drivers/hid/hid-kensington.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  HID driver for Kensigton Slimblade Trackball
   4  *
   5  *  Copyright (c) 2009 Jiri Kosina
   6  */
   7
   8 /*
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/input.h>
  13 #include <linux/hid.h>
  14 #include <linux/module.h>
  15
  16 #include "hid-ids.h"
  17
  18 #define ks_map_key(c)   hid_map_usage(hi, usage, bit, max, EV_KEY, (c))
  19
  20 static int ks_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  21                 struct hid_field *field, struct hid_usage *usage,
  22                 unsigned long **bit, int *max)
  23 {
  24         if ((usage->hid & HID_USAGE_PAGE) != HID_UP_MSVENDOR)
  25                 return 0;
  26
  27         switch (usage->hid & HID_USAGE) {
  28         case 0x01: ks_map_key(BTN_MIDDLE);      break;
  29         case 0x02: ks_map_key(BTN_SIDE);        break;
  30         default:
  31                 return 0;
  32         }
  33         return 1;
  34 }
  35
  36 static const struct hid_device_id ks_devices[] = {
  37         { HID_USB_DEVICE(USB_VENDOR_ID_KENSINGTON, USB_DEVICE_ID_KS_SLIMBLADE) },
  38         { }
  39 };
  40 MODULE_DEVICE_TABLE(hid, ks_devices);
  41
  42 static struct hid_driver ks_driver = {
  43         .name = "kensington",
  44         .id_table = ks_devices,
  45         .input_mapping = ks_input_mapping,
  46 };
  47 module_hid_driver(ks_driver);
  48
  49 MODULE_LICENSE("GPL");