hid-a4tech.c revision 2f43f8749ebaeb4934f73a6f864fcbb60ce9f48a 
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
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		hid_err(hdev, "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		hid_err(hdev, "parse failed\n");
107		goto err_free;
108	}
109
110	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
111	if (ret) {
112		hid_err(hdev, "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	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
136		.driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
137	{ }
138};
139MODULE_DEVICE_TABLE(hid, a4_devices);
140
141static struct hid_driver a4_driver = {
142	.name = "a4tech",
143	.id_table = a4_devices,
144	.input_mapped = a4_input_mapped,
145	.event = a4_event,
146	.probe = a4_probe,
147	.remove = a4_remove,
148};
149
150static int __init a4_init(void)
151{
152	return hid_register_driver(&a4_driver);
153}
154
155static void __exit a4_exit(void)
156{
157	hid_unregister_driver(&a4_driver);
158}
159
160module_init(a4_init);
161module_exit(a4_exit);
162MODULE_LICENSE("GPL");
163