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/**
* @file me8255.h
*
* @brief Meilhaus PIO 8255 implementation.
* @note Copyright (C) 2006 Meilhaus Electronic GmbH (support@meilhaus.de)
* @author Guenter Gebhardt
*/
#ifndef _ME8255_H_
#define _ME8255_H_
#include "mesubdevice.h"
#include "meslock.h"
#ifdef __KERNEL__
/**
* @brief The 8255 subdevice class.
*/
typedef struct me8255_subdevice {
/* Inheritance */
me_subdevice_t base; /**< The subdevice base class. */
/* Attributes */
spinlock_t subdevice_lock; /**< Spin lock to protect the subdevice from concurrent access. */
int *ctrl_reg_mirror; /**< Pointer to mirror of the control register. */
spinlock_t *ctrl_reg_lock; /**< Spin lock to protect #ctrl_reg and #ctrl_reg_mirror from concurrent access. */
uint32_t device_id; /**< The PCI device id of the device holding the 8255 chip. */
int me8255_idx; /**< The index of the 8255 chip on the device. */
int dio_idx; /**< The index of the DIO port on the 8255 chip. */
unsigned long port_reg; /**< Register to read or write a value from or to the port respectively. */
unsigned long ctrl_reg; /**< Register to configure the 8255 modes. */
} me8255_subdevice_t;
/**
* @brief The constructor to generate a 8255 instance.
*
* @param device_id The kind of Meilhaus device holding the 8255.
* @param reg_base The register base address of the device as returned by the PCI BIOS.
* @param me8255_idx The index of the 8255 chip on the Meilhaus device.
* @param dio_idx The index of the counter inside a 8255 chip.
* @param ctr_reg_mirror Pointer to mirror of control register.
* @param ctrl_reg_lock Pointer to spin lock protecting the 8255 control register and #ctrl_reg_mirror from concurrent access.
*
* @return Pointer to new instance on success.\n
* NULL on error.
*/
me8255_subdevice_t *me8255_constructor(uint32_t device_id,
uint32_t reg_base,
unsigned int me8255_idx,
unsigned int dio_idx,
int *ctrl_reg_mirror,
spinlock_t * ctrl_reg_lock);
#endif
#endif
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