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, 0x06,             /*   REPORT_COUNT (6)           */
  48         0x75, 0x08,             /*   REPORT_SIZE (8)            */
  49         0x15, 0x00,             /*   LOGICAL_MINIMUM (0)        */
  50         0x26, 0xFF, 0x00,       /*   LOGICAL_MAXIMUM (255)      */
  51         0x05, 0x07,             /*   USAGE_PAGE (Keyboard)      */
  52         0x19, 0x00,             /*   USAGE_MINIMUM (no event)       */
  53         0x2A, 0xFF, 0x00,       /*   USAGE_MAXIMUM (reserved)       */
  54         0x81, 0x00,             /*   INPUT (Data,Ary,Abs)       */
  55         0x85, 0x0e,             /* REPORT_ID (14)               */
  56         0x05, 0x08,             /*   USAGE PAGE (LED page)      */
  57         0x95, 0x05,             /*   REPORT COUNT (5)           */
  58         0x75, 0x01,             /*   REPORT SIZE (1)            */
  59         0x15, 0x00,             /*   LOGICAL_MINIMUM (0)        */
  60         0x25, 0x01,             /*   LOGICAL_MAXIMUM (1)        */
  61         0x19, 0x01,             /*   USAGE MINIMUM (1)          */
  62         0x29, 0x05,             /*   USAGE MAXIMUM (5)          */
  63         0x91, 0x02,             /*   OUTPUT (Data, Variable, Absolute)  */
  64         0x95, 0x01,             /*   REPORT COUNT (1)           */
  65         0x75, 0x03,             /*   REPORT SIZE (3)            */
  66         0x91, 0x01,             /*   OUTPUT (Constant)          */
  67         0xC0
  68 };
  69
  70 /* Mouse descriptor (2)     */
  71 static const char mse_descriptor[] = {
  72         0x05, 0x01,             /*  USAGE_PAGE (Generic Desktop)        */
  73         0x09, 0x02,             /*  USAGE (Mouse)                       */
  74         0xA1, 0x01,             /*  COLLECTION (Application)            */
  75         0x85, 0x02,             /*    REPORT_ID = 2                     */
  76         0x09, 0x01,             /*    USAGE (pointer)                   */
  77         0xA1, 0x00,             /*    COLLECTION (physical)             */
  78         0x05, 0x09,             /*      USAGE_PAGE (buttons)            */
  79         0x19, 0x01,             /*      USAGE_MIN (1)                   */
  80         0x29, 0x10,             /*      USAGE_MAX (16)                  */
  81         0x15, 0x00,             /*      LOGICAL_MIN (0)                 */
  82         0x25, 0x01,             /*      LOGICAL_MAX (1)                 */
  83         0x95, 0x10,             /*      REPORT_COUNT (16)               */
  84         0x75, 0x01,             /*      REPORT_SIZE (1)                 */
  85         0x81, 0x02,             /*      INPUT (data var abs)            */
  86         0x05, 0x01,             /*      USAGE_PAGE (generic desktop)    */
  87         0x16, 0x01, 0xF8,       /*      LOGICAL_MIN (-2047)             */
  88         0x26, 0xFF, 0x07,       /*      LOGICAL_MAX (2047)              */
  89         0x75, 0x0C,             /*      REPORT_SIZE (12)                */
  90         0x95, 0x02,             /*      REPORT_COUNT (2)                */
  91         0x09, 0x30,             /*      USAGE (X)                       */
  92         0x09, 0x31,             /*      USAGE (Y)                       */
  93         0x81, 0x06,             /*      INPUT                           */
  94         0x15, 0x81,             /*      LOGICAL_MIN (-127)              */
  95         0x25, 0x7F,             /*      LOGICAL_MAX (127)               */
  96         0x75, 0x08,             /*      REPORT_SIZE (8)                 */
  97         0x95, 0x01,             /*      REPORT_COUNT (1)                */
  98         0x09, 0x38,             /*      USAGE (wheel)                   */
  99         0x81, 0x06,             /*      INPUT                           */
 100         0x05, 0x0C,             /*      USAGE_PAGE(consumer)            */
 101         0x0A, 0x38, 0x02,       /*      USAGE(AC Pan)                   */
 102         0x95, 0x01,             /*      REPORT_COUNT (1)                */
 103         0x81, 0x06,             /*      INPUT                           */
 104         0xC0,                   /*    END_COLLECTION                    */
 105         0xC0,                   /*  END_COLLECTION                      */
 106 };
 107
 108 /* Consumer Control descriptor (3) */
 109 static const char consumer_descriptor[] = {
 110         0x05, 0x0C,             /* USAGE_PAGE (Consumer Devices)       */
 111         0x09, 0x01,             /* USAGE (Consumer Control)            */
 112         0xA1, 0x01,             /* COLLECTION (Application)            */
 113         0x85, 0x03,             /* REPORT_ID = 3                       */
 114         0x75, 0x10,             /* REPORT_SIZE (16)                    */
 115         0x95, 0x02,             /* REPORT_COUNT (2)                    */
 116         0x15, 0x01,             /* LOGICAL_MIN (1)                     */
 117         0x26, 0x8C, 0x02,       /* LOGICAL_MAX (652)                   */
 118         0x19, 0x01,             /* USAGE_MIN (1)                       */
 119         0x2A, 0x8C, 0x02,       /* USAGE_MAX (652)                     */
 120         0x81, 0x00,             /* INPUT (Data Ary Abs)                */
 121         0xC0,                   /* END_COLLECTION                      */
 122 };                              /*                                     */
 123
 124 /* System control descriptor (4) */
 125 static const char syscontrol_descriptor[] = {
 126         0x05, 0x01,             /*   USAGE_PAGE (Generic Desktop)      */
 127         0x09, 0x80,             /*   USAGE (System Control)            */
 128         0xA1, 0x01,             /*   COLLECTION (Application)          */
 129         0x85, 0x04,             /*   REPORT_ID = 4                     */
 130         0x75, 0x02,             /*   REPORT_SIZE (2)                   */
 131         0x95, 0x01,             /*   REPORT_COUNT (1)                  */
 132         0x15, 0x01,             /*   LOGICAL_MIN (1)                   */
 133         0x25, 0x03,             /*   LOGICAL_MAX (3)                   */
 134         0x09, 0x82,             /*   USAGE (System Sleep)              */
 135         0x09, 0x81,             /*   USAGE (System Power Down)         */
 136         0x09, 0x83,             /*   USAGE (System Wake Up)            */
 137         0x81, 0x60,             /*   INPUT (Data Ary Abs NPrf Null)    */
 138         0x75, 0x06,             /*   REPORT_SIZE (6)                   */
 139         0x81, 0x03,             /*   INPUT (Cnst Var Abs)              */
 140         0xC0,                   /*   END_COLLECTION                    */
 141 };
 142
 143 /* Media descriptor (8) */
 144 static const char media_descriptor[] = {
 145         0x06, 0xbc, 0xff,       /* Usage Page 0xffbc                   */
 146         0x09, 0x88,             /* Usage 0x0088                        */
 147         0xa1, 0x01,             /* BeginCollection                     */
 148         0x85, 0x08,             /*   Report ID 8                       */
 149         0x19, 0x01,             /*   Usage Min 0x0001                  */
 150         0x29, 0xff,             /*   Usage Max 0x00ff                  */
 151         0x15, 0x01,             /*   Logical Min 1                     */
 152         0x26, 0xff, 0x00,       /*   Logical Max 255                   */
 153         0x75, 0x08,             /*   Report Size 8                     */
 154         0x95, 0x01,             /*   Report Count 1                    */
 155         0x81, 0x00,             /*   Input                             */
 156         0xc0,                   /* EndCollection                       */
 157 };                              /*                                     */
 158
 159 /* Maximum size of all defined hid reports in bytes (including report id) */
 160 #define MAX_REPORT_SIZE 8
 161
 162 /* Make sure all descriptors are present here */
 163 #define MAX_RDESC_SIZE                          \
 164         (sizeof(kbd_descriptor) +               \
 165          sizeof(mse_descriptor) +               \
 166          sizeof(consumer_descriptor) +          \
 167          sizeof(syscontrol_descriptor) +        \
 168          sizeof(media_descriptor))
 169
 170 /* Number of possible hid report types that can be created by this driver.
 171  *
 172  * Right now, RF report types have the same report types (or report id's)
 173  * than the hid report created from those RF reports. In the future
 174  * this doesnt have to be true.
 175  *
 176  * For instance, RF report type 0x01 which has a size of 8 bytes, corresponds
 177  * to hid report id 0x01, this is standard keyboard. Same thing applies to mice
 178  * reports and consumer control, etc. If a new RF report is created, it doesn't
 179  * has to have the same report id as its corresponding hid report, so an
 180  * translation may have to take place for future report types.
 181  */
 182 #define NUMBER_OF_HID_REPORTS 32
 183 static const u8 hid_reportid_size_map[NUMBER_OF_HID_REPORTS] = {
 184         [1] = 8,                /* Standard keyboard */
 185         [2] = 8,                /* Standard mouse */
 186         [3] = 5,                /* Consumer control */
 187         [4] = 2,                /* System control */
 188         [8] = 2,                /* Media Center */
 189 };
 190
 191
 192 #define LOGITECH_DJ_INTERFACE_NUMBER 0x02
 193
 194 static struct hid_ll_driver logi_dj_ll_driver;
 195
 196 static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev);
 197
 198 static void logi_dj_recv_destroy_djhid_device(struct dj_receiver_dev *djrcv_dev,
 199                                                 struct dj_report *dj_report)
 200 {
 201         /* Called in delayed work context */
 202         struct dj_device *dj_dev;
 203         unsigned long flags;
 204
 205         spin_lock_irqsave(&djrcv_dev->lock, flags);
 206         dj_dev = djrcv_dev->paired_dj_devices[dj_report->device_index];
 207         djrcv_dev->paired_dj_devices[dj_report->device_index] = NULL;
 208         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 209
 210         if (dj_dev != NULL) {
 211                 hid_destroy_device(dj_dev->hdev);
 212                 kfree(dj_dev);
 213         } else {
 214                 dev_err(&djrcv_dev->hdev->dev, "%s: can't destroy a NULL device\n",
 215                         __func__);
 216         }
 217 }
 218
 219 static void logi_dj_recv_add_djhid_device(struct dj_receiver_dev *djrcv_dev,
 220                                           struct dj_report *dj_report)
 221 {
 222         /* Called in delayed work context */
 223         struct hid_device *djrcv_hdev = djrcv_dev->hdev;
 224         struct usb_interface *intf = to_usb_interface(djrcv_hdev->dev.parent);
 225         struct usb_device *usbdev = interface_to_usbdev(intf);
 226         struct hid_device *dj_hiddev;
 227         struct dj_device *dj_dev;
 228
 229         /* Device index goes from 1 to 6, we need 3 bytes to store the
 230          * semicolon, the index, and a null terminator
 231          */
 232         unsigned char tmpstr[3];
 233
 234         if (dj_report->report_params[DEVICE_PAIRED_PARAM_SPFUNCTION] &
 235             SPFUNCTION_DEVICE_LIST_EMPTY) {
 236                 dbg_hid("%s: device list is empty\n", __func__);
 237                 djrcv_dev->querying_devices = false;
 238                 return;
 239         }
 240
 241         if (djrcv_dev->paired_dj_devices[dj_report->device_index]) {
 242                 /* The device is already known. No need to reallocate it. */
 243                 dbg_hid("%s: device is already known\n", __func__);
 244                 return;
 245         }
 246
 247         dj_hiddev = hid_allocate_device();
 248         if (IS_ERR(dj_hiddev)) {
 249                 dev_err(&djrcv_hdev->dev, "%s: hid_allocate_device failed\n",
 250                         __func__);
 251                 return;
 252         }
 253
 254         dj_hiddev->ll_driver = &logi_dj_ll_driver;
 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         int retval;
 310
 311         dbg_hid("%s\n", __func__);
 312
 313         spin_lock_irqsave(&djrcv_dev->lock, flags);
 314
 315         count = kfifo_out(&djrcv_dev->notif_fifo, &dj_report,
 316                                 sizeof(struct dj_report));
 317
 318         if (count != sizeof(struct dj_report)) {
 319                 dev_err(&djrcv_dev->hdev->dev, "%s: workitem triggered without "
 320                         "notifications available\n", __func__);
 321                 spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 322                 return;
 323         }
 324
 325         if (!kfifo_is_empty(&djrcv_dev->notif_fifo)) {
 326                 if (schedule_work(&djrcv_dev->work) == 0) {
 327                         dbg_hid("%s: did not schedule the work item, was "
 328                                 "already queued\n", __func__);
 329                 }
 330         }
 331
 332         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 333
 334         switch (dj_report.report_type) {
 335         case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
 336                 logi_dj_recv_add_djhid_device(djrcv_dev, &dj_report);
 337                 break;
 338         case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
 339                 logi_dj_recv_destroy_djhid_device(djrcv_dev, &dj_report);
 340                 break;
 341         default:
 342         /* A normal report (i. e. not belonging to a pair/unpair notification)
 343          * arriving here, means that the report arrived but we did not have a
 344          * paired dj_device associated to the report's device_index, this
 345          * means that the original "device paired" notification corresponding
 346          * to this dj_device never arrived to this driver. The reason is that
 347          * hid-core discards all packets coming from a device while probe() is
 348          * executing. */
 349         if (!djrcv_dev->paired_dj_devices[dj_report.device_index]) {
 350                 /* ok, we don't know the device, just re-ask the
 351                  * receiver for the list of connected devices. */
 352                 retval = logi_dj_recv_query_paired_devices(djrcv_dev);
 353                 if (!retval) {
 354                         /* everything went fine, so just leave */
 355                         break;
 356                 }
 357                 dev_err(&djrcv_dev->hdev->dev,
 358                         "%s:logi_dj_recv_query_paired_devices "
 359                         "error:%d\n", __func__, retval);
 360                 }
 361                 dbg_hid("%s: unexpected report type\n", __func__);
 362         }
 363 }
 364
 365 static void logi_dj_recv_queue_notification(struct dj_receiver_dev *djrcv_dev,
 366                                            struct dj_report *dj_report)
 367 {
 368         /* We are called from atomic context (tasklet && djrcv->lock held) */
 369
 370         kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));
 371
 372         if (schedule_work(&djrcv_dev->work) == 0) {
 373                 dbg_hid("%s: did not schedule the work item, was already "
 374                         "queued\n", __func__);
 375         }
 376 }
 377
 378 static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev,
 379                                              struct dj_report *dj_report)
 380 {
 381         /* We are called from atomic context (tasklet && djrcv->lock held) */
 382         unsigned int i;
 383         u8 reportbuffer[MAX_REPORT_SIZE];
 384         struct dj_device *djdev;
 385
 386         djdev = djrcv_dev->paired_dj_devices[dj_report->device_index];
 387
 388         if (!djdev) {
 389                 dbg_hid("djrcv_dev->paired_dj_devices[dj_report->device_index]"
 390                         " is NULL, index %d\n", dj_report->device_index);
 391                 kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));
 392
 393                 if (schedule_work(&djrcv_dev->work) == 0) {
 394                         dbg_hid("%s: did not schedule the work item, was already "
 395                         "queued\n", __func__);
 396                 }
 397                 return;
 398         }
 399
 400         memset(reportbuffer, 0, sizeof(reportbuffer));
 401
 402         for (i = 0; i < NUMBER_OF_HID_REPORTS; i++) {
 403                 if (djdev->reports_supported & (1 << i)) {
 404                         reportbuffer[0] = i;
 405                         if (hid_input_report(djdev->hdev,
 406                                              HID_INPUT_REPORT,
 407                                              reportbuffer,
 408                                              hid_reportid_size_map[i], 1)) {
 409                                 dbg_hid("hid_input_report error sending null "
 410                                         "report\n");
 411                         }
 412                 }
 413         }
 414 }
 415
 416 static void logi_dj_recv_forward_report(struct dj_receiver_dev *djrcv_dev,
 417                                         struct dj_report *dj_report)
 418 {
 419         /* We are called from atomic context (tasklet && djrcv->lock held) */
 420         struct dj_device *dj_device;
 421
 422         dj_device = djrcv_dev->paired_dj_devices[dj_report->device_index];
 423
 424         if (dj_device == NULL) {
 425                 dbg_hid("djrcv_dev->paired_dj_devices[dj_report->device_index]"
 426                         " is NULL, index %d\n", dj_report->device_index);
 427                 kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));
 428
 429                 if (schedule_work(&djrcv_dev->work) == 0) {
 430                         dbg_hid("%s: did not schedule the work item, was already "
 431                         "queued\n", __func__);
 432                 }
 433                 return;
 434         }
 435
 436         if ((dj_report->report_type > ARRAY_SIZE(hid_reportid_size_map) - 1) ||
 437             (hid_reportid_size_map[dj_report->report_type] == 0)) {
 438                 dbg_hid("invalid report type:%x\n", dj_report->report_type);
 439                 return;
 440         }
 441
 442         if (hid_input_report(dj_device->hdev,
 443                         HID_INPUT_REPORT, &dj_report->report_type,
 444                         hid_reportid_size_map[dj_report->report_type], 1)) {
 445                 dbg_hid("hid_input_report error\n");
 446         }
 447 }
 448
 449
 450 static int logi_dj_recv_send_report(struct dj_receiver_dev *djrcv_dev,
 451                                     struct dj_report *dj_report)
 452 {
 453         struct hid_device *hdev = djrcv_dev->hdev;
 454         struct hid_report *report;
 455         struct hid_report_enum *output_report_enum;
 456         u8 *data = (u8 *)(&dj_report->device_index);
 457         unsigned int i;
 458
 459         output_report_enum = &hdev->report_enum[HID_OUTPUT_REPORT];
 460         report = output_report_enum->report_id_hash[REPORT_ID_DJ_SHORT];
 461
 462         if (!report) {
 463                 dev_err(&hdev->dev, "%s: unable to find dj report\n", __func__);
 464                 return -ENODEV;
 465         }
 466
 467         for (i = 0; i < DJREPORT_SHORT_LENGTH - 1; i++)
 468                 report->field[0]->value[i] = data[i];
 469
 470         hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
 471
 472         return 0;
 473 }
 474
 475 static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev)
 476 {
 477         struct dj_report *dj_report;
 478         int retval;
 479
 480         /* no need to protect djrcv_dev->querying_devices */
 481         if (djrcv_dev->querying_devices)
 482                 return 0;
 483
 484         dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
 485         if (!dj_report)
 486                 return -ENOMEM;
 487         dj_report->report_id = REPORT_ID_DJ_SHORT;
 488         dj_report->device_index = 0xFF;
 489         dj_report->report_type = REPORT_TYPE_CMD_GET_PAIRED_DEVICES;
 490         retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
 491         kfree(dj_report);
 492         return retval;
 493 }
 494
 495
 496 static int logi_dj_recv_switch_to_dj_mode(struct dj_receiver_dev *djrcv_dev,
 497                                           unsigned timeout)
 498 {
 499         struct dj_report *dj_report;
 500         int retval;
 501
 502         dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
 503         if (!dj_report)
 504                 return -ENOMEM;
 505         dj_report->report_id = REPORT_ID_DJ_SHORT;
 506         dj_report->device_index = 0xFF;
 507         dj_report->report_type = REPORT_TYPE_CMD_SWITCH;
 508         dj_report->report_params[CMD_SWITCH_PARAM_DEVBITFIELD] = 0x3F;
 509         dj_report->report_params[CMD_SWITCH_PARAM_TIMEOUT_SECONDS] = (u8)timeout;
 510         retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
 511         kfree(dj_report);
 512
 513         /*
 514          * Ugly sleep to work around a USB 3.0 bug when the receiver is still
 515          * processing the "switch-to-dj" command while we send an other command.
 516          * 50 msec should gives enough time to the receiver to be ready.
 517          */
 518         msleep(50);
 519
 520         return retval;
 521 }
 522
 523
 524 static int logi_dj_ll_open(struct hid_device *hid)
 525 {
 526         dbg_hid("%s:%s\n", __func__, hid->phys);
 527         return 0;
 528
 529 }
 530
 531 static void logi_dj_ll_close(struct hid_device *hid)
 532 {
 533         dbg_hid("%s:%s\n", __func__, hid->phys);
 534 }
 535
 536 static int logi_dj_ll_raw_request(struct hid_device *hid,
 537                                   unsigned char reportnum, __u8 *buf,
 538                                   size_t count, unsigned char report_type,
 539                                   int reqtype)
 540 {
 541         struct dj_device *djdev = hid->driver_data;
 542         struct dj_receiver_dev *djrcv_dev = djdev->dj_receiver_dev;
 543         u8 *out_buf;
 544         int ret;
 545
 546         if (buf[0] != REPORT_TYPE_LEDS)
 547                 return -EINVAL;
 548
 549         out_buf = kzalloc(DJREPORT_SHORT_LENGTH, GFP_ATOMIC);
 550         if (!out_buf)
 551                 return -ENOMEM;
 552
 553         if (count > DJREPORT_SHORT_LENGTH - 2)
 554                 count = DJREPORT_SHORT_LENGTH - 2;
 555
 556         out_buf[0] = REPORT_ID_DJ_SHORT;
 557         out_buf[1] = djdev->device_index;
 558         memcpy(out_buf + 2, buf, count);
 559
 560         ret = hid_hw_raw_request(djrcv_dev->hdev, out_buf[0], out_buf,
 561                 DJREPORT_SHORT_LENGTH, report_type, reqtype);
 562
 563         kfree(out_buf);
 564         return ret;
 565 }
 566
 567 static void rdcat(char *rdesc, unsigned int *rsize, const char *data, unsigned int size)
 568 {
 569         memcpy(rdesc + *rsize, data, size);
 570         *rsize += size;
 571 }
 572
 573 static int logi_dj_ll_parse(struct hid_device *hid)
 574 {
 575         struct dj_device *djdev = hid->driver_data;
 576         unsigned int rsize = 0;
 577         char *rdesc;
 578         int retval;
 579
 580         dbg_hid("%s\n", __func__);
 581
 582         djdev->hdev->version = 0x0111;
 583         djdev->hdev->country = 0x00;
 584
 585         rdesc = kmalloc(MAX_RDESC_SIZE, GFP_KERNEL);
 586         if (!rdesc)
 587                 return -ENOMEM;
 588
 589         if (djdev->reports_supported & STD_KEYBOARD) {
 590                 dbg_hid("%s: sending a kbd descriptor, reports_supported: %x\n",
 591                         __func__, djdev->reports_supported);
 592                 rdcat(rdesc, &rsize, kbd_descriptor, sizeof(kbd_descriptor));
 593         }
 594
 595         if (djdev->reports_supported & STD_MOUSE) {
 596                 dbg_hid("%s: sending a mouse descriptor, reports_supported: "
 597                         "%x\n", __func__, djdev->reports_supported);
 598                 rdcat(rdesc, &rsize, mse_descriptor, sizeof(mse_descriptor));
 599         }
 600
 601         if (djdev->reports_supported & MULTIMEDIA) {
 602                 dbg_hid("%s: sending a multimedia report descriptor: %x\n",
 603                         __func__, djdev->reports_supported);
 604                 rdcat(rdesc, &rsize, consumer_descriptor, sizeof(consumer_descriptor));
 605         }
 606
 607         if (djdev->reports_supported & POWER_KEYS) {
 608                 dbg_hid("%s: sending a power keys report descriptor: %x\n",
 609                         __func__, djdev->reports_supported);
 610                 rdcat(rdesc, &rsize, syscontrol_descriptor, sizeof(syscontrol_descriptor));
 611         }
 612
 613         if (djdev->reports_supported & MEDIA_CENTER) {
 614                 dbg_hid("%s: sending a media center report descriptor: %x\n",
 615                         __func__, djdev->reports_supported);
 616                 rdcat(rdesc, &rsize, media_descriptor, sizeof(media_descriptor));
 617         }
 618
 619         if (djdev->reports_supported & KBD_LEDS) {
 620                 dbg_hid("%s: need to send kbd leds report descriptor: %x\n",
 621                         __func__, djdev->reports_supported);
 622         }
 623
 624         retval = hid_parse_report(hid, rdesc, rsize);
 625         kfree(rdesc);
 626
 627         return retval;
 628 }
 629
 630 static int logi_dj_ll_start(struct hid_device *hid)
 631 {
 632         dbg_hid("%s\n", __func__);
 633         return 0;
 634 }
 635
 636 static void logi_dj_ll_stop(struct hid_device *hid)
 637 {
 638         dbg_hid("%s\n", __func__);
 639 }
 640
 641
 642 static struct hid_ll_driver logi_dj_ll_driver = {
 643         .parse = logi_dj_ll_parse,
 644         .start = logi_dj_ll_start,
 645         .stop = logi_dj_ll_stop,
 646         .open = logi_dj_ll_open,
 647         .close = logi_dj_ll_close,
 648         .raw_request = logi_dj_ll_raw_request,
 649 };
 650
 651
 652 static int logi_dj_raw_event(struct hid_device *hdev,
 653                              struct hid_report *report, u8 *data,
 654                              int size)
 655 {
 656         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
 657         struct dj_report *dj_report = (struct dj_report *) data;
 658         unsigned long flags;
 659         bool report_processed = false;
 660
 661         dbg_hid("%s, size:%d\n", __func__, size);
 662
 663         /* Here we receive all data coming from iface 2, there are 4 cases:
 664          *
 665          * 1) Data should continue its normal processing i.e. data does not
 666          * come from the DJ collection, in which case we do nothing and
 667          * return 0, so hid-core can continue normal processing (will forward
 668          * to associated hidraw device)
 669          *
 670          * 2) Data is from DJ collection, and is intended for this driver i. e.
 671          * data contains arrival, departure, etc notifications, in which case
 672          * we queue them for delayed processing by the work queue. We return 1
 673          * to hid-core as no further processing is required from it.
 674          *
 675          * 3) Data is from DJ collection, and informs a connection change,
 676          * if the change means rf link loss, then we must send a null report
 677          * to the upper layer to discard potentially pressed keys that may be
 678          * repeated forever by the input layer. Return 1 to hid-core as no
 679          * further processing is required.
 680          *
 681          * 4) Data is from DJ collection and is an actual input event from
 682          * a paired DJ device in which case we forward it to the correct hid
 683          * device (via hid_input_report() ) and return 1 so hid-core does not do
 684          * anything else with it.
 685          */
 686         if ((dj_report->device_index < DJ_DEVICE_INDEX_MIN) ||
 687             (dj_report->device_index > DJ_DEVICE_INDEX_MAX)) {
 688                 dev_err(&hdev->dev, "%s: invalid device index:%d\n",
 689                                 __func__, dj_report->device_index);
 690                 return false;
 691         }
 692
 693         spin_lock_irqsave(&djrcv_dev->lock, flags);
 694         if (dj_report->report_id == REPORT_ID_DJ_SHORT) {
 695                 switch (dj_report->report_type) {
 696                 case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
 697                 case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
 698                         logi_dj_recv_queue_notification(djrcv_dev, dj_report);
 699                         break;
 700                 case REPORT_TYPE_NOTIF_CONNECTION_STATUS:
 701                         if (dj_report->report_params[CONNECTION_STATUS_PARAM_STATUS] ==
 702                             STATUS_LINKLOSS) {
 703                                 logi_dj_recv_forward_null_report(djrcv_dev, dj_report);
 704                         }
 705                         break;
 706                 default:
 707                         logi_dj_recv_forward_report(djrcv_dev, dj_report);
 708                 }
 709                 report_processed = true;
 710         }
 711         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 712
 713         return report_processed;
 714 }
 715
 716 static int logi_dj_probe(struct hid_device *hdev,
 717                          const struct hid_device_id *id)
 718 {
 719         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 720         struct dj_receiver_dev *djrcv_dev;
 721         int retval;
 722
 723         if (is_dj_device((struct dj_device *)hdev->driver_data))
 724                 return -ENODEV;
 725
 726         dbg_hid("%s called for ifnum %d\n", __func__,
 727                 intf->cur_altsetting->desc.bInterfaceNumber);
 728
 729         /* Ignore interfaces 0 and 1, they will not carry any data, dont create
 730          * any hid_device for them */
 731         if (intf->cur_altsetting->desc.bInterfaceNumber !=
 732             LOGITECH_DJ_INTERFACE_NUMBER) {
 733                 dbg_hid("%s: ignoring ifnum %d\n", __func__,
 734                         intf->cur_altsetting->desc.bInterfaceNumber);
 735                 return -ENODEV;
 736         }
 737
 738         /* Treat interface 2 */
 739
 740         djrcv_dev = kzalloc(sizeof(struct dj_receiver_dev), GFP_KERNEL);
 741         if (!djrcv_dev) {
 742                 dev_err(&hdev->dev,
 743                         "%s:failed allocating dj_receiver_dev\n", __func__);
 744                 return -ENOMEM;
 745         }
 746         djrcv_dev->hdev = hdev;
 747         INIT_WORK(&djrcv_dev->work, delayedwork_callback);
 748         spin_lock_init(&djrcv_dev->lock);
 749         if (kfifo_alloc(&djrcv_dev->notif_fifo,
 750                         DJ_MAX_NUMBER_NOTIFICATIONS * sizeof(struct dj_report),
 751                         GFP_KERNEL)) {
 752                 dev_err(&hdev->dev,
 753                         "%s:failed allocating notif_fifo\n", __func__);
 754                 kfree(djrcv_dev);
 755                 return -ENOMEM;
 756         }
 757         hid_set_drvdata(hdev, djrcv_dev);
 758
 759         /* Call  to usbhid to fetch the HID descriptors of interface 2 and
 760          * subsequently call to the hid/hid-core to parse the fetched
 761          * descriptors, this will in turn create the hidraw and hiddev nodes
 762          * for interface 2 of the receiver */
 763         retval = hid_parse(hdev);
 764         if (retval) {
 765                 dev_err(&hdev->dev,
 766                         "%s:parse of interface 2 failed\n", __func__);
 767                 goto hid_parse_fail;
 768         }
 769
 770         if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, REPORT_ID_DJ_SHORT,
 771                                  0, DJREPORT_SHORT_LENGTH - 1)) {
 772                 retval = -ENODEV;
 773                 goto hid_parse_fail;
 774         }
 775
 776         /* Starts the usb device and connects to upper interfaces hiddev and
 777          * hidraw */
 778         retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 779         if (retval) {
 780                 dev_err(&hdev->dev,
 781                         "%s:hid_hw_start returned error\n", __func__);
 782                 goto hid_hw_start_fail;
 783         }
 784
 785         retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
 786         if (retval < 0) {
 787                 dev_err(&hdev->dev,
 788                         "%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
 789                         __func__, retval);
 790                 goto switch_to_dj_mode_fail;
 791         }
 792
 793         /* This is enabling the polling urb on the IN endpoint */
 794         retval = hid_hw_open(hdev);
 795         if (retval < 0) {
 796                 dev_err(&hdev->dev, "%s:hid_hw_open returned error:%d\n",
 797                         __func__, retval);
 798                 goto llopen_failed;
 799         }
 800
 801         /* Allow incoming packets to arrive: */
 802         hid_device_io_start(hdev);
 803
 804         retval = logi_dj_recv_query_paired_devices(djrcv_dev);
 805         if (retval < 0) {
 806                 dev_err(&hdev->dev, "%s:logi_dj_recv_query_paired_devices "
 807                         "error:%d\n", __func__, retval);
 808                 goto logi_dj_recv_query_paired_devices_failed;
 809         }
 810
 811         return retval;
 812
 813 logi_dj_recv_query_paired_devices_failed:
 814         hid_hw_close(hdev);
 815
 816 llopen_failed:
 817 switch_to_dj_mode_fail:
 818         hid_hw_stop(hdev);
 819
 820 hid_hw_start_fail:
 821 hid_parse_fail:
 822         kfifo_free(&djrcv_dev->notif_fifo);
 823         kfree(djrcv_dev);
 824         hid_set_drvdata(hdev, NULL);
 825         return retval;
 826
 827 }
 828
 829 #ifdef CONFIG_PM
 830 static int logi_dj_reset_resume(struct hid_device *hdev)
 831 {
 832         int retval;
 833         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
 834
 835         retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
 836         if (retval < 0) {
 837                 dev_err(&hdev->dev,
 838                         "%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
 839                         __func__, retval);
 840         }
 841
 842         return 0;
 843 }
 844 #endif
 845
 846 static void logi_dj_remove(struct hid_device *hdev)
 847 {
 848         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
 849         struct dj_device *dj_dev;
 850         int i;
 851
 852         dbg_hid("%s\n", __func__);
 853
 854         cancel_work_sync(&djrcv_dev->work);
 855
 856         hid_hw_close(hdev);
 857         hid_hw_stop(hdev);
 858
 859         /* I suppose that at this point the only context that can access
 860          * the djrecv_data is this thread as the work item is guaranteed to
 861          * have finished and no more raw_event callbacks should arrive after
 862          * the remove callback was triggered so no locks are put around the
 863          * code below */
 864         for (i = 0; i < (DJ_MAX_PAIRED_DEVICES + DJ_DEVICE_INDEX_MIN); i++) {
 865                 dj_dev = djrcv_dev->paired_dj_devices[i];
 866                 if (dj_dev != NULL) {
 867                         hid_destroy_device(dj_dev->hdev);
 868                         kfree(dj_dev);
 869                         djrcv_dev->paired_dj_devices[i] = NULL;
 870                 }
 871         }
 872
 873         kfifo_free(&djrcv_dev->notif_fifo);
 874         kfree(djrcv_dev);
 875         hid_set_drvdata(hdev, NULL);
 876 }
 877
 878 static int logi_djdevice_probe(struct hid_device *hdev,
 879                          const struct hid_device_id *id)
 880 {
 881         int ret;
 882         struct dj_device *dj_dev = hdev->driver_data;
 883
 884         if (!is_dj_device(dj_dev))
 885                 return -ENODEV;
 886
 887         ret = hid_parse(hdev);
 888         if (!ret)
 889                 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 890
 891         return ret;
 892 }
 893
 894 static const struct hid_device_id logi_dj_receivers[] = {
 895         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 896                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
 897         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 898                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
 899         {}
 900 };
 901
 902 MODULE_DEVICE_TABLE(hid, logi_dj_receivers);
 903
 904 static struct hid_driver logi_djreceiver_driver = {
 905         .name = "logitech-djreceiver",
 906         .id_table = logi_dj_receivers,
 907         .probe = logi_dj_probe,
 908         .remove = logi_dj_remove,
 909         .raw_event = logi_dj_raw_event,
 910 #ifdef CONFIG_PM
 911         .reset_resume = logi_dj_reset_resume,
 912 #endif
 913 };
 914
 915
 916 static const struct hid_device_id logi_dj_devices[] = {
 917         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 918                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
 919         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 920                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
 921         {}
 922 };
 923
 924 static struct hid_driver logi_djdevice_driver = {
 925         .name = "logitech-djdevice",
 926         .id_table = logi_dj_devices,
 927         .probe = logi_djdevice_probe,
 928 };
 929
 930
 931 static int __init logi_dj_init(void)
 932 {
 933         int retval;
 934
 935         dbg_hid("Logitech-DJ:%s\n", __func__);
 936
 937         retval = hid_register_driver(&logi_djreceiver_driver);
 938         if (retval)
 939                 return retval;
 940
 941         retval = hid_register_driver(&logi_djdevice_driver);
 942         if (retval)
 943                 hid_unregister_driver(&logi_djreceiver_driver);
 944
 945         return retval;
 946
 947 }
 948
 949 static void __exit logi_dj_exit(void)
 950 {
 951         dbg_hid("Logitech-DJ:%s\n", __func__);
 952
 953         hid_unregister_driver(&logi_djdevice_driver);
 954         hid_unregister_driver(&logi_djreceiver_driver);
 955
 956 }
 957
 958 module_init(logi_dj_init);
 959 module_exit(logi_dj_exit);
 960 MODULE_LICENSE("GPL");
 961 MODULE_AUTHOR("Logitech");
 962 MODULE_AUTHOR("Nestor Lopez Casado");
 963 MODULE_AUTHOR("nlopezcasad@logitech.com");