linux/drivers/hid/hid-lg4ff.c
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   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
  49static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
  50static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
  51static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
  52static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
  53
  54static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);
  55
  56struct 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
  69static const signed short lg4ff_wheel_effects[] = {
  70        FF_CONSTANT,
  71        FF_AUTOCENTER,
  72        -1
  73};
  74
  75struct 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
  83static 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
  94struct lg4ff_native_cmd {
  95        const __u8 cmd_num;     /* Number of commands to send */
  96        const __u8 cmd[];
  97};
  98
  99struct lg4ff_usb_revision {
 100        const __u16 rev_maj;
 101        const __u16 rev_min;
 102        const struct lg4ff_native_cmd *command;
 103};
 104
 105static const struct lg4ff_native_cmd native_dfp = {
 106        1,
 107        {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
 108};
 109
 110static 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
 116static const struct lg4ff_native_cmd native_g25 = {
 117        1,
 118        {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
 119};
 120
 121static 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
 127static 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 */
 136static __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
 159int 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
 185static 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 */
 215static 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 */
 234static 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 */
 254static 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 */
 274static 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
 328static 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 */
 344static 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 */
 369static 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
 402static 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
 418static 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
 454static 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
 484int 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);
 638err:
 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        }
 652out:
 653#endif
 654        hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
 655        return 0;
 656}
 657
 658
 659
 660int 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}
 702
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