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