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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#include <linux/slab.h>
24
25#include "hid-ids.h"
26
27#define A4_2WHEEL_MOUSE_HACK_7 0x01
28#define A4_2WHEEL_MOUSE_HACK_B8 0x02
29
30struct a4tech_sc {
31 unsigned long quirks;
32 unsigned int hw_wheel;
33 __s32 delayed_value;
34};
35
36static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
37 struct hid_field *field, struct hid_usage *usage,
38 unsigned long **bit, int *max)
39{
40 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
41
42 if (usage->type == EV_REL && usage->code == REL_WHEEL)
43 set_bit(REL_HWHEEL, *bit);
44
45 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
46 return -1;
47
48 return 0;
49}
50
51static int a4_event(struct hid_device *hdev, struct hid_field *field,
52 struct hid_usage *usage, __s32 value)
53{
54 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
55 struct input_dev *input;
56
57 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
58 !usage->type)
59 return 0;
60
61 input = field->hidinput->input;
62
63 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
64 if (usage->type == EV_REL && usage->code == REL_WHEEL) {
65 a4->delayed_value = value;
66 return 1;
67 }
68
69 if (usage->hid == 0x000100b8) {
70 input_event(input, EV_REL, value ? REL_HWHEEL :
71 REL_WHEEL, a4->delayed_value);
72 return 1;
73 }
74 }
75
76 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
77 a4->hw_wheel = !!value;
78 return 1;
79 }
80
81 if (usage->code == REL_WHEEL && a4->hw_wheel) {
82 input_event(input, usage->type, REL_HWHEEL, value);
83 return 1;
84 }
85
86 return 0;
87}
88
89static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
90{
91 struct a4tech_sc *a4;
92 int ret;
93
94 a4 = kzalloc(sizeof(*a4), GFP_KERNEL);
95 if (a4 == NULL) {
96 hid_err(hdev, "can't alloc device descriptor\n");
97 ret = -ENOMEM;
98 goto err_free;
99 }
100
101 a4->quirks = id->driver_data;
102
103 hid_set_drvdata(hdev, a4);
104
105 ret = hid_parse(hdev);
106 if (ret) {
107 hid_err(hdev, "parse failed\n");
108 goto err_free;
109 }
110
111 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
112 if (ret) {
113 hid_err(hdev, "hw start failed\n");
114 goto err_free;
115 }
116
117 return 0;
118err_free:
119 kfree(a4);
120 return ret;
121}
122
123static void a4_remove(struct hid_device *hdev)
124{
125 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
126
127 hid_hw_stop(hdev);
128 kfree(a4);
129}
130
131static const struct hid_device_id a4_devices[] = {
132 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
133 .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
134 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
135 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
136 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
137 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
138 { }
139};
140MODULE_DEVICE_TABLE(hid, a4_devices);
141
142static struct hid_driver a4_driver = {
143 .name = "a4tech",
144 .id_table = a4_devices,
145 .input_mapped = a4_input_mapped,
146 .event = a4_event,
147 .probe = a4_probe,
148 .remove = a4_remove,
149};
150
151static int __init a4_init(void)
152{
153 return hid_register_driver(&a4_driver);
154}
155
156static void __exit a4_exit(void)
157{
158 hid_unregister_driver(&a4_driver);
159}
160
161module_init(a4_init);
162module_exit(a4_exit);
163MODULE_LICENSE("GPL");
164
