xref: /openbmc/linux/drivers/hid/hid-a4tech.c (revision 9ac8d3fb)
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);
163