The DEFT trackball has three non-standard buttons at the top which is
not supported by the hid-generic driver.
This patch add a driver that modifies the HID report, so those three
buttons can be supported like standard buttons.
---
drivers/hid/Kconfig | 6 ++++++
drivers/hid/Makefile | 1 +
drivers/hid/hid-deft.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/hid/hid-ids.h | 2 ++
4 files changed, 61 insertions(+)
create mode 100644 drivers/hid/hid-deft.c
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 5646ca4..9c3ee05 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -263,6 +263,12 @@ config HID_ELECOM
---help---
Support for the ELECOM BM084 (bluetooth mouse).
+config HID_ELECOM_DEFT
+ tristate "ELECOM DEFT trackball"
+ depends on HID
+ ---help---
+ Support for the Fn keys found on ELECOM DEFT trackball.
+
config HID_ELO
tristate "ELO USB 4000/4500 touchscreen"
depends on USB_HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index a2fb562..3cc582e 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_HID_CYPRESS) += hid-cypress.o
obj-$(CONFIG_HID_DRAGONRISE) += hid-dr.o
obj-$(CONFIG_HID_EMS_FF) += hid-emsff.o
obj-$(CONFIG_HID_ELECOM) += hid-elecom.o
+obj-$(CONFIG_HID_ELECOM_DEFT) += hid-deft.o
obj-$(CONFIG_HID_ELO) += hid-elo.o
obj-$(CONFIG_HID_EZKEY) += hid-ezkey.o
obj-$(CONFIG_HID_GEMBIRD) += hid-gembird.o
diff --git a/drivers/hid/hid-deft.c b/drivers/hid/hid-deft.c
new file mode 100644
index 0000000..4e2621d
--- /dev/null
+++ b/drivers/hid/hid-deft.c
@@ -0,0 +1,52 @@
+/*
+ * HID driver for Elecom DEFT (trackball).
+ * Extend the number of buttons to 8, and
+ * remove a non-standard item in the HID
+ * descriptor.
+ * (This module is based on "hid-elecom".)
+ *
+ * Copyright (c) 2016 Yuxuan Shui <yshuiv7@xxxxxxxxx>
+ */
+
+/*
+ * 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"
+
+static __u8 *deft_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+ unsigned int *rsize)
+{
+ if (*rsize >= 34 && rdesc[20] == 0x29 && rdesc[21] == 0x05) {
+ hid_info(hdev, "Fixing up Elecom DEFT report descriptor %x\n", rdesc[13]);
+ rdesc[21] = 0x08;
+ rdesc[13] = 0x08;
+
+ memmove(rdesc+28, rdesc+34, *rsize-34);
+ *rsize -= 6;
+ }
+ return rdesc;
+}
+
+static const struct hid_device_id deft_devices[] = {
+ { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT)},
+ { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFTW)},
+ { }
+};
+MODULE_DEVICE_TABLE(hid, deft_devices);
+
+static struct hid_driver deft_driver = {
+ .name = "elecom-deft",
+ .id_table = deft_devices,
+ .report_fixup = deft_report_fixup,
+};
+module_hid_driver(deft_driver);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 3eec09a1..534ae73 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -332,6 +332,8 @@
#define USB_VENDOR_ID_ELECOM 0x056e
#define USB_DEVICE_ID_ELECOM_BM084 0x0061
+#define USB_DEVICE_ID_ELECOM_DEFT 0x00fe
+#define USB_DEVICE_ID_ELECOM_DEFTW 0x00ff
#define USB_VENDOR_ID_DREAM_CHEEKY 0x1d34
--
2.9.0
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
