Merge tag 'sound-4.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[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  */
7
8 /*
9  * This program is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU General Public License as published by the Free
11  * Software Foundation; either version 2 of the License, or (at your option)
12  * any later version.
13  */
14
15 #include <linux/device.h>
16 #include <linux/hid.h>
17 #include <linux/module.h>
18
19 #include "hid-ids.h"
20
21 static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc,
22                 unsigned int *rsize)
23 {
24         switch (hdev->product) {
25         case USB_DEVICE_ID_ELECOM_BM084:
26                 /* The BM084 Bluetooth mouse includes a non-existing horizontal
27                  * wheel in the HID descriptor. */
28                 if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) {
29                         hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n");
30                         rdesc[47] = 0x00;
31                 }
32                 break;
33         case USB_DEVICE_ID_ELECOM_DEFT_WIRED:
34         case USB_DEVICE_ID_ELECOM_DEFT_WIRELESS:
35                 /* The DEFT trackball has eight buttons, but its descriptor only
36                  * reports five, disabling the three Fn buttons on the top of
37                  * the mouse.
38                  *
39                  * Apply the following diff to the descriptor:
40                  *
41                  * Collection (Physical),              Collection (Physical),
42                  *     Report ID (1),                      Report ID (1),
43                  *     Report Count (5),           ->      Report Count (8),
44                  *     Report Size (1),                    Report Size (1),
45                  *     Usage Page (Button),                Usage Page (Button),
46                  *     Usage Minimum (01h),                Usage Minimum (01h),
47                  *     Usage Maximum (05h),        ->      Usage Maximum (08h),
48                  *     Logical Minimum (0),                Logical Minimum (0),
49                  *     Logical Maximum (1),                Logical Maximum (1),
50                  *     Input (Variable),                   Input (Variable),
51                  *     Report Count (1),           ->      Report Count (0),
52                  *     Report Size (3),                    Report Size (3),
53                  *     Input (Constant),                   Input (Constant),
54                  *     Report Size (16),                   Report Size (16),
55                  *     Report Count (2),                   Report Count (2),
56                  *     Usage Page (Desktop),               Usage Page (Desktop),
57                  *     Usage (X),                          Usage (X),
58                  *     Usage (Y),                          Usage (Y),
59                  *     Logical Minimum (-32768),           Logical Minimum (-32768),
60                  *     Logical Maximum (32767),            Logical Maximum (32767),
61                  *     Input (Variable, Relative),         Input (Variable, Relative),
62                  * End Collection,                     End Collection,
63                  */
64                 if (*rsize == 213 && rdesc[13] == 5 && rdesc[21] == 5) {
65                         hid_info(hdev, "Fixing up Elecom DEFT Fn buttons\n");
66                         rdesc[13] = 8; /* Button/Variable Report Count */
67                         rdesc[21] = 8; /* Button/Variable Usage Maximum */
68                         rdesc[29] = 0; /* Button/Constant Report Count */
69                 }
70                 break;
71         }
72         return rdesc;
73 }
74
75 static const struct hid_device_id elecom_devices[] = {
76         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) },
77         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRED) },
78         { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRELESS) },
79         { }
80 };
81 MODULE_DEVICE_TABLE(hid, elecom_devices);
82
83 static struct hid_driver elecom_driver = {
84         .name = "elecom",
85         .id_table = elecom_devices,
86         .report_fixup = elecom_report_fixup
87 };
88 module_hid_driver(elecom_driver);
89
90 MODULE_LICENSE("GPL");