xref: /linux/drivers/mfd/dln2.c (revision 5cd2340cb6a383d04fd88e48fabc2a21a909d6a1)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Driver for the Diolan DLN-2 USB adapter
4  *
5  * Copyright (c) 2014 Intel Corporation
6  *
7  * Derived from:
8  *  i2c-diolan-u2c.c
9  *  Copyright (c) 2010-2011 Ericsson AB
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/usb.h>
17 #include <linux/mutex.h>
18 #include <linux/platform_device.h>
19 #include <linux/mfd/core.h>
20 #include <linux/mfd/dln2.h>
21 #include <linux/rculist.h>
22 
23 struct dln2_header {
24 	__le16 size;
25 	__le16 id;
26 	__le16 echo;
27 	__le16 handle;
28 };
29 
30 struct dln2_response {
31 	struct dln2_header hdr;
32 	__le16 result;
33 };
34 
35 #define DLN2_GENERIC_MODULE_ID		0x00
36 #define DLN2_GENERIC_CMD(cmd)		DLN2_CMD(cmd, DLN2_GENERIC_MODULE_ID)
37 #define CMD_GET_DEVICE_VER		DLN2_GENERIC_CMD(0x30)
38 #define CMD_GET_DEVICE_SN		DLN2_GENERIC_CMD(0x31)
39 
40 #define DLN2_HW_ID			0x200
41 #define DLN2_USB_TIMEOUT		200	/* in ms */
42 #define DLN2_MAX_RX_SLOTS		16
43 #define DLN2_MAX_URBS			16
44 #define DLN2_RX_BUF_SIZE		512
45 
46 enum dln2_handle {
47 	DLN2_HANDLE_EVENT = 0,		/* don't change, hardware defined */
48 	DLN2_HANDLE_CTRL,
49 	DLN2_HANDLE_GPIO,
50 	DLN2_HANDLE_I2C,
51 	DLN2_HANDLE_SPI,
52 	DLN2_HANDLE_ADC,
53 	DLN2_HANDLES
54 };
55 
56 /*
57  * Receive context used between the receive demultiplexer and the transfer
58  * routine. While sending a request the transfer routine will look for a free
59  * receive context and use it to wait for a response and to receive the URB and
60  * thus the response data.
61  */
62 struct dln2_rx_context {
63 	/* completion used to wait for a response */
64 	struct completion done;
65 
66 	/* if non-NULL the URB contains the response */
67 	struct urb *urb;
68 
69 	/* if true then this context is used to wait for a response */
70 	bool in_use;
71 };
72 
73 /*
74  * Receive contexts for a particular DLN2 module (i2c, gpio, etc.). We use the
75  * handle header field to identify the module in dln2_dev.mod_rx_slots and then
76  * the echo header field to index the slots field and find the receive context
77  * for a particular request.
78  */
79 struct dln2_mod_rx_slots {
80 	/* RX slots bitmap */
81 	DECLARE_BITMAP(bmap, DLN2_MAX_RX_SLOTS);
82 
83 	/* used to wait for a free RX slot */
84 	wait_queue_head_t wq;
85 
86 	/* used to wait for an RX operation to complete */
87 	struct dln2_rx_context slots[DLN2_MAX_RX_SLOTS];
88 
89 	/* avoid races between alloc/free_rx_slot and dln2_rx_transfer */
90 	spinlock_t lock;
91 };
92 
93 struct dln2_dev {
94 	struct usb_device *usb_dev;
95 	struct usb_interface *interface;
96 	u8 ep_in;
97 	u8 ep_out;
98 
99 	struct urb *rx_urb[DLN2_MAX_URBS];
100 	void *rx_buf[DLN2_MAX_URBS];
101 
102 	struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES];
103 
104 	struct list_head event_cb_list;
105 	spinlock_t event_cb_lock;
106 
107 	bool disconnect;
108 	int active_transfers;
109 	wait_queue_head_t disconnect_wq;
110 	spinlock_t disconnect_lock;
111 };
112 
113 struct dln2_event_cb_entry {
114 	struct list_head list;
115 	u16 id;
116 	struct platform_device *pdev;
117 	dln2_event_cb_t callback;
118 };
119 
120 int dln2_register_event_cb(struct platform_device *pdev, u16 id,
121 			   dln2_event_cb_t event_cb)
122 {
123 	struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent);
124 	struct dln2_event_cb_entry *i, *entry;
125 	unsigned long flags;
126 	int ret = 0;
127 
128 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
129 	if (!entry)
130 		return -ENOMEM;
131 
132 	entry->id = id;
133 	entry->callback = event_cb;
134 	entry->pdev = pdev;
135 
136 	spin_lock_irqsave(&dln2->event_cb_lock, flags);
137 
138 	list_for_each_entry(i, &dln2->event_cb_list, list) {
139 		if (i->id == id) {
140 			ret = -EBUSY;
141 			break;
142 		}
143 	}
144 
145 	if (!ret)
146 		list_add_rcu(&entry->list, &dln2->event_cb_list);
147 
148 	spin_unlock_irqrestore(&dln2->event_cb_lock, flags);
149 
150 	if (ret)
151 		kfree(entry);
152 
153 	return ret;
154 }
155 EXPORT_SYMBOL(dln2_register_event_cb);
156 
157 void dln2_unregister_event_cb(struct platform_device *pdev, u16 id)
158 {
159 	struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent);
160 	struct dln2_event_cb_entry *i;
161 	unsigned long flags;
162 	bool found = false;
163 
164 	spin_lock_irqsave(&dln2->event_cb_lock, flags);
165 
166 	list_for_each_entry(i, &dln2->event_cb_list, list) {
167 		if (i->id == id) {
168 			list_del_rcu(&i->list);
169 			found = true;
170 			break;
171 		}
172 	}
173 
174 	spin_unlock_irqrestore(&dln2->event_cb_lock, flags);
175 
176 	if (found) {
177 		synchronize_rcu();
178 		kfree(i);
179 	}
180 }
181 EXPORT_SYMBOL(dln2_unregister_event_cb);
182 
183 /*
184  * Returns true if a valid transfer slot is found. In this case the URB must not
185  * be resubmitted immediately in dln2_rx as we need the data when dln2_transfer
186  * is woke up. It will be resubmitted there.
187  */
188 static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb,
189 				   u16 handle, u16 rx_slot)
190 {
191 	struct device *dev = &dln2->interface->dev;
192 	struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle];
193 	struct dln2_rx_context *rxc;
194 	unsigned long flags;
195 	bool valid_slot = false;
196 
197 	if (rx_slot >= DLN2_MAX_RX_SLOTS)
198 		goto out;
199 
200 	rxc = &rxs->slots[rx_slot];
201 
202 	spin_lock_irqsave(&rxs->lock, flags);
203 	if (rxc->in_use && !rxc->urb) {
204 		rxc->urb = urb;
205 		complete(&rxc->done);
206 		valid_slot = true;
207 	}
208 	spin_unlock_irqrestore(&rxs->lock, flags);
209 
210 out:
211 	if (!valid_slot)
212 		dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot);
213 
214 	return valid_slot;
215 }
216 
217 static void dln2_run_event_callbacks(struct dln2_dev *dln2, u16 id, u16 echo,
218 				     void *data, int len)
219 {
220 	struct dln2_event_cb_entry *i;
221 
222 	rcu_read_lock();
223 
224 	list_for_each_entry_rcu(i, &dln2->event_cb_list, list) {
225 		if (i->id == id) {
226 			i->callback(i->pdev, echo, data, len);
227 			break;
228 		}
229 	}
230 
231 	rcu_read_unlock();
232 }
233 
234 static void dln2_rx(struct urb *urb)
235 {
236 	struct dln2_dev *dln2 = urb->context;
237 	struct dln2_header *hdr = urb->transfer_buffer;
238 	struct device *dev = &dln2->interface->dev;
239 	u16 id, echo, handle, size;
240 	u8 *data;
241 	int len;
242 	int err;
243 
244 	switch (urb->status) {
245 	case 0:
246 		/* success */
247 		break;
248 	case -ECONNRESET:
249 	case -ENOENT:
250 	case -ESHUTDOWN:
251 	case -EPIPE:
252 		/* this urb is terminated, clean up */
253 		dev_dbg(dev, "urb shutting down with status %d\n", urb->status);
254 		return;
255 	default:
256 		dev_dbg(dev, "nonzero urb status received %d\n", urb->status);
257 		goto out;
258 	}
259 
260 	if (urb->actual_length < sizeof(struct dln2_header)) {
261 		dev_err(dev, "short response: %d\n", urb->actual_length);
262 		goto out;
263 	}
264 
265 	handle = le16_to_cpu(hdr->handle);
266 	id = le16_to_cpu(hdr->id);
267 	echo = le16_to_cpu(hdr->echo);
268 	size = le16_to_cpu(hdr->size);
269 
270 	if (size != urb->actual_length) {
271 		dev_err(dev, "size mismatch: handle %x cmd %x echo %x size %d actual %d\n",
272 			handle, id, echo, size, urb->actual_length);
273 		goto out;
274 	}
275 
276 	if (handle >= DLN2_HANDLES) {
277 		dev_warn(dev, "invalid handle %d\n", handle);
278 		goto out;
279 	}
280 
281 	data = urb->transfer_buffer + sizeof(struct dln2_header);
282 	len = urb->actual_length - sizeof(struct dln2_header);
283 
284 	if (handle == DLN2_HANDLE_EVENT) {
285 		unsigned long flags;
286 
287 		spin_lock_irqsave(&dln2->event_cb_lock, flags);
288 		dln2_run_event_callbacks(dln2, id, echo, data, len);
289 		spin_unlock_irqrestore(&dln2->event_cb_lock, flags);
290 	} else {
291 		/* URB will be re-submitted in _dln2_transfer (free_rx_slot) */
292 		if (dln2_transfer_complete(dln2, urb, handle, echo))
293 			return;
294 	}
295 
296 out:
297 	err = usb_submit_urb(urb, GFP_ATOMIC);
298 	if (err < 0)
299 		dev_err(dev, "failed to resubmit RX URB: %d\n", err);
300 }
301 
302 static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf,
303 			   int *obuf_len, gfp_t gfp)
304 {
305 	int len;
306 	void *buf;
307 	struct dln2_header *hdr;
308 
309 	len = *obuf_len + sizeof(*hdr);
310 	buf = kmalloc(len, gfp);
311 	if (!buf)
312 		return NULL;
313 
314 	hdr = (struct dln2_header *)buf;
315 	hdr->id = cpu_to_le16(cmd);
316 	hdr->size = cpu_to_le16(len);
317 	hdr->echo = cpu_to_le16(echo);
318 	hdr->handle = cpu_to_le16(handle);
319 
320 	memcpy(buf + sizeof(*hdr), obuf, *obuf_len);
321 
322 	*obuf_len = len;
323 
324 	return buf;
325 }
326 
327 static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo,
328 			  const void *obuf, int obuf_len)
329 {
330 	int ret = 0;
331 	int len = obuf_len;
332 	void *buf;
333 	int actual;
334 
335 	buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL);
336 	if (!buf)
337 		return -ENOMEM;
338 
339 	ret = usb_bulk_msg(dln2->usb_dev,
340 			   usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out),
341 			   buf, len, &actual, DLN2_USB_TIMEOUT);
342 
343 	kfree(buf);
344 
345 	return ret;
346 }
347 
348 static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot)
349 {
350 	struct dln2_mod_rx_slots *rxs;
351 	unsigned long flags;
352 
353 	if (dln2->disconnect) {
354 		*slot = -ENODEV;
355 		return true;
356 	}
357 
358 	rxs = &dln2->mod_rx_slots[handle];
359 
360 	spin_lock_irqsave(&rxs->lock, flags);
361 
362 	*slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS);
363 
364 	if (*slot < DLN2_MAX_RX_SLOTS) {
365 		struct dln2_rx_context *rxc = &rxs->slots[*slot];
366 
367 		set_bit(*slot, rxs->bmap);
368 		rxc->in_use = true;
369 	}
370 
371 	spin_unlock_irqrestore(&rxs->lock, flags);
372 
373 	return *slot < DLN2_MAX_RX_SLOTS;
374 }
375 
376 static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle)
377 {
378 	int ret;
379 	int slot;
380 
381 	/*
382 	 * No need to timeout here, the wait is bounded by the timeout in
383 	 * _dln2_transfer.
384 	 */
385 	ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq,
386 				       find_free_slot(dln2, handle, &slot));
387 	if (ret < 0)
388 		return ret;
389 
390 	return slot;
391 }
392 
393 static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot)
394 {
395 	struct dln2_mod_rx_slots *rxs;
396 	struct urb *urb = NULL;
397 	unsigned long flags;
398 	struct dln2_rx_context *rxc;
399 
400 	rxs = &dln2->mod_rx_slots[handle];
401 
402 	spin_lock_irqsave(&rxs->lock, flags);
403 
404 	clear_bit(slot, rxs->bmap);
405 
406 	rxc = &rxs->slots[slot];
407 	rxc->in_use = false;
408 	urb = rxc->urb;
409 	rxc->urb = NULL;
410 	reinit_completion(&rxc->done);
411 
412 	spin_unlock_irqrestore(&rxs->lock, flags);
413 
414 	if (urb) {
415 		int err;
416 		struct device *dev = &dln2->interface->dev;
417 
418 		err = usb_submit_urb(urb, GFP_KERNEL);
419 		if (err < 0)
420 			dev_err(dev, "failed to resubmit RX URB: %d\n", err);
421 	}
422 
423 	wake_up_interruptible(&rxs->wq);
424 }
425 
426 static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd,
427 			  const void *obuf, unsigned obuf_len,
428 			  void *ibuf, unsigned *ibuf_len)
429 {
430 	int ret = 0;
431 	int rx_slot;
432 	struct dln2_response *rsp;
433 	struct dln2_rx_context *rxc;
434 	struct device *dev = &dln2->interface->dev;
435 	const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT);
436 	struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle];
437 	int size;
438 
439 	spin_lock(&dln2->disconnect_lock);
440 	if (!dln2->disconnect)
441 		dln2->active_transfers++;
442 	else
443 		ret = -ENODEV;
444 	spin_unlock(&dln2->disconnect_lock);
445 
446 	if (ret)
447 		return ret;
448 
449 	rx_slot = alloc_rx_slot(dln2, handle);
450 	if (rx_slot < 0) {
451 		ret = rx_slot;
452 		goto out_decr;
453 	}
454 
455 	ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len);
456 	if (ret < 0) {
457 		dev_err(dev, "USB write failed: %d\n", ret);
458 		goto out_free_rx_slot;
459 	}
460 
461 	rxc = &rxs->slots[rx_slot];
462 
463 	ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout);
464 	if (ret <= 0) {
465 		if (!ret)
466 			ret = -ETIMEDOUT;
467 		goto out_free_rx_slot;
468 	} else {
469 		ret = 0;
470 	}
471 
472 	if (dln2->disconnect) {
473 		ret = -ENODEV;
474 		goto out_free_rx_slot;
475 	}
476 
477 	/* if we got here we know that the response header has been checked */
478 	rsp = rxc->urb->transfer_buffer;
479 	size = le16_to_cpu(rsp->hdr.size);
480 
481 	if (size < sizeof(*rsp)) {
482 		ret = -EPROTO;
483 		goto out_free_rx_slot;
484 	}
485 
486 	if (le16_to_cpu(rsp->result) > 0x80) {
487 		dev_dbg(dev, "%d received response with error %d\n",
488 			handle, le16_to_cpu(rsp->result));
489 		ret = -EREMOTEIO;
490 		goto out_free_rx_slot;
491 	}
492 
493 	if (!ibuf)
494 		goto out_free_rx_slot;
495 
496 	if (*ibuf_len > size - sizeof(*rsp))
497 		*ibuf_len = size - sizeof(*rsp);
498 
499 	memcpy(ibuf, rsp + 1, *ibuf_len);
500 
501 out_free_rx_slot:
502 	free_rx_slot(dln2, handle, rx_slot);
503 out_decr:
504 	spin_lock(&dln2->disconnect_lock);
505 	dln2->active_transfers--;
506 	spin_unlock(&dln2->disconnect_lock);
507 	if (dln2->disconnect)
508 		wake_up(&dln2->disconnect_wq);
509 
510 	return ret;
511 }
512 
513 int dln2_transfer(struct platform_device *pdev, u16 cmd,
514 		  const void *obuf, unsigned obuf_len,
515 		  void *ibuf, unsigned *ibuf_len)
516 {
517 	struct dln2_platform_data *dln2_pdata;
518 	struct dln2_dev *dln2;
519 	u16 handle;
520 
521 	dln2 = dev_get_drvdata(pdev->dev.parent);
522 	dln2_pdata = dev_get_platdata(&pdev->dev);
523 	handle = dln2_pdata->handle;
524 
525 	return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf,
526 			      ibuf_len);
527 }
528 EXPORT_SYMBOL(dln2_transfer);
529 
530 static int dln2_check_hw(struct dln2_dev *dln2)
531 {
532 	int ret;
533 	__le32 hw_type;
534 	int len = sizeof(hw_type);
535 
536 	ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER,
537 			     NULL, 0, &hw_type, &len);
538 	if (ret < 0)
539 		return ret;
540 	if (len < sizeof(hw_type))
541 		return -EREMOTEIO;
542 
543 	if (le32_to_cpu(hw_type) != DLN2_HW_ID) {
544 		dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n",
545 			le32_to_cpu(hw_type));
546 		return -ENODEV;
547 	}
548 
549 	return 0;
550 }
551 
552 static int dln2_print_serialno(struct dln2_dev *dln2)
553 {
554 	int ret;
555 	__le32 serial_no;
556 	int len = sizeof(serial_no);
557 	struct device *dev = &dln2->interface->dev;
558 
559 	ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0,
560 			     &serial_no, &len);
561 	if (ret < 0)
562 		return ret;
563 	if (len < sizeof(serial_no))
564 		return -EREMOTEIO;
565 
566 	dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no));
567 
568 	return 0;
569 }
570 
571 static int dln2_hw_init(struct dln2_dev *dln2)
572 {
573 	int ret;
574 
575 	ret = dln2_check_hw(dln2);
576 	if (ret < 0)
577 		return ret;
578 
579 	return dln2_print_serialno(dln2);
580 }
581 
582 static void dln2_free_rx_urbs(struct dln2_dev *dln2)
583 {
584 	int i;
585 
586 	for (i = 0; i < DLN2_MAX_URBS; i++) {
587 		usb_free_urb(dln2->rx_urb[i]);
588 		kfree(dln2->rx_buf[i]);
589 	}
590 }
591 
592 static void dln2_stop_rx_urbs(struct dln2_dev *dln2)
593 {
594 	int i;
595 
596 	for (i = 0; i < DLN2_MAX_URBS; i++)
597 		usb_kill_urb(dln2->rx_urb[i]);
598 }
599 
600 static void dln2_free(struct dln2_dev *dln2)
601 {
602 	dln2_free_rx_urbs(dln2);
603 	usb_put_dev(dln2->usb_dev);
604 	kfree(dln2);
605 }
606 
607 static int dln2_setup_rx_urbs(struct dln2_dev *dln2,
608 			      struct usb_host_interface *hostif)
609 {
610 	int i;
611 	const int rx_max_size = DLN2_RX_BUF_SIZE;
612 
613 	for (i = 0; i < DLN2_MAX_URBS; i++) {
614 		dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL);
615 		if (!dln2->rx_buf[i])
616 			return -ENOMEM;
617 
618 		dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
619 		if (!dln2->rx_urb[i])
620 			return -ENOMEM;
621 
622 		usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev,
623 				  usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in),
624 				  dln2->rx_buf[i], rx_max_size, dln2_rx, dln2);
625 	}
626 
627 	return 0;
628 }
629 
630 static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp)
631 {
632 	struct device *dev = &dln2->interface->dev;
633 	int ret;
634 	int i;
635 
636 	for (i = 0; i < DLN2_MAX_URBS; i++) {
637 		ret = usb_submit_urb(dln2->rx_urb[i], gfp);
638 		if (ret < 0) {
639 			dev_err(dev, "failed to submit RX URB: %d\n", ret);
640 			return ret;
641 		}
642 	}
643 
644 	return 0;
645 }
646 
647 enum {
648 	DLN2_ACPI_MATCH_GPIO	= 0,
649 	DLN2_ACPI_MATCH_I2C	= 1,
650 	DLN2_ACPI_MATCH_SPI	= 2,
651 	DLN2_ACPI_MATCH_ADC	= 3,
652 };
653 
654 static struct dln2_platform_data dln2_pdata_gpio = {
655 	.handle = DLN2_HANDLE_GPIO,
656 };
657 
658 static struct mfd_cell_acpi_match dln2_acpi_match_gpio = {
659 	.adr = DLN2_ACPI_MATCH_GPIO,
660 };
661 
662 /* Only one I2C port seems to be supported on current hardware */
663 static struct dln2_platform_data dln2_pdata_i2c = {
664 	.handle = DLN2_HANDLE_I2C,
665 	.port = 0,
666 };
667 
668 static struct mfd_cell_acpi_match dln2_acpi_match_i2c = {
669 	.adr = DLN2_ACPI_MATCH_I2C,
670 };
671 
672 /* Only one SPI port supported */
673 static struct dln2_platform_data dln2_pdata_spi = {
674 	.handle = DLN2_HANDLE_SPI,
675 	.port = 0,
676 };
677 
678 static struct mfd_cell_acpi_match dln2_acpi_match_spi = {
679 	.adr = DLN2_ACPI_MATCH_SPI,
680 };
681 
682 /* Only one ADC port supported */
683 static struct dln2_platform_data dln2_pdata_adc = {
684 	.handle = DLN2_HANDLE_ADC,
685 	.port = 0,
686 };
687 
688 static struct mfd_cell_acpi_match dln2_acpi_match_adc = {
689 	.adr = DLN2_ACPI_MATCH_ADC,
690 };
691 
692 static const struct mfd_cell dln2_devs[] = {
693 	{
694 		.name = "dln2-gpio",
695 		.acpi_match = &dln2_acpi_match_gpio,
696 		.platform_data = &dln2_pdata_gpio,
697 		.pdata_size = sizeof(struct dln2_platform_data),
698 	},
699 	{
700 		.name = "dln2-i2c",
701 		.acpi_match = &dln2_acpi_match_i2c,
702 		.platform_data = &dln2_pdata_i2c,
703 		.pdata_size = sizeof(struct dln2_platform_data),
704 	},
705 	{
706 		.name = "dln2-spi",
707 		.acpi_match = &dln2_acpi_match_spi,
708 		.platform_data = &dln2_pdata_spi,
709 		.pdata_size = sizeof(struct dln2_platform_data),
710 	},
711 	{
712 		.name = "dln2-adc",
713 		.acpi_match = &dln2_acpi_match_adc,
714 		.platform_data = &dln2_pdata_adc,
715 		.pdata_size = sizeof(struct dln2_platform_data),
716 	},
717 };
718 
719 static void dln2_stop(struct dln2_dev *dln2)
720 {
721 	int i, j;
722 
723 	/* don't allow starting new transfers */
724 	spin_lock(&dln2->disconnect_lock);
725 	dln2->disconnect = true;
726 	spin_unlock(&dln2->disconnect_lock);
727 
728 	/* cancel in progress transfers */
729 	for (i = 0; i < DLN2_HANDLES; i++) {
730 		struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i];
731 		unsigned long flags;
732 
733 		spin_lock_irqsave(&rxs->lock, flags);
734 
735 		/* cancel all response waiters */
736 		for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) {
737 			struct dln2_rx_context *rxc = &rxs->slots[j];
738 
739 			if (rxc->in_use)
740 				complete(&rxc->done);
741 		}
742 
743 		spin_unlock_irqrestore(&rxs->lock, flags);
744 	}
745 
746 	/* wait for transfers to end */
747 	wait_event(dln2->disconnect_wq, !dln2->active_transfers);
748 
749 	dln2_stop_rx_urbs(dln2);
750 }
751 
752 static void dln2_disconnect(struct usb_interface *interface)
753 {
754 	struct dln2_dev *dln2 = usb_get_intfdata(interface);
755 
756 	dln2_stop(dln2);
757 
758 	mfd_remove_devices(&interface->dev);
759 
760 	dln2_free(dln2);
761 }
762 
763 static int dln2_probe(struct usb_interface *interface,
764 		      const struct usb_device_id *usb_id)
765 {
766 	struct usb_host_interface *hostif = interface->cur_altsetting;
767 	struct usb_endpoint_descriptor *epin;
768 	struct usb_endpoint_descriptor *epout;
769 	struct device *dev = &interface->dev;
770 	struct dln2_dev *dln2;
771 	int ret;
772 	int i, j;
773 
774 	if (hostif->desc.bInterfaceNumber != 0)
775 		return -ENODEV;
776 
777 	ret = usb_find_common_endpoints(hostif, &epin, &epout, NULL, NULL);
778 	if (ret)
779 		return ret;
780 
781 	dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL);
782 	if (!dln2)
783 		return -ENOMEM;
784 
785 	dln2->ep_out = epout->bEndpointAddress;
786 	dln2->ep_in = epin->bEndpointAddress;
787 	dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface));
788 	dln2->interface = interface;
789 	usb_set_intfdata(interface, dln2);
790 	init_waitqueue_head(&dln2->disconnect_wq);
791 
792 	for (i = 0; i < DLN2_HANDLES; i++) {
793 		init_waitqueue_head(&dln2->mod_rx_slots[i].wq);
794 		spin_lock_init(&dln2->mod_rx_slots[i].lock);
795 		for (j = 0; j < DLN2_MAX_RX_SLOTS; j++)
796 			init_completion(&dln2->mod_rx_slots[i].slots[j].done);
797 	}
798 
799 	spin_lock_init(&dln2->event_cb_lock);
800 	spin_lock_init(&dln2->disconnect_lock);
801 	INIT_LIST_HEAD(&dln2->event_cb_list);
802 
803 	ret = dln2_setup_rx_urbs(dln2, hostif);
804 	if (ret)
805 		goto out_free;
806 
807 	ret = dln2_start_rx_urbs(dln2, GFP_KERNEL);
808 	if (ret)
809 		goto out_stop_rx;
810 
811 	ret = dln2_hw_init(dln2);
812 	if (ret < 0) {
813 		dev_err(dev, "failed to initialize hardware\n");
814 		goto out_stop_rx;
815 	}
816 
817 	ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs));
818 	if (ret != 0) {
819 		dev_err(dev, "failed to add mfd devices to core\n");
820 		goto out_stop_rx;
821 	}
822 
823 	return 0;
824 
825 out_stop_rx:
826 	dln2_stop_rx_urbs(dln2);
827 
828 out_free:
829 	dln2_free(dln2);
830 
831 	return ret;
832 }
833 
834 static int dln2_suspend(struct usb_interface *iface, pm_message_t message)
835 {
836 	struct dln2_dev *dln2 = usb_get_intfdata(iface);
837 
838 	dln2_stop(dln2);
839 
840 	return 0;
841 }
842 
843 static int dln2_resume(struct usb_interface *iface)
844 {
845 	struct dln2_dev *dln2 = usb_get_intfdata(iface);
846 
847 	dln2->disconnect = false;
848 
849 	return dln2_start_rx_urbs(dln2, GFP_NOIO);
850 }
851 
852 static const struct usb_device_id dln2_table[] = {
853 	{ USB_DEVICE(0xa257, 0x2013) },
854 	{ }
855 };
856 
857 MODULE_DEVICE_TABLE(usb, dln2_table);
858 
859 static struct usb_driver dln2_driver = {
860 	.name = "dln2",
861 	.probe = dln2_probe,
862 	.disconnect = dln2_disconnect,
863 	.id_table = dln2_table,
864 	.suspend = dln2_suspend,
865 	.resume = dln2_resume,
866 };
867 
868 module_usb_driver(dln2_driver);
869 
870 MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
871 MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter");
872 MODULE_LICENSE("GPL v2");
873