cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hid-belkin.c (2194B)

      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))
     26static 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
     46static 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;
     67err_free:
     68	return ret;
     69}
     70
     71static 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};
     78MODULE_DEVICE_TABLE(hid, belkin_devices);
     79
     80static struct hid_driver belkin_driver = {
     81	.name = "belkin",
     82	.id_table = belkin_devices,
     83	.input_mapping = belkin_input_mapping,
     84	.probe = belkin_probe,
     85};
     86module_hid_driver(belkin_driver);
     87
     88MODULE_LICENSE("GPL");