Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
64b386ea | 2 | /* |
ac58eec2 TK |
3 | * HID driver for ELECOM devices: |
4 | * - BM084 Bluetooth Mouse | |
fbb77e88 | 5 | * - EX-G Trackballs (M-XT3DRBK, M-XT3URBK, M-XT4DRBK) |
79837ede TK |
6 | * - DEFT Trackballs (M-DT1DRBK, M-DT1URBK, M-DT2DRBK, M-DT2URBK) |
7 | * - HUGE Trackballs (M-HT1DRBK, M-HT1URBK) | |
ac58eec2 | 8 | * |
64b386ea | 9 | * Copyright (c) 2010 Richard Nauber <Richard.Nauber@gmail.com> |
0bb7a37f DEP |
10 | * Copyright (c) 2016 Yuxuan Shui <yshuiv7@gmail.com> |
11 | * Copyright (c) 2017 Diego Elio Pettenò <flameeyes@flameeyes.eu> | |
a0933a45 | 12 | * Copyright (c) 2017 Alex Manoussakis <amanou@gnu.org> |
ac58eec2 | 13 | * Copyright (c) 2017 Tomasz Kramkowski <tk@the-tk.com> |
68d09380 | 14 | * Copyright (c) 2020 YOSHIOKA Takuma <lo48576@hard-wi.red> |
64b386ea RN |
15 | */ |
16 | ||
17 | /* | |
64b386ea RN |
18 | */ |
19 | ||
20 | #include <linux/device.h> | |
21 | #include <linux/hid.h> | |
22 | #include <linux/module.h> | |
23 | ||
24 | #include "hid-ids.h" | |
25 | ||
ac58eec2 TK |
26 | /* |
27 | * Certain ELECOM mice misreport their button count meaning that they only work | |
28 | * correctly with the ELECOM mouse assistant software which is unavailable for | |
29 | * Linux. A four extra INPUT reports and a FEATURE report are described by the | |
30 | * report descriptor but it does not appear that these enable software to | |
31 | * control what the extra buttons map to. The only simple and straightforward | |
32 | * solution seems to involve fixing up the report descriptor. | |
ac58eec2 TK |
33 | */ |
34 | #define MOUSE_BUTTONS_MAX 8 | |
35 | static void mouse_button_fixup(struct hid_device *hdev, | |
36 | __u8 *rdesc, unsigned int rsize, | |
68d09380 YT |
37 | unsigned int button_bit_count, |
38 | unsigned int padding_bit, | |
39 | unsigned int button_report_size, | |
40 | unsigned int button_usage_maximum, | |
ac58eec2 TK |
41 | int nbuttons) |
42 | { | |
68d09380 YT |
43 | if (rsize < 32 || rdesc[button_bit_count] != 0x95 || |
44 | rdesc[button_report_size] != 0x75 || | |
45 | rdesc[button_report_size + 1] != 0x01 || | |
46 | rdesc[button_usage_maximum] != 0x29 || rdesc[padding_bit] != 0x75) | |
ac58eec2 TK |
47 | return; |
48 | hid_info(hdev, "Fixing up Elecom mouse button count\n"); | |
49 | nbuttons = clamp(nbuttons, 0, MOUSE_BUTTONS_MAX); | |
68d09380 YT |
50 | rdesc[button_bit_count + 1] = nbuttons; |
51 | rdesc[button_usage_maximum + 1] = nbuttons; | |
52 | rdesc[padding_bit + 1] = MOUSE_BUTTONS_MAX - nbuttons; | |
ac58eec2 TK |
53 | } |
54 | ||
73e4008d NK |
55 | static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc, |
56 | unsigned int *rsize) | |
64b386ea | 57 | { |
0bb7a37f DEP |
58 | switch (hdev->product) { |
59 | case USB_DEVICE_ID_ELECOM_BM084: | |
60 | /* The BM084 Bluetooth mouse includes a non-existing horizontal | |
61 | * wheel in the HID descriptor. */ | |
62 | if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) { | |
63 | hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n"); | |
64 | rdesc[47] = 0x00; | |
65 | } | |
66 | break; | |
55633e68 YT |
67 | case USB_DEVICE_ID_ELECOM_M_XGL20DLBK: |
68 | /* | |
69 | * Report descriptor format: | |
70 | * 20: button bit count | |
71 | * 28: padding bit count | |
72 | * 22: button report size | |
73 | * 14: button usage maximum | |
74 | */ | |
75 | mouse_button_fixup(hdev, rdesc, *rsize, 20, 28, 22, 14, 8); | |
76 | break; | |
79837ede TK |
77 | case USB_DEVICE_ID_ELECOM_M_XT3URBK: |
78 | case USB_DEVICE_ID_ELECOM_M_XT3DRBK: | |
fbb77e88 | 79 | case USB_DEVICE_ID_ELECOM_M_XT4DRBK: |
68d09380 YT |
80 | /* |
81 | * Report descriptor format: | |
82 | * 12: button bit count | |
83 | * 30: padding bit count | |
84 | * 14: button report size | |
85 | * 20: button usage maximum | |
86 | */ | |
87 | mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 6); | |
ac58eec2 | 88 | break; |
79837ede TK |
89 | case USB_DEVICE_ID_ELECOM_M_DT1URBK: |
90 | case USB_DEVICE_ID_ELECOM_M_DT1DRBK: | |
91 | case USB_DEVICE_ID_ELECOM_M_HT1URBK: | |
92 | case USB_DEVICE_ID_ELECOM_M_HT1DRBK: | |
68d09380 YT |
93 | /* |
94 | * Report descriptor format: | |
95 | * 12: button bit count | |
96 | * 30: padding bit count | |
97 | * 14: button report size | |
98 | * 20: button usage maximum | |
99 | */ | |
100 | mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 8); | |
0bb7a37f | 101 | break; |
64b386ea | 102 | } |
636a89d4 | 103 | return rdesc; |
64b386ea RN |
104 | } |
105 | ||
106 | static const struct hid_device_id elecom_devices[] = { | |
0bb7a37f | 107 | { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) }, |
55633e68 | 108 | { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XGL20DLBK) }, |
79837ede TK |
109 | { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3URBK) }, |
110 | { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3DRBK) }, | |
fbb77e88 | 111 | { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT4DRBK) }, |
79837ede TK |
112 | { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1URBK) }, |
113 | { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1DRBK) }, | |
114 | { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1URBK) }, | |
115 | { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1DRBK) }, | |
64b386ea RN |
116 | { } |
117 | }; | |
118 | MODULE_DEVICE_TABLE(hid, elecom_devices); | |
119 | ||
120 | static struct hid_driver elecom_driver = { | |
121 | .name = "elecom", | |
122 | .id_table = elecom_devices, | |
123 | .report_fixup = elecom_report_fixup | |
124 | }; | |
f425458e | 125 | module_hid_driver(elecom_driver); |
64b386ea | 126 | |
64b386ea | 127 | MODULE_LICENSE("GPL"); |