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