1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * This file contains the major functions in WLAN
4  * driver. It includes init, exit, open, close and main
5  * thread etc..
6  */
7 
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 
10 #include <linux/module.h>
11 #include <linux/delay.h>
12 #include <linux/etherdevice.h>
13 #include <linux/hardirq.h>
14 #include <linux/netdevice.h>
15 #include <linux/if_arp.h>
16 #include <linux/kthread.h>
17 #include <linux/kfifo.h>
18 #include <linux/slab.h>
19 #include <net/cfg80211.h>
20 
21 #include "host.h"
22 #include "decl.h"
23 #include "dev.h"
24 #include "cfg.h"
25 #include "debugfs.h"
26 #include "cmd.h"
27 #include "mesh.h"
28 
29 #define DRIVER_RELEASE_VERSION "323.p0"
30 const char lbs_driver_version[] = "COMM-USB8388-" DRIVER_RELEASE_VERSION
31 #ifdef  DEBUG
32     "-dbg"
33 #endif
34     "";
35 
36 
37 /* Module parameters */
38 unsigned int lbs_debug;
39 EXPORT_SYMBOL_GPL(lbs_debug);
40 module_param_named(libertas_debug, lbs_debug, int, 0644);
41 
42 static unsigned int lbs_disablemesh;
43 module_param_named(libertas_disablemesh, lbs_disablemesh, int, 0644);
44 
45 
46 /*
47  * This global structure is used to send the confirm_sleep command as
48  * fast as possible down to the firmware.
49  */
50 struct cmd_confirm_sleep confirm_sleep;
51 
52 
53 /*
54  * the table to keep region code
55  */
56 u16 lbs_region_code_to_index[MRVDRV_MAX_REGION_CODE] =
57     { 0x10, 0x20, 0x30, 0x31, 0x32, 0x40 };
58 
59 /*
60  * FW rate table.  FW refers to rates by their index in this table, not by the
61  * rate value itself.  Values of 0x00 are
62  * reserved positions.
63  */
64 static u8 fw_data_rates[MAX_RATES] =
65     { 0x02, 0x04, 0x0B, 0x16, 0x00, 0x0C, 0x12,
66       0x18, 0x24, 0x30, 0x48, 0x60, 0x6C, 0x00
67 };
68 
69 /**
70  *  lbs_fw_index_to_data_rate - use index to get the data rate
71  *
72  *  @idx:	The index of data rate
73  *  returns:	data rate or 0
74  */
lbs_fw_index_to_data_rate(u8 idx)75 u32 lbs_fw_index_to_data_rate(u8 idx)
76 {
77 	if (idx >= sizeof(fw_data_rates))
78 		idx = 0;
79 	return fw_data_rates[idx];
80 }
81 
82 /**
83  *  lbs_data_rate_to_fw_index - use rate to get the index
84  *
85  *  @rate:	data rate
86  *  returns:	index or 0
87  */
lbs_data_rate_to_fw_index(u32 rate)88 u8 lbs_data_rate_to_fw_index(u32 rate)
89 {
90 	u8 i;
91 
92 	if (!rate)
93 		return 0;
94 
95 	for (i = 0; i < sizeof(fw_data_rates); i++) {
96 		if (rate == fw_data_rates[i])
97 			return i;
98 	}
99 	return 0;
100 }
101 
lbs_set_iface_type(struct lbs_private * priv,enum nl80211_iftype type)102 int lbs_set_iface_type(struct lbs_private *priv, enum nl80211_iftype type)
103 {
104 	int ret = 0;
105 
106 	switch (type) {
107 	case NL80211_IFTYPE_MONITOR:
108 		ret = lbs_set_monitor_mode(priv, 1);
109 		break;
110 	case NL80211_IFTYPE_STATION:
111 		if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR)
112 			ret = lbs_set_monitor_mode(priv, 0);
113 		if (!ret)
114 			ret = lbs_set_snmp_mib(priv, SNMP_MIB_OID_BSS_TYPE, 1);
115 		break;
116 	case NL80211_IFTYPE_ADHOC:
117 		if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR)
118 			ret = lbs_set_monitor_mode(priv, 0);
119 		if (!ret)
120 			ret = lbs_set_snmp_mib(priv, SNMP_MIB_OID_BSS_TYPE, 2);
121 		break;
122 	default:
123 		ret = -ENOTSUPP;
124 	}
125 	return ret;
126 }
127 
lbs_start_iface(struct lbs_private * priv)128 int lbs_start_iface(struct lbs_private *priv)
129 {
130 	struct cmd_ds_802_11_mac_address cmd;
131 	int ret;
132 
133 	if (priv->power_restore) {
134 		ret = priv->power_restore(priv);
135 		if (ret)
136 			return ret;
137 	}
138 
139 	cmd.hdr.size = cpu_to_le16(sizeof(cmd));
140 	cmd.action = cpu_to_le16(CMD_ACT_SET);
141 	memcpy(cmd.macadd, priv->current_addr, ETH_ALEN);
142 
143 	ret = lbs_cmd_with_response(priv, CMD_802_11_MAC_ADDRESS, &cmd);
144 	if (ret) {
145 		lbs_deb_net("set MAC address failed\n");
146 		goto err;
147 	}
148 
149 	ret = lbs_set_iface_type(priv, priv->wdev->iftype);
150 	if (ret) {
151 		lbs_deb_net("set iface type failed\n");
152 		goto err;
153 	}
154 
155 	ret = lbs_set_11d_domain_info(priv);
156 	if (ret) {
157 		lbs_deb_net("set 11d domain info failed\n");
158 		goto err;
159 	}
160 
161 	lbs_update_channel(priv);
162 
163 	priv->iface_running = true;
164 	return 0;
165 
166 err:
167 	if (priv->power_save)
168 		priv->power_save(priv);
169 	return ret;
170 }
171 
172 /**
173  *  lbs_dev_open - open the ethX interface
174  *
175  *  @dev:	A pointer to &net_device structure
176  *  returns:	0 or -EBUSY if monitor mode active
177  */
lbs_dev_open(struct net_device * dev)178 static int lbs_dev_open(struct net_device *dev)
179 {
180 	struct lbs_private *priv = dev->ml_priv;
181 	int ret = 0;
182 
183 	if (!priv->iface_running) {
184 		ret = lbs_start_iface(priv);
185 		if (ret)
186 			goto out;
187 	}
188 
189 	spin_lock_irq(&priv->driver_lock);
190 
191 	netif_carrier_off(dev);
192 
193 	if (!priv->tx_pending_len)
194 		netif_wake_queue(dev);
195 
196 	spin_unlock_irq(&priv->driver_lock);
197 
198 out:
199 	return ret;
200 }
201 
lbs_command_queue_empty(struct lbs_private * priv)202 static bool lbs_command_queue_empty(struct lbs_private *priv)
203 {
204 	unsigned long flags;
205 	bool ret;
206 	spin_lock_irqsave(&priv->driver_lock, flags);
207 	ret = priv->cur_cmd == NULL && list_empty(&priv->cmdpendingq);
208 	spin_unlock_irqrestore(&priv->driver_lock, flags);
209 	return ret;
210 }
211 
lbs_stop_iface(struct lbs_private * priv)212 int lbs_stop_iface(struct lbs_private *priv)
213 {
214 	unsigned long flags;
215 	int ret = 0;
216 
217 	spin_lock_irqsave(&priv->driver_lock, flags);
218 	priv->iface_running = false;
219 	dev_kfree_skb_irq(priv->currenttxskb);
220 	priv->currenttxskb = NULL;
221 	priv->tx_pending_len = 0;
222 	spin_unlock_irqrestore(&priv->driver_lock, flags);
223 
224 	cancel_work_sync(&priv->mcast_work);
225 	del_timer_sync(&priv->tx_lockup_timer);
226 
227 	/* Disable command processing, and wait for all commands to complete */
228 	lbs_deb_main("waiting for commands to complete\n");
229 	wait_event(priv->waitq, lbs_command_queue_empty(priv));
230 	lbs_deb_main("all commands completed\n");
231 
232 	if (priv->power_save)
233 		ret = priv->power_save(priv);
234 
235 	return ret;
236 }
237 
238 /**
239  *  lbs_eth_stop - close the ethX interface
240  *
241  *  @dev:	A pointer to &net_device structure
242  *  returns:	0
243  */
lbs_eth_stop(struct net_device * dev)244 static int lbs_eth_stop(struct net_device *dev)
245 {
246 	struct lbs_private *priv = dev->ml_priv;
247 
248 	if (priv->connect_status == LBS_CONNECTED)
249 		lbs_disconnect(priv, WLAN_REASON_DEAUTH_LEAVING);
250 
251 	spin_lock_irq(&priv->driver_lock);
252 	netif_stop_queue(dev);
253 	spin_unlock_irq(&priv->driver_lock);
254 
255 	lbs_update_mcast(priv);
256 	cancel_delayed_work_sync(&priv->scan_work);
257 	if (priv->scan_req)
258 		lbs_scan_done(priv);
259 
260 	netif_carrier_off(priv->dev);
261 
262 	if (!lbs_iface_active(priv))
263 		lbs_stop_iface(priv);
264 
265 	return 0;
266 }
267 
lbs_host_to_card_done(struct lbs_private * priv)268 void lbs_host_to_card_done(struct lbs_private *priv)
269 {
270 	unsigned long flags;
271 
272 	spin_lock_irqsave(&priv->driver_lock, flags);
273 	del_timer(&priv->tx_lockup_timer);
274 
275 	priv->dnld_sent = DNLD_RES_RECEIVED;
276 
277 	/* Wake main thread if commands are pending */
278 	if (!priv->cur_cmd || priv->tx_pending_len > 0) {
279 		if (!priv->wakeup_dev_required)
280 			wake_up(&priv->waitq);
281 	}
282 
283 	spin_unlock_irqrestore(&priv->driver_lock, flags);
284 }
285 EXPORT_SYMBOL_GPL(lbs_host_to_card_done);
286 
lbs_set_mac_address(struct net_device * dev,void * addr)287 int lbs_set_mac_address(struct net_device *dev, void *addr)
288 {
289 	int ret = 0;
290 	struct lbs_private *priv = dev->ml_priv;
291 	struct sockaddr *phwaddr = addr;
292 
293 	/*
294 	 * Can only set MAC address when all interfaces are down, to be written
295 	 * to the hardware when one of them is brought up.
296 	 */
297 	if (lbs_iface_active(priv))
298 		return -EBUSY;
299 
300 	/* In case it was called from the mesh device */
301 	dev = priv->dev;
302 
303 	memcpy(priv->current_addr, phwaddr->sa_data, ETH_ALEN);
304 	eth_hw_addr_set(dev, phwaddr->sa_data);
305 	if (priv->mesh_dev)
306 		eth_hw_addr_set(priv->mesh_dev, phwaddr->sa_data);
307 
308 	return ret;
309 }
310 
311 
mac_in_list(unsigned char * list,int list_len,unsigned char * mac)312 static inline int mac_in_list(unsigned char *list, int list_len,
313 			      unsigned char *mac)
314 {
315 	while (list_len) {
316 		if (!memcmp(list, mac, ETH_ALEN))
317 			return 1;
318 		list += ETH_ALEN;
319 		list_len--;
320 	}
321 	return 0;
322 }
323 
324 
lbs_add_mcast_addrs(struct cmd_ds_mac_multicast_adr * cmd,struct net_device * dev,int nr_addrs)325 static int lbs_add_mcast_addrs(struct cmd_ds_mac_multicast_adr *cmd,
326 			       struct net_device *dev, int nr_addrs)
327 {
328 	int i = nr_addrs;
329 	struct netdev_hw_addr *ha;
330 	int cnt;
331 
332 	if ((dev->flags & (IFF_UP|IFF_MULTICAST)) != (IFF_UP|IFF_MULTICAST))
333 		return nr_addrs;
334 
335 	netif_addr_lock_bh(dev);
336 	cnt = netdev_mc_count(dev);
337 	netdev_for_each_mc_addr(ha, dev) {
338 		if (mac_in_list(cmd->maclist, nr_addrs, ha->addr)) {
339 			lbs_deb_net("mcast address %s:%pM skipped\n", dev->name,
340 				    ha->addr);
341 			cnt--;
342 			continue;
343 		}
344 
345 		if (i == MRVDRV_MAX_MULTICAST_LIST_SIZE)
346 			break;
347 		memcpy(&cmd->maclist[6*i], ha->addr, ETH_ALEN);
348 		lbs_deb_net("mcast address %s:%pM added to filter\n", dev->name,
349 			    ha->addr);
350 		i++;
351 		cnt--;
352 	}
353 	netif_addr_unlock_bh(dev);
354 	if (cnt)
355 		return -EOVERFLOW;
356 
357 	return i;
358 }
359 
lbs_update_mcast(struct lbs_private * priv)360 void lbs_update_mcast(struct lbs_private *priv)
361 {
362 	struct cmd_ds_mac_multicast_adr mcast_cmd;
363 	int dev_flags = 0;
364 	int nr_addrs;
365 	int old_mac_control = priv->mac_control;
366 
367 	if (netif_running(priv->dev))
368 		dev_flags |= priv->dev->flags;
369 	if (priv->mesh_dev && netif_running(priv->mesh_dev))
370 		dev_flags |= priv->mesh_dev->flags;
371 
372 	if (dev_flags & IFF_PROMISC) {
373 		priv->mac_control |= CMD_ACT_MAC_PROMISCUOUS_ENABLE;
374 		priv->mac_control &= ~(CMD_ACT_MAC_ALL_MULTICAST_ENABLE |
375 				       CMD_ACT_MAC_MULTICAST_ENABLE);
376 		goto out_set_mac_control;
377 	} else if (dev_flags & IFF_ALLMULTI) {
378 	do_allmulti:
379 		priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
380 		priv->mac_control &= ~(CMD_ACT_MAC_PROMISCUOUS_ENABLE |
381 				       CMD_ACT_MAC_MULTICAST_ENABLE);
382 		goto out_set_mac_control;
383 	}
384 
385 	/* Once for priv->dev, again for priv->mesh_dev if it exists */
386 	nr_addrs = lbs_add_mcast_addrs(&mcast_cmd, priv->dev, 0);
387 	if (nr_addrs >= 0 && priv->mesh_dev)
388 		nr_addrs = lbs_add_mcast_addrs(&mcast_cmd, priv->mesh_dev, nr_addrs);
389 	if (nr_addrs < 0)
390 		goto do_allmulti;
391 
392 	if (nr_addrs) {
393 		int size = offsetof(struct cmd_ds_mac_multicast_adr,
394 				    maclist[6*nr_addrs]);
395 
396 		mcast_cmd.action = cpu_to_le16(CMD_ACT_SET);
397 		mcast_cmd.hdr.size = cpu_to_le16(size);
398 		mcast_cmd.nr_of_adrs = cpu_to_le16(nr_addrs);
399 
400 		lbs_cmd_async(priv, CMD_MAC_MULTICAST_ADR, &mcast_cmd.hdr, size);
401 
402 		priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
403 	} else
404 		priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
405 
406 	priv->mac_control &= ~(CMD_ACT_MAC_PROMISCUOUS_ENABLE |
407 			       CMD_ACT_MAC_ALL_MULTICAST_ENABLE);
408  out_set_mac_control:
409 	if (priv->mac_control != old_mac_control)
410 		lbs_set_mac_control(priv);
411 }
412 
lbs_set_mcast_worker(struct work_struct * work)413 static void lbs_set_mcast_worker(struct work_struct *work)
414 {
415 	struct lbs_private *priv = container_of(work, struct lbs_private, mcast_work);
416 	lbs_update_mcast(priv);
417 }
418 
lbs_set_multicast_list(struct net_device * dev)419 void lbs_set_multicast_list(struct net_device *dev)
420 {
421 	struct lbs_private *priv = dev->ml_priv;
422 
423 	schedule_work(&priv->mcast_work);
424 }
425 
426 /**
427  *  lbs_thread - handles the major jobs in the LBS driver.
428  *  It handles all events generated by firmware, RX data received
429  *  from firmware and TX data sent from kernel.
430  *
431  *  @data:	A pointer to &lbs_thread structure
432  *  returns:	0
433  */
lbs_thread(void * data)434 static int lbs_thread(void *data)
435 {
436 	struct net_device *dev = data;
437 	struct lbs_private *priv = dev->ml_priv;
438 	wait_queue_entry_t wait;
439 
440 	init_waitqueue_entry(&wait, current);
441 
442 	for (;;) {
443 		int shouldsleep;
444 		u8 resp_idx;
445 
446 		lbs_deb_thread("1: currenttxskb %p, dnld_sent %d\n",
447 				priv->currenttxskb, priv->dnld_sent);
448 
449 		add_wait_queue(&priv->waitq, &wait);
450 		set_current_state(TASK_INTERRUPTIBLE);
451 		spin_lock_irq(&priv->driver_lock);
452 
453 		if (kthread_should_stop())
454 			shouldsleep = 0;	/* Bye */
455 		else if (priv->surpriseremoved)
456 			shouldsleep = 1;	/* We need to wait until we're _told_ to die */
457 		else if (priv->psstate == PS_STATE_SLEEP)
458 			shouldsleep = 1;	/* Sleep mode. Nothing we can do till it wakes */
459 		else if (priv->cmd_timed_out)
460 			shouldsleep = 0;	/* Command timed out. Recover */
461 		else if (!priv->fw_ready)
462 			shouldsleep = 1;	/* Firmware not ready. We're waiting for it */
463 		else if (priv->dnld_sent)
464 			shouldsleep = 1;	/* Something is en route to the device already */
465 		else if (priv->tx_pending_len > 0)
466 			shouldsleep = 0;	/* We've a packet to send */
467 		else if (priv->resp_len[priv->resp_idx])
468 			shouldsleep = 0;	/* We have a command response */
469 		else if (priv->cur_cmd)
470 			shouldsleep = 1;	/* Can't send a command; one already running */
471 		else if (!list_empty(&priv->cmdpendingq) &&
472 					!(priv->wakeup_dev_required))
473 			shouldsleep = 0;	/* We have a command to send */
474 		else if (kfifo_len(&priv->event_fifo))
475 			shouldsleep = 0;	/* We have an event to process */
476 		else
477 			shouldsleep = 1;	/* No command */
478 
479 		if (shouldsleep) {
480 			lbs_deb_thread("sleeping, connect_status %d, "
481 				"psmode %d, psstate %d\n",
482 				priv->connect_status,
483 				priv->psmode, priv->psstate);
484 			spin_unlock_irq(&priv->driver_lock);
485 			schedule();
486 		} else
487 			spin_unlock_irq(&priv->driver_lock);
488 
489 		lbs_deb_thread("2: currenttxskb %p, dnld_send %d\n",
490 			       priv->currenttxskb, priv->dnld_sent);
491 
492 		set_current_state(TASK_RUNNING);
493 		remove_wait_queue(&priv->waitq, &wait);
494 
495 		lbs_deb_thread("3: currenttxskb %p, dnld_sent %d\n",
496 			       priv->currenttxskb, priv->dnld_sent);
497 
498 		if (kthread_should_stop()) {
499 			lbs_deb_thread("break from main thread\n");
500 			break;
501 		}
502 
503 		if (priv->surpriseremoved) {
504 			lbs_deb_thread("adapter removed; waiting to die...\n");
505 			continue;
506 		}
507 
508 		lbs_deb_thread("4: currenttxskb %p, dnld_sent %d\n",
509 		       priv->currenttxskb, priv->dnld_sent);
510 
511 		/* Process any pending command response */
512 		spin_lock_irq(&priv->driver_lock);
513 		resp_idx = priv->resp_idx;
514 		if (priv->resp_len[resp_idx]) {
515 			spin_unlock_irq(&priv->driver_lock);
516 			lbs_process_command_response(priv,
517 				priv->resp_buf[resp_idx],
518 				priv->resp_len[resp_idx]);
519 			spin_lock_irq(&priv->driver_lock);
520 			priv->resp_len[resp_idx] = 0;
521 		}
522 		spin_unlock_irq(&priv->driver_lock);
523 
524 		/* Process hardware events, e.g. card removed, link lost */
525 		spin_lock_irq(&priv->driver_lock);
526 		while (kfifo_len(&priv->event_fifo)) {
527 			u32 event;
528 
529 			if (kfifo_out(&priv->event_fifo,
530 				(unsigned char *) &event, sizeof(event)) !=
531 				sizeof(event))
532 					break;
533 			spin_unlock_irq(&priv->driver_lock);
534 			lbs_process_event(priv, event);
535 			spin_lock_irq(&priv->driver_lock);
536 		}
537 		spin_unlock_irq(&priv->driver_lock);
538 
539 		if (priv->wakeup_dev_required) {
540 			lbs_deb_thread("Waking up device...\n");
541 			/* Wake up device */
542 			if (priv->exit_deep_sleep(priv))
543 				lbs_deb_thread("Wakeup device failed\n");
544 			continue;
545 		}
546 
547 		/* command timeout stuff */
548 		if (priv->cmd_timed_out && priv->cur_cmd) {
549 			struct cmd_ctrl_node *cmdnode = priv->cur_cmd;
550 
551 			netdev_info(dev, "Timeout submitting command 0x%04x\n",
552 				    le16_to_cpu(cmdnode->cmdbuf->command));
553 			lbs_complete_command(priv, cmdnode, -ETIMEDOUT);
554 
555 			/* Reset card, but only when it isn't in the process
556 			 * of being shutdown anyway. */
557 			if (!dev->dismantle && priv->reset_card)
558 				priv->reset_card(priv);
559 		}
560 		priv->cmd_timed_out = 0;
561 
562 		if (!priv->fw_ready)
563 			continue;
564 
565 		/* Check if we need to confirm Sleep Request received previously */
566 		if (priv->psstate == PS_STATE_PRE_SLEEP &&
567 		    !priv->dnld_sent && !priv->cur_cmd) {
568 			if (priv->connect_status == LBS_CONNECTED) {
569 				lbs_deb_thread("pre-sleep, currenttxskb %p, "
570 					"dnld_sent %d, cur_cmd %p\n",
571 					priv->currenttxskb, priv->dnld_sent,
572 					priv->cur_cmd);
573 
574 				lbs_ps_confirm_sleep(priv);
575 			} else {
576 				/* workaround for firmware sending
577 				 * deauth/linkloss event immediately
578 				 * after sleep request; remove this
579 				 * after firmware fixes it
580 				 */
581 				priv->psstate = PS_STATE_AWAKE;
582 				netdev_alert(dev,
583 					     "ignore PS_SleepConfirm in non-connected state\n");
584 			}
585 		}
586 
587 		/* The PS state is changed during processing of Sleep Request
588 		 * event above
589 		 */
590 		if ((priv->psstate == PS_STATE_SLEEP) ||
591 		    (priv->psstate == PS_STATE_PRE_SLEEP))
592 			continue;
593 
594 		if (priv->is_deep_sleep)
595 			continue;
596 
597 		/* Execute the next command */
598 		if (!priv->dnld_sent && !priv->cur_cmd)
599 			lbs_execute_next_command(priv);
600 
601 		spin_lock_irq(&priv->driver_lock);
602 		if (!priv->dnld_sent && priv->tx_pending_len > 0) {
603 			int ret = priv->hw_host_to_card(priv, MVMS_DAT,
604 							priv->tx_pending_buf,
605 							priv->tx_pending_len);
606 			if (ret) {
607 				lbs_deb_tx("host_to_card failed %d\n", ret);
608 				priv->dnld_sent = DNLD_RES_RECEIVED;
609 			} else {
610 				mod_timer(&priv->tx_lockup_timer,
611 					  jiffies + (HZ * 5));
612 			}
613 			priv->tx_pending_len = 0;
614 			if (!priv->currenttxskb) {
615 				/* We can wake the queues immediately if we aren't
616 				   waiting for TX feedback */
617 				if (priv->connect_status == LBS_CONNECTED)
618 					netif_wake_queue(priv->dev);
619 				if (priv->mesh_dev &&
620 				    netif_running(priv->mesh_dev))
621 					netif_wake_queue(priv->mesh_dev);
622 			}
623 		}
624 		spin_unlock_irq(&priv->driver_lock);
625 	}
626 
627 	del_timer(&priv->command_timer);
628 	del_timer(&priv->tx_lockup_timer);
629 	del_timer(&priv->auto_deepsleep_timer);
630 
631 	return 0;
632 }
633 
634 /**
635  * lbs_setup_firmware - gets the HW spec from the firmware and sets
636  *        some basic parameters
637  *
638  *  @priv:	A pointer to &struct lbs_private structure
639  *  returns:	0 or -1
640  */
lbs_setup_firmware(struct lbs_private * priv)641 static int lbs_setup_firmware(struct lbs_private *priv)
642 {
643 	int ret = -1;
644 	s16 curlevel = 0, minlevel = 0, maxlevel = 0;
645 
646 	/* Read MAC address from firmware */
647 	eth_broadcast_addr(priv->current_addr);
648 	ret = lbs_update_hw_spec(priv);
649 	if (ret)
650 		goto done;
651 
652 	/* Read power levels if available */
653 	ret = lbs_get_tx_power(priv, &curlevel, &minlevel, &maxlevel);
654 	if (ret == 0) {
655 		priv->txpower_cur = curlevel;
656 		priv->txpower_min = minlevel;
657 		priv->txpower_max = maxlevel;
658 	}
659 
660 	/* Send cmd to FW to enable 11D function */
661 	ret = lbs_set_snmp_mib(priv, SNMP_MIB_OID_11D_ENABLE, 1);
662 	if (ret)
663 		goto done;
664 
665 	ret = lbs_set_mac_control_sync(priv);
666 done:
667 	return ret;
668 }
669 
lbs_suspend(struct lbs_private * priv)670 int lbs_suspend(struct lbs_private *priv)
671 {
672 	int ret;
673 
674 	if (priv->is_deep_sleep) {
675 		ret = lbs_set_deep_sleep(priv, 0);
676 		if (ret) {
677 			netdev_err(priv->dev,
678 				   "deep sleep cancellation failed: %d\n", ret);
679 			return ret;
680 		}
681 		priv->deep_sleep_required = 1;
682 	}
683 
684 	ret = lbs_set_host_sleep(priv, 1);
685 
686 	netif_device_detach(priv->dev);
687 	if (priv->mesh_dev)
688 		netif_device_detach(priv->mesh_dev);
689 
690 	return ret;
691 }
692 EXPORT_SYMBOL_GPL(lbs_suspend);
693 
lbs_resume(struct lbs_private * priv)694 int lbs_resume(struct lbs_private *priv)
695 {
696 	int ret;
697 
698 	ret = lbs_set_host_sleep(priv, 0);
699 
700 	netif_device_attach(priv->dev);
701 	if (priv->mesh_dev)
702 		netif_device_attach(priv->mesh_dev);
703 
704 	if (priv->deep_sleep_required) {
705 		priv->deep_sleep_required = 0;
706 		ret = lbs_set_deep_sleep(priv, 1);
707 		if (ret)
708 			netdev_err(priv->dev,
709 				   "deep sleep activation failed: %d\n", ret);
710 	}
711 
712 	if (priv->setup_fw_on_resume)
713 		ret = lbs_setup_firmware(priv);
714 
715 	return ret;
716 }
717 EXPORT_SYMBOL_GPL(lbs_resume);
718 
719 /**
720  * lbs_cmd_timeout_handler - handles the timeout of command sending.
721  * It will re-send the same command again.
722  *
723  * @t: Context from which to retrieve a &struct lbs_private pointer
724  */
lbs_cmd_timeout_handler(struct timer_list * t)725 static void lbs_cmd_timeout_handler(struct timer_list *t)
726 {
727 	struct lbs_private *priv = from_timer(priv, t, command_timer);
728 	unsigned long flags;
729 
730 	spin_lock_irqsave(&priv->driver_lock, flags);
731 
732 	if (!priv->cur_cmd)
733 		goto out;
734 
735 	netdev_info(priv->dev, "command 0x%04x timed out\n",
736 		    le16_to_cpu(priv->cur_cmd->cmdbuf->command));
737 
738 	priv->cmd_timed_out = 1;
739 
740 	/*
741 	 * If the device didn't even acknowledge the command, reset the state
742 	 * so that we don't block all future commands due to this one timeout.
743 	 */
744 	if (priv->dnld_sent == DNLD_CMD_SENT)
745 		priv->dnld_sent = DNLD_RES_RECEIVED;
746 
747 	wake_up(&priv->waitq);
748 out:
749 	spin_unlock_irqrestore(&priv->driver_lock, flags);
750 }
751 
752 /**
753  * lbs_tx_lockup_handler - handles the timeout of the passing of TX frames
754  * to the hardware. This is known to frequently happen with SD8686 when
755  * waking up after a Wake-on-WLAN-triggered resume.
756  *
757  * @t: Context from which to retrieve a &struct lbs_private pointer
758  */
lbs_tx_lockup_handler(struct timer_list * t)759 static void lbs_tx_lockup_handler(struct timer_list *t)
760 {
761 	struct lbs_private *priv = from_timer(priv, t, tx_lockup_timer);
762 	unsigned long flags;
763 
764 	spin_lock_irqsave(&priv->driver_lock, flags);
765 
766 	netdev_info(priv->dev, "TX lockup detected\n");
767 	if (priv->reset_card)
768 		priv->reset_card(priv);
769 
770 	priv->dnld_sent = DNLD_RES_RECEIVED;
771 	wake_up_interruptible(&priv->waitq);
772 
773 	spin_unlock_irqrestore(&priv->driver_lock, flags);
774 }
775 
776 /**
777  * auto_deepsleep_timer_fn - put the device back to deep sleep mode when
778  * timer expires and no activity (command, event, data etc.) is detected.
779  * @t: Context from which to retrieve a &struct lbs_private pointer
780  * returns:	N/A
781  */
auto_deepsleep_timer_fn(struct timer_list * t)782 static void auto_deepsleep_timer_fn(struct timer_list *t)
783 {
784 	struct lbs_private *priv = from_timer(priv, t, auto_deepsleep_timer);
785 
786 	if (priv->is_activity_detected) {
787 		priv->is_activity_detected = 0;
788 	} else {
789 		if (priv->is_auto_deep_sleep_enabled &&
790 		    (!priv->wakeup_dev_required) &&
791 		    (priv->connect_status != LBS_CONNECTED)) {
792 			struct cmd_header cmd;
793 
794 			lbs_deb_main("Entering auto deep sleep mode...\n");
795 			memset(&cmd, 0, sizeof(cmd));
796 			cmd.size = cpu_to_le16(sizeof(cmd));
797 			lbs_cmd_async(priv, CMD_802_11_DEEP_SLEEP, &cmd,
798 					sizeof(cmd));
799 		}
800 	}
801 	mod_timer(&priv->auto_deepsleep_timer , jiffies +
802 				(priv->auto_deep_sleep_timeout * HZ)/1000);
803 }
804 
lbs_enter_auto_deep_sleep(struct lbs_private * priv)805 int lbs_enter_auto_deep_sleep(struct lbs_private *priv)
806 {
807 	priv->is_auto_deep_sleep_enabled = 1;
808 	if (priv->is_deep_sleep)
809 		priv->wakeup_dev_required = 1;
810 	mod_timer(&priv->auto_deepsleep_timer ,
811 			jiffies + (priv->auto_deep_sleep_timeout * HZ)/1000);
812 
813 	return 0;
814 }
815 
lbs_exit_auto_deep_sleep(struct lbs_private * priv)816 int lbs_exit_auto_deep_sleep(struct lbs_private *priv)
817 {
818 	priv->is_auto_deep_sleep_enabled = 0;
819 	priv->auto_deep_sleep_timeout = 0;
820 	del_timer(&priv->auto_deepsleep_timer);
821 
822 	return 0;
823 }
824 
lbs_init_adapter(struct lbs_private * priv)825 static int lbs_init_adapter(struct lbs_private *priv)
826 {
827 	int ret;
828 
829 	eth_broadcast_addr(priv->current_addr);
830 
831 	priv->connect_status = LBS_DISCONNECTED;
832 	priv->channel = DEFAULT_AD_HOC_CHANNEL;
833 	priv->mac_control = CMD_ACT_MAC_RX_ON | CMD_ACT_MAC_TX_ON;
834 	priv->radio_on = 1;
835 	priv->psmode = LBS802_11POWERMODECAM;
836 	priv->psstate = PS_STATE_FULL_POWER;
837 	priv->is_deep_sleep = 0;
838 	priv->is_auto_deep_sleep_enabled = 0;
839 	priv->deep_sleep_required = 0;
840 	priv->wakeup_dev_required = 0;
841 	init_waitqueue_head(&priv->ds_awake_q);
842 	init_waitqueue_head(&priv->scan_q);
843 	priv->authtype_auto = 1;
844 	priv->is_host_sleep_configured = 0;
845 	priv->is_host_sleep_activated = 0;
846 	init_waitqueue_head(&priv->host_sleep_q);
847 	init_waitqueue_head(&priv->fw_waitq);
848 	mutex_init(&priv->lock);
849 
850 	timer_setup(&priv->command_timer, lbs_cmd_timeout_handler, 0);
851 	timer_setup(&priv->tx_lockup_timer, lbs_tx_lockup_handler, 0);
852 	timer_setup(&priv->auto_deepsleep_timer, auto_deepsleep_timer_fn, 0);
853 
854 	INIT_LIST_HEAD(&priv->cmdfreeq);
855 	INIT_LIST_HEAD(&priv->cmdpendingq);
856 
857 	spin_lock_init(&priv->driver_lock);
858 
859 	/* Allocate the command buffers */
860 	if (lbs_allocate_cmd_buffer(priv)) {
861 		pr_err("Out of memory allocating command buffers\n");
862 		ret = -ENOMEM;
863 		goto out;
864 	}
865 	priv->resp_idx = 0;
866 	priv->resp_len[0] = priv->resp_len[1] = 0;
867 
868 	/* Create the event FIFO */
869 	ret = kfifo_alloc(&priv->event_fifo, sizeof(u32) * 16, GFP_KERNEL);
870 	if (ret) {
871 		pr_err("Out of memory allocating event FIFO buffer\n");
872 		lbs_free_cmd_buffer(priv);
873 		goto out;
874 	}
875 
876 out:
877 	return ret;
878 }
879 
lbs_free_adapter(struct lbs_private * priv)880 static void lbs_free_adapter(struct lbs_private *priv)
881 {
882 	lbs_free_cmd_buffer(priv);
883 	kfifo_free(&priv->event_fifo);
884 	del_timer(&priv->command_timer);
885 	del_timer(&priv->tx_lockup_timer);
886 	del_timer(&priv->auto_deepsleep_timer);
887 }
888 
889 static const struct net_device_ops lbs_netdev_ops = {
890 	.ndo_open 		= lbs_dev_open,
891 	.ndo_stop		= lbs_eth_stop,
892 	.ndo_start_xmit		= lbs_hard_start_xmit,
893 	.ndo_set_mac_address	= lbs_set_mac_address,
894 	.ndo_set_rx_mode	= lbs_set_multicast_list,
895 	.ndo_validate_addr	= eth_validate_addr,
896 };
897 
898 /**
899  * lbs_add_card - adds the card. It will probe the
900  * card, allocate the lbs_priv and initialize the device.
901  *
902  * @card:	A pointer to card
903  * @dmdev:	A pointer to &struct device
904  * returns:	A pointer to &struct lbs_private structure
905  */
lbs_add_card(void * card,struct device * dmdev)906 struct lbs_private *lbs_add_card(void *card, struct device *dmdev)
907 {
908 	struct net_device *dev;
909 	struct wireless_dev *wdev;
910 	struct lbs_private *priv = NULL;
911 	int err;
912 
913 	/* Allocate an Ethernet device and register it */
914 	wdev = lbs_cfg_alloc(dmdev);
915 	if (IS_ERR(wdev)) {
916 		err = PTR_ERR(wdev);
917 		pr_err("cfg80211 init failed\n");
918 		goto err_cfg;
919 	}
920 
921 	wdev->iftype = NL80211_IFTYPE_STATION;
922 	priv = wdev_priv(wdev);
923 	priv->wdev = wdev;
924 
925 	err = lbs_init_adapter(priv);
926 	if (err) {
927 		pr_err("failed to initialize adapter structure\n");
928 		goto err_wdev;
929 	}
930 
931 	dev = alloc_netdev(0, "wlan%d", NET_NAME_UNKNOWN, ether_setup);
932 	if (!dev) {
933 		err = -ENOMEM;
934 		dev_err(dmdev, "no memory for network device instance\n");
935 		goto err_adapter;
936 	}
937 
938 	dev->ieee80211_ptr = wdev;
939 	dev->ml_priv = priv;
940 	SET_NETDEV_DEV(dev, dmdev);
941 	wdev->netdev = dev;
942 	priv->dev = dev;
943 
944 	dev->netdev_ops = &lbs_netdev_ops;
945 	dev->watchdog_timeo = 5 * HZ;
946 	dev->ethtool_ops = &lbs_ethtool_ops;
947 	dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
948 
949 	priv->card = card;
950 
951 	strcpy(dev->name, "wlan%d");
952 
953 	lbs_deb_thread("Starting main thread...\n");
954 	init_waitqueue_head(&priv->waitq);
955 	priv->main_thread = kthread_run(lbs_thread, dev, "lbs_main");
956 	if (IS_ERR(priv->main_thread)) {
957 		err = PTR_ERR(priv->main_thread);
958 		lbs_deb_thread("Error creating main thread.\n");
959 		goto err_ndev;
960 	}
961 
962 	priv->work_thread = create_singlethread_workqueue("lbs_worker");
963 	INIT_WORK(&priv->mcast_work, lbs_set_mcast_worker);
964 
965 	priv->wol_criteria = EHS_REMOVE_WAKEUP;
966 	priv->wol_gpio = 0xff;
967 	priv->wol_gap = 20;
968 	priv->ehs_remove_supported = true;
969 
970 	return priv;
971 
972  err_ndev:
973 	free_netdev(dev);
974 
975  err_adapter:
976 	lbs_free_adapter(priv);
977 
978  err_wdev:
979 	lbs_cfg_free(priv);
980 
981  err_cfg:
982 	return ERR_PTR(err);
983 }
984 EXPORT_SYMBOL_GPL(lbs_add_card);
985 
986 
lbs_remove_card(struct lbs_private * priv)987 void lbs_remove_card(struct lbs_private *priv)
988 {
989 	struct net_device *dev = priv->dev;
990 
991 	lbs_remove_mesh(priv);
992 
993 	if (priv->wiphy_registered)
994 		lbs_scan_deinit(priv);
995 
996 	lbs_wait_for_firmware_load(priv);
997 
998 	/* worker thread destruction blocks on the in-flight command which
999 	 * should have been cleared already in lbs_stop_card().
1000 	 */
1001 	lbs_deb_main("destroying worker thread\n");
1002 	destroy_workqueue(priv->work_thread);
1003 	lbs_deb_main("done destroying worker thread\n");
1004 
1005 	if (priv->psmode == LBS802_11POWERMODEMAX_PSP) {
1006 		priv->psmode = LBS802_11POWERMODECAM;
1007 		/* no need to wakeup if already woken up,
1008 		 * on suspend, this exit ps command is not processed
1009 		 * the driver hangs
1010 		 */
1011 		if (priv->psstate != PS_STATE_FULL_POWER)
1012 			lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, true);
1013 	}
1014 
1015 	if (priv->is_deep_sleep) {
1016 		priv->is_deep_sleep = 0;
1017 		wake_up_interruptible(&priv->ds_awake_q);
1018 	}
1019 
1020 	priv->is_host_sleep_configured = 0;
1021 	priv->is_host_sleep_activated = 0;
1022 	wake_up_interruptible(&priv->host_sleep_q);
1023 
1024 	/* Stop the thread servicing the interrupts */
1025 	priv->surpriseremoved = 1;
1026 	kthread_stop(priv->main_thread);
1027 
1028 	lbs_free_adapter(priv);
1029 	lbs_cfg_free(priv);
1030 	free_netdev(dev);
1031 }
1032 EXPORT_SYMBOL_GPL(lbs_remove_card);
1033 
1034 
lbs_rtap_supported(struct lbs_private * priv)1035 int lbs_rtap_supported(struct lbs_private *priv)
1036 {
1037 	if (MRVL_FW_MAJOR_REV(priv->fwrelease) == MRVL_FW_V5)
1038 		return 1;
1039 
1040 	/* newer firmware use a capability mask */
1041 	return ((MRVL_FW_MAJOR_REV(priv->fwrelease) >= MRVL_FW_V10) &&
1042 		(priv->fwcapinfo & MESH_CAPINFO_ENABLE_MASK));
1043 }
1044 
1045 
lbs_start_card(struct lbs_private * priv)1046 int lbs_start_card(struct lbs_private *priv)
1047 {
1048 	struct net_device *dev = priv->dev;
1049 	int ret;
1050 
1051 	/* poke the firmware */
1052 	ret = lbs_setup_firmware(priv);
1053 	if (ret)
1054 		goto done;
1055 
1056 	if (!lbs_disablemesh)
1057 		lbs_init_mesh(priv);
1058 	else
1059 		pr_info("%s: mesh disabled\n", dev->name);
1060 
1061 	ret = lbs_cfg_register(priv);
1062 	if (ret) {
1063 		pr_err("cannot register device\n");
1064 		goto done;
1065 	}
1066 
1067 	if (lbs_mesh_activated(priv))
1068 		lbs_start_mesh(priv);
1069 
1070 	lbs_debugfs_init_one(priv, dev);
1071 
1072 	netdev_info(dev, "Marvell WLAN 802.11 adapter\n");
1073 
1074 	ret = 0;
1075 
1076 done:
1077 	return ret;
1078 }
1079 EXPORT_SYMBOL_GPL(lbs_start_card);
1080 
1081 
lbs_stop_card(struct lbs_private * priv)1082 void lbs_stop_card(struct lbs_private *priv)
1083 {
1084 	struct net_device *dev;
1085 
1086 	if (!priv)
1087 		return;
1088 	dev = priv->dev;
1089 
1090 	/* If the netdev isn't registered, it means that lbs_start_card() was
1091 	 * never called so we have nothing to do here. */
1092 	if (dev->reg_state != NETREG_REGISTERED)
1093 		return;
1094 
1095 	netif_stop_queue(dev);
1096 	netif_carrier_off(dev);
1097 
1098 	lbs_debugfs_remove_one(priv);
1099 	lbs_deinit_mesh(priv);
1100 	unregister_netdev(dev);
1101 }
1102 EXPORT_SYMBOL_GPL(lbs_stop_card);
1103 
1104 
lbs_queue_event(struct lbs_private * priv,u32 event)1105 void lbs_queue_event(struct lbs_private *priv, u32 event)
1106 {
1107 	unsigned long flags;
1108 
1109 	spin_lock_irqsave(&priv->driver_lock, flags);
1110 
1111 	if (priv->psstate == PS_STATE_SLEEP)
1112 		priv->psstate = PS_STATE_AWAKE;
1113 
1114 	kfifo_in(&priv->event_fifo, (unsigned char *) &event, sizeof(u32));
1115 
1116 	wake_up(&priv->waitq);
1117 
1118 	spin_unlock_irqrestore(&priv->driver_lock, flags);
1119 }
1120 EXPORT_SYMBOL_GPL(lbs_queue_event);
1121 
lbs_notify_command_response(struct lbs_private * priv,u8 resp_idx)1122 void lbs_notify_command_response(struct lbs_private *priv, u8 resp_idx)
1123 {
1124 	if (priv->psstate == PS_STATE_SLEEP)
1125 		priv->psstate = PS_STATE_AWAKE;
1126 
1127 	/* Swap buffers by flipping the response index */
1128 	BUG_ON(resp_idx > 1);
1129 	priv->resp_idx = resp_idx;
1130 
1131 	wake_up(&priv->waitq);
1132 }
1133 EXPORT_SYMBOL_GPL(lbs_notify_command_response);
1134 
lbs_init_module(void)1135 static int __init lbs_init_module(void)
1136 {
1137 	memset(&confirm_sleep, 0, sizeof(confirm_sleep));
1138 	confirm_sleep.hdr.command = cpu_to_le16(CMD_802_11_PS_MODE);
1139 	confirm_sleep.hdr.size = cpu_to_le16(sizeof(confirm_sleep));
1140 	confirm_sleep.action = cpu_to_le16(PS_MODE_ACTION_SLEEP_CONFIRMED);
1141 	lbs_debugfs_init();
1142 
1143 	return 0;
1144 }
1145 
lbs_exit_module(void)1146 static void __exit lbs_exit_module(void)
1147 {
1148 	lbs_debugfs_remove();
1149 }
1150 
1151 module_init(lbs_init_module);
1152 module_exit(lbs_exit_module);
1153 
1154 MODULE_DESCRIPTION("Libertas WLAN Driver Library");
1155 MODULE_AUTHOR("Marvell International Ltd.");
1156 MODULE_LICENSE("GPL");
1157