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1/* SPDX-License-Identifier: GPL-2.0 */2/**3 nsc_gpio.c4 5 National Semiconductor GPIO common access methods.6 7 struct nsc_gpio_ops abstracts the low-level access8 operations for the GPIO units on 2 NSC chip families; the GEODE9 integrated CPU, and the PC-8736[03456] integrated PC-peripheral10 chips.11 12 The GPIO units on these chips have the same pin architecture, but13 the access methods differ. Thus, scx200_gpio and pc8736x_gpio14 implement their own versions of these routines; and use the common15 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 42