1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 *  HID support for Linux
 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) 2007-2008 Oliver Neukum
 9 *  Copyright (c) 2006-2012 Jiri Kosina
10 *  Copyright (c) 2012 Henrik Rydberg
11 */
12
13/*
14 */
15
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/kernel.h>
19#include <linux/unaligned.h>
20#include <asm/byteorder.h>
21
22#include <linux/hid.h>
23
24static struct hid_driver hid_generic;
25
26static int __check_hid_generic(struct device_driver *drv, void *data)
27{
28	struct hid_driver *hdrv = to_hid_driver(drv);
29	struct hid_device *hdev = data;
30
31	if (hdrv == &hid_generic)
32		return 0;
33
34	return hid_match_device(hdev, hdrv) != NULL;
35}
36
37static bool hid_generic_match(struct hid_device *hdev,
38			      bool ignore_special_driver)
39{
40	if (ignore_special_driver)
41		return true;
42
43	if (hdev->quirks & HID_QUIRK_IGNORE_SPECIAL_DRIVER)
44		return true;
45
46	if (hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)
47		return false;
48
49	/*
50	 * If any other driver wants the device, leave the device to this other
51	 * driver.
52	 */
53	if (bus_for_each_drv(&hid_bus_type, NULL, hdev, __check_hid_generic))
54		return false;
55
56	return true;
57}
58
59static int hid_generic_probe(struct hid_device *hdev,
60			     const struct hid_device_id *id)
61{
62	int ret;
63
64	hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
65
66	ret = hid_parse(hdev);
67	if (ret)
68		return ret;
69
70	return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
71}
72
73static const struct hid_device_id hid_table[] = {
74	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, HID_ANY_ID, HID_ANY_ID) },
75	{ }
76};
77MODULE_DEVICE_TABLE(hid, hid_table);
78
79static struct hid_driver hid_generic = {
80	.name = "hid-generic",
81	.id_table = hid_table,
82	.match = hid_generic_match,
83	.probe = hid_generic_probe,
84};
85module_hid_driver(hid_generic);
86
87MODULE_AUTHOR("Henrik Rydberg");
88MODULE_DESCRIPTION("HID generic driver");
89MODULE_LICENSE("GPL");