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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2015-08-13 11:11:27 -0400
committerJiri Kosina <jkosina@suse.cz>2015-08-18 15:03:43 +0200
commit931830aa5c251e0803523213428f777a48bde254 (patch)
tree9a2ba7521c0d4153e51db6c141e03899c41f6f2f /drivers/hid/hid-gembird.c
parent7a834ba5e26e9e4afabf3cce9ca8cd1c6c3dce50 (diff)
HID: gembird: add new driver to fix Gembird JPD-DualForce 2
This gamepad advertise 5 absolute axis while 4 are actually used. The second Z axis shows some garbage, so it has to be ignored by HID. The first 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@gmx.fr> Tested-by: Orivej Desh <orivej@gmx.fr> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-gembird.c')
-rw-r--r--drivers/hid/hid-gembird.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/drivers/hid/hid-gembird.c b/drivers/hid/hid-gembird.c
new file mode 100644
index 000000000000..e55e519f311e
--- /dev/null
+++ b/drivers/hid/hid-gembird.c
@@ -0,0 +1,116 @@
+/*
+ * 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 8
+
+static const __u8 gembird_jpd_faulty_rdesc[] = {
+ 0x75, 0x08, /* Report Size (8) */
+ 0x95, 0x05, /* Report Count (5) */
+ 0x15, 0x00, /* Logical Minimum (0) */
+ 0x26, 0xff, 0x00, /* Logical Maximum (255) */
+ 0x35, 0x00, /* Physical Minimum (0) */
+ 0x46, 0xff, 0x00, /* Physical Maximum (255) */
+ 0x09, 0x30, /* Usage (X) */
+ 0x09, 0x31, /* Usage (Y) */
+ 0x09, 0x32, /* Usage (Z) */
+ 0x09, 0x32, /* Usage (Z) */
+ 0x09, 0x35, /* Usage (Rz) */
+ 0x81, 0x02, /* Input (Data,Var,Abs) */
+};
+
+/*
+ * we fix the report descriptor by:
+ * - marking the first Z axis as constant (so it is ignored by HID)
+ * - assign the original second Z to Rx
+ * - assign the original Rz to Ry
+ */
+static const __u8 gembird_jpd_fixed_rdesc[] = {
+ 0x75, 0x08, /* Report Size (8) */
+ 0x95, 0x02, /* Report Count (2) */
+ 0x15, 0x00, /* Logical Minimum (0) */
+ 0x26, 0xff, 0x00, /* Logical Maximum (255) */
+ 0x35, 0x00, /* Physical Minimum (0) */
+ 0x46, 0xff, 0x00, /* Physical Maximum (255) */
+ 0x09, 0x30, /* Usage (X) */
+ 0x09, 0x31, /* Usage (Y) */
+ 0x81, 0x02, /* Input (Data,Var,Abs) */
+ 0x95, 0x01, /* Report Count (1) */
+ 0x09, 0x32, /* Usage (Z) */
+ 0x81, 0x01, /* Input (Cnst,Arr,Abs) */
+ 0x95, 0x02, /* Report Count (2) */
+ 0x09, 0x33, /* Usage (Rx) */
+ 0x09, 0x34, /* Usage (Ry) */
+ 0x81, 0x02, /* Input (Data,Var,Abs) */
+};
+
+static __u8 *gembird_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+ unsigned int *rsize)
+{
+ __u8 *new_rdesc;
+ /* delta_size is > 0 */
+ size_t delta_size = sizeof(gembird_jpd_fixed_rdesc) -
+ sizeof(gembird_jpd_faulty_rdesc);
+ size_t new_size = *rsize + delta_size;
+
+ if (*rsize >= 31 && !memcmp(&rdesc[GEMBIRD_START_FAULTY_RDESC],
+ gembird_jpd_faulty_rdesc,
+ sizeof(gembird_jpd_faulty_rdesc))) {
+ new_rdesc = devm_kzalloc(&hdev->dev, new_size, GFP_KERNEL);
+ if (new_rdesc == NULL)
+ return rdesc;
+
+ dev_info(&hdev->dev,
+ "fixing Gembird JPD-DualForce 2 report descriptor.\n");
+
+ /* start by copying the end of the rdesc */
+ memcpy(new_rdesc + delta_size, rdesc, *rsize);
+
+ /* add the correct beginning */
+ memcpy(new_rdesc, rdesc, GEMBIRD_START_FAULTY_RDESC);
+
+ /* replace the faulty part with the fixed one */
+ memcpy(new_rdesc + GEMBIRD_START_FAULTY_RDESC,
+ gembird_jpd_fixed_rdesc,
+ sizeof(gembird_jpd_fixed_rdesc));
+
+ *rsize = new_size;
+ rdesc = new_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@gmail.com>");
+MODULE_DESCRIPTION("HID Gembird joypad driver");
+MODULE_LICENSE("GPL");