summaryrefslogtreecommitdiffstats
path: root/drivers/hid/intel-ish-hid/ishtp-hid-client.c
blob: 91bf4d01e91a7c0bcd36cd6eb2e5a6fbe12181f4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
// SPDX-License-Identifier: GPL-2.0-only
/*
 * ISHTP client driver for HID (ISH)
 *
 * Copyright (c) 2014-2016, Intel Corporation.
 */

#include <linux/module.h>
#include <linux/hid.h>
#include <linux/intel-ish-client-if.h>
#include <linux/sched.h>
#include "ishtp-hid.h"

/* ISH Transport protocol (ISHTP in short) GUID */
static const guid_t hid_ishtp_guid =
	GUID_INIT(0x33AECD58, 0xB679, 0x4E54,
		  0x9B, 0xD9, 0xA0, 0x4D, 0x34, 0xF0, 0xC2, 0x26);

/* Rx ring buffer pool size */
#define HID_CL_RX_RING_SIZE	32
#define HID_CL_TX_RING_SIZE	16

#define cl_data_to_dev(client_data) ishtp_device(client_data->cl_device)

/**
 * report_bad_packet() - Report bad packets
 * @hid_ishtp_cl:	Client instance to get stats
 * @recv_buf:		Raw received host interface message
 * @cur_pos:		Current position index in payload
 * @payload_len:	Length of payload expected
 *
 * Dumps error in case bad packet is received
 */
static void report_bad_packet(struct ishtp_cl *hid_ishtp_cl, void *recv_buf,
			      size_t cur_pos,  size_t payload_len)
{
	struct hostif_msg *recv_msg = recv_buf;
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);

	dev_err(cl_data_to_dev(client_data), "[hid-ish]: BAD packet %02X\n"
		"total_bad=%u cur_pos=%u\n"
		"[%02X %02X %02X %02X]\n"
		"payload_len=%u\n"
		"multi_packet_cnt=%u\n"
		"is_response=%02X\n",
		recv_msg->hdr.command, client_data->bad_recv_cnt,
		(unsigned int)cur_pos,
		((unsigned char *)recv_msg)[0], ((unsigned char *)recv_msg)[1],
		((unsigned char *)recv_msg)[2], ((unsigned char *)recv_msg)[3],
		(unsigned int)payload_len, client_data->multi_packet_cnt,
		recv_msg->hdr.command & ~CMD_MASK);
}

/**
 * process_recv() - Received and parse incoming packet
 * @hid_ishtp_cl:	Client instance to get stats
 * @recv_buf:		Raw received host interface message
 * @data_len:		length of the message
 *
 * Parse the incoming packet. If it is a response packet then it will update
 * per instance flags and wake up the caller waiting to for the response.
 */
static void process_recv(struct ishtp_cl *hid_ishtp_cl, void *recv_buf,
			 size_t data_len)
{
	struct hostif_msg *recv_msg;
	unsigned char *payload;
	struct device_info *dev_info;
	int i, j;
	size_t	payload_len, total_len, cur_pos, raw_len;
	int report_type;
	struct report_list *reports_list;
	char *reports;
	size_t report_len;
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
	int curr_hid_dev = client_data->cur_hid_dev;
	struct ishtp_hid_data *hid_data = NULL;
	struct hid_device *hid = NULL;

	payload = recv_buf + sizeof(struct hostif_msg_hdr);
	total_len = data_len;
	cur_pos = 0;

	do {
		if (cur_pos + sizeof(struct hostif_msg) > total_len) {
			dev_err(cl_data_to_dev(client_data),
				"[hid-ish]: error, received %u which is less than data header %u\n",
				(unsigned int)data_len,
				(unsigned int)sizeof(struct hostif_msg_hdr));
			++client_data->bad_recv_cnt;
			ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
			break;
		}

		recv_msg = (struct hostif_msg *)(recv_buf + cur_pos);
		payload_len = recv_msg->hdr.size;

		/* Sanity checks */
		if (cur_pos + payload_len + sizeof(struct hostif_msg) >
				total_len) {
			++client_data->bad_recv_cnt;
			report_bad_packet(hid_ishtp_cl, recv_msg, cur_pos,
					  payload_len);
			ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
			break;
		}

		hid_ishtp_trace(client_data,  "%s %d\n",
				__func__, recv_msg->hdr.command & CMD_MASK);

		switch (recv_msg->hdr.command & CMD_MASK) {
		case HOSTIF_DM_ENUM_DEVICES:
			if ((!(recv_msg->hdr.command & ~CMD_MASK) ||
					client_data->init_done)) {
				++client_data->bad_recv_cnt;
				report_bad_packet(hid_ishtp_cl, recv_msg,
						  cur_pos,
						  payload_len);
				ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
				break;
			}
			client_data->hid_dev_count = (unsigned int)*payload;
			if (!client_data->hid_devices)
				client_data->hid_devices = devm_kcalloc(
						cl_data_to_dev(client_data),
						client_data->hid_dev_count,
						sizeof(struct device_info),
						GFP_KERNEL);
			if (!client_data->hid_devices) {
				dev_err(cl_data_to_dev(client_data),
				"Mem alloc failed for hid device info\n");
				wake_up_interruptible(&client_data->init_wait);
				break;
			}
			for (i = 0; i < client_data->hid_dev_count; ++i) {
				if (1 + sizeof(struct device_info) * i >=
						payload_len) {
					dev_err(cl_data_to_dev(client_data),
						"[hid-ish]: [ENUM_DEVICES]: content size %zu is bigger than payload_len %zu\n",
						1 + sizeof(struct device_info)
						* i, payload_len);
				}

				if (1 + sizeof(struct device_info) * i >=
						data_len)
					break;

				dev_info = (struct device_info *)(payload + 1 +
					sizeof(struct device_info) * i);
				if (client_data->hid_devices)
					memcpy(client_data->hid_devices + i,
					       dev_info,
					       sizeof(struct device_info));
			}

			client_data->enum_devices_done = true;
			wake_up_interruptible(&client_data->init_wait);

			break;

		case HOSTIF_GET_HID_DESCRIPTOR:
			if ((!(recv_msg->hdr.command & ~CMD_MASK) ||
					client_data->init_done)) {
				++client_data->bad_recv_cnt;
				report_bad_packet(hid_ishtp_cl, recv_msg,
						  cur_pos,
						  payload_len);
				ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
				break;
			}
			if (!client_data->hid_descr[curr_hid_dev])
				client_data->hid_descr[curr_hid_dev] =
				devm_kmalloc(cl_data_to_dev(client_data),
					     payload_len, GFP_KERNEL);
			if (client_data->hid_descr[curr_hid_dev]) {
				memcpy(client_data->hid_descr[curr_hid_dev],
				       payload, payload_len);
				client_data->hid_descr_size[curr_hid_dev] =
					payload_len;
				client_data->hid_descr_done = true;
			}
			wake_up_interruptible(&client_data->init_wait);

			break;

		case HOSTIF_GET_REPORT_DESCRIPTOR:
			if ((!(recv_msg->hdr.command & ~CMD_MASK) ||
					client_data->init_done)) {
				++client_data->bad_recv_cnt;
				report_bad_packet(hid_ishtp_cl, recv_msg,
						  cur_pos,
						  payload_len);
				ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
				break;
			}
			if (!client_data->report_descr[curr_hid_dev])
				client_data->report_descr[curr_hid_dev] =
				devm_kmalloc(cl_data_to_dev(client_data),
					     payload_len, GFP_KERNEL);
			if (client_data->report_descr[curr_hid_dev])  {
				memcpy(client_data->report_descr[curr_hid_dev],
				       payload,
				       payload_len);
				client_data->report_descr_size[curr_hid_dev] =
					payload_len;
				client_data->report_descr_done = true;
			}
			wake_up_interruptible(&client_data->init_wait);

			break;

		case HOSTIF_GET_FEATURE_REPORT:
			report_type = HID_FEATURE_REPORT;
			goto	do_get_report;

		case HOSTIF_GET_INPUT_REPORT:
			report_type = HID_INPUT_REPORT;
do_get_report:
			/* Get index of device that matches this id */
			for (i = 0; i < client_data->num_hid_devices; ++i) {
				if (recv_msg->hdr.device_id ==
					  client_data->hid_devices[i].dev_id) {
					hid = client_data->hid_sensor_hubs[i];
					if (!hid)
						break;

					hid_data = hid->driver_data;
					if (hid_data->raw_get_req) {
						raw_len =
						  (hid_data->raw_buf_size <
								payload_len) ?
						  hid_data->raw_buf_size :
						  payload_len;

						memcpy(hid_data->raw_buf,
						       payload, raw_len);
					} else {
						hid_input_report
							(hid, report_type,
							 payload, payload_len,
							 0);
					}

					ishtp_hid_wakeup(hid);
					break;
				}
			}
			break;

		case HOSTIF_SET_FEATURE_REPORT:
			/* Get index of device that matches this id */
			for (i = 0; i < client_data->num_hid_devices; ++i) {
				if (recv_msg->hdr.device_id ==
					client_data->hid_devices[i].dev_id)
					if (client_data->hid_sensor_hubs[i]) {
						ishtp_hid_wakeup(
						client_data->hid_sensor_hubs[
							i]);
						break;
					}
			}
			break;

		case HOSTIF_PUBLISH_INPUT_REPORT:
			report_type = HID_INPUT_REPORT;
			for (i = 0; i < client_data->num_hid_devices; ++i)
				if (recv_msg->hdr.device_id ==
					client_data->hid_devices[i].dev_id)
					if (client_data->hid_sensor_hubs[i])
						hid_input_report(
						client_data->hid_sensor_hubs[
									i],
						report_type, payload,
						payload_len, 0);
			break;

		case HOSTIF_PUBLISH_INPUT_REPORT_LIST:
			report_type = HID_INPUT_REPORT;
			reports_list = (struct report_list *)payload;
			reports = (char *)reports_list->reports;

			for (j = 0; j < reports_list->num_of_reports; j++) {
				recv_msg = (struct hostif_msg *)(reports +
					sizeof(uint16_t));
				report_len = *(uint16_t *)reports;
				payload = reports + sizeof(uint16_t) +
					sizeof(struct hostif_msg_hdr);
				payload_len = report_len -
					sizeof(struct hostif_msg_hdr);

				for (i = 0; i < client_data->num_hid_devices;
				     ++i)
					if (recv_msg->hdr.device_id ==
					client_data->hid_devices[i].dev_id &&
					client_data->hid_sensor_hubs[i]) {
						hid_input_report(
						client_data->hid_sensor_hubs[
									i],
						report_type,
						payload, payload_len,
						0);
					}

				reports += sizeof(uint16_t) + report_len;
			}
			break;
		default:
			++client_data->bad_recv_cnt;
			report_bad_packet(hid_ishtp_cl, recv_msg, cur_pos,
					  payload_len);
			ish_hw_reset(ishtp_get_ishtp_device(hid_ishtp_cl));
			break;

		}

		if (!cur_pos && cur_pos + payload_len +
				sizeof(struct hostif_msg) < total_len)
			++client_data->multi_packet_cnt;

		cur_pos += payload_len + sizeof(struct hostif_msg);
		payload += payload_len + sizeof(struct hostif_msg);

	} while (cur_pos < total_len);
}

/**
 * ish_cl_event_cb() - bus driver callback for incoming message/packet
 * @device:	Pointer to the the ishtp client device for which this message
 *		is targeted
 *
 * Remove the packet from the list and process the message by calling
 * process_recv
 */
static void ish_cl_event_cb(struct ishtp_cl_device *device)
{
	struct ishtp_cl	*hid_ishtp_cl = ishtp_get_drvdata(device);
	struct ishtp_cl_rb *rb_in_proc;
	size_t r_length;

	if (!hid_ishtp_cl)
		return;

	while ((rb_in_proc = ishtp_cl_rx_get_rb(hid_ishtp_cl)) != NULL) {
		if (!rb_in_proc->buffer.data)
			return;

		r_length = rb_in_proc->buf_idx;

		/* decide what to do with received data */
		process_recv(hid_ishtp_cl, rb_in_proc->buffer.data, r_length);

		ishtp_cl_io_rb_recycle(rb_in_proc);
	}
}

/**
 * hid_ishtp_set_feature() - send request to ISH FW to set a feature request
 * @hid:	hid device instance for this request
 * @buf:	feature buffer
 * @len:	Length of feature buffer
 * @report_id:	Report id for the feature set request
 *
 * This is called from hid core .request() callback. This function doesn't wait
 * for response.
 */
void hid_ishtp_set_feature(struct hid_device *hid, char *buf, unsigned int len,
			   int report_id)
{
	struct ishtp_hid_data *hid_data =  hid->driver_data;
	struct ishtp_cl_data *client_data = hid_data->client_data;
	struct hostif_msg *msg = (struct hostif_msg *)buf;
	int	rv;
	int	i;

	hid_ishtp_trace(client_data,  "%s hid %p\n", __func__, hid);

	rv = ishtp_hid_link_ready_wait(client_data);
	if (rv) {
		hid_ishtp_trace(client_data,  "%s hid %p link not ready\n",
				__func__, hid);
		return;
	}

	memset(msg, 0, sizeof(struct hostif_msg));
	msg->hdr.command = HOSTIF_SET_FEATURE_REPORT;
	for (i = 0; i < client_data->num_hid_devices; ++i) {
		if (hid == client_data->hid_sensor_hubs[i]) {
			msg->hdr.device_id =
				client_data->hid_devices[i].dev_id;
			break;
		}
	}

	if (i == client_data->num_hid_devices)
		return;

	rv = ishtp_cl_send(client_data->hid_ishtp_cl, buf, len);
	if (rv)
		hid_ishtp_trace(client_data,  "%s hid %p send failed\n",
				__func__, hid);
}

/**
 * hid_ishtp_get_report() - request to get feature/input report
 * @hid:	hid device instance for this request
 * @report_id:	Report id for the get request
 * @report_type:	Report type for the this request
 *
 * This is called from hid core .request() callback. This function will send
 * request to FW and return without waiting for response.
 */
void hid_ishtp_get_report(struct hid_device *hid, int report_id,
			  int report_type)
{
	struct ishtp_hid_data *hid_data =  hid->driver_data;
	struct ishtp_cl_data *client_data = hid_data->client_data;
	struct hostif_msg_to_sensor msg = {};
	int	rv;
	int	i;

	hid_ishtp_trace(client_data,  "%s hid %p\n", __func__, hid);
	rv = ishtp_hid_link_ready_wait(client_data);
	if (rv) {
		hid_ishtp_trace(client_data,  "%s hid %p link not ready\n",
				__func__, hid);
		return;
	}

	msg.hdr.command = (report_type == HID_FEATURE_REPORT) ?
		HOSTIF_GET_FEATURE_REPORT : HOSTIF_GET_INPUT_REPORT;
	for (i = 0; i < client_data->num_hid_devices; ++i) {
		if (hid == client_data->hid_sensor_hubs[i]) {
			msg.hdr.device_id =
				client_data->hid_devices[i].dev_id;
			break;
		}
	}

	if (i == client_data->num_hid_devices)
		return;

	msg.report_id = report_id;
	rv = ishtp_cl_send(client_data->hid_ishtp_cl, (uint8_t *)&msg,
			    sizeof(msg));
	if (rv)
		hid_ishtp_trace(client_data,  "%s hid %p send failed\n",
				__func__, hid);
}

/**
 * ishtp_hid_link_ready_wait() - Wait for link ready
 * @client_data:	client data instance
 *
 * If the transport link started suspend process, then wait, till either
 * resumed or timeout
 *
 * Return: 0 on success, non zero on error
 */
int ishtp_hid_link_ready_wait(struct ishtp_cl_data *client_data)
{
	int rc;

	if (client_data->suspended) {
		hid_ishtp_trace(client_data,  "wait for link ready\n");
		rc = wait_event_interruptible_timeout(
					client_data->ishtp_resume_wait,
					!client_data->suspended,
					5 * HZ);

		if (rc == 0) {
			hid_ishtp_trace(client_data,  "link not ready\n");
			return -EIO;
		}
		hid_ishtp_trace(client_data,  "link ready\n");
	}

	return 0;
}

/**
 * ishtp_enum_enum_devices() - Enumerate hid devices
 * @hid_ishtp_cl:	client instance
 *
 * Helper function to send request to firmware to enumerate HID devices
 *
 * Return: 0 on success, non zero on error
 */
static int ishtp_enum_enum_devices(struct ishtp_cl *hid_ishtp_cl)
{
	struct hostif_msg msg;
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
	int retry_count;
	int rv;

	/* Send HOSTIF_DM_ENUM_DEVICES */
	memset(&msg, 0, sizeof(struct hostif_msg));
	msg.hdr.command = HOSTIF_DM_ENUM_DEVICES;
	rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *)&msg,
			   sizeof(struct hostif_msg));
	if (rv)
		return rv;

	retry_count = 0;
	while (!client_data->enum_devices_done &&
	       retry_count < 10) {
		wait_event_interruptible_timeout(client_data->init_wait,
					 client_data->enum_devices_done,
					 3 * HZ);
		++retry_count;
		if (!client_data->enum_devices_done)
			/* Send HOSTIF_DM_ENUM_DEVICES */
			rv = ishtp_cl_send(hid_ishtp_cl,
					   (unsigned char *) &msg,
					   sizeof(struct hostif_msg));
	}
	if (!client_data->enum_devices_done) {
		dev_err(cl_data_to_dev(client_data),
			"[hid-ish]: timed out waiting for enum_devices\n");
		return -ETIMEDOUT;
	}
	if (!client_data->hid_devices) {
		dev_err(cl_data_to_dev(client_data),
			"[hid-ish]: failed to allocate HID dev structures\n");
		return -ENOMEM;
	}

	client_data->num_hid_devices = client_data->hid_dev_count;
	dev_info(ishtp_device(client_data->cl_device),
		"[hid-ish]: enum_devices_done OK, num_hid_devices=%d\n",
		client_data->num_hid_devices);

	return	0;
}

/**
 * ishtp_get_hid_descriptor() - Get hid descriptor
 * @hid_ishtp_cl:	client instance
 * @index:		Index into the hid_descr array
 *
 * Helper function to send request to firmware get HID descriptor of a device
 *
 * Return: 0 on success, non zero on error
 */
static int ishtp_get_hid_descriptor(struct ishtp_cl *hid_ishtp_cl, int index)
{
	struct hostif_msg msg;
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
	int rv;

	/* Get HID descriptor */
	client_data->hid_descr_done = false;
	memset(&msg, 0, sizeof(struct hostif_msg));
	msg.hdr.command = HOSTIF_GET_HID_DESCRIPTOR;
	msg.hdr.device_id = client_data->hid_devices[index].dev_id;
	rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *) &msg,
			   sizeof(struct hostif_msg));
	if (rv)
		return rv;

	if (!client_data->hid_descr_done) {
		wait_event_interruptible_timeout(client_data->init_wait,
						 client_data->hid_descr_done,
						 3 * HZ);
		if (!client_data->hid_descr_done) {
			dev_err(cl_data_to_dev(client_data),
				"[hid-ish]: timed out for hid_descr_done\n");
			return -EIO;
		}

		if (!client_data->hid_descr[index]) {
			dev_err(cl_data_to_dev(client_data),
				"[hid-ish]: allocation HID desc fail\n");
			return -ENOMEM;
		}
	}

	return 0;
}

/**
 * ishtp_get_report_descriptor() - Get report descriptor
 * @hid_ishtp_cl:	client instance
 * @index:		Index into the hid_descr array
 *
 * Helper function to send request to firmware get HID report descriptor of
 * a device
 *
 * Return: 0 on success, non zero on error
 */
static int ishtp_get_report_descriptor(struct ishtp_cl *hid_ishtp_cl,
				       int index)
{
	struct hostif_msg msg;
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
	int rv;

	/* Get report descriptor */
	client_data->report_descr_done = false;
	memset(&msg, 0, sizeof(struct hostif_msg));
	msg.hdr.command = HOSTIF_GET_REPORT_DESCRIPTOR;
	msg.hdr.device_id = client_data->hid_devices[index].dev_id;
	rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *) &msg,
			   sizeof(struct hostif_msg));
	if (rv)
		return rv;

	if (!client_data->report_descr_done)
		wait_event_interruptible_timeout(client_data->init_wait,
					 client_data->report_descr_done,
					 3 * HZ);
	if (!client_data->report_descr_done) {
		dev_err(cl_data_to_dev(client_data),
				"[hid-ish]: timed out for report descr\n");
		return -EIO;
	}
	if (!client_data->report_descr[index]) {
		dev_err(cl_data_to_dev(client_data),
			"[hid-ish]: failed to alloc report descr\n");
		return -ENOMEM;
	}

	return 0;
}

/**
 * hid_ishtp_cl_init() - Init function for ISHTP client
 * @hid_ishtp_cl:	ISHTP client instance
 * @reset:		true if called for init after reset
 *
 * This function complete the initializtion of the client. The summary of
 * processing:
 * - Send request to enumerate the hid clients
 *	Get the HID descriptor for each enumearated device
 *	Get report description of each device
 *	Register each device wik hid core by calling ishtp_hid_probe
 *
 * Return: 0 on success, non zero on error
 */
static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, int reset)
{
	struct ishtp_device *dev;
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
	struct ishtp_fw_client *fw_client;
	int i;
	int rv;

	dev_dbg(cl_data_to_dev(client_data), "%s\n", __func__);
	hid_ishtp_trace(client_data,  "%s reset flag: %d\n", __func__, reset);

	rv = ishtp_cl_link(hid_ishtp_cl);
	if (rv) {
		dev_err(cl_data_to_dev(client_data),
			"ishtp_cl_link failed\n");
		return	-ENOMEM;
	}

	client_data->init_done = 0;

	dev = ishtp_get_ishtp_device(hid_ishtp_cl);

	/* Connect to FW client */
	ishtp_set_tx_ring_size(hid_ishtp_cl, HID_CL_TX_RING_SIZE);
	ishtp_set_rx_ring_size(hid_ishtp_cl, HID_CL_RX_RING_SIZE);

	fw_client = ishtp_fw_cl_get_client(dev, &hid_ishtp_guid);
	if (!fw_client) {
		dev_err(cl_data_to_dev(client_data),
			"ish client uuid not found\n");
		return -ENOENT;
	}
	ishtp_cl_set_fw_client_id(hid_ishtp_cl,
				  ishtp_get_fw_client_id(fw_client));
	ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_CONNECTING);

	rv = ishtp_cl_connect(hid_ishtp_cl);
	if (rv) {
		dev_err(cl_data_to_dev(client_data),
			"client connect fail\n");
		goto err_cl_unlink;
	}

	hid_ishtp_trace(client_data,  "%s client connected\n", __func__);

	/* Register read callback */
	ishtp_register_event_cb(client_data->cl_device, ish_cl_event_cb);

	rv = ishtp_enum_enum_devices(hid_ishtp_cl);
	if (rv)
		goto err_cl_disconnect;

	hid_ishtp_trace(client_data,  "%s enumerated device count %d\n",
			__func__, client_data->num_hid_devices);

	for (i = 0; i < client_data->num_hid_devices; ++i) {
		client_data->cur_hid_dev = i;

		rv = ishtp_get_hid_descriptor(hid_ishtp_cl, i);
		if (rv)
			goto err_cl_disconnect;

		rv = ishtp_get_report_descriptor(hid_ishtp_cl, i);
		if (rv)
			goto err_cl_disconnect;

		if (!reset) {
			rv = ishtp_hid_probe(i, client_data);
			if (rv) {
				dev_err(cl_data_to_dev(client_data),
				"[hid-ish]: HID probe for #%u failed: %d\n",
				i, rv);
				goto err_cl_disconnect;
			}
		}
	} /* for() on all hid devices */

	client_data->init_done = 1;
	client_data->suspended = false;
	wake_up_interruptible(&client_data->ishtp_resume_wait);
	hid_ishtp_trace(client_data,  "%s successful init\n", __func__);
	return 0;

err_cl_disconnect:
	ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_DISCONNECTING);
	ishtp_cl_disconnect(hid_ishtp_cl);
err_cl_unlink:
	ishtp_cl_unlink(hid_ishtp_cl);
	return rv;
}

/**
 * hid_ishtp_cl_deinit() - Deinit function for ISHTP client
 * @hid_ishtp_cl:	ISHTP client instance
 *
 * Unlink and free hid client
 */
static void hid_ishtp_cl_deinit(struct ishtp_cl *hid_ishtp_cl)
{
	ishtp_cl_unlink(hid_ishtp_cl);
	ishtp_cl_flush_queues(hid_ishtp_cl);

	/* disband and free all Tx and Rx client-level rings */
	ishtp_cl_free(hid_ishtp_cl);
}

static void hid_ishtp_cl_reset_handler(struct work_struct *work)
{
	struct ishtp_cl_data *client_data;
	struct ishtp_cl *hid_ishtp_cl;
	struct ishtp_cl_device *cl_device;
	int retry;
	int rv;

	client_data = container_of(work, struct ishtp_cl_data, work);

	hid_ishtp_cl = client_data->hid_ishtp_cl;
	cl_device = client_data->cl_device;

	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
			hid_ishtp_cl);
	dev_dbg(ishtp_device(client_data->cl_device), "%s\n", __func__);

	hid_ishtp_cl_deinit(hid_ishtp_cl);

	hid_ishtp_cl = ishtp_cl_allocate(cl_device);
	if (!hid_ishtp_cl)
		return;

	ishtp_set_drvdata(cl_device, hid_ishtp_cl);
	ishtp_set_client_data(hid_ishtp_cl, client_data);
	client_data->hid_ishtp_cl = hid_ishtp_cl;

	client_data->num_hid_devices = 0;

	for (retry = 0; retry < 3; ++retry) {
		rv = hid_ishtp_cl_init(hid_ishtp_cl, 1);
		if (!rv)
			break;
		dev_err(cl_data_to_dev(client_data), "Retry reset init\n");
	}
	if (rv) {
		dev_err(cl_data_to_dev(client_data), "Reset Failed\n");
		hid_ishtp_trace(client_data, "%s Failed hid_ishtp_cl %p\n",
				__func__, hid_ishtp_cl);
	}
}

static void hid_ishtp_cl_resume_handler(struct work_struct *work)
{
	struct ishtp_cl_data *client_data = container_of(work, struct ishtp_cl_data, resume_work);
	struct ishtp_cl *hid_ishtp_cl = client_data->hid_ishtp_cl;

	if (ishtp_wait_resume(ishtp_get_ishtp_device(hid_ishtp_cl))) {
		client_data->suspended = false;
		wake_up_interruptible(&client_data->ishtp_resume_wait);
	}
}

ishtp_print_log ishtp_hid_print_trace;

/**
 * hid_ishtp_cl_probe() - ISHTP client driver probe
 * @cl_device:		ISHTP client device instance
 *
 * This function gets called on device create on ISHTP bus
 *
 * Return: 0 on success, non zero on error
 */
static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
{
	struct ishtp_cl *hid_ishtp_cl;
	struct ishtp_cl_data *client_data;
	int rv;

	if (!cl_device)
		return	-ENODEV;

	client_data = devm_kzalloc(ishtp_device(cl_device),
				   sizeof(*client_data),
				   GFP_KERNEL);
	if (!client_data)
		return -ENOMEM;

	hid_ishtp_cl = ishtp_cl_allocate(cl_device);
	if (!hid_ishtp_cl)
		return -ENOMEM;

	ishtp_set_drvdata(cl_device, hid_ishtp_cl);
	ishtp_set_client_data(hid_ishtp_cl, client_data);
	client_data->hid_ishtp_cl = hid_ishtp_cl;
	client_data->cl_device = cl_device;

	init_waitqueue_head(&client_data->init_wait);
	init_waitqueue_head(&client_data->ishtp_resume_wait);

	INIT_WORK(&client_data->work, hid_ishtp_cl_reset_handler);
	INIT_WORK(&client_data->resume_work, hid_ishtp_cl_resume_handler);


	ishtp_hid_print_trace = ishtp_trace_callback(cl_device);

	rv = hid_ishtp_cl_init(hid_ishtp_cl, 0);
	if (rv) {
		ishtp_cl_free(hid_ishtp_cl);
		return rv;
	}
	ishtp_get_device(cl_device);

	return 0;
}

/**
 * hid_ishtp_cl_remove() - ISHTP client driver remove
 * @cl_device:		ISHTP client device instance
 *
 * This function gets called on device remove on ISHTP bus
 *
 * Return: 0
 */
static void hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
{
	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);

	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
			hid_ishtp_cl);

	dev_dbg(ishtp_device(cl_device), "%s\n", __func__);
	ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_DISCONNECTING);
	ishtp_cl_disconnect(hid_ishtp_cl);
	ishtp_put_device(cl_device);
	ishtp_hid_remove(client_data);
	hid_ishtp_cl_deinit(hid_ishtp_cl);

	hid_ishtp_cl = NULL;

	client_data->num_hid_devices = 0;
}

/**
 * hid_ishtp_cl_reset() - ISHTP client driver reset
 * @cl_device:		ISHTP client device instance
 *
 * This function gets called on device reset on ISHTP bus
 *
 * Return: 0
 */
static int hid_ishtp_cl_reset(struct ishtp_cl_device *cl_device)
{
	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);

	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
			hid_ishtp_cl);

	schedule_work(&client_data->work);

	return 0;
}

/**
 * hid_ishtp_cl_suspend() - ISHTP client driver suspend
 * @device:	device instance
 *
 * This function gets called on system suspend
 *
 * Return: 0
 */
static int hid_ishtp_cl_suspend(struct device *device)
{
	struct ishtp_cl_device *cl_device = ishtp_dev_to_cl_device(device);
	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);

	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
			hid_ishtp_cl);
	client_data->suspended = true;

	return 0;
}

/**
 * hid_ishtp_cl_resume() - ISHTP client driver resume
 * @device:	device instance
 *
 * This function gets called on system resume
 *
 * Return: 0
 */
static int hid_ishtp_cl_resume(struct device *device)
{
	struct ishtp_cl_device *cl_device = ishtp_dev_to_cl_device(device);
	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);

	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
			hid_ishtp_cl);
	schedule_work(&client_data->resume_work);
	return 0;
}

static const struct dev_pm_ops hid_ishtp_pm_ops = {
	.suspend = hid_ishtp_cl_suspend,
	.resume = hid_ishtp_cl_resume,
};

static struct ishtp_cl_driver	hid_ishtp_cl_driver = {
	.name = "ish-hid",
	.guid = &hid_ishtp_guid,
	.probe = hid_ishtp_cl_probe,
	.remove = hid_ishtp_cl_remove,
	.reset = hid_ishtp_cl_reset,
	.driver.pm = &hid_ishtp_pm_ops,
};

static int __init ish_hid_init(void)
{
	int	rv;

	/* Register ISHTP client device driver with ISHTP Bus */
	rv = ishtp_cl_driver_register(&hid_ishtp_cl_driver, THIS_MODULE);

	return rv;

}

static void __exit ish_hid_exit(void)
{
	ishtp_cl_driver_unregister(&hid_ishtp_cl_driver);
}

late_initcall(ish_hid_init);
module_exit(ish_hid_exit);

MODULE_DESCRIPTION("ISH ISHTP HID client driver");
/* Primary author */
MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
/*
 * Several modification for multi instance support
 * suspend/resume and clean up
 */
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");

MODULE_LICENSE("GPL");
MODULE_ALIAS("ishtp:*");