[PATCH] HID: roccat: Made tcu sysfs attr rw to allow readout of koneplus sensor register data

[Stefan Achatz <erazor_de@users.sourceforge.net>]

tcu sysfs attr was used to only control calibration process so far. Reverse
engineering the firmware revealed direct sensor register access. Allowing
readout of tcu permits usage of this feature.

Signed-off-by: Stefan Achatz <erazor_de@users.sourceforge.net>
---
 .../ABI/testing/sysfs-driver-hid-roccat-koneplus   |    6 +++---
 drivers/hid/hid-roccat-koneplus.c                  |   11 ++++++++++-
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-driver-hid-roccat-koneplus b/Documentation/ABI/testing/sysfs-driver-hid-roccat-koneplus
index 65e6e5d..f9e2a61 100644
--- a/Documentation/ABI/testing/sysfs-driver-hid-roccat-koneplus
+++ b/Documentation/ABI/testing/sysfs-driver-hid-roccat-koneplus
@@ -104,9 +104,9 @@ What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-
 Date:		October 2010
 Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
 Description:	When written a calibration process for the tracking control unit
-		can be initiated/cancelled.
-		The data has to be 3 bytes long.
-		This file is writeonly.
+		can be initiated/cancelled. Also lets one read/write sensor
+		registers.
+		The data has to be 4 bytes long.
 Users:		http://roccat.sourceforge.net
 
 What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/koneplus/roccatkoneplus<minor>/tcu_image
diff --git a/drivers/hid/hid-roccat-koneplus.c b/drivers/hid/hid-roccat-koneplus.c
index f5602fe..c47540a 100644
--- a/drivers/hid/hid-roccat-koneplus.c
+++ b/drivers/hid/hid-roccat-koneplus.c
@@ -222,6 +222,14 @@ static ssize_t koneplus_sysfs_write_tcu(struct file *fp,
 			sizeof(struct koneplus_tcu), KONEPLUS_COMMAND_TCU);
 }
 
+static ssize_t koneplus_sysfs_read_tcu(struct file *fp,
+		struct kobject *kobj, struct bin_attribute *attr, char *buf,
+		loff_t off, size_t count)
+{
+	return koneplus_sysfs_read(fp, kobj, buf, off, count,
+			sizeof(struct koneplus_tcu), KONEPLUS_COMMAND_TCU);
+}
+
 static ssize_t koneplus_sysfs_read_tcu_image(struct file *fp,
 		struct kobject *kobj, struct bin_attribute *attr, char *buf,
 		loff_t off, size_t count)
@@ -426,8 +434,9 @@ static struct bin_attribute koneplus_bin_attributes[] = {
 		.write = koneplus_sysfs_write_sensor
 	},
 	{
-		.attr = { .name = "tcu", .mode = 0220 },
+		.attr = { .name = "tcu", .mode = 0660 },
 		.size = sizeof(struct koneplus_tcu),
+		.read = koneplus_sysfs_read_tcu,
 		.write = koneplus_sysfs_write_tcu
 	},
 	{
-- 
1.7.3.4