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