aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-corsair.c
blob: d8cf08b6b31c65dab3ef72dd1ea3a48377a59dda (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
/*
 * HID driver for Corsair devices
 *
 * Supported devices:
 *  - Vengeance K90 Keyboard
 *  - Scimitar PRO RGB Gaming Mouse
 *
 * Copyright (c) 2015 Clement Vuchener
 * Copyright (c) 2017 Oscar Campos
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/leds.h>

#include "hid-ids.h"

#define CORSAIR_USE_K90_MACRO	(1<<0)
#define CORSAIR_USE_K90_BACKLIGHT	(1<<1)

struct k90_led {
	struct led_classdev cdev;
	int brightness;
	struct work_struct work;
	bool removed;
};

struct k90_drvdata {
	struct k90_led record_led;
};

struct corsair_drvdata {
	unsigned long quirks;
	struct k90_drvdata *k90;
	struct k90_led *backlight;
};

#define K90_GKEY_COUNT	18

static int corsair_usage_to_gkey(unsigned int usage)
{
	/* G1 (0xd0) to G16 (0xdf) */
	if (usage >= 0xd0 && usage <= 0xdf)
		return usage - 0xd0 + 1;
	/* G17 (0xe8) to G18 (0xe9) */
	if (usage >= 0xe8 && usage <= 0xe9)
		return usage - 0xe8 + 17;
	return 0;
}

static unsigned short corsair_gkey_map[K90_GKEY_COUNT] = {
	BTN_TRIGGER_HAPPY1,
	BTN_TRIGGER_HAPPY2,
	BTN_TRIGGER_HAPPY3,
	BTN_TRIGGER_HAPPY4,
	BTN_TRIGGER_HAPPY5,
	BTN_TRIGGER_HAPPY6,
	BTN_TRIGGER_HAPPY7,
	BTN_TRIGGER_HAPPY8,
	BTN_TRIGGER_HAPPY9,
	BTN_TRIGGER_HAPPY10,
	BTN_TRIGGER_HAPPY11,
	BTN_TRIGGER_HAPPY12,
	BTN_TRIGGER_HAPPY13,
	BTN_TRIGGER_HAPPY14,
	BTN_TRIGGER_HAPPY15,
	BTN_TRIGGER_HAPPY16,
	BTN_TRIGGER_HAPPY17,
	BTN_TRIGGER_HAPPY18,
};

module_param_array_named(gkey_codes, corsair_gkey_map, ushort, NULL, S_IRUGO);
MODULE_PARM_DESC(gkey_codes, "Key codes for the G-keys");

static unsigned short corsair_record_keycodes[2] = {
	BTN_TRIGGER_HAPPY19,
	BTN_TRIGGER_HAPPY20
};

module_param_array_named(recordkey_codes, corsair_record_keycodes, ushort,
			 NULL, S_IRUGO);
MODULE_PARM_DESC(recordkey_codes, "Key codes for the MR (start and stop record) button");

static unsigned short corsair_profile_keycodes[3] = {
	BTN_TRIGGER_HAPPY21,
	BTN_TRIGGER_HAPPY22,
	BTN_TRIGGER_HAPPY23
};

module_param_array_named(profilekey_codes, corsair_profile_keycodes, ushort,
			 NULL, S_IRUGO);
MODULE_PARM_DESC(profilekey_codes, "Key codes for the profile buttons");

#define CORSAIR_USAGE_SPECIAL_MIN 0xf0
#define CORSAIR_USAGE_SPECIAL_MAX 0xff

#define CORSAIR_USAGE_MACRO_RECORD_START 0xf6
#define CORSAIR_USAGE_MACRO_RECORD_STOP 0xf7

#define CORSAIR_USAGE_PROFILE 0xf1
#define CORSAIR_USAGE_M1 0xf1
#define CORSAIR_USAGE_M2 0xf2
#define CORSAIR_USAGE_M3 0xf3
#define CORSAIR_USAGE_PROFILE_MAX 0xf3

#define CORSAIR_USAGE_META_OFF 0xf4
#define CORSAIR_USAGE_META_ON  0xf5

#define CORSAIR_USAGE_LIGHT 0xfa
#define CORSAIR_USAGE_LIGHT_OFF 0xfa
#define CORSAIR_USAGE_LIGHT_DIM 0xfb
#define CORSAIR_USAGE_LIGHT_MEDIUM 0xfc
#define CORSAIR_USAGE_LIGHT_BRIGHT 0xfd
#define CORSAIR_USAGE_LIGHT_MAX 0xfd

/* USB control protocol */

#define K90_REQUEST_BRIGHTNESS 49
#define K90_REQUEST_MACRO_MODE 2
#define K90_REQUEST_STATUS 4
#define K90_REQUEST_GET_MODE 5
#define K90_REQUEST_PROFILE 20

#define K90_MACRO_MODE_SW 0x0030
#define K90_MACRO_MODE_HW 0x0001

#define K90_MACRO_LED_ON  0x0020
#define K90_MACRO_LED_OFF 0x0040

/*
 * LED class devices
 */

#define K90_BACKLIGHT_LED_SUFFIX "::backlight"
#define K90_RECORD_LED_SUFFIX "::record"

static enum led_brightness k90_backlight_get(struct led_classdev *led_cdev)
{
	int ret;
	struct k90_led *led = container_of(led_cdev, struct k90_led, cdev);
	struct device *dev = led->cdev.dev->parent;
	struct usb_interface *usbif = to_usb_interface(dev->parent);
	struct usb_device *usbdev = interface_to_usbdev(usbif);
	int brightness;
	char *data;

	data = kmalloc(8, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
			      K90_REQUEST_STATUS,
			      USB_DIR_IN | USB_TYPE_VENDOR |
			      USB_RECIP_DEVICE, 0, 0, data, 8,
			      USB_CTRL_SET_TIMEOUT);
	if (ret < 5) {
		dev_warn(dev, "Failed to get K90 initial state (error %d).\n",
			 ret);
		ret = -EIO;
		goto out;
	}
	brightness = data[4];
	if (brightness < 0 || brightness > 3) {
		dev_warn(dev,
			 "Read invalid backlight brightness: %02hhx.\n",
			 data[4]);
		ret = -EIO;
		goto out;
	}
	ret = brightness;
out:
	kfree(data);

	return ret;
}

static enum led_brightness k90_record_led_get(struct led_classdev *led_cdev)
{
	struct k90_led *led = container_of(led_cdev, struct k90_led, cdev);

	return led->brightness;
}

static void k90_brightness_set(struct led_classdev *led_cdev,
			       enum led_brightness brightness)
{
	struct k90_led *led = container_of(led_cdev, struct k90_led, cdev);

	led->brightness = brightness;
	schedule_work(&led->work);
}

static void k90_backlight_work(struct work_struct *work)
{
	int ret;
	struct k90_led *led = container_of(work, struct k90_led, work);
	struct device *dev;
	struct usb_interface *usbif;
	struct usb_device *usbdev;

	if (led->removed)
		return;

	dev = led->cdev.dev->parent;
	usbif = to_usb_interface(dev->parent);
	usbdev = interface_to_usbdev(usbif);

	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0),
			      K90_REQUEST_BRIGHTNESS,
			      USB_DIR_OUT | USB_TYPE_VENDOR |
			      USB_RECIP_DEVICE, led->brightness, 0,
			      NULL, 0, USB_CTRL_SET_TIMEOUT);
	if (ret != 0)
		dev_warn(dev, "Failed to set backlight brightness (error: %d).\n",
			 ret);
}

static void k90_record_led_work(struct work_struct *work)
{
	int ret;
	struct k90_led *led = container_of(work, struct k90_led, work);
	struct device *dev;
	struct usb_interface *usbif;
	struct usb_device *usbdev;
	int value;

	if (led->removed)
		return;

	dev = led->cdev.dev->parent;
	usbif = to_usb_interface(dev->parent);
	usbdev = interface_to_usbdev(usbif);

	if (led->brightness > 0)
		value = K90_MACRO_LED_ON;
	else
		value = K90_MACRO_LED_OFF;

	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0),
			      K90_REQUEST_MACRO_MODE,
			      USB_DIR_OUT | USB_TYPE_VENDOR |
			      USB_RECIP_DEVICE, value, 0, NULL, 0,
			      USB_CTRL_SET_TIMEOUT);
	if (ret != 0)
		dev_warn(dev, "Failed to set record LED state (error: %d).\n",
			 ret);
}

/*
 * Keyboard attributes
 */

static ssize_t k90_show_macro_mode(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	int ret;
	struct usb_interface *usbif = to_usb_interface(dev->parent);
	struct usb_device *usbdev = interface_to_usbdev(usbif);
	const char *macro_mode;
	char *data;

	data = kmalloc(2, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
			      K90_REQUEST_GET_MODE,
			      USB_DIR_IN | USB_TYPE_VENDOR |
			      USB_RECIP_DEVICE, 0, 0, data, 2,
			      USB_CTRL_SET_TIMEOUT);
	if (ret < 1) {
		dev_warn(dev, "Failed to get K90 initial mode (error %d).\n",
			 ret);
		ret = -EIO;
		goto out;
	}

	switch (data[0]) {
	case K90_MACRO_MODE_HW:
		macro_mode = "HW";
		break;

	case K90_MACRO_MODE_SW:
		macro_mode = "SW";
		break;
	default:
		dev_warn(dev, "K90 in unknown mode: %02hhx.\n",
			 data[0]);
		ret = -EIO;
		goto out;
	}

	ret = snprintf(buf, PAGE_SIZE, "%s\n", macro_mode);
out:
	kfree(data);

	return ret;
}

static ssize_t k90_store_macro_mode(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	int ret;
	struct usb_interface *usbif = to_usb_interface(dev->parent);
	struct usb_device *usbdev = interface_to_usbdev(usbif);
	__u16 value;

	if (strncmp(buf, "SW", 2) == 0)
		value = K90_MACRO_MODE_SW;
	else if (strncmp(buf, "HW", 2) == 0)
		value = K90_MACRO_MODE_HW;
	else
		return -EINVAL;

	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0),
			      K90_REQUEST_MACRO_MODE,
			      USB_DIR_OUT | USB_TYPE_VENDOR |
			      USB_RECIP_DEVICE, value, 0, NULL, 0,
			      USB_CTRL_SET_TIMEOUT);
	if (ret != 0) {
		dev_warn(dev, "Failed to set macro mode.\n");
		return ret;
	}

	return count;
}

static ssize_t k90_show_current_profile(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	int ret;
	struct usb_interface *usbif = to_usb_interface(dev->parent);
	struct usb_device *usbdev = interface_to_usbdev(usbif);
	int current_profile;
	char *data;

	data = kmalloc(8, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
			      K90_REQUEST_STATUS,
			      USB_DIR_IN | USB_TYPE_VENDOR |
			      USB_RECIP_DEVICE, 0, 0, data, 8,
			      USB_CTRL_SET_TIMEOUT);
	if (ret < 8) {
		dev_warn(dev, "Failed to get K90 initial state (error %d).\n",
			 ret);
		ret = -EIO;
		goto out;
	}
	current_profile = data[7];
	if (current_profile < 1 || current_profile > 3) {
		dev_warn(dev, "Read invalid current profile: %02hhx.\n",
			 data[7]);
		ret = -EIO;
		goto out;
	}

	ret = snprintf(buf, PAGE_SIZE, "%d\n", current_profile);
out:
	kfree(data);

	return ret;
}

static ssize_t k90_store_current_profile(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t count)
{
	int ret;
	struct usb_interface *usbif = to_usb_interface(dev->parent);
	struct usb_device *usbdev = interface_to_usbdev(usbif);
	int profile;

	if (kstrtoint(buf, 10, &profile))
		return -EINVAL;
	if (profile < 1 || profile > 3)
		return -EINVAL;

	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0),
			      K90_REQUEST_PROFILE,
			      USB_DIR_OUT | USB_TYPE_VENDOR |
			      USB_RECIP_DEVICE, profile, 0, NULL, 0,
			      USB_CTRL_SET_TIMEOUT);
	if (ret != 0) {
		dev_warn(dev, "Failed to change current profile (error %d).\n",
			 ret);
		return ret;
	}

	return count;
}

static DEVICE_ATTR(macro_mode, 0644, k90_show_macro_mode, k90_store_macro_mode);
static DEVICE_ATTR(current_profile, 0644, k90_show_current_profile,
		   k90_store_current_profile);

static struct attribute *k90_attrs[] = {
	&dev_attr_macro_mode.attr,
	&dev_attr_current_profile.attr,
	NULL
};

static const struct attribute_group k90_attr_group = {
	.attrs = k90_attrs,
};

/*
 * Driver functions
 */

static int k90_init_backlight(struct hid_device *dev)
{
	int ret;
	struct corsair_drvdata *drvdata = hid_get_drvdata(dev);
	size_t name_sz;
	char *name;

	drvdata->backlight = kzalloc(sizeof(struct k90_led), GFP_KERNEL);
	if (!drvdata->backlight) {
		ret = -ENOMEM;
		goto fail_backlight_alloc;
	}

	name_sz =
	    strlen(dev_name(&dev->dev)) + sizeof(K90_BACKLIGHT_LED_SUFFIX);
	name = kzalloc(name_sz, GFP_KERNEL);
	if (!name) {
		ret = -ENOMEM;
		goto fail_name_alloc;
	}
	snprintf(name, name_sz, "%s" K90_BACKLIGHT_LED_SUFFIX,
		 dev_name(&dev->dev));
	drvdata->backlight->removed = false;
	drvdata->backlight->cdev.name = name;
	drvdata->backlight->cdev.max_brightness = 3;
	drvdata->backlight->cdev.brightness_set = k90_brightness_set;
	drvdata->backlight->cdev.brightness_get = k90_backlight_get;
	INIT_WORK(&drvdata->backlight->work, k90_backlight_work);
	ret = led_classdev_register(&dev->dev, &drvdata->backlight->cdev);
	if (ret != 0)
		goto fail_register_cdev;

	return 0;

fail_register_cdev:
	kfree(drvdata->backlight->cdev.name);
fail_name_alloc:
	kfree(drvdata->backlight);
	drvdata->backlight = NULL;
fail_backlight_alloc:
	return ret;
}

static int k90_init_macro_functions(struct hid_device *dev)
{
	int ret;
	struct corsair_drvdata *drvdata = hid_get_drvdata(dev);
	struct k90_drvdata *k90;
	size_t name_sz;
	char *name;

	k90 = kzalloc(sizeof(struct k90_drvdata), GFP_KERNEL);
	if (!k90) {
		ret = -ENOMEM;
		goto fail_drvdata;
	}
	drvdata->k90 = k90;

	/* Init LED device for record LED */
	name_sz = strlen(dev_name(&dev->dev)) + sizeof(K90_RECORD_LED_SUFFIX);
	name = kzalloc(name_sz, GFP_KERNEL);
	if (!name) {
		ret = -ENOMEM;
		goto fail_record_led_alloc;
	}
	snprintf(name, name_sz, "%s" K90_RECORD_LED_SUFFIX,
		 dev_name(&dev->dev));
	k90->record_led.removed = false;
	k90->record_led.cdev.name = name;
	k90->record_led.cdev.max_brightness = 1;
	k90->record_led.cdev.brightness_set = k90_brightness_set;
	k90->record_led.cdev.brightness_get = k90_record_led_get;
	INIT_WORK(&k90->record_led.work, k90_record_led_work);
	k90->record_led.brightness = 0;
	ret = led_classdev_register(&dev->dev, &k90->record_led.cdev);
	if (ret != 0)
		goto fail_record_led;

	/* Init attributes */
	ret = sysfs_create_group(&dev->dev.kobj, &k90_attr_group);
	if (ret != 0)
		goto fail_sysfs;

	return 0;

fail_sysfs:
	k90->record_led.removed = true;
	led_classdev_unregister(&k90->record_led.cdev);
	cancel_work_sync(&k90->record_led.work);
fail_record_led:
	kfree(k90->record_led.cdev.name);
fail_record_led_alloc:
	kfree(k90);
fail_drvdata:
	drvdata->k90 = NULL;
	return ret;
}

static void k90_cleanup_backlight(struct hid_device *dev)
{
	struct corsair_drvdata *drvdata = hid_get_drvdata(dev);

	if (drvdata->backlight) {
		drvdata->backlight->removed = true;
		led_classdev_unregister(&drvdata->backlight->cdev);
		cancel_work_sync(&drvdata->backlight->work);
		kfree(drvdata->backlight->cdev.name);
		kfree(drvdata->backlight);
	}
}

static void k90_cleanup_macro_functions(struct hid_device *dev)
{
	struct corsair_drvdata *drvdata = hid_get_drvdata(dev);
	struct k90_drvdata *k90 = drvdata->k90;

	if (k90) {
		sysfs_remove_group(&dev->dev.kobj, &k90_attr_group);

		k90->record_led.removed = true;
		led_classdev_unregister(&k90->record_led.cdev);
		cancel_work_sync(&k90->record_led.work);
		kfree(k90->record_led.cdev.name);

		kfree(k90);
	}
}

static int corsair_probe(struct hid_device *dev, const struct hid_device_id *id)
{
	int ret;
	unsigned long quirks = id->driver_data;
	struct corsair_drvdata *drvdata;
	struct usb_interface *usbif;

	if (!hid_is_usb(dev))
		return -EINVAL;

	usbif = to_usb_interface(dev->dev.parent);

	drvdata = devm_kzalloc(&dev->dev, sizeof(struct corsair_drvdata),
			       GFP_KERNEL);
	if (drvdata == NULL)
		return -ENOMEM;
	drvdata->quirks = quirks;
	hid_set_drvdata(dev, drvdata);

	ret = hid_parse(dev);
	if (ret != 0) {
		hid_err(dev, "parse failed\n");
		return ret;
	}
	ret = hid_hw_start(dev, HID_CONNECT_DEFAULT);
	if (ret != 0) {
		hid_err(dev, "hw start failed\n");
		return ret;
	}

	if (usbif->cur_altsetting->desc.bInterfaceNumber == 0) {
		if (quirks & CORSAIR_USE_K90_MACRO) {
			ret = k90_init_macro_functions(dev);
			if (ret != 0)
				hid_warn(dev, "Failed to initialize K90 macro functions.\n");
		}
		if (quirks & CORSAIR_USE_K90_BACKLIGHT) {
			ret = k90_init_backlight(dev);
			if (ret != 0)
				hid_warn(dev, "Failed to initialize K90 backlight.\n");
		}
	}

	return 0;
}

static void corsair_remove(struct hid_device *dev)
{
	k90_cleanup_macro_functions(dev);
	k90_cleanup_backlight(dev);

	hid_hw_stop(dev);
}

static int corsair_event(struct hid_device *dev, struct hid_field *field,
			 struct hid_usage *usage, __s32 value)
{
	struct corsair_drvdata *drvdata = hid_get_drvdata(dev);

	if (!drvdata->k90)
		return 0;

	switch (usage->hid & HID_USAGE) {
	case CORSAIR_USAGE_MACRO_RECORD_START:
		drvdata->k90->record_led.brightness = 1;
		break;
	case CORSAIR_USAGE_MACRO_RECORD_STOP:
		drvdata->k90->record_led.brightness = 0;
		break;
	default:
		break;
	}

	return 0;
}

static int corsair_input_mapping(struct hid_device *dev,
				 struct hid_input *input,
				 struct hid_field *field,
				 struct hid_usage *usage, unsigned long **bit,
				 int *max)
{
	int gkey;

	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_KEYBOARD)
		return 0;

	gkey = corsair_usage_to_gkey(usage->hid & HID_USAGE);
	if (gkey != 0) {
		hid_map_usage_clear(input, usage, bit, max, EV_KEY,
				    corsair_gkey_map[gkey - 1]);
		return 1;
	}
	if ((usage->hid & HID_USAGE) >= CORSAIR_USAGE_SPECIAL_MIN &&
	    (usage->hid & HID_USAGE) <= CORSAIR_USAGE_SPECIAL_MAX) {
		switch (usage->hid & HID_USAGE) {
		case CORSAIR_USAGE_MACRO_RECORD_START:
			hid_map_usage_clear(input, usage, bit, max, EV_KEY,
					    corsair_record_keycodes[0]);
			return 1;

		case CORSAIR_USAGE_MACRO_RECORD_STOP:
			hid_map_usage_clear(input, usage, bit, max, EV_KEY,
					    corsair_record_keycodes[1]);
			return 1;

		case CORSAIR_USAGE_M1:
			hid_map_usage_clear(input, usage, bit, max, EV_KEY,
					    corsair_profile_keycodes[0]);
			return 1;

		case CORSAIR_USAGE_M2:
			hid_map_usage_clear(input, usage, bit, max, EV_KEY,
					    corsair_profile_keycodes[1]);
			return 1;

		case CORSAIR_USAGE_M3:
			hid_map_usage_clear(input, usage, bit, max, EV_KEY,
					    corsair_profile_keycodes[2]);
			return 1;

		default:
			return -1;
		}
	}

	return 0;
}

/*
 * The report descriptor of Corsair Scimitar RGB Pro gaming mouse is
 * non parseable as they define two consecutive Logical Minimum for
 * the Usage Page (Consumer) in rdescs bytes 75 and 77 being 77 0x16
 * that should be obviousy 0x26 for Logical Magimum of 16 bits. This
 * prevents poper parsing of the report descriptor due Logical
 * Minimum being larger than Logical Maximum.
 *
 * This driver fixes the report descriptor for:
 * - USB ID b1c:1b3e, sold as Scimitar RGB Pro Gaming mouse
 */

static __u8 *corsair_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc,
        unsigned int *rsize)
{
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);

	if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
		/*
		 * Corsair Scimitar RGB Pro report descriptor is broken and
		 * defines two different Logical Minimum for the Consumer
		 * Application. The byte 77 should be a 0x26 defining a 16
		 * bits integer for the Logical Maximum but it is a 0x16
		 * instead (Logical Minimum)
		 */
		switch (hdev->product) {
		case USB_DEVICE_ID_CORSAIR_SCIMITAR_PRO_RGB:
			if (*rsize >= 172 && rdesc[75] == 0x15 && rdesc[77] == 0x16
			&& rdesc[78] == 0xff && rdesc[79] == 0x0f) {
				hid_info(hdev, "Fixing up report descriptor\n");
				rdesc[77] = 0x26;
			}
			break;
		}

	}
	return rdesc;
}

static const struct hid_device_id corsair_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_DEVICE_ID_CORSAIR_K90),
		.driver_data = CORSAIR_USE_K90_MACRO |
			       CORSAIR_USE_K90_BACKLIGHT },
	{ HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR,
            USB_DEVICE_ID_CORSAIR_SCIMITAR_PRO_RGB) },
	{}
};

MODULE_DEVICE_TABLE(hid, corsair_devices);

static struct hid_driver corsair_driver = {
	.name = "corsair",
	.id_table = corsair_devices,
	.probe = corsair_probe,
	.event = corsair_event,
	.remove = corsair_remove,
	.input_mapping = corsair_input_mapping,
	.report_fixup = corsair_mouse_report_fixup,
};

module_hid_driver(corsair_driver);

MODULE_LICENSE("GPL");
/* Original K90 driver author */
MODULE_AUTHOR("Clement Vuchener");
/* Scimitar PRO RGB driver author */
MODULE_AUTHOR("Oscar Campos");
MODULE_DESCRIPTION("HID driver for Corsair devices");