1 /*
2 * HID driver for some a4tech "special" devices
3 *
4 * Copyright (c) 1999 Andreas Gal
5 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
6 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
7 * Copyright (c) 2006-2007 Jiri Kosina
8 * Copyright (c) 2008 Jiri Slaby
9 */
10
11 /*
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
15 * any later version.
16 */
17
18 #include <linux/device.h>
19 #include <linux/input.h>
20 #include <linux/hid.h>
21 #include <linux/module.h>
22 #include <linux/slab.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
29 #define A4_WHEEL_ORIENTATION (HID_UP_GENDESK | 0x000000b8)
30
31 struct a4tech_sc {
32 unsigned long quirks;
33 unsigned int hw_wheel;
34 __s32 delayed_value;
35 };
36
a4_input_mapping(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)37 static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi,
38 struct hid_field *field, struct hid_usage *usage,
39 unsigned long **bit, int *max)
40 {
41 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
42
43 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
44 usage->hid == A4_WHEEL_ORIENTATION) {
45 /*
46 * We do not want to have this usage mapped to anything as it's
47 * nonstandard and doesn't really behave like an HID report.
48 * It's only selecting the orientation (vertical/horizontal) of
49 * the previous mouse wheel report. The input_events will be
50 * generated once both reports are recorded in a4_event().
51 */
52 return -1;
53 }
54
55 return 0;
56
57 }
58
a4_input_mapped(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)59 static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
60 struct hid_field *field, struct hid_usage *usage,
61 unsigned long **bit, int *max)
62 {
63 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
64
65 if (usage->type == EV_REL && usage->code == REL_WHEEL)
66 set_bit(REL_HWHEEL, *bit);
67
68 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
69 return -1;
70
71 return 0;
72 }
73
a4_event(struct hid_device * hdev,struct hid_field * field,struct hid_usage * usage,__s32 value)74 static int a4_event(struct hid_device *hdev, struct hid_field *field,
75 struct hid_usage *usage, __s32 value)
76 {
77 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
78 struct input_dev *input;
79
80 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
81 return 0;
82
83 input = field->hidinput->input;
84
85 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
86 if (usage->type == EV_REL && usage->code == REL_WHEEL) {
87 a4->delayed_value = value;
88 return 1;
89 }
90
91 if (usage->hid == A4_WHEEL_ORIENTATION) {
92 input_event(input, EV_REL, value ? REL_HWHEEL :
93 REL_WHEEL, a4->delayed_value);
94 return 1;
95 }
96 }
97
98 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
99 a4->hw_wheel = !!value;
100 return 1;
101 }
102
103 if (usage->code == REL_WHEEL && a4->hw_wheel) {
104 input_event(input, usage->type, REL_HWHEEL, value);
105 return 1;
106 }
107
108 return 0;
109 }
110
a4_probe(struct hid_device * hdev,const struct hid_device_id * id)111 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
112 {
113 struct a4tech_sc *a4;
114 int ret;
115
116 a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
117 if (a4 == NULL) {
118 hid_err(hdev, "can't alloc device descriptor\n");
119 return -ENOMEM;
120 }
121
122 a4->quirks = id->driver_data;
123
124 hid_set_drvdata(hdev, a4);
125
126 ret = hid_parse(hdev);
127 if (ret) {
128 hid_err(hdev, "parse failed\n");
129 return ret;
130 }
131
132 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
133 if (ret) {
134 hid_err(hdev, "hw start failed\n");
135 return ret;
136 }
137
138 return 0;
139 }
140
141 static const struct hid_device_id a4_devices[] = {
142 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
143 .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
144 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
145 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
146 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
147 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
148 { }
149 };
150 MODULE_DEVICE_TABLE(hid, a4_devices);
151
152 static struct hid_driver a4_driver = {
153 .name = "a4tech",
154 .id_table = a4_devices,
155 .input_mapping = a4_input_mapping,
156 .input_mapped = a4_input_mapped,
157 .event = a4_event,
158 .probe = a4_probe,
159 };
160 module_hid_driver(a4_driver);
161
162 MODULE_LICENSE("GPL");
163