summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-alps.c
blob: 6f1fe7248d81c7404e8ea864f09ca65967ebfc52 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 2016 Masaki Ota <masaki.ota@jp.alps.com>
 */

#include <linux/kernel.h>
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/module.h>
#include <asm/unaligned.h>
#include "hid-ids.h"

/* ALPS Device Product ID */
#define HID_PRODUCT_ID_T3_BTNLESS	0xD0C0
#define HID_PRODUCT_ID_COSMO		0x1202
#define HID_PRODUCT_ID_U1_PTP_1		0x1207
#define HID_PRODUCT_ID_U1			0x1209
#define HID_PRODUCT_ID_U1_PTP_2		0x120A
#define HID_PRODUCT_ID_U1_DUAL		0x120B
#define HID_PRODUCT_ID_T4_BTNLESS	0x120C

#define DEV_SINGLEPOINT				0x01
#define DEV_DUALPOINT				0x02

#define U1_MOUSE_REPORT_ID			0x01 /* Mouse data ReportID */
#define U1_ABSOLUTE_REPORT_ID		0x03 /* Absolute data ReportID */
#define U1_FEATURE_REPORT_ID		0x05 /* Feature ReportID */
#define U1_SP_ABSOLUTE_REPORT_ID	0x06 /* Feature ReportID */

#define U1_FEATURE_REPORT_LEN		0x08 /* Feature Report Length */
#define U1_FEATURE_REPORT_LEN_ALL	0x0A
#define U1_CMD_REGISTER_READ		0xD1
#define U1_CMD_REGISTER_WRITE		0xD2

#define	U1_DEVTYPE_SP_SUPPORT		0x10 /* SP Support */
#define	U1_DISABLE_DEV				0x01
#define U1_TP_ABS_MODE				0x02
#define	U1_SP_ABS_MODE				0x80

#define ADDRESS_U1_DEV_CTRL_1	0x00800040
#define ADDRESS_U1_DEVICE_TYP	0x00800043
#define ADDRESS_U1_NUM_SENS_X	0x00800047
#define ADDRESS_U1_NUM_SENS_Y	0x00800048
#define ADDRESS_U1_PITCH_SENS_X	0x00800049
#define ADDRESS_U1_PITCH_SENS_Y	0x0080004A
#define ADDRESS_U1_RESO_DWN_ABS 0x0080004E
#define ADDRESS_U1_PAD_BTN		0x00800052
#define ADDRESS_U1_SP_BTN		0x0080009F

#define T4_INPUT_REPORT_LEN			sizeof(struct t4_input_report)
#define T4_FEATURE_REPORT_LEN		T4_INPUT_REPORT_LEN
#define T4_FEATURE_REPORT_ID		7
#define T4_CMD_REGISTER_READ			0x08
#define T4_CMD_REGISTER_WRITE			0x07

#define T4_ADDRESS_BASE				0xC2C0
#define PRM_SYS_CONFIG_1			(T4_ADDRESS_BASE + 0x0002)
#define T4_PRM_FEED_CONFIG_1		(T4_ADDRESS_BASE + 0x0004)
#define T4_PRM_FEED_CONFIG_4		(T4_ADDRESS_BASE + 0x001A)
#define T4_PRM_ID_CONFIG_3			(T4_ADDRESS_BASE + 0x00B0)


#define T4_FEEDCFG4_ADVANCED_ABS_ENABLE			0x01
#define T4_I2C_ABS	0x78

#define T4_COUNT_PER_ELECTRODE		256
#define MAX_TOUCHES	5

enum dev_num {
	U1,
	T4,
	UNKNOWN,
};
/**
 * struct u1_data
 *
 * @input: pointer to the kernel input device
 * @input2: pointer to the kernel input2 device
 * @hdev: pointer to the struct hid_device
 *
 * @dev_type: device type
 * @max_fingers: total number of fingers
 * @has_sp: boolean of sp existense
 * @sp_btn_info: button information
 * @x_active_len_mm: active area length of X (mm)
 * @y_active_len_mm: active area length of Y (mm)
 * @x_max: maximum x coordinate value
 * @y_max: maximum y coordinate value
 * @x_min: minimum x coordinate value
 * @y_min: minimum y coordinate value
 * @btn_cnt: number of buttons
 * @sp_btn_cnt: number of stick buttons
 */
struct alps_dev {
	struct input_dev *input;
	struct input_dev *input2;
	struct hid_device *hdev;

	enum dev_num dev_type;
	u8  max_fingers;
	u8  has_sp;
	u8	sp_btn_info;
	u32	x_active_len_mm;
	u32	y_active_len_mm;
	u32	x_max;
	u32	y_max;
	u32	x_min;
	u32	y_min;
	u32	btn_cnt;
	u32	sp_btn_cnt;
};

struct t4_contact_data {
	u8  palm;
	u8	x_lo;
	u8	x_hi;
	u8	y_lo;
	u8	y_hi;
};

struct t4_input_report {
	u8  reportID;
	u8  numContacts;
	struct t4_contact_data contact[5];
	u8  button;
	u8  track[5];
	u8  zx[5], zy[5];
	u8  palmTime[5];
	u8  kilroy;
	u16 timeStamp;
};

static u16 t4_calc_check_sum(u8 *buffer,
		unsigned long offset, unsigned long length)
{
	u16 sum1 = 0xFF, sum2 = 0xFF;
	unsigned long i = 0;

	if (offset + length >= 50)
		return 0;

	while (length > 0) {
		u32 tlen = length > 20 ? 20 : length;

		length -= tlen;

		do {
			sum1 += buffer[offset + i];
			sum2 += sum1;
			i++;
		} while (--tlen > 0);

		sum1 = (sum1 & 0xFF) + (sum1 >> 8);
		sum2 = (sum2 & 0xFF) + (sum2 >> 8);
	}

	sum1 = (sum1 & 0xFF) + (sum1 >> 8);
	sum2 = (sum2 & 0xFF) + (sum2 >> 8);

	return(sum2 << 8 | sum1);
}

static int t4_read_write_register(struct hid_device *hdev, u32 address,
	u8 *read_val, u8 write_val, bool read_flag)
{
	int ret;
	u16 check_sum;
	u8 *input;
	u8 *readbuf = NULL;

	input = kzalloc(T4_FEATURE_REPORT_LEN, GFP_KERNEL);
	if (!input)
		return -ENOMEM;

	input[0] = T4_FEATURE_REPORT_ID;
	if (read_flag) {
		input[1] = T4_CMD_REGISTER_READ;
		input[8] = 0x00;
	} else {
		input[1] = T4_CMD_REGISTER_WRITE;
		input[8] = write_val;
	}
	put_unaligned_le32(address, input + 2);
	input[6] = 1;
	input[7] = 0;

	/* Calculate the checksum */
	check_sum = t4_calc_check_sum(input, 1, 8);
	input[9] = (u8)check_sum;
	input[10] = (u8)(check_sum >> 8);
	input[11] = 0;

	ret = hid_hw_raw_request(hdev, T4_FEATURE_REPORT_ID, input,
			T4_FEATURE_REPORT_LEN,
			HID_FEATURE_REPORT, HID_REQ_SET_REPORT);

	if (ret < 0) {
		dev_err(&hdev->dev, "failed to read command (%d)\n", ret);
		goto exit;
	}

	if (read_flag) {
		readbuf = kzalloc(T4_FEATURE_REPORT_LEN, GFP_KERNEL);
		if (!readbuf) {
			ret = -ENOMEM;
			goto exit;
		}

		ret = hid_hw_raw_request(hdev, T4_FEATURE_REPORT_ID, readbuf,
				T4_FEATURE_REPORT_LEN,
				HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
		if (ret < 0) {
			dev_err(&hdev->dev, "failed read register (%d)\n", ret);
			goto exit_readbuf;
		}

		ret = -EINVAL;

		if (*(u32 *)&readbuf[6] != address) {
			dev_err(&hdev->dev, "read register address error (%x,%x)\n",
				*(u32 *)&readbuf[6], address);
			goto exit_readbuf;
		}

		if (*(u16 *)&readbuf[10] != 1) {
			dev_err(&hdev->dev, "read register size error (%x)\n",
				*(u16 *)&readbuf[10]);
			goto exit_readbuf;
		}

		check_sum = t4_calc_check_sum(readbuf, 6, 7);
		if (*(u16 *)&readbuf[13] != check_sum) {
			dev_err(&hdev->dev, "read register checksum error (%x,%x)\n",
				*(u16 *)&readbuf[13], check_sum);
			goto exit_readbuf;
		}

		*read_val = readbuf[12];
	}

	ret = 0;

exit_readbuf:
	kfree(readbuf);
exit:
	kfree(input);
	return ret;
}

static int u1_read_write_register(struct hid_device *hdev, u32 address,
	u8 *read_val, u8 write_val, bool read_flag)
{
	int ret, i;
	u8 check_sum;
	u8 *input;
	u8 *readbuf;

	input = kzalloc(U1_FEATURE_REPORT_LEN, GFP_KERNEL);
	if (!input)
		return -ENOMEM;

	input[0] = U1_FEATURE_REPORT_ID;
	if (read_flag) {
		input[1] = U1_CMD_REGISTER_READ;
		input[6] = 0x00;
	} else {
		input[1] = U1_CMD_REGISTER_WRITE;
		input[6] = write_val;
	}

	put_unaligned_le32(address, input + 2);

	/* Calculate the checksum */
	check_sum = U1_FEATURE_REPORT_LEN_ALL;
	for (i = 0; i < U1_FEATURE_REPORT_LEN - 1; i++)
		check_sum += input[i];

	input[7] = check_sum;
	ret = hid_hw_raw_request(hdev, U1_FEATURE_REPORT_ID, input,
			U1_FEATURE_REPORT_LEN,
			HID_FEATURE_REPORT, HID_REQ_SET_REPORT);

	if (ret < 0) {
		dev_err(&hdev->dev, "failed to read command (%d)\n", ret);
		goto exit;
	}

	if (read_flag) {
		readbuf = kzalloc(U1_FEATURE_REPORT_LEN, GFP_KERNEL);
		if (!readbuf) {
			ret = -ENOMEM;
			goto exit;
		}

		ret = hid_hw_raw_request(hdev, U1_FEATURE_REPORT_ID, readbuf,
				U1_FEATURE_REPORT_LEN,
				HID_FEATURE_REPORT, HID_REQ_GET_REPORT);

		if (ret < 0) {
			dev_err(&hdev->dev, "failed read register (%d)\n", ret);
			kfree(readbuf);
			goto exit;
		}

		*read_val = readbuf[6];

		kfree(readbuf);
	}

	ret = 0;

exit:
	kfree(input);
	return ret;
}

static int t4_raw_event(struct alps_dev *hdata, u8 *data, int size)
{
	unsigned int x, y, z;
	int i;
	struct t4_input_report *p_report = (struct t4_input_report *)data;

	if (!data)
		return 0;
	for (i = 0; i < hdata->max_fingers; i++) {
		x = p_report->contact[i].x_hi << 8 | p_report->contact[i].x_lo;
		y = p_report->contact[i].y_hi << 8 | p_report->contact[i].y_lo;
		y = hdata->y_max - y + hdata->y_min;
		z = (p_report->contact[i].palm < 0x80 &&
			p_report->contact[i].palm > 0) * 62;
		if (x == 0xffff) {
			x = 0;
			y = 0;
			z = 0;
		}
		input_mt_slot(hdata->input, i);

		input_mt_report_slot_state(hdata->input,
			MT_TOOL_FINGER, z != 0);

		if (!z)
			continue;

		input_report_abs(hdata->input, ABS_MT_POSITION_X, x);
		input_report_abs(hdata->input, ABS_MT_POSITION_Y, y);
		input_report_abs(hdata->input, ABS_MT_PRESSURE, z);
	}
	input_mt_sync_frame(hdata->input);

	input_report_key(hdata->input, BTN_LEFT, p_report->button);

	input_sync(hdata->input);
	return 1;
}

static int u1_raw_event(struct alps_dev *hdata, u8 *data, int size)
{
	unsigned int x, y, z;
	int i;
	short sp_x, sp_y;

	if (!data)
		return 0;
	switch (data[0]) {
	case U1_MOUSE_REPORT_ID:
		break;
	case U1_FEATURE_REPORT_ID:
		break;
	case U1_ABSOLUTE_REPORT_ID:
		for (i = 0; i < hdata->max_fingers; i++) {
			u8 *contact = &data[i * 5];

			x = get_unaligned_le16(contact + 3);
			y = get_unaligned_le16(contact + 5);
			z = contact[7] & 0x7F;

			input_mt_slot(hdata->input, i);

			if (z != 0) {
				input_mt_report_slot_state(hdata->input,
					MT_TOOL_FINGER, 1);
				input_report_abs(hdata->input,
					ABS_MT_POSITION_X, x);
				input_report_abs(hdata->input,
					ABS_MT_POSITION_Y, y);
				input_report_abs(hdata->input,
					ABS_MT_PRESSURE, z);
			} else {
				input_mt_report_slot_inactive(hdata->input);
			}
		}

		input_mt_sync_frame(hdata->input);

		input_report_key(hdata->input, BTN_LEFT,
			data[1] & 0x1);
		input_report_key(hdata->input, BTN_RIGHT,
			(data[1] & 0x2));
		input_report_key(hdata->input, BTN_MIDDLE,
			(data[1] & 0x4));

		input_sync(hdata->input);

		return 1;

	case U1_SP_ABSOLUTE_REPORT_ID:
		sp_x = get_unaligned_le16(data+2);
		sp_y = get_unaligned_le16(data+4);

		sp_x = sp_x / 8;
		sp_y = sp_y / 8;

		input_report_rel(hdata->input2, REL_X, sp_x);
		input_report_rel(hdata->input2, REL_Y, sp_y);

		input_report_key(hdata->input2, BTN_LEFT,
			data[1] & 0x1);
		input_report_key(hdata->input2, BTN_RIGHT,
			(data[1] & 0x2));
		input_report_key(hdata->input2, BTN_MIDDLE,
			(data[1] & 0x4));

		input_sync(hdata->input2);

		return 1;
	}

	return 0;
}

static int alps_raw_event(struct hid_device *hdev,
		struct hid_report *report, u8 *data, int size)
{
	int ret = 0;
	struct alps_dev *hdata = hid_get_drvdata(hdev);

	switch (hdev->product) {
	case HID_PRODUCT_ID_T4_BTNLESS:
		ret = t4_raw_event(hdata, data, size);
		break;
	default:
		ret = u1_raw_event(hdata, data, size);
		break;
	}
	return ret;
}

static int __maybe_unused alps_post_reset(struct hid_device *hdev)
{
	int ret = -1;
	struct alps_dev *data = hid_get_drvdata(hdev);

	switch (data->dev_type) {
	case T4:
		ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_1,
			NULL, T4_I2C_ABS, false);
		if (ret < 0) {
			dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_1 (%d)\n",
				ret);
			goto exit;
		}

		ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_4,
			NULL, T4_FEEDCFG4_ADVANCED_ABS_ENABLE, false);
		if (ret < 0) {
			dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_4 (%d)\n",
				ret);
			goto exit;
		}
		break;
	case U1:
		ret = u1_read_write_register(hdev,
			ADDRESS_U1_DEV_CTRL_1, NULL,
			U1_TP_ABS_MODE | U1_SP_ABS_MODE, false);
		if (ret < 0) {
			dev_err(&hdev->dev, "failed to change TP mode (%d)\n",
				ret);
			goto exit;
		}
		break;
	default:
		break;
	}

exit:
	return ret;
}

static int __maybe_unused alps_post_resume(struct hid_device *hdev)
{
	return alps_post_reset(hdev);
}

static int u1_init(struct hid_device *hdev, struct alps_dev *pri_data)
{
	int ret;
	u8 tmp, dev_ctrl, sen_line_num_x, sen_line_num_y;
	u8 pitch_x, pitch_y, resolution;

	/* Device initialization */
	ret = u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,
			&dev_ctrl, 0, true);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed U1_DEV_CTRL_1 (%d)\n", ret);
		goto exit;
	}

	dev_ctrl &= ~U1_DISABLE_DEV;
	dev_ctrl |= U1_TP_ABS_MODE;
	ret = u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,
			NULL, dev_ctrl, false);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed to change TP mode (%d)\n", ret);
		goto exit;
	}

	ret = u1_read_write_register(hdev, ADDRESS_U1_NUM_SENS_X,
			&sen_line_num_x, 0, true);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed U1_NUM_SENS_X (%d)\n", ret);
		goto exit;
	}

	ret = u1_read_write_register(hdev, ADDRESS_U1_NUM_SENS_Y,
			&sen_line_num_y, 0, true);
		if (ret < 0) {
		dev_err(&hdev->dev, "failed U1_NUM_SENS_Y (%d)\n", ret);
		goto exit;
	}

	ret = u1_read_write_register(hdev, ADDRESS_U1_PITCH_SENS_X,
			&pitch_x, 0, true);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed U1_PITCH_SENS_X (%d)\n", ret);
		goto exit;
	}

	ret = u1_read_write_register(hdev, ADDRESS_U1_PITCH_SENS_Y,
			&pitch_y, 0, true);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed U1_PITCH_SENS_Y (%d)\n", ret);
		goto exit;
	}

	ret = u1_read_write_register(hdev, ADDRESS_U1_RESO_DWN_ABS,
		&resolution, 0, true);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed U1_RESO_DWN_ABS (%d)\n", ret);
		goto exit;
	}
	pri_data->x_active_len_mm =
		(pitch_x * (sen_line_num_x - 1)) / 10;
	pri_data->y_active_len_mm =
		(pitch_y * (sen_line_num_y - 1)) / 10;

	pri_data->x_max =
		(resolution << 2) * (sen_line_num_x - 1);
	pri_data->x_min = 1;
	pri_data->y_max =
		(resolution << 2) * (sen_line_num_y - 1);
	pri_data->y_min = 1;

	ret = u1_read_write_register(hdev, ADDRESS_U1_PAD_BTN,
			&tmp, 0, true);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed U1_PAD_BTN (%d)\n", ret);
		goto exit;
	}
	if ((tmp & 0x0F) == (tmp & 0xF0) >> 4) {
		pri_data->btn_cnt = (tmp & 0x0F);
	} else {
		/* Button pad */
		pri_data->btn_cnt = 1;
	}

	pri_data->has_sp = 0;
	/* Check StickPointer device */
	ret = u1_read_write_register(hdev, ADDRESS_U1_DEVICE_TYP,
			&tmp, 0, true);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed U1_DEVICE_TYP (%d)\n", ret);
		goto exit;
	}
	if (tmp & U1_DEVTYPE_SP_SUPPORT) {
		dev_ctrl |= U1_SP_ABS_MODE;
		ret = u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,
			NULL, dev_ctrl, false);
		if (ret < 0) {
			dev_err(&hdev->dev, "failed SP mode (%d)\n", ret);
			goto exit;
		}

		ret = u1_read_write_register(hdev, ADDRESS_U1_SP_BTN,
			&pri_data->sp_btn_info, 0, true);
		if (ret < 0) {
			dev_err(&hdev->dev, "failed U1_SP_BTN (%d)\n", ret);
			goto exit;
		}
		pri_data->has_sp = 1;
	}
	pri_data->max_fingers = 5;
exit:
	return ret;
}

static int T4_init(struct hid_device *hdev, struct alps_dev *pri_data)
{
	int ret;
	u8 tmp, sen_line_num_x, sen_line_num_y;

	ret = t4_read_write_register(hdev, T4_PRM_ID_CONFIG_3, &tmp, 0, true);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed T4_PRM_ID_CONFIG_3 (%d)\n", ret);
		goto exit;
	}
	sen_line_num_x = 16 + ((tmp & 0x0F)  | (tmp & 0x08 ? 0xF0 : 0));
	sen_line_num_y = 12 + (((tmp & 0xF0) >> 4)  | (tmp & 0x80 ? 0xF0 : 0));

	pri_data->x_max = sen_line_num_x * T4_COUNT_PER_ELECTRODE;
	pri_data->x_min = T4_COUNT_PER_ELECTRODE;
	pri_data->y_max = sen_line_num_y * T4_COUNT_PER_ELECTRODE;
	pri_data->y_min = T4_COUNT_PER_ELECTRODE;
	pri_data->x_active_len_mm = pri_data->y_active_len_mm = 0;
	pri_data->btn_cnt = 1;

	ret = t4_read_write_register(hdev, PRM_SYS_CONFIG_1, &tmp, 0, true);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed PRM_SYS_CONFIG_1 (%d)\n", ret);
		goto exit;
	}
	tmp |= 0x02;
	ret = t4_read_write_register(hdev, PRM_SYS_CONFIG_1, NULL, tmp, false);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed PRM_SYS_CONFIG_1 (%d)\n", ret);
		goto exit;
	}

	ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_1,
					NULL, T4_I2C_ABS, false);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_1 (%d)\n", ret);
		goto exit;
	}

	ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_4, NULL,
				T4_FEEDCFG4_ADVANCED_ABS_ENABLE, false);
	if (ret < 0) {
		dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_4 (%d)\n", ret);
		goto exit;
	}
	pri_data->max_fingers = 5;
	pri_data->has_sp = 0;
exit:
	return ret;
}

static int alps_sp_open(struct input_dev *dev)
{
	struct hid_device *hid = input_get_drvdata(dev);

	return hid_hw_open(hid);
}

static void alps_sp_close(struct input_dev *dev)
{
	struct hid_device *hid = input_get_drvdata(dev);

	hid_hw_close(hid);
}

static int alps_input_configured(struct hid_device *hdev, struct hid_input *hi)
{
	struct alps_dev *data = hid_get_drvdata(hdev);
	struct input_dev *input = hi->input, *input2;
	int ret;
	int res_x, res_y, i;

	data->input = input;

	hid_dbg(hdev, "Opening low level driver\n");
	ret = hid_hw_open(hdev);
	if (ret)
		return ret;

	/* Allow incoming hid reports */
	hid_device_io_start(hdev);
	switch (data->dev_type) {
	case T4:
		ret = T4_init(hdev, data);
		break;
	case U1:
		ret = u1_init(hdev, data);
		break;
	default:
		break;
	}

	if (ret)
		goto exit;

	__set_bit(EV_ABS, input->evbit);
	input_set_abs_params(input, ABS_MT_POSITION_X,
						data->x_min, data->x_max, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_Y,
						data->y_min, data->y_max, 0, 0);

	if (data->x_active_len_mm && data->y_active_len_mm) {
		res_x = (data->x_max - 1) / data->x_active_len_mm;
		res_y = (data->y_max - 1) / data->y_active_len_mm;

		input_abs_set_res(input, ABS_MT_POSITION_X, res_x);
		input_abs_set_res(input, ABS_MT_POSITION_Y, res_y);
	}

	input_set_abs_params(input, ABS_MT_PRESSURE, 0, 64, 0, 0);

	input_mt_init_slots(input, data->max_fingers, INPUT_MT_POINTER);

	__set_bit(EV_KEY, input->evbit);

	if (data->btn_cnt == 1)
		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);

	for (i = 0; i < data->btn_cnt; i++)
		__set_bit(BTN_LEFT + i, input->keybit);

	/* Stick device initialization */
	if (data->has_sp) {
		input2 = input_allocate_device();
		if (!input2) {
			ret = -ENOMEM;
			goto exit;
		}

		data->input2 = input2;
		input2->phys = input->phys;
		input2->name = "DualPoint Stick";
		input2->id.bustype = BUS_I2C;
		input2->id.vendor  = input->id.vendor;
		input2->id.product = input->id.product;
		input2->id.version = input->id.version;
		input2->dev.parent = input->dev.parent;

		input_set_drvdata(input2, hdev);
		input2->open = alps_sp_open;
		input2->close = alps_sp_close;

		__set_bit(EV_KEY, input2->evbit);
		data->sp_btn_cnt = (data->sp_btn_info & 0x0F);
		for (i = 0; i < data->sp_btn_cnt; i++)
			__set_bit(BTN_LEFT + i, input2->keybit);

		__set_bit(EV_REL, input2->evbit);
		__set_bit(REL_X, input2->relbit);
		__set_bit(REL_Y, input2->relbit);
		__set_bit(INPUT_PROP_POINTER, input2->propbit);
		__set_bit(INPUT_PROP_POINTING_STICK, input2->propbit);

		if (input_register_device(data->input2)) {
			input_free_device(input2);
			goto exit;
		}
	}

exit:
	hid_device_io_stop(hdev);
	hid_hw_close(hdev);
	return ret;
}

static int alps_input_mapping(struct hid_device *hdev,
		struct hid_input *hi, struct hid_field *field,
		struct hid_usage *usage, unsigned long **bit, int *max)
{
	return -1;
}

static int alps_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
	struct alps_dev *data = NULL;
	int ret;
	data = devm_kzalloc(&hdev->dev, sizeof(struct alps_dev), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->hdev = hdev;
	hid_set_drvdata(hdev, data);

	hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;

	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "parse failed\n");
		return ret;
	}

	switch (hdev->product) {
	case HID_DEVICE_ID_ALPS_T4_BTNLESS:
		data->dev_type = T4;
		break;
	case HID_DEVICE_ID_ALPS_U1_DUAL:
	case HID_DEVICE_ID_ALPS_U1:
	case HID_DEVICE_ID_ALPS_U1_UNICORN_LEGACY:
		data->dev_type = U1;
		break;
	default:
		data->dev_type = UNKNOWN;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	if (ret) {
		hid_err(hdev, "hw start failed\n");
		return ret;
	}

	return 0;
}

static void alps_remove(struct hid_device *hdev)
{
	hid_hw_stop(hdev);
}

static const struct hid_device_id alps_id[] = {
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY,
		USB_VENDOR_ID_ALPS_JP, HID_DEVICE_ID_ALPS_U1_DUAL) },
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY,
		USB_VENDOR_ID_ALPS_JP, HID_DEVICE_ID_ALPS_U1) },
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY,
		USB_VENDOR_ID_ALPS_JP, HID_DEVICE_ID_ALPS_T4_BTNLESS) },
	{ }
};
MODULE_DEVICE_TABLE(hid, alps_id);

static struct hid_driver alps_driver = {
	.name = "hid-alps",
	.id_table		= alps_id,
	.probe			= alps_probe,
	.remove			= alps_remove,
	.raw_event		= alps_raw_event,
	.input_mapping		= alps_input_mapping,
	.input_configured	= alps_input_configured,
#ifdef CONFIG_PM
	.resume			= alps_post_resume,
	.reset_resume		= alps_post_reset,
#endif
};

module_hid_driver(alps_driver);

MODULE_AUTHOR("Masaki Ota <masaki.ota@jp.alps.com>");
MODULE_DESCRIPTION("ALPS HID driver");
MODULE_LICENSE("GPL");