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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Intel La Jolla Cove Adapter USB driver
4 *
5 * Copyright (c) 2023, Intel Corporation.
6 */
7
8#include <linux/acpi.h>
9#include <linux/auxiliary_bus.h>
10#include <linux/dev_printk.h>
11#include <linux/kernel.h>
12#include <linux/mod_devicetable.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
15#include <linux/slab.h>
16#include <linux/spinlock.h>
17#include <linux/types.h>
18#include <linux/usb.h>
19#include <linux/usb/ljca.h>
20
21#include <asm/unaligned.h>
22
23/* command flags */
24#define LJCA_ACK_FLAG BIT(0)
25#define LJCA_RESP_FLAG BIT(1)
26#define LJCA_CMPL_FLAG BIT(2)
27
28#define LJCA_MAX_PACKET_SIZE 64u
29#define LJCA_MAX_PAYLOAD_SIZE \
30 (LJCA_MAX_PACKET_SIZE - sizeof(struct ljca_msg))
31
32#define LJCA_WRITE_TIMEOUT_MS 200
33#define LJCA_WRITE_ACK_TIMEOUT_MS 500
34#define LJCA_ENUM_CLIENT_TIMEOUT_MS 20
35
36/* ljca client type */
37enum ljca_client_type {
38 LJCA_CLIENT_MNG = 1,
39 LJCA_CLIENT_GPIO = 3,
40 LJCA_CLIENT_I2C = 4,
41 LJCA_CLIENT_SPI = 5,
42};
43
44/* MNG client commands */
45enum ljca_mng_cmd {
46 LJCA_MNG_RESET = 2,
47 LJCA_MNG_ENUM_GPIO = 4,
48 LJCA_MNG_ENUM_I2C = 5,
49 LJCA_MNG_ENUM_SPI = 8,
50};
51
52/* ljca client acpi _ADR */
53enum ljca_client_acpi_adr {
54 LJCA_GPIO_ACPI_ADR,
55 LJCA_I2C1_ACPI_ADR,
56 LJCA_I2C2_ACPI_ADR,
57 LJCA_SPI1_ACPI_ADR,
58 LJCA_SPI2_ACPI_ADR,
59 LJCA_CLIENT_ACPI_ADR_MAX,
60};
61
62/* ljca cmd message structure */
63struct ljca_msg {
64 u8 type;
65 u8 cmd;
66 u8 flags;
67 u8 len;
68 u8 data[] __counted_by(len);
69} __packed;
70
71struct ljca_i2c_ctr_info {
72 u8 id;
73 u8 capacity;
74 u8 intr_pin;
75} __packed;
76
77struct ljca_i2c_descriptor {
78 u8 num;
79 struct ljca_i2c_ctr_info info[] __counted_by(num);
80} __packed;
81
82struct ljca_spi_ctr_info {
83 u8 id;
84 u8 capacity;
85 u8 intr_pin;
86} __packed;
87
88struct ljca_spi_descriptor {
89 u8 num;
90 struct ljca_spi_ctr_info info[] __counted_by(num);
91} __packed;
92
93struct ljca_bank_descriptor {
94 u8 bank_id;
95 u8 pin_num;
96
97 /* 1 bit for each gpio, 1 means valid */
98 __le32 valid_pins;
99} __packed;
100
101struct ljca_gpio_descriptor {
102 u8 pins_per_bank;
103 u8 bank_num;
104 struct ljca_bank_descriptor bank_desc[] __counted_by(bank_num);
105} __packed;
106
107/**
108 * struct ljca_adapter - represent a ljca adapter
109 *
110 * @intf: the usb interface for this ljca adapter
111 * @usb_dev: the usb device for this ljca adapter
112 * @dev: the specific device info of the usb interface
113 * @rx_pipe: bulk in pipe for receive data from firmware
114 * @tx_pipe: bulk out pipe for send data to firmware
115 * @rx_urb: urb used for the bulk in pipe
116 * @rx_buf: buffer used to receive command response and event
117 * @rx_len: length of rx buffer
118 * @ex_buf: external buffer to save command response
119 * @ex_buf_len: length of external buffer
120 * @actual_length: actual length of data copied to external buffer
121 * @tx_buf: buffer used to download command to firmware
122 * @tx_buf_len: length of tx buffer
123 * @lock: spinlock to protect tx_buf and ex_buf
124 * @cmd_completion: completion object as the command receives ack
125 * @mutex: mutex to avoid command download concurrently
126 * @client_list: client device list
127 * @disconnect: usb disconnect ongoing or not
128 * @reset_id: used to reset firmware
129 */
130struct ljca_adapter {
131 struct usb_interface *intf;
132 struct usb_device *usb_dev;
133 struct device *dev;
134
135 unsigned int rx_pipe;
136 unsigned int tx_pipe;
137
138 struct urb *rx_urb;
139 void *rx_buf;
140 unsigned int rx_len;
141
142 u8 *ex_buf;
143 u8 ex_buf_len;
144 u8 actual_length;
145
146 void *tx_buf;
147 u8 tx_buf_len;
148
149 spinlock_t lock;
150
151 struct completion cmd_completion;
152 struct mutex mutex;
153
154 struct list_head client_list;
155
156 bool disconnect;
157
158 u32 reset_id;
159};
160
161struct ljca_match_ids_walk_data {
162 const struct acpi_device_id *ids;
163 const char *uid;
164 struct acpi_device *adev;
165};
166
167static const struct acpi_device_id ljca_gpio_hids[] = {
168 { "INTC1074" },
169 { "INTC1096" },
170 { "INTC100B" },
171 { "INTC10D1" },
172 {},
173};
174
175static const struct acpi_device_id ljca_i2c_hids[] = {
176 { "INTC1075" },
177 { "INTC1097" },
178 { "INTC100C" },
179 { "INTC10D2" },
180 {},
181};
182
183static const struct acpi_device_id ljca_spi_hids[] = {
184 { "INTC1091" },
185 { "INTC1098" },
186 { "INTC100D" },
187 { "INTC10D3" },
188 {},
189};
190
191static void ljca_handle_event(struct ljca_adapter *adap,
192 struct ljca_msg *header)
193{
194 struct ljca_client *client;
195
196 list_for_each_entry(client, &adap->client_list, link) {
197 /*
198 * Currently only GPIO register event callback, but
199 * firmware message structure should include id when
200 * multiple same type clients register event callback.
201 */
202 if (client->type == header->type) {
203 unsigned long flags;
204
205 spin_lock_irqsave(&client->event_cb_lock, flags);
206 client->event_cb(client->context, header->cmd,
207 header->data, header->len);
208 spin_unlock_irqrestore(&client->event_cb_lock, flags);
209
210 break;
211 }
212 }
213}
214
215/* process command ack and received data if available */
216static void ljca_handle_cmd_ack(struct ljca_adapter *adap, struct ljca_msg *header)
217{
218 struct ljca_msg *tx_header = adap->tx_buf;
219 u8 ibuf_len, actual_len = 0;
220 unsigned long flags;
221 u8 *ibuf;
222
223 spin_lock_irqsave(&adap->lock, flags);
224
225 if (tx_header->type != header->type || tx_header->cmd != header->cmd) {
226 spin_unlock_irqrestore(&adap->lock, flags);
227 dev_err(adap->dev, "cmd ack mismatch error\n");
228 return;
229 }
230
231 ibuf_len = adap->ex_buf_len;
232 ibuf = adap->ex_buf;
233
234 if (ibuf && ibuf_len) {
235 actual_len = min(header->len, ibuf_len);
236
237 /* copy received data to external buffer */
238 memcpy(ibuf, header->data, actual_len);
239 }
240 /* update copied data length */
241 adap->actual_length = actual_len;
242
243 spin_unlock_irqrestore(&adap->lock, flags);
244
245 complete(&adap->cmd_completion);
246}
247
248static void ljca_recv(struct urb *urb)
249{
250 struct ljca_msg *header = urb->transfer_buffer;
251 struct ljca_adapter *adap = urb->context;
252 int ret;
253
254 switch (urb->status) {
255 case 0:
256 /* success */
257 break;
258 case -ENOENT:
259 /*
260 * directly complete the possible ongoing transfer
261 * during disconnect
262 */
263 if (adap->disconnect)
264 complete(&adap->cmd_completion);
265 return;
266 case -ECONNRESET:
267 case -ESHUTDOWN:
268 case -EPIPE:
269 /* rx urb is terminated */
270 dev_dbg(adap->dev, "rx urb terminated with status: %d\n",
271 urb->status);
272 return;
273 default:
274 dev_dbg(adap->dev, "rx urb error: %d\n", urb->status);
275 goto resubmit;
276 }
277
278 if (header->len + sizeof(*header) != urb->actual_length)
279 goto resubmit;
280
281 if (header->flags & LJCA_ACK_FLAG)
282 ljca_handle_cmd_ack(adap, header);
283 else
284 ljca_handle_event(adap, header);
285
286resubmit:
287 ret = usb_submit_urb(urb, GFP_ATOMIC);
288 if (ret && ret != -EPERM)
289 dev_err(adap->dev, "resubmit rx urb error %d\n", ret);
290}
291
292static int ljca_send(struct ljca_adapter *adap, u8 type, u8 cmd,
293 const u8 *obuf, u8 obuf_len, u8 *ibuf, u8 ibuf_len,
294 bool ack, unsigned long timeout)
295{
296 unsigned int msg_len = sizeof(struct ljca_msg) + obuf_len;
297 struct ljca_msg *header = adap->tx_buf;
298 unsigned int transferred;
299 unsigned long flags;
300 int ret;
301
302 if (adap->disconnect)
303 return -ENODEV;
304
305 if (msg_len > adap->tx_buf_len)
306 return -EINVAL;
307
308 mutex_lock(&adap->mutex);
309
310 spin_lock_irqsave(&adap->lock, flags);
311
312 header->type = type;
313 header->cmd = cmd;
314 header->len = obuf_len;
315 if (obuf)
316 memcpy(header->data, obuf, obuf_len);
317
318 header->flags = LJCA_CMPL_FLAG | (ack ? LJCA_ACK_FLAG : 0);
319
320 adap->ex_buf = ibuf;
321 adap->ex_buf_len = ibuf_len;
322 adap->actual_length = 0;
323
324 spin_unlock_irqrestore(&adap->lock, flags);
325
326 reinit_completion(&adap->cmd_completion);
327
328 ret = usb_autopm_get_interface(adap->intf);
329 if (ret < 0)
330 goto out;
331
332 ret = usb_bulk_msg(adap->usb_dev, adap->tx_pipe, header,
333 msg_len, &transferred, LJCA_WRITE_TIMEOUT_MS);
334
335 usb_autopm_put_interface(adap->intf);
336
337 if (ret < 0)
338 goto out;
339 if (transferred != msg_len) {
340 ret = -EIO;
341 goto out;
342 }
343
344 if (ack) {
345 ret = wait_for_completion_timeout(&adap->cmd_completion,
346 timeout);
347 if (!ret) {
348 ret = -ETIMEDOUT;
349 goto out;
350 }
351 }
352 ret = adap->actual_length;
353
354out:
355 spin_lock_irqsave(&adap->lock, flags);
356 adap->ex_buf = NULL;
357 adap->ex_buf_len = 0;
358
359 memset(header, 0, sizeof(*header));
360 spin_unlock_irqrestore(&adap->lock, flags);
361
362 mutex_unlock(&adap->mutex);
363
364 return ret;
365}
366
367int ljca_transfer(struct ljca_client *client, u8 cmd, const u8 *obuf,
368 u8 obuf_len, u8 *ibuf, u8 ibuf_len)
369{
370 return ljca_send(client->adapter, client->type, cmd,
371 obuf, obuf_len, ibuf, ibuf_len, true,
372 LJCA_WRITE_ACK_TIMEOUT_MS);
373}
374EXPORT_SYMBOL_NS_GPL(ljca_transfer, LJCA);
375
376int ljca_transfer_noack(struct ljca_client *client, u8 cmd, const u8 *obuf,
377 u8 obuf_len)
378{
379 return ljca_send(client->adapter, client->type, cmd, obuf,
380 obuf_len, NULL, 0, false, LJCA_WRITE_ACK_TIMEOUT_MS);
381}
382EXPORT_SYMBOL_NS_GPL(ljca_transfer_noack, LJCA);
383
384int ljca_register_event_cb(struct ljca_client *client, ljca_event_cb_t event_cb,
385 void *context)
386{
387 unsigned long flags;
388
389 if (!event_cb)
390 return -EINVAL;
391
392 spin_lock_irqsave(&client->event_cb_lock, flags);
393
394 if (client->event_cb) {
395 spin_unlock_irqrestore(&client->event_cb_lock, flags);
396 return -EALREADY;
397 }
398
399 client->event_cb = event_cb;
400 client->context = context;
401
402 spin_unlock_irqrestore(&client->event_cb_lock, flags);
403
404 return 0;
405}
406EXPORT_SYMBOL_NS_GPL(ljca_register_event_cb, LJCA);
407
408void ljca_unregister_event_cb(struct ljca_client *client)
409{
410 unsigned long flags;
411
412 spin_lock_irqsave(&client->event_cb_lock, flags);
413
414 client->event_cb = NULL;
415 client->context = NULL;
416
417 spin_unlock_irqrestore(&client->event_cb_lock, flags);
418}
419EXPORT_SYMBOL_NS_GPL(ljca_unregister_event_cb, LJCA);
420
421static int ljca_match_device_ids(struct acpi_device *adev, void *data)
422{
423 struct ljca_match_ids_walk_data *wd = data;
424 const char *uid = acpi_device_uid(adev);
425
426 if (acpi_match_device_ids(adev, wd->ids))
427 return 0;
428
429 if (!wd->uid)
430 goto match;
431
432 if (!uid)
433 /*
434 * Some DSDTs have only one ACPI companion for the two I2C
435 * controllers and they don't set a UID at all (e.g. Dell
436 * Latitude 9420). On these platforms only the first I2C
437 * controller is used, so if a HID match has no UID we use
438 * "0" as the UID and assign ACPI companion to the first
439 * I2C controller.
440 */
441 uid = "0";
442 else
443 uid = strchr(uid, wd->uid[0]);
444
445 if (!uid || strcmp(uid, wd->uid))
446 return 0;
447
448match:
449 wd->adev = adev;
450
451 return 1;
452}
453
454/* bind auxiliary device to acpi device */
455static void ljca_auxdev_acpi_bind(struct ljca_adapter *adap,
456 struct auxiliary_device *auxdev,
457 u64 adr, u8 id)
458{
459 struct ljca_match_ids_walk_data wd = { 0 };
460 struct device *dev = adap->dev;
461 struct acpi_device *parent;
462 char uid[4];
463
464 parent = ACPI_COMPANION(dev);
465 if (!parent)
466 return;
467
468 /*
469 * Currently LJCA hw doesn't use _ADR instead the shipped
470 * platforms use _HID to distinguish children devices.
471 */
472 switch (adr) {
473 case LJCA_GPIO_ACPI_ADR:
474 wd.ids = ljca_gpio_hids;
475 break;
476 case LJCA_I2C1_ACPI_ADR:
477 case LJCA_I2C2_ACPI_ADR:
478 snprintf(uid, sizeof(uid), "%d", id);
479 wd.uid = uid;
480 wd.ids = ljca_i2c_hids;
481 break;
482 case LJCA_SPI1_ACPI_ADR:
483 case LJCA_SPI2_ACPI_ADR:
484 wd.ids = ljca_spi_hids;
485 break;
486 default:
487 dev_warn(dev, "unsupported _ADR\n");
488 return;
489 }
490
491 acpi_dev_for_each_child(parent, ljca_match_device_ids, &wd);
492 if (wd.adev) {
493 ACPI_COMPANION_SET(&auxdev->dev, wd.adev);
494 return;
495 }
496
497 parent = ACPI_COMPANION(dev->parent->parent);
498 if (!parent)
499 return;
500
501 acpi_dev_for_each_child(parent, ljca_match_device_ids, &wd);
502 if (wd.adev)
503 ACPI_COMPANION_SET(&auxdev->dev, wd.adev);
504}
505
506static void ljca_auxdev_release(struct device *dev)
507{
508 struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
509
510 kfree(auxdev->dev.platform_data);
511}
512
513static int ljca_new_client_device(struct ljca_adapter *adap, u8 type, u8 id,
514 char *name, void *data, u64 adr)
515{
516 struct auxiliary_device *auxdev;
517 struct ljca_client *client;
518 int ret;
519
520 client = kzalloc(sizeof *client, GFP_KERNEL);
521 if (!client)
522 return -ENOMEM;
523
524 client->type = type;
525 client->id = id;
526 client->adapter = adap;
527 spin_lock_init(&client->event_cb_lock);
528
529 auxdev = &client->auxdev;
530 auxdev->name = name;
531 auxdev->id = id;
532
533 auxdev->dev.parent = adap->dev;
534 auxdev->dev.platform_data = data;
535 auxdev->dev.release = ljca_auxdev_release;
536
537 ret = auxiliary_device_init(auxdev);
538 if (ret)
539 goto err_free;
540
541 ljca_auxdev_acpi_bind(adap, auxdev, adr, id);
542
543 ret = auxiliary_device_add(auxdev);
544 if (ret)
545 goto err_uninit;
546
547 list_add_tail(&client->link, &adap->client_list);
548
549 return 0;
550
551err_uninit:
552 auxiliary_device_uninit(auxdev);
553
554err_free:
555 kfree(client);
556
557 return ret;
558}
559
560static int ljca_enumerate_gpio(struct ljca_adapter *adap)
561{
562 u32 valid_pin[LJCA_MAX_GPIO_NUM / BITS_PER_TYPE(u32)];
563 struct ljca_gpio_descriptor *desc;
564 struct ljca_gpio_info *gpio_info;
565 u8 buf[LJCA_MAX_PAYLOAD_SIZE];
566 int ret, gpio_num;
567 unsigned int i;
568
569 ret = ljca_send(adap, LJCA_CLIENT_MNG, LJCA_MNG_ENUM_GPIO, NULL, 0, buf,
570 sizeof(buf), true, LJCA_ENUM_CLIENT_TIMEOUT_MS);
571 if (ret < 0)
572 return ret;
573
574 /* check firmware response */
575 desc = (struct ljca_gpio_descriptor *)buf;
576 if (ret != struct_size(desc, bank_desc, desc->bank_num))
577 return -EINVAL;
578
579 gpio_num = desc->pins_per_bank * desc->bank_num;
580 if (gpio_num > LJCA_MAX_GPIO_NUM)
581 return -EINVAL;
582
583 /* construct platform data */
584 gpio_info = kzalloc(sizeof *gpio_info, GFP_KERNEL);
585 if (!gpio_info)
586 return -ENOMEM;
587 gpio_info->num = gpio_num;
588
589 for (i = 0; i < desc->bank_num; i++)
590 valid_pin[i] = get_unaligned_le32(&desc->bank_desc[i].valid_pins);
591 bitmap_from_arr32(gpio_info->valid_pin_map, valid_pin, gpio_num);
592
593 ret = ljca_new_client_device(adap, LJCA_CLIENT_GPIO, 0, "ljca-gpio",
594 gpio_info, LJCA_GPIO_ACPI_ADR);
595 if (ret)
596 kfree(gpio_info);
597
598 return ret;
599}
600
601static int ljca_enumerate_i2c(struct ljca_adapter *adap)
602{
603 struct ljca_i2c_descriptor *desc;
604 struct ljca_i2c_info *i2c_info;
605 u8 buf[LJCA_MAX_PAYLOAD_SIZE];
606 unsigned int i;
607 int ret;
608
609 ret = ljca_send(adap, LJCA_CLIENT_MNG, LJCA_MNG_ENUM_I2C, NULL, 0, buf,
610 sizeof(buf), true, LJCA_ENUM_CLIENT_TIMEOUT_MS);
611 if (ret < 0)
612 return ret;
613
614 /* check firmware response */
615 desc = (struct ljca_i2c_descriptor *)buf;
616 if (ret != struct_size(desc, info, desc->num))
617 return -EINVAL;
618
619 for (i = 0; i < desc->num; i++) {
620 /* construct platform data */
621 i2c_info = kzalloc(sizeof *i2c_info, GFP_KERNEL);
622 if (!i2c_info)
623 return -ENOMEM;
624
625 i2c_info->id = desc->info[i].id;
626 i2c_info->capacity = desc->info[i].capacity;
627 i2c_info->intr_pin = desc->info[i].intr_pin;
628
629 ret = ljca_new_client_device(adap, LJCA_CLIENT_I2C, i,
630 "ljca-i2c", i2c_info,
631 LJCA_I2C1_ACPI_ADR + i);
632 if (ret) {
633 kfree(i2c_info);
634 return ret;
635 }
636 }
637
638 return 0;
639}
640
641static int ljca_enumerate_spi(struct ljca_adapter *adap)
642{
643 struct ljca_spi_descriptor *desc;
644 struct ljca_spi_info *spi_info;
645 u8 buf[LJCA_MAX_PAYLOAD_SIZE];
646 unsigned int i;
647 int ret;
648
649 /* Not all LJCA chips implement SPI, a timeout reading the descriptors is normal */
650 ret = ljca_send(adap, LJCA_CLIENT_MNG, LJCA_MNG_ENUM_SPI, NULL, 0, buf,
651 sizeof(buf), true, LJCA_ENUM_CLIENT_TIMEOUT_MS);
652 if (ret < 0)
653 return (ret == -ETIMEDOUT) ? 0 : ret;
654
655 /* check firmware response */
656 desc = (struct ljca_spi_descriptor *)buf;
657 if (ret != struct_size(desc, info, desc->num))
658 return -EINVAL;
659
660 for (i = 0; i < desc->num; i++) {
661 /* construct platform data */
662 spi_info = kzalloc(sizeof *spi_info, GFP_KERNEL);
663 if (!spi_info)
664 return -ENOMEM;
665
666 spi_info->id = desc->info[i].id;
667 spi_info->capacity = desc->info[i].capacity;
668
669 ret = ljca_new_client_device(adap, LJCA_CLIENT_SPI, i,
670 "ljca-spi", spi_info,
671 LJCA_SPI1_ACPI_ADR + i);
672 if (ret) {
673 kfree(spi_info);
674 return ret;
675 }
676 }
677
678 return 0;
679}
680
681static int ljca_reset_handshake(struct ljca_adapter *adap)
682{
683 __le32 reset_id = cpu_to_le32(adap->reset_id);
684 __le32 reset_id_ret = 0;
685 int ret;
686
687 adap->reset_id++;
688
689 ret = ljca_send(adap, LJCA_CLIENT_MNG, LJCA_MNG_RESET, (u8 *)&reset_id,
690 sizeof(__le32), (u8 *)&reset_id_ret, sizeof(__le32),
691 true, LJCA_WRITE_ACK_TIMEOUT_MS);
692 if (ret < 0)
693 return ret;
694
695 if (reset_id_ret != reset_id)
696 return -EINVAL;
697
698 return 0;
699}
700
701static int ljca_enumerate_clients(struct ljca_adapter *adap)
702{
703 struct ljca_client *client, *next;
704 int ret;
705
706 ret = ljca_reset_handshake(adap);
707 if (ret)
708 goto err_kill;
709
710 ret = ljca_enumerate_gpio(adap);
711 if (ret) {
712 dev_err(adap->dev, "enumerate GPIO error\n");
713 goto err_kill;
714 }
715
716 ret = ljca_enumerate_i2c(adap);
717 if (ret) {
718 dev_err(adap->dev, "enumerate I2C error\n");
719 goto err_kill;
720 }
721
722 ret = ljca_enumerate_spi(adap);
723 if (ret) {
724 dev_err(adap->dev, "enumerate SPI error\n");
725 goto err_kill;
726 }
727
728 return 0;
729
730err_kill:
731 adap->disconnect = true;
732
733 usb_kill_urb(adap->rx_urb);
734
735 list_for_each_entry_safe_reverse(client, next, &adap->client_list, link) {
736 auxiliary_device_delete(&client->auxdev);
737 auxiliary_device_uninit(&client->auxdev);
738
739 list_del_init(&client->link);
740 kfree(client);
741 }
742
743 return ret;
744}
745
746static int ljca_probe(struct usb_interface *interface,
747 const struct usb_device_id *id)
748{
749 struct usb_device *usb_dev = interface_to_usbdev(interface);
750 struct usb_host_interface *alt = interface->cur_altsetting;
751 struct usb_endpoint_descriptor *ep_in, *ep_out;
752 struct device *dev = &interface->dev;
753 struct ljca_adapter *adap;
754 int ret;
755
756 adap = devm_kzalloc(dev, sizeof(*adap), GFP_KERNEL);
757 if (!adap)
758 return -ENOMEM;
759
760 /* separate tx buffer allocation for alignment */
761 adap->tx_buf = devm_kzalloc(dev, LJCA_MAX_PACKET_SIZE, GFP_KERNEL);
762 if (!adap->tx_buf)
763 return -ENOMEM;
764 adap->tx_buf_len = LJCA_MAX_PACKET_SIZE;
765
766 mutex_init(&adap->mutex);
767 spin_lock_init(&adap->lock);
768 init_completion(&adap->cmd_completion);
769 INIT_LIST_HEAD(&adap->client_list);
770
771 adap->intf = usb_get_intf(interface);
772 adap->usb_dev = usb_dev;
773 adap->dev = dev;
774
775 /*
776 * find the first bulk in and out endpoints.
777 * ignore any others.
778 */
779 ret = usb_find_common_endpoints(alt, &ep_in, &ep_out, NULL, NULL);
780 if (ret) {
781 dev_err(dev, "bulk endpoints not found\n");
782 goto err_put;
783 }
784 adap->rx_pipe = usb_rcvbulkpipe(usb_dev, usb_endpoint_num(ep_in));
785 adap->tx_pipe = usb_sndbulkpipe(usb_dev, usb_endpoint_num(ep_out));
786
787 /* setup rx buffer */
788 adap->rx_len = usb_endpoint_maxp(ep_in);
789 adap->rx_buf = devm_kzalloc(dev, adap->rx_len, GFP_KERNEL);
790 if (!adap->rx_buf) {
791 ret = -ENOMEM;
792 goto err_put;
793 }
794
795 /* alloc rx urb */
796 adap->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
797 if (!adap->rx_urb) {
798 ret = -ENOMEM;
799 goto err_put;
800 }
801 usb_fill_bulk_urb(adap->rx_urb, usb_dev, adap->rx_pipe,
802 adap->rx_buf, adap->rx_len, ljca_recv, adap);
803
804 usb_set_intfdata(interface, adap);
805
806 /* submit rx urb before enumerate clients */
807 ret = usb_submit_urb(adap->rx_urb, GFP_KERNEL);
808 if (ret) {
809 dev_err(dev, "submit rx urb failed: %d\n", ret);
810 goto err_free;
811 }
812
813 ret = ljca_enumerate_clients(adap);
814 if (ret)
815 goto err_free;
816
817 usb_enable_autosuspend(usb_dev);
818
819 return 0;
820
821err_free:
822 usb_free_urb(adap->rx_urb);
823
824err_put:
825 usb_put_intf(adap->intf);
826
827 mutex_destroy(&adap->mutex);
828
829 return ret;
830}
831
832static void ljca_disconnect(struct usb_interface *interface)
833{
834 struct ljca_adapter *adap = usb_get_intfdata(interface);
835 struct ljca_client *client, *next;
836
837 adap->disconnect = true;
838
839 usb_kill_urb(adap->rx_urb);
840
841 list_for_each_entry_safe_reverse(client, next, &adap->client_list, link) {
842 auxiliary_device_delete(&client->auxdev);
843 auxiliary_device_uninit(&client->auxdev);
844
845 list_del_init(&client->link);
846 kfree(client);
847 }
848
849 usb_free_urb(adap->rx_urb);
850
851 usb_put_intf(adap->intf);
852
853 mutex_destroy(&adap->mutex);
854}
855
856static int ljca_suspend(struct usb_interface *interface, pm_message_t message)
857{
858 struct ljca_adapter *adap = usb_get_intfdata(interface);
859
860 usb_kill_urb(adap->rx_urb);
861
862 return 0;
863}
864
865static int ljca_resume(struct usb_interface *interface)
866{
867 struct ljca_adapter *adap = usb_get_intfdata(interface);
868
869 return usb_submit_urb(adap->rx_urb, GFP_KERNEL);
870}
871
872static const struct usb_device_id ljca_table[] = {
873 { USB_DEVICE(0x8086, 0x0b63) },
874 { /* sentinel */ }
875};
876MODULE_DEVICE_TABLE(usb, ljca_table);
877
878static struct usb_driver ljca_driver = {
879 .name = "ljca",
880 .id_table = ljca_table,
881 .probe = ljca_probe,
882 .disconnect = ljca_disconnect,
883 .suspend = ljca_suspend,
884 .resume = ljca_resume,
885 .supports_autosuspend = 1,
886};
887module_usb_driver(ljca_driver);
888
889MODULE_AUTHOR("Wentong Wu <wentong.wu@intel.com>");
890MODULE_AUTHOR("Zhifeng Wang <zhifeng.wang@intel.com>");
891MODULE_AUTHOR("Lixu Zhang <lixu.zhang@intel.com>");
892MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB driver");
893MODULE_LICENSE("GPL");