Staging: wlan-ng: fix compiler warnings
[linux-2.6] / drivers / hid / hid-a4tech.c
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) 2007 Paul Walmsley
9  *  Copyright (c) 2008 Jiri Slaby
10  */
11
12 /*
13  * This program is free software; you can redistribute it and/or modify it
14  * under the terms of the GNU General Public License as published by the Free
15  * Software Foundation; either version 2 of the License, or (at your option)
16  * any later version.
17  */
18
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
29 struct a4tech_sc {
30         unsigned long quirks;
31         unsigned int hw_wheel;
32         __s32 delayed_value;
33 };
34
35 static 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
50 static 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
88 static 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;
117 err_free:
118         kfree(a4);
119         return ret;
120 }
121
122 static 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
130 static 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 };
137 MODULE_DEVICE_TABLE(hid, a4_devices);
138
139 static 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
148 static int a4_init(void)
149 {
150         return hid_register_driver(&a4_driver);
151 }
152
153 static void a4_exit(void)
154 {
155         hid_unregister_driver(&a4_driver);
156 }
157
158 module_init(a4_init);
159 module_exit(a4_exit);
160 MODULE_LICENSE("GPL");
161
162 HID_COMPAT_LOAD_DRIVER(a4tech);