1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2021 pureLiFi
4  */
5 
6 #include <linux/kernel.h>
7 #include <linux/init.h>
8 #include <linux/device.h>
9 #include <linux/errno.h>
10 #include <linux/slab.h>
11 #include <linux/skbuff.h>
12 #include <linux/usb.h>
13 #include <linux/workqueue.h>
14 #include <linux/proc_fs.h>
15 #include <linux/fs.h>
16 #include <linux/string.h>
17 #include <linux/module.h>
18 #include <net/mac80211.h>
19 #include <asm/unaligned.h>
20 #include <linux/sysfs.h>
21 
22 #include "mac.h"
23 #include "usb.h"
24 #include "chip.h"
25 
26 static const struct usb_device_id usb_ids[] = {
27 	{ USB_DEVICE(PURELIFI_X_VENDOR_ID_0, PURELIFI_X_PRODUCT_ID_0),
28 	  .driver_info = DEVICE_LIFI_X },
29 	{ USB_DEVICE(PURELIFI_XC_VENDOR_ID_0, PURELIFI_XC_PRODUCT_ID_0),
30 	  .driver_info = DEVICE_LIFI_XC },
31 	{ USB_DEVICE(PURELIFI_XL_VENDOR_ID_0, PURELIFI_XL_PRODUCT_ID_0),
32 	  .driver_info = DEVICE_LIFI_XL },
33 	{}
34 };
35 
36 void plfxlc_send_packet_from_data_queue(struct plfxlc_usb *usb)
37 {
38 	struct plfxlc_usb_tx *tx = &usb->tx;
39 	struct sk_buff *skb = NULL;
40 	unsigned long flags;
41 	u8 last_served_sidx;
42 
43 	spin_lock_irqsave(&tx->lock, flags);
44 	last_served_sidx = usb->sidx;
45 	do {
46 		usb->sidx = (usb->sidx + 1) % MAX_STA_NUM;
47 		if (!(tx->station[usb->sidx].flag & STATION_CONNECTED_FLAG))
48 			continue;
49 		if (!(tx->station[usb->sidx].flag & STATION_FIFO_FULL_FLAG))
50 			skb = skb_peek(&tx->station[usb->sidx].data_list);
51 	} while ((usb->sidx != last_served_sidx) && (!skb));
52 
53 	if (skb) {
54 		skb = skb_dequeue(&tx->station[usb->sidx].data_list);
55 		plfxlc_usb_wreq_async(usb, skb->data, skb->len, USB_REQ_DATA_TX,
56 				      plfxlc_tx_urb_complete, skb);
57 		if (skb_queue_len(&tx->station[usb->sidx].data_list) <= 60)
58 			ieee80211_wake_queues(plfxlc_usb_to_hw(usb));
59 	}
60 	spin_unlock_irqrestore(&tx->lock, flags);
61 }
62 
63 static void handle_rx_packet(struct plfxlc_usb *usb, const u8 *buffer,
64 			     unsigned int length)
65 {
66 	plfxlc_mac_rx(plfxlc_usb_to_hw(usb), buffer, length);
67 }
68 
69 static void rx_urb_complete(struct urb *urb)
70 {
71 	struct plfxlc_usb_tx *tx;
72 	struct plfxlc_usb *usb;
73 	unsigned int length;
74 	const u8 *buffer;
75 	u16 status;
76 	u8 sidx;
77 	int r;
78 
79 	if (!urb) {
80 		pr_err("urb is NULL\n");
81 		return;
82 	}
83 	if (!urb->context) {
84 		pr_err("urb ctx is NULL\n");
85 		return;
86 	}
87 	usb = urb->context;
88 
89 	if (usb->initialized != 1) {
90 		pr_err("usb is not initialized\n");
91 		return;
92 	}
93 
94 	tx = &usb->tx;
95 	switch (urb->status) {
96 	case 0:
97 		break;
98 	case -ESHUTDOWN:
99 	case -EINVAL:
100 	case -ENODEV:
101 	case -ENOENT:
102 	case -ECONNRESET:
103 	case -EPIPE:
104 		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
105 		return;
106 	default:
107 		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
108 		if (tx->submitted_urbs++ < PURELIFI_URB_RETRY_MAX) {
109 			dev_dbg(plfxlc_urb_dev(urb), "urb %p resubmit %d", urb,
110 				tx->submitted_urbs++);
111 			goto resubmit;
112 		} else {
113 			dev_dbg(plfxlc_urb_dev(urb), "urb %p  max resubmits reached", urb);
114 			tx->submitted_urbs = 0;
115 			return;
116 		}
117 	}
118 
119 	buffer = urb->transfer_buffer;
120 	length = le32_to_cpu(*(__le32 *)(buffer + sizeof(struct rx_status)))
121 		 + sizeof(u32);
122 
123 	if (urb->actual_length != (PLF_MSG_STATUS_OFFSET + 1)) {
124 		if (usb->initialized && usb->link_up)
125 			handle_rx_packet(usb, buffer, length);
126 		goto resubmit;
127 	}
128 
129 	status = buffer[PLF_MSG_STATUS_OFFSET];
130 
131 	switch (status) {
132 	case STATION_FIFO_ALMOST_FULL_NOT_MESSAGE:
133 		dev_dbg(&usb->intf->dev,
134 			"FIFO full not packet receipt\n");
135 		tx->mac_fifo_full = 1;
136 		for (sidx = 0; sidx < MAX_STA_NUM; sidx++)
137 			tx->station[sidx].flag |= STATION_FIFO_FULL_FLAG;
138 		break;
139 	case STATION_FIFO_ALMOST_FULL_MESSAGE:
140 		dev_dbg(&usb->intf->dev, "FIFO full packet receipt\n");
141 
142 		for (sidx = 0; sidx < MAX_STA_NUM; sidx++)
143 			tx->station[sidx].flag &= STATION_ACTIVE_FLAG;
144 
145 		plfxlc_send_packet_from_data_queue(usb);
146 		break;
147 	case STATION_CONNECT_MESSAGE:
148 		usb->link_up = 1;
149 		dev_dbg(&usb->intf->dev, "ST_CONNECT_MSG packet receipt\n");
150 		break;
151 	case STATION_DISCONNECT_MESSAGE:
152 		usb->link_up = 0;
153 		dev_dbg(&usb->intf->dev, "ST_DISCONN_MSG packet receipt\n");
154 		break;
155 	default:
156 		dev_dbg(&usb->intf->dev, "Unknown packet receipt\n");
157 		break;
158 	}
159 
160 resubmit:
161 	r = usb_submit_urb(urb, GFP_ATOMIC);
162 	if (r)
163 		dev_dbg(plfxlc_urb_dev(urb), "urb %p resubmit fail (%d)\n", urb, r);
164 }
165 
166 static struct urb *alloc_rx_urb(struct plfxlc_usb *usb)
167 {
168 	struct usb_device *udev = plfxlc_usb_to_usbdev(usb);
169 	struct urb *urb;
170 	void *buffer;
171 
172 	urb = usb_alloc_urb(0, GFP_KERNEL);
173 	if (!urb)
174 		return NULL;
175 
176 	buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
177 				    &urb->transfer_dma);
178 	if (!buffer) {
179 		usb_free_urb(urb);
180 		return NULL;
181 	}
182 
183 	usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
184 			  buffer, USB_MAX_RX_SIZE,
185 			  rx_urb_complete, usb);
186 	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
187 
188 	return urb;
189 }
190 
191 static void free_rx_urb(struct urb *urb)
192 {
193 	if (!urb)
194 		return;
195 	usb_free_coherent(urb->dev, urb->transfer_buffer_length,
196 			  urb->transfer_buffer, urb->transfer_dma);
197 	usb_free_urb(urb);
198 }
199 
200 static int __lf_x_usb_enable_rx(struct plfxlc_usb *usb)
201 {
202 	struct plfxlc_usb_rx *rx = &usb->rx;
203 	struct urb **urbs;
204 	int i, r;
205 
206 	r = -ENOMEM;
207 	urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
208 	if (!urbs)
209 		goto error;
210 
211 	for (i = 0; i < RX_URBS_COUNT; i++) {
212 		urbs[i] = alloc_rx_urb(usb);
213 		if (!urbs[i])
214 			goto error;
215 	}
216 
217 	spin_lock_irq(&rx->lock);
218 
219 	dev_dbg(plfxlc_usb_dev(usb), "irq_disabled %d\n", irqs_disabled());
220 
221 	if (rx->urbs) {
222 		spin_unlock_irq(&rx->lock);
223 		r = 0;
224 		goto error;
225 	}
226 	rx->urbs = urbs;
227 	rx->urbs_count = RX_URBS_COUNT;
228 	spin_unlock_irq(&rx->lock);
229 
230 	for (i = 0; i < RX_URBS_COUNT; i++) {
231 		r = usb_submit_urb(urbs[i], GFP_KERNEL);
232 		if (r)
233 			goto error_submit;
234 	}
235 
236 	return 0;
237 
238 error_submit:
239 	for (i = 0; i < RX_URBS_COUNT; i++)
240 		usb_kill_urb(urbs[i]);
241 	spin_lock_irq(&rx->lock);
242 	rx->urbs = NULL;
243 	rx->urbs_count = 0;
244 	spin_unlock_irq(&rx->lock);
245 error:
246 	if (urbs) {
247 		for (i = 0; i < RX_URBS_COUNT; i++)
248 			free_rx_urb(urbs[i]);
249 	}
250 	return r;
251 }
252 
253 int plfxlc_usb_enable_rx(struct plfxlc_usb *usb)
254 {
255 	struct plfxlc_usb_rx *rx = &usb->rx;
256 	int r;
257 
258 	mutex_lock(&rx->setup_mutex);
259 	r = __lf_x_usb_enable_rx(usb);
260 	if (!r)
261 		usb->rx_usb_enabled = 1;
262 
263 	mutex_unlock(&rx->setup_mutex);
264 
265 	return r;
266 }
267 
268 static void __lf_x_usb_disable_rx(struct plfxlc_usb *usb)
269 {
270 	struct plfxlc_usb_rx *rx = &usb->rx;
271 	unsigned long flags;
272 	unsigned int count;
273 	struct urb **urbs;
274 	int i;
275 
276 	spin_lock_irqsave(&rx->lock, flags);
277 	urbs = rx->urbs;
278 	count = rx->urbs_count;
279 	spin_unlock_irqrestore(&rx->lock, flags);
280 
281 	if (!urbs)
282 		return;
283 
284 	for (i = 0; i < count; i++) {
285 		usb_kill_urb(urbs[i]);
286 		free_rx_urb(urbs[i]);
287 	}
288 	kfree(urbs);
289 	rx->urbs = NULL;
290 	rx->urbs_count = 0;
291 }
292 
293 void plfxlc_usb_disable_rx(struct plfxlc_usb *usb)
294 {
295 	struct plfxlc_usb_rx *rx = &usb->rx;
296 
297 	mutex_lock(&rx->setup_mutex);
298 	__lf_x_usb_disable_rx(usb);
299 	usb->rx_usb_enabled = 0;
300 	mutex_unlock(&rx->setup_mutex);
301 }
302 
303 void plfxlc_usb_disable_tx(struct plfxlc_usb *usb)
304 {
305 	struct plfxlc_usb_tx *tx = &usb->tx;
306 	unsigned long flags;
307 
308 	clear_bit(PLF_BIT_ENABLED, &tx->enabled);
309 
310 	/* kill all submitted tx-urbs */
311 	usb_kill_anchored_urbs(&tx->submitted);
312 
313 	spin_lock_irqsave(&tx->lock, flags);
314 	WARN_ON(!skb_queue_empty(&tx->submitted_skbs));
315 	WARN_ON(tx->submitted_urbs != 0);
316 	tx->submitted_urbs = 0;
317 	spin_unlock_irqrestore(&tx->lock, flags);
318 
319 	/* The stopped state is ignored, relying on ieee80211_wake_queues()
320 	 * in a potentionally following plfxlc_usb_enable_tx().
321 	 */
322 }
323 
324 void plfxlc_usb_enable_tx(struct plfxlc_usb *usb)
325 {
326 	struct plfxlc_usb_tx *tx = &usb->tx;
327 	unsigned long flags;
328 
329 	spin_lock_irqsave(&tx->lock, flags);
330 	set_bit(PLF_BIT_ENABLED, &tx->enabled);
331 	tx->submitted_urbs = 0;
332 	ieee80211_wake_queues(plfxlc_usb_to_hw(usb));
333 	tx->stopped = 0;
334 	spin_unlock_irqrestore(&tx->lock, flags);
335 }
336 
337 void plfxlc_tx_urb_complete(struct urb *urb)
338 {
339 	struct ieee80211_tx_info *info;
340 	struct plfxlc_usb *usb;
341 	struct sk_buff *skb;
342 
343 	skb = urb->context;
344 	info = IEEE80211_SKB_CB(skb);
345 	/* grab 'usb' pointer before handing off the skb (since
346 	 * it might be freed by plfxlc_mac_tx_to_dev or mac80211)
347 	 */
348 	usb = &plfxlc_hw_mac(info->rate_driver_data[0])->chip.usb;
349 
350 	switch (urb->status) {
351 	case 0:
352 		break;
353 	case -ESHUTDOWN:
354 	case -EINVAL:
355 	case -ENODEV:
356 	case -ENOENT:
357 	case -ECONNRESET:
358 	case -EPIPE:
359 		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
360 		break;
361 	default:
362 		dev_dbg(plfxlc_urb_dev(urb), "urb %p error %d\n", urb, urb->status);
363 		return;
364 	}
365 
366 	plfxlc_mac_tx_to_dev(skb, urb->status);
367 	plfxlc_send_packet_from_data_queue(usb);
368 	usb_free_urb(urb);
369 }
370 
371 static inline void init_usb_rx(struct plfxlc_usb *usb)
372 {
373 	struct plfxlc_usb_rx *rx = &usb->rx;
374 
375 	spin_lock_init(&rx->lock);
376 	mutex_init(&rx->setup_mutex);
377 
378 	if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH)
379 		rx->usb_packet_size = 512;
380 	else
381 		rx->usb_packet_size = 64;
382 
383 	if (rx->fragment_length != 0)
384 		dev_dbg(plfxlc_usb_dev(usb), "fragment_length error\n");
385 }
386 
387 static inline void init_usb_tx(struct plfxlc_usb *usb)
388 {
389 	struct plfxlc_usb_tx *tx = &usb->tx;
390 
391 	spin_lock_init(&tx->lock);
392 	clear_bit(PLF_BIT_ENABLED, &tx->enabled);
393 	tx->stopped = 0;
394 	skb_queue_head_init(&tx->submitted_skbs);
395 	init_usb_anchor(&tx->submitted);
396 }
397 
398 void plfxlc_usb_init(struct plfxlc_usb *usb, struct ieee80211_hw *hw,
399 		     struct usb_interface *intf)
400 {
401 	memset(usb, 0, sizeof(*usb));
402 	usb->intf = usb_get_intf(intf);
403 	usb_set_intfdata(usb->intf, hw);
404 	init_usb_tx(usb);
405 	init_usb_rx(usb);
406 }
407 
408 void plfxlc_usb_release(struct plfxlc_usb *usb)
409 {
410 	plfxlc_op_stop(plfxlc_usb_to_hw(usb));
411 	plfxlc_usb_disable_tx(usb);
412 	plfxlc_usb_disable_rx(usb);
413 	usb_set_intfdata(usb->intf, NULL);
414 	usb_put_intf(usb->intf);
415 }
416 
417 const char *plfxlc_speed(enum usb_device_speed speed)
418 {
419 	switch (speed) {
420 	case USB_SPEED_LOW:
421 		return "low";
422 	case USB_SPEED_FULL:
423 		return "full";
424 	case USB_SPEED_HIGH:
425 		return "high";
426 	default:
427 		return "unknown";
428 	}
429 }
430 
431 int plfxlc_usb_init_hw(struct plfxlc_usb *usb)
432 {
433 	int r;
434 
435 	r = usb_reset_configuration(plfxlc_usb_to_usbdev(usb));
436 	if (r) {
437 		dev_err(plfxlc_usb_dev(usb), "cfg reset failed (%d)\n", r);
438 		return r;
439 	}
440 	return 0;
441 }
442 
443 static void get_usb_req(struct usb_device *udev, void *buffer,
444 			u32 buffer_len, enum plf_usb_req_enum usb_req_id,
445 			struct plf_usb_req *usb_req)
446 {
447 	__be32 payload_len_nw = cpu_to_be32(buffer_len + FCS_LEN);
448 	const u8 *buffer_src_p = buffer;
449 	u8 *buffer_dst = usb_req->buf;
450 	u32 temp_usb_len = 0;
451 
452 	usb_req->id = cpu_to_be32(usb_req_id);
453 	usb_req->len  = cpu_to_be32(0);
454 
455 	/* Copy buffer length into the transmitted buffer, as it is important
456 	 * for the Rx MAC to know its exact length.
457 	 */
458 	if (usb_req->id == cpu_to_be32(USB_REQ_BEACON_WR)) {
459 		memcpy(buffer_dst, &payload_len_nw, sizeof(payload_len_nw));
460 		buffer_dst += sizeof(payload_len_nw);
461 		temp_usb_len += sizeof(payload_len_nw);
462 	}
463 
464 	memcpy(buffer_dst, buffer_src_p, buffer_len);
465 	buffer_dst += buffer_len;
466 	buffer_src_p += buffer_len;
467 	temp_usb_len +=  buffer_len;
468 
469 	/* Set the FCS_LEN (4) bytes as 0 for CRC checking. */
470 	memset(buffer_dst, 0, FCS_LEN);
471 	buffer_dst += FCS_LEN;
472 	temp_usb_len += FCS_LEN;
473 
474 	/* Round the packet to be transmitted to 4 bytes. */
475 	if (temp_usb_len % PURELIFI_BYTE_NUM_ALIGNMENT) {
476 		memset(buffer_dst, 0, PURELIFI_BYTE_NUM_ALIGNMENT -
477 		       (temp_usb_len %
478 			PURELIFI_BYTE_NUM_ALIGNMENT));
479 		buffer_dst += PURELIFI_BYTE_NUM_ALIGNMENT -
480 				(temp_usb_len %
481 				PURELIFI_BYTE_NUM_ALIGNMENT);
482 		temp_usb_len += PURELIFI_BYTE_NUM_ALIGNMENT -
483 				(temp_usb_len % PURELIFI_BYTE_NUM_ALIGNMENT);
484 	}
485 
486 	usb_req->len = cpu_to_be32(temp_usb_len);
487 }
488 
489 int plfxlc_usb_wreq_async(struct plfxlc_usb *usb, const u8 *buffer,
490 			  int buffer_len, enum plf_usb_req_enum usb_req_id,
491 			  usb_complete_t complete_fn,
492 			  void *context)
493 {
494 	struct usb_device *udev = interface_to_usbdev(usb->ez_usb);
495 	struct urb *urb = usb_alloc_urb(0, GFP_ATOMIC);
496 	int r;
497 
498 	usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
499 			  (void *)buffer, buffer_len, complete_fn, context);
500 
501 	r = usb_submit_urb(urb, GFP_ATOMIC);
502 	if (r)
503 		dev_err(&udev->dev, "Async write submit failed (%d)\n", r);
504 
505 	return r;
506 }
507 
508 int plfxlc_usb_wreq(struct usb_interface *ez_usb, void *buffer, int buffer_len,
509 		    enum plf_usb_req_enum usb_req_id)
510 {
511 	struct usb_device *udev = interface_to_usbdev(ez_usb);
512 	unsigned char *dma_buffer = NULL;
513 	struct plf_usb_req usb_req;
514 	int usb_bulk_msg_len;
515 	int actual_length;
516 	int r;
517 
518 	get_usb_req(udev, buffer, buffer_len, usb_req_id, &usb_req);
519 	usb_bulk_msg_len = sizeof(__le32) + sizeof(__le32) +
520 			   be32_to_cpu(usb_req.len);
521 
522 	dma_buffer = kmemdup(&usb_req, usb_bulk_msg_len, GFP_KERNEL);
523 
524 	if (!dma_buffer) {
525 		r = -ENOMEM;
526 		goto error;
527 	}
528 
529 	r = usb_bulk_msg(udev,
530 			 usb_sndbulkpipe(udev, EP_DATA_OUT),
531 			 dma_buffer, usb_bulk_msg_len,
532 			 &actual_length, USB_BULK_MSG_TIMEOUT_MS);
533 	kfree(dma_buffer);
534 error:
535 	if (r) {
536 		r = -ENOMEM;
537 		dev_err(&udev->dev, "usb_bulk_msg failed (%d)\n", r);
538 	}
539 
540 	return r;
541 }
542 
543 static void slif_data_plane_sap_timer_callb(struct timer_list *t)
544 {
545 	struct plfxlc_usb *usb = from_timer(usb, t, tx.tx_retry_timer);
546 
547 	plfxlc_send_packet_from_data_queue(usb);
548 	timer_setup(&usb->tx.tx_retry_timer,
549 		    slif_data_plane_sap_timer_callb, 0);
550 	mod_timer(&usb->tx.tx_retry_timer, jiffies + TX_RETRY_BACKOFF_JIFF);
551 }
552 
553 static void sta_queue_cleanup_timer_callb(struct timer_list *t)
554 {
555 	struct plfxlc_usb *usb = from_timer(usb, t, sta_queue_cleanup);
556 	struct plfxlc_usb_tx *tx = &usb->tx;
557 	int sidx;
558 
559 	for (sidx = 0; sidx < MAX_STA_NUM - 1; sidx++) {
560 		if (!(tx->station[sidx].flag & STATION_CONNECTED_FLAG))
561 			continue;
562 		if (tx->station[sidx].flag & STATION_HEARTBEAT_FLAG) {
563 			tx->station[sidx].flag ^= STATION_HEARTBEAT_FLAG;
564 		} else {
565 			eth_zero_addr(tx->station[sidx].mac);
566 			tx->station[sidx].flag = 0;
567 		}
568 	}
569 	timer_setup(&usb->sta_queue_cleanup,
570 		    sta_queue_cleanup_timer_callb, 0);
571 	mod_timer(&usb->sta_queue_cleanup, jiffies + STA_QUEUE_CLEANUP_JIFF);
572 }
573 
574 static int probe(struct usb_interface *intf,
575 		 const struct usb_device_id *id)
576 {
577 	u8 serial_number[PURELIFI_SERIAL_LEN];
578 	struct ieee80211_hw *hw = NULL;
579 	struct plfxlc_usb_tx *tx;
580 	struct plfxlc_chip *chip;
581 	struct plfxlc_usb *usb;
582 	u8 hw_address[ETH_ALEN];
583 	unsigned int i;
584 	int r = 0;
585 
586 	hw = plfxlc_mac_alloc_hw(intf);
587 
588 	if (!hw) {
589 		r = -ENOMEM;
590 		goto error;
591 	}
592 
593 	chip = &plfxlc_hw_mac(hw)->chip;
594 	usb = &chip->usb;
595 	usb->ez_usb = intf;
596 	tx = &usb->tx;
597 
598 	r = plfxlc_upload_mac_and_serial(intf, hw_address, serial_number);
599 	if (r) {
600 		dev_err(&intf->dev, "MAC and Serial upload failed (%d)\n", r);
601 		goto error;
602 	}
603 
604 	chip->unit_type = STA;
605 	dev_err(&intf->dev, "Unit type is station");
606 
607 	r = plfxlc_mac_preinit_hw(hw, hw_address);
608 	if (r) {
609 		dev_err(&intf->dev, "Init mac failed (%d)\n", r);
610 		goto error;
611 	}
612 
613 	r = ieee80211_register_hw(hw);
614 	if (r) {
615 		dev_err(&intf->dev, "Register device failed (%d)\n", r);
616 		goto error;
617 	}
618 
619 	if ((le16_to_cpu(interface_to_usbdev(intf)->descriptor.idVendor) ==
620 				PURELIFI_XL_VENDOR_ID_0) &&
621 	    (le16_to_cpu(interface_to_usbdev(intf)->descriptor.idProduct) ==
622 				PURELIFI_XL_PRODUCT_ID_0)) {
623 		r = plfxlc_download_xl_firmware(intf);
624 	} else {
625 		r = plfxlc_download_fpga(intf);
626 	}
627 	if (r != 0) {
628 		dev_err(&intf->dev, "FPGA download failed (%d)\n", r);
629 		goto error;
630 	}
631 
632 	tx->mac_fifo_full = 0;
633 	spin_lock_init(&tx->lock);
634 
635 	msleep(PLF_MSLEEP_TIME);
636 	r = plfxlc_usb_init_hw(usb);
637 	if (r < 0) {
638 		dev_err(&intf->dev, "usb_init_hw failed (%d)\n", r);
639 		goto error;
640 	}
641 
642 	msleep(PLF_MSLEEP_TIME);
643 	r = plfxlc_chip_switch_radio(chip, PLFXLC_RADIO_ON);
644 	if (r < 0) {
645 		dev_dbg(&intf->dev, "chip_switch_radio_on failed (%d)\n", r);
646 		goto error;
647 	}
648 
649 	msleep(PLF_MSLEEP_TIME);
650 	r = plfxlc_chip_set_rate(chip, 8);
651 	if (r < 0) {
652 		dev_dbg(&intf->dev, "chip_set_rate failed (%d)\n", r);
653 		goto error;
654 	}
655 
656 	msleep(PLF_MSLEEP_TIME);
657 	r = plfxlc_usb_wreq(usb->ez_usb,
658 			    hw_address, ETH_ALEN, USB_REQ_MAC_WR);
659 	if (r < 0) {
660 		dev_dbg(&intf->dev, "MAC_WR failure (%d)\n", r);
661 		goto error;
662 	}
663 
664 	plfxlc_chip_enable_rxtx(chip);
665 
666 	/* Initialise the data plane Tx queue */
667 	for (i = 0; i < MAX_STA_NUM; i++) {
668 		skb_queue_head_init(&tx->station[i].data_list);
669 		tx->station[i].flag = 0;
670 	}
671 
672 	tx->station[STA_BROADCAST_INDEX].flag |= STATION_CONNECTED_FLAG;
673 	for (i = 0; i < ETH_ALEN; i++)
674 		tx->station[STA_BROADCAST_INDEX].mac[i] = 0xFF;
675 
676 	timer_setup(&tx->tx_retry_timer, slif_data_plane_sap_timer_callb, 0);
677 	tx->tx_retry_timer.expires = jiffies + TX_RETRY_BACKOFF_JIFF;
678 	add_timer(&tx->tx_retry_timer);
679 
680 	timer_setup(&usb->sta_queue_cleanup,
681 		    sta_queue_cleanup_timer_callb, 0);
682 	usb->sta_queue_cleanup.expires = jiffies + STA_QUEUE_CLEANUP_JIFF;
683 	add_timer(&usb->sta_queue_cleanup);
684 
685 	plfxlc_mac_init_hw(hw);
686 	usb->initialized = true;
687 	return 0;
688 error:
689 	if (hw) {
690 		plfxlc_mac_release(plfxlc_hw_mac(hw));
691 		ieee80211_unregister_hw(hw);
692 		ieee80211_free_hw(hw);
693 	}
694 	dev_err(&intf->dev, "pureLifi:Device error");
695 	return r;
696 }
697 
698 static void disconnect(struct usb_interface *intf)
699 {
700 	struct ieee80211_hw *hw = plfxlc_intf_to_hw(intf);
701 	struct plfxlc_mac *mac;
702 	struct plfxlc_usb *usb;
703 
704 	/* Either something really bad happened, or
705 	 * we're just dealing with a DEVICE_INSTALLER.
706 	 */
707 	if (!hw)
708 		return;
709 
710 	mac = plfxlc_hw_mac(hw);
711 	usb = &mac->chip.usb;
712 
713 	del_timer_sync(&usb->tx.tx_retry_timer);
714 	del_timer_sync(&usb->sta_queue_cleanup);
715 
716 	ieee80211_unregister_hw(hw);
717 
718 	plfxlc_chip_disable_rxtx(&mac->chip);
719 
720 	/* If the disconnect has been caused by a removal of the
721 	 * driver module, the reset allows reloading of the driver. If the
722 	 * reset will not be executed here, the upload of the firmware in the
723 	 * probe function caused by the reloading of the driver will fail.
724 	 */
725 	usb_reset_device(interface_to_usbdev(intf));
726 
727 	plfxlc_mac_release(mac);
728 	ieee80211_free_hw(hw);
729 }
730 
731 static void plfxlc_usb_resume(struct plfxlc_usb *usb)
732 {
733 	struct plfxlc_mac *mac = plfxlc_usb_to_mac(usb);
734 	int r;
735 
736 	r = plfxlc_op_start(plfxlc_usb_to_hw(usb));
737 	if (r < 0) {
738 		dev_warn(plfxlc_usb_dev(usb),
739 			 "Device resume failed (%d)\n", r);
740 
741 		if (usb->was_running)
742 			set_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);
743 
744 		usb_queue_reset_device(usb->intf);
745 		return;
746 	}
747 
748 	if (mac->type != NL80211_IFTYPE_UNSPECIFIED) {
749 		r = plfxlc_restore_settings(mac);
750 		if (r < 0) {
751 			dev_dbg(plfxlc_usb_dev(usb),
752 				"Restore failed (%d)\n", r);
753 			return;
754 		}
755 	}
756 }
757 
758 static void plfxlc_usb_stop(struct plfxlc_usb *usb)
759 {
760 	plfxlc_op_stop(plfxlc_usb_to_hw(usb));
761 	plfxlc_usb_disable_tx(usb);
762 	plfxlc_usb_disable_rx(usb);
763 
764 	usb->initialized = false;
765 }
766 
767 static int pre_reset(struct usb_interface *intf)
768 {
769 	struct ieee80211_hw *hw = usb_get_intfdata(intf);
770 	struct plfxlc_mac *mac;
771 	struct plfxlc_usb *usb;
772 
773 	if (!hw || intf->condition != USB_INTERFACE_BOUND)
774 		return 0;
775 
776 	mac = plfxlc_hw_mac(hw);
777 	usb = &mac->chip.usb;
778 
779 	usb->was_running = test_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);
780 
781 	plfxlc_usb_stop(usb);
782 
783 	return 0;
784 }
785 
786 static int post_reset(struct usb_interface *intf)
787 {
788 	struct ieee80211_hw *hw = usb_get_intfdata(intf);
789 	struct plfxlc_mac *mac;
790 	struct plfxlc_usb *usb;
791 
792 	if (!hw || intf->condition != USB_INTERFACE_BOUND)
793 		return 0;
794 
795 	mac = plfxlc_hw_mac(hw);
796 	usb = &mac->chip.usb;
797 
798 	if (usb->was_running)
799 		plfxlc_usb_resume(usb);
800 
801 	return 0;
802 }
803 
804 #ifdef CONFIG_PM
805 
806 static struct plfxlc_usb *get_plfxlc_usb(struct usb_interface *intf)
807 {
808 	struct ieee80211_hw *hw = plfxlc_intf_to_hw(intf);
809 	struct plfxlc_mac *mac;
810 
811 	/* Either something really bad happened, or
812 	 * we're just dealing with a DEVICE_INSTALLER.
813 	 */
814 	if (!hw)
815 		return NULL;
816 
817 	mac = plfxlc_hw_mac(hw);
818 	return &mac->chip.usb;
819 }
820 
821 static int suspend(struct usb_interface *interface,
822 		   pm_message_t message)
823 {
824 	struct plfxlc_usb *pl = get_plfxlc_usb(interface);
825 	struct plfxlc_mac *mac = plfxlc_usb_to_mac(pl);
826 
827 	if (!pl)
828 		return -ENODEV;
829 	if (pl->initialized == 0)
830 		return 0;
831 	pl->was_running = test_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);
832 	plfxlc_usb_stop(pl);
833 	return 0;
834 }
835 
836 static int resume(struct usb_interface *interface)
837 {
838 	struct plfxlc_usb *pl = get_plfxlc_usb(interface);
839 
840 	if (!pl)
841 		return -ENODEV;
842 	if (pl->was_running)
843 		plfxlc_usb_resume(pl);
844 	return 0;
845 }
846 
847 #endif
848 
849 static struct usb_driver driver = {
850 	.name = KBUILD_MODNAME,
851 	.id_table = usb_ids,
852 	.probe = probe,
853 	.disconnect = disconnect,
854 	.pre_reset = pre_reset,
855 	.post_reset = post_reset,
856 #ifdef CONFIG_PM
857 	.suspend = suspend,
858 	.resume = resume,
859 #endif
860 	.disable_hub_initiated_lpm = 1,
861 };
862 
863 static int __init usb_init(void)
864 {
865 	int r;
866 
867 	r = usb_register(&driver);
868 	if (r) {
869 		pr_err("%s usb_register() failed %d\n", driver.name, r);
870 		return r;
871 	}
872 
873 	pr_debug("Driver initialized :%s\n", driver.name);
874 	return 0;
875 }
876 
877 static void __exit usb_exit(void)
878 {
879 	usb_deregister(&driver);
880 	pr_debug("%s %s\n", driver.name, __func__);
881 }
882 
883 MODULE_LICENSE("GPL");
884 MODULE_DESCRIPTION("USB driver for pureLiFi devices");
885 MODULE_AUTHOR("pureLiFi");
886 MODULE_VERSION("1.0");
887 MODULE_FIRMWARE("plfxlc/lifi-x.bin");
888 MODULE_DEVICE_TABLE(usb, usb_ids);
889 
890 module_init(usb_init);
891 module_exit(usb_exit);
892