Line data Source code
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 0 : 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 0 : struct a4tech_sc *a4 = hid_get_drvdata(hdev);
39 :
40 0 : if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
41 0 : 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 0 : return 0;
53 :
54 : }
55 :
56 0 : 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 0 : struct a4tech_sc *a4 = hid_get_drvdata(hdev);
61 :
62 0 : if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
63 0 : set_bit(REL_HWHEEL, *bit);
64 0 : set_bit(REL_HWHEEL_HI_RES, *bit);
65 : }
66 :
67 0 : if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
68 : return -1;
69 :
70 0 : return 0;
71 : }
72 :
73 0 : static int a4_event(struct hid_device *hdev, struct hid_field *field,
74 : struct hid_usage *usage, __s32 value)
75 : {
76 0 : struct a4tech_sc *a4 = hid_get_drvdata(hdev);
77 : struct input_dev *input;
78 :
79 0 : if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
80 : return 0;
81 :
82 0 : input = field->hidinput->input;
83 :
84 0 : if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
85 0 : if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
86 0 : a4->delayed_value = value;
87 0 : return 1;
88 : }
89 :
90 0 : if (usage->hid == A4_WHEEL_ORIENTATION) {
91 0 : input_event(input, EV_REL, value ? REL_HWHEEL :
92 : REL_WHEEL, a4->delayed_value);
93 0 : input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES :
94 0 : REL_WHEEL_HI_RES, a4->delayed_value * 120);
95 0 : return 1;
96 : }
97 : }
98 :
99 0 : if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
100 0 : a4->hw_wheel = !!value;
101 0 : return 1;
102 : }
103 :
104 0 : if (usage->code == REL_WHEEL_HI_RES && a4->hw_wheel) {
105 0 : input_event(input, usage->type, REL_HWHEEL, value);
106 0 : input_event(input, usage->type, REL_HWHEEL_HI_RES, value * 120);
107 0 : return 1;
108 : }
109 :
110 : return 0;
111 : }
112 :
113 0 : 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 0 : a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
119 0 : if (a4 == NULL) {
120 0 : hid_err(hdev, "can't alloc device descriptor\n");
121 0 : return -ENOMEM;
122 : }
123 :
124 0 : a4->quirks = id->driver_data;
125 :
126 0 : hid_set_drvdata(hdev, a4);
127 :
128 0 : ret = hid_parse(hdev);
129 0 : if (ret) {
130 0 : hid_err(hdev, "parse failed\n");
131 0 : return ret;
132 : }
133 :
134 0 : ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
135 0 : if (ret) {
136 0 : hid_err(hdev, "hw start failed\n");
137 0 : 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 1 : module_hid_driver(a4_driver);
165 :
166 : MODULE_LICENSE("GPL");
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