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/* SPDX-License-Identifier: GPL-2.0 */
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
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 <>
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);