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/**

   nsc_gpio.c

   National Semiconductor GPIO common access methods.

   struct nsc_gpio_ops abstracts the low-level access

   operations for the GPIO units on 2 NSC chip families; the GEODE

   integrated CPU, and the PC-8736[03456] integrated PC-peripheral

   chips.

   The GPIO units on these chips have the same pin architecture, but

   the access methods differ.  Thus, scx200_gpio and pc8736x_gpio

   implement their own versions of these routines; and use the common

   file-operations routines implemented in nsc_gpio module.

   Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>

   NB: this work was tested on the Geode SC-1100 and PC-87366 chips.

   NSC sold the GEODE line to AMD, and the PC-8736x line to Winbond.

*/

struct nsc_gpio_ops {

        struct module*  owner;

        u32     (*gpio_config)  (unsigned iminor, u32 mask, u32 bits);

        void    (*gpio_dump)    (struct nsc_gpio_ops *amp, unsigned iminor);

        int     (*gpio_get)     (unsigned iminor);

        void    (*gpio_set)     (unsigned iminor, int state);

        void    (*gpio_change)  (unsigned iminor);

        int     (*gpio_current) (unsigned iminor);

        struct device*  dev;    /* for dev_dbg() support, set in init  */

};

extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,

                              size_t len, loff_t *ppos);

extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,

                             size_t len, loff_t *ppos);

extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);