Merge tag '5.15-rc-ksmbd-part2' of git://git.samba.org/ksmbd
[linux-2.6-microblaze.git] / drivers / hid / 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 <asm/unaligned.h>
20 #include <asm/byteorder.h>
21
22 #include <linux/hid.h>
23
24 static struct hid_driver hid_generic;
25
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
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
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");