// SPDX-License-Identifier: GPL-2.0+ /* * HID driver for gaming keys on Razer Blackwidow gaming keyboards * Macro Key Keycodes: M1 = 191, M2 = 192, M3 = 193, M4 = 194, M5 = 195 * * Copyright (c) 2021 Jelle van der Waa <jvanderwaa@redhat.com> */ #include <linux/device.h> #include <linux/hid.h> #include <linux/module.h> #include <linux/random.h> #include <linux/sched.h> #include <linux/usb.h> #include <linux/wait.h> #include "hid-ids.h" #define map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c)) #define RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE 91 static bool macro_key_remapping = 1; module_param(macro_key_remapping, bool, 0644); MODULE_PARM_DESC(macro_key_remapping, " on (Y) off (N)"); static unsigned char blackwidow_init[RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x04, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00 }; static int razer_input_mapping(struct hid_device *hdev, struct hid_input *hi, struct hid_field *field, struct hid_usage *usage, unsigned long **bit, int *max) { if (!macro_key_remapping) return 0; if ((usage->hid & HID_UP_KEYBOARD) != HID_UP_KEYBOARD) return 0; switch (usage->hid & ~HID_UP_KEYBOARD) { case 0x68: map_key_clear(KEY_MACRO1); return 1; case 0x69: map_key_clear(KEY_MACRO2); return 1; case 0x6a: map_key_clear(KEY_MACRO3); return 1; case 0x6b: map_key_clear(KEY_MACRO4); return 1; case 0x6c: map_key_clear(KEY_MACRO5); return 1; } return 0; } static int razer_probe(struct hid_device *hdev, const struct hid_device_id *id) { char *buf; int ret = 0; ret = hid_parse(hdev); if (ret) return ret; /* * Only send the enable macro keys command for the third device * identified as mouse input. */ if (hdev->type == HID_TYPE_USBMOUSE) { buf = kmemdup(blackwidow_init, RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE, GFP_KERNEL); if (buf == NULL) return -ENOMEM; ret = hid_hw_raw_request(hdev, 0, buf, RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE, HID_FEATURE_REPORT, HID_REQ_SET_REPORT); if (ret != RAZER_BLACKWIDOW_TRANSFER_BUF_SIZE) hid_err(hdev, "failed to enable macro keys: %d\n", ret); kfree(buf); } return hid_hw_start(hdev, HID_CONNECT_DEFAULT); } static const struct hid_device_id razer_devices[] = { { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, USB_DEVICE_ID_RAZER_BLACKWIDOW) }, { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, USB_DEVICE_ID_RAZER_BLACKWIDOW_CLASSIC) }, { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, USB_DEVICE_ID_RAZER_BLACKWIDOW_ULTIMATE) }, { } }; MODULE_DEVICE_TABLE(hid, razer_devices); static struct hid_driver razer_driver = { .name = "razer", .id_table = razer_devices, .input_mapping = razer_input_mapping, .probe = razer_probe, }; module_hid_driver(razer_driver); MODULE_AUTHOR("Jelle van der Waa <jvanderwaa@redhat.com>"); MODULE_LICENSE("GPL");