HID: add support for Keytouch IEC 60945

The keyboard has several bugs in its report descriptor, most
importantly the Logical Min/Max are completely off.

Replace it with simplified descriptor which describes it properly.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/Kconfig

@@ -180,6 +180,14 @@ config HID_EZKEY
 	---help---
 	Support for Ezkey BTC 8193 keyboard.
 
+config HID_KEYTOUCH
+	tristate "Keyoutch HID devices"
+	depends on USB_HID
+	---help---
+	Support for Keytouch HID devices not fully compliant with
+	the specification. Currently supported:
+		- Keytouch IEC 60945
+
 config HID_KYE
 	tristate "Kye/Genius Ergo Mouse" if EMBEDDED
 	depends on USB_HID

drivers/hid/Makefile

@@ -41,6 +41,7 @@ obj-$(CONFIG_HID_ELECOM)	+= hid-elecom.o
 obj-$(CONFIG_HID_EZKEY)		+= hid-ezkey.o
 obj-$(CONFIG_HID_GYRATION)	+= hid-gyration.o
 obj-$(CONFIG_HID_KENSINGTON)	+= hid-kensington.o
+obj-$(CONFIG_HID_KEYTOUCH)	+= hid-keytouch.o
 obj-$(CONFIG_HID_KYE)		+= hid-kye.o
 obj-$(CONFIG_HID_LCPOWER)       += hid-lcpower.o
 obj-$(CONFIG_HID_LOGITECH)	+= hid-logitech.o

drivers/hid/hid-core.c

@@ -1379,6 +1379,7 @@ static const struct hid_device_id hid_have_special_driver[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_3) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_HANVON, USB_DEVICE_ID_HANVON_MULTITOUCH) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_KENSINGTON, USB_DEVICE_ID_KS_SLIMBLADE) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_KEYTOUCH, USB_DEVICE_ID_KEYTOUCH_IEC) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_ERGO_525V) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LABTEC, USB_DEVICE_ID_LABTEC_WIRELESS_KEYBOARD) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LCPOWER, USB_DEVICE_ID_LCPOWER_LC1000 ) },

drivers/hid/hid-ids.h

@@ -345,6 +345,9 @@
 #define USB_VENDOR_ID_KWORLD		0x1b80
 #define USB_DEVICE_ID_KWORLD_RADIO_FM700	0xd700
 
+#define USB_VENDOR_ID_KEYTOUCH		0x0926
+#define USB_DEVICE_ID_KEYTOUCH_IEC	0x3333
+
 #define USB_VENDOR_ID_KYE		0x0458
 #define USB_DEVICE_ID_KYE_ERGO_525V	0x0087
 #define USB_DEVICE_ID_KYE_GPEN_560	0x5003

drivers/hid/hid-keytouch.c

+/*
+ *  HID driver for Keytouch devices not fully compliant with HID standard
+ *
+ *  Copyright (c) 2011 Jiri Kosina
+ */
+
+/*
+ * 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"
+
+/* Replace the broken report descriptor of this device with rather
+ * a default one */
+static __u8 keytouch_fixed_rdesc[] = {
+0x05, 0x01, 0x09, 0x06, 0xa1, 0x01, 0x05, 0x07, 0x19, 0xe0, 0x29, 0xe7, 0x15,
+0x00, 0x25, 0x01, 0x75, 0x01, 0x95, 0x08, 0x81, 0x02, 0x95, 0x01, 0x75, 0x08,
+0x81, 0x01, 0x95, 0x03, 0x75, 0x01, 0x05, 0x08, 0x19, 0x01, 0x29, 0x03, 0x91,
+0x02, 0x95, 0x05, 0x75, 0x01, 0x91, 0x01, 0x95, 0x06, 0x75, 0x08, 0x15, 0x00,
+0x26, 0xff, 0x00, 0x05, 0x07, 0x19, 0x00, 0x2a, 0xff, 0x00, 0x81, 0x00, 0xc0
+};
+
+static __u8 *keytouch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+		unsigned int *rsize)
+{
+	hid_info(hdev, "fixing up Keytouch IEC report descriptor\n");
+
+	rdesc = keytouch_fixed_rdesc;
+	*rsize = sizeof(keytouch_fixed_rdesc);
+
+	return rdesc;
+}
+
+static const struct hid_device_id keytouch_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_KEYTOUCH, USB_DEVICE_ID_KEYTOUCH_IEC) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, keytouch_devices);
+
+static struct hid_driver keytouch_driver = {
+	.name = "keytouch",
+	.id_table = keytouch_devices,
+	.report_fixup = keytouch_report_fixup,
+};
+
+static int __init keytouch_init(void)
+{
+	return hid_register_driver(&keytouch_driver);
+}
+
+static void __exit keytouch_exit(void)
+{
+	hid_unregister_driver(&keytouch_driver);
+}
+
+module_init(keytouch_init);
+module_exit(keytouch_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jiri Kosina");