1/*
2 *  HID driver for some cypress "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/hid.h>
20#include <linux/input.h>
21#include <linux/module.h>
22
23#include "hid-ids.h"
24
25#define CP_RDESC_SWAPPED_MIN_MAX	0x01
26#define CP_2WHEEL_MOUSE_HACK		0x02
27#define CP_2WHEEL_MOUSE_HACK_ON		0x04
28
29/*
30 * Some USB barcode readers from cypress have usage min and usage max in
31 * the wrong order
32 */
33static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
34		unsigned int *rsize)
35{
36	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
37	unsigned int i;
38
39	if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX))
40		return rdesc;
41
42	for (i = 0; i < *rsize - 4; i++)
43		if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
44			rdesc[i] = 0x19;
45			rdesc[i + 2] = 0x29;
46			swap(rdesc[i + 3], rdesc[i + 1]);
47		}
48	return rdesc;
49}
50
51static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
52		struct hid_field *field, struct hid_usage *usage,
53		unsigned long **bit, int *max)
54{
55	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
56
57	if (!(quirks & CP_2WHEEL_MOUSE_HACK))
58		return 0;
59
60	if (usage->type == EV_REL && usage->code == REL_WHEEL)
61		set_bit(REL_HWHEEL, *bit);
62	if (usage->hid == 0x00090005)
63		return -1;
64
65	return 0;
66}
67
68static int cp_event(struct hid_device *hdev, struct hid_field *field,
69		struct hid_usage *usage, __s32 value)
70{
71	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
72
73	if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
74			!usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
75		return 0;
76
77	if (usage->hid == 0x00090005) {
78		if (value)
79			quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
80		else
81			quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
82		hid_set_drvdata(hdev, (void *)quirks);
83		return 1;
84	}
85
86	if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
87		struct input_dev *input = field->hidinput->input;
88
89		input_event(input, usage->type, REL_HWHEEL, value);
90		return 1;
91	}
92
93	return 0;
94}
95
96static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
97{
98	unsigned long quirks = id->driver_data;
99	int ret;
100
101	hid_set_drvdata(hdev, (void *)quirks);
102
103	ret = hid_parse(hdev);
104	if (ret) {
105		hid_err(hdev, "parse failed\n");
106		goto err_free;
107	}
108
109	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
110	if (ret) {
111		hid_err(hdev, "hw start failed\n");
112		goto err_free;
113	}
114
115	return 0;
116err_free:
117	return ret;
118}
119
120static const struct hid_device_id cp_devices[] = {
121	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
122		.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
123	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
124		.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
125	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
126		.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
127	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
128		.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
129	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
130		.driver_data = CP_2WHEEL_MOUSE_HACK },
131	{ }
132};
133MODULE_DEVICE_TABLE(hid, cp_devices);
134
135static struct hid_driver cp_driver = {
136	.name = "cypress",
137	.id_table = cp_devices,
138	.report_fixup = cp_report_fixup,
139	.input_mapped = cp_input_mapped,
140	.event = cp_event,
141	.probe = cp_probe,
142};
143module_hid_driver(cp_driver);
144
145MODULE_LICENSE("GPL");
146