drivers/hid/hid-belkin.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  HID driver for some belkin "special" devices
   4  *
   5  *  Copyright (c) 1999 Andreas Gal
   6  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   7  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   8  *  Copyright (c) 2006-2007 Jiri Kosina
   9  *  Copyright (c) 2008 Jiri Slaby
  10  */
  11
  12 /*
  13  */
  14
  15 #include <linux/device.h>
  16 #include <linux/hid.h>
  17 #include <linux/module.h>
  18
  19 #include "hid-ids.h"
  20
  21 #define BELKIN_HIDDEV   0x01
  22 #define BELKIN_WKBD     0x02
  23
  24 #define belkin_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
  25                                         EV_KEY, (c))
  26 static int belkin_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  27                 struct hid_field *field, struct hid_usage *usage,
  28                 unsigned long **bit, int *max)
  29 {
  30         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  31
  32         if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER ||
  33                         !(quirks & BELKIN_WKBD))
  34                 return 0;
  35
  36         switch (usage->hid & HID_USAGE) {
  37         case 0x03a: belkin_map_key_clear(KEY_SOUND);            break;
  38         case 0x03b: belkin_map_key_clear(KEY_CAMERA);           break;
  39         case 0x03c: belkin_map_key_clear(KEY_DOCUMENTS);        break;
  40         default:
  41                 return 0;
  42         }
  43         return 1;
  44 }
  45
  46 static int belkin_probe(struct hid_device *hdev, const struct hid_device_id *id)
  47 {
  48         unsigned long quirks = id->driver_data;
  49         int ret;
  50
  51         hid_set_drvdata(hdev, (void *)quirks);
  52
  53         ret = hid_parse(hdev);
  54         if (ret) {
  55                 hid_err(hdev, "parse failed\n");
  56                 goto err_free;
  57         }
  58
  59         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT |
  60                 ((quirks & BELKIN_HIDDEV) ? HID_CONNECT_HIDDEV_FORCE : 0));
  61         if (ret) {
  62                 hid_err(hdev, "hw start failed\n");
  63                 goto err_free;
  64         }
  65
  66         return 0;
  67 err_free:
  68         return ret;
  69 }
  70
  71 static const struct hid_device_id belkin_devices[] = {
  72         { HID_USB_DEVICE(USB_VENDOR_ID_BELKIN, USB_DEVICE_ID_FLIP_KVM),
  73                 .driver_data = BELKIN_HIDDEV },
  74         { HID_USB_DEVICE(USB_VENDOR_ID_LABTEC, USB_DEVICE_ID_LABTEC_WIRELESS_KEYBOARD),
  75                 .driver_data = BELKIN_WKBD },
  76         { }
  77 };
  78 MODULE_DEVICE_TABLE(hid, belkin_devices);
  79
  80 static struct hid_driver belkin_driver = {
  81         .name = "belkin",
  82         .id_table = belkin_devices,
  83         .input_mapping = belkin_input_mapping,
  84         .probe = belkin_probe,
  85 };
  86 module_hid_driver(belkin_driver);
  87
  88 MODULE_LICENSE("GPL");