1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * HID driver for Gembird Joypad, "PC Game Controller" |
4 | * |
5 | * Copyright (c) 2015 Red Hat, Inc |
6 | * Copyright (c) 2015 Benjamin Tissoires |
7 | */ |
8 | |
9 | /* |
10 | */ |
11 | |
12 | #include <linux/device.h> |
13 | #include <linux/hid.h> |
14 | #include <linux/module.h> |
15 | |
16 | #include "hid-ids.h" |
17 | |
18 | #define GEMBIRD_START_FAULTY_RDESC 8 |
19 | |
20 | static const __u8 gembird_jpd_faulty_rdesc[] = { |
21 | 0x75, 0x08, /* Report Size (8) */ |
22 | 0x95, 0x05, /* Report Count (5) */ |
23 | 0x15, 0x00, /* Logical Minimum (0) */ |
24 | 0x26, 0xff, 0x00, /* Logical Maximum (255) */ |
25 | 0x35, 0x00, /* Physical Minimum (0) */ |
26 | 0x46, 0xff, 0x00, /* Physical Maximum (255) */ |
27 | 0x09, 0x30, /* Usage (X) */ |
28 | 0x09, 0x31, /* Usage (Y) */ |
29 | 0x09, 0x32, /* Usage (Z) */ |
30 | 0x09, 0x32, /* Usage (Z) */ |
31 | 0x09, 0x35, /* Usage (Rz) */ |
32 | 0x81, 0x02, /* Input (Data,Var,Abs) */ |
33 | }; |
34 | |
35 | /* |
36 | * we fix the report descriptor by: |
37 | * - marking the first Z axis as constant (so it is ignored by HID) |
38 | * - assign the original second Z to Rx |
39 | * - assign the original Rz to Ry |
40 | */ |
41 | static const __u8 gembird_jpd_fixed_rdesc[] = { |
42 | 0x75, 0x08, /* Report Size (8) */ |
43 | 0x95, 0x02, /* Report Count (2) */ |
44 | 0x15, 0x00, /* Logical Minimum (0) */ |
45 | 0x26, 0xff, 0x00, /* Logical Maximum (255) */ |
46 | 0x35, 0x00, /* Physical Minimum (0) */ |
47 | 0x46, 0xff, 0x00, /* Physical Maximum (255) */ |
48 | 0x09, 0x30, /* Usage (X) */ |
49 | 0x09, 0x31, /* Usage (Y) */ |
50 | 0x81, 0x02, /* Input (Data,Var,Abs) */ |
51 | 0x95, 0x01, /* Report Count (1) */ |
52 | 0x09, 0x32, /* Usage (Z) */ |
53 | 0x81, 0x01, /* Input (Cnst,Arr,Abs) */ |
54 | 0x95, 0x02, /* Report Count (2) */ |
55 | 0x09, 0x33, /* Usage (Rx) */ |
56 | 0x09, 0x34, /* Usage (Ry) */ |
57 | 0x81, 0x02, /* Input (Data,Var,Abs) */ |
58 | }; |
59 | |
60 | static __u8 *gembird_report_fixup(struct hid_device *hdev, __u8 *rdesc, |
61 | unsigned int *rsize) |
62 | { |
63 | __u8 *new_rdesc; |
64 | /* delta_size is > 0 */ |
65 | size_t delta_size = sizeof(gembird_jpd_fixed_rdesc) - |
66 | sizeof(gembird_jpd_faulty_rdesc); |
67 | size_t new_size = *rsize + delta_size; |
68 | |
69 | if (*rsize >= 31 && !memcmp(p: &rdesc[GEMBIRD_START_FAULTY_RDESC], |
70 | q: gembird_jpd_faulty_rdesc, |
71 | size: sizeof(gembird_jpd_faulty_rdesc))) { |
72 | new_rdesc = devm_kzalloc(dev: &hdev->dev, size: new_size, GFP_KERNEL); |
73 | if (new_rdesc == NULL) |
74 | return rdesc; |
75 | |
76 | dev_info(&hdev->dev, |
77 | "fixing Gembird JPD-DualForce 2 report descriptor.\n" ); |
78 | |
79 | /* start by copying the end of the rdesc */ |
80 | memcpy(new_rdesc + delta_size, rdesc, *rsize); |
81 | |
82 | /* add the correct beginning */ |
83 | memcpy(new_rdesc, rdesc, GEMBIRD_START_FAULTY_RDESC); |
84 | |
85 | /* replace the faulty part with the fixed one */ |
86 | memcpy(new_rdesc + GEMBIRD_START_FAULTY_RDESC, |
87 | gembird_jpd_fixed_rdesc, |
88 | sizeof(gembird_jpd_fixed_rdesc)); |
89 | |
90 | *rsize = new_size; |
91 | rdesc = new_rdesc; |
92 | } |
93 | |
94 | return rdesc; |
95 | } |
96 | |
97 | static const struct hid_device_id gembird_devices[] = { |
98 | { HID_USB_DEVICE(USB_VENDOR_ID_GEMBIRD, |
99 | USB_DEVICE_ID_GEMBIRD_JPD_DUALFORCE2) }, |
100 | { } |
101 | }; |
102 | MODULE_DEVICE_TABLE(hid, gembird_devices); |
103 | |
104 | static struct hid_driver gembird_driver = { |
105 | .name = "gembird" , |
106 | .id_table = gembird_devices, |
107 | .report_fixup = gembird_report_fixup, |
108 | }; |
109 | module_hid_driver(gembird_driver); |
110 | |
111 | MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>" ); |
112 | MODULE_DESCRIPTION("HID Gembird joypad driver" ); |
113 | MODULE_LICENSE("GPL" ); |
114 | |