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                 value[0] = 0x11;        /* Slot 1 */
 200                 value[1] = 0x08;
 201                 value[2] = x;
 202                 value[3] = 0x80;
 203                 value[4] = 0x00;
 204                 value[5] = 0x00;
 205                 value[6] = 0x00;
 206
 207                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 208                 break;
 209         }
 210         return 0;
 211 }
 212
 213 /* Sends default autocentering command compatible with
 214  * all wheels except Formula Force EX */
 215 static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 216 {
 217         struct hid_device *hid = input_get_drvdata(dev);
 218         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 219         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 220         __s32 *value = report->field[0]->value;
 221
 222         value[0] = 0xfe;
 223         value[1] = 0x0d;
 224         value[2] = magnitude >> 13;
 225         value[3] = magnitude >> 13;
 226         value[4] = magnitude >> 8;
 227         value[5] = 0x00;
 228         value[6] = 0x00;
 229
 230         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 231 }
 232
 233 /* Sends autocentering command compatible with Formula Force EX */
 234 static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 235 {
 236         struct hid_device *hid = input_get_drvdata(dev);
 237         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 238         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 239         __s32 *value = report->field[0]->value;
 240         magnitude = magnitude * 90 / 65535;
 241
 242         value[0] = 0xfe;
 243         value[1] = 0x03;
 244         value[2] = magnitude >> 14;
 245         value[3] = magnitude >> 14;
 246         value[4] = magnitude;
 247         value[5] = 0x00;
 248         value[6] = 0x00;
 249
 250         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 251 }
 252
 253 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 254 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 255 {
 256         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 257         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 258         __s32 *value = report->field[0]->value;
 259
 260         dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 261
 262         value[0] = 0xf8;
 263         value[1] = 0x81;
 264         value[2] = range & 0x00ff;
 265         value[3] = (range & 0xff00) >> 8;
 266         value[4] = 0x00;
 267         value[5] = 0x00;
 268         value[6] = 0x00;
 269
 270         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 271 }
 272
 273 /* Sends commands to set range compatible with Driving Force Pro wheel */
 274 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
 275 {
 276         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 277         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 278         int start_left, start_right, full_range;
 279         __s32 *value = report->field[0]->value;
 280
 281         dbg_hid("Driving Force Pro: setting range to %u\n", range);
 282
 283         /* Prepare "coarse" limit command */
 284         value[0] = 0xf8;
 285         value[1] = 0x00;        /* Set later */
 286         value[2] = 0x00;
 287         value[3] = 0x00;
 288         value[4] = 0x00;
 289         value[5] = 0x00;
 290         value[6] = 0x00;
 291
 292         if (range > 200) {
 293                 report->field[0]->value[1] = 0x03;
 294                 full_range = 900;
 295         } else {
 296                 report->field[0]->value[1] = 0x02;
 297                 full_range = 200;
 298         }
 299         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 300
 301         /* Prepare "fine" limit command */
 302         value[0] = 0x81;
 303         value[1] = 0x0b;
 304         value[2] = 0x00;
 305         value[3] = 0x00;
 306         value[4] = 0x00;
 307         value[5] = 0x00;
 308         value[6] = 0x00;
 309
 310         if (range == 200 || range == 900) {     /* Do not apply any fine limit */
 311                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 312                 return;
 313         }
 314
 315         /* Construct fine limit command */
 316         start_left = (((full_range - range + 1) * 2047) / full_range);
 317         start_right = 0xfff - start_left;
 318
 319         value[2] = start_left >> 4;
 320         value[3] = start_right >> 4;
 321         value[4] = 0xff;
 322         value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 323         value[6] = 0xff;
 324
 325         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 326 }
 327
 328 static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
 329 {
 330         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 331         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 332         __u8 i, j;
 333
 334         j = 0;
 335         while (j < 7*cmd->cmd_num) {
 336                 for (i = 0; i < 7; i++)
 337                         report->field[0]->value[i] = cmd->cmd[j++];
 338
 339                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 340         }
 341 }
 342
 343 /* Read current range and display it in terminal */
 344 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
 345 {
 346         struct hid_device *hid = to_hid_device(dev);
 347         struct lg4ff_device_entry *entry;
 348         struct lg_drv_data *drv_data;
 349         size_t count;
 350
 351         drv_data = hid_get_drvdata(hid);
 352         if (!drv_data) {
 353                 hid_err(hid, "Private driver data not found!\n");
 354                 return 0;
 355         }
 356
 357         entry = drv_data->device_props;
 358         if (!entry) {
 359                 hid_err(hid, "Device properties not found!\n");
 360                 return 0;
 361         }
 362
 363         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
 364         return count;
 365 }
 366
 367 /* Set range to user specified value, call appropriate function
 368  * according to the type of the wheel */
 369 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 370 {
 371         struct hid_device *hid = to_hid_device(dev);
 372         struct lg4ff_device_entry *entry;
 373         struct lg_drv_data *drv_data;
 374         __u16 range = simple_strtoul(buf, NULL, 10);
 375
 376         drv_data = hid_get_drvdata(hid);
 377         if (!drv_data) {
 378                 hid_err(hid, "Private driver data not found!\n");
 379                 return 0;
 380         }
 381
 382         entry = drv_data->device_props;
 383         if (!entry) {
 384                 hid_err(hid, "Device properties not found!\n");
 385                 return 0;
 386         }
 387
 388         if (range == 0)
 389                 range = entry->max_range;
 390
 391         /* Check if the wheel supports range setting
 392          * and that the range is within limits for the wheel */
 393         if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
 394                 entry->set_range(hid, range);
 395                 entry->range = range;
 396         }
 397
 398         return count;
 399 }
 400
 401 #ifdef CONFIG_LEDS_CLASS
 402 static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
 403 {
 404         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 405         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 406         __s32 *value = report->field[0]->value;
 407
 408         value[0] = 0xf8;
 409         value[1] = 0x12;
 410         value[2] = leds;
 411         value[3] = 0x00;
 412         value[4] = 0x00;
 413         value[5] = 0x00;
 414         value[6] = 0x00;
 415         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 416 }
 417
 418 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
 419                         enum led_brightness value)
 420 {
 421         struct device *dev = led_cdev->dev->parent;
 422         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 423         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 424         struct lg4ff_device_entry *entry;
 425         int i, state = 0;
 426
 427         if (!drv_data) {
 428                 hid_err(hid, "Device data not found.");
 429                 return;
 430         }
 431
 432         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 433
 434         if (!entry) {
 435                 hid_err(hid, "Device properties not found.");
 436                 return;
 437         }
 438
 439         for (i = 0; i < 5; i++) {
 440                 if (led_cdev != entry->led[i])
 441                         continue;
 442                 state = (entry->led_state >> i) & 1;
 443                 if (value == LED_OFF && state) {
 444                         entry->led_state &= ~(1 << i);
 445                         lg4ff_set_leds(hid, entry->led_state);
 446                 } else if (value != LED_OFF && !state) {
 447                         entry->led_state |= 1 << i;
 448                         lg4ff_set_leds(hid, entry->led_state);
 449                 }
 450                 break;
 451         }
 452 }
 453
 454 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
 455 {
 456         struct device *dev = led_cdev->dev->parent;
 457         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 458         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 459         struct lg4ff_device_entry *entry;
 460         int i, value = 0;
 461
 462         if (!drv_data) {
 463                 hid_err(hid, "Device data not found.");
 464                 return LED_OFF;
 465         }
 466
 467         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 468
 469         if (!entry) {
 470                 hid_err(hid, "Device properties not found.");
 471                 return LED_OFF;
 472         }
 473
 474         for (i = 0; i < 5; i++)
 475                 if (led_cdev == entry->led[i]) {
 476                         value = (entry->led_state >> i) & 1;
 477                         break;
 478                 }
 479
 480         return value ? LED_FULL : LED_OFF;
 481 }
 482 #endif
 483
 484 int lg4ff_init(struct hid_device *hid)
 485 {
 486         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 487         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 488         struct input_dev *dev = hidinput->input;
 489         struct hid_report *report;
 490         struct hid_field *field;
 491         struct lg4ff_device_entry *entry;
 492         struct lg_drv_data *drv_data;
 493         struct usb_device_descriptor *udesc;
 494         int error, i, j;
 495         __u16 bcdDevice, rev_maj, rev_min;
 496
 497         /* Find the report to use */
 498         if (list_empty(report_list)) {
 499                 hid_err(hid, "No output report found\n");
 500                 return -1;
 501         }
 502
 503         /* Check that the report looks ok */
 504         report = list_entry(report_list->next, struct hid_report, list);
 505         if (!report) {
 506                 hid_err(hid, "NULL output report\n");
 507                 return -1;
 508         }
 509
 510         field = report->field[0];
 511         if (!field) {
 512                 hid_err(hid, "NULL field\n");
 513                 return -1;
 514         }
 515
 516         /* Check what wheel has been connected */
 517         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
 518                 if (hid->product == lg4ff_devices[i].product_id) {
 519                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
 520                         break;
 521                 }
 522         }
 523
 524         if (i == ARRAY_SIZE(lg4ff_devices)) {
 525                 hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
 526                              "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
 527                 return -1;
 528         }
 529
 530         /* Attempt to switch wheel to native mode when applicable */
 531         udesc = &(hid_to_usb_dev(hid)->descriptor);
 532         if (!udesc) {
 533                 hid_err(hid, "NULL USB device descriptor\n");
 534                 return -1;
 535         }
 536         bcdDevice = le16_to_cpu(udesc->bcdDevice);
 537         rev_maj = bcdDevice >> 8;
 538         rev_min = bcdDevice & 0xff;
 539
 540         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
 541                 dbg_hid("Generic wheel detected, can it do native?\n");
 542                 dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);
 543
 544                 for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
 545                         if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
 546                                 hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
 547                                 hid_info(hid, "Switched to native mode\n");
 548                         }
 549                 }
 550         }
 551
 552         /* Set supported force feedback capabilities */
 553         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
 554                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
 555
 556         error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
 557
 558         if (error)
 559                 return error;
 560
 561         /* Check if autocentering is available and
 562          * set the centering force to zero by default */
 563         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
 564                 if (rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN) /* Formula Force EX expects different autocentering command */
 565                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
 566                 else
 567                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;
 568
 569                 dev->ff->set_autocenter(dev, 0);
 570         }
 571
 572         /* Get private driver data */
 573         drv_data = hid_get_drvdata(hid);
 574         if (!drv_data) {
 575                 hid_err(hid, "Cannot add device, private driver data not allocated\n");
 576                 return -1;
 577         }
 578
 579         /* Initialize device properties */
 580         entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
 581         if (!entry) {
 582                 hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
 583                 return -ENOMEM;
 584         }
 585         drv_data->device_props = entry;
 586
 587         entry->product_id = lg4ff_devices[i].product_id;
 588         entry->min_range = lg4ff_devices[i].min_range;
 589         entry->max_range = lg4ff_devices[i].max_range;
 590         entry->set_range = lg4ff_devices[i].set_range;
 591
 592         /* Create sysfs interface */
 593         error = device_create_file(&hid->dev, &dev_attr_range);
 594         if (error)
 595                 return error;
 596         dbg_hid("sysfs interface created\n");
 597
 598         /* Set the maximum range to start with */
 599         entry->range = entry->max_range;
 600         if (entry->set_range != NULL)
 601                 entry->set_range(hid, entry->range);
 602
 603 #ifdef CONFIG_LEDS_CLASS
 604         /* register led subsystem - G27 only */
 605         entry->led_state = 0;
 606         for (j = 0; j < 5; j++)
 607                 entry->led[j] = NULL;
 608
 609         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
 610                 struct led_classdev *led;
 611                 size_t name_sz;
 612                 char *name;
 613
 614                 lg4ff_set_leds(hid, 0);
 615
 616                 name_sz = strlen(dev_name(&hid->dev)) + 8;
 617
 618                 for (j = 0; j < 5; j++) {
 619                         led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
 620                         if (!led) {
 621                                 hid_err(hid, "can't allocate memory for LED %d\n", j);
 622                                 goto err;
 623                         }
 624
 625                         name = (void *)(&led[1]);
 626                         snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
 627                         led->name = name;
 628                         led->brightness = 0;
 629                         led->max_brightness = 1;
 630                         led->brightness_get = lg4ff_led_get_brightness;
 631                         led->brightness_set = lg4ff_led_set_brightness;
 632
 633                         entry->led[j] = led;
 634                         error = led_classdev_register(&hid->dev, led);
 635
 636                         if (error) {
 637                                 hid_err(hid, "failed to register LED %d. Aborting.\n", j);
 638 err:
 639                                 /* Deregister LEDs (if any) */
 640                                 for (j = 0; j < 5; j++) {
 641                                         led = entry->led[j];
 642                                         entry->led[j] = NULL;
 643                                         if (!led)
 644                                                 continue;
 645                                         led_classdev_unregister(led);
 646                                         kfree(led);
 647                                 }
 648                                 goto out;       /* Let the driver continue without LEDs */
 649                         }
 650                 }
 651         }
 652 out:
 653 #endif
 654         hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
 655         return 0;
 656 }
 657
 658
 659
 660 int lg4ff_deinit(struct hid_device *hid)
 661 {
 662         struct lg4ff_device_entry *entry;
 663         struct lg_drv_data *drv_data;
 664
 665         device_remove_file(&hid->dev, &dev_attr_range);
 666
 667         drv_data = hid_get_drvdata(hid);
 668         if (!drv_data) {
 669                 hid_err(hid, "Error while deinitializing device, no private driver data.\n");
 670                 return -1;
 671         }
 672         entry = drv_data->device_props;
 673         if (!entry) {
 674                 hid_err(hid, "Error while deinitializing device, no device properties data.\n");
 675                 return -1;
 676         }
 677
 678 #ifdef CONFIG_LEDS_CLASS
 679         {
 680                 int j;
 681                 struct led_classdev *led;
 682
 683                 /* Deregister LEDs (if any) */
 684                 for (j = 0; j < 5; j++) {
 685
 686                         led = entry->led[j];
 687                         entry->led[j] = NULL;
 688                         if (!led)
 689                                 continue;
 690                         led_classdev_unregister(led);
 691                         kfree(led);
 692                 }
 693         }
 694 #endif
 695
 696         /* Deallocate memory */
 697         kfree(entry);
 698
 699         dbg_hid("Device successfully unregistered\n");
 700         return 0;
 701 }