summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-lg4ff.c
blob: 24883b4d1a49d40a2bb3462ee36ed094f474b3cd (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
/*
 *  Force feedback support for Logitech Gaming Wheels
 *
 *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
 *  Speed Force Wireless (WiiWheel)
 *
 *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
 */

/*
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */


#include <linux/input.h>
#include <linux/usb.h>
#include <linux/hid.h>

#include "usbhid/usbhid.h"
#include "hid-lg.h"
#include "hid-ids.h"

#define DFGT_REV_MAJ 0x13
#define DFGT_REV_MIN 0x22
#define DFGT2_REV_MIN 0x26
#define DFP_REV_MAJ 0x11
#define DFP_REV_MIN 0x06
#define FFEX_REV_MAJ 0x21
#define FFEX_REV_MIN 0x00
#define G25_REV_MAJ 0x12
#define G25_REV_MIN 0x22
#define G27_REV_MAJ 0x12
#define G27_REV_MIN 0x38
#define G27_2_REV_MIN 0x39

#define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)

static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);

static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);

struct lg4ff_device_entry {
	__u32 product_id;
	__u16 range;
	__u16 min_range;
	__u16 max_range;
#ifdef CONFIG_LEDS_CLASS
	__u8  led_state;
	struct led_classdev *led[5];
#endif
	struct list_head list;
	void (*set_range)(struct hid_device *hid, u16 range);
};

static const signed short lg4ff_wheel_effects[] = {
	FF_CONSTANT,
	FF_AUTOCENTER,
	-1
};

struct lg4ff_wheel {
	const __u32 product_id;
	const signed short *ff_effects;
	const __u16 min_range;
	const __u16 max_range;
	void (*set_range)(struct hid_device *hid, u16 range);
};

static const struct lg4ff_wheel lg4ff_devices[] = {
	{USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
	{USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
	{USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
	{USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
	{USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
	{USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
};

struct lg4ff_native_cmd {
	const __u8 cmd_num;	/* Number of commands to send */
	const __u8 cmd[];
};

struct lg4ff_usb_revision {
	const __u16 rev_maj;
	const __u16 rev_min;
	const struct lg4ff_native_cmd *command;
};

static const struct lg4ff_native_cmd native_dfp = {
	1,
	{0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
};

static const struct lg4ff_native_cmd native_dfgt = {
	2,
	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* 1st command */
	 0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}	/* 2nd command */
};

static const struct lg4ff_native_cmd native_g25 = {
	1,
	{0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
};

static const struct lg4ff_native_cmd native_g27 = {
	2,
	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* 1st command */
	 0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}	/* 2nd command */
};

static const struct lg4ff_usb_revision lg4ff_revs[] = {
	{DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt},	/* Driving Force GT */
	{DFGT_REV_MAJ, DFGT2_REV_MIN, &native_dfgt},	/* Driving Force GT v2 */
	{DFP_REV_MAJ,  DFP_REV_MIN,  &native_dfp},	/* Driving Force Pro */
	{G25_REV_MAJ,  G25_REV_MIN,  &native_g25},	/* G25 */
	{G27_REV_MAJ,  G27_REV_MIN,  &native_g27},	/* G27 */
	{G27_REV_MAJ,  G27_2_REV_MIN,  &native_g27},	/* G27 v2 */
};

/* Recalculates X axis value accordingly to currently selected range */
static __s32 lg4ff_adjust_dfp_x_axis(__s32 value, __u16 range)
{
	__u16 max_range;
	__s32 new_value;

	if (range == 900)
		return value;
	else if (range == 200)
		return value;
	else if (range < 200)
		max_range = 200;
	else
		max_range = 900;

	new_value = 8192 + mult_frac(value - 8192, max_range, range);
	if (new_value < 0)
		return 0;
	else if (new_value > 16383)
		return 16383;
	else
		return new_value;
}

int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
			     struct hid_usage *usage, __s32 value, struct lg_drv_data *drv_data)
{
	struct lg4ff_device_entry *entry = drv_data->device_props;
	__s32 new_value = 0;

	if (!entry) {
		hid_err(hid, "Device properties not found");
		return 0;
	}

	switch (entry->product_id) {
	case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
		switch (usage->code) {
		case ABS_X:
			new_value = lg4ff_adjust_dfp_x_axis(value, entry->range);
			input_event(field->hidinput->input, usage->type, usage->code, new_value);
			return 1;
		default:
			return 0;
		}
	default:
		return 0;
	}
}

static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;
	int x;

#define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)

	switch (effect->type) {
	case FF_CONSTANT:
		x = effect->u.ramp.start_level + 0x80;	/* 0x80 is no force */
		CLAMP(x);

		if (x == 0x80) {
			/* De-activate force in slot-1*/
			value[0] = 0x13;
			value[1] = 0x00;
			value[2] = 0x00;
			value[3] = 0x00;
			value[4] = 0x00;
			value[5] = 0x00;
			value[6] = 0x00;

			hid_hw_request(hid, report, HID_REQ_SET_REPORT);
			return 0;
		}

		value[0] = 0x11;	/* Slot 1 */
		value[1] = 0x08;
		value[2] = x;
		value[3] = 0x80;
		value[4] = 0x00;
		value[5] = 0x00;
		value[6] = 0x00;

		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
		break;
	}
	return 0;
}

/* Sends default autocentering command compatible with
 * all wheels except Formula Force EX */
static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;
	__u32 expand_a, expand_b;
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return;
	}

	/* De-activate Auto-Center */
	if (magnitude == 0) {
		value[0] = 0xf5;
		value[1] = 0x00;
		value[2] = 0x00;
		value[3] = 0x00;
		value[4] = 0x00;
		value[5] = 0x00;
		value[6] = 0x00;

		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
		return;
	}

	if (magnitude <= 0xaaaa) {
		expand_a = 0x0c * magnitude;
		expand_b = 0x80 * magnitude;
	} else {
		expand_a = (0x0c * 0xaaaa) + 0x06 * (magnitude - 0xaaaa);
		expand_b = (0x80 * 0xaaaa) + 0xff * (magnitude - 0xaaaa);
	}

	/* Adjust for non-MOMO wheels */
	switch (entry->product_id) {
	case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
	case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
		break;
	default:
		expand_a = expand_a >> 1;
		break;
	}

	value[0] = 0xfe;
	value[1] = 0x0d;
	value[2] = expand_a / 0xaaaa;
	value[3] = expand_a / 0xaaaa;
	value[4] = expand_b / 0xaaaa;
	value[5] = 0x00;
	value[6] = 0x00;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);

	/* Activate Auto-Center */
	value[0] = 0x14;
	value[1] = 0x00;
	value[2] = 0x00;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
}

/* Sends autocentering command compatible with Formula Force EX */
static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;
	magnitude = magnitude * 90 / 65535;

	value[0] = 0xfe;
	value[1] = 0x03;
	value[2] = magnitude >> 14;
	value[3] = magnitude >> 14;
	value[4] = magnitude;
	value[5] = 0x00;
	value[6] = 0x00;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
}

/* Sends command to set range compatible with G25/G27/Driving Force GT */
static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
{
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;

	dbg_hid("G25/G27/DFGT: setting range to %u\n", range);

	value[0] = 0xf8;
	value[1] = 0x81;
	value[2] = range & 0x00ff;
	value[3] = (range & 0xff00) >> 8;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
}

/* Sends commands to set range compatible with Driving Force Pro wheel */
static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
{
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	int start_left, start_right, full_range;
	__s32 *value = report->field[0]->value;

	dbg_hid("Driving Force Pro: setting range to %u\n", range);

	/* Prepare "coarse" limit command */
	value[0] = 0xf8;
	value[1] = 0x00;	/* Set later */
	value[2] = 0x00;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;

	if (range > 200) {
		report->field[0]->value[1] = 0x03;
		full_range = 900;
	} else {
		report->field[0]->value[1] = 0x02;
		full_range = 200;
	}
	hid_hw_request(hid, report, HID_REQ_SET_REPORT);

	/* Prepare "fine" limit command */
	value[0] = 0x81;
	value[1] = 0x0b;
	value[2] = 0x00;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;

	if (range == 200 || range == 900) {	/* Do not apply any fine limit */
		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
		return;
	}

	/* Construct fine limit command */
	start_left = (((full_range - range + 1) * 2047) / full_range);
	start_right = 0xfff - start_left;

	value[2] = start_left >> 4;
	value[3] = start_right >> 4;
	value[4] = 0xff;
	value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
	value[6] = 0xff;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
}

static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
{
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__u8 i, j;

	j = 0;
	while (j < 7*cmd->cmd_num) {
		for (i = 0; i < 7; i++)
			report->field[0]->value[i] = cmd->cmd[j++];

		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
	}
}

/* Read current range and display it in terminal */
static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct hid_device *hid = to_hid_device(dev);
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	size_t count;

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return 0;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return 0;
	}

	count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
	return count;
}

/* Set range to user specified value, call appropriate function
 * according to the type of the wheel */
static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct hid_device *hid = to_hid_device(dev);
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	__u16 range = simple_strtoul(buf, NULL, 10);

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Private driver data not found!\n");
		return 0;
	}

	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Device properties not found!\n");
		return 0;
	}

	if (range == 0)
		range = entry->max_range;

	/* Check if the wheel supports range setting
	 * and that the range is within limits for the wheel */
	if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
		entry->set_range(hid, range);
		entry->range = range;
	}

	return count;
}

#ifdef CONFIG_LEDS_CLASS
static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
{
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;

	value[0] = 0xf8;
	value[1] = 0x12;
	value[2] = leds;
	value[3] = 0x00;
	value[4] = 0x00;
	value[5] = 0x00;
	value[6] = 0x00;
	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
}

static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
			enum led_brightness value)
{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hid = container_of(dev, struct hid_device, dev);
	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
	struct lg4ff_device_entry *entry;
	int i, state = 0;

	if (!drv_data) {
		hid_err(hid, "Device data not found.");
		return;
	}

	entry = (struct lg4ff_device_entry *)drv_data->device_props;

	if (!entry) {
		hid_err(hid, "Device properties not found.");
		return;
	}

	for (i = 0; i < 5; i++) {
		if (led_cdev != entry->led[i])
			continue;
		state = (entry->led_state >> i) & 1;
		if (value == LED_OFF && state) {
			entry->led_state &= ~(1 << i);
			lg4ff_set_leds(hid, entry->led_state);
		} else if (value != LED_OFF && !state) {
			entry->led_state |= 1 << i;
			lg4ff_set_leds(hid, entry->led_state);
		}
		break;
	}
}

static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hid = container_of(dev, struct hid_device, dev);
	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
	struct lg4ff_device_entry *entry;
	int i, value = 0;

	if (!drv_data) {
		hid_err(hid, "Device data not found.");
		return LED_OFF;
	}

	entry = (struct lg4ff_device_entry *)drv_data->device_props;

	if (!entry) {
		hid_err(hid, "Device properties not found.");
		return LED_OFF;
	}

	for (i = 0; i < 5; i++)
		if (led_cdev == entry->led[i]) {
			value = (entry->led_state >> i) & 1;
			break;
		}

	return value ? LED_FULL : LED_OFF;
}
#endif

int lg4ff_init(struct hid_device *hid)
{
	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
	struct input_dev *dev = hidinput->input;
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;
	struct usb_device_descriptor *udesc;
	int error, i, j;
	__u16 bcdDevice, rev_maj, rev_min;

	/* Check that the report looks ok */
	if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
		return -1;

	/* Check what wheel has been connected */
	for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
		if (hid->product == lg4ff_devices[i].product_id) {
			dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
			break;
		}
	}

	if (i == ARRAY_SIZE(lg4ff_devices)) {
		hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
			     "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
		return -1;
	}

	/* Attempt to switch wheel to native mode when applicable */
	udesc = &(hid_to_usb_dev(hid)->descriptor);
	if (!udesc) {
		hid_err(hid, "NULL USB device descriptor\n");
		return -1;
	}
	bcdDevice = le16_to_cpu(udesc->bcdDevice);
	rev_maj = bcdDevice >> 8;
	rev_min = bcdDevice & 0xff;

	if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
		dbg_hid("Generic wheel detected, can it do native?\n");
		dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);

		for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
			if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
				hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
				hid_info(hid, "Switched to native mode\n");
			}
		}
	}

	/* Set supported force feedback capabilities */
	for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
		set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);

	error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);

	if (error)
		return error;

	/* Get private driver data */
	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Cannot add device, private driver data not allocated\n");
		return -1;
	}

	/* Initialize device properties */
	entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
	if (!entry) {
		hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
		return -ENOMEM;
	}
	drv_data->device_props = entry;

	entry->product_id = lg4ff_devices[i].product_id;
	entry->min_range = lg4ff_devices[i].min_range;
	entry->max_range = lg4ff_devices[i].max_range;
	entry->set_range = lg4ff_devices[i].set_range;

	/* Check if autocentering is available and
	 * set the centering force to zero by default */
	if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
		if (rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN)	/* Formula Force EX expects different autocentering command */
			dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
		else
			dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;

		dev->ff->set_autocenter(dev, 0);
	}

	/* Create sysfs interface */
	error = device_create_file(&hid->dev, &dev_attr_range);
	if (error)
		return error;
	dbg_hid("sysfs interface created\n");

	/* Set the maximum range to start with */
	entry->range = entry->max_range;
	if (entry->set_range != NULL)
		entry->set_range(hid, entry->range);

#ifdef CONFIG_LEDS_CLASS
	/* register led subsystem - G27 only */
	entry->led_state = 0;
	for (j = 0; j < 5; j++)
		entry->led[j] = NULL;

	if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
		struct led_classdev *led;
		size_t name_sz;
		char *name;

		lg4ff_set_leds(hid, 0);

		name_sz = strlen(dev_name(&hid->dev)) + 8;

		for (j = 0; j < 5; j++) {
			led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
			if (!led) {
				hid_err(hid, "can't allocate memory for LED %d\n", j);
				goto err;
			}

			name = (void *)(&led[1]);
			snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
			led->name = name;
			led->brightness = 0;
			led->max_brightness = 1;
			led->brightness_get = lg4ff_led_get_brightness;
			led->brightness_set = lg4ff_led_set_brightness;

			entry->led[j] = led;
			error = led_classdev_register(&hid->dev, led);

			if (error) {
				hid_err(hid, "failed to register LED %d. Aborting.\n", j);
err:
				/* Deregister LEDs (if any) */
				for (j = 0; j < 5; j++) {
					led = entry->led[j];
					entry->led[j] = NULL;
					if (!led)
						continue;
					led_classdev_unregister(led);
					kfree(led);
				}
				goto out;	/* Let the driver continue without LEDs */
			}
		}
	}
out:
#endif
	hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
	return 0;
}



int lg4ff_deinit(struct hid_device *hid)
{
	struct lg4ff_device_entry *entry;
	struct lg_drv_data *drv_data;

	device_remove_file(&hid->dev, &dev_attr_range);

	drv_data = hid_get_drvdata(hid);
	if (!drv_data) {
		hid_err(hid, "Error while deinitializing device, no private driver data.\n");
		return -1;
	}
	entry = drv_data->device_props;
	if (!entry) {
		hid_err(hid, "Error while deinitializing device, no device properties data.\n");
		return -1;
	}

#ifdef CONFIG_LEDS_CLASS
	{
		int j;
		struct led_classdev *led;

		/* Deregister LEDs (if any) */
		for (j = 0; j < 5; j++) {

			led = entry->led[j];
			entry->led[j] = NULL;
			if (!led)
				continue;
			led_classdev_unregister(led);
			kfree(led);
		}
	}
#endif

	/* Deallocate memory */
	kfree(entry);

	dbg_hid("Device successfully unregistered\n");
	return 0;
}
OpenPOWER on IntegriCloud