@@ -521,6 +521,13 @@ config HID_MAYFLASH
Say Y here if you have HJZ Mayflash PS3 game controller adapters
and want to enable force feedback support.
+config HID_MICRODIA
+ tristate "Microdia based keyboards"
+ depends on HID
+ default !EXPERT
+ ---help---
+ Support for Microdia based keyboards such as the Redragon Asura.
+
config HID_MICROSOFT
tristate "Microsoft non-fully HID-compliant devices"
depends on HID
@@ -59,6 +59,7 @@ obj-$(CONFIG_HID_LOGITECH_DJ) += hid-logitech-dj.o
obj-$(CONFIG_HID_LOGITECH_HIDPP) += hid-logitech-hidpp.o
obj-$(CONFIG_HID_MAGICMOUSE) += hid-magicmouse.o
obj-$(CONFIG_HID_MAYFLASH) += hid-mf.o
+obj-$(CONFIG_HID_MICRODIA) += hid-microdia.o
obj-$(CONFIG_HID_MICROSOFT) += hid-microsoft.o
obj-$(CONFIG_HID_MONTEREY) += hid-monterey.o
obj-$(CONFIG_HID_MULTITOUCH) += hid-multitouch.o
@@ -1974,6 +1974,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICOLCD) },
{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICOLCD_BOOTLOADER) },
{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_LUXAFOR) },
+ { HID_USB_DEVICE(USB_VENDOR_ID_MICRODIA, USB_DEVICE_ID_REDRAGON_ASURA) },
{ HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_COMFORT_MOUSE_4500) },
{ HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_COMFORT_KEYBOARD) },
{ HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_SIDEWINDER_GV) },
@@ -1127,4 +1127,7 @@
#define USB_VENDOR_ID_UGTIZER 0x2179
#define USB_DEVICE_ID_UGTIZER_TABLET_GP0610 0x0053
+#define USB_VENDOR_ID_MICRODIA 0x0c45
+#define USB_DEVICE_ID_REDRAGON_ASURA 0x760b
+
#endif
new file mode 100644
@@ -0,0 +1,121 @@
+/*
+ * HID driver for Microdia-based keyboards
+ *
+ * Copyright (c) 2017 Robert Munteanu
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/input-event-codes.h>
+
+#include "hid-ids.h"
+
+
+// The microdia family of keyboards uses a non-standard way of sending modifier keys
+//
+// The down event always sets the first bit to 0x04 and the second keycode to a custom value
+// For instance, left shift sends the following bits
+//
+// 04 02 00 00 00 00 00 00
+//
+// while left control sends
+//
+// 04 01 00 00 00 00 00 00
+//
+// Unfortunately these are all mapped to left shift and the keyboard is non-functional in that respect
+// To solve the problem, we capture the raw data in raw_event and manually genereate the correct input
+// events
+//
+// TODO
+// 1. When overriding pressed keys the left shift key code is also sent
+// 2. A second USB keyboard is registered, but it should be removed
+
+static int microdia_input_configured(struct hid_device *hdev, struct hid_input *hi)
+{
+ hid_set_drvdata(hdev, hi);
+
+ return 0;
+}
+
+static int last_key;
+
+static int microdia_raw_event(struct hid_device *hdev, struct hid_report *report,
+ u8 *data, int size)
+{
+ int ret = 0, key, value;
+ struct hid_input *hi = hid_get_drvdata(hdev);
+
+ if ( size >= 2 && data[0] == 4 && data[1] != 2) {
+ value = data[1] != 0;
+ printk("[hid-microdia] raw (sz=%d) %d %d: ", size, data[0], data[1]);
+ if ( !value ) {
+ key = last_key;
+ last_key = 0;
+ ret = 1;
+ } else {
+ switch(data[1]) {
+ case 1: // left control
+ key = KEY_LEFTCTRL;
+ ret = 1;
+ break;
+ // case 2: // left shift
+ case 4: // left alt
+ key = KEY_LEFTALT;
+ ret = 1;
+ break;
+ case 8: // left win key
+ key = KEY_LEFTMETA;
+ ret = 1;
+ break;
+ case 16: // right ctrl
+ key = KEY_RIGHTCTRL;
+ ret = 1;
+ break;
+ case 32: // right shift
+ key = KEY_RIGHTSHIFT;
+ ret = 1;
+ break;
+ case 64: // right alt
+ key = KEY_RIGHTALT;
+ ret = 1;
+ break;
+ }
+ }
+
+ if ( ret ) {
+ input_report_key(hi->input, key, value);
+ last_key = key;
+ printk("Remapped %d %d to key %d value %d\n", data[0], data[1], key, value);
+ }
+ }
+ printk("Returning %d\n", ret);
+ return ret;
+}
+
+static const struct hid_device_id microdia_devices[] = {
+ {HID_USB_DEVICE(USB_VENDOR_ID_MICRODIA, USB_DEVICE_ID_REDRAGON_ASURA)},
+ {}
+};
+
+MODULE_DEVICE_TABLE(hid, microdia_devices);
+
+static struct hid_driver microdia_driver = {
+ .name = "microdia",
+ .id_table = microdia_devices,
+ .raw_event = microdia_raw_event,
+ .input_configured = microdia_input_configured,
+};
+
+module_hid_driver(microdia_driver);
+
+MODULE_LICENSE("GPL");