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 DFP_REV_MAJ 0x11
  38 #define DFP_REV_MIN 0x06
  39 #define FFEX_REV_MAJ 0x21
  40 #define FFEX_REV_MIN 0x00
  41 #define G25_REV_MAJ 0x12
  42 #define G25_REV_MIN 0x22
  43 #define G27_REV_MAJ 0x12
  44 #define G27_REV_MIN 0x38
  45
  46 #define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
  47
  48 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
  49 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
  50 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
  51 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
  52
  53 static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);
  54
  55 struct lg4ff_device_entry {
  56         __u16 range;
  57         __u16 min_range;
  58         __u16 max_range;
  59 #ifdef CONFIG_LEDS_CLASS
  60         __u8  led_state;
  61         struct led_classdev *led[5];
  62 #endif
  63         struct list_head list;
  64         void (*set_range)(struct hid_device *hid, u16 range);
  65 };
  66
  67 static const signed short lg4ff_wheel_effects[] = {
  68         FF_CONSTANT,
  69         FF_AUTOCENTER,
  70         -1
  71 };
  72
  73 struct lg4ff_wheel {
  74         const __u32 product_id;
  75         const signed short *ff_effects;
  76         const __u16 min_range;
  77         const __u16 max_range;
  78         void (*set_range)(struct hid_device *hid, u16 range);
  79 };
  80
  81 static const struct lg4ff_wheel lg4ff_devices[] = {
  82         {USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
  83         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
  84         {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
  85         {USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  86         {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  87         {USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  88         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
  89         {USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
  90 };
  91
  92 struct lg4ff_native_cmd {
  93         const __u8 cmd_num;     /* Number of commands to send */
  94         const __u8 cmd[];
  95 };
  96
  97 struct lg4ff_usb_revision {
  98         const __u16 rev_maj;
  99         const __u16 rev_min;
 100         const struct lg4ff_native_cmd *command;
 101 };
 102
 103 static const struct lg4ff_native_cmd native_dfp = {
 104         1,
 105         {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
 106 };
 107
 108 static const struct lg4ff_native_cmd native_dfgt = {
 109         2,
 110         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 111          0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 112 };
 113
 114 static const struct lg4ff_native_cmd native_g25 = {
 115         1,
 116         {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
 117 };
 118
 119 static const struct lg4ff_native_cmd native_g27 = {
 120         2,
 121         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 122          0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 123 };
 124
 125 static const struct lg4ff_usb_revision lg4ff_revs[] = {
 126         {DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt},     /* Driving Force GT */
 127         {DFP_REV_MAJ,  DFP_REV_MIN,  &native_dfp},      /* Driving Force Pro */
 128         {G25_REV_MAJ,  G25_REV_MIN,  &native_g25},      /* G25 */
 129         {G27_REV_MAJ,  G27_REV_MIN,  &native_g27},      /* G27 */
 130 };
 131
 132 static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
 133 {
 134         struct hid_device *hid = input_get_drvdata(dev);
 135         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 136         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 137         int x;
 138
 139 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
 140
 141         switch (effect->type) {
 142         case FF_CONSTANT:
 143                 x = effect->u.ramp.start_level + 0x80;  /* 0x80 is no force */
 144                 CLAMP(x);
 145                 report->field[0]->value[0] = 0x11;      /* Slot 1 */
 146                 report->field[0]->value[1] = 0x08;
 147                 report->field[0]->value[2] = x;
 148                 report->field[0]->value[3] = 0x80;
 149                 report->field[0]->value[4] = 0x00;
 150                 report->field[0]->value[5] = 0x00;
 151                 report->field[0]->value[6] = 0x00;
 152
 153                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 154                 break;
 155         }
 156         return 0;
 157 }
 158
 159 /* Sends default autocentering command compatible with
 160  * all wheels except Formula Force EX */
 161 static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 162 {
 163         struct hid_device *hid = input_get_drvdata(dev);
 164         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 165         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 166
 167         report->field[0]->value[0] = 0xfe;
 168         report->field[0]->value[1] = 0x0d;
 169         report->field[0]->value[2] = magnitude >> 13;
 170         report->field[0]->value[3] = magnitude >> 13;
 171         report->field[0]->value[4] = magnitude >> 8;
 172         report->field[0]->value[5] = 0x00;
 173         report->field[0]->value[6] = 0x00;
 174
 175         usbhid_submit_report(hid, report, USB_DIR_OUT);
 176 }
 177
 178 /* Sends autocentering command compatible with Formula Force EX */
 179 static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 180 {
 181         struct hid_device *hid = input_get_drvdata(dev);
 182         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 183         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 184         magnitude = magnitude * 90 / 65535;
 185
 186
 187         report->field[0]->value[0] = 0xfe;
 188         report->field[0]->value[1] = 0x03;
 189         report->field[0]->value[2] = magnitude >> 14;
 190         report->field[0]->value[3] = magnitude >> 14;
 191         report->field[0]->value[4] = magnitude;
 192         report->field[0]->value[5] = 0x00;
 193         report->field[0]->value[6] = 0x00;
 194
 195         usbhid_submit_report(hid, report, USB_DIR_OUT);
 196 }
 197
 198 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 199 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 200 {
 201         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 202         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 203         dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 204
 205         report->field[0]->value[0] = 0xf8;
 206         report->field[0]->value[1] = 0x81;
 207         report->field[0]->value[2] = range & 0x00ff;
 208         report->field[0]->value[3] = (range & 0xff00) >> 8;
 209         report->field[0]->value[4] = 0x00;
 210         report->field[0]->value[5] = 0x00;
 211         report->field[0]->value[6] = 0x00;
 212
 213         usbhid_submit_report(hid, report, USB_DIR_OUT);
 214 }
 215
 216 /* Sends commands to set range compatible with Driving Force Pro wheel */
 217 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
 218 {
 219         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 220         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 221         int start_left, start_right, full_range;
 222         dbg_hid("Driving Force Pro: setting range to %u\n", range);
 223
 224         /* Prepare "coarse" limit command */
 225         report->field[0]->value[0] = 0xf8;
 226         report->field[0]->value[1] = 0x00;      /* Set later */
 227         report->field[0]->value[2] = 0x00;
 228         report->field[0]->value[3] = 0x00;
 229         report->field[0]->value[4] = 0x00;
 230         report->field[0]->value[5] = 0x00;
 231         report->field[0]->value[6] = 0x00;
 232
 233         if (range > 200) {
 234                 report->field[0]->value[1] = 0x03;
 235                 full_range = 900;
 236         } else {
 237                 report->field[0]->value[1] = 0x02;
 238                 full_range = 200;
 239         }
 240         usbhid_submit_report(hid, report, USB_DIR_OUT);
 241
 242         /* Prepare "fine" limit command */
 243         report->field[0]->value[0] = 0x81;
 244         report->field[0]->value[1] = 0x0b;
 245         report->field[0]->value[2] = 0x00;
 246         report->field[0]->value[3] = 0x00;
 247         report->field[0]->value[4] = 0x00;
 248         report->field[0]->value[5] = 0x00;
 249         report->field[0]->value[6] = 0x00;
 250
 251         if (range == 200 || range == 900) {     /* Do not apply any fine limit */
 252                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 253                 return;
 254         }
 255
 256         /* Construct fine limit command */
 257         start_left = (((full_range - range + 1) * 2047) / full_range);
 258         start_right = 0xfff - start_left;
 259
 260         report->field[0]->value[2] = start_left >> 4;
 261         report->field[0]->value[3] = start_right >> 4;
 262         report->field[0]->value[4] = 0xff;
 263         report->field[0]->value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 264         report->field[0]->value[6] = 0xff;
 265
 266         usbhid_submit_report(hid, report, USB_DIR_OUT);
 267 }
 268
 269 static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
 270 {
 271         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 272         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 273         __u8 i, j;
 274
 275         j = 0;
 276         while (j < 7*cmd->cmd_num) {
 277                 for (i = 0; i < 7; i++)
 278                         report->field[0]->value[i] = cmd->cmd[j++];
 279
 280                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 281         }
 282 }
 283
 284 /* Read current range and display it in terminal */
 285 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
 286 {
 287         struct hid_device *hid = to_hid_device(dev);
 288         struct lg4ff_device_entry *entry;
 289         struct lg_drv_data *drv_data;
 290         size_t count;
 291
 292         drv_data = hid_get_drvdata(hid);
 293         if (!drv_data) {
 294                 hid_err(hid, "Private driver data not found!\n");
 295                 return 0;
 296         }
 297
 298         entry = drv_data->device_props;
 299         if (!entry) {
 300                 hid_err(hid, "Device properties not found!\n");
 301                 return 0;
 302         }
 303
 304         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
 305         return count;
 306 }
 307
 308 /* Set range to user specified value, call appropriate function
 309  * according to the type of the wheel */
 310 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 311 {
 312         struct hid_device *hid = to_hid_device(dev);
 313         struct lg4ff_device_entry *entry;
 314         struct lg_drv_data *drv_data;
 315         __u16 range = simple_strtoul(buf, NULL, 10);
 316
 317         drv_data = hid_get_drvdata(hid);
 318         if (!drv_data) {
 319                 hid_err(hid, "Private driver data not found!\n");
 320                 return 0;
 321         }
 322
 323         entry = drv_data->device_props;
 324         if (!entry) {
 325                 hid_err(hid, "Device properties not found!\n");
 326                 return 0;
 327         }
 328
 329         if (range == 0)
 330                 range = entry->max_range;
 331
 332         /* Check if the wheel supports range setting
 333          * and that the range is within limits for the wheel */
 334         if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
 335                 entry->set_range(hid, range);
 336                 entry->range = range;
 337         }
 338
 339         return count;
 340 }
 341
 342 #ifdef CONFIG_LEDS_CLASS
 343 static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
 344 {
 345         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 346         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 347
 348         report->field[0]->value[0] = 0xf8;
 349         report->field[0]->value[1] = 0x12;
 350         report->field[0]->value[2] = leds;
 351         report->field[0]->value[3] = 0x00;
 352         report->field[0]->value[4] = 0x00;
 353         report->field[0]->value[5] = 0x00;
 354         report->field[0]->value[6] = 0x00;
 355         usbhid_submit_report(hid, report, USB_DIR_OUT);
 356 }
 357
 358 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
 359                         enum led_brightness value)
 360 {
 361         struct device *dev = led_cdev->dev->parent;
 362         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 363         struct lg_drv_data *drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);
 364         struct lg4ff_device_entry *entry;
 365         int i, state = 0;
 366
 367         if (!drv_data) {
 368                 hid_err(hid, "Device data not found.");
 369                 return;
 370         }
 371
 372         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 373
 374         if (!entry) {
 375                 hid_err(hid, "Device properties not found.");
 376                 return;
 377         }
 378
 379         for (i = 0; i < 5; i++) {
 380                 if (led_cdev != entry->led[i])
 381                         continue;
 382                 state = (entry->led_state >> i) & 1;
 383                 if (value == LED_OFF && state) {
 384                         entry->led_state &= ~(1 << i);
 385                         lg4ff_set_leds(hid, entry->led_state);
 386                 } else if (value != LED_OFF && !state) {
 387                         entry->led_state |= 1 << i;
 388                         lg4ff_set_leds(hid, entry->led_state);
 389                 }
 390                 break;
 391         }
 392 }
 393
 394 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
 395 {
 396         struct device *dev = led_cdev->dev->parent;
 397         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 398         struct lg_drv_data *drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);
 399         struct lg4ff_device_entry *entry;
 400         int i, value = 0;
 401
 402         if (!drv_data) {
 403                 hid_err(hid, "Device data not found.");
 404                 return LED_OFF;
 405         }
 406
 407         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 408
 409         if (!entry) {
 410                 hid_err(hid, "Device properties not found.");
 411                 return LED_OFF;
 412         }
 413
 414         for (i = 0; i < 5; i++)
 415                 if (led_cdev == entry->led[i]) {
 416                         value = (entry->led_state >> i) & 1;
 417                         break;
 418                 }
 419
 420         return value ? LED_FULL : LED_OFF;
 421 }
 422 #endif
 423
 424 int lg4ff_init(struct hid_device *hid)
 425 {
 426         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 427         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 428         struct input_dev *dev = hidinput->input;
 429         struct hid_report *report;
 430         struct hid_field *field;
 431         struct lg4ff_device_entry *entry;
 432         struct lg_drv_data *drv_data;
 433         struct usb_device_descriptor *udesc;
 434         int error, i, j;
 435         __u16 bcdDevice, rev_maj, rev_min;
 436
 437         /* Find the report to use */
 438         if (list_empty(report_list)) {
 439                 hid_err(hid, "No output report found\n");
 440                 return -1;
 441         }
 442
 443         /* Check that the report looks ok */
 444         report = list_entry(report_list->next, struct hid_report, list);
 445         if (!report) {
 446                 hid_err(hid, "NULL output report\n");
 447                 return -1;
 448         }
 449
 450         field = report->field[0];
 451         if (!field) {
 452                 hid_err(hid, "NULL field\n");
 453                 return -1;
 454         }
 455
 456         /* Check what wheel has been connected */
 457         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
 458                 if (hid->product == lg4ff_devices[i].product_id) {
 459                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
 460                         break;
 461                 }
 462         }
 463
 464         if (i == ARRAY_SIZE(lg4ff_devices)) {
 465                 hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
 466                              "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
 467                 return -1;
 468         }
 469
 470         /* Attempt to switch wheel to native mode when applicable */
 471         udesc = &(hid_to_usb_dev(hid)->descriptor);
 472         if (!udesc) {
 473                 hid_err(hid, "NULL USB device descriptor\n");
 474                 return -1;
 475         }
 476         bcdDevice = le16_to_cpu(udesc->bcdDevice);
 477         rev_maj = bcdDevice >> 8;
 478         rev_min = bcdDevice & 0xff;
 479
 480         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
 481                 dbg_hid("Generic wheel detected, can it do native?\n");
 482                 dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);
 483
 484                 for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
 485                         if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
 486                                 hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
 487                                 hid_info(hid, "Switched to native mode\n");
 488                         }
 489                 }
 490         }
 491
 492         /* Set supported force feedback capabilities */
 493         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
 494                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
 495
 496         error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
 497
 498         if (error)
 499                 return error;
 500
 501         /* Check if autocentering is available and
 502          * set the centering force to zero by default */
 503         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
 504                 if(rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN)  /* Formula Force EX expects different autocentering command */
 505                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
 506                 else
 507                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;
 508
 509                 dev->ff->set_autocenter(dev, 0);
 510         }
 511
 512         /* Get private driver data */
 513         drv_data = hid_get_drvdata(hid);
 514         if (!drv_data) {
 515                 hid_err(hid, "Cannot add device, private driver data not allocated\n");
 516                 return -1;
 517         }
 518
 519         /* Initialize device properties */
 520         entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
 521         if (!entry) {
 522                 hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
 523                 return -ENOMEM;
 524         }
 525         drv_data->device_props = entry;
 526
 527         entry->min_range = lg4ff_devices[i].min_range;
 528         entry->max_range = lg4ff_devices[i].max_range;
 529         entry->set_range = lg4ff_devices[i].set_range;
 530
 531         /* Create sysfs interface */
 532         error = device_create_file(&hid->dev, &dev_attr_range);
 533         if (error)
 534                 return error;
 535         dbg_hid("sysfs interface created\n");
 536
 537         /* Set the maximum range to start with */
 538         entry->range = entry->max_range;
 539         if (entry->set_range != NULL)
 540                 entry->set_range(hid, entry->range);
 541
 542 #ifdef CONFIG_LEDS_CLASS
 543         /* register led subsystem - G27 only */
 544         entry->led_state = 0;
 545         for (j = 0; j < 5; j++)
 546                 entry->led[j] = NULL;
 547
 548         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
 549                 struct led_classdev *led;
 550                 size_t name_sz;
 551                 char *name;
 552
 553                 lg4ff_set_leds(hid, 0);
 554
 555                 name_sz = strlen(dev_name(&hid->dev)) + 8;
 556
 557                 for (j = 0; j < 5; j++) {
 558                         led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
 559                         if (!led) {
 560                                 hid_err(hid, "can't allocate memory for LED %d\n", j);
 561                                 goto err;
 562                         }
 563
 564                         name = (void *)(&led[1]);
 565                         snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
 566                         led->name = name;
 567                         led->brightness = 0;
 568                         led->max_brightness = 1;
 569                         led->brightness_get = lg4ff_led_get_brightness;
 570                         led->brightness_set = lg4ff_led_set_brightness;
 571
 572                         entry->led[j] = led;
 573                         error = led_classdev_register(&hid->dev, led);
 574
 575                         if (error) {
 576                                 hid_err(hid, "failed to register LED %d. Aborting.\n", j);
 577 err:
 578                                 /* Deregister LEDs (if any) */
 579                                 for (j = 0; j < 5; j++) {
 580                                         led = entry->led[j];
 581                                         entry->led[j] = NULL;
 582                                         if (!led)
 583                                                 continue;
 584                                         led_classdev_unregister(led);
 585                                         kfree(led);
 586                                 }
 587                                 goto out;       /* Let the driver continue without LEDs */
 588                         }
 589                 }
 590         }
 591 out:
 592 #endif
 593         hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
 594         return 0;
 595 }
 596
 597 int lg4ff_deinit(struct hid_device *hid)
 598 {
 599         struct lg4ff_device_entry *entry;
 600         struct lg_drv_data *drv_data;
 601
 602         device_remove_file(&hid->dev, &dev_attr_range);
 603
 604         drv_data = hid_get_drvdata(hid);
 605         if (!drv_data) {
 606                 hid_err(hid, "Error while deinitializing device, no private driver data.\n");
 607                 return -1;
 608         }
 609         entry = drv_data->device_props;
 610         if (!entry) {
 611                 hid_err(hid, "Error while deinitializing device, no device properties data.\n");
 612                 return -1;
 613         }
 614
 615 #ifdef CONFIG_LEDS_CLASS
 616         {
 617                 int j;
 618                 struct led_classdev *led;
 619
 620                 /* Deregister LEDs (if any) */
 621                 for (j = 0; j < 5; j++) {
 622
 623                         led = entry->led[j];
 624                         entry->led[j] = NULL;
 625                         if (!led)
 626                                 continue;
 627                         led_classdev_unregister(led);
 628                         kfree(led);
 629                 }
 630         }
 631 #endif
 632
 633         /* Deallocate memory */
 634         kfree(entry);
 635
 636         dbg_hid("Device successfully unregistered\n");
 637         return 0;
 638 }