/* 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);