drivers/hid/hid-elecom.c

   1 /*
   2  *  HID driver for ELECOM devices.
   3  *  Copyright (c) 2010 Richard Nauber <Richard.Nauber@gmail.com>
   4  *  Copyright (c) 2016 Yuxuan Shui <yshuiv7@gmail.com>
   5  *  Copyright (c) 2017 Diego Elio Pettenò <flameeyes@flameeyes.eu>
   6  *  Copyright (c) 2017 Alex Manoussakis <amanou@gnu.org>
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  */
  15
  16 #include <linux/device.h>
  17 #include <linux/hid.h>
  18 #include <linux/module.h>
  19
  20 #include "hid-ids.h"
  21
  22 static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  23                 unsigned int *rsize)
  24 {
  25         switch (hdev->product) {
  26         case USB_DEVICE_ID_ELECOM_BM084:
  27                 /* The BM084 Bluetooth mouse includes a non-existing horizontal
  28                  * wheel in the HID descriptor. */
  29                 if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) {
  30                         hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n");
  31                         rdesc[47] = 0x00;
  32                 }
  33                 break;
  34         case USB_DEVICE_ID_ELECOM_DEFT_WIRED:
  35         case USB_DEVICE_ID_ELECOM_DEFT_WIRELESS:
  36         case USB_DEVICE_ID_ELECOM_HUGE_WIRED:
  37         case USB_DEVICE_ID_ELECOM_HUGE_WIRELESS:
  38                 /* The DEFT/HUGE trackball has eight buttons, but its descriptor
  39                  * only reports five, disabling the three Fn buttons on the top
  40                  * of the mouse.
  41                  *
  42                  * Apply the following diff to the descriptor:
  43                  *
  44                  * Collection (Physical),              Collection (Physical),
  45                  *     Report ID (1),                      Report ID (1),
  46                  *     Report Count (5),           ->      Report Count (8),
  47                  *     Report Size (1),                    Report Size (1),
  48                  *     Usage Page (Button),                Usage Page (Button),
  49                  *     Usage Minimum (01h),                Usage Minimum (01h),
  50                  *     Usage Maximum (05h),        ->      Usage Maximum (08h),
  51                  *     Logical Minimum (0),                Logical Minimum (0),
  52                  *     Logical Maximum (1),                Logical Maximum (1),
  53                  *     Input (Variable),                   Input (Variable),
  54                  *     Report Count (1),           ->      Report Count (0),
  55                  *     Report Size (3),                    Report Size (3),
  56                  *     Input (Constant),                   Input (Constant),
  57                  *     Report Size (16),                   Report Size (16),
  58                  *     Report Count (2),                   Report Count (2),
  59                  *     Usage Page (Desktop),               Usage Page (Desktop),
  60                  *     Usage (X),                          Usage (X),
  61                  *     Usage (Y),                          Usage (Y),
  62                  *     Logical Minimum (-32768),           Logical Minimum (-32768),
  63                  *     Logical Maximum (32767),            Logical Maximum (32767),
  64                  *     Input (Variable, Relative),         Input (Variable, Relative),
  65                  * End Collection,                     End Collection,
  66                  */
  67                 if (*rsize == 213 && rdesc[13] == 5 && rdesc[21] == 5) {
  68                         hid_info(hdev, "Fixing up Elecom DEFT/HUGE Fn buttons\n");
  69                         rdesc[13] = 8; /* Button/Variable Report Count */
  70                         rdesc[21] = 8; /* Button/Variable Usage Maximum */
  71                         rdesc[29] = 0; /* Button/Constant Report Count */
  72                 }
  73                 break;
  74         }
  75         return rdesc;
  76 }
  77
  78 static const struct hid_device_id elecom_devices[] = {
  79         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) },
  80         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRED) },
  81         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRELESS) },
  82         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_HUGE_WIRED) },
  83         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_HUGE_WIRELESS) },
  84         { }
  85 };
  86 MODULE_DEVICE_TABLE(hid, elecom_devices);
  87
  88 static struct hid_driver elecom_driver = {
  89         .name = "elecom",
  90         .id_table = elecom_devices,
  91         .report_fixup = elecom_report_fixup
  92 };
  93 module_hid_driver(elecom_driver);
  94
  95 MODULE_LICENSE("GPL");