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[linux-3.10.git] / drivers / hid / hid-cypress.c
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  */
33 static __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                         __u8 tmp;
45
46                         rdesc[i] = 0x19;
47                         rdesc[i + 2] = 0x29;
48                         tmp = rdesc[i + 3];
49                         rdesc[i + 3] = rdesc[i + 1];
50                         rdesc[i + 1] = tmp;
51                 }
52         return rdesc;
53 }
54
55 static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
56                 struct hid_field *field, struct hid_usage *usage,
57                 unsigned long **bit, int *max)
58 {
59         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
60
61         if (!(quirks & CP_2WHEEL_MOUSE_HACK))
62                 return 0;
63
64         if (usage->type == EV_REL && usage->code == REL_WHEEL)
65                 set_bit(REL_HWHEEL, *bit);
66         if (usage->hid == 0x00090005)
67                 return -1;
68
69         return 0;
70 }
71
72 static int cp_event(struct hid_device *hdev, struct hid_field *field,
73                 struct hid_usage *usage, __s32 value)
74 {
75         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
76
77         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
78                         !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
79                 return 0;
80
81         if (usage->hid == 0x00090005) {
82                 if (value)
83                         quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
84                 else
85                         quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
86                 hid_set_drvdata(hdev, (void *)quirks);
87                 return 1;
88         }
89
90         if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
91                 struct input_dev *input = field->hidinput->input;
92
93                 input_event(input, usage->type, REL_HWHEEL, value);
94                 return 1;
95         }
96
97         return 0;
98 }
99
100 static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
101 {
102         unsigned long quirks = id->driver_data;
103         int ret;
104
105         hid_set_drvdata(hdev, (void *)quirks);
106
107         ret = hid_parse(hdev);
108         if (ret) {
109                 hid_err(hdev, "parse failed\n");
110                 goto err_free;
111         }
112
113         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
114         if (ret) {
115                 hid_err(hdev, "hw start failed\n");
116                 goto err_free;
117         }
118
119         return 0;
120 err_free:
121         return ret;
122 }
123
124 static const struct hid_device_id cp_devices[] = {
125         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
126                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
127         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
128                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
129         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
130                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
131         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
132                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
133         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
134                 .driver_data = CP_2WHEEL_MOUSE_HACK },
135         { }
136 };
137 MODULE_DEVICE_TABLE(hid, cp_devices);
138
139 static struct hid_driver cp_driver = {
140         .name = "cypress",
141         .id_table = cp_devices,
142         .report_fixup = cp_report_fixup,
143         .input_mapped = cp_input_mapped,
144         .event = cp_event,
145         .probe = cp_probe,
146 };
147 module_hid_driver(cp_driver);
148
149 MODULE_LICENSE("GPL");