xref: /openbmc/linux/drivers/hid/hid-lg4ff.c (revision b34e08d5)
1 /*
2  *  Force feedback support for Logitech Gaming Wheels
3  *
4  *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
5  *  Speed Force Wireless (WiiWheel)
6  *
7  *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
8  */
9 
10 /*
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24  */
25 
26 
27 #include <linux/input.h>
28 #include <linux/usb.h>
29 #include <linux/hid.h>
30 
31 #include "usbhid/usbhid.h"
32 #include "hid-lg.h"
33 #include "hid-ids.h"
34 
35 #define DFGT_REV_MAJ 0x13
36 #define DFGT_REV_MIN 0x22
37 #define DFGT2_REV_MIN 0x26
38 #define DFP_REV_MAJ 0x11
39 #define DFP_REV_MIN 0x06
40 #define FFEX_REV_MAJ 0x21
41 #define FFEX_REV_MIN 0x00
42 #define G25_REV_MAJ 0x12
43 #define G25_REV_MIN 0x22
44 #define G27_REV_MAJ 0x12
45 #define G27_REV_MIN 0x38
46 #define G27_2_REV_MIN 0x39
47 
48 #define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
49 
50 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
51 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
52 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
53 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
54 
55 static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);
56 
57 struct lg4ff_device_entry {
58 	__u32 product_id;
59 	__u16 range;
60 	__u16 min_range;
61 	__u16 max_range;
62 #ifdef CONFIG_LEDS_CLASS
63 	__u8  led_state;
64 	struct led_classdev *led[5];
65 #endif
66 	struct list_head list;
67 	void (*set_range)(struct hid_device *hid, u16 range);
68 };
69 
70 static const signed short lg4ff_wheel_effects[] = {
71 	FF_CONSTANT,
72 	FF_AUTOCENTER,
73 	-1
74 };
75 
76 struct lg4ff_wheel {
77 	const __u32 product_id;
78 	const signed short *ff_effects;
79 	const __u16 min_range;
80 	const __u16 max_range;
81 	void (*set_range)(struct hid_device *hid, u16 range);
82 };
83 
84 static const struct lg4ff_wheel lg4ff_devices[] = {
85 	{USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
86 	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
87 	{USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
88 	{USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
89 	{USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
90 	{USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
91 	{USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
92 	{USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
93 };
94 
95 struct lg4ff_native_cmd {
96 	const __u8 cmd_num;	/* Number of commands to send */
97 	const __u8 cmd[];
98 };
99 
100 struct lg4ff_usb_revision {
101 	const __u16 rev_maj;
102 	const __u16 rev_min;
103 	const struct lg4ff_native_cmd *command;
104 };
105 
106 static const struct lg4ff_native_cmd native_dfp = {
107 	1,
108 	{0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
109 };
110 
111 static const struct lg4ff_native_cmd native_dfgt = {
112 	2,
113 	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* 1st command */
114 	 0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}	/* 2nd command */
115 };
116 
117 static const struct lg4ff_native_cmd native_g25 = {
118 	1,
119 	{0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
120 };
121 
122 static const struct lg4ff_native_cmd native_g27 = {
123 	2,
124 	{0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,	/* 1st command */
125 	 0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}	/* 2nd command */
126 };
127 
128 static const struct lg4ff_usb_revision lg4ff_revs[] = {
129 	{DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt},	/* Driving Force GT */
130 	{DFGT_REV_MAJ, DFGT2_REV_MIN, &native_dfgt},	/* Driving Force GT v2 */
131 	{DFP_REV_MAJ,  DFP_REV_MIN,  &native_dfp},	/* Driving Force Pro */
132 	{G25_REV_MAJ,  G25_REV_MIN,  &native_g25},	/* G25 */
133 	{G27_REV_MAJ,  G27_REV_MIN,  &native_g27},	/* G27 */
134 	{G27_REV_MAJ,  G27_2_REV_MIN,  &native_g27},	/* G27 v2 */
135 };
136 
137 /* Recalculates X axis value accordingly to currently selected range */
138 static __s32 lg4ff_adjust_dfp_x_axis(__s32 value, __u16 range)
139 {
140 	__u16 max_range;
141 	__s32 new_value;
142 
143 	if (range == 900)
144 		return value;
145 	else if (range == 200)
146 		return value;
147 	else if (range < 200)
148 		max_range = 200;
149 	else
150 		max_range = 900;
151 
152 	new_value = 8192 + mult_frac(value - 8192, max_range, range);
153 	if (new_value < 0)
154 		return 0;
155 	else if (new_value > 16383)
156 		return 16383;
157 	else
158 		return new_value;
159 }
160 
161 int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
162 			     struct hid_usage *usage, __s32 value, struct lg_drv_data *drv_data)
163 {
164 	struct lg4ff_device_entry *entry = drv_data->device_props;
165 	__s32 new_value = 0;
166 
167 	if (!entry) {
168 		hid_err(hid, "Device properties not found");
169 		return 0;
170 	}
171 
172 	switch (entry->product_id) {
173 	case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
174 		switch (usage->code) {
175 		case ABS_X:
176 			new_value = lg4ff_adjust_dfp_x_axis(value, entry->range);
177 			input_event(field->hidinput->input, usage->type, usage->code, new_value);
178 			return 1;
179 		default:
180 			return 0;
181 		}
182 	default:
183 		return 0;
184 	}
185 }
186 
187 static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
188 {
189 	struct hid_device *hid = input_get_drvdata(dev);
190 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
191 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
192 	__s32 *value = report->field[0]->value;
193 	int x;
194 
195 #define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)
196 
197 	switch (effect->type) {
198 	case FF_CONSTANT:
199 		x = effect->u.ramp.start_level + 0x80;	/* 0x80 is no force */
200 		CLAMP(x);
201 
202 		if (x == 0x80) {
203 			/* De-activate force in slot-1*/
204 			value[0] = 0x13;
205 			value[1] = 0x00;
206 			value[2] = 0x00;
207 			value[3] = 0x00;
208 			value[4] = 0x00;
209 			value[5] = 0x00;
210 			value[6] = 0x00;
211 
212 			hid_hw_request(hid, report, HID_REQ_SET_REPORT);
213 			return 0;
214 		}
215 
216 		value[0] = 0x11;	/* Slot 1 */
217 		value[1] = 0x08;
218 		value[2] = x;
219 		value[3] = 0x80;
220 		value[4] = 0x00;
221 		value[5] = 0x00;
222 		value[6] = 0x00;
223 
224 		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
225 		break;
226 	}
227 	return 0;
228 }
229 
230 /* Sends default autocentering command compatible with
231  * all wheels except Formula Force EX */
232 static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
233 {
234 	struct hid_device *hid = input_get_drvdata(dev);
235 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
236 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
237 	__s32 *value = report->field[0]->value;
238 	__u32 expand_a, expand_b;
239 	struct lg4ff_device_entry *entry;
240 	struct lg_drv_data *drv_data;
241 
242 	drv_data = hid_get_drvdata(hid);
243 	if (!drv_data) {
244 		hid_err(hid, "Private driver data not found!\n");
245 		return;
246 	}
247 
248 	entry = drv_data->device_props;
249 	if (!entry) {
250 		hid_err(hid, "Device properties not found!\n");
251 		return;
252 	}
253 
254 	/* De-activate Auto-Center */
255 	if (magnitude == 0) {
256 		value[0] = 0xf5;
257 		value[1] = 0x00;
258 		value[2] = 0x00;
259 		value[3] = 0x00;
260 		value[4] = 0x00;
261 		value[5] = 0x00;
262 		value[6] = 0x00;
263 
264 		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
265 		return;
266 	}
267 
268 	if (magnitude <= 0xaaaa) {
269 		expand_a = 0x0c * magnitude;
270 		expand_b = 0x80 * magnitude;
271 	} else {
272 		expand_a = (0x0c * 0xaaaa) + 0x06 * (magnitude - 0xaaaa);
273 		expand_b = (0x80 * 0xaaaa) + 0xff * (magnitude - 0xaaaa);
274 	}
275 
276 	/* Adjust for non-MOMO wheels */
277 	switch (entry->product_id) {
278 	case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
279 	case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
280 		break;
281 	default:
282 		expand_a = expand_a >> 1;
283 		break;
284 	}
285 
286 	value[0] = 0xfe;
287 	value[1] = 0x0d;
288 	value[2] = expand_a / 0xaaaa;
289 	value[3] = expand_a / 0xaaaa;
290 	value[4] = expand_b / 0xaaaa;
291 	value[5] = 0x00;
292 	value[6] = 0x00;
293 
294 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
295 
296 	/* Activate Auto-Center */
297 	value[0] = 0x14;
298 	value[1] = 0x00;
299 	value[2] = 0x00;
300 	value[3] = 0x00;
301 	value[4] = 0x00;
302 	value[5] = 0x00;
303 	value[6] = 0x00;
304 
305 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
306 }
307 
308 /* Sends autocentering command compatible with Formula Force EX */
309 static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
310 {
311 	struct hid_device *hid = input_get_drvdata(dev);
312 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
313 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
314 	__s32 *value = report->field[0]->value;
315 	magnitude = magnitude * 90 / 65535;
316 
317 	value[0] = 0xfe;
318 	value[1] = 0x03;
319 	value[2] = magnitude >> 14;
320 	value[3] = magnitude >> 14;
321 	value[4] = magnitude;
322 	value[5] = 0x00;
323 	value[6] = 0x00;
324 
325 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
326 }
327 
328 /* Sends command to set range compatible with G25/G27/Driving Force GT */
329 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
330 {
331 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
332 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
333 	__s32 *value = report->field[0]->value;
334 
335 	dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
336 
337 	value[0] = 0xf8;
338 	value[1] = 0x81;
339 	value[2] = range & 0x00ff;
340 	value[3] = (range & 0xff00) >> 8;
341 	value[4] = 0x00;
342 	value[5] = 0x00;
343 	value[6] = 0x00;
344 
345 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
346 }
347 
348 /* Sends commands to set range compatible with Driving Force Pro wheel */
349 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
350 {
351 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
352 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
353 	int start_left, start_right, full_range;
354 	__s32 *value = report->field[0]->value;
355 
356 	dbg_hid("Driving Force Pro: setting range to %u\n", range);
357 
358 	/* Prepare "coarse" limit command */
359 	value[0] = 0xf8;
360 	value[1] = 0x00;	/* Set later */
361 	value[2] = 0x00;
362 	value[3] = 0x00;
363 	value[4] = 0x00;
364 	value[5] = 0x00;
365 	value[6] = 0x00;
366 
367 	if (range > 200) {
368 		report->field[0]->value[1] = 0x03;
369 		full_range = 900;
370 	} else {
371 		report->field[0]->value[1] = 0x02;
372 		full_range = 200;
373 	}
374 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
375 
376 	/* Prepare "fine" limit command */
377 	value[0] = 0x81;
378 	value[1] = 0x0b;
379 	value[2] = 0x00;
380 	value[3] = 0x00;
381 	value[4] = 0x00;
382 	value[5] = 0x00;
383 	value[6] = 0x00;
384 
385 	if (range == 200 || range == 900) {	/* Do not apply any fine limit */
386 		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
387 		return;
388 	}
389 
390 	/* Construct fine limit command */
391 	start_left = (((full_range - range + 1) * 2047) / full_range);
392 	start_right = 0xfff - start_left;
393 
394 	value[2] = start_left >> 4;
395 	value[3] = start_right >> 4;
396 	value[4] = 0xff;
397 	value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
398 	value[6] = 0xff;
399 
400 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
401 }
402 
403 static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
404 {
405 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
406 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
407 	__u8 i, j;
408 
409 	j = 0;
410 	while (j < 7*cmd->cmd_num) {
411 		for (i = 0; i < 7; i++)
412 			report->field[0]->value[i] = cmd->cmd[j++];
413 
414 		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
415 	}
416 }
417 
418 /* Read current range and display it in terminal */
419 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
420 {
421 	struct hid_device *hid = to_hid_device(dev);
422 	struct lg4ff_device_entry *entry;
423 	struct lg_drv_data *drv_data;
424 	size_t count;
425 
426 	drv_data = hid_get_drvdata(hid);
427 	if (!drv_data) {
428 		hid_err(hid, "Private driver data not found!\n");
429 		return 0;
430 	}
431 
432 	entry = drv_data->device_props;
433 	if (!entry) {
434 		hid_err(hid, "Device properties not found!\n");
435 		return 0;
436 	}
437 
438 	count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
439 	return count;
440 }
441 
442 /* Set range to user specified value, call appropriate function
443  * according to the type of the wheel */
444 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
445 {
446 	struct hid_device *hid = to_hid_device(dev);
447 	struct lg4ff_device_entry *entry;
448 	struct lg_drv_data *drv_data;
449 	__u16 range = simple_strtoul(buf, NULL, 10);
450 
451 	drv_data = hid_get_drvdata(hid);
452 	if (!drv_data) {
453 		hid_err(hid, "Private driver data not found!\n");
454 		return 0;
455 	}
456 
457 	entry = drv_data->device_props;
458 	if (!entry) {
459 		hid_err(hid, "Device properties not found!\n");
460 		return 0;
461 	}
462 
463 	if (range == 0)
464 		range = entry->max_range;
465 
466 	/* Check if the wheel supports range setting
467 	 * and that the range is within limits for the wheel */
468 	if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
469 		entry->set_range(hid, range);
470 		entry->range = range;
471 	}
472 
473 	return count;
474 }
475 
476 #ifdef CONFIG_LEDS_CLASS
477 static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
478 {
479 	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
480 	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
481 	__s32 *value = report->field[0]->value;
482 
483 	value[0] = 0xf8;
484 	value[1] = 0x12;
485 	value[2] = leds;
486 	value[3] = 0x00;
487 	value[4] = 0x00;
488 	value[5] = 0x00;
489 	value[6] = 0x00;
490 	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
491 }
492 
493 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
494 			enum led_brightness value)
495 {
496 	struct device *dev = led_cdev->dev->parent;
497 	struct hid_device *hid = container_of(dev, struct hid_device, dev);
498 	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
499 	struct lg4ff_device_entry *entry;
500 	int i, state = 0;
501 
502 	if (!drv_data) {
503 		hid_err(hid, "Device data not found.");
504 		return;
505 	}
506 
507 	entry = (struct lg4ff_device_entry *)drv_data->device_props;
508 
509 	if (!entry) {
510 		hid_err(hid, "Device properties not found.");
511 		return;
512 	}
513 
514 	for (i = 0; i < 5; i++) {
515 		if (led_cdev != entry->led[i])
516 			continue;
517 		state = (entry->led_state >> i) & 1;
518 		if (value == LED_OFF && state) {
519 			entry->led_state &= ~(1 << i);
520 			lg4ff_set_leds(hid, entry->led_state);
521 		} else if (value != LED_OFF && !state) {
522 			entry->led_state |= 1 << i;
523 			lg4ff_set_leds(hid, entry->led_state);
524 		}
525 		break;
526 	}
527 }
528 
529 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
530 {
531 	struct device *dev = led_cdev->dev->parent;
532 	struct hid_device *hid = container_of(dev, struct hid_device, dev);
533 	struct lg_drv_data *drv_data = hid_get_drvdata(hid);
534 	struct lg4ff_device_entry *entry;
535 	int i, value = 0;
536 
537 	if (!drv_data) {
538 		hid_err(hid, "Device data not found.");
539 		return LED_OFF;
540 	}
541 
542 	entry = (struct lg4ff_device_entry *)drv_data->device_props;
543 
544 	if (!entry) {
545 		hid_err(hid, "Device properties not found.");
546 		return LED_OFF;
547 	}
548 
549 	for (i = 0; i < 5; i++)
550 		if (led_cdev == entry->led[i]) {
551 			value = (entry->led_state >> i) & 1;
552 			break;
553 		}
554 
555 	return value ? LED_FULL : LED_OFF;
556 }
557 #endif
558 
559 int lg4ff_init(struct hid_device *hid)
560 {
561 	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
562 	struct input_dev *dev = hidinput->input;
563 	struct lg4ff_device_entry *entry;
564 	struct lg_drv_data *drv_data;
565 	struct usb_device_descriptor *udesc;
566 	int error, i, j;
567 	__u16 bcdDevice, rev_maj, rev_min;
568 
569 	/* Check that the report looks ok */
570 	if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
571 		return -1;
572 
573 	/* Check what wheel has been connected */
574 	for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
575 		if (hid->product == lg4ff_devices[i].product_id) {
576 			dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
577 			break;
578 		}
579 	}
580 
581 	if (i == ARRAY_SIZE(lg4ff_devices)) {
582 		hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
583 			     "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
584 		return -1;
585 	}
586 
587 	/* Attempt to switch wheel to native mode when applicable */
588 	udesc = &(hid_to_usb_dev(hid)->descriptor);
589 	if (!udesc) {
590 		hid_err(hid, "NULL USB device descriptor\n");
591 		return -1;
592 	}
593 	bcdDevice = le16_to_cpu(udesc->bcdDevice);
594 	rev_maj = bcdDevice >> 8;
595 	rev_min = bcdDevice & 0xff;
596 
597 	if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
598 		dbg_hid("Generic wheel detected, can it do native?\n");
599 		dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);
600 
601 		for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
602 			if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
603 				hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
604 				hid_info(hid, "Switched to native mode\n");
605 			}
606 		}
607 	}
608 
609 	/* Set supported force feedback capabilities */
610 	for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
611 		set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
612 
613 	error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
614 
615 	if (error)
616 		return error;
617 
618 	/* Get private driver data */
619 	drv_data = hid_get_drvdata(hid);
620 	if (!drv_data) {
621 		hid_err(hid, "Cannot add device, private driver data not allocated\n");
622 		return -1;
623 	}
624 
625 	/* Initialize device properties */
626 	entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
627 	if (!entry) {
628 		hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
629 		return -ENOMEM;
630 	}
631 	drv_data->device_props = entry;
632 
633 	entry->product_id = lg4ff_devices[i].product_id;
634 	entry->min_range = lg4ff_devices[i].min_range;
635 	entry->max_range = lg4ff_devices[i].max_range;
636 	entry->set_range = lg4ff_devices[i].set_range;
637 
638 	/* Check if autocentering is available and
639 	 * set the centering force to zero by default */
640 	if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
641 		if (rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN)	/* Formula Force EX expects different autocentering command */
642 			dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
643 		else
644 			dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;
645 
646 		dev->ff->set_autocenter(dev, 0);
647 	}
648 
649 	/* Create sysfs interface */
650 	error = device_create_file(&hid->dev, &dev_attr_range);
651 	if (error)
652 		return error;
653 	dbg_hid("sysfs interface created\n");
654 
655 	/* Set the maximum range to start with */
656 	entry->range = entry->max_range;
657 	if (entry->set_range != NULL)
658 		entry->set_range(hid, entry->range);
659 
660 #ifdef CONFIG_LEDS_CLASS
661 	/* register led subsystem - G27 only */
662 	entry->led_state = 0;
663 	for (j = 0; j < 5; j++)
664 		entry->led[j] = NULL;
665 
666 	if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
667 		struct led_classdev *led;
668 		size_t name_sz;
669 		char *name;
670 
671 		lg4ff_set_leds(hid, 0);
672 
673 		name_sz = strlen(dev_name(&hid->dev)) + 8;
674 
675 		for (j = 0; j < 5; j++) {
676 			led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
677 			if (!led) {
678 				hid_err(hid, "can't allocate memory for LED %d\n", j);
679 				goto err;
680 			}
681 
682 			name = (void *)(&led[1]);
683 			snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
684 			led->name = name;
685 			led->brightness = 0;
686 			led->max_brightness = 1;
687 			led->brightness_get = lg4ff_led_get_brightness;
688 			led->brightness_set = lg4ff_led_set_brightness;
689 
690 			entry->led[j] = led;
691 			error = led_classdev_register(&hid->dev, led);
692 
693 			if (error) {
694 				hid_err(hid, "failed to register LED %d. Aborting.\n", j);
695 err:
696 				/* Deregister LEDs (if any) */
697 				for (j = 0; j < 5; j++) {
698 					led = entry->led[j];
699 					entry->led[j] = NULL;
700 					if (!led)
701 						continue;
702 					led_classdev_unregister(led);
703 					kfree(led);
704 				}
705 				goto out;	/* Let the driver continue without LEDs */
706 			}
707 		}
708 	}
709 out:
710 #endif
711 	hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
712 	return 0;
713 }
714 
715 
716 
717 int lg4ff_deinit(struct hid_device *hid)
718 {
719 	struct lg4ff_device_entry *entry;
720 	struct lg_drv_data *drv_data;
721 
722 	device_remove_file(&hid->dev, &dev_attr_range);
723 
724 	drv_data = hid_get_drvdata(hid);
725 	if (!drv_data) {
726 		hid_err(hid, "Error while deinitializing device, no private driver data.\n");
727 		return -1;
728 	}
729 	entry = drv_data->device_props;
730 	if (!entry) {
731 		hid_err(hid, "Error while deinitializing device, no device properties data.\n");
732 		return -1;
733 	}
734 
735 #ifdef CONFIG_LEDS_CLASS
736 	{
737 		int j;
738 		struct led_classdev *led;
739 
740 		/* Deregister LEDs (if any) */
741 		for (j = 0; j < 5; j++) {
742 
743 			led = entry->led[j];
744 			entry->led[j] = NULL;
745 			if (!led)
746 				continue;
747 			led_classdev_unregister(led);
748 			kfree(led);
749 		}
750 	}
751 #endif
752 
753 	/* Deallocate memory */
754 	kfree(entry);
755 
756 	dbg_hid("Device successfully unregistered\n");
757 	return 0;
758 }
759