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
 876         if (i == 0) {
 877                 kfree(lbuf);
 878                 return -EINVAL;
 879         }
 880
 881         if (lbuf[i-1] == '\n') {
 882                 if (i == 1) {
 883                         kfree(lbuf);
 884                         return -EINVAL;
 885                 }
 886                 lbuf[i-1] = '\0';
 887         }
 888
 889         for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) {
 890                 const u16 mode_product_id = lg4ff_alternate_modes[i].product_id;
 891                 const char *tag = lg4ff_alternate_modes[i].tag;
 892
 893                 if (entry->wdata.alternate_modes & BIT(i)) {
 894                         if (!strcmp(tag, lbuf)) {
 895                                 if (!mode_product_id)
 896                                         target_product_id = entry->wdata.real_product_id;
 897                                 else
 898                                         target_product_id = mode_product_id;
 899                                 break;
 900                         }
 901                 }
 902         }
 903
 904         if (i == LG4FF_MODE_MAX_IDX) {
 905                 hid_info(hid, "Requested mode \"%s\" is not supported by the device\n", lbuf);
 906                 kfree(lbuf);
 907                 return -EINVAL;
 908         }
 909         kfree(lbuf); /* Not needed anymore */
 910
 911         if (target_product_id == entry->wdata.product_id) /* Nothing to do */
 912                 return count;
 913
 914         /* Automatic switching has to be disabled for the switch to DF-EX mode to work correctly */
 915         if (target_product_id == USB_DEVICE_ID_LOGITECH_WHEEL && !lg4ff_no_autoswitch) {
 916                 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",
 917                          entry->wdata.real_name);
 918                 return -EINVAL;
 919         }
 920
 921         /* Take care of hardware limitations */
 922         if ((entry->wdata.real_product_id == USB_DEVICE_ID_LOGITECH_DFP_WHEEL || entry->wdata.real_product_id == USB_DEVICE_ID_LOGITECH_G25_WHEEL) &&
 923             entry->wdata.product_id > target_product_id) {
 924                 hid_info(hid, "\"%s\" cannot be switched back into \"%s\" mode\n", entry->wdata.real_name, lg4ff_alternate_modes[i].name);
 925                 return -EINVAL;
 926         }
 927
 928         s = lg4ff_get_mode_switch_command(entry->wdata.real_product_id, target_product_id);
 929         if (!s) {
 930                 hid_err(hid, "Invalid target product ID %X\n", target_product_id);
 931                 return -EINVAL;
 932         }
 933
 934         ret = lg4ff_switch_compatibility_mode(hid, s);
 935         return (ret == 0 ? count : ret);
 936 }
 937 static DEVICE_ATTR(alternate_modes, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_alternate_modes_show, lg4ff_alternate_modes_store);
 938
 939 static ssize_t lg4ff_combine_show(struct device *dev, struct device_attribute *attr,
 940                                 char *buf)
 941 {
 942         struct hid_device *hid = to_hid_device(dev);
 943         struct lg4ff_device_entry *entry;
 944         struct lg_drv_data *drv_data;
 945         size_t count;
 946
 947         drv_data = hid_get_drvdata(hid);
 948         if (!drv_data) {
 949                 hid_err(hid, "Private driver data not found!\n");
 950                 return 0;
 951         }
 952
 953         entry = drv_data->device_props;
 954         if (!entry) {
 955                 hid_err(hid, "Device properties not found!\n");
 956                 return 0;
 957         }
 958
 959         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.combine);
 960         return count;
 961 }
 962
 963 static ssize_t lg4ff_combine_store(struct device *dev, struct device_attribute *attr,
 964                                  const char *buf, size_t count)
 965 {
 966         struct hid_device *hid = to_hid_device(dev);
 967         struct lg4ff_device_entry *entry;
 968         struct lg_drv_data *drv_data;
 969         u16 combine = simple_strtoul(buf, NULL, 10);
 970
 971         drv_data = hid_get_drvdata(hid);
 972         if (!drv_data) {
 973                 hid_err(hid, "Private driver data not found!\n");
 974                 return -EINVAL;
 975         }
 976
 977         entry = drv_data->device_props;
 978         if (!entry) {
 979                 hid_err(hid, "Device properties not found!\n");
 980                 return -EINVAL;
 981         }
 982
 983         if (combine > 1)
 984                 combine = 1;
 985
 986         entry->wdata.combine = combine;
 987         return count;
 988 }
 989 static DEVICE_ATTR(combine_pedals, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_combine_show, lg4ff_combine_store);
 990
 991 /* Export the currently set range of the wheel */
 992 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr,
 993                                 char *buf)
 994 {
 995         struct hid_device *hid = to_hid_device(dev);
 996         struct lg4ff_device_entry *entry;
 997         struct lg_drv_data *drv_data;
 998         size_t count;
 999
1000         drv_data = hid_get_drvdata(hid);
1001         if (!drv_data) {
1002                 hid_err(hid, "Private driver data not found!\n");
1003                 return 0;
1004         }
1005
1006         entry = drv_data->device_props;
1007         if (!entry) {
1008                 hid_err(hid, "Device properties not found!\n");
1009                 return 0;
1010         }
1011
1012         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.range);
1013         return count;
1014 }
1015
1016 /* Set range to user specified value, call appropriate function
1017  * according to the type of the wheel */
1018 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr,
1019                                  const char *buf, size_t count)
1020 {
1021         struct hid_device *hid = to_hid_device(dev);
1022         struct lg4ff_device_entry *entry;
1023         struct lg_drv_data *drv_data;
1024         u16 range = simple_strtoul(buf, NULL, 10);
1025
1026         drv_data = hid_get_drvdata(hid);
1027         if (!drv_data) {
1028                 hid_err(hid, "Private driver data not found!\n");
1029                 return -EINVAL;
1030         }
1031
1032         entry = drv_data->device_props;
1033         if (!entry) {
1034                 hid_err(hid, "Device properties not found!\n");
1035                 return -EINVAL;
1036         }
1037
1038         if (range == 0)
1039                 range = entry->wdata.max_range;
1040
1041         /* Check if the wheel supports range setting
1042          * and that the range is within limits for the wheel */
1043         if (entry->wdata.set_range && range >= entry->wdata.min_range && range <= entry->wdata.max_range) {
1044                 entry->wdata.set_range(hid, range);
1045                 entry->wdata.range = range;
1046         }
1047
1048         return count;
1049 }
1050 static DEVICE_ATTR(range, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_range_show, lg4ff_range_store);
1051
1052 static ssize_t lg4ff_real_id_show(struct device *dev, struct device_attribute *attr, char *buf)
1053 {
1054         struct hid_device *hid = to_hid_device(dev);
1055         struct lg4ff_device_entry *entry;
1056         struct lg_drv_data *drv_data;
1057         size_t count;
1058
1059         drv_data = hid_get_drvdata(hid);
1060         if (!drv_data) {
1061                 hid_err(hid, "Private driver data not found!\n");
1062                 return 0;
1063         }
1064
1065         entry = drv_data->device_props;
1066         if (!entry) {
1067                 hid_err(hid, "Device properties not found!\n");
1068                 return 0;
1069         }
1070
1071         if (!entry->wdata.real_tag || !entry->wdata.real_name) {
1072                 hid_err(hid, "NULL pointer to string\n");
1073                 return 0;
1074         }
1075
1076         count = scnprintf(buf, PAGE_SIZE, "%s: %s\n", entry->wdata.real_tag, entry->wdata.real_name);
1077         return count;
1078 }
1079
1080 static ssize_t lg4ff_real_id_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1081 {
1082         /* Real ID is a read-only value */
1083         return -EPERM;
1084 }
1085 static DEVICE_ATTR(real_id, S_IRUGO, lg4ff_real_id_show, lg4ff_real_id_store);
1086
1087 #ifdef CONFIG_LEDS_CLASS
1088 static void lg4ff_set_leds(struct hid_device *hid, u8 leds)
1089 {
1090         struct lg_drv_data *drv_data;
1091         struct lg4ff_device_entry *entry;
1092         unsigned long flags;
1093         s32 *value;
1094
1095         drv_data = hid_get_drvdata(hid);
1096         if (!drv_data) {
1097                 hid_err(hid, "Private driver data not found!\n");
1098                 return;
1099         }
1100
1101         entry = drv_data->device_props;
1102         if (!entry) {
1103                 hid_err(hid, "Device properties not found!\n");
1104                 return;
1105         }
1106         value = entry->report->field[0]->value;
1107
1108         spin_lock_irqsave(&entry->report_lock, flags);
1109         value[0] = 0xf8;
1110         value[1] = 0x12;
1111         value[2] = leds;
1112         value[3] = 0x00;
1113         value[4] = 0x00;
1114         value[5] = 0x00;
1115         value[6] = 0x00;
1116         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
1117         spin_unlock_irqrestore(&entry->report_lock, flags);
1118 }
1119
1120 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
1121                         enum led_brightness value)
1122 {
1123         struct device *dev = led_cdev->dev->parent;
1124         struct hid_device *hid = to_hid_device(dev);
1125         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
1126         struct lg4ff_device_entry *entry;
1127         int i, state = 0;
1128
1129         if (!drv_data) {
1130                 hid_err(hid, "Device data not found.");
1131                 return;
1132         }
1133
1134         entry = drv_data->device_props;
1135
1136         if (!entry) {
1137                 hid_err(hid, "Device properties not found.");
1138                 return;
1139         }
1140
1141         for (i = 0; i < 5; i++) {
1142                 if (led_cdev != entry->wdata.led[i])
1143                         continue;
1144                 state = (entry->wdata.led_state >> i) & 1;
1145                 if (value == LED_OFF && state) {
1146                         entry->wdata.led_state &= ~(1 << i);
1147                         lg4ff_set_leds(hid, entry->wdata.led_state);
1148                 } else if (value != LED_OFF && !state) {
1149                         entry->wdata.led_state |= 1 << i;
1150                         lg4ff_set_leds(hid, entry->wdata.led_state);
1151                 }
1152                 break;
1153         }
1154 }
1155
1156 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
1157 {
1158         struct device *dev = led_cdev->dev->parent;
1159         struct hid_device *hid = to_hid_device(dev);
1160         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
1161         struct lg4ff_device_entry *entry;
1162         int i, value = 0;
1163
1164         if (!drv_data) {
1165                 hid_err(hid, "Device data not found.");
1166                 return LED_OFF;
1167         }
1168
1169         entry = drv_data->device_props;
1170
1171         if (!entry) {
1172                 hid_err(hid, "Device properties not found.");
1173                 return LED_OFF;
1174         }
1175
1176         for (i = 0; i < 5; i++)
1177                 if (led_cdev == entry->wdata.led[i]) {
1178                         value = (entry->wdata.led_state >> i) & 1;
1179                         break;
1180                 }
1181
1182         return value ? LED_FULL : LED_OFF;
1183 }
1184 #endif
1185
1186 static u16 lg4ff_identify_multimode_wheel(struct hid_device *hid, const u16 reported_product_id, const u16 bcdDevice)
1187 {
1188         u32 current_mode;
1189         int i;
1190
1191         /* identify current mode from USB PID */
1192         for (i = 1; i < ARRAY_SIZE(lg4ff_alternate_modes); i++) {
1193                 dbg_hid("Testing whether PID is %X\n", lg4ff_alternate_modes[i].product_id);
1194                 if (reported_product_id == lg4ff_alternate_modes[i].product_id)
1195                         break;
1196         }
1197
1198         if (i == ARRAY_SIZE(lg4ff_alternate_modes))
1199                 return 0;
1200
1201         current_mode = BIT(i);
1202
1203         for (i = 0; i < ARRAY_SIZE(lg4ff_main_checklist); i++) {
1204                 const u16 mask = lg4ff_main_checklist[i]->mask;
1205                 const u16 result = lg4ff_main_checklist[i]->result;
1206                 const u16 real_product_id = lg4ff_main_checklist[i]->real_product_id;
1207
1208                 if ((current_mode & lg4ff_main_checklist[i]->modes) && \
1209                                 (bcdDevice & mask) == result) {
1210                         dbg_hid("Found wheel with real PID %X whose reported PID is %X\n", real_product_id, reported_product_id);
1211                         return real_product_id;
1212                 }
1213         }
1214
1215         /* No match found. This is either Driving Force or an unknown
1216          * wheel model, do not touch it */
1217         dbg_hid("Wheel with bcdDevice %X was not recognized as multimode wheel, leaving in its current mode\n", bcdDevice);
1218         return 0;
1219 }
1220
1221 static int lg4ff_handle_multimode_wheel(struct hid_device *hid, u16 *real_product_id, const u16 bcdDevice)
1222 {
1223         const u16 reported_product_id = hid->product;
1224         int ret;
1225
1226         *real_product_id = lg4ff_identify_multimode_wheel(hid, reported_product_id, bcdDevice);
1227         /* Probed wheel is not a multimode wheel */
1228         if (!*real_product_id) {
1229                 *real_product_id = reported_product_id;
1230                 dbg_hid("Wheel is not a multimode wheel\n");
1231                 return LG4FF_MMODE_NOT_MULTIMODE;
1232         }
1233
1234         /* Switch from "Driving Force" mode to native mode automatically.
1235          * Otherwise keep the wheel in its current mode */
1236         if (reported_product_id == USB_DEVICE_ID_LOGITECH_WHEEL &&
1237             reported_product_id != *real_product_id &&
1238             !lg4ff_no_autoswitch) {
1239                 const struct lg4ff_compat_mode_switch *s = lg4ff_get_mode_switch_command(*real_product_id, *real_product_id);
1240
1241                 if (!s) {
1242                         hid_err(hid, "Invalid product id %X\n", *real_product_id);
1243                         return LG4FF_MMODE_NOT_MULTIMODE;
1244                 }
1245
1246                 ret = lg4ff_switch_compatibility_mode(hid, s);
1247                 if (ret) {
1248                         /* Wheel could not have been switched to native mode,
1249                          * leave it in "Driving Force" mode and continue */
1250                         hid_err(hid, "Unable to switch wheel mode, errno %d\n", ret);
1251                         return LG4FF_MMODE_IS_MULTIMODE;
1252                 }
1253                 return LG4FF_MMODE_SWITCHED;
1254         }
1255
1256         return LG4FF_MMODE_IS_MULTIMODE;
1257 }
1258
1259
1260 int lg4ff_init(struct hid_device *hid)
1261 {
1262         struct hid_input *hidinput;
1263         struct input_dev *dev;
1264         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
1265         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
1266         const struct usb_device_descriptor *udesc = &(hid_to_usb_dev(hid)->descriptor);
1267         const u16 bcdDevice = le16_to_cpu(udesc->bcdDevice);
1268         const struct lg4ff_multimode_wheel *mmode_wheel = NULL;
1269         struct lg4ff_device_entry *entry;
1270         struct lg_drv_data *drv_data;
1271         int error, i, j;
1272         int mmode_ret, mmode_idx = -1;
1273         u16 real_product_id;
1274
1275         if (list_empty(&hid->inputs)) {
1276                 hid_err(hid, "no inputs found\n");
1277                 return -ENODEV;
1278         }
1279         hidinput = list_entry(hid->inputs.next, struct hid_input, list);
1280         dev = hidinput->input;
1281
1282         /* Check that the report looks ok */
1283         if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
1284                 return -1;
1285
1286         drv_data = hid_get_drvdata(hid);
1287         if (!drv_data) {
1288                 hid_err(hid, "Cannot add device, private driver data not allocated\n");
1289                 return -1;
1290         }
1291         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1292         if (!entry)
1293                 return -ENOMEM;
1294         spin_lock_init(&entry->report_lock);
1295         entry->report = report;
1296         drv_data->device_props = entry;
1297
1298         /* Check if a multimode wheel has been connected and
1299          * handle it appropriately */
1300         mmode_ret = lg4ff_handle_multimode_wheel(hid, &real_product_id, bcdDevice);
1301
1302         /* Wheel has been told to switch to native mode. There is no point in going on
1303          * with the initialization as the wheel will do a USB reset when it switches mode
1304          */
1305         if (mmode_ret == LG4FF_MMODE_SWITCHED)
1306                 return 0;
1307         else if (mmode_ret < 0) {
1308                 hid_err(hid, "Unable to switch device mode during initialization, errno %d\n", mmode_ret);
1309                 error = mmode_ret;
1310                 goto err_init;
1311         }
1312
1313         /* Check what wheel has been connected */
1314         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
1315                 if (hid->product == lg4ff_devices[i].product_id) {
1316                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
1317                         break;
1318                 }
1319         }
1320
1321         if (i == ARRAY_SIZE(lg4ff_devices)) {
1322                 hid_err(hid, "This device is flagged to be handled by the lg4ff module but this module does not know how to handle it. "
1323                              "Please report this as a bug to LKML, Simon Wood <simon@mungewell.org> or "
1324                              "Michal Maly <madcatxster@devoid-pointer.net>\n");
1325                 error = -1;
1326                 goto err_init;
1327         }
1328
1329         if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
1330                 for (mmode_idx = 0; mmode_idx < ARRAY_SIZE(lg4ff_multimode_wheels); mmode_idx++) {
1331                         if (real_product_id == lg4ff_multimode_wheels[mmode_idx].product_id)
1332                                 break;
1333                 }
1334
1335                 if (mmode_idx == ARRAY_SIZE(lg4ff_multimode_wheels)) {
1336                         hid_err(hid, "Device product ID %X is not listed as a multimode wheel", real_product_id);
1337                         error = -1;
1338                         goto err_init;
1339                 }
1340         }
1341
1342         /* Set supported force feedback capabilities */
1343         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
1344                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
1345
1346         error = input_ff_create_memless(dev, NULL, lg4ff_play);
1347
1348         if (error)
1349                 goto err_init;
1350
1351         /* Initialize device properties */
1352         if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
1353                 BUG_ON(mmode_idx == -1);
1354                 mmode_wheel = &lg4ff_multimode_wheels[mmode_idx];
1355         }
1356         lg4ff_init_wheel_data(&entry->wdata, &lg4ff_devices[i], mmode_wheel, real_product_id);
1357
1358         /* Check if autocentering is available and
1359          * set the centering force to zero by default */
1360         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
1361                 /* Formula Force EX expects different autocentering command */
1362                 if ((bcdDevice >> 8) == LG4FF_FFEX_REV_MAJ &&
1363                     (bcdDevice & 0xff) == LG4FF_FFEX_REV_MIN)
1364                         dev->ff->set_autocenter = lg4ff_set_autocenter_ffex;
1365                 else
1366                         dev->ff->set_autocenter = lg4ff_set_autocenter_default;
1367
1368                 dev->ff->set_autocenter(dev, 0);
1369         }
1370
1371         /* Create sysfs interface */
1372         error = device_create_file(&hid->dev, &dev_attr_combine_pedals);
1373         if (error)
1374                 hid_warn(hid, "Unable to create sysfs interface for \"combine\", errno %d\n", error);
1375         error = device_create_file(&hid->dev, &dev_attr_range);
1376         if (error)
1377                 hid_warn(hid, "Unable to create sysfs interface for \"range\", errno %d\n", error);
1378         if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
1379                 error = device_create_file(&hid->dev, &dev_attr_real_id);
1380                 if (error)
1381                         hid_warn(hid, "Unable to create sysfs interface for \"real_id\", errno %d\n", error);
1382                 error = device_create_file(&hid->dev, &dev_attr_alternate_modes);
1383                 if (error)
1384                         hid_warn(hid, "Unable to create sysfs interface for \"alternate_modes\", errno %d\n", error);
1385         }
1386         dbg_hid("sysfs interface created\n");
1387
1388         /* Set the maximum range to start with */
1389         entry->wdata.range = entry->wdata.max_range;
1390         if (entry->wdata.set_range)
1391                 entry->wdata.set_range(hid, entry->wdata.range);
1392
1393 #ifdef CONFIG_LEDS_CLASS
1394         /* register led subsystem - G27/G29 only */
1395         entry->wdata.led_state = 0;
1396         for (j = 0; j < 5; j++)
1397                 entry->wdata.led[j] = NULL;
1398
1399         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL ||
1400                         lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G29_WHEEL) {
1401                 struct led_classdev *led;
1402                 size_t name_sz;
1403                 char *name;
1404
1405                 lg4ff_set_leds(hid, 0);
1406
1407                 name_sz = strlen(dev_name(&hid->dev)) + 8;
1408
1409                 for (j = 0; j < 5; j++) {
1410                         led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
1411                         if (!led) {
1412                                 hid_err(hid, "can't allocate memory for LED %d\n", j);
1413                                 goto err_leds;
1414                         }
1415
1416                         name = (void *)(&led[1]);
1417                         snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
1418                         led->name = name;
1419                         led->brightness = 0;
1420                         led->max_brightness = 1;
1421                         led->brightness_get = lg4ff_led_get_brightness;
1422                         led->brightness_set = lg4ff_led_set_brightness;
1423
1424                         entry->wdata.led[j] = led;
1425                         error = led_classdev_register(&hid->dev, led);
1426
1427                         if (error) {
1428                                 hid_err(hid, "failed to register LED %d. Aborting.\n", j);
1429 err_leds:
1430                                 /* Deregister LEDs (if any) */
1431                                 for (j = 0; j < 5; j++) {
1432                                         led = entry->wdata.led[j];
1433                                         entry->wdata.led[j] = NULL;
1434                                         if (!led)
1435                                                 continue;
1436                                         led_classdev_unregister(led);
1437                                         kfree(led);
1438                                 }
1439                                 goto out;       /* Let the driver continue without LEDs */
1440                         }
1441                 }
1442         }
1443 out:
1444 #endif
1445         hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
1446         return 0;
1447
1448 err_init:
1449         drv_data->device_props = NULL;
1450         kfree(entry);
1451         return error;
1452 }
1453
1454 int lg4ff_deinit(struct hid_device *hid)
1455 {
1456         struct lg4ff_device_entry *entry;
1457         struct lg_drv_data *drv_data;
1458
1459         drv_data = hid_get_drvdata(hid);
1460         if (!drv_data) {
1461                 hid_err(hid, "Error while deinitializing device, no private driver data.\n");
1462                 return -1;
1463         }
1464         entry = drv_data->device_props;
1465         if (!entry)
1466                 goto out; /* Nothing more to do */
1467
1468         /* Multimode devices will have at least the "MODE_NATIVE" bit set */
1469         if (entry->wdata.alternate_modes) {
1470                 device_remove_file(&hid->dev, &dev_attr_real_id);
1471                 device_remove_file(&hid->dev, &dev_attr_alternate_modes);
1472         }
1473
1474         device_remove_file(&hid->dev, &dev_attr_combine_pedals);
1475         device_remove_file(&hid->dev, &dev_attr_range);
1476 #ifdef CONFIG_LEDS_CLASS
1477         {
1478                 int j;
1479                 struct led_classdev *led;
1480
1481                 /* Deregister LEDs (if any) */
1482                 for (j = 0; j < 5; j++) {
1483
1484                         led = entry->wdata.led[j];
1485                         entry->wdata.led[j] = NULL;
1486                         if (!led)
1487                                 continue;
1488                         led_classdev_unregister(led);
1489                         kfree(led);
1490                 }
1491         }
1492 #endif
1493         drv_data->device_props = NULL;
1494
1495         kfree(entry);
1496 out:
1497         dbg_hid("Device successfully unregistered\n");
1498         return 0;
1499 }