include/linux/nsc_gpio.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /**
0003    nsc_gpio.c
0004
0005    National Semiconductor GPIO common access methods.
0006
0007    struct nsc_gpio_ops abstracts the low-level access
0008    operations for the GPIO units on 2 NSC chip families; the GEODE
0009    integrated CPU, and the PC-8736[03456] integrated PC-peripheral
0010    chips.
0011
0012    The GPIO units on these chips have the same pin architecture, but
0013    the access methods differ.  Thus, scx200_gpio and pc8736x_gpio
0014    implement their own versions of these routines; and use the common
0015    file-operations routines implemented in nsc_gpio module.
0016
0017    Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
0018
0019    NB: this work was tested on the Geode SC-1100 and PC-87366 chips.
0020    NSC sold the GEODE line to AMD, and the PC-8736x line to Winbond.
0021 */
0022
0023 struct nsc_gpio_ops {
0024     struct module*  owner;
0025     u32 (*gpio_config)  (unsigned iminor, u32 mask, u32 bits);
0026     void    (*gpio_dump)    (struct nsc_gpio_ops *amp, unsigned iminor);
0027     int (*gpio_get) (unsigned iminor);
0028     void    (*gpio_set) (unsigned iminor, int state);
0029     void    (*gpio_change)  (unsigned iminor);
0030     int (*gpio_current) (unsigned iminor);
0031     struct device*  dev;    /* for dev_dbg() support, set in init  */
0032 };
0033
0034 extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
0035                   size_t len, loff_t *ppos);
0036
0037 extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
0038                  size_t len, loff_t *ppos);
0039
0040 extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);
0041