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