Re: [PATCH] HID: gembird: add new driver to fix Gembird JPD-DualForce 2

From: Orivej Desh
Date: Tue Aug 11 2015 - 21:33:16 EST

This gamepad advertises 5 absolute axis while 4 are actually used.
The first Z axis shows some garbage, so it has to be ignored by HID.
The second Z axis and the Rz one are actually Rx and Ry. Remap them.

We could also just remap and ignore the axis in .input_mapping(). I
went ahead with .report_fixup() first, so here it is.

Reported-by: Orivej Desh <orivej@xxxxxx>
Tested-by: Orivej Desh <orivej@xxxxxx>
---

* Benjamin Tissoires
> so here are the fixes I mentioned yesterday. If you could give a quick shot
> and a "tested-by" that would be even better.

I tested your patch and it works as advertised, thank you! But your
comment about the implementation (Âre-assigning X to the original Z
axisÂ) did not match the implementation, so I simplified the
implementation according to the comment, and tested it too. Since the
patch has changed, I think you need to sign it off again.

> Jiri, I am not sure if the .input_mapping() alternative would not be better.
> Both solutions are valid, so if you do not like my memcpys, I can re-write the
> patch the other way.

drivers/hid/Kconfig | 6 ++++
drivers/hid/Makefile | 1 +
drivers/hid/hid-core.c | 1 +
drivers/hid/hid-gembird.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/hid/hid-ids.h | 3 ++
5 files changed, 88 insertions(+)
create mode 100644 drivers/hid/hid-gembird.c

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 57c94d7..6ab51ae 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -251,6 +251,12 @@ config HID_EZKEY
---help---
Support for Ezkey BTC 8193 keyboard.

+config HID_GEMBIRD
+ tristate "Gembird Joypad"
+ depends on HID
+ ---help---
+ Support for Gembird JPD-DualForce 2.
+
config HID_HOLTEK
tristate "Holtek HID devices"
depends on USB_HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 2f8a41d..e6441bc 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_HID_EMS_FF) += hid-emsff.o
obj-$(CONFIG_HID_ELECOM) += hid-elecom.o
obj-$(CONFIG_HID_ELO) += hid-elo.o
obj-$(CONFIG_HID_EZKEY) += hid-ezkey.o
+obj-$(CONFIG_HID_GEMBIRD) += hid-gembird.o
obj-$(CONFIG_HID_GT683R) += hid-gt683r.o
obj-$(CONFIG_HID_GYRATION) += hid-gyration.o
obj-$(CONFIG_HID_HOLTEK) += hid-holtek-kbd.o
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index e982e70..22afab9 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1844,6 +1844,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
{ HID_USB_DEVICE(USB_VENDOR_ID_GAMERON, USB_DEVICE_ID_GAMERON_DUAL_PSX_ADAPTOR) },
{ HID_USB_DEVICE(USB_VENDOR_ID_GAMERON, USB_DEVICE_ID_GAMERON_DUAL_PCS_ADAPTOR) },
+ { HID_USB_DEVICE(USB_VENDOR_ID_GEMBIRD, USB_DEVICE_ID_GEMBIRD_JPD_DUALFORCE2) },
{ HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0003) },
{ HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012) },
{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE) },
diff --git a/drivers/hid/hid-gembird.c b/drivers/hid/hid-gembird.c
new file mode 100644
index 0000000..cefc394
--- /dev/null
+++ b/drivers/hid/hid-gembird.c
@@ -0,0 +1,77 @@
+/*
+ * HID driver for Gembird Joypad, "PC Game Controller"
+ *
+ * Copyright (c) 2015 Red Hat, Inc
+ * Copyright (c) 2015 Benjamin Tissoires
+ */
+
+/*
+ * 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/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+#define GEMBIRD_START_FAULTY_RDESC 22
+
+/*
+ * This gamepad advertises 5 absolute axis while 4 are actually used.
+ * The first Z axis shows some garbage, so it has to be ignored by HID.
+ * The second Z axis and the Rz one are actually Rx and Ry. Remap them.
+ */
+
+static const __u8 gembird_jpd_faulty_rdesc[] = {
+ 0x09, 0x30, /* Usage (X) */
+ 0x09, 0x31, /* Usage (Y) */
+ 0x09, 0x32, /* Usage (Z) */
+ 0x09, 0x32, /* Usage (Z) */
+ 0x09, 0x35, /* Usage (Rz) */
+};
+static const __u8 gembird_jpd_fixed_rdesc[] = {
+ 0x09, 0x30, /* Usage (X) */
+ 0x09, 0x31, /* Usage (Y) */
+ 0x09, 0x30, /* Usage (X) (ignored) */
+ 0x09, 0x33, /* Usage (Rx) */
+ 0x09, 0x34, /* Usage (Ry) */
+};
+
+static __u8 *gembird_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+ unsigned int *rsize)
+{
+ if (*rsize >= 32 && !memcmp(&rdesc[GEMBIRD_START_FAULTY_RDESC],
+ gembird_jpd_faulty_rdesc,
+ sizeof(gembird_jpd_faulty_rdesc))) {
+ dev_info(&hdev->dev,
+ "fixing Gembird JPD-DualForce 2 report descriptor.\n");
+
+ memcpy(rdesc + GEMBIRD_START_FAULTY_RDESC,
+ gembird_jpd_fixed_rdesc,
+ sizeof(gembird_jpd_fixed_rdesc));
+ }
+
+ return rdesc;
+}
+
+static const struct hid_device_id gembird_devices[] = {
+ { HID_USB_DEVICE(USB_VENDOR_ID_GEMBIRD,
+ USB_DEVICE_ID_GEMBIRD_JPD_DUALFORCE2) },
+ { }
+};
+MODULE_DEVICE_TABLE(hid, gembird_devices);
+
+static struct hid_driver gembird_driver = {
+ .name = "gembird",
+ .id_table = gembird_devices,
+ .report_fixup = gembird_report_fixup,
+};
+module_hid_driver(gembird_driver);
+
+MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@xxxxxxxxx>");
+MODULE_DESCRIPTION("HID Gembird joypad driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 602f2b7..720d5e3 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -363,6 +363,9 @@
#define USB_DEVICE_ID_GAMERON_DUAL_PSX_ADAPTOR 0x0001
#define USB_DEVICE_ID_GAMERON_DUAL_PCS_ADAPTOR 0x0002

+#define USB_VENDOR_ID_GEMBIRD 0x11ff
+#define USB_DEVICE_ID_GEMBIRD_JPD_DUALFORCE2 0x3331
+
#define USB_VENDOR_ID_GENERAL_TOUCH 0x0dfc
#define USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS 0x0003
#define USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PWT_TENFINGERS 0x0100
--
2.4.3

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