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(bus: &hid_bus_type, NULL, data: hdev, fn: __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");
90