/**
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 <[email protected]>

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);