hid-generic.c

 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 int hid_generic_reset_resume(struct hid_device *hdev)
74{
75	if (hdev->claimed & HID_CLAIMED_INPUT)
76		hidinput_reset_resume(hdev);
77
78	return 0;
79}
80
81static const struct hid_device_id hid_table[] = {
82	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, HID_ANY_ID, HID_ANY_ID) },
83	{ }
84};
85MODULE_DEVICE_TABLE(hid, hid_table);
86
87static struct hid_driver hid_generic = {
88	.name = "hid-generic",
89	.id_table = hid_table,
90	.match = hid_generic_match,
91	.probe = hid_generic_probe,
92	.reset_resume = hid_generic_reset_resume,
93};
94module_hid_driver(hid_generic);
95
96MODULE_AUTHOR("Henrik Rydberg");
97MODULE_DESCRIPTION("HID generic driver");
98MODULE_LICENSE("GPL");