1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * HID driver for some a4tech "special" devices |
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) 2006-2007 Jiri Kosina |
9 | * Copyright (c) 2008 Jiri Slaby |
10 | */ |
11 | |
12 | /* |
13 | */ |
14 | |
15 | #include <linux/device.h> |
16 | #include <linux/input.h> |
17 | #include <linux/hid.h> |
18 | #include <linux/module.h> |
19 | #include <linux/slab.h> |
20 | |
21 | #include "hid-ids.h" |
22 | |
23 | #define A4_2WHEEL_MOUSE_HACK_7 0x01 |
24 | #define A4_2WHEEL_MOUSE_HACK_B8 0x02 |
25 | |
26 | #define A4_WHEEL_ORIENTATION (HID_UP_GENDESK | 0x000000b8) |
27 | |
28 | struct a4tech_sc { |
29 | unsigned long quirks; |
30 | unsigned int hw_wheel; |
31 | __s32 delayed_value; |
32 | }; |
33 | |
34 | static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi, |
35 | struct hid_field *field, struct hid_usage *usage, |
36 | unsigned long **bit, int *max) |
37 | { |
38 | struct a4tech_sc *a4 = hid_get_drvdata(hdev); |
39 | |
40 | if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 && |
41 | usage->hid == A4_WHEEL_ORIENTATION) { |
42 | /* |
43 | * We do not want to have this usage mapped to anything as it's |
44 | * nonstandard and doesn't really behave like an HID report. |
45 | * It's only selecting the orientation (vertical/horizontal) of |
46 | * the previous mouse wheel report. The input_events will be |
47 | * generated once both reports are recorded in a4_event(). |
48 | */ |
49 | return -1; |
50 | } |
51 | |
52 | return 0; |
53 | |
54 | } |
55 | |
56 | static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi, |
57 | struct hid_field *field, struct hid_usage *usage, |
58 | unsigned long **bit, int *max) |
59 | { |
60 | struct a4tech_sc *a4 = hid_get_drvdata(hdev); |
61 | |
62 | if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) { |
63 | set_bit(REL_HWHEEL, addr: *bit); |
64 | set_bit(REL_HWHEEL_HI_RES, addr: *bit); |
65 | } |
66 | |
67 | if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) |
68 | return -1; |
69 | |
70 | return 0; |
71 | } |
72 | |
73 | static int a4_event(struct hid_device *hdev, struct hid_field *field, |
74 | struct hid_usage *usage, __s32 value) |
75 | { |
76 | struct a4tech_sc *a4 = hid_get_drvdata(hdev); |
77 | struct input_dev *input; |
78 | |
79 | if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput) |
80 | return 0; |
81 | |
82 | input = field->hidinput->input; |
83 | |
84 | if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) { |
85 | if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) { |
86 | a4->delayed_value = value; |
87 | return 1; |
88 | } |
89 | |
90 | if (usage->hid == A4_WHEEL_ORIENTATION) { |
91 | input_event(dev: input, EV_REL, code: value ? REL_HWHEEL : |
92 | REL_WHEEL, value: a4->delayed_value); |
93 | input_event(dev: input, EV_REL, code: value ? REL_HWHEEL_HI_RES : |
94 | REL_WHEEL_HI_RES, value: a4->delayed_value * 120); |
95 | return 1; |
96 | } |
97 | } |
98 | |
99 | if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) { |
100 | a4->hw_wheel = !!value; |
101 | return 1; |
102 | } |
103 | |
104 | if (usage->code == REL_WHEEL_HI_RES && a4->hw_wheel) { |
105 | input_event(dev: input, type: usage->type, REL_HWHEEL, value); |
106 | input_event(dev: input, type: usage->type, REL_HWHEEL_HI_RES, value: value * 120); |
107 | return 1; |
108 | } |
109 | |
110 | return 0; |
111 | } |
112 | |
113 | static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id) |
114 | { |
115 | struct a4tech_sc *a4; |
116 | int ret; |
117 | |
118 | a4 = devm_kzalloc(dev: &hdev->dev, size: sizeof(*a4), GFP_KERNEL); |
119 | if (a4 == NULL) { |
120 | hid_err(hdev, "can't alloc device descriptor\n" ); |
121 | return -ENOMEM; |
122 | } |
123 | |
124 | a4->quirks = id->driver_data; |
125 | |
126 | hid_set_drvdata(hdev, data: a4); |
127 | |
128 | ret = hid_parse(hdev); |
129 | if (ret) { |
130 | hid_err(hdev, "parse failed\n" ); |
131 | return ret; |
132 | } |
133 | |
134 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); |
135 | if (ret) { |
136 | hid_err(hdev, "hw start failed\n" ); |
137 | return ret; |
138 | } |
139 | |
140 | return 0; |
141 | } |
142 | |
143 | static const struct hid_device_id a4_devices[] = { |
144 | { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU), |
145 | .driver_data = A4_2WHEEL_MOUSE_HACK_7 }, |
146 | { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D), |
147 | .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, |
148 | { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649), |
149 | .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, |
150 | { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_NB_95), |
151 | .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, |
152 | { } |
153 | }; |
154 | MODULE_DEVICE_TABLE(hid, a4_devices); |
155 | |
156 | static struct hid_driver a4_driver = { |
157 | .name = "a4tech" , |
158 | .id_table = a4_devices, |
159 | .input_mapping = a4_input_mapping, |
160 | .input_mapped = a4_input_mapped, |
161 | .event = a4_event, |
162 | .probe = a4_probe, |
163 | }; |
164 | module_hid_driver(a4_driver); |
165 | |
166 | MODULE_LICENSE("GPL" ); |
167 | |