drivers/hid/hid-lg4ff.c

   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
 200                 if (x == 0x80) {
 201                         /* De-activate force in slot-1*/
 202                         value[0] = 0x13;
 203                         value[1] = 0x00;
 204                         value[2] = 0x00;
 205                         value[3] = 0x00;
 206                         value[4] = 0x00;
 207                         value[5] = 0x00;
 208                         value[6] = 0x00;
 209
 210                         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 211                         return 0;
 212                 }
 213
 214                 value[0] = 0x11;        /* Slot 1 */
 215                 value[1] = 0x08;
 216                 value[2] = x;
 217                 value[3] = 0x80;
 218                 value[4] = 0x00;
 219                 value[5] = 0x00;
 220                 value[6] = 0x00;
 221
 222                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 223                 break;
 224         }
 225         return 0;
 226 }
 227
 228 /* Sends default autocentering command compatible with
 229  * all wheels except Formula Force EX */
 230 static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 231 {
 232         struct hid_device *hid = input_get_drvdata(dev);
 233         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 234         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 235         __s32 *value = report->field[0]->value;
 236         __u32 expand_a, expand_b;
 237         struct lg4ff_device_entry *entry;
 238         struct lg_drv_data *drv_data;
 239
 240         drv_data = hid_get_drvdata(hid);
 241         if (!drv_data) {
 242                 hid_err(hid, "Private driver data not found!\n");
 243                 return;
 244         }
 245
 246         entry = drv_data->device_props;
 247         if (!entry) {
 248                 hid_err(hid, "Device properties not found!\n");
 249                 return;
 250         }
 251
 252         /* De-activate Auto-Center */
 253         if (magnitude == 0) {
 254                 value[0] = 0xf5;
 255                 value[1] = 0x00;
 256                 value[2] = 0x00;
 257                 value[3] = 0x00;
 258                 value[4] = 0x00;
 259                 value[5] = 0x00;
 260                 value[6] = 0x00;
 261
 262                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 263                 return;
 264         }
 265
 266         if (magnitude <= 0xaaaa) {
 267                 expand_a = 0x0c * magnitude;
 268                 expand_b = 0x80 * magnitude;
 269         } else {
 270                 expand_a = (0x0c * 0xaaaa) + 0x06 * (magnitude - 0xaaaa);
 271                 expand_b = (0x80 * 0xaaaa) + 0xff * (magnitude - 0xaaaa);
 272         }
 273
 274         /* Adjust for non-MOMO wheels */
 275         switch (entry->product_id) {
 276         case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
 277         case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
 278                 break;
 279         default:
 280                 expand_a = expand_a >> 1;
 281                 break;
 282         }
 283
 284         value[0] = 0xfe;
 285         value[1] = 0x0d;
 286         value[2] = expand_a / 0xaaaa;
 287         value[3] = expand_a / 0xaaaa;
 288         value[4] = expand_b / 0xaaaa;
 289         value[5] = 0x00;
 290         value[6] = 0x00;
 291
 292         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 293
 294         /* Activate Auto-Center */
 295         value[0] = 0x14;
 296         value[1] = 0x00;
 297         value[2] = 0x00;
 298         value[3] = 0x00;
 299         value[4] = 0x00;
 300         value[5] = 0x00;
 301         value[6] = 0x00;
 302
 303         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 304 }
 305
 306 /* Sends autocentering command compatible with Formula Force EX */
 307 static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 308 {
 309         struct hid_device *hid = input_get_drvdata(dev);
 310         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 311         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 312         __s32 *value = report->field[0]->value;
 313         magnitude = magnitude * 90 / 65535;
 314
 315         value[0] = 0xfe;
 316         value[1] = 0x03;
 317         value[2] = magnitude >> 14;
 318         value[3] = magnitude >> 14;
 319         value[4] = magnitude;
 320         value[5] = 0x00;
 321         value[6] = 0x00;
 322
 323         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 324 }
 325
 326 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 327 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 328 {
 329         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 330         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 331         __s32 *value = report->field[0]->value;
 332
 333         dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 334
 335         value[0] = 0xf8;
 336         value[1] = 0x81;
 337         value[2] = range & 0x00ff;
 338         value[3] = (range & 0xff00) >> 8;
 339         value[4] = 0x00;
 340         value[5] = 0x00;
 341         value[6] = 0x00;
 342
 343         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 344 }
 345
 346 /* Sends commands to set range compatible with Driving Force Pro wheel */
 347 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
 348 {
 349         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 350         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 351         int start_left, start_right, full_range;
 352         __s32 *value = report->field[0]->value;
 353
 354         dbg_hid("Driving Force Pro: setting range to %u\n", range);
 355
 356         /* Prepare "coarse" limit command */
 357         value[0] = 0xf8;
 358         value[1] = 0x00;        /* Set later */
 359         value[2] = 0x00;
 360         value[3] = 0x00;
 361         value[4] = 0x00;
 362         value[5] = 0x00;
 363         value[6] = 0x00;
 364
 365         if (range > 200) {
 366                 report->field[0]->value[1] = 0x03;
 367                 full_range = 900;
 368         } else {
 369                 report->field[0]->value[1] = 0x02;
 370                 full_range = 200;
 371         }
 372         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 373
 374         /* Prepare "fine" limit command */
 375         value[0] = 0x81;
 376         value[1] = 0x0b;
 377         value[2] = 0x00;
 378         value[3] = 0x00;
 379         value[4] = 0x00;
 380         value[5] = 0x00;
 381         value[6] = 0x00;
 382
 383         if (range == 200 || range == 900) {     /* Do not apply any fine limit */
 384                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 385                 return;
 386         }
 387
 388         /* Construct fine limit command */
 389         start_left = (((full_range - range + 1) * 2047) / full_range);
 390         start_right = 0xfff - start_left;
 391
 392         value[2] = start_left >> 4;
 393         value[3] = start_right >> 4;
 394         value[4] = 0xff;
 395         value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 396         value[6] = 0xff;
 397
 398         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 399 }
 400
 401 static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
 402 {
 403         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 404         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 405         __u8 i, j;
 406
 407         j = 0;
 408         while (j < 7*cmd->cmd_num) {
 409                 for (i = 0; i < 7; i++)
 410                         report->field[0]->value[i] = cmd->cmd[j++];
 411
 412                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 413         }
 414 }
 415
 416 /* Read current range and display it in terminal */
 417 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
 418 {
 419         struct hid_device *hid = to_hid_device(dev);
 420         struct lg4ff_device_entry *entry;
 421         struct lg_drv_data *drv_data;
 422         size_t count;
 423
 424         drv_data = hid_get_drvdata(hid);
 425         if (!drv_data) {
 426                 hid_err(hid, "Private driver data not found!\n");
 427                 return 0;
 428         }
 429
 430         entry = drv_data->device_props;
 431         if (!entry) {
 432                 hid_err(hid, "Device properties not found!\n");
 433                 return 0;
 434         }
 435
 436         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
 437         return count;
 438 }
 439
 440 /* Set range to user specified value, call appropriate function
 441  * according to the type of the wheel */
 442 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 443 {
 444         struct hid_device *hid = to_hid_device(dev);
 445         struct lg4ff_device_entry *entry;
 446         struct lg_drv_data *drv_data;
 447         __u16 range = simple_strtoul(buf, NULL, 10);
 448
 449         drv_data = hid_get_drvdata(hid);
 450         if (!drv_data) {
 451                 hid_err(hid, "Private driver data not found!\n");
 452                 return 0;
 453         }
 454
 455         entry = drv_data->device_props;
 456         if (!entry) {
 457                 hid_err(hid, "Device properties not found!\n");
 458                 return 0;
 459         }
 460
 461         if (range == 0)
 462                 range = entry->max_range;
 463
 464         /* Check if the wheel supports range setting
 465          * and that the range is within limits for the wheel */
 466         if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
 467                 entry->set_range(hid, range);
 468                 entry->range = range;
 469         }
 470
 471         return count;
 472 }
 473
 474 #ifdef CONFIG_LEDS_CLASS
 475 static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
 476 {
 477         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 478         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 479         __s32 *value = report->field[0]->value;
 480
 481         value[0] = 0xf8;
 482         value[1] = 0x12;
 483         value[2] = leds;
 484         value[3] = 0x00;
 485         value[4] = 0x00;
 486         value[5] = 0x00;
 487         value[6] = 0x00;
 488         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 489 }
 490
 491 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
 492                         enum led_brightness value)
 493 {
 494         struct device *dev = led_cdev->dev->parent;
 495         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 496         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 497         struct lg4ff_device_entry *entry;
 498         int i, state = 0;
 499
 500         if (!drv_data) {
 501                 hid_err(hid, "Device data not found.");
 502                 return;
 503         }
 504
 505         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 506
 507         if (!entry) {
 508                 hid_err(hid, "Device properties not found.");
 509                 return;
 510         }
 511
 512         for (i = 0; i < 5; i++) {
 513                 if (led_cdev != entry->led[i])
 514                         continue;
 515                 state = (entry->led_state >> i) & 1;
 516                 if (value == LED_OFF && state) {
 517                         entry->led_state &= ~(1 << i);
 518                         lg4ff_set_leds(hid, entry->led_state);
 519                 } else if (value != LED_OFF && !state) {
 520                         entry->led_state |= 1 << i;
 521                         lg4ff_set_leds(hid, entry->led_state);
 522                 }
 523                 break;
 524         }
 525 }
 526
 527 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
 528 {
 529         struct device *dev = led_cdev->dev->parent;
 530         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 531         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 532         struct lg4ff_device_entry *entry;
 533         int i, value = 0;
 534
 535         if (!drv_data) {
 536                 hid_err(hid, "Device data not found.");
 537                 return LED_OFF;
 538         }
 539
 540         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 541
 542         if (!entry) {
 543                 hid_err(hid, "Device properties not found.");
 544                 return LED_OFF;
 545         }
 546
 547         for (i = 0; i < 5; i++)
 548                 if (led_cdev == entry->led[i]) {
 549                         value = (entry->led_state >> i) & 1;
 550                         break;
 551                 }
 552
 553         return value ? LED_FULL : LED_OFF;
 554 }
 555 #endif
 556
 557 int lg4ff_init(struct hid_device *hid)
 558 {
 559         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 560         struct input_dev *dev = hidinput->input;
 561         struct lg4ff_device_entry *entry;
 562         struct lg_drv_data *drv_data;
 563         struct usb_device_descriptor *udesc;
 564         int error, i, j;
 565         __u16 bcdDevice, rev_maj, rev_min;
 566
 567         /* Check that the report looks ok */
 568         if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
 569                 return -1;
 570
 571         /* Check what wheel has been connected */
 572         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
 573                 if (hid->product == lg4ff_devices[i].product_id) {
 574                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
 575                         break;
 576                 }
 577         }
 578
 579         if (i == ARRAY_SIZE(lg4ff_devices)) {
 580                 hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
 581                              "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
 582                 return -1;
 583         }
 584
 585         /* Attempt to switch wheel to native mode when applicable */
 586         udesc = &(hid_to_usb_dev(hid)->descriptor);
 587         if (!udesc) {
 588                 hid_err(hid, "NULL USB device descriptor\n");
 589                 return -1;
 590         }
 591         bcdDevice = le16_to_cpu(udesc->bcdDevice);
 592         rev_maj = bcdDevice >> 8;
 593         rev_min = bcdDevice & 0xff;
 594
 595         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
 596                 dbg_hid("Generic wheel detected, can it do native?\n");
 597                 dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);
 598
 599                 for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
 600                         if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
 601                                 hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
 602                                 hid_info(hid, "Switched to native mode\n");
 603                         }
 604                 }
 605         }
 606
 607         /* Set supported force feedback capabilities */
 608         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
 609                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
 610
 611         error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
 612
 613         if (error)
 614                 return error;
 615
 616         /* Get private driver data */
 617         drv_data = hid_get_drvdata(hid);
 618         if (!drv_data) {
 619                 hid_err(hid, "Cannot add device, private driver data not allocated\n");
 620                 return -1;
 621         }
 622
 623         /* Initialize device properties */
 624         entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
 625         if (!entry) {
 626                 hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
 627                 return -ENOMEM;
 628         }
 629         drv_data->device_props = entry;
 630
 631         entry->product_id = lg4ff_devices[i].product_id;
 632         entry->min_range = lg4ff_devices[i].min_range;
 633         entry->max_range = lg4ff_devices[i].max_range;
 634         entry->set_range = lg4ff_devices[i].set_range;
 635
 636         /* Check if autocentering is available and
 637          * set the centering force to zero by default */
 638         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
 639                 if (rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN) /* Formula Force EX expects different autocentering command */
 640                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
 641                 else
 642                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;
 643
 644                 dev->ff->set_autocenter(dev, 0);
 645         }
 646
 647         /* Create sysfs interface */
 648         error = device_create_file(&hid->dev, &dev_attr_range);
 649         if (error)
 650                 return error;
 651         dbg_hid("sysfs interface created\n");
 652
 653         /* Set the maximum range to start with */
 654         entry->range = entry->max_range;
 655         if (entry->set_range != NULL)
 656                 entry->set_range(hid, entry->range);
 657
 658 #ifdef CONFIG_LEDS_CLASS
 659         /* register led subsystem - G27 only */
 660         entry->led_state = 0;
 661         for (j = 0; j < 5; j++)
 662                 entry->led[j] = NULL;
 663
 664         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
 665                 struct led_classdev *led;
 666                 size_t name_sz;
 667                 char *name;
 668
 669                 lg4ff_set_leds(hid, 0);
 670
 671                 name_sz = strlen(dev_name(&hid->dev)) + 8;
 672
 673                 for (j = 0; j < 5; j++) {
 674                         led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
 675                         if (!led) {
 676                                 hid_err(hid, "can't allocate memory for LED %d\n", j);
 677                                 goto err;
 678                         }
 679
 680                         name = (void *)(&led[1]);
 681                         snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
 682                         led->name = name;
 683                         led->brightness = 0;
 684                         led->max_brightness = 1;
 685                         led->brightness_get = lg4ff_led_get_brightness;
 686                         led->brightness_set = lg4ff_led_set_brightness;
 687
 688                         entry->led[j] = led;
 689                         error = led_classdev_register(&hid->dev, led);
 690
 691                         if (error) {
 692                                 hid_err(hid, "failed to register LED %d. Aborting.\n", j);
 693 err:
 694                                 /* Deregister LEDs (if any) */
 695                                 for (j = 0; j < 5; j++) {
 696                                         led = entry->led[j];
 697                                         entry->led[j] = NULL;
 698                                         if (!led)
 699                                                 continue;
 700                                         led_classdev_unregister(led);
 701                                         kfree(led);
 702                                 }
 703                                 goto out;       /* Let the driver continue without LEDs */
 704                         }
 705                 }
 706         }
 707 out:
 708 #endif
 709         hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
 710         return 0;
 711 }
 712
 713
 714
 715 int lg4ff_deinit(struct hid_device *hid)
 716 {
 717         struct lg4ff_device_entry *entry;
 718         struct lg_drv_data *drv_data;
 719
 720         device_remove_file(&hid->dev, &dev_attr_range);
 721
 722         drv_data = hid_get_drvdata(hid);
 723         if (!drv_data) {
 724                 hid_err(hid, "Error while deinitializing device, no private driver data.\n");
 725                 return -1;
 726         }
 727         entry = drv_data->device_props;
 728         if (!entry) {
 729                 hid_err(hid, "Error while deinitializing device, no device properties data.\n");
 730                 return -1;
 731         }
 732
 733 #ifdef CONFIG_LEDS_CLASS
 734         {
 735                 int j;
 736                 struct led_classdev *led;
 737
 738                 /* Deregister LEDs (if any) */
 739                 for (j = 0; j < 5; j++) {
 740
 741                         led = entry->led[j];
 742                         entry->led[j] = NULL;
 743                         if (!led)
 744                                 continue;
 745                         led_classdev_unregister(led);
 746                         kfree(led);
 747                 }
 748         }
 749 #endif
 750
 751         /* Deallocate memory */
 752         kfree(entry);
 753
 754         dbg_hid("Device successfully unregistered\n");
 755         return 0;
 756 }