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 <linux/kfifo.h>
  30 #include <asm/unaligned.h>
  31 #include "hid-ids.h"
  32
  33 #define DJ_MAX_PAIRED_DEVICES                   6
  34 #define DJ_MAX_NUMBER_NOTIFICATIONS             8
  35 #define DJ_RECEIVER_INDEX                       0
  36 #define DJ_DEVICE_INDEX_MIN                     1
  37 #define DJ_DEVICE_INDEX_MAX                     6
  38
  39 #define DJREPORT_SHORT_LENGTH                   15
  40 #define DJREPORT_LONG_LENGTH                    32
  41
  42 #define REPORT_ID_DJ_SHORT                      0x20
  43 #define REPORT_ID_DJ_LONG                       0x21
  44
  45 #define REPORT_ID_HIDPP_SHORT                   0x10
  46 #define REPORT_ID_HIDPP_LONG                    0x11
  47
  48 #define HIDPP_REPORT_SHORT_LENGTH               7
  49 #define HIDPP_REPORT_LONG_LENGTH                20
  50
  51 #define HIDPP_RECEIVER_INDEX                    0xff
  52
  53 #define REPORT_TYPE_RFREPORT_FIRST              0x01
  54 #define REPORT_TYPE_RFREPORT_LAST               0x1F
  55
  56 /* Command Switch to DJ mode */
  57 #define REPORT_TYPE_CMD_SWITCH                  0x80
  58 #define CMD_SWITCH_PARAM_DEVBITFIELD            0x00
  59 #define CMD_SWITCH_PARAM_TIMEOUT_SECONDS        0x01
  60 #define TIMEOUT_NO_KEEPALIVE                    0x00
  61
  62 /* Command to Get the list of Paired devices */
  63 #define REPORT_TYPE_CMD_GET_PAIRED_DEVICES      0x81
  64
  65 /* Device Paired Notification */
  66 #define REPORT_TYPE_NOTIF_DEVICE_PAIRED         0x41
  67 #define SPFUNCTION_MORE_NOTIF_EXPECTED          0x01
  68 #define SPFUNCTION_DEVICE_LIST_EMPTY            0x02
  69 #define DEVICE_PAIRED_PARAM_SPFUNCTION          0x00
  70 #define DEVICE_PAIRED_PARAM_EQUAD_ID_LSB        0x01
  71 #define DEVICE_PAIRED_PARAM_EQUAD_ID_MSB        0x02
  72 #define DEVICE_PAIRED_RF_REPORT_TYPE            0x03
  73
  74 /* Device Un-Paired Notification */
  75 #define REPORT_TYPE_NOTIF_DEVICE_UNPAIRED       0x40
  76
  77
  78 /* Connection Status Notification */
  79 #define REPORT_TYPE_NOTIF_CONNECTION_STATUS     0x42
  80 #define CONNECTION_STATUS_PARAM_STATUS          0x00
  81 #define STATUS_LINKLOSS                         0x01
  82
  83 /* Error Notification */
  84 #define REPORT_TYPE_NOTIF_ERROR                 0x7F
  85 #define NOTIF_ERROR_PARAM_ETYPE                 0x00
  86 #define ETYPE_KEEPALIVE_TIMEOUT                 0x01
  87
  88 /* supported DJ HID && RF report types */
  89 #define REPORT_TYPE_KEYBOARD                    0x01
  90 #define REPORT_TYPE_MOUSE                       0x02
  91 #define REPORT_TYPE_CONSUMER_CONTROL            0x03
  92 #define REPORT_TYPE_SYSTEM_CONTROL              0x04
  93 #define REPORT_TYPE_MEDIA_CENTER                0x08
  94 #define REPORT_TYPE_LEDS                        0x0E
  95
  96 /* RF Report types bitfield */
  97 #define STD_KEYBOARD                            0x00000002
  98 #define STD_MOUSE                               0x00000004
  99 #define MULTIMEDIA                              0x00000008
 100 #define POWER_KEYS                              0x00000010
 101 #define MEDIA_CENTER                            0x00000100
 102 #define KBD_LEDS                                0x00004000
 103
 104 struct dj_report {
 105         u8 report_id;
 106         u8 device_index;
 107         u8 report_type;
 108         u8 report_params[DJREPORT_SHORT_LENGTH - 3];
 109 };
 110
 111 struct dj_receiver_dev {
 112         struct hid_device *hdev;
 113         struct dj_device *paired_dj_devices[DJ_MAX_PAIRED_DEVICES +
 114                                             DJ_DEVICE_INDEX_MIN];
 115         struct work_struct work;
 116         struct kfifo notif_fifo;
 117         spinlock_t lock;
 118         bool querying_devices;
 119 };
 120
 121 struct dj_device {
 122         struct hid_device *hdev;
 123         struct dj_receiver_dev *dj_receiver_dev;
 124         u32 reports_supported;
 125         u8 device_index;
 126 };
 127
 128 /* Keyboard descriptor (1) */
 129 static const char kbd_descriptor[] = {
 130         0x05, 0x01,             /* USAGE_PAGE (generic Desktop)     */
 131         0x09, 0x06,             /* USAGE (Keyboard)         */
 132         0xA1, 0x01,             /* COLLECTION (Application)     */
 133         0x85, 0x01,             /* REPORT_ID (1)            */
 134         0x95, 0x08,             /*   REPORT_COUNT (8)           */
 135         0x75, 0x01,             /*   REPORT_SIZE (1)            */
 136         0x15, 0x00,             /*   LOGICAL_MINIMUM (0)        */
 137         0x25, 0x01,             /*   LOGICAL_MAXIMUM (1)        */
 138         0x05, 0x07,             /*   USAGE_PAGE (Keyboard)      */
 139         0x19, 0xE0,             /*   USAGE_MINIMUM (Left Control)   */
 140         0x29, 0xE7,             /*   USAGE_MAXIMUM (Right GUI)      */
 141         0x81, 0x02,             /*   INPUT (Data,Var,Abs)       */
 142         0x95, 0x06,             /*   REPORT_COUNT (6)           */
 143         0x75, 0x08,             /*   REPORT_SIZE (8)            */
 144         0x15, 0x00,             /*   LOGICAL_MINIMUM (0)        */
 145         0x26, 0xFF, 0x00,       /*   LOGICAL_MAXIMUM (255)      */
 146         0x05, 0x07,             /*   USAGE_PAGE (Keyboard)      */
 147         0x19, 0x00,             /*   USAGE_MINIMUM (no event)       */
 148         0x2A, 0xFF, 0x00,       /*   USAGE_MAXIMUM (reserved)       */
 149         0x81, 0x00,             /*   INPUT (Data,Ary,Abs)       */
 150         0x85, 0x0e,             /* REPORT_ID (14)               */
 151         0x05, 0x08,             /*   USAGE PAGE (LED page)      */
 152         0x95, 0x05,             /*   REPORT COUNT (5)           */
 153         0x75, 0x01,             /*   REPORT SIZE (1)            */
 154         0x15, 0x00,             /*   LOGICAL_MINIMUM (0)        */
 155         0x25, 0x01,             /*   LOGICAL_MAXIMUM (1)        */
 156         0x19, 0x01,             /*   USAGE MINIMUM (1)          */
 157         0x29, 0x05,             /*   USAGE MAXIMUM (5)          */
 158         0x91, 0x02,             /*   OUTPUT (Data, Variable, Absolute)  */
 159         0x95, 0x01,             /*   REPORT COUNT (1)           */
 160         0x75, 0x03,             /*   REPORT SIZE (3)            */
 161         0x91, 0x01,             /*   OUTPUT (Constant)          */
 162         0xC0
 163 };
 164
 165 /* Mouse descriptor (2)     */
 166 static const char mse_descriptor[] = {
 167         0x05, 0x01,             /*  USAGE_PAGE (Generic Desktop)        */
 168         0x09, 0x02,             /*  USAGE (Mouse)                       */
 169         0xA1, 0x01,             /*  COLLECTION (Application)            */
 170         0x85, 0x02,             /*    REPORT_ID = 2                     */
 171         0x09, 0x01,             /*    USAGE (pointer)                   */
 172         0xA1, 0x00,             /*    COLLECTION (physical)             */
 173         0x05, 0x09,             /*      USAGE_PAGE (buttons)            */
 174         0x19, 0x01,             /*      USAGE_MIN (1)                   */
 175         0x29, 0x10,             /*      USAGE_MAX (16)                  */
 176         0x15, 0x00,             /*      LOGICAL_MIN (0)                 */
 177         0x25, 0x01,             /*      LOGICAL_MAX (1)                 */
 178         0x95, 0x10,             /*      REPORT_COUNT (16)               */
 179         0x75, 0x01,             /*      REPORT_SIZE (1)                 */
 180         0x81, 0x02,             /*      INPUT (data var abs)            */
 181         0x05, 0x01,             /*      USAGE_PAGE (generic desktop)    */
 182         0x16, 0x01, 0xF8,       /*      LOGICAL_MIN (-2047)             */
 183         0x26, 0xFF, 0x07,       /*      LOGICAL_MAX (2047)              */
 184         0x75, 0x0C,             /*      REPORT_SIZE (12)                */
 185         0x95, 0x02,             /*      REPORT_COUNT (2)                */
 186         0x09, 0x30,             /*      USAGE (X)                       */
 187         0x09, 0x31,             /*      USAGE (Y)                       */
 188         0x81, 0x06,             /*      INPUT                           */
 189         0x15, 0x81,             /*      LOGICAL_MIN (-127)              */
 190         0x25, 0x7F,             /*      LOGICAL_MAX (127)               */
 191         0x75, 0x08,             /*      REPORT_SIZE (8)                 */
 192         0x95, 0x01,             /*      REPORT_COUNT (1)                */
 193         0x09, 0x38,             /*      USAGE (wheel)                   */
 194         0x81, 0x06,             /*      INPUT                           */
 195         0x05, 0x0C,             /*      USAGE_PAGE(consumer)            */
 196         0x0A, 0x38, 0x02,       /*      USAGE(AC Pan)                   */
 197         0x95, 0x01,             /*      REPORT_COUNT (1)                */
 198         0x81, 0x06,             /*      INPUT                           */
 199         0xC0,                   /*    END_COLLECTION                    */
 200         0xC0,                   /*  END_COLLECTION                      */
 201 };
 202
 203 /* Consumer Control descriptor (3) */
 204 static const char consumer_descriptor[] = {
 205         0x05, 0x0C,             /* USAGE_PAGE (Consumer Devices)       */
 206         0x09, 0x01,             /* USAGE (Consumer Control)            */
 207         0xA1, 0x01,             /* COLLECTION (Application)            */
 208         0x85, 0x03,             /* REPORT_ID = 3                       */
 209         0x75, 0x10,             /* REPORT_SIZE (16)                    */
 210         0x95, 0x02,             /* REPORT_COUNT (2)                    */
 211         0x15, 0x01,             /* LOGICAL_MIN (1)                     */
 212         0x26, 0x8C, 0x02,       /* LOGICAL_MAX (652)                   */
 213         0x19, 0x01,             /* USAGE_MIN (1)                       */
 214         0x2A, 0x8C, 0x02,       /* USAGE_MAX (652)                     */
 215         0x81, 0x00,             /* INPUT (Data Ary Abs)                */
 216         0xC0,                   /* END_COLLECTION                      */
 217 };                              /*                                     */
 218
 219 /* System control descriptor (4) */
 220 static const char syscontrol_descriptor[] = {
 221         0x05, 0x01,             /*   USAGE_PAGE (Generic Desktop)      */
 222         0x09, 0x80,             /*   USAGE (System Control)            */
 223         0xA1, 0x01,             /*   COLLECTION (Application)          */
 224         0x85, 0x04,             /*   REPORT_ID = 4                     */
 225         0x75, 0x02,             /*   REPORT_SIZE (2)                   */
 226         0x95, 0x01,             /*   REPORT_COUNT (1)                  */
 227         0x15, 0x01,             /*   LOGICAL_MIN (1)                   */
 228         0x25, 0x03,             /*   LOGICAL_MAX (3)                   */
 229         0x09, 0x82,             /*   USAGE (System Sleep)              */
 230         0x09, 0x81,             /*   USAGE (System Power Down)         */
 231         0x09, 0x83,             /*   USAGE (System Wake Up)            */
 232         0x81, 0x60,             /*   INPUT (Data Ary Abs NPrf Null)    */
 233         0x75, 0x06,             /*   REPORT_SIZE (6)                   */
 234         0x81, 0x03,             /*   INPUT (Cnst Var Abs)              */
 235         0xC0,                   /*   END_COLLECTION                    */
 236 };
 237
 238 /* Media descriptor (8) */
 239 static const char media_descriptor[] = {
 240         0x06, 0xbc, 0xff,       /* Usage Page 0xffbc                   */
 241         0x09, 0x88,             /* Usage 0x0088                        */
 242         0xa1, 0x01,             /* BeginCollection                     */
 243         0x85, 0x08,             /*   Report ID 8                       */
 244         0x19, 0x01,             /*   Usage Min 0x0001                  */
 245         0x29, 0xff,             /*   Usage Max 0x00ff                  */
 246         0x15, 0x01,             /*   Logical Min 1                     */
 247         0x26, 0xff, 0x00,       /*   Logical Max 255                   */
 248         0x75, 0x08,             /*   Report Size 8                     */
 249         0x95, 0x01,             /*   Report Count 1                    */
 250         0x81, 0x00,             /*   Input                             */
 251         0xc0,                   /* EndCollection                       */
 252 };                              /*                                     */
 253
 254 /* HIDPP descriptor */
 255 static const char hidpp_descriptor[] = {
 256         0x06, 0x00, 0xff,       /* Usage Page (Vendor Defined Page 1)  */
 257         0x09, 0x01,             /* Usage (Vendor Usage 1)              */
 258         0xa1, 0x01,             /* Collection (Application)            */
 259         0x85, 0x10,             /*   Report ID (16)                    */
 260         0x75, 0x08,             /*   Report Size (8)                   */
 261         0x95, 0x06,             /*   Report Count (6)                  */
 262         0x15, 0x00,             /*   Logical Minimum (0)               */
 263         0x26, 0xff, 0x00,       /*   Logical Maximum (255)             */
 264         0x09, 0x01,             /*   Usage (Vendor Usage 1)            */
 265         0x81, 0x00,             /*   Input (Data,Arr,Abs)              */
 266         0x09, 0x01,             /*   Usage (Vendor Usage 1)            */
 267         0x91, 0x00,             /*   Output (Data,Arr,Abs)             */
 268         0xc0,                   /* End Collection                      */
 269         0x06, 0x00, 0xff,       /* Usage Page (Vendor Defined Page 1)  */
 270         0x09, 0x02,             /* Usage (Vendor Usage 2)              */
 271         0xa1, 0x01,             /* Collection (Application)            */
 272         0x85, 0x11,             /*   Report ID (17)                    */
 273         0x75, 0x08,             /*   Report Size (8)                   */
 274         0x95, 0x13,             /*   Report Count (19)                 */
 275         0x15, 0x00,             /*   Logical Minimum (0)               */
 276         0x26, 0xff, 0x00,       /*   Logical Maximum (255)             */
 277         0x09, 0x02,             /*   Usage (Vendor Usage 2)            */
 278         0x81, 0x00,             /*   Input (Data,Arr,Abs)              */
 279         0x09, 0x02,             /*   Usage (Vendor Usage 2)            */
 280         0x91, 0x00,             /*   Output (Data,Arr,Abs)             */
 281         0xc0,                   /* End Collection                      */
 282         0x06, 0x00, 0xff,       /* Usage Page (Vendor Defined Page 1)  */
 283         0x09, 0x04,             /* Usage (Vendor Usage 0x04)           */
 284         0xa1, 0x01,             /* Collection (Application)            */
 285         0x85, 0x20,             /*   Report ID (32)                    */
 286         0x75, 0x08,             /*   Report Size (8)                   */
 287         0x95, 0x0e,             /*   Report Count (14)                 */
 288         0x15, 0x00,             /*   Logical Minimum (0)               */
 289         0x26, 0xff, 0x00,       /*   Logical Maximum (255)             */
 290         0x09, 0x41,             /*   Usage (Vendor Usage 0x41)         */
 291         0x81, 0x00,             /*   Input (Data,Arr,Abs)              */
 292         0x09, 0x41,             /*   Usage (Vendor Usage 0x41)         */
 293         0x91, 0x00,             /*   Output (Data,Arr,Abs)             */
 294         0x85, 0x21,             /*   Report ID (33)                    */
 295         0x95, 0x1f,             /*   Report Count (31)                 */
 296         0x15, 0x00,             /*   Logical Minimum (0)               */
 297         0x26, 0xff, 0x00,       /*   Logical Maximum (255)             */
 298         0x09, 0x42,             /*   Usage (Vendor Usage 0x42)         */
 299         0x81, 0x00,             /*   Input (Data,Arr,Abs)              */
 300         0x09, 0x42,             /*   Usage (Vendor Usage 0x42)         */
 301         0x91, 0x00,             /*   Output (Data,Arr,Abs)             */
 302         0xc0,                   /* End Collection                      */
 303 };
 304
 305 /* Maximum size of all defined hid reports in bytes (including report id) */
 306 #define MAX_REPORT_SIZE 8
 307
 308 /* Make sure all descriptors are present here */
 309 #define MAX_RDESC_SIZE                          \
 310         (sizeof(kbd_descriptor) +               \
 311          sizeof(mse_descriptor) +               \
 312          sizeof(consumer_descriptor) +          \
 313          sizeof(syscontrol_descriptor) +        \
 314          sizeof(media_descriptor) +     \
 315          sizeof(hidpp_descriptor))
 316
 317 /* Number of possible hid report types that can be created by this driver.
 318  *
 319  * Right now, RF report types have the same report types (or report id's)
 320  * than the hid report created from those RF reports. In the future
 321  * this doesnt have to be true.
 322  *
 323  * For instance, RF report type 0x01 which has a size of 8 bytes, corresponds
 324  * to hid report id 0x01, this is standard keyboard. Same thing applies to mice
 325  * reports and consumer control, etc. If a new RF report is created, it doesn't
 326  * has to have the same report id as its corresponding hid report, so an
 327  * translation may have to take place for future report types.
 328  */
 329 #define NUMBER_OF_HID_REPORTS 32
 330 static const u8 hid_reportid_size_map[NUMBER_OF_HID_REPORTS] = {
 331         [1] = 8,                /* Standard keyboard */
 332         [2] = 8,                /* Standard mouse */
 333         [3] = 5,                /* Consumer control */
 334         [4] = 2,                /* System control */
 335         [8] = 2,                /* Media Center */
 336 };
 337
 338
 339 #define LOGITECH_DJ_INTERFACE_NUMBER 0x02
 340
 341 static struct hid_ll_driver logi_dj_ll_driver;
 342
 343 static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev);
 344
 345 static void logi_dj_recv_destroy_djhid_device(struct dj_receiver_dev *djrcv_dev,
 346                                                 struct dj_report *dj_report)
 347 {
 348         /* Called in delayed work context */
 349         struct dj_device *dj_dev;
 350         unsigned long flags;
 351
 352         spin_lock_irqsave(&djrcv_dev->lock, flags);
 353         dj_dev = djrcv_dev->paired_dj_devices[dj_report->device_index];
 354         djrcv_dev->paired_dj_devices[dj_report->device_index] = NULL;
 355         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 356
 357         if (dj_dev != NULL) {
 358                 hid_destroy_device(dj_dev->hdev);
 359                 kfree(dj_dev);
 360         } else {
 361                 dev_err(&djrcv_dev->hdev->dev, "%s: can't destroy a NULL device\n",
 362                         __func__);
 363         }
 364 }
 365
 366 static void logi_dj_recv_add_djhid_device(struct dj_receiver_dev *djrcv_dev,
 367                                           struct dj_report *dj_report)
 368 {
 369         /* Called in delayed work context */
 370         struct hid_device *djrcv_hdev = djrcv_dev->hdev;
 371         struct usb_interface *intf = to_usb_interface(djrcv_hdev->dev.parent);
 372         struct usb_device *usbdev = interface_to_usbdev(intf);
 373         struct hid_device *dj_hiddev;
 374         struct dj_device *dj_dev;
 375
 376         /* Device index goes from 1 to 6, we need 3 bytes to store the
 377          * semicolon, the index, and a null terminator
 378          */
 379         unsigned char tmpstr[3];
 380
 381         if (dj_report->report_params[DEVICE_PAIRED_PARAM_SPFUNCTION] &
 382             SPFUNCTION_DEVICE_LIST_EMPTY) {
 383                 dbg_hid("%s: device list is empty\n", __func__);
 384                 djrcv_dev->querying_devices = false;
 385                 return;
 386         }
 387
 388         if (djrcv_dev->paired_dj_devices[dj_report->device_index]) {
 389                 /* The device is already known. No need to reallocate it. */
 390                 dbg_hid("%s: device is already known\n", __func__);
 391                 return;
 392         }
 393
 394         dj_hiddev = hid_allocate_device();
 395         if (IS_ERR(dj_hiddev)) {
 396                 dev_err(&djrcv_hdev->dev, "%s: hid_allocate_device failed\n",
 397                         __func__);
 398                 return;
 399         }
 400
 401         dj_hiddev->ll_driver = &logi_dj_ll_driver;
 402
 403         dj_hiddev->dev.parent = &djrcv_hdev->dev;
 404         dj_hiddev->bus = BUS_USB;
 405         dj_hiddev->vendor = le16_to_cpu(usbdev->descriptor.idVendor);
 406         dj_hiddev->product =
 407                 (dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_MSB]
 408                                                                         << 8) |
 409                 dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_LSB];
 410         snprintf(dj_hiddev->name, sizeof(dj_hiddev->name),
 411                 "Logitech Unifying Device. Wireless PID:%04x",
 412                 dj_hiddev->product);
 413
 414         dj_hiddev->group = HID_GROUP_LOGITECH_DJ_DEVICE;
 415
 416         usb_make_path(usbdev, dj_hiddev->phys, sizeof(dj_hiddev->phys));
 417         snprintf(tmpstr, sizeof(tmpstr), ":%d", dj_report->device_index);
 418         strlcat(dj_hiddev->phys, tmpstr, sizeof(dj_hiddev->phys));
 419
 420         dj_dev = kzalloc(sizeof(struct dj_device), GFP_KERNEL);
 421
 422         if (!dj_dev) {
 423                 dev_err(&djrcv_hdev->dev, "%s: failed allocating dj_device\n",
 424                         __func__);
 425                 goto dj_device_allocate_fail;
 426         }
 427
 428         dj_dev->reports_supported = get_unaligned_le32(
 429                 dj_report->report_params + DEVICE_PAIRED_RF_REPORT_TYPE);
 430         dj_dev->hdev = dj_hiddev;
 431         dj_dev->dj_receiver_dev = djrcv_dev;
 432         dj_dev->device_index = dj_report->device_index;
 433         dj_hiddev->driver_data = dj_dev;
 434
 435         djrcv_dev->paired_dj_devices[dj_report->device_index] = dj_dev;
 436
 437         if (hid_add_device(dj_hiddev)) {
 438                 dev_err(&djrcv_hdev->dev, "%s: failed adding dj_device\n",
 439                         __func__);
 440                 goto hid_add_device_fail;
 441         }
 442
 443         return;
 444
 445 hid_add_device_fail:
 446         djrcv_dev->paired_dj_devices[dj_report->device_index] = NULL;
 447         kfree(dj_dev);
 448 dj_device_allocate_fail:
 449         hid_destroy_device(dj_hiddev);
 450 }
 451
 452 static void delayedwork_callback(struct work_struct *work)
 453 {
 454         struct dj_receiver_dev *djrcv_dev =
 455                 container_of(work, struct dj_receiver_dev, work);
 456
 457         struct dj_report dj_report;
 458         unsigned long flags;
 459         int count;
 460         int retval;
 461
 462         dbg_hid("%s\n", __func__);
 463
 464         spin_lock_irqsave(&djrcv_dev->lock, flags);
 465
 466         count = kfifo_out(&djrcv_dev->notif_fifo, &dj_report,
 467                                 sizeof(struct dj_report));
 468
 469         if (count != sizeof(struct dj_report)) {
 470                 dev_err(&djrcv_dev->hdev->dev, "%s: workitem triggered without "
 471                         "notifications available\n", __func__);
 472                 spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 473                 return;
 474         }
 475
 476         if (!kfifo_is_empty(&djrcv_dev->notif_fifo)) {
 477                 if (schedule_work(&djrcv_dev->work) == 0) {
 478                         dbg_hid("%s: did not schedule the work item, was "
 479                                 "already queued\n", __func__);
 480                 }
 481         }
 482
 483         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 484
 485         switch (dj_report.report_type) {
 486         case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
 487                 logi_dj_recv_add_djhid_device(djrcv_dev, &dj_report);
 488                 break;
 489         case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
 490                 logi_dj_recv_destroy_djhid_device(djrcv_dev, &dj_report);
 491                 break;
 492         default:
 493         /* A normal report (i. e. not belonging to a pair/unpair notification)
 494          * arriving here, means that the report arrived but we did not have a
 495          * paired dj_device associated to the report's device_index, this
 496          * means that the original "device paired" notification corresponding
 497          * to this dj_device never arrived to this driver. The reason is that
 498          * hid-core discards all packets coming from a device while probe() is
 499          * executing. */
 500         if (!djrcv_dev->paired_dj_devices[dj_report.device_index]) {
 501                 /* ok, we don't know the device, just re-ask the
 502                  * receiver for the list of connected devices. */
 503                 retval = logi_dj_recv_query_paired_devices(djrcv_dev);
 504                 if (!retval) {
 505                         /* everything went fine, so just leave */
 506                         break;
 507                 }
 508                 dev_err(&djrcv_dev->hdev->dev,
 509                         "%s:logi_dj_recv_query_paired_devices "
 510                         "error:%d\n", __func__, retval);
 511                 }
 512                 dbg_hid("%s: unexpected report type\n", __func__);
 513         }
 514 }
 515
 516 static void logi_dj_recv_queue_notification(struct dj_receiver_dev *djrcv_dev,
 517                                            struct dj_report *dj_report)
 518 {
 519         /* We are called from atomic context (tasklet && djrcv->lock held) */
 520
 521         kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));
 522
 523         if (schedule_work(&djrcv_dev->work) == 0) {
 524                 dbg_hid("%s: did not schedule the work item, was already "
 525                         "queued\n", __func__);
 526         }
 527 }
 528
 529 static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev,
 530                                              struct dj_report *dj_report)
 531 {
 532         /* We are called from atomic context (tasklet && djrcv->lock held) */
 533         unsigned int i;
 534         u8 reportbuffer[MAX_REPORT_SIZE];
 535         struct dj_device *djdev;
 536
 537         djdev = djrcv_dev->paired_dj_devices[dj_report->device_index];
 538
 539         memset(reportbuffer, 0, sizeof(reportbuffer));
 540
 541         for (i = 0; i < NUMBER_OF_HID_REPORTS; i++) {
 542                 if (djdev->reports_supported & (1 << i)) {
 543                         reportbuffer[0] = i;
 544                         if (hid_input_report(djdev->hdev,
 545                                              HID_INPUT_REPORT,
 546                                              reportbuffer,
 547                                              hid_reportid_size_map[i], 1)) {
 548                                 dbg_hid("hid_input_report error sending null "
 549                                         "report\n");
 550                         }
 551                 }
 552         }
 553 }
 554
 555 static void logi_dj_recv_forward_report(struct dj_receiver_dev *djrcv_dev,
 556                                         struct dj_report *dj_report)
 557 {
 558         /* We are called from atomic context (tasklet && djrcv->lock held) */
 559         struct dj_device *dj_device;
 560
 561         dj_device = djrcv_dev->paired_dj_devices[dj_report->device_index];
 562
 563         if ((dj_report->report_type > ARRAY_SIZE(hid_reportid_size_map) - 1) ||
 564             (hid_reportid_size_map[dj_report->report_type] == 0)) {
 565                 dbg_hid("invalid report type:%x\n", dj_report->report_type);
 566                 return;
 567         }
 568
 569         if (hid_input_report(dj_device->hdev,
 570                         HID_INPUT_REPORT, &dj_report->report_type,
 571                         hid_reportid_size_map[dj_report->report_type], 1)) {
 572                 dbg_hid("hid_input_report error\n");
 573         }
 574 }
 575
 576 static void logi_dj_recv_forward_hidpp(struct dj_device *dj_dev, u8 *data,
 577                                        int size)
 578 {
 579         /* We are called from atomic context (tasklet && djrcv->lock held) */
 580         if (hid_input_report(dj_dev->hdev, HID_INPUT_REPORT, data, size, 1))
 581                 dbg_hid("hid_input_report error\n");
 582 }
 583
 584 static int logi_dj_recv_send_report(struct dj_receiver_dev *djrcv_dev,
 585                                     struct dj_report *dj_report)
 586 {
 587         struct hid_device *hdev = djrcv_dev->hdev;
 588         struct hid_report *report;
 589         struct hid_report_enum *output_report_enum;
 590         u8 *data = (u8 *)(&dj_report->device_index);
 591         unsigned int i;
 592
 593         output_report_enum = &hdev->report_enum[HID_OUTPUT_REPORT];
 594         report = output_report_enum->report_id_hash[REPORT_ID_DJ_SHORT];
 595
 596         if (!report) {
 597                 dev_err(&hdev->dev, "%s: unable to find dj report\n", __func__);
 598                 return -ENODEV;
 599         }
 600
 601         for (i = 0; i < DJREPORT_SHORT_LENGTH - 1; i++)
 602                 report->field[0]->value[i] = data[i];
 603
 604         hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
 605
 606         return 0;
 607 }
 608
 609 static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev)
 610 {
 611         struct dj_report *dj_report;
 612         int retval;
 613
 614         /* no need to protect djrcv_dev->querying_devices */
 615         if (djrcv_dev->querying_devices)
 616                 return 0;
 617
 618         dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
 619         if (!dj_report)
 620                 return -ENOMEM;
 621         dj_report->report_id = REPORT_ID_DJ_SHORT;
 622         dj_report->device_index = 0xFF;
 623         dj_report->report_type = REPORT_TYPE_CMD_GET_PAIRED_DEVICES;
 624         retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
 625         kfree(dj_report);
 626         return retval;
 627 }
 628
 629
 630 static int logi_dj_recv_switch_to_dj_mode(struct dj_receiver_dev *djrcv_dev,
 631                                           unsigned timeout)
 632 {
 633         struct hid_device *hdev = djrcv_dev->hdev;
 634         struct dj_report *dj_report;
 635         u8 *buf;
 636         int retval;
 637
 638         dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
 639         if (!dj_report)
 640                 return -ENOMEM;
 641         dj_report->report_id = REPORT_ID_DJ_SHORT;
 642         dj_report->device_index = 0xFF;
 643         dj_report->report_type = REPORT_TYPE_CMD_SWITCH;
 644         dj_report->report_params[CMD_SWITCH_PARAM_DEVBITFIELD] = 0x3F;
 645         dj_report->report_params[CMD_SWITCH_PARAM_TIMEOUT_SECONDS] = (u8)timeout;
 646         retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
 647
 648         /*
 649          * Ugly sleep to work around a USB 3.0 bug when the receiver is still
 650          * processing the "switch-to-dj" command while we send an other command.
 651          * 50 msec should gives enough time to the receiver to be ready.
 652          */
 653         msleep(50);
 654
 655         /*
 656          * Magical bits to set up hidpp notifications when the dj devices
 657          * are connected/disconnected.
 658          *
 659          * We can reuse dj_report because HIDPP_REPORT_SHORT_LENGTH is smaller
 660          * than DJREPORT_SHORT_LENGTH.
 661          */
 662         buf = (u8 *)dj_report;
 663
 664         memset(buf, 0, HIDPP_REPORT_SHORT_LENGTH);
 665
 666         buf[0] = REPORT_ID_HIDPP_SHORT;
 667         buf[1] = 0xFF;
 668         buf[2] = 0x80;
 669         buf[3] = 0x00;
 670         buf[4] = 0x00;
 671         buf[5] = 0x09;
 672         buf[6] = 0x00;
 673
 674         hid_hw_raw_request(hdev, REPORT_ID_HIDPP_SHORT, buf,
 675                         HIDPP_REPORT_SHORT_LENGTH, HID_OUTPUT_REPORT,
 676                         HID_REQ_SET_REPORT);
 677
 678         kfree(dj_report);
 679         return retval;
 680 }
 681
 682
 683 static int logi_dj_ll_open(struct hid_device *hid)
 684 {
 685         dbg_hid("%s:%s\n", __func__, hid->phys);
 686         return 0;
 687
 688 }
 689
 690 static void logi_dj_ll_close(struct hid_device *hid)
 691 {
 692         dbg_hid("%s:%s\n", __func__, hid->phys);
 693 }
 694
 695 static u8 unifying_name_query[]  = {0x10, 0xff, 0x83, 0xb5, 0x40, 0x00, 0x00};
 696 static u8 unifying_name_answer[] = {0x11, 0xff, 0x83, 0xb5};
 697
 698 static int logi_dj_ll_raw_request(struct hid_device *hid,
 699                                   unsigned char reportnum, __u8 *buf,
 700                                   size_t count, unsigned char report_type,
 701                                   int reqtype)
 702 {
 703         struct dj_device *djdev = hid->driver_data;
 704         struct dj_receiver_dev *djrcv_dev = djdev->dj_receiver_dev;
 705         u8 *out_buf;
 706         int ret;
 707
 708         if ((buf[0] == REPORT_ID_HIDPP_SHORT) ||
 709             (buf[0] == REPORT_ID_HIDPP_LONG)) {
 710                 if (count < 2)
 711                         return -EINVAL;
 712
 713                 /* special case where we should not overwrite
 714                  * the device_index */
 715                 if (count == 7 && !memcmp(buf, unifying_name_query,
 716                                           sizeof(unifying_name_query)))
 717                         buf[4] |= djdev->device_index - 1;
 718                 else
 719                         buf[1] = djdev->device_index;
 720                 return hid_hw_raw_request(djrcv_dev->hdev, reportnum, buf,
 721                                 count, report_type, reqtype);
 722         }
 723
 724         if (buf[0] != REPORT_TYPE_LEDS)
 725                 return -EINVAL;
 726
 727         out_buf = kzalloc(DJREPORT_SHORT_LENGTH, GFP_ATOMIC);
 728         if (!out_buf)
 729                 return -ENOMEM;
 730
 731         if (count > DJREPORT_SHORT_LENGTH - 2)
 732                 count = DJREPORT_SHORT_LENGTH - 2;
 733
 734         out_buf[0] = REPORT_ID_DJ_SHORT;
 735         out_buf[1] = djdev->device_index;
 736         memcpy(out_buf + 2, buf, count);
 737
 738         ret = hid_hw_raw_request(djrcv_dev->hdev, out_buf[0], out_buf,
 739                 DJREPORT_SHORT_LENGTH, report_type, reqtype);
 740
 741         kfree(out_buf);
 742         return ret;
 743 }
 744
 745 static void rdcat(char *rdesc, unsigned int *rsize, const char *data, unsigned int size)
 746 {
 747         memcpy(rdesc + *rsize, data, size);
 748         *rsize += size;
 749 }
 750
 751 static int logi_dj_ll_parse(struct hid_device *hid)
 752 {
 753         struct dj_device *djdev = hid->driver_data;
 754         unsigned int rsize = 0;
 755         char *rdesc;
 756         int retval;
 757
 758         dbg_hid("%s\n", __func__);
 759
 760         djdev->hdev->version = 0x0111;
 761         djdev->hdev->country = 0x00;
 762
 763         rdesc = kmalloc(MAX_RDESC_SIZE, GFP_KERNEL);
 764         if (!rdesc)
 765                 return -ENOMEM;
 766
 767         if (djdev->reports_supported & STD_KEYBOARD) {
 768                 dbg_hid("%s: sending a kbd descriptor, reports_supported: %x\n",
 769                         __func__, djdev->reports_supported);
 770                 rdcat(rdesc, &rsize, kbd_descriptor, sizeof(kbd_descriptor));
 771         }
 772
 773         if (djdev->reports_supported & STD_MOUSE) {
 774                 dbg_hid("%s: sending a mouse descriptor, reports_supported: "
 775                         "%x\n", __func__, djdev->reports_supported);
 776                 rdcat(rdesc, &rsize, mse_descriptor, sizeof(mse_descriptor));
 777         }
 778
 779         if (djdev->reports_supported & MULTIMEDIA) {
 780                 dbg_hid("%s: sending a multimedia report descriptor: %x\n",
 781                         __func__, djdev->reports_supported);
 782                 rdcat(rdesc, &rsize, consumer_descriptor, sizeof(consumer_descriptor));
 783         }
 784
 785         if (djdev->reports_supported & POWER_KEYS) {
 786                 dbg_hid("%s: sending a power keys report descriptor: %x\n",
 787                         __func__, djdev->reports_supported);
 788                 rdcat(rdesc, &rsize, syscontrol_descriptor, sizeof(syscontrol_descriptor));
 789         }
 790
 791         if (djdev->reports_supported & MEDIA_CENTER) {
 792                 dbg_hid("%s: sending a media center report descriptor: %x\n",
 793                         __func__, djdev->reports_supported);
 794                 rdcat(rdesc, &rsize, media_descriptor, sizeof(media_descriptor));
 795         }
 796
 797         if (djdev->reports_supported & KBD_LEDS) {
 798                 dbg_hid("%s: need to send kbd leds report descriptor: %x\n",
 799                         __func__, djdev->reports_supported);
 800         }
 801
 802         rdcat(rdesc, &rsize, hidpp_descriptor, sizeof(hidpp_descriptor));
 803
 804         retval = hid_parse_report(hid, rdesc, rsize);
 805         kfree(rdesc);
 806
 807         return retval;
 808 }
 809
 810 static int logi_dj_ll_start(struct hid_device *hid)
 811 {
 812         dbg_hid("%s\n", __func__);
 813         return 0;
 814 }
 815
 816 static void logi_dj_ll_stop(struct hid_device *hid)
 817 {
 818         dbg_hid("%s\n", __func__);
 819 }
 820
 821
 822 static struct hid_ll_driver logi_dj_ll_driver = {
 823         .parse = logi_dj_ll_parse,
 824         .start = logi_dj_ll_start,
 825         .stop = logi_dj_ll_stop,
 826         .open = logi_dj_ll_open,
 827         .close = logi_dj_ll_close,
 828         .raw_request = logi_dj_ll_raw_request,
 829 };
 830
 831 static int logi_dj_dj_event(struct hid_device *hdev,
 832                              struct hid_report *report, u8 *data,
 833                              int size)
 834 {
 835         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
 836         struct dj_report *dj_report = (struct dj_report *) data;
 837         unsigned long flags;
 838
 839         /*
 840          * Here we receive all data coming from iface 2, there are 3 cases:
 841          *
 842          * 1) Data is intended for this driver i. e. data contains arrival,
 843          * departure, etc notifications, in which case we queue them for delayed
 844          * processing by the work queue. We return 1 to hid-core as no further
 845          * processing is required from it.
 846          *
 847          * 2) Data informs a connection change, if the change means rf link
 848          * loss, then we must send a null report to the upper layer to discard
 849          * potentially pressed keys that may be repeated forever by the input
 850          * layer. Return 1 to hid-core as no further processing is required.
 851          *
 852          * 3) Data is an actual input event from a paired DJ device in which
 853          * case we forward it to the correct hid device (via hid_input_report()
 854          * ) and return 1 so hid-core does not anything else with it.
 855          */
 856
 857         if ((dj_report->device_index < DJ_DEVICE_INDEX_MIN) ||
 858             (dj_report->device_index > DJ_DEVICE_INDEX_MAX)) {
 859                 /*
 860                  * Device index is wrong, bail out.
 861                  * This driver can ignore safely the receiver notifications,
 862                  * so ignore those reports too.
 863                  */
 864                 if (dj_report->device_index != DJ_RECEIVER_INDEX)
 865                         dev_err(&hdev->dev, "%s: invalid device index:%d\n",
 866                                 __func__, dj_report->device_index);
 867                 return false;
 868         }
 869
 870         spin_lock_irqsave(&djrcv_dev->lock, flags);
 871
 872         if (!djrcv_dev->paired_dj_devices[dj_report->device_index]) {
 873                 /* received an event for an unknown device, bail out */
 874                 logi_dj_recv_queue_notification(djrcv_dev, dj_report);
 875                 goto out;
 876         }
 877
 878         switch (dj_report->report_type) {
 879         case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
 880                 /* pairing notifications are handled above the switch */
 881                 break;
 882         case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
 883                 logi_dj_recv_queue_notification(djrcv_dev, dj_report);
 884                 break;
 885         case REPORT_TYPE_NOTIF_CONNECTION_STATUS:
 886                 if (dj_report->report_params[CONNECTION_STATUS_PARAM_STATUS] ==
 887                     STATUS_LINKLOSS) {
 888                         logi_dj_recv_forward_null_report(djrcv_dev, dj_report);
 889                 }
 890                 break;
 891         default:
 892                 logi_dj_recv_forward_report(djrcv_dev, dj_report);
 893         }
 894
 895 out:
 896         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 897
 898         return true;
 899 }
 900
 901 static int logi_dj_hidpp_event(struct hid_device *hdev,
 902                              struct hid_report *report, u8 *data,
 903                              int size)
 904 {
 905         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
 906         struct dj_report *dj_report = (struct dj_report *) data;
 907         unsigned long flags;
 908         u8 device_index = dj_report->device_index;
 909
 910         if (device_index == HIDPP_RECEIVER_INDEX) {
 911                 /* special case were the device wants to know its unifying
 912                  * name */
 913                 if (size == HIDPP_REPORT_LONG_LENGTH &&
 914                     !memcmp(data, unifying_name_answer,
 915                             sizeof(unifying_name_answer)) &&
 916                     ((data[4] & 0xF0) == 0x40))
 917                         device_index = (data[4] & 0x0F) + 1;
 918                 else
 919                         return false;
 920         }
 921
 922         /*
 923          * Data is from the HID++ collection, in this case, we forward the
 924          * data to the corresponding child dj device and return 0 to hid-core
 925          * so he data also goes to the hidraw device of the receiver. This
 926          * allows a user space application to implement the full HID++ routing
 927          * via the receiver.
 928          */
 929
 930         if ((device_index < DJ_DEVICE_INDEX_MIN) ||
 931             (device_index > DJ_DEVICE_INDEX_MAX)) {
 932                 /*
 933                  * Device index is wrong, bail out.
 934                  * This driver can ignore safely the receiver notifications,
 935                  * so ignore those reports too.
 936                  */
 937                 dev_err(&hdev->dev, "%s: invalid device index:%d\n",
 938                                 __func__, dj_report->device_index);
 939                 return false;
 940         }
 941
 942         spin_lock_irqsave(&djrcv_dev->lock, flags);
 943
 944         if (!djrcv_dev->paired_dj_devices[device_index])
 945                 /* received an event for an unknown device, bail out */
 946                 goto out;
 947
 948         logi_dj_recv_forward_hidpp(djrcv_dev->paired_dj_devices[device_index],
 949                                    data, size);
 950
 951 out:
 952         spin_unlock_irqrestore(&djrcv_dev->lock, flags);
 953
 954         return false;
 955 }
 956
 957 static int logi_dj_raw_event(struct hid_device *hdev,
 958                              struct hid_report *report, u8 *data,
 959                              int size)
 960 {
 961         dbg_hid("%s, size:%d\n", __func__, size);
 962
 963         switch (data[0]) {
 964         case REPORT_ID_DJ_SHORT:
 965                 return logi_dj_dj_event(hdev, report, data, size);
 966         case REPORT_ID_HIDPP_SHORT:
 967                 /* intentional fallthrough */
 968         case REPORT_ID_HIDPP_LONG:
 969                 return logi_dj_hidpp_event(hdev, report, data, size);
 970         }
 971
 972         return false;
 973 }
 974
 975 static int logi_dj_probe(struct hid_device *hdev,
 976                          const struct hid_device_id *id)
 977 {
 978         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 979         struct dj_receiver_dev *djrcv_dev;
 980         int retval;
 981
 982         dbg_hid("%s called for ifnum %d\n", __func__,
 983                 intf->cur_altsetting->desc.bInterfaceNumber);
 984
 985         /* Ignore interfaces 0 and 1, they will not carry any data, dont create
 986          * any hid_device for them */
 987         if (intf->cur_altsetting->desc.bInterfaceNumber !=
 988             LOGITECH_DJ_INTERFACE_NUMBER) {
 989                 dbg_hid("%s: ignoring ifnum %d\n", __func__,
 990                         intf->cur_altsetting->desc.bInterfaceNumber);
 991                 return -ENODEV;
 992         }
 993
 994         /* Treat interface 2 */
 995
 996         djrcv_dev = kzalloc(sizeof(struct dj_receiver_dev), GFP_KERNEL);
 997         if (!djrcv_dev) {
 998                 dev_err(&hdev->dev,
 999                         "%s:failed allocating dj_receiver_dev\n", __func__);
1000                 return -ENOMEM;
1001         }
1002         djrcv_dev->hdev = hdev;
1003         INIT_WORK(&djrcv_dev->work, delayedwork_callback);
1004         spin_lock_init(&djrcv_dev->lock);
1005         if (kfifo_alloc(&djrcv_dev->notif_fifo,
1006                         DJ_MAX_NUMBER_NOTIFICATIONS * sizeof(struct dj_report),
1007                         GFP_KERNEL)) {
1008                 dev_err(&hdev->dev,
1009                         "%s:failed allocating notif_fifo\n", __func__);
1010                 kfree(djrcv_dev);
1011                 return -ENOMEM;
1012         }
1013         hid_set_drvdata(hdev, djrcv_dev);
1014
1015         /* Call  to usbhid to fetch the HID descriptors of interface 2 and
1016          * subsequently call to the hid/hid-core to parse the fetched
1017          * descriptors, this will in turn create the hidraw and hiddev nodes
1018          * for interface 2 of the receiver */
1019         retval = hid_parse(hdev);
1020         if (retval) {
1021                 dev_err(&hdev->dev,
1022                         "%s:parse of interface 2 failed\n", __func__);
1023                 goto hid_parse_fail;
1024         }
1025
1026         if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, REPORT_ID_DJ_SHORT,
1027                                  0, DJREPORT_SHORT_LENGTH - 1)) {
1028                 retval = -ENODEV;
1029                 goto hid_parse_fail;
1030         }
1031
1032         /* Starts the usb device and connects to upper interfaces hiddev and
1033          * hidraw */
1034         retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
1035         if (retval) {
1036                 dev_err(&hdev->dev,
1037                         "%s:hid_hw_start returned error\n", __func__);
1038                 goto hid_hw_start_fail;
1039         }
1040
1041         retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
1042         if (retval < 0) {
1043                 dev_err(&hdev->dev,
1044                         "%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
1045                         __func__, retval);
1046                 goto switch_to_dj_mode_fail;
1047         }
1048
1049         /* This is enabling the polling urb on the IN endpoint */
1050         retval = hid_hw_open(hdev);
1051         if (retval < 0) {
1052                 dev_err(&hdev->dev, "%s:hid_hw_open returned error:%d\n",
1053                         __func__, retval);
1054                 goto llopen_failed;
1055         }
1056
1057         /* Allow incoming packets to arrive: */
1058         hid_device_io_start(hdev);
1059
1060         retval = logi_dj_recv_query_paired_devices(djrcv_dev);
1061         if (retval < 0) {
1062                 dev_err(&hdev->dev, "%s:logi_dj_recv_query_paired_devices "
1063                         "error:%d\n", __func__, retval);
1064                 goto logi_dj_recv_query_paired_devices_failed;
1065         }
1066
1067         return retval;
1068
1069 logi_dj_recv_query_paired_devices_failed:
1070         hid_hw_close(hdev);
1071
1072 llopen_failed:
1073 switch_to_dj_mode_fail:
1074         hid_hw_stop(hdev);
1075
1076 hid_hw_start_fail:
1077 hid_parse_fail:
1078         kfifo_free(&djrcv_dev->notif_fifo);
1079         kfree(djrcv_dev);
1080         hid_set_drvdata(hdev, NULL);
1081         return retval;
1082
1083 }
1084
1085 #ifdef CONFIG_PM
1086 static int logi_dj_reset_resume(struct hid_device *hdev)
1087 {
1088         int retval;
1089         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
1090
1091         retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
1092         if (retval < 0) {
1093                 dev_err(&hdev->dev,
1094                         "%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
1095                         __func__, retval);
1096         }
1097
1098         return 0;
1099 }
1100 #endif
1101
1102 static void logi_dj_remove(struct hid_device *hdev)
1103 {
1104         struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
1105         struct dj_device *dj_dev;
1106         int i;
1107
1108         dbg_hid("%s\n", __func__);
1109
1110         cancel_work_sync(&djrcv_dev->work);
1111
1112         hid_hw_close(hdev);
1113         hid_hw_stop(hdev);
1114
1115         /* I suppose that at this point the only context that can access
1116          * the djrecv_data is this thread as the work item is guaranteed to
1117          * have finished and no more raw_event callbacks should arrive after
1118          * the remove callback was triggered so no locks are put around the
1119          * code below */
1120         for (i = 0; i < (DJ_MAX_PAIRED_DEVICES + DJ_DEVICE_INDEX_MIN); i++) {
1121                 dj_dev = djrcv_dev->paired_dj_devices[i];
1122                 if (dj_dev != NULL) {
1123                         hid_destroy_device(dj_dev->hdev);
1124                         kfree(dj_dev);
1125                         djrcv_dev->paired_dj_devices[i] = NULL;
1126                 }
1127         }
1128
1129         kfifo_free(&djrcv_dev->notif_fifo);
1130         kfree(djrcv_dev);
1131         hid_set_drvdata(hdev, NULL);
1132 }
1133
1134 static const struct hid_device_id logi_dj_receivers[] = {
1135         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
1136                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
1137         {HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
1138                 USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
1139         {}
1140 };
1141
1142 MODULE_DEVICE_TABLE(hid, logi_dj_receivers);
1143
1144 static struct hid_driver logi_djreceiver_driver = {
1145         .name = "logitech-djreceiver",
1146         .id_table = logi_dj_receivers,
1147         .probe = logi_dj_probe,
1148         .remove = logi_dj_remove,
1149         .raw_event = logi_dj_raw_event,
1150 #ifdef CONFIG_PM
1151         .reset_resume = logi_dj_reset_resume,
1152 #endif
1153 };
1154
1155 module_hid_driver(logi_djreceiver_driver);
1156
1157 MODULE_LICENSE("GPL");
1158 MODULE_AUTHOR("Logitech");
1159 MODULE_AUTHOR("Nestor Lopez Casado");
1160 MODULE_AUTHOR("nlopezcasad@logitech.com");