Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[sfrench/cifs-2.6.git] / drivers / hid / hid-elecom.c
1 /*
2  *  HID driver for ELECOM devices.
3  *  Copyright (c) 2010 Richard Nauber <Richard.Nauber@gmail.com>
4  *  Copyright (c) 2016 Yuxuan Shui <yshuiv7@gmail.com>
5  *  Copyright (c) 2017 Diego Elio Pettenò <flameeyes@flameeyes.eu>
6  *  Copyright (c) 2017 Alex Manoussakis <amanou@gnu.org>
7  */
8
9 /*
10  * This program is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU General Public License as published by the Free
12  * Software Foundation; either version 2 of the License, or (at your option)
13  * any later version.
14  */
15
16 #include <linux/device.h>
17 #include <linux/hid.h>
18 #include <linux/module.h>
19
20 #include "hid-ids.h"
21
22 static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc,
23                 unsigned int *rsize)
24 {
25         switch (hdev->product) {
26         case USB_DEVICE_ID_ELECOM_BM084:
27                 /* The BM084 Bluetooth mouse includes a non-existing horizontal
28                  * wheel in the HID descriptor. */
29                 if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) {
30                         hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n");
31                         rdesc[47] = 0x00;
32                 }
33                 break;
34         case USB_DEVICE_ID_ELECOM_DEFT_WIRED:
35         case USB_DEVICE_ID_ELECOM_DEFT_WIRELESS:
36         case USB_DEVICE_ID_ELECOM_HUGE_WIRED:
37         case USB_DEVICE_ID_ELECOM_HUGE_WIRELESS:
38                 /* The DEFT/HUGE trackball has eight buttons, but its descriptor
39                  * only reports five, disabling the three Fn buttons on the top
40                  * of the mouse.
41                  *
42                  * Apply the following diff to the descriptor:
43                  *
44                  * Collection (Physical),              Collection (Physical),
45                  *     Report ID (1),                      Report ID (1),
46                  *     Report Count (5),           ->      Report Count (8),
47                  *     Report Size (1),                    Report Size (1),
48                  *     Usage Page (Button),                Usage Page (Button),
49                  *     Usage Minimum (01h),                Usage Minimum (01h),
50                  *     Usage Maximum (05h),        ->      Usage Maximum (08h),
51                  *     Logical Minimum (0),                Logical Minimum (0),
52                  *     Logical Maximum (1),                Logical Maximum (1),
53                  *     Input (Variable),                   Input (Variable),
54                  *     Report Count (1),           ->      Report Count (0),
55                  *     Report Size (3),                    Report Size (3),
56                  *     Input (Constant),                   Input (Constant),
57                  *     Report Size (16),                   Report Size (16),
58                  *     Report Count (2),                   Report Count (2),
59                  *     Usage Page (Desktop),               Usage Page (Desktop),
60                  *     Usage (X),                          Usage (X),
61                  *     Usage (Y),                          Usage (Y),
62                  *     Logical Minimum (-32768),           Logical Minimum (-32768),
63                  *     Logical Maximum (32767),            Logical Maximum (32767),
64                  *     Input (Variable, Relative),         Input (Variable, Relative),
65                  * End Collection,                     End Collection,
66                  */
67                 if (*rsize == 213 && rdesc[13] == 5 && rdesc[21] == 5) {
68                         hid_info(hdev, "Fixing up Elecom DEFT/HUGE Fn buttons\n");
69                         rdesc[13] = 8; /* Button/Variable Report Count */
70                         rdesc[21] = 8; /* Button/Variable Usage Maximum */
71                         rdesc[29] = 0; /* Button/Constant Report Count */
72                 }
73                 break;
74         }
75         return rdesc;
76 }
77
78 static const struct hid_device_id elecom_devices[] = {
79         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) },
80         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRED) },
81         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRELESS) },
82         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_HUGE_WIRED) },
83         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_HUGE_WIRELESS) },
84         { }
85 };
86 MODULE_DEVICE_TABLE(hid, elecom_devices);
87
88 static struct hid_driver elecom_driver = {
89         .name = "elecom",
90         .id_table = elecom_devices,
91         .report_fixup = elecom_report_fixup
92 };
93 module_hid_driver(elecom_driver);
94
95 MODULE_LICENSE("GPL");