drivers/hid/hid-lg4ff.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Force feedback support for Logitech Gaming Wheels
   4  *
   5  *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
   6  *  Speed Force Wireless (WiiWheel)
   7  *
   8  *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
   9  */
  10
  11 /*
  12  */
  13
  14
  15 #include <linux/input.h>
  16 #include <linux/usb.h>
  17 #include <linux/hid.h>
  18
  19 #include "usbhid/usbhid.h"
  20 #include "hid-lg.h"
  21 #include "hid-lg4ff.h"
  22 #include "hid-ids.h"
  23
  24 #define LG4FF_MMODE_IS_MULTIMODE 0
  25 #define LG4FF_MMODE_SWITCHED 1
  26 #define LG4FF_MMODE_NOT_MULTIMODE 2
  27
  28 #define LG4FF_MODE_NATIVE_IDX 0
  29 #define LG4FF_MODE_DFEX_IDX 1
  30 #define LG4FF_MODE_DFP_IDX 2
  31 #define LG4FF_MODE_G25_IDX 3
  32 #define LG4FF_MODE_DFGT_IDX 4
  33 #define LG4FF_MODE_G27_IDX 5
  34 #define LG4FF_MODE_G29_IDX 6
  35 #define LG4FF_MODE_MAX_IDX 7
  36
  37 #define LG4FF_MODE_NATIVE BIT(LG4FF_MODE_NATIVE_IDX)
  38 #define LG4FF_MODE_DFEX BIT(LG4FF_MODE_DFEX_IDX)
  39 #define LG4FF_MODE_DFP BIT(LG4FF_MODE_DFP_IDX)
  40 #define LG4FF_MODE_G25 BIT(LG4FF_MODE_G25_IDX)
  41 #define LG4FF_MODE_DFGT BIT(LG4FF_MODE_DFGT_IDX)
  42 #define LG4FF_MODE_G27 BIT(LG4FF_MODE_G27_IDX)
  43 #define LG4FF_MODE_G29 BIT(LG4FF_MODE_G29_IDX)
  44
  45 #define LG4FF_DFEX_TAG "DF-EX"
  46 #define LG4FF_DFEX_NAME "Driving Force / Formula EX"
  47 #define LG4FF_DFP_TAG "DFP"
  48 #define LG4FF_DFP_NAME "Driving Force Pro"
  49 #define LG4FF_G25_TAG "G25"
  50 #define LG4FF_G25_NAME "G25 Racing Wheel"
  51 #define LG4FF_G27_TAG "G27"
  52 #define LG4FF_G27_NAME "G27 Racing Wheel"
  53 #define LG4FF_G29_TAG "G29"
  54 #define LG4FF_G29_NAME "G29 Racing Wheel"
  55 #define LG4FF_DFGT_TAG "DFGT"
  56 #define LG4FF_DFGT_NAME "Driving Force GT"
  57
  58 #define LG4FF_FFEX_REV_MAJ 0x21
  59 #define LG4FF_FFEX_REV_MIN 0x00
  60
  61 static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
  62 static void lg4ff_set_range_g25(struct hid_device *hid, u16 range);
  63
  64 struct lg4ff_wheel_data {
  65         const u32 product_id;
  66         u16 combine;
  67         u16 range;
  68         const u16 min_range;
  69         const u16 max_range;
  70 #ifdef CONFIG_LEDS_CLASS
  71         u8  led_state;
  72         struct led_classdev *led[5];
  73 #endif
  74         const u32 alternate_modes;
  75         const char * const real_tag;
  76         const char * const real_name;
  77         const u16 real_product_id;
  78
  79         void (*set_range)(struct hid_device *hid, u16 range);
  80 };
  81
  82 struct lg4ff_device_entry {
  83         spinlock_t report_lock; /* Protect output HID report */
  84         struct hid_report *report;
  85         struct lg4ff_wheel_data wdata;
  86 };
  87
  88 static const signed short lg4ff_wheel_effects[] = {
  89         FF_CONSTANT,
  90         FF_AUTOCENTER,
  91         -1
  92 };
  93
  94 static const signed short no_wheel_effects[] = {
  95         -1
  96 };
  97
  98 struct lg4ff_wheel {
  99         const u32 product_id;
 100         const signed short *ff_effects;
 101         const u16 min_range;
 102         const u16 max_range;
 103         void (*set_range)(struct hid_device *hid, u16 range);
 104 };
 105
 106 struct lg4ff_compat_mode_switch {
 107         const u8 cmd_count;     /* Number of commands to send */
 108         const u8 cmd[];
 109 };
 110
 111 struct lg4ff_wheel_ident_info {
 112         const u32 modes;
 113         const u16 mask;
 114         const u16 result;
 115         const u16 real_product_id;
 116 };
 117
 118 struct lg4ff_multimode_wheel {
 119         const u16 product_id;
 120         const u32 alternate_modes;
 121         const char *real_tag;
 122         const char *real_name;
 123 };
 124
 125 struct lg4ff_alternate_mode {
 126         const u16 product_id;
 127         const char *tag;
 128         const char *name;
 129 };
 130
 131 static const struct lg4ff_wheel lg4ff_devices[] = {
 132         {USB_DEVICE_ID_LOGITECH_WINGMAN_FG,  no_wheel_effects,    40, 180, NULL},
 133         {USB_DEVICE_ID_LOGITECH_WINGMAN_FFG, lg4ff_wheel_effects, 40, 180, NULL},
 134         {USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
 135         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
 136         {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_dfp},
 137         {USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
 138         {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
 139         {USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
 140         {USB_DEVICE_ID_LOGITECH_G29_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
 141         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
 142         {USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
 143 };
 144
 145 static const struct lg4ff_multimode_wheel lg4ff_multimode_wheels[] = {
 146         {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,
 147          LG4FF_MODE_NATIVE | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 148          LG4FF_DFP_TAG, LG4FF_DFP_NAME},
 149         {USB_DEVICE_ID_LOGITECH_G25_WHEEL,
 150          LG4FF_MODE_NATIVE | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 151          LG4FF_G25_TAG, LG4FF_G25_NAME},
 152         {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,
 153          LG4FF_MODE_NATIVE | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 154          LG4FF_DFGT_TAG, LG4FF_DFGT_NAME},
 155         {USB_DEVICE_ID_LOGITECH_G27_WHEEL,
 156          LG4FF_MODE_NATIVE | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 157          LG4FF_G27_TAG, LG4FF_G27_NAME},
 158         {USB_DEVICE_ID_LOGITECH_G29_WHEEL,
 159          LG4FF_MODE_NATIVE | LG4FF_MODE_G29 | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 160          LG4FF_G29_TAG, LG4FF_G29_NAME},
 161 };
 162
 163 static const struct lg4ff_alternate_mode lg4ff_alternate_modes[] = {
 164         [LG4FF_MODE_NATIVE_IDX] = {0, "native", ""},
 165         [LG4FF_MODE_DFEX_IDX] = {USB_DEVICE_ID_LOGITECH_WHEEL, LG4FF_DFEX_TAG, LG4FF_DFEX_NAME},
 166         [LG4FF_MODE_DFP_IDX] = {USB_DEVICE_ID_LOGITECH_DFP_WHEEL, LG4FF_DFP_TAG, LG4FF_DFP_NAME},
 167         [LG4FF_MODE_G25_IDX] = {USB_DEVICE_ID_LOGITECH_G25_WHEEL, LG4FF_G25_TAG, LG4FF_G25_NAME},
 168         [LG4FF_MODE_DFGT_IDX] = {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL, LG4FF_DFGT_TAG, LG4FF_DFGT_NAME},
 169         [LG4FF_MODE_G27_IDX] = {USB_DEVICE_ID_LOGITECH_G27_WHEEL, LG4FF_G27_TAG, LG4FF_G27_NAME},
 170         [LG4FF_MODE_G29_IDX] = {USB_DEVICE_ID_LOGITECH_G29_WHEEL, LG4FF_G29_TAG, LG4FF_G29_NAME},
 171 };
 172
 173 /* Multimode wheel identificators */
 174 static const struct lg4ff_wheel_ident_info lg4ff_dfp_ident_info = {
 175         LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 176         0xf000,
 177         0x1000,
 178         USB_DEVICE_ID_LOGITECH_DFP_WHEEL
 179 };
 180
 181 static const struct lg4ff_wheel_ident_info lg4ff_g25_ident_info = {
 182         LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 183         0xff00,
 184         0x1200,
 185         USB_DEVICE_ID_LOGITECH_G25_WHEEL
 186 };
 187
 188 static const struct lg4ff_wheel_ident_info lg4ff_g27_ident_info = {
 189         LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 190         0xfff0,
 191         0x1230,
 192         USB_DEVICE_ID_LOGITECH_G27_WHEEL
 193 };
 194
 195 static const struct lg4ff_wheel_ident_info lg4ff_dfgt_ident_info = {
 196         LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 197         0xff00,
 198         0x1300,
 199         USB_DEVICE_ID_LOGITECH_DFGT_WHEEL
 200 };
 201
 202 static const struct lg4ff_wheel_ident_info lg4ff_g29_ident_info = {
 203         LG4FF_MODE_G29 | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 204         0xfff8,
 205         0x1350,
 206         USB_DEVICE_ID_LOGITECH_G29_WHEEL
 207 };
 208
 209 static const struct lg4ff_wheel_ident_info lg4ff_g29_ident_info2 = {
 210         LG4FF_MODE_G29 | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 211         0xff00,
 212         0x8900,
 213         USB_DEVICE_ID_LOGITECH_G29_WHEEL
 214 };
 215
 216 /* Multimode wheel identification checklists */
 217 static const struct lg4ff_wheel_ident_info *lg4ff_main_checklist[] = {
 218         &lg4ff_g29_ident_info,
 219         &lg4ff_g29_ident_info2,
 220         &lg4ff_dfgt_ident_info,
 221         &lg4ff_g27_ident_info,
 222         &lg4ff_g25_ident_info,
 223         &lg4ff_dfp_ident_info
 224 };
 225
 226 /* Compatibility mode switching commands */
 227 /* EXT_CMD9 - Understood by G27 and DFGT */
 228 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfex = {
 229         2,
 230         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 231          0xf8, 0x09, 0x00, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to DF-EX with detach */
 232 };
 233
 234 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfp = {
 235         2,
 236         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 237          0xf8, 0x09, 0x01, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to DFP with detach */
 238 };
 239
 240 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g25 = {
 241         2,
 242         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 243          0xf8, 0x09, 0x02, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to G25 with detach */
 244 };
 245
 246 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfgt = {
 247         2,
 248         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 249          0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to DFGT with detach */
 250 };
 251
 252 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g27 = {
 253         2,
 254         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 255          0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to G27 with detach */
 256 };
 257
 258 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g29 = {
 259         2,
 260         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 261          0xf8, 0x09, 0x05, 0x01, 0x01, 0x00, 0x00}      /* Switch mode to G29 with detach */
 262 };
 263
 264 /* EXT_CMD1 - Understood by DFP, G25, G27 and DFGT */
 265 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext01_dfp = {
 266         1,
 267         {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
 268 };
 269
 270 /* EXT_CMD16 - Understood by G25 and G27 */
 271 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext16_g25 = {
 272         1,
 273         {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
 274 };
 275
 276 /* Recalculates X axis value accordingly to currently selected range */
 277 static s32 lg4ff_adjust_dfp_x_axis(s32 value, u16 range)
 278 {
 279         u16 max_range;
 280         s32 new_value;
 281
 282         if (range == 900)
 283                 return value;
 284         else if (range == 200)
 285                 return value;
 286         else if (range < 200)
 287                 max_range = 200;
 288         else
 289                 max_range = 900;
 290
 291         new_value = 8192 + mult_frac(value - 8192, max_range, range);
 292         if (new_value < 0)
 293                 return 0;
 294         else if (new_value > 16383)
 295                 return 16383;
 296         else
 297                 return new_value;
 298 }
 299
 300 int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
 301                              struct hid_usage *usage, s32 value, struct lg_drv_data *drv_data)
 302 {
 303         struct lg4ff_device_entry *entry = drv_data->device_props;
 304         s32 new_value = 0;
 305
 306         if (!entry) {
 307                 hid_err(hid, "Device properties not found");
 308                 return 0;
 309         }
 310
 311         switch (entry->wdata.product_id) {
 312         case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 313                 switch (usage->code) {
 314                 case ABS_X:
 315                         new_value = lg4ff_adjust_dfp_x_axis(value, entry->wdata.range);
 316                         input_event(field->hidinput->input, usage->type, usage->code, new_value);
 317                         return 1;
 318                 default:
 319                         return 0;
 320                 }
 321         default:
 322                 return 0;
 323         }
 324 }
 325
 326 int lg4ff_raw_event(struct hid_device *hdev, struct hid_report *report,
 327                 u8 *rd, int size, struct lg_drv_data *drv_data)
 328 {
 329         int offset;
 330         struct lg4ff_device_entry *entry = drv_data->device_props;
 331
 332         if (!entry)
 333                 return 0;
 334
 335         /* adjust HID report present combined pedals data */
 336         if (entry->wdata.combine) {
 337                 switch (entry->wdata.product_id) {
 338                 case USB_DEVICE_ID_LOGITECH_WHEEL:
 339                         rd[5] = rd[3];
 340                         rd[6] = 0x7F;
 341                         return 1;
 342                 case USB_DEVICE_ID_LOGITECH_WINGMAN_FG:
 343                 case USB_DEVICE_ID_LOGITECH_WINGMAN_FFG:
 344                 case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
 345                 case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
 346                         rd[4] = rd[3];
 347                         rd[5] = 0x7F;
 348                         return 1;
 349                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 350                         rd[5] = rd[4];
 351                         rd[6] = 0x7F;
 352                         return 1;
 353                 case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 354                 case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
 355                         offset = 5;
 356                         break;
 357                 case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
 358                 case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
 359                         offset = 6;
 360                         break;
 361                 case USB_DEVICE_ID_LOGITECH_WII_WHEEL:
 362                         offset = 3;
 363                         break;
 364                 default:
 365                         return 0;
 366                 }
 367
 368                 /* Compute a combined axis when wheel does not supply it */
 369                 rd[offset] = (0xFF + rd[offset] - rd[offset+1]) >> 1;
 370                 rd[offset+1] = 0x7F;
 371                 return 1;
 372         }
 373
 374         return 0;
 375 }
 376
 377 static void lg4ff_init_wheel_data(struct lg4ff_wheel_data * const wdata, const struct lg4ff_wheel *wheel,
 378                                   const struct lg4ff_multimode_wheel *mmode_wheel,
 379                                   const u16 real_product_id)
 380 {
 381         u32 alternate_modes = 0;
 382         const char *real_tag = NULL;
 383         const char *real_name = NULL;
 384
 385         if (mmode_wheel) {
 386                 alternate_modes = mmode_wheel->alternate_modes;
 387                 real_tag = mmode_wheel->real_tag;
 388                 real_name = mmode_wheel->real_name;
 389         }
 390
 391         {
 392                 struct lg4ff_wheel_data t_wdata =  { .product_id = wheel->product_id,
 393                                                      .real_product_id = real_product_id,
 394                                                      .combine = 0,
 395                                                      .min_range = wheel->min_range,
 396                                                      .max_range = wheel->max_range,
 397                                                      .set_range = wheel->set_range,
 398                                                      .alternate_modes = alternate_modes,
 399                                                      .real_tag = real_tag,
 400                                                      .real_name = real_name };
 401
 402                 memcpy(wdata, &t_wdata, sizeof(t_wdata));
 403         }
 404 }
 405
 406 static int lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
 407 {
 408         struct hid_device *hid = input_get_drvdata(dev);
 409         struct lg4ff_device_entry *entry;
 410         struct lg_drv_data *drv_data;
 411         unsigned long flags;
 412         s32 *value;
 413         int x;
 414
 415         drv_data = hid_get_drvdata(hid);
 416         if (!drv_data) {
 417                 hid_err(hid, "Private driver data not found!\n");
 418                 return -EINVAL;
 419         }
 420
 421         entry = drv_data->device_props;
 422         if (!entry) {
 423                 hid_err(hid, "Device properties not found!\n");
 424                 return -EINVAL;
 425         }
 426         value = entry->report->field[0]->value;
 427
 428 #define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)
 429
 430         switch (effect->type) {
 431         case FF_CONSTANT:
 432                 x = effect->u.ramp.start_level + 0x80;  /* 0x80 is no force */
 433                 CLAMP(x);
 434
 435                 spin_lock_irqsave(&entry->report_lock, flags);
 436                 if (x == 0x80) {
 437                         /* De-activate force in slot-1*/
 438                         value[0] = 0x13;
 439                         value[1] = 0x00;
 440                         value[2] = 0x00;
 441                         value[3] = 0x00;
 442                         value[4] = 0x00;
 443                         value[5] = 0x00;
 444                         value[6] = 0x00;
 445
 446                         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 447                         spin_unlock_irqrestore(&entry->report_lock, flags);
 448                         return 0;
 449                 }
 450
 451                 value[0] = 0x11;        /* Slot 1 */
 452                 value[1] = 0x08;
 453                 value[2] = x;
 454                 value[3] = 0x80;
 455                 value[4] = 0x00;
 456                 value[5] = 0x00;
 457                 value[6] = 0x00;
 458
 459                 hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 460                 spin_unlock_irqrestore(&entry->report_lock, flags);
 461                 break;
 462         }
 463         return 0;
 464 }
 465
 466 /* Sends default autocentering command compatible with
 467  * all wheels except Formula Force EX */
 468 static void lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 469 {
 470         struct hid_device *hid = input_get_drvdata(dev);
 471         s32 *value;
 472         u32 expand_a, expand_b;
 473         struct lg4ff_device_entry *entry;
 474         struct lg_drv_data *drv_data;
 475         unsigned long flags;
 476
 477         drv_data = hid_get_drvdata(hid);
 478         if (!drv_data) {
 479                 hid_err(hid, "Private driver data not found!\n");
 480                 return;
 481         }
 482
 483         entry = drv_data->device_props;
 484         if (!entry) {
 485                 hid_err(hid, "Device properties not found!\n");
 486                 return;
 487         }
 488         value = entry->report->field[0]->value;
 489
 490         /* De-activate Auto-Center */
 491         spin_lock_irqsave(&entry->report_lock, flags);
 492         if (magnitude == 0) {
 493                 value[0] = 0xf5;
 494                 value[1] = 0x00;
 495                 value[2] = 0x00;
 496                 value[3] = 0x00;
 497                 value[4] = 0x00;
 498                 value[5] = 0x00;
 499                 value[6] = 0x00;
 500
 501                 hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 502                 spin_unlock_irqrestore(&entry->report_lock, flags);
 503                 return;
 504         }
 505
 506         if (magnitude <= 0xaaaa) {
 507                 expand_a = 0x0c * magnitude;
 508                 expand_b = 0x80 * magnitude;
 509         } else {
 510                 expand_a = (0x0c * 0xaaaa) + 0x06 * (magnitude - 0xaaaa);
 511                 expand_b = (0x80 * 0xaaaa) + 0xff * (magnitude - 0xaaaa);
 512         }
 513
 514         /* Adjust for non-MOMO wheels */
 515         switch (entry->wdata.product_id) {
 516         case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
 517         case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
 518                 break;
 519         default:
 520                 expand_a = expand_a >> 1;
 521                 break;
 522         }
 523
 524         value[0] = 0xfe;
 525         value[1] = 0x0d;
 526         value[2] = expand_a / 0xaaaa;
 527         value[3] = expand_a / 0xaaaa;
 528         value[4] = expand_b / 0xaaaa;
 529         value[5] = 0x00;
 530         value[6] = 0x00;
 531
 532         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 533
 534         /* Activate Auto-Center */
 535         value[0] = 0x14;
 536         value[1] = 0x00;
 537         value[2] = 0x00;
 538         value[3] = 0x00;
 539         value[4] = 0x00;
 540         value[5] = 0x00;
 541         value[6] = 0x00;
 542
 543         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 544         spin_unlock_irqrestore(&entry->report_lock, flags);
 545 }
 546
 547 /* Sends autocentering command compatible with Formula Force EX */
 548 static void lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 549 {
 550         struct hid_device *hid = input_get_drvdata(dev);
 551         struct lg4ff_device_entry *entry;
 552         struct lg_drv_data *drv_data;
 553         unsigned long flags;
 554         s32 *value;
 555         magnitude = magnitude * 90 / 65535;
 556
 557         drv_data = hid_get_drvdata(hid);
 558         if (!drv_data) {
 559                 hid_err(hid, "Private driver data not found!\n");
 560                 return;
 561         }
 562
 563         entry = drv_data->device_props;
 564         if (!entry) {
 565                 hid_err(hid, "Device properties not found!\n");
 566                 return;
 567         }
 568         value = entry->report->field[0]->value;
 569
 570         spin_lock_irqsave(&entry->report_lock, flags);
 571         value[0] = 0xfe;
 572         value[1] = 0x03;
 573         value[2] = magnitude >> 14;
 574         value[3] = magnitude >> 14;
 575         value[4] = magnitude;
 576         value[5] = 0x00;
 577         value[6] = 0x00;
 578
 579         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 580         spin_unlock_irqrestore(&entry->report_lock, flags);
 581 }
 582
 583 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 584 static void lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 585 {
 586         struct lg4ff_device_entry *entry;
 587         struct lg_drv_data *drv_data;
 588         unsigned long flags;
 589         s32 *value;
 590
 591         drv_data = hid_get_drvdata(hid);
 592         if (!drv_data) {
 593                 hid_err(hid, "Private driver data not found!\n");
 594                 return;
 595         }
 596
 597         entry = drv_data->device_props;
 598         if (!entry) {
 599                 hid_err(hid, "Device properties not found!\n");
 600                 return;
 601         }
 602         value = entry->report->field[0]->value;
 603         dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 604
 605         spin_lock_irqsave(&entry->report_lock, flags);
 606         value[0] = 0xf8;
 607         value[1] = 0x81;
 608         value[2] = range & 0x00ff;
 609         value[3] = (range & 0xff00) >> 8;
 610         value[4] = 0x00;
 611         value[5] = 0x00;
 612         value[6] = 0x00;
 613
 614         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 615         spin_unlock_irqrestore(&entry->report_lock, flags);
 616 }
 617
 618 /* Sends commands to set range compatible with Driving Force Pro wheel */
 619 static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range)
 620 {
 621         struct lg4ff_device_entry *entry;
 622         struct lg_drv_data *drv_data;
 623         unsigned long flags;
 624         int start_left, start_right, full_range;
 625         s32 *value;
 626
 627         drv_data = hid_get_drvdata(hid);
 628         if (!drv_data) {
 629                 hid_err(hid, "Private driver data not found!\n");
 630                 return;
 631         }
 632
 633         entry = drv_data->device_props;
 634         if (!entry) {
 635                 hid_err(hid, "Device properties not found!\n");
 636                 return;
 637         }
 638         value = entry->report->field[0]->value;
 639         dbg_hid("Driving Force Pro: setting range to %u\n", range);
 640
 641         /* Prepare "coarse" limit command */
 642         spin_lock_irqsave(&entry->report_lock, flags);
 643         value[0] = 0xf8;
 644         value[1] = 0x00;        /* Set later */
 645         value[2] = 0x00;
 646         value[3] = 0x00;
 647         value[4] = 0x00;
 648         value[5] = 0x00;
 649         value[6] = 0x00;
 650
 651         if (range > 200) {
 652                 value[1] = 0x03;
 653                 full_range = 900;
 654         } else {
 655                 value[1] = 0x02;
 656                 full_range = 200;
 657         }
 658         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 659
 660         /* Prepare "fine" limit command */
 661         value[0] = 0x81;
 662         value[1] = 0x0b;
 663         value[2] = 0x00;
 664         value[3] = 0x00;
 665         value[4] = 0x00;
 666         value[5] = 0x00;
 667         value[6] = 0x00;
 668
 669         if (range == 200 || range == 900) {     /* Do not apply any fine limit */
 670                 hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 671                 spin_unlock_irqrestore(&entry->report_lock, flags);
 672                 return;
 673         }
 674
 675         /* Construct fine limit command */
 676         start_left = (((full_range - range + 1) * 2047) / full_range);
 677         start_right = 0xfff - start_left;
 678
 679         value[2] = start_left >> 4;
 680         value[3] = start_right >> 4;
 681         value[4] = 0xff;
 682         value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 683         value[6] = 0xff;
 684
 685         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 686         spin_unlock_irqrestore(&entry->report_lock, flags);
 687 }
 688
 689 static const struct lg4ff_compat_mode_switch *lg4ff_get_mode_switch_command(const u16 real_product_id, const u16 target_product_id)
 690 {
 691         switch (real_product_id) {
 692         case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 693                 switch (target_product_id) {
 694                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 695                         return &lg4ff_mode_switch_ext01_dfp;
 696                 /* DFP can only be switched to its native mode */
 697                 default:
 698                         return NULL;
 699                 }
 700                 break;
 701         case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 702                 switch (target_product_id) {
 703                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 704                         return &lg4ff_mode_switch_ext01_dfp;
 705                 case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 706                         return &lg4ff_mode_switch_ext16_g25;
 707                 /* G25 can only be switched to DFP mode or its native mode */
 708                 default:
 709                         return NULL;
 710                 }
 711                 break;
 712         case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
 713                 switch (target_product_id) {
 714                 case USB_DEVICE_ID_LOGITECH_WHEEL:
 715                         return &lg4ff_mode_switch_ext09_dfex;
 716                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 717                         return &lg4ff_mode_switch_ext09_dfp;
 718                 case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 719                         return &lg4ff_mode_switch_ext09_g25;
 720                 case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
 721                         return &lg4ff_mode_switch_ext09_g27;
 722                 /* G27 can only be switched to DF-EX, DFP, G25 or its native mode */
 723                 default:
 724                         return NULL;
 725                 }
 726                 break;
 727         case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
 728                 switch (target_product_id) {
 729                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 730                         return &lg4ff_mode_switch_ext09_dfp;
 731                 case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
 732                         return &lg4ff_mode_switch_ext09_dfgt;
 733                 case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 734                         return &lg4ff_mode_switch_ext09_g25;
 735                 case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
 736                         return &lg4ff_mode_switch_ext09_g27;
 737                 case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
 738                         return &lg4ff_mode_switch_ext09_g29;
 739                 /* G29 can only be switched to DF-EX, DFP, DFGT, G25, G27 or its native mode */
 740                 default:
 741                         return NULL;
 742                 }
 743                 break;
 744         case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
 745                 switch (target_product_id) {
 746                 case USB_DEVICE_ID_LOGITECH_WHEEL:
 747                         return &lg4ff_mode_switch_ext09_dfex;
 748                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 749                         return &lg4ff_mode_switch_ext09_dfp;
 750                 case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
 751                         return &lg4ff_mode_switch_ext09_dfgt;
 752                 /* DFGT can only be switched to DF-EX, DFP or its native mode */
 753                 default:
 754                         return NULL;
 755                 }
 756                 break;
 757         /* No other wheels have multiple modes */
 758         default:
 759                 return NULL;
 760         }
 761 }
 762
 763 static int lg4ff_switch_compatibility_mode(struct hid_device *hid, const struct lg4ff_compat_mode_switch *s)
 764 {
 765         struct lg4ff_device_entry *entry;
 766         struct lg_drv_data *drv_data;
 767         unsigned long flags;
 768         s32 *value;
 769         u8 i;
 770
 771         drv_data = hid_get_drvdata(hid);
 772         if (!drv_data) {
 773                 hid_err(hid, "Private driver data not found!\n");
 774                 return -EINVAL;
 775         }
 776
 777         entry = drv_data->device_props;
 778         if (!entry) {
 779                 hid_err(hid, "Device properties not found!\n");
 780                 return -EINVAL;
 781         }
 782         value = entry->report->field[0]->value;
 783
 784         spin_lock_irqsave(&entry->report_lock, flags);
 785         for (i = 0; i < s->cmd_count; i++) {
 786                 u8 j;
 787
 788                 for (j = 0; j < 7; j++)
 789                         value[j] = s->cmd[j + (7*i)];
 790
 791                 hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 792         }
 793         spin_unlock_irqrestore(&entry->report_lock, flags);
 794         hid_hw_wait(hid);
 795         return 0;
 796 }
 797
 798 static ssize_t lg4ff_alternate_modes_show(struct device *dev, struct device_attribute *attr, char *buf)
 799 {
 800         struct hid_device *hid = to_hid_device(dev);
 801         struct lg4ff_device_entry *entry;
 802         struct lg_drv_data *drv_data;
 803         ssize_t count = 0;
 804         int i;
 805
 806         drv_data = hid_get_drvdata(hid);
 807         if (!drv_data) {
 808                 hid_err(hid, "Private driver data not found!\n");
 809                 return 0;
 810         }
 811
 812         entry = drv_data->device_props;
 813         if (!entry) {
 814                 hid_err(hid, "Device properties not found!\n");
 815                 return 0;
 816         }
 817
 818         if (!entry->wdata.real_name) {
 819                 hid_err(hid, "NULL pointer to string\n");
 820                 return 0;
 821         }
 822
 823         for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) {
 824                 if (entry->wdata.alternate_modes & BIT(i)) {
 825                         /* Print tag and full name */
 826                         count += scnprintf(buf + count, PAGE_SIZE - count, "%s: %s",
 827                                            lg4ff_alternate_modes[i].tag,
 828                                            !lg4ff_alternate_modes[i].product_id ? entry->wdata.real_name : lg4ff_alternate_modes[i].name);
 829                         if (count >= PAGE_SIZE - 1)
 830                                 return count;
 831
 832                         /* Mark the currently active mode with an asterisk */
 833                         if (lg4ff_alternate_modes[i].product_id == entry->wdata.product_id ||
 834                             (lg4ff_alternate_modes[i].product_id == 0 && entry->wdata.product_id == entry->wdata.real_product_id))
 835                                 count += scnprintf(buf + count, PAGE_SIZE - count, " *\n");
 836                         else
 837                                 count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
 838
 839                         if (count >= PAGE_SIZE - 1)
 840                                 return count;
 841                 }
 842         }
 843
 844         return count;
 845 }
 846
 847 static ssize_t lg4ff_alternate_modes_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 848 {
 849         struct hid_device *hid = to_hid_device(dev);
 850         struct lg4ff_device_entry *entry;
 851         struct lg_drv_data *drv_data;
 852         const struct lg4ff_compat_mode_switch *s;
 853         u16 target_product_id = 0;
 854         int i, ret;
 855         char *lbuf;
 856
 857         drv_data = hid_get_drvdata(hid);
 858         if (!drv_data) {
 859                 hid_err(hid, "Private driver data not found!\n");
 860                 return -EINVAL;
 861         }
 862
 863         entry = drv_data->device_props;
 864         if (!entry) {
 865                 hid_err(hid, "Device properties not found!\n");
 866                 return -EINVAL;
 867         }
 868
 869         /* Allow \n at the end of the input parameter */
 870         lbuf = kasprintf(GFP_KERNEL, "%s", buf);
 871         if (!lbuf)
 872                 return -ENOMEM;
 873
 874         i = strlen(lbuf);
 875         if (lbuf[i-1] == '\n') {
 876                 if (i == 1) {
 877                         kfree(lbuf);
 878                         return -EINVAL;
 879                 }
 880                 lbuf[i-1] = '\0';
 881         }
 882
 883         for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) {
 884                 const u16 mode_product_id = lg4ff_alternate_modes[i].product_id;
 885                 const char *tag = lg4ff_alternate_modes[i].tag;
 886
 887                 if (entry->wdata.alternate_modes & BIT(i)) {
 888                         if (!strcmp(tag, lbuf)) {
 889                                 if (!mode_product_id)
 890                                         target_product_id = entry->wdata.real_product_id;
 891                                 else
 892                                         target_product_id = mode_product_id;
 893                                 break;
 894                         }
 895                 }
 896         }
 897
 898         if (i == LG4FF_MODE_MAX_IDX) {
 899                 hid_info(hid, "Requested mode \"%s\" is not supported by the device\n", lbuf);
 900                 kfree(lbuf);
 901                 return -EINVAL;
 902         }
 903         kfree(lbuf); /* Not needed anymore */
 904
 905         if (target_product_id == entry->wdata.product_id) /* Nothing to do */
 906                 return count;
 907
 908         /* Automatic switching has to be disabled for the switch to DF-EX mode to work correctly */
 909         if (target_product_id == USB_DEVICE_ID_LOGITECH_WHEEL && !lg4ff_no_autoswitch) {
 910                 hid_info(hid, "\"%s\" cannot be switched to \"DF-EX\" mode. Load the \"hid_logitech\" module with \"lg4ff_no_autoswitch=1\" parameter set and try again\n",
 911                          entry->wdata.real_name);
 912                 return -EINVAL;
 913         }
 914
 915         /* Take care of hardware limitations */
 916         if ((entry->wdata.real_product_id == USB_DEVICE_ID_LOGITECH_DFP_WHEEL || entry->wdata.real_product_id == USB_DEVICE_ID_LOGITECH_G25_WHEEL) &&
 917             entry->wdata.product_id > target_product_id) {
 918                 hid_info(hid, "\"%s\" cannot be switched back into \"%s\" mode\n", entry->wdata.real_name, lg4ff_alternate_modes[i].name);
 919                 return -EINVAL;
 920         }
 921
 922         s = lg4ff_get_mode_switch_command(entry->wdata.real_product_id, target_product_id);
 923         if (!s) {
 924                 hid_err(hid, "Invalid target product ID %X\n", target_product_id);
 925                 return -EINVAL;
 926         }
 927
 928         ret = lg4ff_switch_compatibility_mode(hid, s);
 929         return (ret == 0 ? count : ret);
 930 }
 931 static DEVICE_ATTR(alternate_modes, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_alternate_modes_show, lg4ff_alternate_modes_store);
 932
 933 static ssize_t lg4ff_combine_show(struct device *dev, struct device_attribute *attr,
 934                                 char *buf)
 935 {
 936         struct hid_device *hid = to_hid_device(dev);
 937         struct lg4ff_device_entry *entry;
 938         struct lg_drv_data *drv_data;
 939         size_t count;
 940
 941         drv_data = hid_get_drvdata(hid);
 942         if (!drv_data) {
 943                 hid_err(hid, "Private driver data not found!\n");
 944                 return 0;
 945         }
 946
 947         entry = drv_data->device_props;
 948         if (!entry) {
 949                 hid_err(hid, "Device properties not found!\n");
 950                 return 0;
 951         }
 952
 953         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.combine);
 954         return count;
 955 }
 956
 957 static ssize_t lg4ff_combine_store(struct device *dev, struct device_attribute *attr,
 958                                  const char *buf, size_t count)
 959 {
 960         struct hid_device *hid = to_hid_device(dev);
 961         struct lg4ff_device_entry *entry;
 962         struct lg_drv_data *drv_data;
 963         u16 combine = simple_strtoul(buf, NULL, 10);
 964
 965         drv_data = hid_get_drvdata(hid);
 966         if (!drv_data) {
 967                 hid_err(hid, "Private driver data not found!\n");
 968                 return -EINVAL;
 969         }
 970
 971         entry = drv_data->device_props;
 972         if (!entry) {
 973                 hid_err(hid, "Device properties not found!\n");
 974                 return -EINVAL;
 975         }
 976
 977         if (combine > 1)
 978                 combine = 1;
 979
 980         entry->wdata.combine = combine;
 981         return count;
 982 }
 983 static DEVICE_ATTR(combine_pedals, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_combine_show, lg4ff_combine_store);
 984
 985 /* Export the currently set range of the wheel */
 986 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr,
 987                                 char *buf)
 988 {
 989         struct hid_device *hid = to_hid_device(dev);
 990         struct lg4ff_device_entry *entry;
 991         struct lg_drv_data *drv_data;
 992         size_t count;
 993
 994         drv_data = hid_get_drvdata(hid);
 995         if (!drv_data) {
 996                 hid_err(hid, "Private driver data not found!\n");
 997                 return 0;
 998         }
 999
1000         entry = drv_data->device_props;
1001         if (!entry) {
1002                 hid_err(hid, "Device properties not found!\n");
1003                 return 0;
1004         }
1005
1006         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.range);
1007         return count;
1008 }
1009
1010 /* Set range to user specified value, call appropriate function
1011  * according to the type of the wheel */
1012 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr,
1013                                  const char *buf, size_t count)
1014 {
1015         struct hid_device *hid = to_hid_device(dev);
1016         struct lg4ff_device_entry *entry;
1017         struct lg_drv_data *drv_data;
1018         u16 range = simple_strtoul(buf, NULL, 10);
1019
1020         drv_data = hid_get_drvdata(hid);
1021         if (!drv_data) {
1022                 hid_err(hid, "Private driver data not found!\n");
1023                 return -EINVAL;
1024         }
1025
1026         entry = drv_data->device_props;
1027         if (!entry) {
1028                 hid_err(hid, "Device properties not found!\n");
1029                 return -EINVAL;
1030         }
1031
1032         if (range == 0)
1033                 range = entry->wdata.max_range;
1034
1035         /* Check if the wheel supports range setting
1036          * and that the range is within limits for the wheel */
1037         if (entry->wdata.set_range && range >= entry->wdata.min_range && range <= entry->wdata.max_range) {
1038                 entry->wdata.set_range(hid, range);
1039                 entry->wdata.range = range;
1040         }
1041
1042         return count;
1043 }
1044 static DEVICE_ATTR(range, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_range_show, lg4ff_range_store);
1045
1046 static ssize_t lg4ff_real_id_show(struct device *dev, struct device_attribute *attr, char *buf)
1047 {
1048         struct hid_device *hid = to_hid_device(dev);
1049         struct lg4ff_device_entry *entry;
1050         struct lg_drv_data *drv_data;
1051         size_t count;
1052
1053         drv_data = hid_get_drvdata(hid);
1054         if (!drv_data) {
1055                 hid_err(hid, "Private driver data not found!\n");
1056                 return 0;
1057         }
1058
1059         entry = drv_data->device_props;
1060         if (!entry) {
1061                 hid_err(hid, "Device properties not found!\n");
1062                 return 0;
1063         }
1064
1065         if (!entry->wdata.real_tag || !entry->wdata.real_name) {
1066                 hid_err(hid, "NULL pointer to string\n");
1067                 return 0;
1068         }
1069
1070         count = scnprintf(buf, PAGE_SIZE, "%s: %s\n", entry->wdata.real_tag, entry->wdata.real_name);
1071         return count;
1072 }
1073
1074 static ssize_t lg4ff_real_id_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1075 {
1076         /* Real ID is a read-only value */
1077         return -EPERM;
1078 }
1079 static DEVICE_ATTR(real_id, S_IRUGO, lg4ff_real_id_show, lg4ff_real_id_store);
1080
1081 #ifdef CONFIG_LEDS_CLASS
1082 static void lg4ff_set_leds(struct hid_device *hid, u8 leds)
1083 {
1084         struct lg_drv_data *drv_data;
1085         struct lg4ff_device_entry *entry;
1086         unsigned long flags;
1087         s32 *value;
1088
1089         drv_data = hid_get_drvdata(hid);
1090         if (!drv_data) {
1091                 hid_err(hid, "Private driver data not found!\n");
1092                 return;
1093         }
1094
1095         entry = drv_data->device_props;
1096         if (!entry) {
1097                 hid_err(hid, "Device properties not found!\n");
1098                 return;
1099         }
1100         value = entry->report->field[0]->value;
1101
1102         spin_lock_irqsave(&entry->report_lock, flags);
1103         value[0] = 0xf8;
1104         value[1] = 0x12;
1105         value[2] = leds;
1106         value[3] = 0x00;
1107         value[4] = 0x00;
1108         value[5] = 0x00;
1109         value[6] = 0x00;
1110         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
1111         spin_unlock_irqrestore(&entry->report_lock, flags);
1112 }
1113
1114 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
1115                         enum led_brightness value)
1116 {
1117         struct device *dev = led_cdev->dev->parent;
1118         struct hid_device *hid = to_hid_device(dev);
1119         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
1120         struct lg4ff_device_entry *entry;
1121         int i, state = 0;
1122
1123         if (!drv_data) {
1124                 hid_err(hid, "Device data not found.");
1125                 return;
1126         }
1127
1128         entry = drv_data->device_props;
1129
1130         if (!entry) {
1131                 hid_err(hid, "Device properties not found.");
1132                 return;
1133         }
1134
1135         for (i = 0; i < 5; i++) {
1136                 if (led_cdev != entry->wdata.led[i])
1137                         continue;
1138                 state = (entry->wdata.led_state >> i) & 1;
1139                 if (value == LED_OFF && state) {
1140                         entry->wdata.led_state &= ~(1 << i);
1141                         lg4ff_set_leds(hid, entry->wdata.led_state);
1142                 } else if (value != LED_OFF && !state) {
1143                         entry->wdata.led_state |= 1 << i;
1144                         lg4ff_set_leds(hid, entry->wdata.led_state);
1145                 }
1146                 break;
1147         }
1148 }
1149
1150 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
1151 {
1152         struct device *dev = led_cdev->dev->parent;
1153         struct hid_device *hid = to_hid_device(dev);
1154         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
1155         struct lg4ff_device_entry *entry;
1156         int i, value = 0;
1157
1158         if (!drv_data) {
1159                 hid_err(hid, "Device data not found.");
1160                 return LED_OFF;
1161         }
1162
1163         entry = drv_data->device_props;
1164
1165         if (!entry) {
1166                 hid_err(hid, "Device properties not found.");
1167                 return LED_OFF;
1168         }
1169
1170         for (i = 0; i < 5; i++)
1171                 if (led_cdev == entry->wdata.led[i]) {
1172                         value = (entry->wdata.led_state >> i) & 1;
1173                         break;
1174                 }
1175
1176         return value ? LED_FULL : LED_OFF;
1177 }
1178 #endif
1179
1180 static u16 lg4ff_identify_multimode_wheel(struct hid_device *hid, const u16 reported_product_id, const u16 bcdDevice)
1181 {
1182         u32 current_mode;
1183         int i;
1184
1185         /* identify current mode from USB PID */
1186         for (i = 1; i < ARRAY_SIZE(lg4ff_alternate_modes); i++) {
1187                 dbg_hid("Testing whether PID is %X\n", lg4ff_alternate_modes[i].product_id);
1188                 if (reported_product_id == lg4ff_alternate_modes[i].product_id)
1189                         break;
1190         }
1191
1192         if (i == ARRAY_SIZE(lg4ff_alternate_modes))
1193                 return 0;
1194
1195         current_mode = BIT(i);
1196
1197         for (i = 0; i < ARRAY_SIZE(lg4ff_main_checklist); i++) {
1198                 const u16 mask = lg4ff_main_checklist[i]->mask;
1199                 const u16 result = lg4ff_main_checklist[i]->result;
1200                 const u16 real_product_id = lg4ff_main_checklist[i]->real_product_id;
1201
1202                 if ((current_mode & lg4ff_main_checklist[i]->modes) && \
1203                                 (bcdDevice & mask) == result) {
1204                         dbg_hid("Found wheel with real PID %X whose reported PID is %X\n", real_product_id, reported_product_id);
1205                         return real_product_id;
1206                 }
1207         }
1208
1209         /* No match found. This is either Driving Force or an unknown
1210          * wheel model, do not touch it */
1211         dbg_hid("Wheel with bcdDevice %X was not recognized as multimode wheel, leaving in its current mode\n", bcdDevice);
1212         return 0;
1213 }
1214
1215 static int lg4ff_handle_multimode_wheel(struct hid_device *hid, u16 *real_product_id, const u16 bcdDevice)
1216 {
1217         const u16 reported_product_id = hid->product;
1218         int ret;
1219
1220         *real_product_id = lg4ff_identify_multimode_wheel(hid, reported_product_id, bcdDevice);
1221         /* Probed wheel is not a multimode wheel */
1222         if (!*real_product_id) {
1223                 *real_product_id = reported_product_id;
1224                 dbg_hid("Wheel is not a multimode wheel\n");
1225                 return LG4FF_MMODE_NOT_MULTIMODE;
1226         }
1227
1228         /* Switch from "Driving Force" mode to native mode automatically.
1229          * Otherwise keep the wheel in its current mode */
1230         if (reported_product_id == USB_DEVICE_ID_LOGITECH_WHEEL &&
1231             reported_product_id != *real_product_id &&
1232             !lg4ff_no_autoswitch) {
1233                 const struct lg4ff_compat_mode_switch *s = lg4ff_get_mode_switch_command(*real_product_id, *real_product_id);
1234
1235                 if (!s) {
1236                         hid_err(hid, "Invalid product id %X\n", *real_product_id);
1237                         return LG4FF_MMODE_NOT_MULTIMODE;
1238                 }
1239
1240                 ret = lg4ff_switch_compatibility_mode(hid, s);
1241                 if (ret) {
1242                         /* Wheel could not have been switched to native mode,
1243                          * leave it in "Driving Force" mode and continue */
1244                         hid_err(hid, "Unable to switch wheel mode, errno %d\n", ret);
1245                         return LG4FF_MMODE_IS_MULTIMODE;
1246                 }
1247                 return LG4FF_MMODE_SWITCHED;
1248         }
1249
1250         return LG4FF_MMODE_IS_MULTIMODE;
1251 }
1252
1253
1254 int lg4ff_init(struct hid_device *hid)
1255 {
1256         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
1257         struct input_dev *dev = hidinput->input;
1258         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
1259         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
1260         const struct usb_device_descriptor *udesc = &(hid_to_usb_dev(hid)->descriptor);
1261         const u16 bcdDevice = le16_to_cpu(udesc->bcdDevice);
1262         const struct lg4ff_multimode_wheel *mmode_wheel = NULL;
1263         struct lg4ff_device_entry *entry;
1264         struct lg_drv_data *drv_data;
1265         int error, i, j;
1266         int mmode_ret, mmode_idx = -1;
1267         u16 real_product_id;
1268
1269         /* Check that the report looks ok */
1270         if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
1271                 return -1;
1272
1273         drv_data = hid_get_drvdata(hid);
1274         if (!drv_data) {
1275                 hid_err(hid, "Cannot add device, private driver data not allocated\n");
1276                 return -1;
1277         }
1278         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1279         if (!entry)
1280                 return -ENOMEM;
1281         spin_lock_init(&entry->report_lock);
1282         entry->report = report;
1283         drv_data->device_props = entry;
1284
1285         /* Check if a multimode wheel has been connected and
1286          * handle it appropriately */
1287         mmode_ret = lg4ff_handle_multimode_wheel(hid, &real_product_id, bcdDevice);
1288
1289         /* Wheel has been told to switch to native mode. There is no point in going on
1290          * with the initialization as the wheel will do a USB reset when it switches mode
1291          */
1292         if (mmode_ret == LG4FF_MMODE_SWITCHED)
1293                 return 0;
1294         else if (mmode_ret < 0) {
1295                 hid_err(hid, "Unable to switch device mode during initialization, errno %d\n", mmode_ret);
1296                 error = mmode_ret;
1297                 goto err_init;
1298         }
1299
1300         /* Check what wheel has been connected */
1301         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
1302                 if (hid->product == lg4ff_devices[i].product_id) {
1303                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
1304                         break;
1305                 }
1306         }
1307
1308         if (i == ARRAY_SIZE(lg4ff_devices)) {
1309                 hid_err(hid, "This device is flagged to be handled by the lg4ff module but this module does not know how to handle it. "
1310                              "Please report this as a bug to LKML, Simon Wood <simon@mungewell.org> or "
1311                              "Michal Maly <madcatxster@devoid-pointer.net>\n");
1312                 error = -1;
1313                 goto err_init;
1314         }
1315
1316         if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
1317                 for (mmode_idx = 0; mmode_idx < ARRAY_SIZE(lg4ff_multimode_wheels); mmode_idx++) {
1318                         if (real_product_id == lg4ff_multimode_wheels[mmode_idx].product_id)
1319                                 break;
1320                 }
1321
1322                 if (mmode_idx == ARRAY_SIZE(lg4ff_multimode_wheels)) {
1323                         hid_err(hid, "Device product ID %X is not listed as a multimode wheel", real_product_id);
1324                         error = -1;
1325                         goto err_init;
1326                 }
1327         }
1328
1329         /* Set supported force feedback capabilities */
1330         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
1331                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
1332
1333         error = input_ff_create_memless(dev, NULL, lg4ff_play);
1334
1335         if (error)
1336                 goto err_init;
1337
1338         /* Initialize device properties */
1339         if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
1340                 BUG_ON(mmode_idx == -1);
1341                 mmode_wheel = &lg4ff_multimode_wheels[mmode_idx];
1342         }
1343         lg4ff_init_wheel_data(&entry->wdata, &lg4ff_devices[i], mmode_wheel, real_product_id);
1344
1345         /* Check if autocentering is available and
1346          * set the centering force to zero by default */
1347         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
1348                 /* Formula Force EX expects different autocentering command */
1349                 if ((bcdDevice >> 8) == LG4FF_FFEX_REV_MAJ &&
1350                     (bcdDevice & 0xff) == LG4FF_FFEX_REV_MIN)
1351                         dev->ff->set_autocenter = lg4ff_set_autocenter_ffex;
1352                 else
1353                         dev->ff->set_autocenter = lg4ff_set_autocenter_default;
1354
1355                 dev->ff->set_autocenter(dev, 0);
1356         }
1357
1358         /* Create sysfs interface */
1359         error = device_create_file(&hid->dev, &dev_attr_combine_pedals);
1360         if (error)
1361                 hid_warn(hid, "Unable to create sysfs interface for \"combine\", errno %d\n", error);
1362         error = device_create_file(&hid->dev, &dev_attr_range);
1363         if (error)
1364                 hid_warn(hid, "Unable to create sysfs interface for \"range\", errno %d\n", error);
1365         if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
1366                 error = device_create_file(&hid->dev, &dev_attr_real_id);
1367                 if (error)
1368                         hid_warn(hid, "Unable to create sysfs interface for \"real_id\", errno %d\n", error);
1369                 error = device_create_file(&hid->dev, &dev_attr_alternate_modes);
1370                 if (error)
1371                         hid_warn(hid, "Unable to create sysfs interface for \"alternate_modes\", errno %d\n", error);
1372         }
1373         dbg_hid("sysfs interface created\n");
1374
1375         /* Set the maximum range to start with */
1376         entry->wdata.range = entry->wdata.max_range;
1377         if (entry->wdata.set_range)
1378                 entry->wdata.set_range(hid, entry->wdata.range);
1379
1380 #ifdef CONFIG_LEDS_CLASS
1381         /* register led subsystem - G27/G29 only */
1382         entry->wdata.led_state = 0;
1383         for (j = 0; j < 5; j++)
1384                 entry->wdata.led[j] = NULL;
1385
1386         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL ||
1387                         lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G29_WHEEL) {
1388                 struct led_classdev *led;
1389                 size_t name_sz;
1390                 char *name;
1391
1392                 lg4ff_set_leds(hid, 0);
1393
1394                 name_sz = strlen(dev_name(&hid->dev)) + 8;
1395
1396                 for (j = 0; j < 5; j++) {
1397                         led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
1398                         if (!led) {
1399                                 hid_err(hid, "can't allocate memory for LED %d\n", j);
1400                                 goto err_leds;
1401                         }
1402
1403                         name = (void *)(&led[1]);
1404                         snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
1405                         led->name = name;
1406                         led->brightness = 0;
1407                         led->max_brightness = 1;
1408                         led->brightness_get = lg4ff_led_get_brightness;
1409                         led->brightness_set = lg4ff_led_set_brightness;
1410
1411                         entry->wdata.led[j] = led;
1412                         error = led_classdev_register(&hid->dev, led);
1413
1414                         if (error) {
1415                                 hid_err(hid, "failed to register LED %d. Aborting.\n", j);
1416 err_leds:
1417                                 /* Deregister LEDs (if any) */
1418                                 for (j = 0; j < 5; j++) {
1419                                         led = entry->wdata.led[j];
1420                                         entry->wdata.led[j] = NULL;
1421                                         if (!led)
1422                                                 continue;
1423                                         led_classdev_unregister(led);
1424                                         kfree(led);
1425                                 }
1426                                 goto out;       /* Let the driver continue without LEDs */
1427                         }
1428                 }
1429         }
1430 out:
1431 #endif
1432         hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
1433         return 0;
1434
1435 err_init:
1436         drv_data->device_props = NULL;
1437         kfree(entry);
1438         return error;
1439 }
1440
1441 int lg4ff_deinit(struct hid_device *hid)
1442 {
1443         struct lg4ff_device_entry *entry;
1444         struct lg_drv_data *drv_data;
1445
1446         drv_data = hid_get_drvdata(hid);
1447         if (!drv_data) {
1448                 hid_err(hid, "Error while deinitializing device, no private driver data.\n");
1449                 return -1;
1450         }
1451         entry = drv_data->device_props;
1452         if (!entry)
1453                 goto out; /* Nothing more to do */
1454
1455         /* Multimode devices will have at least the "MODE_NATIVE" bit set */
1456         if (entry->wdata.alternate_modes) {
1457                 device_remove_file(&hid->dev, &dev_attr_real_id);
1458                 device_remove_file(&hid->dev, &dev_attr_alternate_modes);
1459         }
1460
1461         device_remove_file(&hid->dev, &dev_attr_combine_pedals);
1462         device_remove_file(&hid->dev, &dev_attr_range);
1463 #ifdef CONFIG_LEDS_CLASS
1464         {
1465                 int j;
1466                 struct led_classdev *led;
1467
1468                 /* Deregister LEDs (if any) */
1469                 for (j = 0; j < 5; j++) {
1470
1471                         led = entry->wdata.led[j];
1472                         entry->wdata.led[j] = NULL;
1473                         if (!led)
1474                                 continue;
1475                         led_classdev_unregister(led);
1476                         kfree(led);
1477                 }
1478         }
1479 #endif
1480         hid_hw_stop(hid);
1481         drv_data->device_props = NULL;
1482
1483         kfree(entry);
1484 out:
1485         dbg_hid("Device successfully unregistered\n");
1486         return 0;
1487 }