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