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
24 static struct hid_driver hid_generic;
25
__check_hid_generic(struct device_driver * drv,void * data)26 static 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
hid_generic_match(struct hid_device * hdev,bool ignore_special_driver)37 static 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_HAVE_SPECIAL_DRIVER)
44 return false;
45
46 /*
47 * If any other driver wants the device, leave the device to this other
48 * driver.
49 */
50 if (bus_for_each_drv(&hid_bus_type, NULL, hdev, __check_hid_generic))
51 return false;
52
53 return true;
54 }
55
hid_generic_probe(struct hid_device * hdev,const struct hid_device_id * id)56 static int hid_generic_probe(struct hid_device *hdev,
57 const struct hid_device_id *id)
58 {
59 int ret;
60
61 hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
62
63 ret = hid_parse(hdev);
64 if (ret)
65 return ret;
66
67 return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
68 }
69
70 static const struct hid_device_id hid_table[] = {
71 { HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, HID_ANY_ID, HID_ANY_ID) },
72 { }
73 };
74 MODULE_DEVICE_TABLE(hid, hid_table);
75
76 static struct hid_driver hid_generic = {
77 .name = "hid-generic",
78 .id_table = hid_table,
79 .match = hid_generic_match,
80 .probe = hid_generic_probe,
81 };
82 module_hid_driver(hid_generic);
83
84 MODULE_AUTHOR("Henrik Rydberg");
85 MODULE_DESCRIPTION("HID generic driver");
86 MODULE_LICENSE("GPL");
87