drivers/hid/hid-logitech-dj.c

   1 /*
   2  *  HID driver for Logitech Unifying receivers
   3  *
   4  *  Copyright (c) 2011 Logitech
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  *
  22  */
  23
  24
  25 #include <linux/device.h>
  26 #include <linux/hid.h>
  27 #include <linux/module.h>
  28 #include <linux/usb.h>
  29 #include <asm/unaligned.h>
  30 #include "hid-ids.h"
  31 #include "hid-logitech-dj.h"
  32
  33 /* Keyboard descriptor (1) */
  34 static const char kbd_descriptor[] = {
  35         0x05, 0x01,             /* USAGE_PAGE (generic Desktop)     */
  36         0x09, 0x06,             /* USAGE (Keyboard)         */
  37         0xA1, 0x01,             /* COLLECTION (Application)     */
  38         0x85, 0x01,             /* REPORT_ID (1)            */
  39         0x95, 0x08,             /*   REPORT_COUNT (8)           */
  40         0x75, 0x01,             /*   REPORT_SIZE (1)            */
  41         0x15, 0x00,             /*   LOGICAL_MINIMUM (0)        */
  42         0x25, 0x01,             /*   LOGICAL_MAXIMUM (1)        */
  43         0x05, 0x07,             /*   USAGE_PAGE (Keyboard)      */
  44         0x19, 0xE0,             /*   USAGE_MINIMUM (Left Control)   */
  45         0x29, 0xE7,             /*   USAGE_MAXIMUM (Right GUI)      */
  46         0x81, 0x02,             /*   INPUT (Data,Var,Abs)       */
  47         0x95, 0x05,             /*   REPORT COUNT (5)           */
  48         0x05, 0x08,             /*   USAGE PAGE (LED page)      */
  49         0x19, 0x01,             /*   USAGE MINIMUM (1)          */
  50         0x29, 0x05,             /*   USAGE MAXIMUM (5)          */
  51         0x91, 0x02,             /*   OUTPUT (Data, Variable, Absolute)  */
  52         0x95, 0x01,             /*   REPORT COUNT (1)           */
  53         0x75, 0x03,             /*   REPORT SIZE (3)            */
  54         0x91, 0x01,             /*   OUTPUT (Constant)          */
  55         0x95, 0x06,             /*   REPORT_COUNT (6)           */
  56         0x75, 0x08,             /*   REPORT_SIZE (8)            */
  57         0x15, 0x00,             /*   LOGICAL_MINIMUM (0)        */
  58         0x26, 0xFF, 0x00,       /*   LOGICAL_MAXIMUM (255)      */
  59         0x05, 0x07,             /*   USAGE_PAGE (Keyboard)      */
  60         0x19, 0x00,             /*   USAGE_MINIMUM (no event)       */
  61         0x2A, 0xFF, 0x00,       /*   USAGE_MAXIMUM (reserved)       */
  62         0x81, 0x00,             /*   INPUT (Data,Ary,Abs)       */
  63         0xC0
  64 };
  65
  66 /* Mouse descriptor (2)     */
  67 static const char mse_descriptor[] = {
  68         0x05, 0x01,             /*  USAGE_PAGE (Generic Desktop)        */
  69         0x09, 0x02,             /*  USAGE (Mouse)                       */
  70         0xA1, 0x01,             /*  COLLECTION (Application)            */
  71         0x85, 0x02,             /*    REPORT_ID = 2                     */
  72         0x09, 0x01,             /*    USAGE (pointer)                   */
  73         0xA1, 0x00,             /*    COLLECTION (physical)             */
  74         0x05, 0x09,             /*      USAGE_PAGE (buttons)            */
  75         0x19, 0x01,             /*      USAGE_MIN (1)                   */
  76         0x29, 0x10,             /*      USAGE_MAX (16)                  */
  77         0x15, 0x00,             /*      LOGICAL_MIN (0)                 */
  78         0x25, 0x01,             /*      LOGICAL_MAX (1)                 */
  79         0x95, 0x10,             /*      REPORT_COUNT (16)               */
  80         0x75, 0x01,             /*      REPORT_SIZE (1)                 */
  81         0x81, 0x02,             /*      INPUT (data var abs)            */
  82         0x05, 0x01,             /*      USAGE_PAGE (generic desktop)    */
  83         0x16, 0x01, 0xF8,       /*      LOGICAL_MIN (-2047)             */
  84         0x26, 0xFF, 0x07,       /*      LOGICAL_MAX (2047)              */
  85         0x75, 0x0C,             /*      REPORT_SIZE (12)                */
  86         0x95, 0x02,             /*      REPORT_COUNT (2)                */
  87         0x09, 0x30,             /*      USAGE (X)                       */
  88         0x09, 0x31,             /*      USAGE (Y)                       */
  89         0x81, 0x06,             /*      INPUT                           */
  90         0x15, 0x81,             /*      LOGICAL_MIN (-127)              */
  91         0x25, 0x7F,             /*      LOGICAL_MAX (127)               */
  92         0x75, 0x08,             /*      REPORT_SIZE (8)                 */
  93         0x95, 0x01,             /*      REPORT_COUNT (1)                */
  94         0x09, 0x38,             /*      USAGE (wheel)                   */
  95         0x81, 0x06,             /*      INPUT                           */
  96         0x05, 0x0C,             /*      USAGE_PAGE(consumer)            */
  97         0x0A, 0x38, 0x02,       /*      USAGE(AC Pan)                   */
  98         0x95, 0x01,             /*      REPORT_COUNT (1)                */
  99         0x81, 0x06,             /*      INPUT                           */
 100         0xC0,                   /*    END_COLLECTION                    */
 101         0xC0,                   /*  END_COLLECTION                      */
 102 };
 103
 104 /* Consumer Control descriptor (3) */
 105 static const char consumer_descriptor[] = {
 106         0x05, 0x0C,             /* USAGE_PAGE (Consumer Devices)       */
 107         0x09, 0x01,             /* USAGE (Consumer Control)            */
 108         0xA1, 0x01,             /* COLLECTION (Application)            */
 109         0x85, 0x03,             /* REPORT_ID = 3                       */
 110         0x75, 0x10,             /* REPORT_SIZE (16)                    */
 111         0x95, 0x02,             /* REPORT_COUNT (2)                    */
 112         0x15, 0x01,             /* LOGICAL_MIN (1)                     */
 113         0x26, 0x8C, 0x02,       /* LOGICAL_MAX (652)                   */
 114         0x19, 0x01,             /* USAGE_MIN (1)                       */
 115         0x2A, 0x8C, 0x02,       /* USAGE_MAX (652)                     */
 116         0x81, 0x00,             /* INPUT (Data Ary Abs)                */
 117         0xC0,                   /* END_COLLECTION                      */
 118 };                              /*                                     */
 119
 120 /* System control descriptor (4) */
 121 static const char syscontrol_descriptor[] = {
 122         0x05, 0x01,             /*   USAGE_PAGE (Generic Desktop)      */
 123         0x09, 0x80,             /*   USAGE (System Control)            */
 124         0xA1, 0x01,             /*   COLLECTION (Application)          */
 125         0x85, 0x04,             /*   REPORT_ID = 4                     */
 126         0x75, 0x02,             /*   REPORT_SIZE (2)                   */
 127         0x95, 0x01,             /*   REPORT_COUNT (1)                  */
 128         0x15, 0x01,             /*   LOGICAL_MIN (1)                   */
 129         0x25, 0x03,             /*   LOGICAL_MAX (3)                   */
 130         0x09, 0x82,             /*   USAGE (System Sleep)              */
 131         0x09, 0x81,             /*   USAGE (System Power Down)         */
 132         0x09, 0x83,             /*   USAGE (System Wake Up)            */
 133         0x81, 0x60,             /*   INPUT (Data Ary Abs NPrf Null)    */
 134         0x75, 0x06,             /*   REPORT_SIZE (6)                   */
 135         0x81, 0x03,             /*   INPUT (Cnst Var Abs)              */
 136         0xC0,                   /*   END_COLLECTION                    */
 137 };
 138
 139 /* Media descriptor (8) */
 140 static const char media_descriptor[] = {
 141         0x06, 0xbc, 0xff,       /* Usage Page 0xffbc                   */
 142         0x09, 0x88,             /* Usage 0x0088                        */
 143         0xa1, 0x01,             /* BeginCollection                     */
 144         0x85, 0x08,             /*   Report ID 8                       */
 145         0x19, 0x01,             /*   Usage Min 0x0001                  */
 146         0x29, 0xff,             /*   Usage Max 0x00ff                  */
 147         0x15, 0x01,             /*   Logical Min 1                     */
 148         0x26, 0xff, 0x00,       /*   Logical Max 255                   */
 149         0x75, 0x08,             /*   Report Size 8                     */
 150         0x95, 0x01,             /*   Report Count 1                    */
 151         0x81, 0x00,             /*   Input                             */
 152         0xc0,                   /* EndCollection                       */
 153 };                              /*                                     */
 154
 155 /* Maximum size of all defined hid reports in bytes (including report id) */
 156 #define MAX_REPORT_SIZE 8
 157
 158 /* Make sure all descriptors are present here */
 159 #define MAX_RDESC_SIZE                          \
 160         (sizeof(kbd_descriptor) +               \
 161          sizeof(mse_descriptor) +               \
 162          sizeof(consumer_descriptor) +          \
 163          sizeof(syscontrol_descriptor) +        \
 164          sizeof(media_descriptor))
 165
 166 /* Number of possible hid report types that can be created by this driver.
 167  *
 168  * Right now, RF report types have the same report types (or report id's)
 169  * than the hid report created from those RF reports. In the future
 170  * this doesnt have to be true.
 171  *
 172  * For instance, RF report type 0x01 which has a size of 8 bytes, corresponds
 173  * to hid report id 0x01, this is standard keyboard. Same thing applies to mice
 174  * reports and consumer control, etc. If a new RF report is created, it doesn't
 175  * has to have the same report id as its corresponding hid report, so an
 176  * translation may have to take place for future report types.
 177  */
 178 #define NUMBER_OF_HID_REPORTS 32
 179 static const u8 hid_reportid_size_map[NUMBER_OF_HID_REPORTS] = {
 180         [1] = 8,                /* Standard keyboard */
 181         [2] = 8,                /* Standard mouse */
 182         [3] = 5,                /* Consumer control */
 183         [4] = 2,                /* System control */
 184         [8] = 2,                /* Media Center */
 185 };
 186
 187
 188 #define LOGITECH_DJ_INTERFACE_NUMBER 0x02
 189
 190 static struct hid_ll_driver logi_dj_ll_driver;
 191
 192 static int logi_dj_output_hidraw_report(struct hid_device *hid, u8 * buf,
 193                                         size_t count,
 194                                         unsigned char report_type);
 195
 196 static void logi_dj_recv_destroy_djhid_device(struct dj_receiver_dev *djrcv_dev,
 197                                                 struct dj_report *dj_report)
 198 {
 199         /* Called in delayed work context */
 200         struct dj_device *dj_dev;
 201         unsigned long flags;
 202
 203         spin_lock_irqsave(&djrcv_dev->lock, flags);
 204         dj_dev = djrcv_dev->paired_dj_devices[dj_report->device_index];
 205         djrcv_dev->paired_dj_devices[dj_report->device_index] = NULL;
 206         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 207
 208         if (dj_dev != NULL) {
 209                 hid_destroy_device(dj_dev->hdev);
 210                 kfree(dj_dev);
 211         } else {
 212                 dev_err(&djrcv_dev->hdev->dev, "%s: can't destroy a NULL device\n",
 213                         __func__);
 214         }
 215 }
 216
 217 static void logi_dj_recv_add_djhid_device(struct dj_receiver_dev *djrcv_dev,
 218                                           struct dj_report *dj_report)
 219 {
 220         /* Called in delayed work context */
 221         struct hid_device *djrcv_hdev = djrcv_dev->hdev;
 222         struct usb_interface *intf = to_usb_interface(djrcv_hdev->dev.parent);
 223         struct usb_device *usbdev = interface_to_usbdev(intf);
 224         struct hid_device *dj_hiddev;
 225         struct dj_device *dj_dev;
 226
 227         /* Device index goes from 1 to 6, we need 3 bytes to store the
 228          * semicolon, the index, and a null terminator
 229          */
 230         unsigned char tmpstr[3];
 231
 232         if (dj_report->report_params[DEVICE_PAIRED_PARAM_SPFUNCTION] &
 233             SPFUNCTION_DEVICE_LIST_EMPTY) {
 234                 dbg_hid("%s: device list is empty\n", __func__);
 235                 return;
 236         }
 237
 238         if ((dj_report->device_index < DJ_DEVICE_INDEX_MIN) ||
 239             (dj_report->device_index > DJ_DEVICE_INDEX_MAX)) {
 240                 dev_err(&djrcv_hdev->dev, "%s: invalid device index:%d\n",
 241                         __func__, dj_report->device_index);
 242                 return;
 243         }
 244
 245         dj_hiddev = hid_allocate_device();
 246         if (IS_ERR(dj_hiddev)) {
 247                 dev_err(&djrcv_hdev->dev, "%s: hid_allocate_device failed\n",
 248                         __func__);
 249                 return;
 250         }
 251
 252         dj_hiddev->ll_driver = &logi_dj_ll_driver;
 253         dj_hiddev->hid_output_raw_report = logi_dj_output_hidraw_report;
 254
 255         dj_hiddev->dev.parent = &djrcv_hdev->dev;
 256         dj_hiddev->bus = BUS_USB;
 257         dj_hiddev->vendor = le16_to_cpu(usbdev->descriptor.idVendor);
 258         dj_hiddev->product = le16_to_cpu(usbdev->descriptor.idProduct);
 259         snprintf(dj_hiddev->name, sizeof(dj_hiddev->name),
 260                 "Logitech Unifying Device. Wireless PID:%02x%02x",
 261                 dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_MSB],
 262                 dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_LSB]);
 263
 264         usb_make_path(usbdev, dj_hiddev->phys, sizeof(dj_hiddev->phys));
 265         snprintf(tmpstr, sizeof(tmpstr), ":%d", dj_report->device_index);
 266         strlcat(dj_hiddev->phys, tmpstr, sizeof(dj_hiddev->phys));
 267
 268         dj_dev = kzalloc(sizeof(struct dj_device), GFP_KERNEL);
 269
 270         if (!dj_dev) {
 271                 dev_err(&djrcv_hdev->dev, "%s: failed allocating dj_device\n",
 272                         __func__);
 273                 goto dj_device_allocate_fail;
 274         }
 275
 276         dj_dev->reports_supported = get_unaligned_le32(
 277                 dj_report->report_params + DEVICE_PAIRED_RF_REPORT_TYPE);
 278         dj_dev->hdev = dj_hiddev;
 279         dj_dev->dj_receiver_dev = djrcv_dev;
 280         dj_dev->device_index = dj_report->device_index;
 281         dj_hiddev->driver_data = dj_dev;
 282
 283         djrcv_dev->paired_dj_devices[dj_report->device_index] = dj_dev;
 284
 285         if (hid_add_device(dj_hiddev)) {
 286                 dev_err(&djrcv_hdev->dev, "%s: failed adding dj_device\n",
 287                         __func__);
 288                 goto hid_add_device_fail;
 289         }
 290
 291         return;
 292
 293 hid_add_device_fail:
 294         djrcv_dev->paired_dj_devices[dj_report->device_index] = NULL;
 295         kfree(dj_dev);
 296 dj_device_allocate_fail:
 297         hid_destroy_device(dj_hiddev);
 298 }
 299
 300 static void delayedwork_callback(struct work_struct *work)
 301 {
 302         struct dj_receiver_dev *djrcv_dev =
 303                 container_of(work, struct dj_receiver_dev, work);
 304
 305         struct dj_report dj_report;
 306         unsigned long flags;
 307         int count;
 308
 309         dbg_hid("%s\n", __func__);
 310
 311         spin_lock_irqsave(&djrcv_dev->lock, flags);
 312
 313         count = kfifo_out(&djrcv_dev->notif_fifo, &dj_report,
 314                                 sizeof(struct dj_report));
 315
 316         if (count != sizeof(struct dj_report)) {
 317                 dev_err(&djrcv_dev->hdev->dev, "%s: workitem triggered without "
 318                         "notifications available\n", __func__);
 319                 spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 320                 return;
 321         }
 322
 323         if (!kfifo_is_empty(&djrcv_dev->notif_fifo)) {
 324                 if (schedule_work(&djrcv_dev->work) == 0) {
 325                         dbg_hid("%s: did not schedule the work item, was "
 326                                 "already queued\n", __func__);
 327                 }
 328         }
 329
 330         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 331
 332         switch (dj_report.report_type) {
 333         case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
 334                 logi_dj_recv_add_djhid_device(djrcv_dev, &dj_report);
 335                 break;
 336         case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
 337                 logi_dj_recv_destroy_djhid_device(djrcv_dev, &dj_report);
 338                 break;
 339         default:
 340                 dbg_hid("%s: unexpected report type\n", __func__);
 341         }
 342 }
 343
 344 static void logi_dj_recv_queue_notification(struct dj_receiver_dev *djrcv_dev,
 345                                            struct dj_report *dj_report)
 346 {
 347         /* We are called from atomic context (tasklet && djrcv->lock held) */
 348
 349         kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));
 350
 351         if (schedule_work(&djrcv_dev->work) == 0) {
 352                 dbg_hid("%s: did not schedule the work item, was already "
 353                         "queued\n", __func__);
 354         }
 355 }
 356
 357 static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev,
 358                                              struct dj_report *dj_report)
 359 {
 360         /* We are called from atomic context (tasklet && djrcv->lock held) */
 361         unsigned int i;
 362         u8 reportbuffer[MAX_REPORT_SIZE];
 363         struct dj_device *djdev;
 364
 365         djdev = djrcv_dev->paired_dj_devices[dj_report->device_index];
 366
 367         if (!djdev) {
 368                 dbg_hid("djrcv_dev->paired_dj_devices[dj_report->device_index]"
 369                         " is NULL, index %d\n", dj_report->device_index);
 370                 return;
 371         }
 372
 373         memset(reportbuffer, 0, sizeof(reportbuffer));
 374
 375         for (i = 0; i < NUMBER_OF_HID_REPORTS; i++) {
 376                 if (djdev->reports_supported & (1 << i)) {
 377                         reportbuffer[0] = i;
 378                         if (hid_input_report(djdev->hdev,
 379                                              HID_INPUT_REPORT,
 380                                              reportbuffer,
 381                                              hid_reportid_size_map[i], 1)) {
 382                                 dbg_hid("hid_input_report error sending null "
 383                                         "report\n");
 384                         }
 385                 }
 386         }
 387 }
 388
 389 static void logi_dj_recv_forward_report(struct dj_receiver_dev *djrcv_dev,
 390                                         struct dj_report *dj_report)
 391 {
 392         /* We are called from atomic context (tasklet && djrcv->lock held) */
 393         struct dj_device *dj_device;
 394
 395         dj_device = djrcv_dev->paired_dj_devices[dj_report->device_index];
 396
 397         if (dj_device == NULL) {
 398                 dbg_hid("djrcv_dev->paired_dj_devices[dj_report->device_index]"
 399                         " is NULL, index %d\n", dj_report->device_index);
 400                 return;
 401         }
 402
 403         if ((dj_report->report_type > ARRAY_SIZE(hid_reportid_size_map) - 1) ||
 404             (hid_reportid_size_map[dj_report->report_type] == 0)) {
 405                 dbg_hid("invalid report type:%x\n", dj_report->report_type);
 406                 return;
 407         }
 408
 409         if (hid_input_report(dj_device->hdev,
 410                         HID_INPUT_REPORT, &dj_report->report_type,
 411                         hid_reportid_size_map[dj_report->report_type], 1)) {
 412                 dbg_hid("hid_input_report error\n");
 413         }
 414 }
 415
 416
 417 static int logi_dj_recv_send_report(struct dj_receiver_dev *djrcv_dev,
 418                                     struct dj_report *dj_report)
 419 {
 420         struct hid_device *hdev = djrcv_dev->hdev;
 421         struct hid_report *report;
 422         struct hid_report_enum *output_report_enum;
 423         u8 *data = (u8 *)(&dj_report->device_index);
 424         unsigned int i;
 425
 426         output_report_enum = &hdev->report_enum[HID_OUTPUT_REPORT];
 427         report = output_report_enum->report_id_hash[REPORT_ID_DJ_SHORT];
 428
 429         if (!report) {
 430                 dev_err(&hdev->dev, "%s: unable to find dj report\n", __func__);
 431                 return -ENODEV;
 432         }
 433
 434         for (i = 0; i < DJREPORT_SHORT_LENGTH - 1; i++)
 435                 report->field[0]->value[i] = data[i];
 436
 437         hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
 438
 439         return 0;
 440 }
 441
 442 static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev)
 443 {
 444         struct dj_report *dj_report;
 445         int retval;
 446
 447         dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
 448         if (!dj_report)
 449                 return -ENOMEM;
 450         dj_report->report_id = REPORT_ID_DJ_SHORT;
 451         dj_report->device_index = 0xFF;
 452         dj_report->report_type = REPORT_TYPE_CMD_GET_PAIRED_DEVICES;
 453         retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
 454         kfree(dj_report);
 455         return retval;
 456 }
 457
 458 static int logi_dj_recv_switch_to_dj_mode(struct dj_receiver_dev *djrcv_dev,
 459                                           unsigned timeout)
 460 {
 461         struct dj_report *dj_report;
 462         int retval;
 463
 464         dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
 465         if (!dj_report)
 466                 return -ENOMEM;
 467         dj_report->report_id = REPORT_ID_DJ_SHORT;
 468         dj_report->device_index = 0xFF;
 469         dj_report->report_type = REPORT_TYPE_CMD_SWITCH;
 470         dj_report->report_params[CMD_SWITCH_PARAM_DEVBITFIELD] = 0x3F;
 471         dj_report->report_params[CMD_SWITCH_PARAM_TIMEOUT_SECONDS] = (u8)timeout;
 472         retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
 473         kfree(dj_report);
 474         return retval;
 475 }
 476
 477
 478 static int logi_dj_ll_open(struct hid_device *hid)
 479 {
 480         dbg_hid("%s:%s\n", __func__, hid->phys);
 481         return 0;
 482
 483 }
 484
 485 static void logi_dj_ll_close(struct hid_device *hid)
 486 {
 487         dbg_hid("%s:%s\n", __func__, hid->phys);
 488 }
 489
 490 static int logi_dj_output_hidraw_report(struct hid_device *hid, u8 * buf,
 491                                         size_t count,
 492                                         unsigned char report_type)
 493 {
 494         /* Called by hid raw to send data */
 495         dbg_hid("%s\n", __func__);
 496
 497         return 0;
 498 }
 499
 500 static void rdcat(char **rdesc, unsigned int *rsize, const char *data, unsigned int size)
 501 {
 502         memcpy(*rdesc + *rsize, data, size);
 503         *rsize += size;
 504 }
 505
 506 static int logi_dj_ll_parse(struct hid_device *hid)
 507 {
 508         struct dj_device *djdev = hid->driver_data;
 509         unsigned int rsize = 0;
 510         char *rdesc;
 511         int retval;
 512
 513         dbg_hid("%s\n", __func__);
 514
 515         djdev->hdev->version = 0x0111;
 516         djdev->hdev->country = 0x00;
 517
 518         rdesc = kmalloc(MAX_RDESC_SIZE, GFP_KERNEL);
 519         if (!rdesc)
 520                 return -ENOMEM;
 521
 522         if (djdev->reports_supported & STD_KEYBOARD) {
 523                 dbg_hid("%s: sending a kbd descriptor, reports_supported: %x\n",
 524                         __func__, djdev->reports_supported);
 525                 rdcat(&rdesc, &rsize, kbd_descriptor, sizeof(kbd_descriptor));
 526         }
 527
 528         if (djdev->reports_supported & STD_MOUSE) {
 529                 dbg_hid("%s: sending a mouse descriptor, reports_supported: "
 530                         "%x\n", __func__, djdev->reports_supported);
 531                 rdcat(&rdesc, &rsize, mse_descriptor, sizeof(mse_descriptor));
 532         }
 533
 534         if (djdev->reports_supported & MULTIMEDIA) {
 535                 dbg_hid("%s: sending a multimedia report descriptor: %x\n",
 536                         __func__, djdev->reports_supported);
 537                 rdcat(&rdesc, &rsize, consumer_descriptor, sizeof(consumer_descriptor));
 538         }
 539
 540         if (djdev->reports_supported & POWER_KEYS) {
 541                 dbg_hid("%s: sending a power keys report descriptor: %x\n",
 542                         __func__, djdev->reports_supported);
 543                 rdcat(&rdesc, &rsize, syscontrol_descriptor, sizeof(syscontrol_descriptor));
 544         }
 545
 546         if (djdev->reports_supported & MEDIA_CENTER) {
 547                 dbg_hid("%s: sending a media center report descriptor: %x\n",
 548                         __func__, djdev->reports_supported);
 549                 rdcat(&rdesc, &rsize, media_descriptor, sizeof(media_descriptor));
 550         }
 551
 552         if (djdev->reports_supported & KBD_LEDS) {
 553                 dbg_hid("%s: need to send kbd leds report descriptor: %x\n",
 554                         __func__, djdev->reports_supported);
 555         }
 556
 557         retval = hid_parse_report(hid, rdesc, rsize);
 558         kfree(rdesc);
 559
 560         return retval;
 561 }
 562
 563 static int logi_dj_ll_input_event(struct input_dev *dev, unsigned int type,
 564                                   unsigned int code, int value)
 565 {
 566         /* Sent by the input layer to handle leds and Force Feedback */
 567         struct hid_device *dj_hiddev = input_get_drvdata(dev);
 568         struct dj_device *dj_dev = dj_hiddev->driver_data;
 569
 570         struct dj_receiver_dev *djrcv_dev =
 571             dev_get_drvdata(dj_hiddev->dev.parent);
 572         struct hid_device *dj_rcv_hiddev = djrcv_dev->hdev;
 573         struct hid_report_enum *output_report_enum;
 574
 575         struct hid_field *field;
 576         struct hid_report *report;
 577         unsigned char *data;
 578         int offset;
 579
 580         dbg_hid("%s: %s, type:%d | code:%d | value:%d\n",
 581                 __func__, dev->phys, type, code, value);
 582
 583         if (type != EV_LED)
 584                 return -1;
 585
 586         offset = hidinput_find_field(dj_hiddev, type, code, &field);
 587
 588         if (offset == -1) {
 589                 dev_warn(&dev->dev, "event field not found\n");
 590                 return -1;
 591         }
 592         hid_set_field(field, offset, value);
 593
 594         data = hid_alloc_report_buf(field->report, GFP_KERNEL);
 595         if (!data) {
 596                 dev_warn(&dev->dev, "failed to allocate report buf memory\n");
 597                 return -1;
 598         }
 599
 600         hid_output_report(field->report, &data[0]);
 601
 602         output_report_enum = &dj_rcv_hiddev->report_enum[HID_OUTPUT_REPORT];
 603         report = output_report_enum->report_id_hash[REPORT_ID_DJ_SHORT];
 604         hid_set_field(report->field[0], 0, dj_dev->device_index);
 605         hid_set_field(report->field[0], 1, REPORT_TYPE_LEDS);
 606         hid_set_field(report->field[0], 2, data[1]);
 607
 608         hid_hw_request(dj_rcv_hiddev, report, HID_REQ_SET_REPORT);
 609
 610         kfree(data);
 611
 612         return 0;
 613 }
 614
 615 static int logi_dj_ll_start(struct hid_device *hid)
 616 {
 617         dbg_hid("%s\n", __func__);
 618         return 0;
 619 }
 620
 621 static void logi_dj_ll_stop(struct hid_device *hid)
 622 {
 623         dbg_hid("%s\n", __func__);
 624 }
 625
 626
 627 static struct hid_ll_driver logi_dj_ll_driver = {
 628         .parse = logi_dj_ll_parse,
 629         .start = logi_dj_ll_start,
 630         .stop = logi_dj_ll_stop,
 631         .open = logi_dj_ll_open,
 632         .close = logi_dj_ll_close,
 633         .hidinput_input_event = logi_dj_ll_input_event,
 634 };
 635
 636
 637 static int logi_dj_raw_event(struct hid_device *hdev,
 638                              struct hid_report *report, u8 *data,
 639                              int size)
 640 {
 641         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
 642         struct dj_report *dj_report = (struct dj_report *) data;
 643         unsigned long flags;
 644         bool report_processed = false;
 645
 646         dbg_hid("%s, size:%d\n", __func__, size);
 647
 648         /* Here we receive all data coming from iface 2, there are 4 cases:
 649          *
 650          * 1) Data should continue its normal processing i.e. data does not
 651          * come from the DJ collection, in which case we do nothing and
 652          * return 0, so hid-core can continue normal processing (will forward
 653          * to associated hidraw device)
 654          *
 655          * 2) Data is from DJ collection, and is intended for this driver i. e.
 656          * data contains arrival, departure, etc notifications, in which case
 657          * we queue them for delayed processing by the work queue. We return 1
 658          * to hid-core as no further processing is required from it.
 659          *
 660          * 3) Data is from DJ collection, and informs a connection change,
 661          * if the change means rf link loss, then we must send a null report
 662          * to the upper layer to discard potentially pressed keys that may be
 663          * repeated forever by the input layer. Return 1 to hid-core as no
 664          * further processing is required.
 665          *
 666          * 4) Data is from DJ collection and is an actual input event from
 667          * a paired DJ device in which case we forward it to the correct hid
 668          * device (via hid_input_report() ) and return 1 so hid-core does not do
 669          * anything else with it.
 670          */
 671
 672         spin_lock_irqsave(&djrcv_dev->lock, flags);
 673         if (dj_report->report_id == REPORT_ID_DJ_SHORT) {
 674                 switch (dj_report->report_type) {
 675                 case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
 676                 case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
 677                         logi_dj_recv_queue_notification(djrcv_dev, dj_report);
 678                         break;
 679                 case REPORT_TYPE_NOTIF_CONNECTION_STATUS:
 680                         if (dj_report->report_params[CONNECTION_STATUS_PARAM_STATUS] ==
 681                             STATUS_LINKLOSS) {
 682                                 logi_dj_recv_forward_null_report(djrcv_dev, dj_report);
 683                         }
 684                         break;
 685                 default:
 686                         logi_dj_recv_forward_report(djrcv_dev, dj_report);
 687                 }
 688                 report_processed = true;
 689         }
 690         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 691
 692         return report_processed;
 693 }
 694
 695 static int logi_dj_probe(struct hid_device *hdev,
 696                          const struct hid_device_id *id)
 697 {
 698         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 699         struct dj_receiver_dev *djrcv_dev;
 700         int retval;
 701
 702         if (is_dj_device((struct dj_device *)hdev->driver_data))
 703                 return -ENODEV;
 704
 705         dbg_hid("%s called for ifnum %d\n", __func__,
 706                 intf->cur_altsetting->desc.bInterfaceNumber);
 707
 708         /* Ignore interfaces 0 and 1, they will not carry any data, dont create
 709          * any hid_device for them */
 710         if (intf->cur_altsetting->desc.bInterfaceNumber !=
 711             LOGITECH_DJ_INTERFACE_NUMBER) {
 712                 dbg_hid("%s: ignoring ifnum %d\n", __func__,
 713                         intf->cur_altsetting->desc.bInterfaceNumber);
 714                 return -ENODEV;
 715         }
 716
 717         /* Treat interface 2 */
 718
 719         djrcv_dev = kzalloc(sizeof(struct dj_receiver_dev), GFP_KERNEL);
 720         if (!djrcv_dev) {
 721                 dev_err(&hdev->dev,
 722                         "%s:failed allocating dj_receiver_dev\n", __func__);
 723                 return -ENOMEM;
 724         }
 725         djrcv_dev->hdev = hdev;
 726         INIT_WORK(&djrcv_dev->work, delayedwork_callback);
 727         spin_lock_init(&djrcv_dev->lock);
 728         if (kfifo_alloc(&djrcv_dev->notif_fifo,
 729                         DJ_MAX_NUMBER_NOTIFICATIONS * sizeof(struct dj_report),
 730                         GFP_KERNEL)) {
 731                 dev_err(&hdev->dev,
 732                         "%s:failed allocating notif_fifo\n", __func__);
 733                 kfree(djrcv_dev);
 734                 return -ENOMEM;
 735         }
 736         hid_set_drvdata(hdev, djrcv_dev);
 737
 738         /* Call  to usbhid to fetch the HID descriptors of interface 2 and
 739          * subsequently call to the hid/hid-core to parse the fetched
 740          * descriptors, this will in turn create the hidraw and hiddev nodes
 741          * for interface 2 of the receiver */
 742         retval = hid_parse(hdev);
 743         if (retval) {
 744                 dev_err(&hdev->dev,
 745                         "%s:parse of interface 2 failed\n", __func__);
 746                 goto hid_parse_fail;
 747         }
 748
 749         if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, REPORT_ID_DJ_SHORT,
 750                                  0, DJREPORT_SHORT_LENGTH - 1)) {
 751                 retval = -ENODEV;
 752                 goto hid_parse_fail;
 753         }
 754
 755         /* Starts the usb device and connects to upper interfaces hiddev and
 756          * hidraw */
 757         retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 758         if (retval) {
 759                 dev_err(&hdev->dev,
 760                         "%s:hid_hw_start returned error\n", __func__);
 761                 goto hid_hw_start_fail;
 762         }
 763
 764         retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
 765         if (retval < 0) {
 766                 dev_err(&hdev->dev,
 767                         "%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
 768                         __func__, retval);
 769                 goto switch_to_dj_mode_fail;
 770         }
 771
 772         /* This is enabling the polling urb on the IN endpoint */
 773         retval = hdev->ll_driver->open(hdev);
 774         if (retval < 0) {
 775                 dev_err(&hdev->dev, "%s:hdev->ll_driver->open returned "
 776                         "error:%d\n", __func__, retval);
 777                 goto llopen_failed;
 778         }
 779
 780         /* Allow incoming packets to arrive: */
 781         hid_device_io_start(hdev);
 782
 783         retval = logi_dj_recv_query_paired_devices(djrcv_dev);
 784         if (retval < 0) {
 785                 dev_err(&hdev->dev, "%s:logi_dj_recv_query_paired_devices "
 786                         "error:%d\n", __func__, retval);
 787                 goto logi_dj_recv_query_paired_devices_failed;
 788         }
 789
 790         return retval;
 791
 792 logi_dj_recv_query_paired_devices_failed:
 793         hdev->ll_driver->close(hdev);
 794
 795 llopen_failed:
 796 switch_to_dj_mode_fail:
 797         hid_hw_stop(hdev);
 798
 799 hid_hw_start_fail:
 800 hid_parse_fail:
 801         kfifo_free(&djrcv_dev->notif_fifo);
 802         kfree(djrcv_dev);
 803         hid_set_drvdata(hdev, NULL);
 804         return retval;
 805
 806 }
 807
 808 #ifdef CONFIG_PM
 809 static int logi_dj_reset_resume(struct hid_device *hdev)
 810 {
 811         int retval;
 812         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
 813
 814         retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
 815         if (retval < 0) {
 816                 dev_err(&hdev->dev,
 817                         "%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
 818                         __func__, retval);
 819         }
 820
 821         return 0;
 822 }
 823 #endif
 824
 825 static void logi_dj_remove(struct hid_device *hdev)
 826 {
 827         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
 828         struct dj_device *dj_dev;
 829         int i;
 830
 831         dbg_hid("%s\n", __func__);
 832
 833         cancel_work_sync(&djrcv_dev->work);
 834
 835         hdev->ll_driver->close(hdev);
 836         hid_hw_stop(hdev);
 837
 838         /* I suppose that at this point the only context that can access
 839          * the djrecv_data is this thread as the work item is guaranteed to
 840          * have finished and no more raw_event callbacks should arrive after
 841          * the remove callback was triggered so no locks are put around the
 842          * code below */
 843         for (i = 0; i < (DJ_MAX_PAIRED_DEVICES + DJ_DEVICE_INDEX_MIN); i++) {
 844                 dj_dev = djrcv_dev->paired_dj_devices[i];
 845                 if (dj_dev != NULL) {
 846                         hid_destroy_device(dj_dev->hdev);
 847                         kfree(dj_dev);
 848                         djrcv_dev->paired_dj_devices[i] = NULL;
 849                 }
 850         }
 851
 852         kfifo_free(&djrcv_dev->notif_fifo);
 853         kfree(djrcv_dev);
 854         hid_set_drvdata(hdev, NULL);
 855 }
 856
 857 static int logi_djdevice_probe(struct hid_device *hdev,
 858                          const struct hid_device_id *id)
 859 {
 860         int ret;
 861         struct dj_device *dj_dev = hdev->driver_data;
 862
 863         if (!is_dj_device(dj_dev))
 864                 return -ENODEV;
 865
 866         ret = hid_parse(hdev);
 867         if (!ret)
 868                 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 869
 870         return ret;
 871 }
 872
 873 static const struct hid_device_id logi_dj_receivers[] = {
 874         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 875                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
 876         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 877                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
 878         {}
 879 };
 880
 881 MODULE_DEVICE_TABLE(hid, logi_dj_receivers);
 882
 883 static struct hid_driver logi_djreceiver_driver = {
 884         .name = "logitech-djreceiver",
 885         .id_table = logi_dj_receivers,
 886         .probe = logi_dj_probe,
 887         .remove = logi_dj_remove,
 888         .raw_event = logi_dj_raw_event,
 889 #ifdef CONFIG_PM
 890         .reset_resume = logi_dj_reset_resume,
 891 #endif
 892 };
 893
 894
 895 static const struct hid_device_id logi_dj_devices[] = {
 896         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 897                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
 898         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 899                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
 900         {}
 901 };
 902
 903 static struct hid_driver logi_djdevice_driver = {
 904         .name = "logitech-djdevice",
 905         .id_table = logi_dj_devices,
 906         .probe = logi_djdevice_probe,
 907 };
 908
 909
 910 static int __init logi_dj_init(void)
 911 {
 912         int retval;
 913
 914         dbg_hid("Logitech-DJ:%s\n", __func__);
 915
 916         retval = hid_register_driver(&logi_djreceiver_driver);
 917         if (retval)
 918                 return retval;
 919
 920         retval = hid_register_driver(&logi_djdevice_driver);
 921         if (retval)
 922                 hid_unregister_driver(&logi_djreceiver_driver);
 923
 924         return retval;
 925
 926 }
 927
 928 static void __exit logi_dj_exit(void)
 929 {
 930         dbg_hid("Logitech-DJ:%s\n", __func__);
 931
 932         hid_unregister_driver(&logi_djdevice_driver);
 933         hid_unregister_driver(&logi_djreceiver_driver);
 934
 935 }
 936
 937 module_init(logi_dj_init);
 938 module_exit(logi_dj_exit);
 939 MODULE_LICENSE("GPL");
 940 MODULE_AUTHOR("Logitech");
 941 MODULE_AUTHOR("Nestor Lopez Casado");
 942 MODULE_AUTHOR("nlopezcasad@logitech.com");