drivers/hid/hid-lg4ff.c

   1 /*
   2  *  Force feedback support for Logitech Speed Force Wireless
   3  *
   4  *  http://wiibrew.org/wiki/Logitech_USB_steering_wheel
   5  *
   6  *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25
  26 #include <linux/input.h>
  27 #include <linux/usb.h>
  28 #include <linux/hid.h>
  29
  30 #include "usbhid/usbhid.h"
  31 #include "hid-lg.h"
  32 #include "hid-ids.h"
  33
  34 #define DFGT_REV_MAJ 0x13
  35 #define DFGT_REV_MIN 0x22
  36 #define DFP_REV_MAJ 0x11
  37 #define DFP_REV_MIN 0x06
  38 #define FFEX_REV_MAJ 0x21
  39 #define FFEX_REV_MIN 0x00
  40 #define G25_REV_MAJ 0x12
  41 #define G25_REV_MIN 0x22
  42 #define G27_REV_MAJ 0x12
  43 #define G27_REV_MIN 0x38
  44
  45 #define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
  46
  47 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
  48 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
  49 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
  50 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
  51
  52 static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);
  53
  54 static bool list_inited;
  55
  56 struct lg4ff_device_entry {
  57         char  *device_id;       /* Use name in respective kobject structure's address as the ID */
  58         __u16 range;
  59         __u16 min_range;
  60         __u16 max_range;
  61         __u8  leds;
  62         struct list_head list;
  63         void (*set_range)(struct hid_device *hid, u16 range);
  64 };
  65
  66 static struct lg4ff_device_entry device_list;
  67
  68 static const signed short lg4ff_wheel_effects[] = {
  69         FF_CONSTANT,
  70         FF_AUTOCENTER,
  71         -1
  72 };
  73
  74 struct lg4ff_wheel {
  75         const __u32 product_id;
  76         const signed short *ff_effects;
  77         const __u16 min_range;
  78         const __u16 max_range;
  79         void (*set_range)(struct hid_device *hid, u16 range);
  80 };
  81
  82 static const struct lg4ff_wheel lg4ff_devices[] = {
  83         {USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
  84         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
  85         {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
  86         {USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  87         {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  88         {USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  89         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
  90         {USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
  91 };
  92
  93 struct lg4ff_native_cmd {
  94         const __u8 cmd_num;     /* Number of commands to send */
  95         const __u8 cmd[];
  96 };
  97
  98 struct lg4ff_usb_revision {
  99         const __u16 rev_maj;
 100         const __u16 rev_min;
 101         const struct lg4ff_native_cmd *command;
 102 };
 103
 104 static const struct lg4ff_native_cmd native_dfp = {
 105         1,
 106         {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
 107 };
 108
 109 static const struct lg4ff_native_cmd native_dfgt = {
 110         2,
 111         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 112          0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 113 };
 114
 115 static const struct lg4ff_native_cmd native_g25 = {
 116         1,
 117         {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
 118 };
 119
 120 static const struct lg4ff_native_cmd native_g27 = {
 121         2,
 122         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 123          0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 124 };
 125
 126 static const struct lg4ff_usb_revision lg4ff_revs[] = {
 127         {DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt},     /* Driving Force GT */
 128         {DFP_REV_MAJ,  DFP_REV_MIN,  &native_dfp},      /* Driving Force Pro */
 129         {G25_REV_MAJ,  G25_REV_MIN,  &native_g25},      /* G25 */
 130         {G27_REV_MAJ,  G27_REV_MIN,  &native_g27},      /* G27 */
 131 };
 132
 133 static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
 134 {
 135         struct hid_device *hid = input_get_drvdata(dev);
 136         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 137         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 138         int x;
 139
 140 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
 141
 142         switch (effect->type) {
 143         case FF_CONSTANT:
 144                 x = effect->u.ramp.start_level + 0x80;  /* 0x80 is no force */
 145                 CLAMP(x);
 146                 report->field[0]->value[0] = 0x11;      /* Slot 1 */
 147                 report->field[0]->value[1] = 0x08;
 148                 report->field[0]->value[2] = x;
 149                 report->field[0]->value[3] = 0x80;
 150                 report->field[0]->value[4] = 0x00;
 151                 report->field[0]->value[5] = 0x00;
 152                 report->field[0]->value[6] = 0x00;
 153
 154                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 155                 break;
 156         }
 157         return 0;
 158 }
 159
 160 /* Sends default autocentering command compatible with
 161  * all wheels except Formula Force EX */
 162 static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 163 {
 164         struct hid_device *hid = input_get_drvdata(dev);
 165         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 166         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 167
 168         report->field[0]->value[0] = 0xfe;
 169         report->field[0]->value[1] = 0x0d;
 170         report->field[0]->value[2] = magnitude >> 13;
 171         report->field[0]->value[3] = magnitude >> 13;
 172         report->field[0]->value[4] = magnitude >> 8;
 173         report->field[0]->value[5] = 0x00;
 174         report->field[0]->value[6] = 0x00;
 175
 176         usbhid_submit_report(hid, report, USB_DIR_OUT);
 177 }
 178
 179 /* Sends autocentering command compatible with Formula Force EX */
 180 static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 181 {
 182         struct hid_device *hid = input_get_drvdata(dev);
 183         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 184         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 185         magnitude = magnitude * 90 / 65535;
 186
 187
 188         report->field[0]->value[0] = 0xfe;
 189         report->field[0]->value[1] = 0x03;
 190         report->field[0]->value[2] = magnitude >> 14;
 191         report->field[0]->value[3] = magnitude >> 14;
 192         report->field[0]->value[4] = magnitude;
 193         report->field[0]->value[5] = 0x00;
 194         report->field[0]->value[6] = 0x00;
 195
 196         usbhid_submit_report(hid, report, USB_DIR_OUT);
 197 }
 198
 199 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 200 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 201 {
 202         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 203         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 204         dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 205
 206         report->field[0]->value[0] = 0xf8;
 207         report->field[0]->value[1] = 0x81;
 208         report->field[0]->value[2] = range & 0x00ff;
 209         report->field[0]->value[3] = (range & 0xff00) >> 8;
 210         report->field[0]->value[4] = 0x00;
 211         report->field[0]->value[5] = 0x00;
 212         report->field[0]->value[6] = 0x00;
 213
 214         usbhid_submit_report(hid, report, USB_DIR_OUT);
 215 }
 216
 217 /* Sends commands to set range compatible with Driving Force Pro wheel */
 218 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
 219 {
 220         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 221         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 222         int start_left, start_right, full_range;
 223         dbg_hid("Driving Force Pro: setting range to %u\n", range);
 224
 225         /* Prepare "coarse" limit command */
 226         report->field[0]->value[0] = 0xf8;
 227         report->field[0]->value[1] = 0x00;      /* Set later */
 228         report->field[0]->value[2] = 0x00;
 229         report->field[0]->value[3] = 0x00;
 230         report->field[0]->value[4] = 0x00;
 231         report->field[0]->value[5] = 0x00;
 232         report->field[0]->value[6] = 0x00;
 233
 234         if (range > 200) {
 235                 report->field[0]->value[1] = 0x03;
 236                 full_range = 900;
 237         } else {
 238                 report->field[0]->value[1] = 0x02;
 239                 full_range = 200;
 240         }
 241         usbhid_submit_report(hid, report, USB_DIR_OUT);
 242
 243         /* Prepare "fine" limit command */
 244         report->field[0]->value[0] = 0x81;
 245         report->field[0]->value[1] = 0x0b;
 246         report->field[0]->value[2] = 0x00;
 247         report->field[0]->value[3] = 0x00;
 248         report->field[0]->value[4] = 0x00;
 249         report->field[0]->value[5] = 0x00;
 250         report->field[0]->value[6] = 0x00;
 251
 252         if (range == 200 || range == 900) {     /* Do not apply any fine limit */
 253                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 254                 return;
 255         }
 256
 257         /* Construct fine limit command */
 258         start_left = (((full_range - range + 1) * 2047) / full_range);
 259         start_right = 0xfff - start_left;
 260
 261         report->field[0]->value[2] = start_left >> 4;
 262         report->field[0]->value[3] = start_right >> 4;
 263         report->field[0]->value[4] = 0xff;
 264         report->field[0]->value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 265         report->field[0]->value[6] = 0xff;
 266
 267         usbhid_submit_report(hid, report, USB_DIR_OUT);
 268 }
 269
 270 static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
 271 {
 272         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 273         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 274         __u8 i, j;
 275
 276         j = 0;
 277         while (j < 7*cmd->cmd_num) {
 278                 for (i = 0; i < 7; i++)
 279                         report->field[0]->value[i] = cmd->cmd[j++];
 280
 281                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 282         }
 283 }
 284
 285 /* Read current range and display it in terminal */
 286 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
 287 {
 288         struct lg4ff_device_entry *entry = 0;
 289         struct list_head *h;
 290         struct hid_device *hid = to_hid_device(dev);
 291         size_t count;
 292
 293         list_for_each(h, &device_list.list) {
 294                 entry = list_entry(h, struct lg4ff_device_entry, list);
 295                 if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0)
 296                         break;
 297         }
 298         if (h == &device_list.list) {
 299                 dbg_hid("Device not found!");
 300                 return 0;
 301         }
 302
 303         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
 304         return count;
 305 }
 306
 307 /* Set range to user specified value, call appropriate function
 308  * according to the type of the wheel */
 309 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 310 {
 311         struct lg4ff_device_entry *entry = 0;
 312         struct list_head *h;
 313         struct hid_device *hid = to_hid_device(dev);
 314         __u16 range = simple_strtoul(buf, NULL, 10);
 315
 316         list_for_each(h, &device_list.list) {
 317                 entry = list_entry(h, struct lg4ff_device_entry, list);
 318                 if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0)
 319                         break;
 320         }
 321         if (h == &device_list.list) {
 322                 dbg_hid("Device not found!");
 323                 return count;
 324         }
 325
 326         if (range == 0)
 327                 range = entry->max_range;
 328
 329         /* Check if the wheel supports range setting
 330          * and that the range is within limits for the wheel */
 331         if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
 332                 entry->set_range(hid, range);
 333                 entry->range = range;
 334         }
 335
 336         return count;
 337 }
 338
 339 int lg4ff_init(struct hid_device *hid)
 340 {
 341         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 342         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 343         struct input_dev *dev = hidinput->input;
 344         struct hid_report *report;
 345         struct hid_field *field;
 346         struct lg4ff_device_entry *entry;
 347         struct usb_device_descriptor *udesc;
 348         int error, i, j;
 349         __u16 bcdDevice, rev_maj, rev_min;
 350
 351         /* Find the report to use */
 352         if (list_empty(report_list)) {
 353                 hid_err(hid, "No output report found\n");
 354                 return -1;
 355         }
 356
 357         /* Check that the report looks ok */
 358         report = list_entry(report_list->next, struct hid_report, list);
 359         if (!report) {
 360                 hid_err(hid, "NULL output report\n");
 361                 return -1;
 362         }
 363
 364         field = report->field[0];
 365         if (!field) {
 366                 hid_err(hid, "NULL field\n");
 367                 return -1;
 368         }
 369
 370         /* Check what wheel has been connected */
 371         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
 372                 if (hid->product == lg4ff_devices[i].product_id) {
 373                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
 374                         break;
 375                 }
 376         }
 377
 378         if (i == ARRAY_SIZE(lg4ff_devices)) {
 379                 hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
 380                              "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
 381                 return -1;
 382         }
 383
 384         /* Attempt to switch wheel to native mode when applicable */
 385         udesc = &(hid_to_usb_dev(hid)->descriptor);
 386         if (!udesc) {
 387                 hid_err(hid, "NULL USB device descriptor\n");
 388                 return -1;
 389         }
 390         bcdDevice = le16_to_cpu(udesc->bcdDevice);
 391         rev_maj = bcdDevice >> 8;
 392         rev_min = bcdDevice & 0xff;
 393
 394         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
 395                 dbg_hid("Generic wheel detected, can it do native?\n");
 396                 dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);
 397
 398                 for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
 399                         if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
 400                                 hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
 401                                 hid_info(hid, "Switched to native mode\n");
 402                         }
 403                 }
 404         }
 405
 406         /* Set supported force feedback capabilities */
 407         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
 408                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
 409
 410         error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
 411
 412         if (error)
 413                 return error;
 414
 415         /* Check if autocentering is available and
 416          * set the centering force to zero by default */
 417         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
 418                 if(rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN)  /* Formula Force EX expects different autocentering command */
 419                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
 420                 else
 421                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;
 422
 423                 dev->ff->set_autocenter(dev, 0);
 424         }
 425
 426                 /* Initialize device_list if this is the first device to handle by lg4ff */
 427         if (!list_inited) {
 428                 INIT_LIST_HEAD(&device_list.list);
 429                 list_inited = 1;
 430         }
 431
 432         /* Add the device to device_list */
 433         entry = (struct lg4ff_device_entry *)kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
 434         if (!entry) {
 435                 hid_err(hid, "Cannot add device, insufficient memory.\n");
 436                 return -ENOMEM;
 437         }
 438         entry->device_id = (char *)kzalloc(strlen((&hid->dev)->kobj.name) + 1, GFP_KERNEL);
 439         if (!entry->device_id) {
 440                 hid_err(hid, "Cannot set device_id, insufficient memory.\n");
 441                 return -ENOMEM;
 442         }
 443         strcpy(entry->device_id, (&hid->dev)->kobj.name);
 444         entry->min_range = lg4ff_devices[i].min_range;
 445         entry->max_range = lg4ff_devices[i].max_range;
 446         entry->set_range = lg4ff_devices[i].set_range;
 447         list_add(&entry->list, &device_list.list);
 448
 449         /* Create sysfs interface */
 450         error = device_create_file(&hid->dev, &dev_attr_range);
 451         if (error)
 452                 return error;
 453         dbg_hid("sysfs interface created\n");
 454
 455         /* Set the maximum range to start with */
 456         entry->range = entry->max_range;
 457         if (entry->set_range != NULL)
 458                 entry->set_range(hid, entry->range);
 459
 460         hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");
 461         return 0;
 462 }
 463
 464 int lg4ff_deinit(struct hid_device *hid)
 465 {
 466         bool found = 0;
 467         struct lg4ff_device_entry *entry;
 468         struct list_head *h, *g;
 469         list_for_each_safe(h, g, &device_list.list) {
 470                 entry = list_entry(h, struct lg4ff_device_entry, list);
 471                 if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0) {
 472                         list_del(h);
 473                         kfree(entry->device_id);
 474                         kfree(entry);
 475                         found = 1;
 476                         break;
 477                 }
 478         }
 479
 480         if (!found) {
 481                 dbg_hid("Device entry not found!\n");
 482                 return -1;
 483         }
 484
 485         device_remove_file(&hid->dev, &dev_attr_range);
 486         dbg_hid("Device successfully unregistered\n");
 487         return 0;
 488 }