include/linux/nsc_gpio.h

   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