exit PS mode */
54 lbs_deb_cmd("disconnected, so exit PS mode\n");
55 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
56 }
57 lbs_deb_leave(LBS_DEB_ASSOC);
58 }
59
lbs_process_command_response(struct lbs_private * priv,u8 * data,u32 len)60 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
61 {
62 uint16_t respcmd, curcmd;
63 struct cmd_header *resp;
64 int ret = 0;
65 unsigned long flags;
66 uint16_t result;
67
68 lbs_deb_enter(LBS_DEB_HOST);
69
70 mutex_lock(&priv->lock);
71 spin_lock_irqsave(&priv->driver_lock, flags);
72
73 if (!priv->cur_cmd) {
74 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
75 ret = -1;
76 spin_unlock_irqrestore(&priv->driver_lock, flags);
77 goto done;
78 }
79
80 resp = (void *)data;
81 curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
82 respcmd = le16_to_cpu(resp->command);
83 result = le16_to_cpu(resp->result);
84
85 lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
86 respcmd, le16_to_cpu(resp->seqnum), len);
87 lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
88
89 if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
90 netdev_info(priv->dev,
91 "Received CMD_RESP with invalid sequence %d (expected %d)\n",
92 le16_to_cpu(resp->seqnum),
93 le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
94 spin_unlock_irqrestore(&priv->driver_lock, flags);
95 ret = -1;
96 goto done;
97 }
98 if (respcmd != CMD_RET(curcmd) &&
99 respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
100 netdev_info(priv->dev, "Invalid CMD_RESP %x to command %x!\n",
101 respcmd, curcmd);
102 spin_unlock_irqrestore(&priv->driver_lock, flags);
103 ret = -1;
104 goto done;
105 }
106
107 if (resp->result == cpu_to_le16(0x0004)) {
108 /* 0x0004 means -EAGAIN. Drop the response, let it time out
109 and be resubmitted */
110 netdev_info(priv->dev,
111 "Firmware returns DEFER to command %x. Will let it time out...\n",
112 le16_to_cpu(resp->command));
113 spin_unlock_irqrestore(&priv->driver_lock, flags);
114 ret = -1;
115 goto done;
116 }
117
118 /* Now we got response from FW, cancel the command timer */
119 del_timer(&priv->command_timer);
120 priv->cmd_timed_out = 0;
121
122 if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
123 struct cmd_ds_802_11_ps_mode *psmode = (void *) &resp[1];
124 u16 action = le16_to_cpu(psmode->action);
125
126 lbs_deb_host(
127 "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
128 result, action);
129
130 if (result) {
131 lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
132 result);
133 /*
134 * We should not re-try enter-ps command in
135 * ad-hoc mode. It takes place in
136 * lbs_execute_next_command().
137 */
138 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
139 action == PS_MODE_ACTION_ENTER_PS)
140 priv->psmode = LBS802_11POWERMODECAM;
141 } else if (action == PS_MODE_ACTION_ENTER_PS) {
142 priv->needtowakeup = 0;
143 priv->psstate = PS_STATE_AWAKE;
144
145 lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
146 if (priv->connect_status != LBS_CONNECTED) {
147 /*
148 * When Deauth Event received before Enter_PS command
149 * response, We need to wake up the firmware.
150 */
151 lbs_deb_host(
152 "disconnected, invoking lbs_ps_wakeup\n");
153
154 spin_unlock_irqrestore(&priv->driver_lock, flags);
155 mutex_unlock(&priv->lock);
156 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS,
157 false);
158 mutex_lock(&priv->lock);
159 spin_lock_irqsave(&priv->driver_lock, flags);
160 }
161 } else if (action == PS_MODE_ACTION_EXIT_PS) {
162 priv->needtowakeup = 0;
163 priv->psstate = PS_STATE_FULL_POWER;
164 lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
165 } else {
166 lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
167 }
168
169 __lbs_complete_command(priv, priv->cur_cmd, result);
170 spin_unlock_irqrestore(&priv->driver_lock, flags);
171
172 ret = 0;
173 goto done;
174 }
175
176 /* If the command is not successful, cleanup and return failure */
177 if ((result != 0 || !(respcmd & 0x8000))) {
178 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
179 result, respcmd);
180 /*
181 * Handling errors here
182 */
183 switch (respcmd) {
184 case CMD_RET(CMD_GET_HW_SPEC):
185 case CMD_RET(CMD_802_11_RESET):
186 lbs_deb_host("CMD_RESP: reset failed\n");
187 break;
188
189 }
190 __lbs_complete_command(priv, priv->cur_cmd, result);
191 spin_unlock_irqrestore(&priv->driver_lock, flags);
192
193 ret = -1;
194 goto done;
195 }
196
197 spin_unlock_irqrestore(&priv->driver_lock, flags);
198
199 if (priv->cur_cmd && priv->cur_cmd->callback) {
200 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
201 resp);
202 }
203
204 spin_lock_irqsave(&priv->driver_lock, flags);
205
206 if (priv->cur_cmd) {
207 /* Clean up and Put current command back to cmdfreeq */
208 __lbs_complete_command(priv, priv->cur_cmd, result);
209 }
210 spin_unlock_irqrestore(&priv->driver_lock, flags);
211
212 done:
213 mutex_unlock(&priv->lock);
214 lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
215 return ret;
216 }
217
lbs_process_event(struct lbs_private * priv,u32 event)218 int lbs_process_event(struct lbs_private *priv, u32 event)
219 {
220 int ret = 0;
221 struct cmd_header cmd;
222
223 lbs_deb_enter(LBS_DEB_CMD);
224
225 switch (event) {
226 case MACREG_INT_CODE_LINK_SENSED:
227 lbs_deb_cmd("EVENT: link sensed\n");
228 break;
229
230 case MACREG_INT_CODE_DEAUTHENTICATED:
231 lbs_deb_cmd("EVENT: deauthenticated\n");
232 lbs_mac_event_disconnected(priv);
233 break;
234
235 case MACREG_INT_CODE_DISASSOCIATED:
236 lbs_deb_cmd("EVENT: disassociated\n");
237 lbs_mac_event_disconnected(priv);
238 break;
239
240 case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
241 lbs_deb_cmd("EVENT: link lost\n");
242 lbs_mac_event_disconnected(priv);
243 break;
244
245 case MACREG_INT_CODE_PS_SLEEP:
246 lbs_deb_cmd("EVENT: ps sleep\n");
247
248 /* handle unexpected PS SLEEP event */
249 if (priv->psstate == PS_STATE_FULL_POWER) {
250 lbs_deb_cmd(
251 "EVENT: in FULL POWER mode, ignoreing PS_SLEEP\n");
252 break;
253 }
254 priv->psstate = PS_STATE_PRE_SLEEP;
255
256 lbs_ps_confirm_sleep(priv);
257
258 break;
259
260 case MACREG_INT_CODE_HOST_AWAKE:
261 lbs_deb_cmd("EVENT: host awake\n");
262 if (priv->reset_deep_sleep_wakeup)
263 priv->reset_deep_sleep_wakeup(priv);
264 priv->is_deep_sleep = 0;
265 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
266 sizeof(cmd));
267 priv->is_host_sleep_activated = 0;
268 wake_up_interruptible(&priv->host_sleep_q);
269 break;
270
271 case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
272 if (priv->reset_deep_sleep_wakeup)
273 priv->reset_deep_sleep_wakeup(priv);
274 lbs_deb_cmd("EVENT: ds awake\n");
275 priv->is_deep_sleep = 0;
276 priv->wakeup_dev_required = 0;
277 wake_up_interruptible(&priv->ds_awake_q);
278 break;
279
280 case MACREG_INT_CODE_PS_AWAKE:
281 lbs_deb_cmd("EVENT: ps awake\n");
282 /* handle unexpected PS AWAKE event */
283 if (priv->psstate == PS_STATE_FULL_POWER) {
284 lbs_deb_cmd(
285 "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
286 break;
287 }
288
289 priv->psstate = PS_STATE_AWAKE;
290
291 if (priv->needtowakeup) {
292 /*
293 * wait for the command processing to finish
294 * before resuming sending
295 * priv->needtowakeup will be set to FALSE
296 * in lbs_ps_wakeup()
297 */
298 lbs_deb_cmd("waking up ...\n");
299 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
300 }
301 break;
302
303 case MACREG_INT_CODE_MIC_ERR_UNICAST:
304 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
305 lbs_send_mic_failureevent(priv, event);
306 break;
307
308 case MACREG_INT_CODE_MIC_ERR_MULTICAST:
309 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
310 lbs_send_mic_failureevent(priv, event);
311 break;
312
313 case MACREG_INT_CODE_MIB_CHANGED:
314 lbs_deb_cmd("EVENT: MIB CHANGED\n");
315 break;
316 case MACREG_INT_CODE_INIT_DONE:
317 lbs_deb_cmd("EVENT: INIT DONE\n");
318 break;
319 case MACREG_INT_CODE_ADHOC_BCN_LOST:
320 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
321 break;
322 case MACREG_INT_CODE_RSSI_LOW:
323 netdev_alert(priv->dev, "EVENT: rssi low\n");
324 break;
325 case MACREG_INT_CODE_SNR_LOW:
326 netdev_alert(priv->dev, "EVENT: snr low\n");
327 break;
328 case MACREG_INT_CODE_MAX_FAIL:
329 netdev_alert(priv->dev, "EVENT: max fail\n");
330 break;
331 case MACREG_INT_CODE_RSSI_HIGH:
332 netdev_alert(priv->dev, "EVENT: rssi high\n");
333 break;
334 case MACREG_INT_CODE_SNR_HIGH:
335 netdev_alert(priv->dev, "EVENT: snr high\n");
336 break;
337
338 case MACREG_INT_CODE_MESH_AUTO_STARTED:
339 /* Ignore spurious autostart events */
340 netdev_info(priv->dev, "EVENT: MESH_AUTO_STARTED (ignoring)\n");
341 break;
342
343 default:
344 netdev_alert(priv->dev, "EVENT: unknown event id %d\n", event);
345 break;
346 }
347
348 lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
349 return ret;
350 }
351