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