drivers/hid/hid-lg4ff.c

   1 /*
   2  *  Force feedback support for Logitech Gaming Wheels
   3  *
   4  *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
   5  *  Speed Force Wireless (WiiWheel)
   6  *
   7  *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
   8  */
   9
  10 /*
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26
  27 #include <linux/input.h>
  28 #include <linux/usb.h>
  29 #include <linux/hid.h>
  30
  31 #include "usbhid/usbhid.h"
  32 #include "hid-lg.h"
  33 #include "hid-ids.h"
  34
  35 #define DFGT_REV_MAJ 0x13
  36 #define DFGT_REV_MIN 0x22
  37 #define DFGT2_REV_MIN 0x26
  38 #define DFP_REV_MAJ 0x11
  39 #define DFP_REV_MIN 0x06
  40 #define FFEX_REV_MAJ 0x21
  41 #define FFEX_REV_MIN 0x00
  42 #define G25_REV_MAJ 0x12
  43 #define G25_REV_MIN 0x22
  44 #define G27_REV_MAJ 0x12
  45 #define G27_REV_MIN 0x38
  46 #define G27_2_REV_MIN 0x39
  47
  48 #define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
  49
  50 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
  51 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
  52 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
  53 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
  54
  55 static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IROTH, lg4ff_range_show, lg4ff_range_store);
  56
  57 struct lg4ff_device_entry {
  58         __u32 product_id;
  59         __u16 range;
  60         __u16 min_range;
  61         __u16 max_range;
  62 #ifdef CONFIG_LEDS_CLASS
  63         __u8  led_state;
  64         struct led_classdev *led[5];
  65 #endif
  66         struct list_head list;
  67         void (*set_range)(struct hid_device *hid, u16 range);
  68 };
  69
  70 static const signed short lg4ff_wheel_effects[] = {
  71         FF_CONSTANT,
  72         FF_AUTOCENTER,
  73         -1
  74 };
  75
  76 struct lg4ff_wheel {
  77         const __u32 product_id;
  78         const signed short *ff_effects;
  79         const __u16 min_range;
  80         const __u16 max_range;
  81         void (*set_range)(struct hid_device *hid, u16 range);
  82 };
  83
  84 static const struct lg4ff_wheel lg4ff_devices[] = {
  85         {USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
  86         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
  87         {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
  88         {USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  89         {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  90         {USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  91         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
  92         {USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
  93 };
  94
  95 struct lg4ff_native_cmd {
  96         const __u8 cmd_num;     /* Number of commands to send */
  97         const __u8 cmd[];
  98 };
  99
 100 struct lg4ff_usb_revision {
 101         const __u16 rev_maj;
 102         const __u16 rev_min;
 103         const struct lg4ff_native_cmd *command;
 104 };
 105
 106 static const struct lg4ff_native_cmd native_dfp = {
 107         1,
 108         {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
 109 };
 110
 111 static const struct lg4ff_native_cmd native_dfgt = {
 112         2,
 113         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 114          0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 115 };
 116
 117 static const struct lg4ff_native_cmd native_g25 = {
 118         1,
 119         {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
 120 };
 121
 122 static const struct lg4ff_native_cmd native_g27 = {
 123         2,
 124         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 125          0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 126 };
 127
 128 static const struct lg4ff_usb_revision lg4ff_revs[] = {
 129         {DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt},     /* Driving Force GT */
 130         {DFGT_REV_MAJ, DFGT2_REV_MIN, &native_dfgt},    /* Driving Force GT v2 */
 131         {DFP_REV_MAJ,  DFP_REV_MIN,  &native_dfp},      /* Driving Force Pro */
 132         {G25_REV_MAJ,  G25_REV_MIN,  &native_g25},      /* G25 */
 133         {G27_REV_MAJ,  G27_REV_MIN,  &native_g27},      /* G27 */
 134         {G27_REV_MAJ,  G27_2_REV_MIN,  &native_g27},    /* G27 v2 */
 135 };
 136
 137 /* Recalculates X axis value accordingly to currently selected range */
 138 static __s32 lg4ff_adjust_dfp_x_axis(__s32 value, __u16 range)
 139 {
 140         __u16 max_range;
 141         __s32 new_value;
 142
 143         if (range == 900)
 144                 return value;
 145         else if (range == 200)
 146                 return value;
 147         else if (range < 200)
 148                 max_range = 200;
 149         else
 150                 max_range = 900;
 151
 152         new_value = 8192 + mult_frac(value - 8192, max_range, range);
 153         if (new_value < 0)
 154                 return 0;
 155         else if (new_value > 16383)
 156                 return 16383;
 157         else
 158                 return new_value;
 159 }
 160
 161 int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
 162                              struct hid_usage *usage, __s32 value, struct lg_drv_data *drv_data)
 163 {
 164         struct lg4ff_device_entry *entry = drv_data->device_props;
 165         __s32 new_value = 0;
 166
 167         if (!entry) {
 168                 hid_err(hid, "Device properties not found");
 169                 return 0;
 170         }
 171
 172         switch (entry->product_id) {
 173         case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 174                 switch (usage->code) {
 175                 case ABS_X:
 176                         new_value = lg4ff_adjust_dfp_x_axis(value, entry->range);
 177                         input_event(field->hidinput->input, usage->type, usage->code, new_value);
 178                         return 1;
 179                 default:
 180                         return 0;
 181                 }
 182         default:
 183                 return 0;
 184         }
 185 }
 186
 187 static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
 188 {
 189         struct hid_device *hid = input_get_drvdata(dev);
 190         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 191         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 192         __s32 *value = report->field[0]->value;
 193         int x;
 194
 195 #define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)
 196
 197         switch (effect->type) {
 198         case FF_CONSTANT:
 199                 x = effect->u.ramp.start_level + 0x80;  /* 0x80 is no force */
 200                 CLAMP(x);
 201
 202                 if (x == 0x80) {
 203                         /* De-activate force in slot-1*/
 204                         value[0] = 0x13;
 205                         value[1] = 0x00;
 206                         value[2] = 0x00;
 207                         value[3] = 0x00;
 208                         value[4] = 0x00;
 209                         value[5] = 0x00;
 210                         value[6] = 0x00;
 211
 212                         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 213                         return 0;
 214                 }
 215
 216                 value[0] = 0x11;        /* Slot 1 */
 217                 value[1] = 0x08;
 218                 value[2] = x;
 219                 value[3] = 0x80;
 220                 value[4] = 0x00;
 221                 value[5] = 0x00;
 222                 value[6] = 0x00;
 223
 224                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 225                 break;
 226         }
 227         return 0;
 228 }
 229
 230 /* Sends default autocentering command compatible with
 231  * all wheels except Formula Force EX */
 232 static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 233 {
 234         struct hid_device *hid = input_get_drvdata(dev);
 235         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 236         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 237         __s32 *value = report->field[0]->value;
 238         __u32 expand_a, expand_b;
 239         struct lg4ff_device_entry *entry;
 240         struct lg_drv_data *drv_data;
 241
 242         drv_data = hid_get_drvdata(hid);
 243         if (!drv_data) {
 244                 hid_err(hid, "Private driver data not found!\n");
 245                 return;
 246         }
 247
 248         entry = drv_data->device_props;
 249         if (!entry) {
 250                 hid_err(hid, "Device properties not found!\n");
 251                 return;
 252         }
 253
 254         /* De-activate Auto-Center */
 255         if (magnitude == 0) {
 256                 value[0] = 0xf5;
 257                 value[1] = 0x00;
 258                 value[2] = 0x00;
 259                 value[3] = 0x00;
 260                 value[4] = 0x00;
 261                 value[5] = 0x00;
 262                 value[6] = 0x00;
 263
 264                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 265                 return;
 266         }
 267
 268         if (magnitude <= 0xaaaa) {
 269                 expand_a = 0x0c * magnitude;
 270                 expand_b = 0x80 * magnitude;
 271         } else {
 272                 expand_a = (0x0c * 0xaaaa) + 0x06 * (magnitude - 0xaaaa);
 273                 expand_b = (0x80 * 0xaaaa) + 0xff * (magnitude - 0xaaaa);
 274         }
 275
 276         /* Adjust for non-MOMO wheels */
 277         switch (entry->product_id) {
 278         case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
 279         case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
 280                 break;
 281         default:
 282                 expand_a = expand_a >> 1;
 283                 break;
 284         }
 285
 286         value[0] = 0xfe;
 287         value[1] = 0x0d;
 288         value[2] = expand_a / 0xaaaa;
 289         value[3] = expand_a / 0xaaaa;
 290         value[4] = expand_b / 0xaaaa;
 291         value[5] = 0x00;
 292         value[6] = 0x00;
 293
 294         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 295
 296         /* Activate Auto-Center */
 297         value[0] = 0x14;
 298         value[1] = 0x00;
 299         value[2] = 0x00;
 300         value[3] = 0x00;
 301         value[4] = 0x00;
 302         value[5] = 0x00;
 303         value[6] = 0x00;
 304
 305         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 306 }
 307
 308 /* Sends autocentering command compatible with Formula Force EX */
 309 static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 310 {
 311         struct hid_device *hid = input_get_drvdata(dev);
 312         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 313         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 314         __s32 *value = report->field[0]->value;
 315         magnitude = magnitude * 90 / 65535;
 316
 317         value[0] = 0xfe;
 318         value[1] = 0x03;
 319         value[2] = magnitude >> 14;
 320         value[3] = magnitude >> 14;
 321         value[4] = magnitude;
 322         value[5] = 0x00;
 323         value[6] = 0x00;
 324
 325         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 326 }
 327
 328 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 329 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 330 {
 331         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 332         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 333         __s32 *value = report->field[0]->value;
 334
 335         dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 336
 337         value[0] = 0xf8;
 338         value[1] = 0x81;
 339         value[2] = range & 0x00ff;
 340         value[3] = (range & 0xff00) >> 8;
 341         value[4] = 0x00;
 342         value[5] = 0x00;
 343         value[6] = 0x00;
 344
 345         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 346 }
 347
 348 /* Sends commands to set range compatible with Driving Force Pro wheel */
 349 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
 350 {
 351         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 352         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 353         int start_left, start_right, full_range;
 354         __s32 *value = report->field[0]->value;
 355
 356         dbg_hid("Driving Force Pro: setting range to %u\n", range);
 357
 358         /* Prepare "coarse" limit command */
 359         value[0] = 0xf8;
 360         value[1] = 0x00;        /* Set later */
 361         value[2] = 0x00;
 362         value[3] = 0x00;
 363         value[4] = 0x00;
 364         value[5] = 0x00;
 365         value[6] = 0x00;
 366
 367         if (range > 200) {
 368                 report->field[0]->value[1] = 0x03;
 369                 full_range = 900;
 370         } else {
 371                 report->field[0]->value[1] = 0x02;
 372                 full_range = 200;
 373         }
 374         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 375
 376         /* Prepare "fine" limit command */
 377         value[0] = 0x81;
 378         value[1] = 0x0b;
 379         value[2] = 0x00;
 380         value[3] = 0x00;
 381         value[4] = 0x00;
 382         value[5] = 0x00;
 383         value[6] = 0x00;
 384
 385         if (range == 200 || range == 900) {     /* Do not apply any fine limit */
 386                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 387                 return;
 388         }
 389
 390         /* Construct fine limit command */
 391         start_left = (((full_range - range + 1) * 2047) / full_range);
 392         start_right = 0xfff - start_left;
 393
 394         value[2] = start_left >> 4;
 395         value[3] = start_right >> 4;
 396         value[4] = 0xff;
 397         value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 398         value[6] = 0xff;
 399
 400         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 401 }
 402
 403 static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
 404 {
 405         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 406         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 407         __u8 i, j;
 408
 409         j = 0;
 410         while (j < 7*cmd->cmd_num) {
 411                 for (i = 0; i < 7; i++)
 412                         report->field[0]->value[i] = cmd->cmd[j++];
 413
 414                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 415         }
 416 }
 417
 418 /* Read current range and display it in terminal */
 419 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
 420 {
 421         struct hid_device *hid = to_hid_device(dev);
 422         struct lg4ff_device_entry *entry;
 423         struct lg_drv_data *drv_data;
 424         size_t count;
 425
 426         drv_data = hid_get_drvdata(hid);
 427         if (!drv_data) {
 428                 hid_err(hid, "Private driver data not found!\n");
 429                 return 0;
 430         }
 431
 432         entry = drv_data->device_props;
 433         if (!entry) {
 434                 hid_err(hid, "Device properties not found!\n");
 435                 return 0;
 436         }
 437
 438         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
 439         return count;
 440 }
 441
 442 /* Set range to user specified value, call appropriate function
 443  * according to the type of the wheel */
 444 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 445 {
 446         struct hid_device *hid = to_hid_device(dev);
 447         struct lg4ff_device_entry *entry;
 448         struct lg_drv_data *drv_data;
 449         __u16 range = simple_strtoul(buf, NULL, 10);
 450
 451         drv_data = hid_get_drvdata(hid);
 452         if (!drv_data) {
 453                 hid_err(hid, "Private driver data not found!\n");
 454                 return -EINVAL;
 455         }
 456
 457         entry = drv_data->device_props;
 458         if (!entry) {
 459                 hid_err(hid, "Device properties not found!\n");
 460                 return -EINVAL;
 461         }
 462
 463         if (range == 0)
 464                 range = entry->max_range;
 465
 466         /* Check if the wheel supports range setting
 467          * and that the range is within limits for the wheel */
 468         if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
 469                 entry->set_range(hid, range);
 470                 entry->range = range;
 471         }
 472
 473         return count;
 474 }
 475
 476 #ifdef CONFIG_LEDS_CLASS
 477 static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
 478 {
 479         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 480         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 481         __s32 *value = report->field[0]->value;
 482
 483         value[0] = 0xf8;
 484         value[1] = 0x12;
 485         value[2] = leds;
 486         value[3] = 0x00;
 487         value[4] = 0x00;
 488         value[5] = 0x00;
 489         value[6] = 0x00;
 490         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 491 }
 492
 493 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
 494                         enum led_brightness value)
 495 {
 496         struct device *dev = led_cdev->dev->parent;
 497         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 498         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 499         struct lg4ff_device_entry *entry;
 500         int i, state = 0;
 501
 502         if (!drv_data) {
 503                 hid_err(hid, "Device data not found.");
 504                 return;
 505         }
 506
 507         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 508
 509         if (!entry) {
 510                 hid_err(hid, "Device properties not found.");
 511                 return;
 512         }
 513
 514         for (i = 0; i < 5; i++) {
 515                 if (led_cdev != entry->led[i])
 516                         continue;
 517                 state = (entry->led_state >> i) & 1;
 518                 if (value == LED_OFF && state) {
 519                         entry->led_state &= ~(1 << i);
 520                         lg4ff_set_leds(hid, entry->led_state);
 521                 } else if (value != LED_OFF && !state) {
 522                         entry->led_state |= 1 << i;
 523                         lg4ff_set_leds(hid, entry->led_state);
 524                 }
 525                 break;
 526         }
 527 }
 528
 529 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
 530 {
 531         struct device *dev = led_cdev->dev->parent;
 532         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 533         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 534         struct lg4ff_device_entry *entry;
 535         int i, value = 0;
 536
 537         if (!drv_data) {
 538                 hid_err(hid, "Device data not found.");
 539                 return LED_OFF;
 540         }
 541
 542         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 543
 544         if (!entry) {
 545                 hid_err(hid, "Device properties not found.");
 546                 return LED_OFF;
 547         }
 548
 549         for (i = 0; i < 5; i++)
 550                 if (led_cdev == entry->led[i]) {
 551                         value = (entry->led_state >> i) & 1;
 552                         break;
 553                 }
 554
 555         return value ? LED_FULL : LED_OFF;
 556 }
 557 #endif
 558
 559 int lg4ff_init(struct hid_device *hid)
 560 {
 561         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 562         struct input_dev *dev = hidinput->input;
 563         struct lg4ff_device_entry *entry;
 564         struct lg_drv_data *drv_data;
 565         struct usb_device_descriptor *udesc;
 566         int error, i, j;
 567         __u16 bcdDevice, rev_maj, rev_min;
 568
 569         /* Check that the report looks ok */
 570         if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
 571                 return -1;
 572
 573         /* Check what wheel has been connected */
 574         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
 575                 if (hid->product == lg4ff_devices[i].product_id) {
 576                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
 577                         break;
 578                 }
 579         }
 580
 581         if (i == ARRAY_SIZE(lg4ff_devices)) {
 582                 hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
 583                              "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
 584                 return -1;
 585         }
 586
 587         /* Attempt to switch wheel to native mode when applicable */
 588         udesc = &(hid_to_usb_dev(hid)->descriptor);
 589         if (!udesc) {
 590                 hid_err(hid, "NULL USB device descriptor\n");
 591                 return -1;
 592         }
 593         bcdDevice = le16_to_cpu(udesc->bcdDevice);
 594         rev_maj = bcdDevice >> 8;
 595         rev_min = bcdDevice & 0xff;
 596
 597         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
 598                 dbg_hid("Generic wheel detected, can it do native?\n");
 599                 dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);
 600
 601                 for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
 602                         if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
 603                                 hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
 604                                 hid_info(hid, "Switched to native mode\n");
 605                         }
 606                 }
 607         }
 608
 609         /* Set supported force feedback capabilities */
 610         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
 611                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
 612
 613         error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
 614
 615         if (error)
 616                 return error;
 617
 618         /* Get private driver data */
 619         drv_data = hid_get_drvdata(hid);
 620         if (!drv_data) {
 621                 hid_err(hid, "Cannot add device, private driver data not allocated\n");
 622                 return -1;
 623         }
 624
 625         /* Initialize device properties */
 626         entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
 627         if (!entry) {
 628                 hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
 629                 return -ENOMEM;
 630         }
 631         drv_data->device_props = entry;
 632
 633         entry->product_id = lg4ff_devices[i].product_id;
 634         entry->min_range = lg4ff_devices[i].min_range;
 635         entry->max_range = lg4ff_devices[i].max_range;
 636         entry->set_range = lg4ff_devices[i].set_range;
 637
 638         /* Check if autocentering is available and
 639          * set the centering force to zero by default */
 640         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
 641                 if (rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN) /* Formula Force EX expects different autocentering command */
 642                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
 643                 else
 644                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;
 645
 646                 dev->ff->set_autocenter(dev, 0);
 647         }
 648
 649         /* Create sysfs interface */
 650         error = device_create_file(&hid->dev, &dev_attr_range);
 651         if (error)
 652                 return error;
 653         dbg_hid("sysfs interface created\n");
 654
 655         /* Set the maximum range to start with */
 656         entry->range = entry->max_range;
 657         if (entry->set_range != NULL)
 658                 entry->set_range(hid, entry->range);
 659
 660 #ifdef CONFIG_LEDS_CLASS
 661         /* register led subsystem - G27 only */
 662         entry->led_state = 0;
 663         for (j = 0; j < 5; j++)
 664                 entry->led[j] = NULL;
 665
 666         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
 667                 struct led_classdev *led;
 668                 size_t name_sz;
 669                 char *name;
 670
 671                 lg4ff_set_leds(hid, 0);
 672
 673                 name_sz = strlen(dev_name(&hid->dev)) + 8;
 674
 675                 for (j = 0; j < 5; j++) {
 676                         led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
 677                         if (!led) {
 678                                 hid_err(hid, "can't allocate memory for LED %d\n", j);
 679                                 goto err;
 680                         }
 681
 682                         name = (void *)(&led[1]);
 683                         snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
 684                         led->name = name;
 685                         led->brightness = 0;
 686                         led->max_brightness = 1;
 687                         led->brightness_get = lg4ff_led_get_brightness;
 688                         led->brightness_set = lg4ff_led_set_brightness;
 689
 690                         entry->led[j] = led;
 691                         error = led_classdev_register(&hid->dev, led);
 692
 693                         if (error) {
 694                                 hid_err(hid, "failed to register LED %d. Aborting.\n", j);
 695 err:
 696                                 /* Deregister LEDs (if any) */
 697                                 for (j = 0; j < 5; j++) {
 698                                         led = entry->led[j];
 699                                         entry->led[j] = NULL;
 700                                         if (!led)
 701                                                 continue;
 702                                         led_classdev_unregister(led);
 703                                         kfree(led);
 704                                 }
 705                                 goto out;       /* Let the driver continue without LEDs */
 706                         }
 707                 }
 708         }
 709 out:
 710 #endif
 711         hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
 712         return 0;
 713 }
 714
 715
 716
 717 int lg4ff_deinit(struct hid_device *hid)
 718 {
 719         struct lg4ff_device_entry *entry;
 720         struct lg_drv_data *drv_data;
 721
 722         device_remove_file(&hid->dev, &dev_attr_range);
 723
 724         drv_data = hid_get_drvdata(hid);
 725         if (!drv_data) {
 726                 hid_err(hid, "Error while deinitializing device, no private driver data.\n");
 727                 return -1;
 728         }
 729         entry = drv_data->device_props;
 730         if (!entry) {
 731                 hid_err(hid, "Error while deinitializing device, no device properties data.\n");
 732                 return -1;
 733         }
 734
 735 #ifdef CONFIG_LEDS_CLASS
 736         {
 737                 int j;
 738                 struct led_classdev *led;
 739
 740                 /* Deregister LEDs (if any) */
 741                 for (j = 0; j < 5; j++) {
 742
 743                         led = entry->led[j];
 744                         entry->led[j] = NULL;
 745                         if (!led)
 746                                 continue;
 747                         led_classdev_unregister(led);
 748                         kfree(led);
 749                 }
 750         }
 751 #endif
 752
 753         /* Deallocate memory */
 754         kfree(entry);
 755
 756         dbg_hid("Device successfully unregistered\n");
 757         return 0;
 758 }