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