staging: comedi: don't expose comedi_device_{attach,detach}

These functions are only used by the comedi core. Move the
prototypes to comedi_internal.h so they are not exposed to
the comedi drivers.

Tidy up comedi_internal.h a bit so that all the internal stuff
in drivers.c is grouped.

Signed-off-by: H Hartley Sweeten <[e-mail]>
Cc: Ian Abbott <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/comedi/comedi_internal.h

···
  */
 int do_rangeinfo_ioctl(struct comedi_device *dev,
 		       struct comedi_rangeinfo __user *arg);
-int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s,
-	       struct comedi_insn *insn, unsigned int *data);
 int comedi_alloc_board_minor(struct device *hardware_device);
 void comedi_free_board_minor(unsigned minor);
 int comedi_find_board_minor(struct device *hardware_device);
···
 extern unsigned int comedi_default_buf_size_kb;
 extern unsigned int comedi_default_buf_maxsize_kb;
 extern bool comedi_autoconfig;
+
+/* drivers.c */
+
 extern struct comedi_driver *comedi_drivers;
+
+int insn_inval(struct comedi_device *, struct comedi_subdevice *,
+	       struct comedi_insn *, unsigned int *);
+
+void comedi_device_detach(struct comedi_device *);
+int comedi_device_attach(struct comedi_device *, struct comedi_devconfig *);
 
 #endif /* _COMEDI_INTERNAL_H */

drivers/staging/comedi/comedidev.h

···
 
 int comedi_alloc_subdevices(struct comedi_device *, int);
 
-void comedi_device_detach(struct comedi_device *);
-int comedi_device_attach(struct comedi_device *, struct comedi_devconfig *);
-
 int comedi_auto_config(struct device *, struct comedi_driver *,
 		       unsigned long context);
 void comedi_auto_unconfig(struct device *);