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/i2c.h>
18 #include <linux/mutex.h>
19 #include <linux/platform_device.h>
20 #include <linux/mfd/core.h>
21 #include <linux/mfd/dln2.h>
22 #include <linux/rculist.h>
23
24 struct dln2_header {
25 __le16 size;
26 __le16 id;
27 __le16 echo;
28 __le16 handle;
29 };
30
31 struct dln2_response {
32 struct dln2_header hdr;
33 __le16 result;
34 };
35
36 #define DLN2_GENERIC_MODULE_ID 0x00
37 #define DLN2_GENERIC_CMD(cmd) DLN2_CMD(cmd, DLN2_GENERIC_MODULE_ID)
38 #define CMD_GET_DEVICE_VER DLN2_GENERIC_CMD(0x30)
39 #define CMD_GET_DEVICE_SN DLN2_GENERIC_CMD(0x31)
40
41 #define DLN2_HW_ID 0x200
42 #define DLN2_USB_TIMEOUT 200 /* in ms */
43 #define DLN2_MAX_RX_SLOTS 16
44 #define DLN2_MAX_URBS 16
45 #define DLN2_RX_BUF_SIZE 512
46
47 enum dln2_handle {
48 DLN2_HANDLE_EVENT = 0, /* don't change, hardware defined */
49 DLN2_HANDLE_CTRL,
50 DLN2_HANDLE_GPIO,
51 DLN2_HANDLE_I2C,
52 DLN2_HANDLE_SPI,
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
dln2_register_event_cb(struct platform_device * pdev,u16 id,dln2_event_cb_t event_cb)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
dln2_unregister_event_cb(struct platform_device * pdev,u16 id)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 */
dln2_transfer_complete(struct dln2_dev * dln2,struct urb * urb,u16 handle,u16 rx_slot)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
dln2_run_event_callbacks(struct dln2_dev * dln2,u16 id,u16 echo,void * data,int len)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
dln2_rx(struct urb * urb)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 dln2_run_event_callbacks(dln2, id, echo, data, len);
286 } else {
287 /* URB will be re-submitted in _dln2_transfer (free_rx_slot) */
288 if (dln2_transfer_complete(dln2, urb, handle, echo))
289 return;
290 }
291
292 out:
293 err = usb_submit_urb(urb, GFP_ATOMIC);
294 if (err < 0)
295 dev_err(dev, "failed to resubmit RX URB: %d\n", err);
296 }
297
dln2_prep_buf(u16 handle,u16 cmd,u16 echo,const void * obuf,int * obuf_len,gfp_t gfp)298 static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf,
299 int *obuf_len, gfp_t gfp)
300 {
301 int len;
302 void *buf;
303 struct dln2_header *hdr;
304
305 len = *obuf_len + sizeof(*hdr);
306 buf = kmalloc(len, gfp);
307 if (!buf)
308 return NULL;
309
310 hdr = (struct dln2_header *)buf;
311 hdr->id = cpu_to_le16(cmd);
312 hdr->size = cpu_to_le16(len);
313 hdr->echo = cpu_to_le16(echo);
314 hdr->handle = cpu_to_le16(handle);
315
316 memcpy(buf + sizeof(*hdr), obuf, *obuf_len);
317
318 *obuf_len = len;
319
320 return buf;
321 }
322
dln2_send_wait(struct dln2_dev * dln2,u16 handle,u16 cmd,u16 echo,const void * obuf,int obuf_len)323 static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo,
324 const void *obuf, int obuf_len)
325 {
326 int ret = 0;
327 int len = obuf_len;
328 void *buf;
329 int actual;
330
331 buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL);
332 if (!buf)
333 return -ENOMEM;
334
335 ret = usb_bulk_msg(dln2->usb_dev,
336 usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out),
337 buf, len, &actual, DLN2_USB_TIMEOUT);
338
339 kfree(buf);
340
341 return ret;
342 }
343
find_free_slot(struct dln2_dev * dln2,u16 handle,int * slot)344 static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot)
345 {
346 struct dln2_mod_rx_slots *rxs;
347 unsigned long flags;
348
349 if (dln2->disconnect) {
350 *slot = -ENODEV;
351 return true;
352 }
353
354 rxs = &dln2->mod_rx_slots[handle];
355
356 spin_lock_irqsave(&rxs->lock, flags);
357
358 *slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS);
359
360 if (*slot < DLN2_MAX_RX_SLOTS) {
361 struct dln2_rx_context *rxc = &rxs->slots[*slot];
362
363 set_bit(*slot, rxs->bmap);
364 rxc->in_use = true;
365 }
366
367 spin_unlock_irqrestore(&rxs->lock, flags);
368
369 return *slot < DLN2_MAX_RX_SLOTS;
370 }
371
alloc_rx_slot(struct dln2_dev * dln2,u16 handle)372 static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle)
373 {
374 int ret;
375 int slot;
376
377 /*
378 * No need to timeout here, the wait is bounded by the timeout in
379 * _dln2_transfer.
380 */
381 ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq,
382 find_free_slot(dln2, handle, &slot));
383 if (ret < 0)
384 return ret;
385
386 return slot;
387 }
388
free_rx_slot(struct dln2_dev * dln2,u16 handle,int slot)389 static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot)
390 {
391 struct dln2_mod_rx_slots *rxs;
392 struct urb *urb = NULL;
393 unsigned long flags;
394 struct dln2_rx_context *rxc;
395
396 rxs = &dln2->mod_rx_slots[handle];
397
398 spin_lock_irqsave(&rxs->lock, flags);
399
400 clear_bit(slot, rxs->bmap);
401
402 rxc = &rxs->slots[slot];
403 rxc->in_use = false;
404 urb = rxc->urb;
405 rxc->urb = NULL;
406 reinit_completion(&rxc->done);
407
408 spin_unlock_irqrestore(&rxs->lock, flags);
409
410 if (urb) {
411 int err;
412 struct device *dev = &dln2->interface->dev;
413
414 err = usb_submit_urb(urb, GFP_KERNEL);
415 if (err < 0)
416 dev_err(dev, "failed to resubmit RX URB: %d\n", err);
417 }
418
419 wake_up_interruptible(&rxs->wq);
420 }
421
_dln2_transfer(struct dln2_dev * dln2,u16 handle,u16 cmd,const void * obuf,unsigned obuf_len,void * ibuf,unsigned * ibuf_len)422 static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd,
423 const void *obuf, unsigned obuf_len,
424 void *ibuf, unsigned *ibuf_len)
425 {
426 int ret = 0;
427 int rx_slot;
428 struct dln2_response *rsp;
429 struct dln2_rx_context *rxc;
430 struct device *dev = &dln2->interface->dev;
431 const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT);
432 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle];
433 int size;
434
435 spin_lock(&dln2->disconnect_lock);
436 if (!dln2->disconnect)
437 dln2->active_transfers++;
438 else
439 ret = -ENODEV;
440 spin_unlock(&dln2->disconnect_lock);
441
442 if (ret)
443 return ret;
444
445 rx_slot = alloc_rx_slot(dln2, handle);
446 if (rx_slot < 0) {
447 ret = rx_slot;
448 goto out_decr;
449 }
450
451 ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len);
452 if (ret < 0) {
453 dev_err(dev, "USB write failed: %d\n", ret);
454 goto out_free_rx_slot;
455 }
456
457 rxc = &rxs->slots[rx_slot];
458
459 ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout);
460 if (ret <= 0) {
461 if (!ret)
462 ret = -ETIMEDOUT;
463 goto out_free_rx_slot;
464 } else {
465 ret = 0;
466 }
467
468 if (dln2->disconnect) {
469 ret = -ENODEV;
470 goto out_free_rx_slot;
471 }
472
473 /* if we got here we know that the response header has been checked */
474 rsp = rxc->urb->transfer_buffer;
475 size = le16_to_cpu(rsp->hdr.size);
476
477 if (size < sizeof(*rsp)) {
478 ret = -EPROTO;
479 goto out_free_rx_slot;
480 }
481
482 if (le16_to_cpu(rsp->result) > 0x80) {
483 dev_dbg(dev, "%d received response with error %d\n",
484 handle, le16_to_cpu(rsp->result));
485 ret = -EREMOTEIO;
486 goto out_free_rx_slot;
487 }
488
489 if (!ibuf)
490 goto out_free_rx_slot;
491
492 if (*ibuf_len > size - sizeof(*rsp))
493 *ibuf_len = size - sizeof(*rsp);
494
495 memcpy(ibuf, rsp + 1, *ibuf_len);
496
497 out_free_rx_slot:
498 free_rx_slot(dln2, handle, rx_slot);
499 out_decr:
500 spin_lock(&dln2->disconnect_lock);
501 dln2->active_transfers--;
502 spin_unlock(&dln2->disconnect_lock);
503 if (dln2->disconnect)
504 wake_up(&dln2->disconnect_wq);
505
506 return ret;
507 }
508
dln2_transfer(struct platform_device * pdev,u16 cmd,const void * obuf,unsigned obuf_len,void * ibuf,unsigned * ibuf_len)509 int dln2_transfer(struct platform_device *pdev, u16 cmd,
510 const void *obuf, unsigned obuf_len,
511 void *ibuf, unsigned *ibuf_len)
512 {
513 struct dln2_platform_data *dln2_pdata;
514 struct dln2_dev *dln2;
515 u16 handle;
516
517 dln2 = dev_get_drvdata(pdev->dev.parent);
518 dln2_pdata = dev_get_platdata(&pdev->dev);
519 handle = dln2_pdata->handle;
520
521 return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf,
522 ibuf_len);
523 }
524 EXPORT_SYMBOL(dln2_transfer);
525
dln2_check_hw(struct dln2_dev * dln2)526 static int dln2_check_hw(struct dln2_dev *dln2)
527 {
528 int ret;
529 __le32 hw_type;
530 int len = sizeof(hw_type);
531
532 ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER,
533 NULL, 0, &hw_type, &len);
534 if (ret < 0)
535 return ret;
536 if (len < sizeof(hw_type))
537 return -EREMOTEIO;
538
539 if (le32_to_cpu(hw_type) != DLN2_HW_ID) {
540 dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n",
541 le32_to_cpu(hw_type));
542 return -ENODEV;
543 }
544
545 return 0;
546 }
547
dln2_print_serialno(struct dln2_dev * dln2)548 static int dln2_print_serialno(struct dln2_dev *dln2)
549 {
550 int ret;
551 __le32 serial_no;
552 int len = sizeof(serial_no);
553 struct device *dev = &dln2->interface->dev;
554
555 ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0,
556 &serial_no, &len);
557 if (ret < 0)
558 return ret;
559 if (len < sizeof(serial_no))
560 return -EREMOTEIO;
561
562 dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no));
563
564 return 0;
565 }
566
dln2_hw_init(struct dln2_dev * dln2)567 static int dln2_hw_init(struct dln2_dev *dln2)
568 {
569 int ret;
570
571 ret = dln2_check_hw(dln2);
572 if (ret < 0)
573 return ret;
574
575 return dln2_print_serialno(dln2);
576 }
577
dln2_free_rx_urbs(struct dln2_dev * dln2)578 static void dln2_free_rx_urbs(struct dln2_dev *dln2)
579 {
580 int i;
581
582 for (i = 0; i < DLN2_MAX_URBS; i++) {
583 usb_free_urb(dln2->rx_urb[i]);
584 kfree(dln2->rx_buf[i]);
585 }
586 }
587
dln2_stop_rx_urbs(struct dln2_dev * dln2)588 static void dln2_stop_rx_urbs(struct dln2_dev *dln2)
589 {
590 int i;
591
592 for (i = 0; i < DLN2_MAX_URBS; i++)
593 usb_kill_urb(dln2->rx_urb[i]);
594 }
595
dln2_free(struct dln2_dev * dln2)596 static void dln2_free(struct dln2_dev *dln2)
597 {
598 dln2_free_rx_urbs(dln2);
599 usb_put_dev(dln2->usb_dev);
600 kfree(dln2);
601 }
602
dln2_setup_rx_urbs(struct dln2_dev * dln2,struct usb_host_interface * hostif)603 static 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
609 for (i = 0; i < DLN2_MAX_URBS; i++) {
610 dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL);
611 if (!dln2->rx_buf[i])
612 return -ENOMEM;
613
614 dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
615 if (!dln2->rx_urb[i])
616 return -ENOMEM;
617
618 usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev,
619 usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in),
620 dln2->rx_buf[i], rx_max_size, dln2_rx, dln2);
621 }
622
623 return 0;
624 }
625
dln2_start_rx_urbs(struct dln2_dev * dln2,gfp_t gfp)626 static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp)
627 {
628 struct device *dev = &dln2->interface->dev;
629 int ret;
630 int i;
631
632 for (i = 0; i < DLN2_MAX_URBS; i++) {
633 ret = usb_submit_urb(dln2->rx_urb[i], gfp);
634 if (ret < 0) {
635 dev_err(dev, "failed to submit RX URB: %d\n", ret);
636 return ret;
637 }
638 }
639
640 return 0;
641 }
642
643 static struct dln2_platform_data dln2_pdata_gpio = {
644 .handle = DLN2_HANDLE_GPIO,
645 };
646
647 /* Only one I2C port seems to be supported on current hardware */
648 static struct dln2_platform_data dln2_pdata_i2c = {
649 .handle = DLN2_HANDLE_I2C,
650 .port = 0,
651 };
652
653 /* Only one SPI port supported */
654 static struct dln2_platform_data dln2_pdata_spi = {
655 .handle = DLN2_HANDLE_SPI,
656 .port = 0,
657 };
658
659 static const struct mfd_cell dln2_devs[] = {
660 {
661 .name = "dln2-gpio",
662 .platform_data = &dln2_pdata_gpio,
663 .pdata_size = sizeof(struct dln2_platform_data),
664 },
665 {
666 .name = "dln2-i2c",
667 .platform_data = &dln2_pdata_i2c,
668 .pdata_size = sizeof(struct dln2_platform_data),
669 },
670 {
671 .name = "dln2-spi",
672 .platform_data = &dln2_pdata_spi,
673 .pdata_size = sizeof(struct dln2_platform_data),
674 },
675 };
676
dln2_stop(struct dln2_dev * dln2)677 static void dln2_stop(struct dln2_dev *dln2)
678 {
679 int i, j;
680
681 /* don't allow starting new transfers */
682 spin_lock(&dln2->disconnect_lock);
683 dln2->disconnect = true;
684 spin_unlock(&dln2->disconnect_lock);
685
686 /* cancel in progress transfers */
687 for (i = 0; i < DLN2_HANDLES; i++) {
688 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i];
689 unsigned long flags;
690
691 spin_lock_irqsave(&rxs->lock, flags);
692
693 /* cancel all response waiters */
694 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) {
695 struct dln2_rx_context *rxc = &rxs->slots[j];
696
697 if (rxc->in_use)
698 complete(&rxc->done);
699 }
700
701 spin_unlock_irqrestore(&rxs->lock, flags);
702 }
703
704 /* wait for transfers to end */
705 wait_event(dln2->disconnect_wq, !dln2->active_transfers);
706
707 dln2_stop_rx_urbs(dln2);
708 }
709
dln2_disconnect(struct usb_interface * interface)710 static void dln2_disconnect(struct usb_interface *interface)
711 {
712 struct dln2_dev *dln2 = usb_get_intfdata(interface);
713
714 dln2_stop(dln2);
715
716 mfd_remove_devices(&interface->dev);
717
718 dln2_free(dln2);
719 }
720
dln2_probe(struct usb_interface * interface,const struct usb_device_id * usb_id)721 static int dln2_probe(struct usb_interface *interface,
722 const struct usb_device_id *usb_id)
723 {
724 struct usb_host_interface *hostif = interface->cur_altsetting;
725 struct device *dev = &interface->dev;
726 struct dln2_dev *dln2;
727 int ret;
728 int i, j;
729
730 if (hostif->desc.bInterfaceNumber != 0 ||
731 hostif->desc.bNumEndpoints < 2)
732 return -ENODEV;
733
734 dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL);
735 if (!dln2)
736 return -ENOMEM;
737
738 dln2->ep_out = hostif->endpoint[0].desc.bEndpointAddress;
739 dln2->ep_in = hostif->endpoint[1].desc.bEndpointAddress;
740 dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface));
741 dln2->interface = interface;
742 usb_set_intfdata(interface, dln2);
743 init_waitqueue_head(&dln2->disconnect_wq);
744
745 for (i = 0; i < DLN2_HANDLES; i++) {
746 init_waitqueue_head(&dln2->mod_rx_slots[i].wq);
747 spin_lock_init(&dln2->mod_rx_slots[i].lock);
748 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++)
749 init_completion(&dln2->mod_rx_slots[i].slots[j].done);
750 }
751
752 spin_lock_init(&dln2->event_cb_lock);
753 spin_lock_init(&dln2->disconnect_lock);
754 INIT_LIST_HEAD(&dln2->event_cb_list);
755
756 ret = dln2_setup_rx_urbs(dln2, hostif);
757 if (ret)
758 goto out_free;
759
760 ret = dln2_start_rx_urbs(dln2, GFP_KERNEL);
761 if (ret)
762 goto out_stop_rx;
763
764 ret = dln2_hw_init(dln2);
765 if (ret < 0) {
766 dev_err(dev, "failed to initialize hardware\n");
767 goto out_stop_rx;
768 }
769
770 ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs));
771 if (ret != 0) {
772 dev_err(dev, "failed to add mfd devices to core\n");
773 goto out_stop_rx;
774 }
775
776 return 0;
777
778 out_stop_rx:
779 dln2_stop_rx_urbs(dln2);
780
781 out_free:
782 dln2_free(dln2);
783
784 return ret;
785 }
786
dln2_suspend(struct usb_interface * iface,pm_message_t message)787 static int dln2_suspend(struct usb_interface *iface, pm_message_t message)
788 {
789 struct dln2_dev *dln2 = usb_get_intfdata(iface);
790
791 dln2_stop(dln2);
792
793 return 0;
794 }
795
dln2_resume(struct usb_interface * iface)796 static int dln2_resume(struct usb_interface *iface)
797 {
798 struct dln2_dev *dln2 = usb_get_intfdata(iface);
799
800 dln2->disconnect = false;
801
802 return dln2_start_rx_urbs(dln2, GFP_NOIO);
803 }
804
805 static const struct usb_device_id dln2_table[] = {
806 { USB_DEVICE(0xa257, 0x2013) },
807 { }
808 };
809
810 MODULE_DEVICE_TABLE(usb, dln2_table);
811
812 static struct usb_driver dln2_driver = {
813 .name = "dln2",
814 .probe = dln2_probe,
815 .disconnect = dln2_disconnect,
816 .id_table = dln2_table,
817 .suspend = dln2_suspend,
818 .resume = dln2_resume,
819 };
820
821 module_usb_driver(dln2_driver);
822
823 MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
824 MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter");
825 MODULE_LICENSE("GPL v2");
826