#ifndef __LINUX_MDIO_BITBANG_H
  #define __LINUX_MDIO_BITBANG_H
  
  #include <linux/phy.h>

  
  struct module;

  
  struct mdiobb_ctrl;
  
  struct mdiobb_ops {
  	struct module *owner;
  
  	/* Set the Management Data Clock high if level is one,
  	 * low if level is zero.
  	 */
  	void (*set_mdc)(struct mdiobb_ctrl *ctrl, int level);
  
  	/* Configure the Management Data I/O pin as an input if
  	 * "output" is zero, or an output if "output" is one.
  	 */
  	void (*set_mdio_dir)(struct mdiobb_ctrl *ctrl, int output);
  
  	/* Set the Management Data I/O pin high if value is one,
  	 * low if "value" is zero.  This may only be called
  	 * when the MDIO pin is configured as an output.
  	 */
  	void (*set_mdio_data)(struct mdiobb_ctrl *ctrl, int value);
  
  	/* Retrieve the state Management Data I/O pin. */
  	int (*get_mdio_data)(struct mdiobb_ctrl *ctrl);
  };
  
  struct mdiobb_ctrl {
  	const struct mdiobb_ops *ops;

  	/* reset callback */
  	int (*reset)(struct mii_bus *bus);

  };
  
  /* The returned bus is not yet registered with the phy layer. */
  struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
  
  /* The bus must already have been unregistered. */
  void free_mdio_bitbang(struct mii_bus *bus);
  
  #endif