1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * HID driver for some cypress "special" devices
4 *
5 * Copyright (c) 1999 Andreas Gal
6 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
7 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
8 * Copyright (c) 2006-2007 Jiri Kosina
9 * Copyright (c) 2008 Jiri Slaby
10 */
11
12 /*
13 */
14
15 #include <linux/device.h>
16 #include <linux/hid.h>
17 #include <linux/input.h>
18 #include <linux/module.h>
19
20 #include "hid-ids.h"
21
22 #define CP_RDESC_SWAPPED_MIN_MAX 0x01
23 #define CP_2WHEEL_MOUSE_HACK 0x02
24 #define CP_2WHEEL_MOUSE_HACK_ON 0x04
25
26 /*
27 * Some USB barcode readers from cypress have usage min and usage max in
28 * the wrong order
29 */
cp_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)30 static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
31 unsigned int *rsize)
32 {
33 unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
34 unsigned int i;
35
36 if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX))
37 return rdesc;
38
39 if (*rsize < 4)
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
cp_input_mapped(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)51 static 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
cp_event(struct hid_device * hdev,struct hid_field * field,struct hid_usage * usage,__s32 value)68 static 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
cp_probe(struct hid_device * hdev,const struct hid_device_id * id)96 static 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;
116 err_free:
117 return ret;
118 }
119
120 static 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 };
133 MODULE_DEVICE_TABLE(hid, cp_devices);
134
135 static 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 };
143 module_hid_driver(cp_driver);
144
145 MODULE_LICENSE("GPL");
146