aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/mvebu/patches-5.4/902-drivers-mfd-Add-a-driver-for-IEI-WT61P803-PUZZLE-MCU.patch
blob: 194feee5691e90d29cfff469bd91054207f68ae4 (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
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
From 692cfa85272dd12995b427c0a7a585ced5d54f32 Mon Sep 17 00:00:00 2001
From: Luka Kovacic <luka.kovacic () sartura ! hr>
Date: Tue, 24 Aug 2021 12:44:33 +0000
Subject: [PATCH 2/7] drivers: mfd: Add a driver for IEI WT61P803 PUZZLE MCU

Add a driver for the IEI WT61P803 PUZZLE microcontroller, used in some
IEI Puzzle series devices. The microcontroller controls system power,
temperature sensors, fans and LEDs.

This driver implements the core functionality for device communication
over the system serial (serdev bus). It handles MCU messages and the
internal MCU properties. Some properties can be managed over sysfs.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Signed-off-by: Pavo Banicevic <pavo.banicevic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Robert Marko <robert.marko@sartura.hr>
---
 drivers/mfd/Kconfig                     |   8 +
 drivers/mfd/Makefile                    |   1 +
 drivers/mfd/iei-wt61p803-puzzle.c       | 908 ++++++++++++++++++++++++
 include/linux/mfd/iei-wt61p803-puzzle.h |  66 ++
 4 files changed, 983 insertions(+)
 create mode 100644 drivers/mfd/iei-wt61p803-puzzle.c
 create mode 100644 include/linux/mfd/iei-wt61p803-puzzle.h

--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -531,6 +531,15 @@ config LPC_SCH
 	  LPC bridge function of the Intel SCH provides support for
 	  System Management Bus and General Purpose I/O.
 
+config MFD_IEI_WT61P803_PUZZLE
+	tristate "IEI WT61P803 PUZZLE MCU driver"
+	depends on SERIAL_DEV_BUS
+	select MFD_CORE
+	help
+	  IEI WT61P803 PUZZLE is a system power management microcontroller
+	  used for fan control, temperature sensor reading, LED control
+	  and system identification.
+
 config INTEL_SOC_PMIC
 	bool "Support for Crystal Cove PMIC"
 	depends on ACPI && HAS_IOMEM && I2C=y && GPIOLIB && COMMON_CLK
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -232,6 +232,7 @@ obj-$(CONFIG_MFD_HI655X_PMIC)   += hi655
 obj-$(CONFIG_MFD_DLN2)		+= dln2.o
 obj-$(CONFIG_MFD_RT5033)	+= rt5033.o
 obj-$(CONFIG_MFD_SKY81452)	+= sky81452.o
+obj-$(CONFIG_MFD_IEI_WT61P803_PUZZLE)	+= iei-wt61p803-puzzle.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
--- /dev/null
+++ b/drivers/mfd/iei-wt61p803-puzzle.c
@@ -0,0 +1,908 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* IEI WT61P803 PUZZLE MCU Driver
+ * System management microcontroller for fan control, temperature sensor reading,
+ * LED control and system identification on IEI Puzzle series ARM-based appliances.
+ *
+ * Copyright (C) 2020 Sartura Ltd.
+ * Author: Luka Kovacic <luka.kovacic@sartura.hr>
+ */
+
+#include <linux/atomic.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/iei-wt61p803-puzzle.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/property.h>
+#include <linux/sched.h>
+#include <linux/serdev.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <asm/unaligned.h>
+
+/* start, payload and XOR checksum at end */
+#define IEI_WT61P803_PUZZLE_MAX_COMMAND_LENGTH	(1 + 20 + 1)
+#define IEI_WT61P803_PUZZLE_RESP_BUF_SIZE	512
+
+#define IEI_WT61P803_PUZZLE_MAC_LENGTH			17
+#define IEI_WT61P803_PUZZLE_SN_LENGTH			36
+#define IEI_WT61P803_PUZZLE_VERSION_LENGTH		 6
+#define IEI_WT61P803_PUZZLE_BUILD_INFO_LENGTH		16
+#define IEI_WT61P803_PUZZLE_PROTOCOL_VERSION_LENGTH	 8
+#define IEI_WT61P803_PUZZLE_NB_MAC			 8
+
+/* Use HZ as a timeout value throughout the driver */
+#define IEI_WT61P803_PUZZLE_GENERAL_TIMEOUT HZ
+
+enum iei_wt61p803_puzzle_attribute_type {
+	IEI_WT61P803_PUZZLE_VERSION,
+	IEI_WT61P803_PUZZLE_BUILD_INFO,
+	IEI_WT61P803_PUZZLE_BOOTLOADER_MODE,
+	IEI_WT61P803_PUZZLE_PROTOCOL_VERSION,
+	IEI_WT61P803_PUZZLE_SERIAL_NUMBER,
+	IEI_WT61P803_PUZZLE_MAC_ADDRESS,
+	IEI_WT61P803_PUZZLE_AC_RECOVERY_STATUS,
+	IEI_WT61P803_PUZZLE_POWER_LOSS_RECOVERY,
+	IEI_WT61P803_PUZZLE_POWER_STATUS,
+};
+
+struct iei_wt61p803_puzzle_device_attribute {
+	struct device_attribute dev_attr;
+	enum iei_wt61p803_puzzle_attribute_type type;
+	u8 index;
+};
+
+/**
+ * struct iei_wt61p803_puzzle_mcu_status - MCU flags state
+ * @ac_recovery_status_flag:	AC Recovery Status Flag
+ * @power_loss_recovery:	System recovery after power loss
+ * @power_status:		System Power-on Method
+ */
+struct iei_wt61p803_puzzle_mcu_status {
+	u8 ac_recovery_status_flag;
+	u8 power_loss_recovery;
+	u8 power_status;
+};
+
+/**
+ * struct iei_wt61p803_puzzle_reply - MCU reply
+ * @size:	Size of the MCU reply
+ * @data:	Full MCU reply buffer
+ * @state:	Current state of the packet
+ * @received:	Was the response fullfilled
+ */
+struct iei_wt61p803_puzzle_reply {
+	size_t size;
+	unsigned char data[IEI_WT61P803_PUZZLE_RESP_BUF_SIZE];
+	struct completion received;
+};
+
+/**
+ * struct iei_wt61p803_puzzle_mcu_version - MCU version status
+ * @version:		Primary firmware version
+ * @build_info:		Build date and time
+ * @bootloader_mode:	Status of the MCU operation
+ * @protocol_version:	MCU communication protocol version
+ * @serial_number:	Device factory serial number
+ * @mac_address:	Device factory MAC addresses
+ *
+ * Last element of arrays is reserved for '\0'.
+ */
+struct iei_wt61p803_puzzle_mcu_version {
+	char version[IEI_WT61P803_PUZZLE_VERSION_LENGTH + 1];
+	char build_info[IEI_WT61P803_PUZZLE_BUILD_INFO_LENGTH + 1];
+	bool bootloader_mode;
+	char protocol_version[IEI_WT61P803_PUZZLE_PROTOCOL_VERSION_LENGTH + 1];
+	char serial_number[IEI_WT61P803_PUZZLE_SN_LENGTH + 1];
+	char mac_address[IEI_WT61P803_PUZZLE_NB_MAC][IEI_WT61P803_PUZZLE_MAC_LENGTH + 1];
+};
+
+/**
+ * struct iei_wt61p803_puzzle - IEI WT61P803 PUZZLE MCU Driver
+ * @serdev:		Pointer to underlying serdev device
+ * @dev:		Pointer to underlying dev device
+ * @reply_lock:		Reply mutex lock
+ * @reply:		Pointer to the iei_wt61p803_puzzle_reply struct
+ * @version:		MCU version related data
+ * @status:		MCU status related data
+ * @response_buffer	Command response buffer allocation
+ * @lock		General member mutex lock
+ */
+struct iei_wt61p803_puzzle {
+	struct serdev_device *serdev;
+	struct device *dev;
+	struct mutex reply_lock; /* lock to prevent multiple firmware calls */
+	struct iei_wt61p803_puzzle_reply *reply;
+	struct iei_wt61p803_puzzle_mcu_version version;
+	struct iei_wt61p803_puzzle_mcu_status status;
+	unsigned char response_buffer[IEI_WT61P803_PUZZLE_BUF_SIZE];
+	struct mutex lock; /* lock to protect response buffer */
+};
+
+static unsigned char iei_wt61p803_puzzle_checksum(unsigned char *buf, size_t len)
+{
+	unsigned char checksum = 0;
+	size_t i;
+
+	for (i = 0; i < len; i++)
+		checksum ^= buf[i];
+	return checksum;
+}
+
+static int iei_wt61p803_puzzle_process_resp(struct iei_wt61p803_puzzle *mcu,
+					    const unsigned char *raw_resp_data, size_t size)
+{
+	unsigned char checksum;
+
+	/* Check the incoming frame header */
+	if (!(raw_resp_data[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START ||
+	      raw_resp_data[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER ||
+	     (raw_resp_data[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM &&
+	      raw_resp_data[1] == IEI_WT61P803_PUZZLE_CMD_EEPROM_READ))) {
+		if (mcu->reply->size + size >= sizeof(mcu->reply->data))
+			return -EIO;
+
+		/* Append the frame to existing data */
+		memcpy(mcu->reply->data + mcu->reply->size, raw_resp_data, size);
+		mcu->reply->size += size;
+	} else {
+		if (size >= sizeof(mcu->reply->data))
+			return -EIO;
+
+		/* Start processing a new frame */
+		memcpy(mcu->reply->data, raw_resp_data, size);
+		mcu->reply->size = size;
+	}
+
+	checksum = iei_wt61p803_puzzle_checksum(mcu->reply->data, mcu->reply->size - 1);
+	if (checksum != mcu->reply->data[mcu->reply->size - 1]) {
+		/* The checksum isn't matched yet, wait for new frames */
+		return size;
+	}
+
+	/* Received all the data */
+	complete(&mcu->reply->received);
+
+	return size;
+}
+
+static int iei_wt61p803_puzzle_recv_buf(struct serdev_device *serdev,
+					const unsigned char *data, size_t size)
+{
+	struct iei_wt61p803_puzzle *mcu = serdev_device_get_drvdata(serdev);
+	int ret;
+
+	ret = iei_wt61p803_puzzle_process_resp(mcu, data, size);
+	/* Return the number of processed bytes if function returns error,
+	 * discard the remaining incoming data, since the frame this data
+	 * belongs to is broken anyway
+	 */
+	if (ret < 0)
+		return size;
+
+	return ret;
+}
+
+static const struct serdev_device_ops iei_wt61p803_puzzle_serdev_device_ops = {
+	.receive_buf  = iei_wt61p803_puzzle_recv_buf,
+	.write_wakeup = serdev_device_write_wakeup,
+};
+
+/**
+ * iei_wt61p803_puzzle_write_command_watchdog() - Watchdog of the normal cmd
+ * @mcu: Pointer to the iei_wt61p803_puzzle core MFD struct
+ * @cmd: Pointer to the char array to send (size should be content + 1 (xor))
+ * @size: Size of the cmd char array
+ * @reply_data: Pointer to the reply/response data array (should be allocated)
+ * @reply_size: Pointer to size_t (size of reply_data)
+ * @retry_count: Number of times to retry sending the command to the MCU
+ */
+int iei_wt61p803_puzzle_write_command_watchdog(struct iei_wt61p803_puzzle *mcu,
+					       unsigned char *cmd, size_t size,
+					       unsigned char *reply_data,
+					       size_t *reply_size, int retry_count)
+{
+	struct device *dev = &mcu->serdev->dev;
+	int ret, i;
+
+	for (i = 0; i < retry_count; i++) {
+		ret = iei_wt61p803_puzzle_write_command(mcu, cmd, size,
+							reply_data, reply_size);
+		if (ret != -ETIMEDOUT)
+			return ret;
+	}
+
+	dev_err(dev, "Command response timed out. Retries: %d\n", retry_count);
+
+	return -ETIMEDOUT;
+}
+EXPORT_SYMBOL_GPL(iei_wt61p803_puzzle_write_command_watchdog);
+
+/**
+ * iei_wt61p803_puzzle_write_command() - Send a structured command to the MCU
+ * @mcu: Pointer to the iei_wt61p803_puzzle core MFD struct
+ * @cmd: Pointer to the char array to send (size should be content + 1 (xor))
+ * @size: Size of the cmd char array
+ * @reply_data: Pointer to the reply/response data array (should be allocated)
+ *
+ * Sends a structured command to the MCU.
+ */
+int iei_wt61p803_puzzle_write_command(struct iei_wt61p803_puzzle *mcu,
+				      unsigned char *cmd, size_t size,
+				      unsigned char *reply_data,
+				      size_t *reply_size)
+{
+	struct device *dev = &mcu->serdev->dev;
+	int ret;
+
+	if (size <= 1 || size > IEI_WT61P803_PUZZLE_MAX_COMMAND_LENGTH)
+		return -EINVAL;
+
+	mutex_lock(&mcu->reply_lock);
+
+	cmd[size - 1] = iei_wt61p803_puzzle_checksum(cmd, size - 1);
+
+	/* Initialize reply struct */
+	reinit_completion(&mcu->reply->received);
+	mcu->reply->size = 0;
+	usleep_range(2000, 10000);
+	serdev_device_write_flush(mcu->serdev);
+	ret = serdev_device_write_buf(mcu->serdev, cmd, size);
+	if (ret < 0)
+		goto exit;
+
+	serdev_device_wait_until_sent(mcu->serdev, IEI_WT61P803_PUZZLE_GENERAL_TIMEOUT);
+	ret = wait_for_completion_timeout(&mcu->reply->received,
+					  IEI_WT61P803_PUZZLE_GENERAL_TIMEOUT);
+	if (ret == 0) {
+		dev_err(dev, "Command reply receive timeout\n");
+		ret = -ETIMEDOUT;
+		goto exit;
+	}
+
+	*reply_size = mcu->reply->size;
+	/* Copy the received data, as it will not be available after a new frame is received */
+	memcpy(reply_data, mcu->reply->data, mcu->reply->size);
+	ret = 0;
+exit:
+	mutex_unlock(&mcu->reply_lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(iei_wt61p803_puzzle_write_command);
+
+static int iei_wt61p803_puzzle_buzzer(struct iei_wt61p803_puzzle *mcu, bool long_beep)
+{
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char buzzer_cmd[4] = {};
+	size_t reply_size;
+	int ret;
+
+	buzzer_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START;
+	buzzer_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE;
+	buzzer_cmd[2] = long_beep ? '3' : '2'; /* Buzzer 1.5 / 0.5 second beep */
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu, buzzer_cmd, sizeof(buzzer_cmd),
+						resp_buf, &reply_size);
+	if (ret)
+		goto exit;
+
+	if (reply_size != 3) {
+		ret = -EIO;
+		goto exit;
+	}
+
+	if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
+	      resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
+	      resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
+		ret = -EPROTO;
+		goto exit;
+	}
+exit:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_get_version(struct iei_wt61p803_puzzle *mcu)
+{
+	unsigned char version_cmd[3] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_OTHER_VERSION,
+	};
+	unsigned char build_info_cmd[3] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_OTHER_BUILD,
+	};
+	unsigned char bootloader_mode_cmd[3] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_OTHER_BOOTLOADER_MODE,
+	};
+	unsigned char protocol_version_cmd[3] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_OTHER_PROTOCOL_VERSION,
+	};
+	unsigned char *rb = mcu->response_buffer;
+	size_t reply_size;
+	int ret;
+
+	mutex_lock(&mcu->lock);
+
+	ret = iei_wt61p803_puzzle_write_command(mcu, version_cmd, sizeof(version_cmd),
+						rb, &reply_size);
+	if (ret)
+		goto err;
+	if (reply_size < 7) {
+		ret = -EIO;
+		goto err;
+	}
+	sprintf(mcu->version.version, "v%c.%.3s", rb[2], &rb[3]);
+
+	ret = iei_wt61p803_puzzle_write_command(mcu, build_info_cmd,
+						sizeof(build_info_cmd),	rb,
+						&reply_size);
+	if (ret)
+		goto err;
+	if (reply_size < 15) {
+		ret = -EIO;
+		goto err;
+	}
+	sprintf(mcu->version.build_info, "%c%c/%c%c/%.4s %c%c:%c%c",
+		rb[8], rb[9], rb[6], rb[7], &rb[2], rb[10], rb[11],
+		rb[12], rb[13]);
+
+	ret = iei_wt61p803_puzzle_write_command(mcu, bootloader_mode_cmd,
+						sizeof(bootloader_mode_cmd), rb,
+						&reply_size);
+	if (ret)
+		goto err;
+	if (reply_size < 4) {
+		ret = -EIO;
+		goto err;
+	}
+	if (rb[2] == IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_APPS)
+		mcu->version.bootloader_mode = false;
+	else if (rb[2] == IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_BOOTLOADER)
+		mcu->version.bootloader_mode = true;
+
+	ret = iei_wt61p803_puzzle_write_command(mcu, protocol_version_cmd,
+						sizeof(protocol_version_cmd), rb,
+						&reply_size);
+	if (ret)
+		goto err;
+	if (reply_size < 9) {
+		ret = -EIO;
+		goto err;
+	}
+	sprintf(mcu->version.protocol_version, "v%c.%c%c%c%c%c",
+		rb[7], rb[6], rb[5], rb[4], rb[3], rb[2]);
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_get_mcu_status(struct iei_wt61p803_puzzle *mcu)
+{
+	unsigned char mcu_status_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS,
+		IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS,
+	};
+	unsigned char *resp_buf = mcu->response_buffer;
+	size_t reply_size;
+	int ret;
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu, mcu_status_cmd, sizeof(mcu_status_cmd),
+						resp_buf, &reply_size);
+	if (ret)
+		goto exit;
+	if (reply_size < 20) {
+		ret = -EIO;
+		goto exit;
+	}
+
+	/* Response format:
+	 * (IDX	RESPONSE)
+	 * 0	@
+	 * 1	O
+	 * 2	S
+	 * 3	S
+	 * ...
+	 * 5	AC Recovery Status Flag
+	 * ...
+	 * 10	Power Loss Recovery
+	 * ...
+	 * 19	Power Status (system power on method)
+	 * 20	XOR checksum
+	 */
+	if (resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
+	    resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER &&
+	    resp_buf[2] == IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS &&
+	    resp_buf[3] == IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS) {
+		mcu->status.ac_recovery_status_flag = resp_buf[5];
+		mcu->status.power_loss_recovery = resp_buf[10];
+		mcu->status.power_status = resp_buf[19];
+	}
+exit:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_get_serial_number(struct iei_wt61p803_puzzle *mcu)
+{
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char serial_number_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
+		IEI_WT61P803_PUZZLE_CMD_EEPROM_READ,
+		0x00,	/* EEPROM read address */
+		0x24,	/* Data length */
+	};
+	size_t reply_size;
+	int ret;
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu, serial_number_cmd,
+						sizeof(serial_number_cmd),
+						resp_buf, &reply_size);
+	if (ret)
+		goto err;
+
+	if (reply_size < IEI_WT61P803_PUZZLE_SN_LENGTH + 4) {
+		ret = -EIO;
+		goto err;
+	}
+
+	sprintf(mcu->version.serial_number, "%.*s",
+		IEI_WT61P803_PUZZLE_SN_LENGTH, resp_buf + 4);
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_write_serial_number(struct iei_wt61p803_puzzle *mcu,
+						   unsigned char serial_number[36])
+{
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char serial_number_header[4] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
+		IEI_WT61P803_PUZZLE_CMD_EEPROM_WRITE,
+		0x00,	/* EEPROM write address */
+		0xC,	/* Data length */
+	};
+	unsigned char serial_number_cmd[4 + 12 + 1]; /* header, serial number, XOR checksum */
+	int ret, sn_counter;
+	size_t reply_size;
+
+	/* The MCU can only handle 22 byte messages, send the S/N in 12 byte chunks */
+	mutex_lock(&mcu->lock);
+	for (sn_counter = 0; sn_counter < 3; sn_counter++) {
+		serial_number_header[2] = 0x0 + 0xC * sn_counter;
+
+		memcpy(serial_number_cmd, serial_number_header, sizeof(serial_number_header));
+		memcpy(serial_number_cmd + sizeof(serial_number_header),
+		       serial_number + 0xC * sn_counter, 0xC);
+
+		ret = iei_wt61p803_puzzle_write_command(mcu, serial_number_cmd,
+							sizeof(serial_number_cmd),
+							resp_buf, &reply_size);
+		if (ret)
+			goto err;
+		if (reply_size != 3) {
+			ret = -EIO;
+			goto err;
+		}
+		if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
+		      resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
+		      resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
+			ret = -EPROTO;
+			goto err;
+		}
+	}
+
+	sprintf(mcu->version.serial_number, "%.*s",
+		IEI_WT61P803_PUZZLE_SN_LENGTH, serial_number);
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_get_mac_address(struct iei_wt61p803_puzzle *mcu, int index)
+{
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char mac_address_cmd[5] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
+		IEI_WT61P803_PUZZLE_CMD_EEPROM_READ,
+		0x00,	/* EEPROM read address */
+		0x11,	/* Data length */
+	};
+	size_t reply_size;
+	int ret;
+
+	mutex_lock(&mcu->lock);
+	mac_address_cmd[2] = 0x24 + 0x11 * index;
+
+	ret = iei_wt61p803_puzzle_write_command(mcu, mac_address_cmd,
+						sizeof(mac_address_cmd),
+						resp_buf, &reply_size);
+	if (ret)
+		goto err;
+
+	if (reply_size < 22) {
+		ret = -EIO;
+		goto err;
+	}
+
+	sprintf(mcu->version.mac_address[index], "%.*s",
+		IEI_WT61P803_PUZZLE_MAC_LENGTH, resp_buf + 4);
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int
+iei_wt61p803_puzzle_write_mac_address(struct iei_wt61p803_puzzle *mcu,
+				      unsigned char mac_address[IEI_WT61P803_PUZZLE_MAC_LENGTH],
+				      int mac_address_idx)
+{
+	unsigned char mac_address_cmd[4 + IEI_WT61P803_PUZZLE_MAC_LENGTH + 1];
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char mac_address_header[4] = {
+		IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
+		IEI_WT61P803_PUZZLE_CMD_EEPROM_WRITE,
+		0x00,	/* EEPROM write address */
+		0x11,	/* Data length */
+	};
+	size_t reply_size;
+	int ret;
+
+	if (mac_address_idx < 0 || mac_address_idx >= IEI_WT61P803_PUZZLE_NB_MAC)
+		return -EINVAL;
+
+	mac_address_header[2] = 0x24 + 0x11 * mac_address_idx;
+
+	/* Concat mac_address_header, mac_address to mac_address_cmd */
+	memcpy(mac_address_cmd, mac_address_header, sizeof(mac_address_header));
+	memcpy(mac_address_cmd + sizeof(mac_address_header), mac_address,
+	       IEI_WT61P803_PUZZLE_MAC_LENGTH);
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu, mac_address_cmd,
+						sizeof(mac_address_cmd),
+						resp_buf, &reply_size);
+	if (ret)
+		goto err;
+	if (reply_size != 3) {
+		ret = -EIO;
+		goto err;
+	}
+	if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
+	      resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
+	      resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
+		ret = -EPROTO;
+		goto err;
+	}
+
+	sprintf(mcu->version.mac_address[mac_address_idx], "%.*s",
+		IEI_WT61P803_PUZZLE_MAC_LENGTH, mac_address);
+err:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_write_power_loss_recovery(struct iei_wt61p803_puzzle *mcu,
+							 int power_loss_recovery_action)
+{
+	unsigned char *resp_buf = mcu->response_buffer;
+	unsigned char power_loss_recovery_cmd[5] = {};
+	size_t reply_size;
+	int ret;
+
+	if (power_loss_recovery_action < 0 || power_loss_recovery_action > 4)
+		return -EINVAL;
+
+	power_loss_recovery_cmd[0] = IEI_WT61P803_PUZZLE_CMD_HEADER_START;
+	power_loss_recovery_cmd[1] = IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER;
+	power_loss_recovery_cmd[2] = IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_POWER_LOSS;
+	power_loss_recovery_cmd[3] = hex_asc[power_loss_recovery_action];
+
+	mutex_lock(&mcu->lock);
+	ret = iei_wt61p803_puzzle_write_command(mcu, power_loss_recovery_cmd,
+						sizeof(power_loss_recovery_cmd),
+						resp_buf, &reply_size);
+	if (ret)
+		goto exit;
+	mcu->status.power_loss_recovery = power_loss_recovery_action;
+exit:
+	mutex_unlock(&mcu->lock);
+	return ret;
+}
+
+#define to_puzzle_dev_attr(_attr) \
+	container_of(_attr, struct iei_wt61p803_puzzle_device_attribute, dev_attr)
+
+static ssize_t show_output(struct device *dev,
+			   struct device_attribute *attr, char *buf)
+{
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev);
+	struct iei_wt61p803_puzzle_device_attribute *pattr = to_puzzle_dev_attr(attr);
+	int ret;
+
+	switch (pattr->type) {
+	case IEI_WT61P803_PUZZLE_VERSION:
+		return scnprintf(buf, PAGE_SIZE, "%s\n", mcu->version.version);
+	case IEI_WT61P803_PUZZLE_BUILD_INFO:
+		return scnprintf(buf, PAGE_SIZE, "%s\n", mcu->version.build_info);
+	case IEI_WT61P803_PUZZLE_BOOTLOADER_MODE:
+		return scnprintf(buf, PAGE_SIZE, "%d\n", mcu->version.bootloader_mode);
+	case IEI_WT61P803_PUZZLE_PROTOCOL_VERSION:
+		return scnprintf(buf, PAGE_SIZE, "%s\n", mcu->version.protocol_version);
+	case IEI_WT61P803_PUZZLE_SERIAL_NUMBER:
+		ret = iei_wt61p803_puzzle_get_serial_number(mcu);
+		if (!ret)
+			ret = scnprintf(buf, PAGE_SIZE, "%s\n", mcu->version.serial_number);
+		else
+			ret = 0;
+		return ret;
+	case IEI_WT61P803_PUZZLE_MAC_ADDRESS:
+		ret = iei_wt61p803_puzzle_get_mac_address(mcu, pattr->index);
+		if (!ret)
+			ret = scnprintf(buf, PAGE_SIZE, "%s\n",
+					mcu->version.mac_address[pattr->index]);
+		else
+			ret = 0;
+		return ret;
+	case IEI_WT61P803_PUZZLE_AC_RECOVERY_STATUS:
+	case IEI_WT61P803_PUZZLE_POWER_LOSS_RECOVERY:
+	case IEI_WT61P803_PUZZLE_POWER_STATUS:
+		ret = iei_wt61p803_puzzle_get_mcu_status(mcu);
+		if (ret)
+			return ret;
+
+		mutex_lock(&mcu->lock);
+		switch (pattr->type) {
+		case IEI_WT61P803_PUZZLE_AC_RECOVERY_STATUS:
+			ret = scnprintf(buf, PAGE_SIZE, "%x\n",
+					mcu->status.ac_recovery_status_flag);
+			break;
+		case IEI_WT61P803_PUZZLE_POWER_LOSS_RECOVERY:
+			ret = scnprintf(buf, PAGE_SIZE, "%x\n", mcu->status.power_loss_recovery);
+			break;
+		case IEI_WT61P803_PUZZLE_POWER_STATUS:
+			ret = scnprintf(buf, PAGE_SIZE, "%x\n", mcu->status.power_status);
+			break;
+		default:
+			ret = 0;
+			break;
+		}
+		mutex_unlock(&mcu->lock);
+		return ret;
+	default:
+		return 0;
+	}
+
+	return 0;
+}
+
+static ssize_t store_output(struct device *dev,
+			    struct device_attribute *attr,
+			    const char *buf, size_t len)
+{
+	unsigned char serial_number[IEI_WT61P803_PUZZLE_SN_LENGTH];
+	unsigned char mac_address[IEI_WT61P803_PUZZLE_MAC_LENGTH];
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev);
+	struct iei_wt61p803_puzzle_device_attribute *pattr = to_puzzle_dev_attr(attr);
+	int power_loss_recovery_action = 0;
+	int ret;
+
+	switch (pattr->type) {
+	case IEI_WT61P803_PUZZLE_SERIAL_NUMBER:
+		if (len != (size_t)(IEI_WT61P803_PUZZLE_SN_LENGTH + 1))
+			return -EINVAL;
+		memcpy(serial_number, buf, sizeof(serial_number));
+		ret = iei_wt61p803_puzzle_write_serial_number(mcu, serial_number);
+		if (ret)
+			return ret;
+		return len;
+	case IEI_WT61P803_PUZZLE_MAC_ADDRESS:
+		if (len != (size_t)(IEI_WT61P803_PUZZLE_MAC_LENGTH + 1))
+			return -EINVAL;
+
+		memcpy(mac_address, buf, sizeof(mac_address));
+
+		if (strlen(attr->attr.name) != 13)
+			return -EIO;
+
+		ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, pattr->index);
+		if (ret)
+			return ret;
+		return len;
+	case IEI_WT61P803_PUZZLE_POWER_LOSS_RECOVERY:
+		ret = kstrtoint(buf, 10, &power_loss_recovery_action);
+		if (ret)
+			return ret;
+		ret = iei_wt61p803_puzzle_write_power_loss_recovery(mcu,
+								    power_loss_recovery_action);
+		if (ret)
+			return ret;
+		return len;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+#define IEI_WT61P803_PUZZLE_ATTR(_name, _mode, _show, _store, _type, _index) \
+	struct iei_wt61p803_puzzle_device_attribute dev_attr_##_name = \
+		{ .dev_attr	= __ATTR(_name, _mode, _show, _store), \
+		  .type		= _type, \
+		  .index	= _index }
+
+#define IEI_WT61P803_PUZZLE_ATTR_RO(_name, _type, _id) \
+	IEI_WT61P803_PUZZLE_ATTR(_name, 0444, show_output, NULL, _type, _id)
+
+#define IEI_WT61P803_PUZZLE_ATTR_RW(_name, _type, _id) \
+	IEI_WT61P803_PUZZLE_ATTR(_name, 0644, show_output, store_output, _type, _id)
+
+static IEI_WT61P803_PUZZLE_ATTR_RO(version, IEI_WT61P803_PUZZLE_VERSION, 0);
+static IEI_WT61P803_PUZZLE_ATTR_RO(build_info, IEI_WT61P803_PUZZLE_BUILD_INFO, 0);
+static IEI_WT61P803_PUZZLE_ATTR_RO(bootloader_mode, IEI_WT61P803_PUZZLE_BOOTLOADER_MODE, 0);
+static IEI_WT61P803_PUZZLE_ATTR_RO(protocol_version, IEI_WT61P803_PUZZLE_PROTOCOL_VERSION, 0);
+static IEI_WT61P803_PUZZLE_ATTR_RW(serial_number, IEI_WT61P803_PUZZLE_SERIAL_NUMBER, 0);
+static IEI_WT61P803_PUZZLE_ATTR_RW(mac_address_0, IEI_WT61P803_PUZZLE_MAC_ADDRESS, 0);
+static IEI_WT61P803_PUZZLE_ATTR_RW(mac_address_1, IEI_WT61P803_PUZZLE_MAC_ADDRESS, 1);
+static IEI_WT61P803_PUZZLE_ATTR_RW(mac_address_2, IEI_WT61P803_PUZZLE_MAC_ADDRESS, 2);
+static IEI_WT61P803_PUZZLE_ATTR_RW(mac_address_3, IEI_WT61P803_PUZZLE_MAC_ADDRESS, 3);
+static IEI_WT61P803_PUZZLE_ATTR_RW(mac_address_4, IEI_WT61P803_PUZZLE_MAC_ADDRESS, 4);
+static IEI_WT61P803_PUZZLE_ATTR_RW(mac_address_5, IEI_WT61P803_PUZZLE_MAC_ADDRESS, 5);
+static IEI_WT61P803_PUZZLE_ATTR_RW(mac_address_6, IEI_WT61P803_PUZZLE_MAC_ADDRESS, 6);
+static IEI_WT61P803_PUZZLE_ATTR_RW(mac_address_7, IEI_WT61P803_PUZZLE_MAC_ADDRESS, 7);
+static IEI_WT61P803_PUZZLE_ATTR_RO(ac_recovery_status, IEI_WT61P803_PUZZLE_AC_RECOVERY_STATUS, 0);
+static IEI_WT61P803_PUZZLE_ATTR_RW(power_loss_recovery, IEI_WT61P803_PUZZLE_POWER_LOSS_RECOVERY, 0);
+static IEI_WT61P803_PUZZLE_ATTR_RO(power_status, IEI_WT61P803_PUZZLE_POWER_STATUS, 0);
+
+static struct attribute *iei_wt61p803_puzzle_attrs[] = {
+	&dev_attr_version.dev_attr.attr,
+	&dev_attr_build_info.dev_attr.attr,
+	&dev_attr_bootloader_mode.dev_attr.attr,
+	&dev_attr_protocol_version.dev_attr.attr,
+	&dev_attr_serial_number.dev_attr.attr,
+	&dev_attr_mac_address_0.dev_attr.attr,
+	&dev_attr_mac_address_1.dev_attr.attr,
+	&dev_attr_mac_address_2.dev_attr.attr,
+	&dev_attr_mac_address_3.dev_attr.attr,
+	&dev_attr_mac_address_4.dev_attr.attr,
+	&dev_attr_mac_address_5.dev_attr.attr,
+	&dev_attr_mac_address_6.dev_attr.attr,
+	&dev_attr_mac_address_7.dev_attr.attr,
+	&dev_attr_ac_recovery_status.dev_attr.attr,
+	&dev_attr_power_loss_recovery.dev_attr.attr,
+	&dev_attr_power_status.dev_attr.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(iei_wt61p803_puzzle);
+
+static int iei_wt61p803_puzzle_sysfs_create(struct device *dev,
+					    struct iei_wt61p803_puzzle *mcu)
+{
+	int ret;
+
+	ret = sysfs_create_groups(&mcu->dev->kobj, iei_wt61p803_puzzle_groups);
+	if (ret)
+		mfd_remove_devices(mcu->dev);
+
+	return ret;
+}
+
+static int iei_wt61p803_puzzle_sysfs_remove(struct device *dev,
+					    struct iei_wt61p803_puzzle *mcu)
+{
+	/* Remove sysfs groups */
+	sysfs_remove_groups(&mcu->dev->kobj, iei_wt61p803_puzzle_groups);
+	mfd_remove_devices(mcu->dev);
+
+	return 0;
+}
+
+static int iei_wt61p803_puzzle_probe(struct serdev_device *serdev)
+{
+	struct device *dev = &serdev->dev;
+	struct iei_wt61p803_puzzle *mcu;
+	u32 baud;
+	int ret;
+
+	/* Read the baud rate from 'current-speed', because the MCU supports different rates */
+	if (device_property_read_u32(dev, "current-speed", &baud)) {
+		dev_err(dev,
+			"'current-speed' is not specified in device node\n");
+		return -EINVAL;
+	}
+	dev_dbg(dev, "Driver baud rate: %d\n", baud);
+
+	/* Allocate the memory */
+	mcu = devm_kzalloc(dev, sizeof(*mcu), GFP_KERNEL);
+	if (!mcu)
+		return -ENOMEM;
+
+	mcu->reply = devm_kzalloc(dev, sizeof(*mcu->reply), GFP_KERNEL);
+	if (!mcu->reply)
+		return -ENOMEM;
+
+	/* Initialize device struct data */
+	mcu->serdev = serdev;
+	mcu->dev = dev;
+	init_completion(&mcu->reply->received);
+	mutex_init(&mcu->reply_lock);
+	mutex_init(&mcu->lock);
+
+	/* Setup UART interface */
+	serdev_device_set_drvdata(serdev, mcu);
+	serdev_device_set_client_ops(serdev, &iei_wt61p803_puzzle_serdev_device_ops);
+	ret = devm_serdev_device_open(dev, serdev);
+	if (ret)
+		return ret;
+	serdev_device_set_baudrate(serdev, baud);
+	serdev_device_set_flow_control(serdev, false);
+	ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE);
+	if (ret) {
+		dev_err(dev, "Failed to set parity\n");
+		return ret;
+	}
+
+	ret = iei_wt61p803_puzzle_get_version(mcu);
+	if (ret)
+		return ret;
+
+	dev_dbg(dev, "MCU version: %s\n", mcu->version.version);
+	dev_dbg(dev, "MCU firmware build info: %s\n", mcu->version.build_info);
+	dev_dbg(dev, "MCU in bootloader mode: %s\n",
+		mcu->version.bootloader_mode ? "true" : "false");
+	dev_dbg(dev, "MCU protocol version: %s\n", mcu->version.protocol_version);
+
+	if (device_property_read_bool(dev, "enable-beep")) {
+		ret = iei_wt61p803_puzzle_buzzer(mcu, false);
+		if (ret)
+			return ret;
+	}
+
+	ret = iei_wt61p803_puzzle_sysfs_create(dev, mcu);
+	if (ret)
+		return ret;
+
+	return devm_of_platform_populate(dev);
+}
+
+static void iei_wt61p803_puzzle_remove(struct serdev_device *serdev)
+{
+	struct device *dev = &serdev->dev;
+	struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev);
+
+	iei_wt61p803_puzzle_sysfs_remove(dev, mcu);
+}
+
+static const struct of_device_id iei_wt61p803_puzzle_dt_ids[] = {
+	{ .compatible = "iei,wt61p803-puzzle" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, iei_wt61p803_puzzle_dt_ids);
+
+static struct serdev_device_driver iei_wt61p803_puzzle_drv = {
+	.probe			= iei_wt61p803_puzzle_probe,
+	.remove			= iei_wt61p803_puzzle_remove,
+	.driver = {
+		.name		= "iei-wt61p803-puzzle",
+		.of_match_table	= iei_wt61p803_puzzle_dt_ids,
+	},
+};
+
+module_serdev_device_driver(iei_wt61p803_puzzle_drv);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Luka Kovacic <luka.kovacic@sartura.hr>");
+MODULE_DESCRIPTION("IEI WT61P803 PUZZLE MCU Driver");
--- /dev/null
+++ b/include/linux/mfd/iei-wt61p803-puzzle.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* IEI WT61P803 PUZZLE MCU Driver
+ * System management microcontroller for fan control, temperature sensor reading,
+ * LED control and system identification on IEI Puzzle series ARM-based appliances.
+ *
+ * Copyright (C) 2020 Sartura Ltd.
+ * Author: Luka Kovacic <luka.kovacic@sartura.hr>
+ */
+
+#ifndef _MFD_IEI_WT61P803_PUZZLE_H_
+#define _MFD_IEI_WT61P803_PUZZLE_H_
+
+#define IEI_WT61P803_PUZZLE_BUF_SIZE 512
+
+/* Command magic numbers */
+#define IEI_WT61P803_PUZZLE_CMD_HEADER_START		0x40 /* @ */
+#define IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER	0x25 /* % */
+#define IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM		0xF7
+
+#define IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK		0x30 /* 0 */
+#define IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK	0x70
+
+#define IEI_WT61P803_PUZZLE_CMD_EEPROM_READ		0xA1
+#define IEI_WT61P803_PUZZLE_CMD_EEPROM_WRITE		0xA0
+
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_VERSION		0x56 /* V */
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_BUILD		0x42 /* B */
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_BOOTLOADER_MODE	0x4D /* M */
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_BOOTLOADER	0x30
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_APPS		0x31
+#define IEI_WT61P803_PUZZLE_CMD_OTHER_PROTOCOL_VERSION	0x50 /* P */
+
+#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE		0x43 /* C */
+#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER		0x4F /* O */
+#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS	0x53 /* S */
+#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_POWER_LOSS 0x41 /* A */
+
+#define IEI_WT61P803_PUZZLE_CMD_LED			0x52 /* R */
+#define IEI_WT61P803_PUZZLE_CMD_LED_POWER		0x31 /* 1 */
+
+#define IEI_WT61P803_PUZZLE_CMD_TEMP			0x54 /* T */
+#define IEI_WT61P803_PUZZLE_CMD_TEMP_ALL		0x41 /* A */
+
+#define IEI_WT61P803_PUZZLE_CMD_FAN			0x46 /* F */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ		0x5A /* Z */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_WRITE		0x57 /* W */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_BASE		0x30
+#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_BASE		0x41 /* A */
+
+#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM(x) (IEI_WT61P803_PUZZLE_CMD_FAN_PWM_BASE + (x)) /* 0 - 1 */
+#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM(x) (IEI_WT61P803_PUZZLE_CMD_FAN_RPM_BASE + (x)) /* 0 - 5 */
+
+struct iei_wt61p803_puzzle_mcu_version;
+struct iei_wt61p803_puzzle_reply;
+struct iei_wt61p803_puzzle;
+
+int iei_wt61p803_puzzle_write_command_watchdog(struct iei_wt61p803_puzzle *mcu,
+					       unsigned char *cmd, size_t size,
+					       unsigned char *reply_data, size_t *reply_size,
+					       int retry_count);
+
+int iei_wt61p803_puzzle_write_command(struct iei_wt61p803_puzzle *mcu,
+				      unsigned char *cmd, size_t size,
+				      unsigned char *reply_data, size_t *reply_size);
+
+#endif /* _MFD_IEI_WT61P803_PUZZLE_H_ */