/* -*- mode: c; c-basic-offset: 8 -*- */
  
  /* This is the function prototypes for the old legacy MCA interface
   *
   * Please move your driver to the new sysfs based one instead */
  
  #ifndef _LINUX_MCA_LEGACY_H
  #define _LINUX_MCA_LEGACY_H
  
  #include <linux/mca.h>
  
  #warning "MCA legacy - please move your driver to the new sysfs api"
  
  /* MCA_NOTFOUND is an error condition.  The other two indicate
   * motherboard POS registers contain the adapter.  They might be
   * returned by the mca_find_adapter() function, and can be used as
   * arguments to mca_read_stored_pos().  I'm not going to allow direct
   * access to the motherboard registers until we run across an adapter
   * that requires it.  We don't know enough about them to know if it's
   * safe.
   *
   * See Documentation/mca.txt or one of the existing drivers for
   * more information.
   */
  #define MCA_NOTFOUND	(-1)
  
  
  
  /* Returns the slot of the first enabled adapter matching id.  User can
   * specify a starting slot beyond zero, to deal with detecting multiple
   * devices.  Returns MCA_NOTFOUND if id not found.  Also checks the
   * integrated adapters.
   */
  extern int mca_find_adapter(int id, int start);
  extern int mca_find_unused_adapter(int id, int start);

  extern int mca_mark_as_used(int slot);
  extern void mca_mark_as_unused(int slot);
  
  /* gets a byte out of POS register (stored in memory) */
  extern unsigned char mca_read_stored_pos(int slot, int reg);
  
  /* This can be expanded later.  Right now, it gives us a way of
   * getting meaningful information into the MCA_info structure,
   * so we can have a more interesting /proc/mca.
   */
  extern void mca_set_adapter_name(int slot, char* name);
  
  /* These routines actually mess with the hardware POS registers.  They
   * temporarily disable the device (and interrupts), so make sure you know
   * what you're doing if you use them.  Furthermore, writing to a POS may
   * result in two devices trying to share a resource, which in turn can
   * result in multiple devices sharing memory spaces, IRQs, or even trashing
   * hardware.  YOU HAVE BEEN WARNED.
   *
   * You can only access slots with this.  Motherboard registers are off
   * limits.
   */
  
  /* read a byte from the specified POS register. */
  extern unsigned char mca_read_pos(int slot, int reg);
  
  /* write a byte to the specified POS register. */
  extern void mca_write_pos(int slot, int reg, unsigned char byte);
  
  #endif