HID: roccat: remove obsolete kone_abi_version sysfs attribute

The newest version of the accompanying userland tools cuts backward
compatibility and uses libudev to find its devices superseding the
quirky kone_abi_version sysfs attribute. Therefore it should be removed.
Signed-off-by: Stefan Achatz <erazor_de@users.sourceforge.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Documentation/ABI/testing/sysfs-driver-hid-roccat-kone

@@ -33,18 +33,6 @@ Description:	When read, this file returns the raw integer version number of the
 		left. E.g. a returned value of 138 means 1.38
 		This file is readonly.
 
-What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/kone_abi_version
-Date:		May 2010
-Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
-Description:	When read, this file returns the abi version as an integer value.
-		This attribute is used by the userland tools to find the sysfs-
-		paths of installed kone-mice and determine the capabilites of
-		the driver. Versions of this driver for old kernels replace
-		usbhid instead of generic-usb. The way to scan for this file
-		has been chosen to provide a consistent way for all supported
-		kernel versions.
-		This file is readonly.
-
 What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/profile[1-5]
 Date:		March 2010
 Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>

drivers/hid/hid-roccat-kone.c

@@ -617,18 +617,6 @@ static ssize_t kone_sysfs_set_startup_profile(struct device *dev,
 	return size;
 }
 
-/*
- * This file is used by userland software to find devices that are handled by
- * this driver. This provides a consistent way for actual and older kernels
- * where this driver replaced usbhid instead of generic-usb.
- * Driver capabilities are determined by returned number.
- */
-static ssize_t kone_sysfs_show_abi_version(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	return snprintf(buf, PAGE_SIZE, ROCCAT_KONE_ABI_VERSION "\n");
-}
-
 /*
  * Read actual dpi settings.
  * Returns raw value for further processing. Refer to enum kone_polling_rates to
@@ -666,9 +654,6 @@ static DEVICE_ATTR(startup_profile, 0660,
 		kone_sysfs_show_startup_profile,
 		kone_sysfs_set_startup_profile);
 
-static DEVICE_ATTR(kone_abi_version, 0440,
-		kone_sysfs_show_abi_version, NULL);
-
 static struct attribute *kone_attributes[] = {
 		&dev_attr_actual_dpi.attr,
 		&dev_attr_actual_profile.attr,
@@ -676,7 +661,6 @@ static struct attribute *kone_attributes[] = {
 		&dev_attr_firmware_version.attr,
 		&dev_attr_tcu.attr,
 		&dev_attr_startup_profile.attr,
-		&dev_attr_kone_abi_version.attr,
 		NULL
 };
 

drivers/hid/hid-roccat-kone.h

@@ -14,8 +14,6 @@
 
 #include <linux/types.h>
 
-#define ROCCAT_KONE_ABI_VERSION "1"
-
 #pragma pack(push)
 #pragma pack(1)