/* SPDX-License-Identifier: GPL-2.0 */
|
/**
|
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);
|
