hwmon: (ams) Fix permissions on 'joystick' module parameter

We should not allow writes to the 'joystick' module parameters since
writing there will not trigger creation of the input device. Disable
writes since we provide alternative way of enabling input device via
AMS device's sysfs attribute.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/ams/ams-input.c

@@ -20,11 +20,11 @@
 #include "ams.h"
 
 static unsigned int joystick;
-module_param(joystick, bool, 0644);
+module_param(joystick, bool, S_IRUGO);
 MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
 
 static unsigned int invert;
-module_param(invert, bool, 0644);
+module_param(invert, bool, S_IWUSR | S_IRUGO);
 MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
 
 static void ams_idev_poll(struct input_polled_dev *dev)