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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
23struct dln2_header {
24 __le16 size;
25 __le16 id;
26 __le16 echo;
27 __le16 handle;
28};
29
30struct 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
46enum 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 */
62struct 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 */
79struct 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
93struct 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
113struct 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
120int 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_obj(*entry);
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}
155EXPORT_SYMBOL(dln2_register_event_cb);
156
157void 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}
181EXPORT_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 */
188static 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
210out:
211 if (!valid_slot)
212 dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot);
213
214 return valid_slot;
215}
216
217static 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
234static 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
296out:
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
302static 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
327static 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
348static 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
376static 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
393static 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
426static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd,
427 const void *obuf, unsigned int obuf_len,
428 void *ibuf, unsigned int *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
501out_free_rx_slot:
502 free_rx_slot(dln2, handle, rx_slot);
503out_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
513int dln2_transfer(struct platform_device *pdev, u16 cmd,
514 const void *obuf, unsigned int obuf_len,
515 void *ibuf, unsigned int *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}
528EXPORT_SYMBOL(dln2_transfer);
529
530static 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
552static 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
571static 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
582static 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}
589
590static void dln2_stop_rx_urbs(struct dln2_dev *dln2)
591{
592 int i;
593
594 for (i = 0; i < DLN2_MAX_URBS; i++)
595 usb_kill_urb(dln2->rx_urb[i]);
596}
597
598static void dln2_free(struct dln2_dev *dln2)
599{
600 dln2_free_rx_urbs(dln2);
601}
602
603static int dln2_setup_rx_urbs(struct dln2_dev *dln2,
604 struct usb_host_interface *hostif)
605{
606 int i;
607 const int rx_max_size = DLN2_RX_BUF_SIZE;
608 struct device *dev = &dln2->interface->dev;
609
610 for (i = 0; i < DLN2_MAX_URBS; i++) {
611 dln2->rx_buf[i] = devm_kmalloc(dev, rx_max_size, GFP_KERNEL);
612 if (!dln2->rx_buf[i])
613 return -ENOMEM;
614
615 dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
616 if (!dln2->rx_urb[i])
617 return -ENOMEM;
618
619 usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev,
620 usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in),
621 dln2->rx_buf[i], rx_max_size, dln2_rx, dln2);
622 }
623
624 return 0;
625}
626
627static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp)
628{
629 struct device *dev = &dln2->interface->dev;
630 int ret;
631 int i;
632
633 for (i = 0; i < DLN2_MAX_URBS; i++) {
634 ret = usb_submit_urb(dln2->rx_urb[i], gfp);
635 if (ret < 0) {
636 dev_err(dev, "failed to submit RX URB: %d\n", ret);
637 return ret;
638 }
639 }
640
641 return 0;
642}
643
644enum {
645 DLN2_ACPI_MATCH_GPIO = 0,
646 DLN2_ACPI_MATCH_I2C = 1,
647 DLN2_ACPI_MATCH_SPI = 2,
648 DLN2_ACPI_MATCH_ADC = 3,
649};
650
651static struct dln2_platform_data dln2_pdata_gpio = {
652 .handle = DLN2_HANDLE_GPIO,
653};
654
655static struct mfd_cell_acpi_match dln2_acpi_match_gpio = {
656 .adr = DLN2_ACPI_MATCH_GPIO,
657};
658
659/* Only one I2C port seems to be supported on current hardware */
660static struct dln2_platform_data dln2_pdata_i2c = {
661 .handle = DLN2_HANDLE_I2C,
662 .port = 0,
663};
664
665static struct mfd_cell_acpi_match dln2_acpi_match_i2c = {
666 .adr = DLN2_ACPI_MATCH_I2C,
667};
668
669/* Only one SPI port supported */
670static struct dln2_platform_data dln2_pdata_spi = {
671 .handle = DLN2_HANDLE_SPI,
672 .port = 0,
673};
674
675static struct mfd_cell_acpi_match dln2_acpi_match_spi = {
676 .adr = DLN2_ACPI_MATCH_SPI,
677};
678
679/* Only one ADC port supported */
680static struct dln2_platform_data dln2_pdata_adc = {
681 .handle = DLN2_HANDLE_ADC,
682 .port = 0,
683};
684
685static struct mfd_cell_acpi_match dln2_acpi_match_adc = {
686 .adr = DLN2_ACPI_MATCH_ADC,
687};
688
689static const struct mfd_cell dln2_devs[] = {
690 {
691 .name = "dln2-gpio",
692 .acpi_match = &dln2_acpi_match_gpio,
693 .platform_data = &dln2_pdata_gpio,
694 .pdata_size = sizeof(struct dln2_platform_data),
695 },
696 {
697 .name = "dln2-i2c",
698 .acpi_match = &dln2_acpi_match_i2c,
699 .platform_data = &dln2_pdata_i2c,
700 .pdata_size = sizeof(struct dln2_platform_data),
701 },
702 {
703 .name = "dln2-spi",
704 .acpi_match = &dln2_acpi_match_spi,
705 .platform_data = &dln2_pdata_spi,
706 .pdata_size = sizeof(struct dln2_platform_data),
707 },
708 {
709 .name = "dln2-adc",
710 .acpi_match = &dln2_acpi_match_adc,
711 .platform_data = &dln2_pdata_adc,
712 .pdata_size = sizeof(struct dln2_platform_data),
713 },
714};
715
716static void dln2_stop(struct dln2_dev *dln2)
717{
718 int i, j;
719
720 /* don't allow starting new transfers */
721 spin_lock(&dln2->disconnect_lock);
722 dln2->disconnect = true;
723 spin_unlock(&dln2->disconnect_lock);
724
725 /* cancel in progress transfers */
726 for (i = 0; i < DLN2_HANDLES; i++) {
727 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i];
728 unsigned long flags;
729
730 spin_lock_irqsave(&rxs->lock, flags);
731
732 /* cancel all response waiters */
733 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) {
734 struct dln2_rx_context *rxc = &rxs->slots[j];
735
736 if (rxc->in_use)
737 complete(&rxc->done);
738 }
739
740 spin_unlock_irqrestore(&rxs->lock, flags);
741 }
742
743 /* wait for transfers to end */
744 wait_event(dln2->disconnect_wq, !dln2->active_transfers);
745
746 dln2_stop_rx_urbs(dln2);
747}
748
749static void dln2_disconnect(struct usb_interface *interface)
750{
751 struct dln2_dev *dln2 = usb_get_intfdata(interface);
752
753 dln2_stop(dln2);
754
755 mfd_remove_devices(&interface->dev);
756
757 dln2_free(dln2);
758}
759
760static int dln2_probe(struct usb_interface *interface,
761 const struct usb_device_id *usb_id)
762{
763 struct usb_host_interface *hostif = interface->cur_altsetting;
764 struct usb_endpoint_descriptor *epin;
765 struct usb_endpoint_descriptor *epout;
766 struct device *dev = &interface->dev;
767 struct dln2_dev *dln2;
768 int ret;
769 int i, j;
770
771 if (hostif->desc.bInterfaceNumber != 0)
772 return -ENODEV;
773
774 ret = usb_find_common_endpoints(hostif, &epin, &epout, NULL, NULL);
775 if (ret)
776 return ret;
777
778 dln2 = devm_kzalloc(dev, sizeof(*dln2), GFP_KERNEL);
779 if (!dln2)
780 return -ENOMEM;
781
782 dln2->ep_out = epout->bEndpointAddress;
783 dln2->ep_in = epin->bEndpointAddress;
784 dln2->usb_dev = interface_to_usbdev(interface);
785 dln2->interface = interface;
786 usb_set_intfdata(interface, dln2);
787 init_waitqueue_head(&dln2->disconnect_wq);
788
789 for (i = 0; i < DLN2_HANDLES; i++) {
790 init_waitqueue_head(&dln2->mod_rx_slots[i].wq);
791 spin_lock_init(&dln2->mod_rx_slots[i].lock);
792 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++)
793 init_completion(&dln2->mod_rx_slots[i].slots[j].done);
794 }
795
796 spin_lock_init(&dln2->event_cb_lock);
797 spin_lock_init(&dln2->disconnect_lock);
798 INIT_LIST_HEAD(&dln2->event_cb_list);
799
800 ret = dln2_setup_rx_urbs(dln2, hostif);
801 if (ret)
802 goto out_free;
803
804 ret = dln2_start_rx_urbs(dln2, GFP_KERNEL);
805 if (ret)
806 goto out_stop_rx;
807
808 ret = dln2_hw_init(dln2);
809 if (ret < 0) {
810 dev_err(dev, "failed to initialize hardware\n");
811 goto out_stop_rx;
812 }
813
814 ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs));
815 if (ret != 0) {
816 dev_err(dev, "failed to add mfd devices to core\n");
817 goto out_stop_rx;
818 }
819
820 return 0;
821
822out_stop_rx:
823 dln2_stop_rx_urbs(dln2);
824
825out_free:
826 dln2_free(dln2);
827
828 return ret;
829}
830
831static int dln2_suspend(struct usb_interface *iface, pm_message_t message)
832{
833 struct dln2_dev *dln2 = usb_get_intfdata(iface);
834
835 dln2_stop(dln2);
836
837 return 0;
838}
839
840static int dln2_resume(struct usb_interface *iface)
841{
842 struct dln2_dev *dln2 = usb_get_intfdata(iface);
843
844 dln2->disconnect = false;
845
846 return dln2_start_rx_urbs(dln2, GFP_NOIO);
847}
848
849static const struct usb_device_id dln2_table[] = {
850 { USB_DEVICE(0xa257, 0x2013) },
851 { }
852};
853
854MODULE_DEVICE_TABLE(usb, dln2_table);
855
856static struct usb_driver dln2_driver = {
857 .name = "dln2",
858 .probe = dln2_probe,
859 .disconnect = dln2_disconnect,
860 .id_table = dln2_table,
861 .suspend = dln2_suspend,
862 .resume = dln2_resume,
863};
864
865module_usb_driver(dln2_driver);
866
867MODULE_AUTHOR("Octavian Purdila <[email protected]>");
868MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter");
869MODULE_LICENSE("GPL v2");