[v2] HID: Add support for Razer Blackwidow keyboards
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Message ID 20191013151650.41360-1-jelle@vdwaa.nl
State New
Delegated to: Jiri Kosina
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Series
  • [v2] HID: Add support for Razer Blackwidow keyboards
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Commit Message

Jelle van der Waa Oct. 13, 2019, 3:16 p.m. UTC
From: Jelle van der Waa <jelle@vdwaa.nl>

Add support for the macro keys on the Razer Blackwidow keyboards. By
default the macro keys do not work and have to be enabled via a feature
report. After being enabled they report as XF86Tools, XF86Launch5-8.

Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl>
---
 drivers/hid/Kconfig     |  7 ++++
 drivers/hid/Makefile    |  1 +
 drivers/hid/hid-ids.h   |  3 ++
 drivers/hid/hid-razer.c | 78 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 89 insertions(+)
 create mode 100644 drivers/hid/hid-razer.c

Patch
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diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 1ecb5124421c..4f347fe60a63 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -1144,6 +1144,13 @@  config HID_ALPS
 	Say Y here if you have a Alps touchpads over i2c-hid or usbhid
 	and want support for its special functionalities.
 
+config HID_RAZER
+	tristate "Razer Blackwidow keyboard support"
+	depends on HID
+	---help---
+	Say Y here if you want the Razer Blackwidow keyboards to enable macro
+	keys.
+
 endmenu
 
 endif # HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 0c03308cfb08..5ae72667b07e 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -107,6 +107,7 @@  obj-$(CONFIG_HID_STEAM)		+= hid-steam.o
 obj-$(CONFIG_HID_STEELSERIES)	+= hid-steelseries.o
 obj-$(CONFIG_HID_SUNPLUS)	+= hid-sunplus.o
 obj-$(CONFIG_HID_GREENASIA)	+= hid-gaff.o
+obj-$(CONFIG_HID_RAZER)		+= hid-razer.o
 obj-$(CONFIG_HID_THRUSTMASTER)	+= hid-tmff.o
 obj-$(CONFIG_HID_TIVO)		+= hid-tivo.o
 obj-$(CONFIG_HID_TOPSEED)	+= hid-topseed.o
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 76969a22b0f2..d9ab9a048fee 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -960,6 +960,9 @@ 
 
 #define USB_VENDOR_ID_RAZER            0x1532
 #define USB_DEVICE_ID_RAZER_BLADE_14   0x011D
+#define USB_DEVICE_ID_RAZER_BLACKWIDOW 0x010e
+#define USB_DEVICE_ID_RAZER_BLACKWIDOW_ULTIMATE 0x011a
+#define USB_DEVICE_ID_RAZER_BLACKWIDOW_2013 0x011b
 
 #define USB_VENDOR_ID_REALTEK		0x0bda
 #define USB_DEVICE_ID_REALTEK_READER	0x0152
diff --git a/drivers/hid/hid-razer.c b/drivers/hid/hid-razer.c
new file mode 100644
index 000000000000..d958fd9f9311
--- /dev/null
+++ b/drivers/hid/hid-razer.c
@@ -0,0 +1,78 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * HID driver to enable macro keys on Razer keyboards
+ *
+ * Copyright (c) 2019 Jelle van der Waa <jelle@vdwaa.nl>
+ */
+
+#include <linux/hid.h>
+#include <linux/module.h>
+#include "hid-ids.h"
+
+#define RAZER_BLACKWIDOW_FEATURE_REPORT 0x00
+#define BUF_SIZE 91
+
+static const u8 data[BUF_SIZE] = {0, 0, 0, 0, 0, 0, 2, 0, 4, 2, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 4, 0};
+
+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_2013) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_RAZER, USB_DEVICE_ID_RAZER_BLACKWIDOW_ULTIMATE) },
+	{}
+};
+
+MODULE_DEVICE_TABLE(hid, razer_devices);
+
+static int razer_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	struct hid_report_enum *rep_enum;
+	struct hid_report *rep;
+	unsigned char *dmabuf;
+	bool has_ff000002 = false;
+	int ret = 0;
+
+	dmabuf = kmemdup(data, BUF_SIZE, GFP_KERNEL);
+	if (!dmabuf)
+		return -ENOMEM;
+
+	hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
+
+	ret = hid_parse(hdev);
+	if (ret)
+		return ret;
+
+	rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
+	list_for_each_entry(rep, &rep_enum->report_list, list) {
+		if (rep->maxfield && rep->field[0]->maxusage)
+			if (rep->field[0]->usage[0].hid == 0xff000002)
+				has_ff000002 = true;
+	}
+
+	if (has_ff000002) {
+		ret = hid_hw_raw_request(hdev, RAZER_BLACKWIDOW_FEATURE_REPORT,
+				dmabuf, BUF_SIZE, HID_FEATURE_REPORT,
+				HID_REQ_SET_REPORT);
+		if (ret != BUF_SIZE)
+			hid_err(hdev, "Razer failed to enable macro keys\n");
+	}
+
+	kfree(dmabuf);
+
+	return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+}
+
+static struct hid_driver razer_driver = {
+	.name = "hid-razer",
+	.id_table = razer_devices,
+	.probe = razer_probe,
+};
+
+module_hid_driver(razer_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jelle van der Waa <jelle@vdwaa.nl");
+MODULE_DESCRIPTION("Razer blackwidow 2013/2014 HID driver");