nsc_gpio.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/**
 3   nsc_gpio.c
 4
 5   National Semiconductor GPIO common access methods.
 6
 7   struct nsc_gpio_ops abstracts the low-level access
 8   operations for the GPIO units on 2 NSC chip families; the GEODE
 9   integrated CPU, and the PC-8736[03456] integrated PC-peripheral
10   chips.
11
12   The GPIO units on these chips have the same pin architecture, but
13   the access methods differ.  Thus, scx200_gpio and pc8736x_gpio
14   implement their own versions of these routines; and use the common
15   file-operations routines implemented in nsc_gpio module.
16
17   Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
18
19   NB: this work was tested on the Geode SC-1100 and PC-87366 chips.
20   NSC sold the GEODE line to AMD, and the PC-8736x line to Winbond.
21*/
22
23struct nsc_gpio_ops {
24	struct module*	owner;
25	u32	(*gpio_config)	(unsigned iminor, u32 mask, u32 bits);
26	void	(*gpio_dump)	(struct nsc_gpio_ops *amp, unsigned iminor);
27	int	(*gpio_get)	(unsigned iminor);
28	void	(*gpio_set)	(unsigned iminor, int state);
29	void	(*gpio_change)	(unsigned iminor);
30	int	(*gpio_current)	(unsigned iminor);
31	struct device*	dev;	/* for dev_dbg() support, set in init  */
32};
33
34extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
35			      size_t len, loff_t *ppos);
36
37extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
38			     size_t len, loff_t *ppos);
39
40extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);
41