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 
23 struct 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 
34 extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
35 			      size_t len, loff_t *ppos);
36 
37 extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
38 			     size_t len, loff_t *ppos);
39 
40 extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);
41 
42