@@ -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
@@ -116,4 +117,3 @@ obj-$(CONFIG_USB_KBD) += usbhid/
obj-$(CONFIG_I2C_HID) += i2c-hid/
-obj-$(CONFIG_INTEL_ISH_HID) += intel-ish-hid/
@@ -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 +1,147 @@
+/*
+ * 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/log2.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. Some modifiers keys still don't work, e.g. Ctrl-Shift-P
+// Interestingly enough, this happens when pressing the physical left shift key, but now
+// when pressing the physical right shift key. hexdump does not show them either.
+// Test on Windows maybe?
+// 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 microdia_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ // do not map left shift since we will manually generate input
+ // events in microdia_raw_event
+ if ( (usage->hid & HID_USAGE_PAGE) == HID_UP_KEYBOARD ) {
+ if ( (usage->hid & HID_USAGE ) == 0xe1 ) {
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+// array index of a modifier matches the bit index in the data payload
+// the modifier data is always stored in the second int
+// e.g. for left alt the 1 bit is set - 04 04 ...
+static int microdia_modifiers[7] = {
+ KEY_LEFTCTRL,
+ KEY_RIGHTSHIFT, // TODO should be left shift, but not possible since it's ignored in the mapping
+ KEY_LEFTALT,
+ KEY_LEFTMETA,
+ KEY_RIGHTCTRL,
+ KEY_RIGHTSHIFT,
+ KEY_RIGHTALT
+};
+
+static int microdia_last_handled_modifier = 0;
+
+static int microdia_raw_event(struct hid_device *hdev, struct hid_report *report,
+ u8 *data, int size)
+{
+ int i, changed_key, new_value, mapped_key;
+ struct hid_input *hi;
+
+ // 1. validate that we get 8 bits of the for 04 xx 00 00 00 00 00 00
+ if ( size != 8 ) {
+ return 0;
+ }
+
+ if ( data[0] != 4) {
+ return 0;
+ }
+
+ // TODO - can I somehow use a bit mask? data & 0x00ffffff != 0
+ for ( i = 2; i < size; i++ ) {
+ if ( data[i] != 0 ) {
+ return 0;
+ }
+ }
+
+ // 2. detect based on previous data what key was pressed or depressed
+ // a key was pressed or depressed if its bit has a different value
+ // between this and the previous invocation. If the bit is set
+ // it was pressed
+
+ changed_key = data[1] ^ microdia_last_handled_modifier;
+ new_value = ( data[1] & changed_key )!= 0;
+ // TODO - is ilog2 really needed?
+ mapped_key = microdia_modifiers[ilog2(changed_key)];
+
+ printk("[hid-microdia] Got payload 0x%x\n", data[1]);
+ printk("[hid-microdia] Detected key %d value %d\n", changed_key, new_value);
+
+ // 3. report the key event and track what was sent
+ hi = hid_get_drvdata(hdev);
+
+ input_report_key(hi->input, mapped_key , new_value);
+
+ microdia_last_handled_modifier = data[1];
+
+ return 1;
+}
+
+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",
+ .input_mapping = microdia_input_mapping,
+ .id_table = microdia_devices,
+ .raw_event = microdia_raw_event,
+ .input_configured = microdia_input_configured,
+};
+
+module_hid_driver(microdia_driver);
+
+MODULE_LICENSE("GPL");