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Merge branch 'for-next' into for-linus
[linux-block.git] / drivers / mfd / dln2.c
CommitLineData
a10e763b 1// SPDX-License-Identifier: GPL-2.0-only
338a1281
OP		 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
338a1281
OP		 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
24struct dln2_header {
25 __le16 size;
26 __le16 id;
27 __le16 echo;
28 __le16 handle;
29};
30
31struct 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
47enum dln2_handle {
48 DLN2_HANDLE_EVENT = 0, /* don't change, hardware defined */
49 DLN2_HANDLE_CTRL,
50 DLN2_HANDLE_GPIO,
51 DLN2_HANDLE_I2C,
21cf3318 52 DLN2_HANDLE_SPI,
313c84b5 53 DLN2_HANDLE_ADC,
338a1281
OP		 54 DLN2_HANDLES
55};
56
57/*
58 * Receive context used between the receive demultiplexer and the transfer
59 * routine. While sending a request the transfer routine will look for a free
60 * receive context and use it to wait for a response and to receive the URB and
61 * thus the response data.
62 */
63struct dln2_rx_context {
64 /* completion used to wait for a response */
65 struct completion done;
66
67 /* if non-NULL the URB contains the response */
68 struct urb *urb;
69
70 /* if true then this context is used to wait for a response */
71 bool in_use;
72};
73
74/*
75 * Receive contexts for a particular DLN2 module (i2c, gpio, etc.). We use the
76 * handle header field to identify the module in dln2_dev.mod_rx_slots and then
77 * the echo header field to index the slots field and find the receive context
78 * for a particular request.
79 */
80struct dln2_mod_rx_slots {
81 /* RX slots bitmap */
82 DECLARE_BITMAP(bmap, DLN2_MAX_RX_SLOTS);
83
84 /* used to wait for a free RX slot */
85 wait_queue_head_t wq;
86
87 /* used to wait for an RX operation to complete */
88 struct dln2_rx_context slots[DLN2_MAX_RX_SLOTS];
89
90 /* avoid races between alloc/free_rx_slot and dln2_rx_transfer */
91 spinlock_t lock;
92};
93
94struct dln2_dev {
95 struct usb_device *usb_dev;
96 struct usb_interface *interface;
97 u8 ep_in;
98 u8 ep_out;
99
100 struct urb *rx_urb[DLN2_MAX_URBS];
101 void *rx_buf[DLN2_MAX_URBS];
102
103 struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES];
104
105 struct list_head event_cb_list;
106 spinlock_t event_cb_lock;
107
108 bool disconnect;
109 int active_transfers;
110 wait_queue_head_t disconnect_wq;
111 spinlock_t disconnect_lock;
112};
113
114struct dln2_event_cb_entry {
115 struct list_head list;
116 u16 id;
117 struct platform_device *pdev;
118 dln2_event_cb_t callback;
119};
120
121int dln2_register_event_cb(struct platform_device *pdev, u16 id,
122 dln2_event_cb_t event_cb)
123{
124 struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent);
125 struct dln2_event_cb_entry *i, *entry;
126 unsigned long flags;
127 int ret = 0;
128
129 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
130 if (!entry)
131 return -ENOMEM;
132
133 entry->id = id;
134 entry->callback = event_cb;
135 entry->pdev = pdev;
136
137 spin_lock_irqsave(&dln2->event_cb_lock, flags);
138
139 list_for_each_entry(i, &dln2->event_cb_list, list) {
140 if (i->id == id) {
141 ret = -EBUSY;
142 break;
143 }
144 }
145
146 if (!ret)
147 list_add_rcu(&entry->list, &dln2->event_cb_list);
148
149 spin_unlock_irqrestore(&dln2->event_cb_lock, flags);
150
151 if (ret)
152 kfree(entry);
153
154 return ret;
155}
156EXPORT_SYMBOL(dln2_register_event_cb);
157
158void dln2_unregister_event_cb(struct platform_device *pdev, u16 id)
159{
160 struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent);
161 struct dln2_event_cb_entry *i;
162 unsigned long flags;
163 bool found = false;
164
165 spin_lock_irqsave(&dln2->event_cb_lock, flags);
166
167 list_for_each_entry(i, &dln2->event_cb_list, list) {
168 if (i->id == id) {
169 list_del_rcu(&i->list);
170 found = true;
171 break;
172 }
173 }
174
175 spin_unlock_irqrestore(&dln2->event_cb_lock, flags);
176
177 if (found) {
178 synchronize_rcu();
179 kfree(i);
180 }
181}
182EXPORT_SYMBOL(dln2_unregister_event_cb);
183
184/*
185 * Returns true if a valid transfer slot is found. In this case the URB must not
186 * be resubmitted immediately in dln2_rx as we need the data when dln2_transfer
187 * is woke up. It will be resubmitted there.
188 */
189static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb,
190 u16 handle, u16 rx_slot)
191{
192 struct device *dev = &dln2->interface->dev;
193 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle];
194 struct dln2_rx_context *rxc;
50d44f82 195 unsigned long flags;
338a1281
OP		 196 bool valid_slot = false;
197
00ee7a37
OP		 198 if (rx_slot >= DLN2_MAX_RX_SLOTS)
199 goto out;
200
338a1281
OP		 201 rxc = &rxs->slots[rx_slot];
202
50d44f82 203 spin_lock_irqsave(&rxs->lock, flags);
338a1281
OP		 204 if (rxc->in_use && !rxc->urb) {
205 rxc->urb = urb;
206 complete(&rxc->done);
207 valid_slot = true;
208 }
50d44f82 209 spin_unlock_irqrestore(&rxs->lock, flags);
338a1281 210
00ee7a37 211out:
338a1281
OP		 212 if (!valid_slot)
213 dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot);
214
215 return valid_slot;
216}
217
218static void dln2_run_event_callbacks(struct dln2_dev *dln2, u16 id, u16 echo,
219 void *data, int len)
220{
221 struct dln2_event_cb_entry *i;
222
223 rcu_read_lock();
224
225 list_for_each_entry_rcu(i, &dln2->event_cb_list, list) {
226 if (i->id == id) {
227 i->callback(i->pdev, echo, data, len);
228 break;
229 }
230 }
231
232 rcu_read_unlock();
233}
234
235static void dln2_rx(struct urb *urb)
236{
237 struct dln2_dev *dln2 = urb->context;
238 struct dln2_header *hdr = urb->transfer_buffer;
239 struct device *dev = &dln2->interface->dev;
240 u16 id, echo, handle, size;
241 u8 *data;
242 int len;
243 int err;
244
245 switch (urb->status) {
246 case 0:
247 /* success */
248 break;
249 case -ECONNRESET:
250 case -ENOENT:
251 case -ESHUTDOWN:
252 case -EPIPE:
253 /* this urb is terminated, clean up */
254 dev_dbg(dev, "urb shutting down with status %d\n", urb->status);
255 return;
256 default:
257 dev_dbg(dev, "nonzero urb status received %d\n", urb->status);
258 goto out;
259 }
260
261 if (urb->actual_length < sizeof(struct dln2_header)) {
262 dev_err(dev, "short response: %d\n", urb->actual_length);
263 goto out;
264 }
265
266 handle = le16_to_cpu(hdr->handle);
267 id = le16_to_cpu(hdr->id);
268 echo = le16_to_cpu(hdr->echo);
269 size = le16_to_cpu(hdr->size);
270
271 if (size != urb->actual_length) {
272 dev_err(dev, "size mismatch: handle %x cmd %x echo %x size %d actual %d\n",
273 handle, id, echo, size, urb->actual_length);
274 goto out;
275 }
276
277 if (handle >= DLN2_HANDLES) {
278 dev_warn(dev, "invalid handle %d\n", handle);
279 goto out;
280 }
281
282 data = urb->transfer_buffer + sizeof(struct dln2_header);
283 len = urb->actual_length - sizeof(struct dln2_header);
284
285 if (handle == DLN2_HANDLE_EVENT) {
3d858942
AS		 286 unsigned long flags;
287
288 spin_lock_irqsave(&dln2->event_cb_lock, flags);
338a1281 289 dln2_run_event_callbacks(dln2, id, echo, data, len);
3d858942 290 spin_unlock_irqrestore(&dln2->event_cb_lock, flags);
338a1281
OP		 291 } else {
292 /* URB will be re-submitted in _dln2_transfer (free_rx_slot) */
293 if (dln2_transfer_complete(dln2, urb, handle, echo))
294 return;
295 }
296
297out:
298 err = usb_submit_urb(urb, GFP_ATOMIC);
299 if (err < 0)
300 dev_err(dev, "failed to resubmit RX URB: %d\n", err);
301}
302
303static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf,
304 int *obuf_len, gfp_t gfp)
305{
306 int len;
307 void *buf;
308 struct dln2_header *hdr;
309
310 len = *obuf_len + sizeof(*hdr);
311 buf = kmalloc(len, gfp);
312 if (!buf)
313 return NULL;
314
315 hdr = (struct dln2_header *)buf;
316 hdr->id = cpu_to_le16(cmd);
317 hdr->size = cpu_to_le16(len);
318 hdr->echo = cpu_to_le16(echo);
319 hdr->handle = cpu_to_le16(handle);
320
321 memcpy(buf + sizeof(*hdr), obuf, *obuf_len);
322
323 *obuf_len = len;
324
325 return buf;
326}
327
328static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo,
329 const void *obuf, int obuf_len)
330{
331 int ret = 0;
332 int len = obuf_len;
333 void *buf;
334 int actual;
335
336 buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL);
337 if (!buf)
338 return -ENOMEM;
339
340 ret = usb_bulk_msg(dln2->usb_dev,
341 usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out),
342 buf, len, &actual, DLN2_USB_TIMEOUT);
343
344 kfree(buf);
345
346 return ret;
347}
348
349static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot)
350{
351 struct dln2_mod_rx_slots *rxs;
352 unsigned long flags;
353
354 if (dln2->disconnect) {
355 *slot = -ENODEV;
356 return true;
357 }
358
359 rxs = &dln2->mod_rx_slots[handle];
360
361 spin_lock_irqsave(&rxs->lock, flags);
362
363 *slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS);
364
365 if (*slot < DLN2_MAX_RX_SLOTS) {
366 struct dln2_rx_context *rxc = &rxs->slots[*slot];
367
368 set_bit(*slot, rxs->bmap);
369 rxc->in_use = true;
370 }
371
372 spin_unlock_irqrestore(&rxs->lock, flags);
373
374 return *slot < DLN2_MAX_RX_SLOTS;
375}
376
377static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle)
378{
379 int ret;
380 int slot;
381
382 /*
383 * No need to timeout here, the wait is bounded by the timeout in
384 * _dln2_transfer.
385 */
386 ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq,
387 find_free_slot(dln2, handle, &slot));
388 if (ret < 0)
389 return ret;
390
391 return slot;
392}
393
394static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot)
395{
396 struct dln2_mod_rx_slots *rxs;
397 struct urb *urb = NULL;
398 unsigned long flags;
399 struct dln2_rx_context *rxc;
400
401 rxs = &dln2->mod_rx_slots[handle];
402
403 spin_lock_irqsave(&rxs->lock, flags);
404
405 clear_bit(slot, rxs->bmap);
406
407 rxc = &rxs->slots[slot];
408 rxc->in_use = false;
409 urb = rxc->urb;
410 rxc->urb = NULL;
411 reinit_completion(&rxc->done);
412
413 spin_unlock_irqrestore(&rxs->lock, flags);
414
415 if (urb) {
416 int err;
417 struct device *dev = &dln2->interface->dev;
418
419 err = usb_submit_urb(urb, GFP_KERNEL);
420 if (err < 0)
421 dev_err(dev, "failed to resubmit RX URB: %d\n", err);
422 }
423
424 wake_up_interruptible(&rxs->wq);
425}
426
427static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd,
428 const void *obuf, unsigned obuf_len,
429 void *ibuf, unsigned *ibuf_len)
430{
431 int ret = 0;
432 int rx_slot;
433 struct dln2_response *rsp;
434 struct dln2_rx_context *rxc;
435 struct device *dev = &dln2->interface->dev;
48579a9a 436 const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT);
338a1281 437 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle];
2fc2b484 438 int size;
338a1281
OP		 439
440 spin_lock(&dln2->disconnect_lock);
441 if (!dln2->disconnect)
442 dln2->active_transfers++;
443 else
444 ret = -ENODEV;
445 spin_unlock(&dln2->disconnect_lock);
446
447 if (ret)
448 return ret;
449
450 rx_slot = alloc_rx_slot(dln2, handle);
451 if (rx_slot < 0) {
452 ret = rx_slot;
453 goto out_decr;
454 }
455
456 ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len);
457 if (ret < 0) {
458 dev_err(dev, "USB write failed: %d\n", ret);
459 goto out_free_rx_slot;
460 }
461
462 rxc = &rxs->slots[rx_slot];
463
464 ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout);
465 if (ret <= 0) {
466 if (!ret)
467 ret = -ETIMEDOUT;
468 goto out_free_rx_slot;
7ca2b1c6
OP		 469 } else {
470 ret = 0;
338a1281
OP		 471 }
472
473 if (dln2->disconnect) {
474 ret = -ENODEV;
475 goto out_free_rx_slot;
476 }
477
478 /* if we got here we know that the response header has been checked */
479 rsp = rxc->urb->transfer_buffer;
2fc2b484 480 size = le16_to_cpu(rsp->hdr.size);
338a1281 481
2fc2b484 482 if (size < sizeof(*rsp)) {
338a1281
OP		 483 ret = -EPROTO;
484 goto out_free_rx_slot;
485 }
486
487 if (le16_to_cpu(rsp->result) > 0x80) {
488 dev_dbg(dev, "%d received response with error %d\n",
489 handle, le16_to_cpu(rsp->result));
490 ret = -EREMOTEIO;
491 goto out_free_rx_slot;
492 }
493
7ca2b1c6 494 if (!ibuf)
338a1281 495 goto out_free_rx_slot;
338a1281 496
2fc2b484
DC		 497 if (*ibuf_len > size - sizeof(*rsp))
498 *ibuf_len = size - sizeof(*rsp);
338a1281
OP		 499
500 memcpy(ibuf, rsp + 1, *ibuf_len);
501
502out_free_rx_slot:
503 free_rx_slot(dln2, handle, rx_slot);
504out_decr:
505 spin_lock(&dln2->disconnect_lock);
506 dln2->active_transfers--;
507 spin_unlock(&dln2->disconnect_lock);
508 if (dln2->disconnect)
509 wake_up(&dln2->disconnect_wq);
510
511 return ret;
512}
513
514int dln2_transfer(struct platform_device *pdev, u16 cmd,
515 const void *obuf, unsigned obuf_len,
516 void *ibuf, unsigned *ibuf_len)
517{
518 struct dln2_platform_data *dln2_pdata;
519 struct dln2_dev *dln2;
520 u16 handle;
521
522 dln2 = dev_get_drvdata(pdev->dev.parent);
523 dln2_pdata = dev_get_platdata(&pdev->dev);
524 handle = dln2_pdata->handle;
525
526 return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf,
527 ibuf_len);
528}
529EXPORT_SYMBOL(dln2_transfer);
530
531static int dln2_check_hw(struct dln2_dev *dln2)
532{
533 int ret;
534 __le32 hw_type;
535 int len = sizeof(hw_type);
536
537 ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER,
538 NULL, 0, &hw_type, &len);
539 if (ret < 0)
540 return ret;
541 if (len < sizeof(hw_type))
542 return -EREMOTEIO;
543
544 if (le32_to_cpu(hw_type) != DLN2_HW_ID) {
545 dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n",
546 le32_to_cpu(hw_type));
547 return -ENODEV;
548 }
549
550 return 0;
551}
552
553static int dln2_print_serialno(struct dln2_dev *dln2)
554{
555 int ret;
556 __le32 serial_no;
557 int len = sizeof(serial_no);
558 struct device *dev = &dln2->interface->dev;
559
560 ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0,
561 &serial_no, &len);
562 if (ret < 0)
563 return ret;
564 if (len < sizeof(serial_no))
565 return -EREMOTEIO;
566
567 dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no));
568
569 return 0;
570}
571
572static int dln2_hw_init(struct dln2_dev *dln2)
573{
574 int ret;
575
576 ret = dln2_check_hw(dln2);
577 if (ret < 0)
578 return ret;
579
580 return dln2_print_serialno(dln2);
581}
582
583static void dln2_free_rx_urbs(struct dln2_dev *dln2)
584{
585 int i;
586
587 for (i = 0; i < DLN2_MAX_URBS; i++) {
338a1281
OP		 588 usb_free_urb(dln2->rx_urb[i]);
589 kfree(dln2->rx_buf[i]);
590 }
591}
592
ee231aee
OP		 593static void dln2_stop_rx_urbs(struct dln2_dev *dln2)
594{
595 int i;
596
597 for (i = 0; i < DLN2_MAX_URBS; i++)
598 usb_kill_urb(dln2->rx_urb[i]);
599}
600
338a1281
OP		 601static void dln2_free(struct dln2_dev *dln2)
602{
603 dln2_free_rx_urbs(dln2);
604 usb_put_dev(dln2->usb_dev);
605 kfree(dln2);
606}
607
608static int dln2_setup_rx_urbs(struct dln2_dev *dln2,
609 struct usb_host_interface *hostif)
610{
611 int i;
338a1281 612 const int rx_max_size = DLN2_RX_BUF_SIZE;
338a1281
OP		 613
614 for (i = 0; i < DLN2_MAX_URBS; i++) {
615 dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL);
616 if (!dln2->rx_buf[i])
617 return -ENOMEM;
618
619 dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
620 if (!dln2->rx_urb[i])
621 return -ENOMEM;
622
623 usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev,
624 usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in),
625 dln2->rx_buf[i], rx_max_size, dln2_rx, dln2);
ee231aee
OP		 626 }
627
628 return 0;
629}
338a1281 630
ee231aee
OP		 631static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp)
632{
633 struct device *dev = &dln2->interface->dev;
634 int ret;
635 int i;
636
637 for (i = 0; i < DLN2_MAX_URBS; i++) {
638 ret = usb_submit_urb(dln2->rx_urb[i], gfp);
338a1281
OP		 639 if (ret < 0) {
640 dev_err(dev, "failed to submit RX URB: %d\n", ret);
641 return ret;
642 }
643 }
644
645 return 0;
646}
647
e3fadb35
AS		 648enum {
649 DLN2_ACPI_MATCH_GPIO = 0,
650 DLN2_ACPI_MATCH_I2C = 1,
651 DLN2_ACPI_MATCH_SPI = 2,
313c84b5 652 DLN2_ACPI_MATCH_ADC = 3,
e3fadb35
AS		 653};
654
338a1281
OP		 655static struct dln2_platform_data dln2_pdata_gpio = {
656 .handle = DLN2_HANDLE_GPIO,
657};
658
e3fadb35
AS		 659static struct mfd_cell_acpi_match dln2_acpi_match_gpio = {
660 .adr = DLN2_ACPI_MATCH_GPIO,
661};
662
338a1281
OP		 663/* Only one I2C port seems to be supported on current hardware */
664static struct dln2_platform_data dln2_pdata_i2c = {
665 .handle = DLN2_HANDLE_I2C,
666 .port = 0,
667};
668
e3fadb35
AS		 669static struct mfd_cell_acpi_match dln2_acpi_match_i2c = {
670 .adr = DLN2_ACPI_MATCH_I2C,
671};
672
21cf3318
LP		 673/* Only one SPI port supported */
674static struct dln2_platform_data dln2_pdata_spi = {
675 .handle = DLN2_HANDLE_SPI,
676 .port = 0,
677};
678
e3fadb35
AS		 679static struct mfd_cell_acpi_match dln2_acpi_match_spi = {
680 .adr = DLN2_ACPI_MATCH_SPI,
681};
682
313c84b5
JA		 683/* Only one ADC port supported */
684static struct dln2_platform_data dln2_pdata_adc = {
685 .handle = DLN2_HANDLE_ADC,
686 .port = 0,
687};
688
689static struct mfd_cell_acpi_match dln2_acpi_match_adc = {
690 .adr = DLN2_ACPI_MATCH_ADC,
691};
692
338a1281
OP		 693static const struct mfd_cell dln2_devs[] = {
694 {
695 .name = "dln2-gpio",
e3fadb35 696 .acpi_match = &dln2_acpi_match_gpio,
338a1281
OP		 697 .platform_data = &dln2_pdata_gpio,
698 .pdata_size = sizeof(struct dln2_platform_data),
699 },
700 {
701 .name = "dln2-i2c",
e3fadb35 702 .acpi_match = &dln2_acpi_match_i2c,
338a1281
OP		 703 .platform_data = &dln2_pdata_i2c,
704 .pdata_size = sizeof(struct dln2_platform_data),
705 },
21cf3318
LP		 706 {
707 .name = "dln2-spi",
e3fadb35 708 .acpi_match = &dln2_acpi_match_spi,
21cf3318
LP		 709 .platform_data = &dln2_pdata_spi,
710 .pdata_size = sizeof(struct dln2_platform_data),
711 },
313c84b5
JA		 712 {
713 .name = "dln2-adc",
714 .acpi_match = &dln2_acpi_match_adc,
715 .platform_data = &dln2_pdata_adc,
716 .pdata_size = sizeof(struct dln2_platform_data),
717 },
338a1281
OP		 718};
719
ee231aee 720static void dln2_stop(struct dln2_dev *dln2)
338a1281 721{
338a1281
OP		 722 int i, j;
723
724 /* don't allow starting new transfers */
725 spin_lock(&dln2->disconnect_lock);
726 dln2->disconnect = true;
727 spin_unlock(&dln2->disconnect_lock);
728
729 /* cancel in progress transfers */
730 for (i = 0; i < DLN2_HANDLES; i++) {
731 struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i];
732 unsigned long flags;
733
734 spin_lock_irqsave(&rxs->lock, flags);
735
736 /* cancel all response waiters */
737 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) {
738 struct dln2_rx_context *rxc = &rxs->slots[j];
739
740 if (rxc->in_use)
741 complete(&rxc->done);
742 }
743
744 spin_unlock_irqrestore(&rxs->lock, flags);
745 }
746
747 /* wait for transfers to end */
748 wait_event(dln2->disconnect_wq, !dln2->active_transfers);
749
ee231aee
OP		 750 dln2_stop_rx_urbs(dln2);
751}
752
753static void dln2_disconnect(struct usb_interface *interface)
754{
755 struct dln2_dev *dln2 = usb_get_intfdata(interface);
756
757 dln2_stop(dln2);
758
338a1281
OP		 759 mfd_remove_devices(&interface->dev);
760
761 dln2_free(dln2);
762}
763
764static int dln2_probe(struct usb_interface *interface,
765 const struct usb_device_id *usb_id)
766{
767 struct usb_host_interface *hostif = interface->cur_altsetting;
2b8bd606
ON		 768 struct usb_endpoint_descriptor *epin;
769 struct usb_endpoint_descriptor *epout;
338a1281
OP		 770 struct device *dev = &interface->dev;
771 struct dln2_dev *dln2;
772 int ret;
773 int i, j;
774
99a7ec2f 775 if (hostif->desc.bInterfaceNumber != 0)
338a1281
OP		 776 return -ENODEV;
777
99a7ec2f
AS		 778 ret = usb_find_common_endpoints(hostif, &epin, &epout, NULL, NULL);
779 if (ret)
780 return ret;
2b8bd606 781
338a1281
OP		 782 dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL);
783 if (!dln2)
784 return -ENOMEM;
785
2b8bd606
ON		 786 dln2->ep_out = epout->bEndpointAddress;
787 dln2->ep_in = epin->bEndpointAddress;
338a1281
OP		 788 dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface));
789 dln2->interface = interface;
790 usb_set_intfdata(interface, dln2);
791 init_waitqueue_head(&dln2->disconnect_wq);
792
793 for (i = 0; i < DLN2_HANDLES; i++) {
794 init_waitqueue_head(&dln2->mod_rx_slots[i].wq);
795 spin_lock_init(&dln2->mod_rx_slots[i].lock);
796 for (j = 0; j < DLN2_MAX_RX_SLOTS; j++)
797 init_completion(&dln2->mod_rx_slots[i].slots[j].done);
798 }
799
800 spin_lock_init(&dln2->event_cb_lock);
801 spin_lock_init(&dln2->disconnect_lock);
802 INIT_LIST_HEAD(&dln2->event_cb_list);
803
804 ret = dln2_setup_rx_urbs(dln2, hostif);
805 if (ret)
ee231aee
OP		 806 goto out_free;
807
808 ret = dln2_start_rx_urbs(dln2, GFP_KERNEL);
809 if (ret)
810 goto out_stop_rx;
338a1281
OP		 811
812 ret = dln2_hw_init(dln2);
813 if (ret < 0) {
814 dev_err(dev, "failed to initialize hardware\n");
ee231aee 815 goto out_stop_rx;
338a1281
OP		 816 }
817
818 ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs));
819 if (ret != 0) {
820 dev_err(dev, "failed to add mfd devices to core\n");
ee231aee 821 goto out_stop_rx;
338a1281
OP		 822 }
823
824 return 0;
825
ee231aee
OP		 826out_stop_rx:
827 dln2_stop_rx_urbs(dln2);
828
829out_free:
338a1281
OP		 830 dln2_free(dln2);
831
832 return ret;
833}
834
3daa122d
OP		 835static int dln2_suspend(struct usb_interface *iface, pm_message_t message)
836{
837 struct dln2_dev *dln2 = usb_get_intfdata(iface);
838
839 dln2_stop(dln2);
840
841 return 0;
842}
843
844static int dln2_resume(struct usb_interface *iface)
845{
846 struct dln2_dev *dln2 = usb_get_intfdata(iface);
847
848 dln2->disconnect = false;
849
850 return dln2_start_rx_urbs(dln2, GFP_NOIO);
851}
852
338a1281
OP		 853static const struct usb_device_id dln2_table[] = {
854 { USB_DEVICE(0xa257, 0x2013) },
855 { }
856};
857
858MODULE_DEVICE_TABLE(usb, dln2_table);
859
860static struct usb_driver dln2_driver = {
861 .name = "dln2",
862 .probe = dln2_probe,
863 .disconnect = dln2_disconnect,
864 .id_table = dln2_table,
3daa122d
OP		 865 .suspend = dln2_suspend,
866 .resume = dln2_resume,
338a1281
OP		 867};
868
869module_usb_driver(dln2_driver);
870
871MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
872MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter");
873MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)