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19#include <linux/device.h>
20#include <linux/input.h>
21#include <linux/hid.h>
22#include <linux/module.h>
23
24#include "hid-ids.h"
25
26#define A4_2WHEEL_MOUSE_HACK_7 0x01
27#define A4_2WHEEL_MOUSE_HACK_B8 0x02
28
29struct a4tech_sc {
30 unsigned long quirks;
31 unsigned int hw_wheel;
32 __s32 delayed_value;
33};
34
35static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
36 struct hid_field *field, struct hid_usage *usage,
37 unsigned long **bit, int *max)
38{
39 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
40
41 if (usage->type == EV_REL && usage->code == REL_WHEEL)
42 set_bit(REL_HWHEEL, *bit);
43
44 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
45 return -1;
46
47 return 0;
48}
49
50static int a4_event(struct hid_device *hdev, struct hid_field *field,
51 struct hid_usage *usage, __s32 value)
52{
53 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
54 struct input_dev *input;
55
56 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
57 !usage->type)
58 return 0;
59
60 input = field->hidinput->input;
61
62 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
63 if (usage->type == EV_REL && usage->code == REL_WHEEL) {
64 a4->delayed_value = value;
65 return 1;
66 }
67
68 if (usage->hid == 0x000100b8) {
69 input_event(input, EV_REL, value ? REL_HWHEEL :
70 REL_WHEEL, a4->delayed_value);
71 return 1;
72 }
73 }
74
75 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
76 a4->hw_wheel = !!value;
77 return 1;
78 }
79
80 if (usage->code == REL_WHEEL && a4->hw_wheel) {
81 input_event(input, usage->type, REL_HWHEEL, value);
82 return 1;
83 }
84
85 return 0;
86}
87
88static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
89{
90 struct a4tech_sc *a4;
91 int ret;
92
93 a4 = kzalloc(sizeof(*a4), GFP_KERNEL);
94 if (a4 == NULL) {
95 dev_err(&hdev->dev, "can't alloc device descriptor\n");
96 ret = -ENOMEM;
97 goto err_free;
98 }
99
100 a4->quirks = id->driver_data;
101
102 hid_set_drvdata(hdev, a4);
103
104 ret = hid_parse(hdev);
105 if (ret) {
106 dev_err(&hdev->dev, "parse failed\n");
107 goto err_free;
108 }
109
110 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
111 if (ret) {
112 dev_err(&hdev->dev, "hw start failed\n");
113 goto err_free;
114 }
115
116 return 0;
117err_free:
118 kfree(a4);
119 return ret;
120}
121
122static void a4_remove(struct hid_device *hdev)
123{
124 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
125
126 hid_hw_stop(hdev);
127 kfree(a4);
128}
129
130static const struct hid_device_id a4_devices[] = {
131 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
132 .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
133 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
134 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
135 { }
136};
137MODULE_DEVICE_TABLE(hid, a4_devices);
138
139static struct hid_driver a4_driver = {
140 .name = "a4tech",
141 .id_table = a4_devices,
142 .input_mapped = a4_input_mapped,
143 .event = a4_event,
144 .probe = a4_probe,
145 .remove = a4_remove,
146};
147
148static int __init a4_init(void)
149{
150 return hid_register_driver(&a4_driver);
151}
152
153static void __exit a4_exit(void)
154{
155 hid_unregister_driver(&a4_driver);
156}
157
158module_init(a4_init);
159module_exit(a4_exit);
160MODULE_LICENSE("GPL");
161
