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