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