drivers/hid/hid-lg4ff.c

   1 /*
   2  *  Force feedback support for Logitech Gaming Wheels
   3  *
   4  *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
   5  *  Speed Force Wireless (WiiWheel)
   6  *
   7  *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
   8  */
   9
  10 /*
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26
  27 #include <linux/input.h>
  28 #include <linux/usb.h>
  29 #include <linux/hid.h>
  30
  31 #include "usbhid/usbhid.h"
  32 #include "hid-lg.h"
  33 #include "hid-lg4ff.h"
  34 #include "hid-ids.h"
  35
  36 #define LG4FF_MMODE_IS_MULTIMODE 0
  37 #define LG4FF_MMODE_SWITCHED 1
  38 #define LG4FF_MMODE_NOT_MULTIMODE 2
  39
  40 #define LG4FF_MODE_NATIVE_IDX 0
  41 #define LG4FF_MODE_DFEX_IDX 1
  42 #define LG4FF_MODE_DFP_IDX 2
  43 #define LG4FF_MODE_G25_IDX 3
  44 #define LG4FF_MODE_DFGT_IDX 4
  45 #define LG4FF_MODE_G27_IDX 5
  46 #define LG4FF_MODE_G29_IDX 6
  47 #define LG4FF_MODE_MAX_IDX 7
  48
  49 #define LG4FF_MODE_NATIVE BIT(LG4FF_MODE_NATIVE_IDX)
  50 #define LG4FF_MODE_DFEX BIT(LG4FF_MODE_DFEX_IDX)
  51 #define LG4FF_MODE_DFP BIT(LG4FF_MODE_DFP_IDX)
  52 #define LG4FF_MODE_G25 BIT(LG4FF_MODE_G25_IDX)
  53 #define LG4FF_MODE_DFGT BIT(LG4FF_MODE_DFGT_IDX)
  54 #define LG4FF_MODE_G27 BIT(LG4FF_MODE_G27_IDX)
  55 #define LG4FF_MODE_G29 BIT(LG4FF_MODE_G29_IDX)
  56
  57 #define LG4FF_DFEX_TAG "DF-EX"
  58 #define LG4FF_DFEX_NAME "Driving Force / Formula EX"
  59 #define LG4FF_DFP_TAG "DFP"
  60 #define LG4FF_DFP_NAME "Driving Force Pro"
  61 #define LG4FF_G25_TAG "G25"
  62 #define LG4FF_G25_NAME "G25 Racing Wheel"
  63 #define LG4FF_G27_TAG "G27"
  64 #define LG4FF_G27_NAME "G27 Racing Wheel"
  65 #define LG4FF_G29_TAG "G29"
  66 #define LG4FF_G29_NAME "G29 Racing Wheel"
  67 #define LG4FF_DFGT_TAG "DFGT"
  68 #define LG4FF_DFGT_NAME "Driving Force GT"
  69
  70 #define LG4FF_FFEX_REV_MAJ 0x21
  71 #define LG4FF_FFEX_REV_MIN 0x00
  72
  73 static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
  74 static void lg4ff_set_range_g25(struct hid_device *hid, u16 range);
  75
  76 struct lg4ff_wheel_data {
  77         const u32 product_id;
  78         u16 combine;
  79         u16 range;
  80         const u16 min_range;
  81         const u16 max_range;
  82 #ifdef CONFIG_LEDS_CLASS
  83         u8  led_state;
  84         struct led_classdev *led[5];
  85 #endif
  86         const u32 alternate_modes;
  87         const char * const real_tag;
  88         const char * const real_name;
  89         const u16 real_product_id;
  90
  91         void (*set_range)(struct hid_device *hid, u16 range);
  92 };
  93
  94 struct lg4ff_device_entry {
  95         spinlock_t report_lock; /* Protect output HID report */
  96         struct hid_report *report;
  97         struct lg4ff_wheel_data wdata;
  98 };
  99
 100 static const signed short lg4ff_wheel_effects[] = {
 101         FF_CONSTANT,
 102         FF_AUTOCENTER,
 103         -1
 104 };
 105
 106 struct lg4ff_wheel {
 107         const u32 product_id;
 108         const signed short *ff_effects;
 109         const u16 min_range;
 110         const u16 max_range;
 111         void (*set_range)(struct hid_device *hid, u16 range);
 112 };
 113
 114 struct lg4ff_compat_mode_switch {
 115         const u8 cmd_count;     /* Number of commands to send */
 116         const u8 cmd[];
 117 };
 118
 119 struct lg4ff_wheel_ident_info {
 120         const u32 modes;
 121         const u16 mask;
 122         const u16 result;
 123         const u16 real_product_id;
 124 };
 125
 126 struct lg4ff_multimode_wheel {
 127         const u16 product_id;
 128         const u32 alternate_modes;
 129         const char *real_tag;
 130         const char *real_name;
 131 };
 132
 133 struct lg4ff_alternate_mode {
 134         const u16 product_id;
 135         const char *tag;
 136         const char *name;
 137 };
 138
 139 static const struct lg4ff_wheel lg4ff_devices[] = {
 140         {USB_DEVICE_ID_LOGITECH_WINGMAN_FFG, lg4ff_wheel_effects, 40, 180, NULL},
 141         {USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
 142         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
 143         {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_dfp},
 144         {USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
 145         {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
 146         {USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
 147         {USB_DEVICE_ID_LOGITECH_G29_WHEEL,   lg4ff_wheel_effects, 40, 900, lg4ff_set_range_g25},
 148         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
 149         {USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
 150 };
 151
 152 static const struct lg4ff_multimode_wheel lg4ff_multimode_wheels[] = {
 153         {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,
 154          LG4FF_MODE_NATIVE | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 155          LG4FF_DFP_TAG, LG4FF_DFP_NAME},
 156         {USB_DEVICE_ID_LOGITECH_G25_WHEEL,
 157          LG4FF_MODE_NATIVE | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 158          LG4FF_G25_TAG, LG4FF_G25_NAME},
 159         {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,
 160          LG4FF_MODE_NATIVE | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 161          LG4FF_DFGT_TAG, LG4FF_DFGT_NAME},
 162         {USB_DEVICE_ID_LOGITECH_G27_WHEEL,
 163          LG4FF_MODE_NATIVE | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 164          LG4FF_G27_TAG, LG4FF_G27_NAME},
 165         {USB_DEVICE_ID_LOGITECH_G29_WHEEL,
 166          LG4FF_MODE_NATIVE | LG4FF_MODE_G29 | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 167          LG4FF_G29_TAG, LG4FF_G29_NAME},
 168 };
 169
 170 static const struct lg4ff_alternate_mode lg4ff_alternate_modes[] = {
 171         [LG4FF_MODE_NATIVE_IDX] = {0, "native", ""},
 172         [LG4FF_MODE_DFEX_IDX] = {USB_DEVICE_ID_LOGITECH_WHEEL, LG4FF_DFEX_TAG, LG4FF_DFEX_NAME},
 173         [LG4FF_MODE_DFP_IDX] = {USB_DEVICE_ID_LOGITECH_DFP_WHEEL, LG4FF_DFP_TAG, LG4FF_DFP_NAME},
 174         [LG4FF_MODE_G25_IDX] = {USB_DEVICE_ID_LOGITECH_G25_WHEEL, LG4FF_G25_TAG, LG4FF_G25_NAME},
 175         [LG4FF_MODE_DFGT_IDX] = {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL, LG4FF_DFGT_TAG, LG4FF_DFGT_NAME},
 176         [LG4FF_MODE_G27_IDX] = {USB_DEVICE_ID_LOGITECH_G27_WHEEL, LG4FF_G27_TAG, LG4FF_G27_NAME},
 177         [LG4FF_MODE_G29_IDX] = {USB_DEVICE_ID_LOGITECH_G29_WHEEL, LG4FF_G29_TAG, LG4FF_G29_NAME},
 178 };
 179
 180 /* Multimode wheel identificators */
 181 static const struct lg4ff_wheel_ident_info lg4ff_dfp_ident_info = {
 182         LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 183         0xf000,
 184         0x1000,
 185         USB_DEVICE_ID_LOGITECH_DFP_WHEEL
 186 };
 187
 188 static const struct lg4ff_wheel_ident_info lg4ff_g25_ident_info = {
 189         LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 190         0xff00,
 191         0x1200,
 192         USB_DEVICE_ID_LOGITECH_G25_WHEEL
 193 };
 194
 195 static const struct lg4ff_wheel_ident_info lg4ff_g27_ident_info = {
 196         LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 197         0xfff0,
 198         0x1230,
 199         USB_DEVICE_ID_LOGITECH_G27_WHEEL
 200 };
 201
 202 static const struct lg4ff_wheel_ident_info lg4ff_dfgt_ident_info = {
 203         LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 204         0xff00,
 205         0x1300,
 206         USB_DEVICE_ID_LOGITECH_DFGT_WHEEL
 207 };
 208
 209 static const struct lg4ff_wheel_ident_info lg4ff_g29_ident_info = {
 210         LG4FF_MODE_G29 | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 211         0xfff8,
 212         0x1350,
 213         USB_DEVICE_ID_LOGITECH_G29_WHEEL
 214 };
 215
 216 static const struct lg4ff_wheel_ident_info lg4ff_g29_ident_info2 = {
 217         LG4FF_MODE_G29 | LG4FF_MODE_G27 | LG4FF_MODE_G25 | LG4FF_MODE_DFGT | LG4FF_MODE_DFP | LG4FF_MODE_DFEX,
 218         0xff00,
 219         0x8900,
 220         USB_DEVICE_ID_LOGITECH_G29_WHEEL
 221 };
 222
 223 /* Multimode wheel identification checklists */
 224 static const struct lg4ff_wheel_ident_info *lg4ff_main_checklist[] = {
 225         &lg4ff_g29_ident_info,
 226         &lg4ff_g29_ident_info2,
 227         &lg4ff_dfgt_ident_info,
 228         &lg4ff_g27_ident_info,
 229         &lg4ff_g25_ident_info,
 230         &lg4ff_dfp_ident_info
 231 };
 232
 233 /* Compatibility mode switching commands */
 234 /* EXT_CMD9 - Understood by G27 and DFGT */
 235 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfex = {
 236         2,
 237         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 238          0xf8, 0x09, 0x00, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to DF-EX with detach */
 239 };
 240
 241 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfp = {
 242         2,
 243         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 244          0xf8, 0x09, 0x01, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to DFP with detach */
 245 };
 246
 247 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g25 = {
 248         2,
 249         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 250          0xf8, 0x09, 0x02, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to G25 with detach */
 251 };
 252
 253 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_dfgt = {
 254         2,
 255         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 256          0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to DFGT with detach */
 257 };
 258
 259 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g27 = {
 260         2,
 261         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 262          0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}      /* Switch mode to G27 with detach */
 263 };
 264
 265 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext09_g29 = {
 266         2,
 267         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* Revert mode upon USB reset */
 268          0xf8, 0x09, 0x05, 0x01, 0x01, 0x00, 0x00}      /* Switch mode to G29 with detach */
 269 };
 270
 271 /* EXT_CMD1 - Understood by DFP, G25, G27 and DFGT */
 272 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext01_dfp = {
 273         1,
 274         {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
 275 };
 276
 277 /* EXT_CMD16 - Understood by G25 and G27 */
 278 static const struct lg4ff_compat_mode_switch lg4ff_mode_switch_ext16_g25 = {
 279         1,
 280         {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
 281 };
 282
 283 /* Recalculates X axis value accordingly to currently selected range */
 284 static s32 lg4ff_adjust_dfp_x_axis(s32 value, u16 range)
 285 {
 286         u16 max_range;
 287         s32 new_value;
 288
 289         if (range == 900)
 290                 return value;
 291         else if (range == 200)
 292                 return value;
 293         else if (range < 200)
 294                 max_range = 200;
 295         else
 296                 max_range = 900;
 297
 298         new_value = 8192 + mult_frac(value - 8192, max_range, range);
 299         if (new_value < 0)
 300                 return 0;
 301         else if (new_value > 16383)
 302                 return 16383;
 303         else
 304                 return new_value;
 305 }
 306
 307 int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
 308                              struct hid_usage *usage, s32 value, struct lg_drv_data *drv_data)
 309 {
 310         struct lg4ff_device_entry *entry = drv_data->device_props;
 311         s32 new_value = 0;
 312
 313         if (!entry) {
 314                 hid_err(hid, "Device properties not found");
 315                 return 0;
 316         }
 317
 318         switch (entry->wdata.product_id) {
 319         case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 320                 switch (usage->code) {
 321                 case ABS_X:
 322                         new_value = lg4ff_adjust_dfp_x_axis(value, entry->wdata.range);
 323                         input_event(field->hidinput->input, usage->type, usage->code, new_value);
 324                         return 1;
 325                 default:
 326                         return 0;
 327                 }
 328         default:
 329                 return 0;
 330         }
 331 }
 332
 333 int lg4ff_raw_event(struct hid_device *hdev, struct hid_report *report,
 334                 u8 *rd, int size, struct lg_drv_data *drv_data)
 335 {
 336         int offset;
 337         struct lg4ff_device_entry *entry = drv_data->device_props;
 338
 339         if (!entry)
 340                 return 0;
 341
 342         /* adjust HID report present combined pedals data */
 343         if (entry->wdata.combine) {
 344                 switch (entry->wdata.product_id) {
 345                 case USB_DEVICE_ID_LOGITECH_WHEEL:
 346                         rd[5] = rd[3];
 347                         rd[6] = 0x7F;
 348                         return 1;
 349                 case USB_DEVICE_ID_LOGITECH_WINGMAN_FFG:
 350                 case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
 351                 case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
 352                         rd[4] = rd[3];
 353                         rd[5] = 0x7F;
 354                         return 1;
 355                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 356                         rd[5] = rd[4];
 357                         rd[6] = 0x7F;
 358                         return 1;
 359                 case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 360                 case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
 361                         offset = 5;
 362                         break;
 363                 case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
 364                 case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
 365                         offset = 6;
 366                         break;
 367                 case USB_DEVICE_ID_LOGITECH_WII_WHEEL:
 368                         offset = 3;
 369                         break;
 370                 default:
 371                         return 0;
 372                 }
 373
 374                 /* Compute a combined axis when wheel does not supply it */
 375                 rd[offset] = (0xFF + rd[offset] - rd[offset+1]) >> 1;
 376                 rd[offset+1] = 0x7F;
 377                 return 1;
 378         }
 379
 380         return 0;
 381 }
 382
 383 static void lg4ff_init_wheel_data(struct lg4ff_wheel_data * const wdata, const struct lg4ff_wheel *wheel,
 384                                   const struct lg4ff_multimode_wheel *mmode_wheel,
 385                                   const u16 real_product_id)
 386 {
 387         u32 alternate_modes = 0;
 388         const char *real_tag = NULL;
 389         const char *real_name = NULL;
 390
 391         if (mmode_wheel) {
 392                 alternate_modes = mmode_wheel->alternate_modes;
 393                 real_tag = mmode_wheel->real_tag;
 394                 real_name = mmode_wheel->real_name;
 395         }
 396
 397         {
 398                 struct lg4ff_wheel_data t_wdata =  { .product_id = wheel->product_id,
 399                                                      .real_product_id = real_product_id,
 400                                                      .combine = 0,
 401                                                      .min_range = wheel->min_range,
 402                                                      .max_range = wheel->max_range,
 403                                                      .set_range = wheel->set_range,
 404                                                      .alternate_modes = alternate_modes,
 405                                                      .real_tag = real_tag,
 406                                                      .real_name = real_name };
 407
 408                 memcpy(wdata, &t_wdata, sizeof(t_wdata));
 409         }
 410 }
 411
 412 static int lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
 413 {
 414         struct hid_device *hid = input_get_drvdata(dev);
 415         struct lg4ff_device_entry *entry;
 416         struct lg_drv_data *drv_data;
 417         unsigned long flags;
 418         s32 *value;
 419         int x;
 420
 421         drv_data = hid_get_drvdata(hid);
 422         if (!drv_data) {
 423                 hid_err(hid, "Private driver data not found!\n");
 424                 return -EINVAL;
 425         }
 426
 427         entry = drv_data->device_props;
 428         if (!entry) {
 429                 hid_err(hid, "Device properties not found!\n");
 430                 return -EINVAL;
 431         }
 432         value = entry->report->field[0]->value;
 433
 434 #define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)
 435
 436         switch (effect->type) {
 437         case FF_CONSTANT:
 438                 x = effect->u.ramp.start_level + 0x80;  /* 0x80 is no force */
 439                 CLAMP(x);
 440
 441                 spin_lock_irqsave(&entry->report_lock, flags);
 442                 if (x == 0x80) {
 443                         /* De-activate force in slot-1*/
 444                         value[0] = 0x13;
 445                         value[1] = 0x00;
 446                         value[2] = 0x00;
 447                         value[3] = 0x00;
 448                         value[4] = 0x00;
 449                         value[5] = 0x00;
 450                         value[6] = 0x00;
 451
 452                         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 453                         spin_unlock_irqrestore(&entry->report_lock, flags);
 454                         return 0;
 455                 }
 456
 457                 value[0] = 0x11;        /* Slot 1 */
 458                 value[1] = 0x08;
 459                 value[2] = x;
 460                 value[3] = 0x80;
 461                 value[4] = 0x00;
 462                 value[5] = 0x00;
 463                 value[6] = 0x00;
 464
 465                 hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 466                 spin_unlock_irqrestore(&entry->report_lock, flags);
 467                 break;
 468         }
 469         return 0;
 470 }
 471
 472 /* Sends default autocentering command compatible with
 473  * all wheels except Formula Force EX */
 474 static void lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 475 {
 476         struct hid_device *hid = input_get_drvdata(dev);
 477         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 478         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 479         s32 *value = report->field[0]->value;
 480         u32 expand_a, expand_b;
 481         struct lg4ff_device_entry *entry;
 482         struct lg_drv_data *drv_data;
 483         unsigned long flags;
 484
 485         drv_data = hid_get_drvdata(hid);
 486         if (!drv_data) {
 487                 hid_err(hid, "Private driver data not found!\n");
 488                 return;
 489         }
 490
 491         entry = drv_data->device_props;
 492         if (!entry) {
 493                 hid_err(hid, "Device properties not found!\n");
 494                 return;
 495         }
 496         value = entry->report->field[0]->value;
 497
 498         /* De-activate Auto-Center */
 499         spin_lock_irqsave(&entry->report_lock, flags);
 500         if (magnitude == 0) {
 501                 value[0] = 0xf5;
 502                 value[1] = 0x00;
 503                 value[2] = 0x00;
 504                 value[3] = 0x00;
 505                 value[4] = 0x00;
 506                 value[5] = 0x00;
 507                 value[6] = 0x00;
 508
 509                 hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 510                 spin_unlock_irqrestore(&entry->report_lock, flags);
 511                 return;
 512         }
 513
 514         if (magnitude <= 0xaaaa) {
 515                 expand_a = 0x0c * magnitude;
 516                 expand_b = 0x80 * magnitude;
 517         } else {
 518                 expand_a = (0x0c * 0xaaaa) + 0x06 * (magnitude - 0xaaaa);
 519                 expand_b = (0x80 * 0xaaaa) + 0xff * (magnitude - 0xaaaa);
 520         }
 521
 522         /* Adjust for non-MOMO wheels */
 523         switch (entry->wdata.product_id) {
 524         case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
 525         case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
 526                 break;
 527         default:
 528                 expand_a = expand_a >> 1;
 529                 break;
 530         }
 531
 532         value[0] = 0xfe;
 533         value[1] = 0x0d;
 534         value[2] = expand_a / 0xaaaa;
 535         value[3] = expand_a / 0xaaaa;
 536         value[4] = expand_b / 0xaaaa;
 537         value[5] = 0x00;
 538         value[6] = 0x00;
 539
 540         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 541
 542         /* Activate Auto-Center */
 543         value[0] = 0x14;
 544         value[1] = 0x00;
 545         value[2] = 0x00;
 546         value[3] = 0x00;
 547         value[4] = 0x00;
 548         value[5] = 0x00;
 549         value[6] = 0x00;
 550
 551         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 552         spin_unlock_irqrestore(&entry->report_lock, flags);
 553 }
 554
 555 /* Sends autocentering command compatible with Formula Force EX */
 556 static void lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 557 {
 558         struct hid_device *hid = input_get_drvdata(dev);
 559         struct lg4ff_device_entry *entry;
 560         struct lg_drv_data *drv_data;
 561         unsigned long flags;
 562         s32 *value;
 563         magnitude = magnitude * 90 / 65535;
 564
 565         drv_data = hid_get_drvdata(hid);
 566         if (!drv_data) {
 567                 hid_err(hid, "Private driver data not found!\n");
 568                 return;
 569         }
 570
 571         entry = drv_data->device_props;
 572         if (!entry) {
 573                 hid_err(hid, "Device properties not found!\n");
 574                 return;
 575         }
 576         value = entry->report->field[0]->value;
 577
 578         spin_lock_irqsave(&entry->report_lock, flags);
 579         value[0] = 0xfe;
 580         value[1] = 0x03;
 581         value[2] = magnitude >> 14;
 582         value[3] = magnitude >> 14;
 583         value[4] = magnitude;
 584         value[5] = 0x00;
 585         value[6] = 0x00;
 586
 587         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 588         spin_unlock_irqrestore(&entry->report_lock, flags);
 589 }
 590
 591 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 592 static void lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 593 {
 594         struct lg4ff_device_entry *entry;
 595         struct lg_drv_data *drv_data;
 596         unsigned long flags;
 597         s32 *value;
 598
 599         drv_data = hid_get_drvdata(hid);
 600         if (!drv_data) {
 601                 hid_err(hid, "Private driver data not found!\n");
 602                 return;
 603         }
 604
 605         entry = drv_data->device_props;
 606         if (!entry) {
 607                 hid_err(hid, "Device properties not found!\n");
 608                 return;
 609         }
 610         value = entry->report->field[0]->value;
 611         dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 612
 613         spin_lock_irqsave(&entry->report_lock, flags);
 614         value[0] = 0xf8;
 615         value[1] = 0x81;
 616         value[2] = range & 0x00ff;
 617         value[3] = (range & 0xff00) >> 8;
 618         value[4] = 0x00;
 619         value[5] = 0x00;
 620         value[6] = 0x00;
 621
 622         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 623         spin_unlock_irqrestore(&entry->report_lock, flags);
 624 }
 625
 626 /* Sends commands to set range compatible with Driving Force Pro wheel */
 627 static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range)
 628 {
 629         struct lg4ff_device_entry *entry;
 630         struct lg_drv_data *drv_data;
 631         unsigned long flags;
 632         int start_left, start_right, full_range;
 633         s32 *value;
 634
 635         drv_data = hid_get_drvdata(hid);
 636         if (!drv_data) {
 637                 hid_err(hid, "Private driver data not found!\n");
 638                 return;
 639         }
 640
 641         entry = drv_data->device_props;
 642         if (!entry) {
 643                 hid_err(hid, "Device properties not found!\n");
 644                 return;
 645         }
 646         value = entry->report->field[0]->value;
 647         dbg_hid("Driving Force Pro: setting range to %u\n", range);
 648
 649         /* Prepare "coarse" limit command */
 650         spin_lock_irqsave(&entry->report_lock, flags);
 651         value[0] = 0xf8;
 652         value[1] = 0x00;        /* Set later */
 653         value[2] = 0x00;
 654         value[3] = 0x00;
 655         value[4] = 0x00;
 656         value[5] = 0x00;
 657         value[6] = 0x00;
 658
 659         if (range > 200) {
 660                 value[1] = 0x03;
 661                 full_range = 900;
 662         } else {
 663                 value[1] = 0x02;
 664                 full_range = 200;
 665         }
 666         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 667
 668         /* Prepare "fine" limit command */
 669         value[0] = 0x81;
 670         value[1] = 0x0b;
 671         value[2] = 0x00;
 672         value[3] = 0x00;
 673         value[4] = 0x00;
 674         value[5] = 0x00;
 675         value[6] = 0x00;
 676
 677         if (range == 200 || range == 900) {     /* Do not apply any fine limit */
 678                 hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 679                 spin_unlock_irqrestore(&entry->report_lock, flags);
 680                 return;
 681         }
 682
 683         /* Construct fine limit command */
 684         start_left = (((full_range - range + 1) * 2047) / full_range);
 685         start_right = 0xfff - start_left;
 686
 687         value[2] = start_left >> 4;
 688         value[3] = start_right >> 4;
 689         value[4] = 0xff;
 690         value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 691         value[6] = 0xff;
 692
 693         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 694         spin_unlock_irqrestore(&entry->report_lock, flags);
 695 }
 696
 697 static const struct lg4ff_compat_mode_switch *lg4ff_get_mode_switch_command(const u16 real_product_id, const u16 target_product_id)
 698 {
 699         switch (real_product_id) {
 700         case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 701                 switch (target_product_id) {
 702                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 703                         return &lg4ff_mode_switch_ext01_dfp;
 704                 /* DFP can only be switched to its native mode */
 705                 default:
 706                         return NULL;
 707                 }
 708                 break;
 709         case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 710                 switch (target_product_id) {
 711                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 712                         return &lg4ff_mode_switch_ext01_dfp;
 713                 case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 714                         return &lg4ff_mode_switch_ext16_g25;
 715                 /* G25 can only be switched to DFP mode or its native mode */
 716                 default:
 717                         return NULL;
 718                 }
 719                 break;
 720         case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
 721                 switch (target_product_id) {
 722                 case USB_DEVICE_ID_LOGITECH_WHEEL:
 723                         return &lg4ff_mode_switch_ext09_dfex;
 724                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 725                         return &lg4ff_mode_switch_ext09_dfp;
 726                 case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 727                         return &lg4ff_mode_switch_ext09_g25;
 728                 case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
 729                         return &lg4ff_mode_switch_ext09_g27;
 730                 /* G27 can only be switched to DF-EX, DFP, G25 or its native mode */
 731                 default:
 732                         return NULL;
 733                 }
 734                 break;
 735         case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
 736                 switch (target_product_id) {
 737                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 738                         return &lg4ff_mode_switch_ext09_dfp;
 739                 case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
 740                         return &lg4ff_mode_switch_ext09_dfgt;
 741                 case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
 742                         return &lg4ff_mode_switch_ext09_g25;
 743                 case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
 744                         return &lg4ff_mode_switch_ext09_g27;
 745                 case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
 746                         return &lg4ff_mode_switch_ext09_g29;
 747                 /* G29 can only be switched to DF-EX, DFP, DFGT, G25, G27 or its native mode */
 748                 default:
 749                         return NULL;
 750                 }
 751                 break;
 752         case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
 753                 switch (target_product_id) {
 754                 case USB_DEVICE_ID_LOGITECH_WHEEL:
 755                         return &lg4ff_mode_switch_ext09_dfex;
 756                 case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 757                         return &lg4ff_mode_switch_ext09_dfp;
 758                 case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
 759                         return &lg4ff_mode_switch_ext09_dfgt;
 760                 /* DFGT can only be switched to DF-EX, DFP or its native mode */
 761                 default:
 762                         return NULL;
 763                 }
 764                 break;
 765         /* No other wheels have multiple modes */
 766         default:
 767                 return NULL;
 768         }
 769 }
 770
 771 static int lg4ff_switch_compatibility_mode(struct hid_device *hid, const struct lg4ff_compat_mode_switch *s)
 772 {
 773         struct lg4ff_device_entry *entry;
 774         struct lg_drv_data *drv_data;
 775         unsigned long flags;
 776         s32 *value;
 777         u8 i;
 778
 779         drv_data = hid_get_drvdata(hid);
 780         if (!drv_data) {
 781                 hid_err(hid, "Private driver data not found!\n");
 782                 return -EINVAL;
 783         }
 784
 785         entry = drv_data->device_props;
 786         if (!entry) {
 787                 hid_err(hid, "Device properties not found!\n");
 788                 return -EINVAL;
 789         }
 790         value = entry->report->field[0]->value;
 791
 792         spin_lock_irqsave(&entry->report_lock, flags);
 793         for (i = 0; i < s->cmd_count; i++) {
 794                 u8 j;
 795
 796                 for (j = 0; j < 7; j++)
 797                         value[j] = s->cmd[j + (7*i)];
 798
 799                 hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 800         }
 801         spin_unlock_irqrestore(&entry->report_lock, flags);
 802         hid_hw_wait(hid);
 803         return 0;
 804 }
 805
 806 static ssize_t lg4ff_alternate_modes_show(struct device *dev, struct device_attribute *attr, char *buf)
 807 {
 808         struct hid_device *hid = to_hid_device(dev);
 809         struct lg4ff_device_entry *entry;
 810         struct lg_drv_data *drv_data;
 811         ssize_t count = 0;
 812         int i;
 813
 814         drv_data = hid_get_drvdata(hid);
 815         if (!drv_data) {
 816                 hid_err(hid, "Private driver data not found!\n");
 817                 return 0;
 818         }
 819
 820         entry = drv_data->device_props;
 821         if (!entry) {
 822                 hid_err(hid, "Device properties not found!\n");
 823                 return 0;
 824         }
 825
 826         if (!entry->wdata.real_name) {
 827                 hid_err(hid, "NULL pointer to string\n");
 828                 return 0;
 829         }
 830
 831         for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) {
 832                 if (entry->wdata.alternate_modes & BIT(i)) {
 833                         /* Print tag and full name */
 834                         count += scnprintf(buf + count, PAGE_SIZE - count, "%s: %s",
 835                                            lg4ff_alternate_modes[i].tag,
 836                                            !lg4ff_alternate_modes[i].product_id ? entry->wdata.real_name : lg4ff_alternate_modes[i].name);
 837                         if (count >= PAGE_SIZE - 1)
 838                                 return count;
 839
 840                         /* Mark the currently active mode with an asterisk */
 841                         if (lg4ff_alternate_modes[i].product_id == entry->wdata.product_id ||
 842                             (lg4ff_alternate_modes[i].product_id == 0 && entry->wdata.product_id == entry->wdata.real_product_id))
 843                                 count += scnprintf(buf + count, PAGE_SIZE - count, " *\n");
 844                         else
 845                                 count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
 846
 847                         if (count >= PAGE_SIZE - 1)
 848                                 return count;
 849                 }
 850         }
 851
 852         return count;
 853 }
 854
 855 static ssize_t lg4ff_alternate_modes_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 856 {
 857         struct hid_device *hid = to_hid_device(dev);
 858         struct lg4ff_device_entry *entry;
 859         struct lg_drv_data *drv_data;
 860         const struct lg4ff_compat_mode_switch *s;
 861         u16 target_product_id = 0;
 862         int i, ret;
 863         char *lbuf;
 864
 865         drv_data = hid_get_drvdata(hid);
 866         if (!drv_data) {
 867                 hid_err(hid, "Private driver data not found!\n");
 868                 return -EINVAL;
 869         }
 870
 871         entry = drv_data->device_props;
 872         if (!entry) {
 873                 hid_err(hid, "Device properties not found!\n");
 874                 return -EINVAL;
 875         }
 876
 877         /* Allow \n at the end of the input parameter */
 878         lbuf = kasprintf(GFP_KERNEL, "%s", buf);
 879         if (!lbuf)
 880                 return -ENOMEM;
 881
 882         i = strlen(lbuf);
 883         if (lbuf[i-1] == '\n') {
 884                 if (i == 1) {
 885                         kfree(lbuf);
 886                         return -EINVAL;
 887                 }
 888                 lbuf[i-1] = '\0';
 889         }
 890
 891         for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) {
 892                 const u16 mode_product_id = lg4ff_alternate_modes[i].product_id;
 893                 const char *tag = lg4ff_alternate_modes[i].tag;
 894
 895                 if (entry->wdata.alternate_modes & BIT(i)) {
 896                         if (!strcmp(tag, lbuf)) {
 897                                 if (!mode_product_id)
 898                                         target_product_id = entry->wdata.real_product_id;
 899                                 else
 900                                         target_product_id = mode_product_id;
 901                                 break;
 902                         }
 903                 }
 904         }
 905
 906         if (i == LG4FF_MODE_MAX_IDX) {
 907                 hid_info(hid, "Requested mode \"%s\" is not supported by the device\n", lbuf);
 908                 kfree(lbuf);
 909                 return -EINVAL;
 910         }
 911         kfree(lbuf); /* Not needed anymore */
 912
 913         if (target_product_id == entry->wdata.product_id) /* Nothing to do */
 914                 return count;
 915
 916         /* Automatic switching has to be disabled for the switch to DF-EX mode to work correctly */
 917         if (target_product_id == USB_DEVICE_ID_LOGITECH_WHEEL && !lg4ff_no_autoswitch) {
 918                 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",
 919                          entry->wdata.real_name);
 920                 return -EINVAL;
 921         }
 922
 923         /* Take care of hardware limitations */
 924         if ((entry->wdata.real_product_id == USB_DEVICE_ID_LOGITECH_DFP_WHEEL || entry->wdata.real_product_id == USB_DEVICE_ID_LOGITECH_G25_WHEEL) &&
 925             entry->wdata.product_id > target_product_id) {
 926                 hid_info(hid, "\"%s\" cannot be switched back into \"%s\" mode\n", entry->wdata.real_name, lg4ff_alternate_modes[i].name);
 927                 return -EINVAL;
 928         }
 929
 930         s = lg4ff_get_mode_switch_command(entry->wdata.real_product_id, target_product_id);
 931         if (!s) {
 932                 hid_err(hid, "Invalid target product ID %X\n", target_product_id);
 933                 return -EINVAL;
 934         }
 935
 936         ret = lg4ff_switch_compatibility_mode(hid, s);
 937         return (ret == 0 ? count : ret);
 938 }
 939 static DEVICE_ATTR(alternate_modes, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_alternate_modes_show, lg4ff_alternate_modes_store);
 940
 941 static ssize_t lg4ff_combine_show(struct device *dev, struct device_attribute *attr,
 942                                 char *buf)
 943 {
 944         struct hid_device *hid = to_hid_device(dev);
 945         struct lg4ff_device_entry *entry;
 946         struct lg_drv_data *drv_data;
 947         size_t count;
 948
 949         drv_data = hid_get_drvdata(hid);
 950         if (!drv_data) {
 951                 hid_err(hid, "Private driver data not found!\n");
 952                 return 0;
 953         }
 954
 955         entry = drv_data->device_props;
 956         if (!entry) {
 957                 hid_err(hid, "Device properties not found!\n");
 958                 return 0;
 959         }
 960
 961         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.combine);
 962         return count;
 963 }
 964
 965 static ssize_t lg4ff_combine_store(struct device *dev, struct device_attribute *attr,
 966                                  const char *buf, size_t count)
 967 {
 968         struct hid_device *hid = to_hid_device(dev);
 969         struct lg4ff_device_entry *entry;
 970         struct lg_drv_data *drv_data;
 971         u16 combine = simple_strtoul(buf, NULL, 10);
 972
 973         drv_data = hid_get_drvdata(hid);
 974         if (!drv_data) {
 975                 hid_err(hid, "Private driver data not found!\n");
 976                 return -EINVAL;
 977         }
 978
 979         entry = drv_data->device_props;
 980         if (!entry) {
 981                 hid_err(hid, "Device properties not found!\n");
 982                 return -EINVAL;
 983         }
 984
 985         if (combine > 1)
 986                 combine = 1;
 987
 988         entry->wdata.combine = combine;
 989         return count;
 990 }
 991 static DEVICE_ATTR(combine_pedals, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_combine_show, lg4ff_combine_store);
 992
 993 /* Export the currently set range of the wheel */
 994 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr,
 995                                 char *buf)
 996 {
 997         struct hid_device *hid = to_hid_device(dev);
 998         struct lg4ff_device_entry *entry;
 999         struct lg_drv_data *drv_data;
1000         size_t count;
1001
1002         drv_data = hid_get_drvdata(hid);
1003         if (!drv_data) {
1004                 hid_err(hid, "Private driver data not found!\n");
1005                 return 0;
1006         }
1007
1008         entry = drv_data->device_props;
1009         if (!entry) {
1010                 hid_err(hid, "Device properties not found!\n");
1011                 return 0;
1012         }
1013
1014         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.range);
1015         return count;
1016 }
1017
1018 /* Set range to user specified value, call appropriate function
1019  * according to the type of the wheel */
1020 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr,
1021                                  const char *buf, size_t count)
1022 {
1023         struct hid_device *hid = to_hid_device(dev);
1024         struct lg4ff_device_entry *entry;
1025         struct lg_drv_data *drv_data;
1026         u16 range = simple_strtoul(buf, NULL, 10);
1027
1028         drv_data = hid_get_drvdata(hid);
1029         if (!drv_data) {
1030                 hid_err(hid, "Private driver data not found!\n");
1031                 return -EINVAL;
1032         }
1033
1034         entry = drv_data->device_props;
1035         if (!entry) {
1036                 hid_err(hid, "Device properties not found!\n");
1037                 return -EINVAL;
1038         }
1039
1040         if (range == 0)
1041                 range = entry->wdata.max_range;
1042
1043         /* Check if the wheel supports range setting
1044          * and that the range is within limits for the wheel */
1045         if (entry->wdata.set_range && range >= entry->wdata.min_range && range <= entry->wdata.max_range) {
1046                 entry->wdata.set_range(hid, range);
1047                 entry->wdata.range = range;
1048         }
1049
1050         return count;
1051 }
1052 static DEVICE_ATTR(range, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH, lg4ff_range_show, lg4ff_range_store);
1053
1054 static ssize_t lg4ff_real_id_show(struct device *dev, struct device_attribute *attr, char *buf)
1055 {
1056         struct hid_device *hid = to_hid_device(dev);
1057         struct lg4ff_device_entry *entry;
1058         struct lg_drv_data *drv_data;
1059         size_t count;
1060
1061         drv_data = hid_get_drvdata(hid);
1062         if (!drv_data) {
1063                 hid_err(hid, "Private driver data not found!\n");
1064                 return 0;
1065         }
1066
1067         entry = drv_data->device_props;
1068         if (!entry) {
1069                 hid_err(hid, "Device properties not found!\n");
1070                 return 0;
1071         }
1072
1073         if (!entry->wdata.real_tag || !entry->wdata.real_name) {
1074                 hid_err(hid, "NULL pointer to string\n");
1075                 return 0;
1076         }
1077
1078         count = scnprintf(buf, PAGE_SIZE, "%s: %s\n", entry->wdata.real_tag, entry->wdata.real_name);
1079         return count;
1080 }
1081
1082 static ssize_t lg4ff_real_id_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1083 {
1084         /* Real ID is a read-only value */
1085         return -EPERM;
1086 }
1087 static DEVICE_ATTR(real_id, S_IRUGO, lg4ff_real_id_show, lg4ff_real_id_store);
1088
1089 #ifdef CONFIG_LEDS_CLASS
1090 static void lg4ff_set_leds(struct hid_device *hid, u8 leds)
1091 {
1092         struct lg_drv_data *drv_data;
1093         struct lg4ff_device_entry *entry;
1094         unsigned long flags;
1095         s32 *value;
1096
1097         drv_data = hid_get_drvdata(hid);
1098         if (!drv_data) {
1099                 hid_err(hid, "Private driver data not found!\n");
1100                 return;
1101         }
1102
1103         entry = drv_data->device_props;
1104         if (!entry) {
1105                 hid_err(hid, "Device properties not found!\n");
1106                 return;
1107         }
1108         value = entry->report->field[0]->value;
1109
1110         spin_lock_irqsave(&entry->report_lock, flags);
1111         value[0] = 0xf8;
1112         value[1] = 0x12;
1113         value[2] = leds;
1114         value[3] = 0x00;
1115         value[4] = 0x00;
1116         value[5] = 0x00;
1117         value[6] = 0x00;
1118         hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
1119         spin_unlock_irqrestore(&entry->report_lock, flags);
1120 }
1121
1122 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
1123                         enum led_brightness value)
1124 {
1125         struct device *dev = led_cdev->dev->parent;
1126         struct hid_device *hid = to_hid_device(dev);
1127         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
1128         struct lg4ff_device_entry *entry;
1129         int i, state = 0;
1130
1131         if (!drv_data) {
1132                 hid_err(hid, "Device data not found.");
1133                 return;
1134         }
1135
1136         entry = drv_data->device_props;
1137
1138         if (!entry) {
1139                 hid_err(hid, "Device properties not found.");
1140                 return;
1141         }
1142
1143         for (i = 0; i < 5; i++) {
1144                 if (led_cdev != entry->wdata.led[i])
1145                         continue;
1146                 state = (entry->wdata.led_state >> i) & 1;
1147                 if (value == LED_OFF && state) {
1148                         entry->wdata.led_state &= ~(1 << i);
1149                         lg4ff_set_leds(hid, entry->wdata.led_state);
1150                 } else if (value != LED_OFF && !state) {
1151                         entry->wdata.led_state |= 1 << i;
1152                         lg4ff_set_leds(hid, entry->wdata.led_state);
1153                 }
1154                 break;
1155         }
1156 }
1157
1158 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
1159 {
1160         struct device *dev = led_cdev->dev->parent;
1161         struct hid_device *hid = to_hid_device(dev);
1162         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
1163         struct lg4ff_device_entry *entry;
1164         int i, value = 0;
1165
1166         if (!drv_data) {
1167                 hid_err(hid, "Device data not found.");
1168                 return LED_OFF;
1169         }
1170
1171         entry = drv_data->device_props;
1172
1173         if (!entry) {
1174                 hid_err(hid, "Device properties not found.");
1175                 return LED_OFF;
1176         }
1177
1178         for (i = 0; i < 5; i++)
1179                 if (led_cdev == entry->wdata.led[i]) {
1180                         value = (entry->wdata.led_state >> i) & 1;
1181                         break;
1182                 }
1183
1184         return value ? LED_FULL : LED_OFF;
1185 }
1186 #endif
1187
1188 static u16 lg4ff_identify_multimode_wheel(struct hid_device *hid, const u16 reported_product_id, const u16 bcdDevice)
1189 {
1190         u32 current_mode;
1191         int i;
1192
1193         /* identify current mode from USB PID */
1194         for (i = 1; i < ARRAY_SIZE(lg4ff_alternate_modes); i++) {
1195                 dbg_hid("Testing whether PID is %X\n", lg4ff_alternate_modes[i].product_id);
1196                 if (reported_product_id == lg4ff_alternate_modes[i].product_id)
1197                         break;
1198         }
1199
1200         if (i == ARRAY_SIZE(lg4ff_alternate_modes))
1201                 return 0;
1202
1203         current_mode = BIT(i);
1204
1205         for (i = 0; i < ARRAY_SIZE(lg4ff_main_checklist); i++) {
1206                 const u16 mask = lg4ff_main_checklist[i]->mask;
1207                 const u16 result = lg4ff_main_checklist[i]->result;
1208                 const u16 real_product_id = lg4ff_main_checklist[i]->real_product_id;
1209
1210                 if ((current_mode & lg4ff_main_checklist[i]->modes) && \
1211                                 (bcdDevice & mask) == result) {
1212                         dbg_hid("Found wheel with real PID %X whose reported PID is %X\n", real_product_id, reported_product_id);
1213                         return real_product_id;
1214                 }
1215         }
1216
1217         /* No match found. This is either Driving Force or an unknown
1218          * wheel model, do not touch it */
1219         dbg_hid("Wheel with bcdDevice %X was not recognized as multimode wheel, leaving in its current mode\n", bcdDevice);
1220         return 0;
1221 }
1222
1223 static int lg4ff_handle_multimode_wheel(struct hid_device *hid, u16 *real_product_id, const u16 bcdDevice)
1224 {
1225         const u16 reported_product_id = hid->product;
1226         int ret;
1227
1228         *real_product_id = lg4ff_identify_multimode_wheel(hid, reported_product_id, bcdDevice);
1229         /* Probed wheel is not a multimode wheel */
1230         if (!*real_product_id) {
1231                 *real_product_id = reported_product_id;
1232                 dbg_hid("Wheel is not a multimode wheel\n");
1233                 return LG4FF_MMODE_NOT_MULTIMODE;
1234         }
1235
1236         /* Switch from "Driving Force" mode to native mode automatically.
1237          * Otherwise keep the wheel in its current mode */
1238         if (reported_product_id == USB_DEVICE_ID_LOGITECH_WHEEL &&
1239             reported_product_id != *real_product_id &&
1240             !lg4ff_no_autoswitch) {
1241                 const struct lg4ff_compat_mode_switch *s = lg4ff_get_mode_switch_command(*real_product_id, *real_product_id);
1242
1243                 if (!s) {
1244                         hid_err(hid, "Invalid product id %X\n", *real_product_id);
1245                         return LG4FF_MMODE_NOT_MULTIMODE;
1246                 }
1247
1248                 ret = lg4ff_switch_compatibility_mode(hid, s);
1249                 if (ret) {
1250                         /* Wheel could not have been switched to native mode,
1251                          * leave it in "Driving Force" mode and continue */
1252                         hid_err(hid, "Unable to switch wheel mode, errno %d\n", ret);
1253                         return LG4FF_MMODE_IS_MULTIMODE;
1254                 }
1255                 return LG4FF_MMODE_SWITCHED;
1256         }
1257
1258         return LG4FF_MMODE_IS_MULTIMODE;
1259 }
1260
1261
1262 int lg4ff_init(struct hid_device *hid)
1263 {
1264         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
1265         struct input_dev *dev = hidinput->input;
1266         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
1267         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
1268         const struct usb_device_descriptor *udesc = &(hid_to_usb_dev(hid)->descriptor);
1269         const u16 bcdDevice = le16_to_cpu(udesc->bcdDevice);
1270         const struct lg4ff_multimode_wheel *mmode_wheel = NULL;
1271         struct lg4ff_device_entry *entry;
1272         struct lg_drv_data *drv_data;
1273         int error, i, j;
1274         int mmode_ret, mmode_idx = -1;
1275         u16 real_product_id;
1276
1277         /* Check that the report looks ok */
1278         if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
1279                 return -1;
1280
1281         drv_data = hid_get_drvdata(hid);
1282         if (!drv_data) {
1283                 hid_err(hid, "Cannot add device, private driver data not allocated\n");
1284                 return -1;
1285         }
1286         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1287         if (!entry)
1288                 return -ENOMEM;
1289         spin_lock_init(&entry->report_lock);
1290         entry->report = report;
1291         drv_data->device_props = entry;
1292
1293         /* Check if a multimode wheel has been connected and
1294          * handle it appropriately */
1295         mmode_ret = lg4ff_handle_multimode_wheel(hid, &real_product_id, bcdDevice);
1296
1297         /* Wheel has been told to switch to native mode. There is no point in going on
1298          * with the initialization as the wheel will do a USB reset when it switches mode
1299          */
1300         if (mmode_ret == LG4FF_MMODE_SWITCHED)
1301                 return 0;
1302         else if (mmode_ret < 0) {
1303                 hid_err(hid, "Unable to switch device mode during initialization, errno %d\n", mmode_ret);
1304                 error = mmode_ret;
1305                 goto err_init;
1306         }
1307
1308         /* Check what wheel has been connected */
1309         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
1310                 if (hid->product == lg4ff_devices[i].product_id) {
1311                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
1312                         break;
1313                 }
1314         }
1315
1316         if (i == ARRAY_SIZE(lg4ff_devices)) {
1317                 hid_err(hid, "This device is flagged to be handled by the lg4ff module but this module does not know how to handle it. "
1318                              "Please report this as a bug to LKML, Simon Wood <simon@mungewell.org> or "
1319                              "Michal Maly <madcatxster@devoid-pointer.net>\n");
1320                 error = -1;
1321                 goto err_init;
1322         }
1323
1324         if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
1325                 for (mmode_idx = 0; mmode_idx < ARRAY_SIZE(lg4ff_multimode_wheels); mmode_idx++) {
1326                         if (real_product_id == lg4ff_multimode_wheels[mmode_idx].product_id)
1327                                 break;
1328                 }
1329
1330                 if (mmode_idx == ARRAY_SIZE(lg4ff_multimode_wheels)) {
1331                         hid_err(hid, "Device product ID %X is not listed as a multimode wheel", real_product_id);
1332                         error = -1;
1333                         goto err_init;
1334                 }
1335         }
1336
1337         /* Set supported force feedback capabilities */
1338         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
1339                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
1340
1341         error = input_ff_create_memless(dev, NULL, lg4ff_play);
1342
1343         if (error)
1344                 goto err_init;
1345
1346         /* Initialize device properties */
1347         if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
1348                 BUG_ON(mmode_idx == -1);
1349                 mmode_wheel = &lg4ff_multimode_wheels[mmode_idx];
1350         }
1351         lg4ff_init_wheel_data(&entry->wdata, &lg4ff_devices[i], mmode_wheel, real_product_id);
1352
1353         /* Check if autocentering is available and
1354          * set the centering force to zero by default */
1355         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
1356                 /* Formula Force EX expects different autocentering command */
1357                 if ((bcdDevice >> 8) == LG4FF_FFEX_REV_MAJ &&
1358                     (bcdDevice & 0xff) == LG4FF_FFEX_REV_MIN)
1359                         dev->ff->set_autocenter = lg4ff_set_autocenter_ffex;
1360                 else
1361                         dev->ff->set_autocenter = lg4ff_set_autocenter_default;
1362
1363                 dev->ff->set_autocenter(dev, 0);
1364         }
1365
1366         /* Create sysfs interface */
1367         error = device_create_file(&hid->dev, &dev_attr_combine_pedals);
1368         if (error)
1369                 hid_warn(hid, "Unable to create sysfs interface for \"combine\", errno %d\n", error);
1370         error = device_create_file(&hid->dev, &dev_attr_range);
1371         if (error)
1372                 hid_warn(hid, "Unable to create sysfs interface for \"range\", errno %d\n", error);
1373         if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
1374                 error = device_create_file(&hid->dev, &dev_attr_real_id);
1375                 if (error)
1376                         hid_warn(hid, "Unable to create sysfs interface for \"real_id\", errno %d\n", error);
1377                 error = device_create_file(&hid->dev, &dev_attr_alternate_modes);
1378                 if (error)
1379                         hid_warn(hid, "Unable to create sysfs interface for \"alternate_modes\", errno %d\n", error);
1380         }
1381         dbg_hid("sysfs interface created\n");
1382
1383         /* Set the maximum range to start with */
1384         entry->wdata.range = entry->wdata.max_range;
1385         if (entry->wdata.set_range)
1386                 entry->wdata.set_range(hid, entry->wdata.range);
1387
1388 #ifdef CONFIG_LEDS_CLASS
1389         /* register led subsystem - G27/G29 only */
1390         entry->wdata.led_state = 0;
1391         for (j = 0; j < 5; j++)
1392                 entry->wdata.led[j] = NULL;
1393
1394         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL ||
1395                         lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G29_WHEEL) {
1396                 struct led_classdev *led;
1397                 size_t name_sz;
1398                 char *name;
1399
1400                 lg4ff_set_leds(hid, 0);
1401
1402                 name_sz = strlen(dev_name(&hid->dev)) + 8;
1403
1404                 for (j = 0; j < 5; j++) {
1405                         led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
1406                         if (!led) {
1407                                 hid_err(hid, "can't allocate memory for LED %d\n", j);
1408                                 goto err_leds;
1409                         }
1410
1411                         name = (void *)(&led[1]);
1412                         snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
1413                         led->name = name;
1414                         led->brightness = 0;
1415                         led->max_brightness = 1;
1416                         led->brightness_get = lg4ff_led_get_brightness;
1417                         led->brightness_set = lg4ff_led_set_brightness;
1418
1419                         entry->wdata.led[j] = led;
1420                         error = led_classdev_register(&hid->dev, led);
1421
1422                         if (error) {
1423                                 hid_err(hid, "failed to register LED %d. Aborting.\n", j);
1424 err_leds:
1425                                 /* Deregister LEDs (if any) */
1426                                 for (j = 0; j < 5; j++) {
1427                                         led = entry->wdata.led[j];
1428                                         entry->wdata.led[j] = NULL;
1429                                         if (!led)
1430                                                 continue;
1431                                         led_classdev_unregister(led);
1432                                         kfree(led);
1433                                 }
1434                                 goto out;       /* Let the driver continue without LEDs */
1435                         }
1436                 }
1437         }
1438 out:
1439 #endif
1440         hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
1441         return 0;
1442
1443 err_init:
1444         drv_data->device_props = NULL;
1445         kfree(entry);
1446         return error;
1447 }
1448
1449 int lg4ff_deinit(struct hid_device *hid)
1450 {
1451         struct lg4ff_device_entry *entry;
1452         struct lg_drv_data *drv_data;
1453
1454         drv_data = hid_get_drvdata(hid);
1455         if (!drv_data) {
1456                 hid_err(hid, "Error while deinitializing device, no private driver data.\n");
1457                 return -1;
1458         }
1459         entry = drv_data->device_props;
1460         if (!entry)
1461                 goto out; /* Nothing more to do */
1462
1463         /* Multimode devices will have at least the "MODE_NATIVE" bit set */
1464         if (entry->wdata.alternate_modes) {
1465                 device_remove_file(&hid->dev, &dev_attr_real_id);
1466                 device_remove_file(&hid->dev, &dev_attr_alternate_modes);
1467         }
1468
1469         device_remove_file(&hid->dev, &dev_attr_combine_pedals);
1470         device_remove_file(&hid->dev, &dev_attr_range);
1471 #ifdef CONFIG_LEDS_CLASS
1472         {
1473                 int j;
1474                 struct led_classdev *led;
1475
1476                 /* Deregister LEDs (if any) */
1477                 for (j = 0; j < 5; j++) {
1478
1479                         led = entry->wdata.led[j];
1480                         entry->wdata.led[j] = NULL;
1481                         if (!led)
1482                                 continue;
1483                         led_classdev_unregister(led);
1484                         kfree(led);
1485                 }
1486         }
1487 #endif
1488         hid_hw_stop(hid);
1489         drv_data->device_props = NULL;
1490
1491         kfree(entry);
1492 out:
1493         dbg_hid("Device successfully unregistered\n");
1494         return 0;
1495 }