drivers/hid/hid-semitek.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  HID driver for Semitek keyboards
0004  *
0005  *  Copyright (c) 2021 Benjamin Moody
0006  */
0007
0008 #include <linux/device.h>
0009 #include <linux/hid.h>
0010 #include <linux/module.h>
0011
0012 #include "hid-ids.h"
0013
0014 static __u8 *semitek_report_fixup(struct hid_device *hdev, __u8 *rdesc,
0015                                   unsigned int *rsize)
0016 {
0017     /* In the report descriptor for interface 2, fix the incorrect
0018        description of report ID 0x04 (the report contains a
0019        bitmask, not an array of keycodes.) */
0020     if (*rsize == 0xcb && rdesc[0x83] == 0x81 && rdesc[0x84] == 0x00) {
0021         hid_info(hdev, "fixing up Semitek report descriptor\n");
0022         rdesc[0x84] = 0x02;
0023     }
0024     return rdesc;
0025 }
0026
0027 static const struct hid_device_id semitek_devices[] = {
0028     { HID_USB_DEVICE(USB_VENDOR_ID_SEMITEK, USB_DEVICE_ID_SEMITEK_KEYBOARD) },
0029     { }
0030 };
0031 MODULE_DEVICE_TABLE(hid, semitek_devices);
0032
0033 static struct hid_driver semitek_driver = {
0034     .name = "semitek",
0035     .id_table = semitek_devices,
0036     .report_fixup = semitek_report_fixup,
0037 };
0038 module_hid_driver(semitek_driver);
0039
0040 MODULE_LICENSE("GPL");