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/drivers/net/wireless/libertas/cmdresp.c

http://github.com/mirrors/linux
C | 350 lines | 249 code | 55 blank | 46 comment | 46 complexity | a4afbbd1e77d6fa3ba7f21051d879f34 MD5 | raw file
  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 */
 25void 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
 60int 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
212done:
213	mutex_unlock(&priv->lock);
214	lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
215	return ret;
216}
217
218int 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}