drivers/hid/hid-glorious.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  USB HID driver for Glorious PC Gaming Race
   4  *  Glorious Model O, O- and D mice.
   5  *
   6  *  Copyright (c) 2020 Samuel Čavoj <sammko@sammserver.com>
   7  */
   8
   9 /*
  10  */
  11
  12 #include <linux/hid.h>
  13 #include <linux/module.h>
  14
  15 #include "hid-ids.h"
  16
  17 MODULE_AUTHOR("Samuel Čavoj <sammko@sammserver.com>");
  18 MODULE_DESCRIPTION("HID driver for Glorious PC Gaming Race mice");
  19
  20 /*
  21  * Glorious Model O and O- specify the const flag in the consumer input
  22  * report descriptor, which leads to inputs being ignored. Fix this
  23  * by patching the descriptor.
  24  */
  25 static __u8 *glorious_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  26                 unsigned int *rsize)
  27 {
  28         if (*rsize == 213 &&
  29                 rdesc[84] == 129 && rdesc[112] == 129 && rdesc[140] == 129 &&
  30                 rdesc[85] == 3   && rdesc[113] == 3   && rdesc[141] == 3) {
  31                 hid_info(hdev, "patching Glorious Model O consumer control report descriptor\n");
  32                 rdesc[85] = rdesc[113] = rdesc[141] = \
  33                         HID_MAIN_ITEM_VARIABLE | HID_MAIN_ITEM_RELATIVE;
  34         }
  35         return rdesc;
  36 }
  37
  38 static void glorious_update_name(struct hid_device *hdev)
  39 {
  40         const char *model = "Device";
  41
  42         switch (hdev->product) {
  43         case USB_DEVICE_ID_GLORIOUS_MODEL_O:
  44                 model = "Model O"; break;
  45         case USB_DEVICE_ID_GLORIOUS_MODEL_D:
  46                 model = "Model D"; break;
  47         }
  48
  49         snprintf(hdev->name, sizeof(hdev->name), "%s %s", "Glorious", model);
  50 }
  51
  52 static int glorious_probe(struct hid_device *hdev,
  53                 const struct hid_device_id *id)
  54 {
  55         int ret;
  56
  57         hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
  58
  59         ret = hid_parse(hdev);
  60         if (ret)
  61                 return ret;
  62
  63         glorious_update_name(hdev);
  64
  65         return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  66 }
  67
  68 static const struct hid_device_id glorious_devices[] = {
  69         { HID_USB_DEVICE(USB_VENDOR_ID_GLORIOUS,
  70                 USB_DEVICE_ID_GLORIOUS_MODEL_O) },
  71         { HID_USB_DEVICE(USB_VENDOR_ID_GLORIOUS,
  72                 USB_DEVICE_ID_GLORIOUS_MODEL_D) },
  73         { }
  74 };
  75 MODULE_DEVICE_TABLE(hid, glorious_devices);
  76
  77 static struct hid_driver glorious_driver = {
  78         .name = "glorious",
  79         .id_table = glorious_devices,
  80         .probe = glorious_probe,
  81         .report_fixup = glorious_report_fixup
  82 };
  83
  84 module_hid_driver(glorious_driver);
  85
  86 MODULE_LICENSE("GPL");