linux/include/linux/nsc_gpio.h
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   1/**
   2   nsc_gpio.c
   3
   4   National Semiconductor GPIO common access methods.
   5
   6   struct nsc_gpio_ops abstracts the low-level access
   7   operations for the GPIO units on 2 NSC chip families; the GEODE
   8   integrated CPU, and the PC-8736[03456] integrated PC-peripheral
   9   chips.
  10
  11   The GPIO units on these chips have the same pin architecture, but
  12   the access methods differ.  Thus, scx200_gpio and pc8736x_gpio
  13   implement their own versions of these routines; and use the common
  14   file-operations routines implemented in nsc_gpio module.
  15
  16   Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
  17
  18   NB: this work was tested on the Geode SC-1100 and PC-87366 chips.
  19   NSC sold the GEODE line to AMD, and the PC-8736x line to Winbond.
  20*/
  21
  22struct nsc_gpio_ops {
  23        struct module*  owner;
  24        u32     (*gpio_config)  (unsigned iminor, u32 mask, u32 bits);
  25        void    (*gpio_dump)    (struct nsc_gpio_ops *amp, unsigned iminor);
  26        int     (*gpio_get)     (unsigned iminor);
  27        void    (*gpio_set)     (unsigned iminor, int state);
  28        void    (*gpio_change)  (unsigned iminor);
  29        int     (*gpio_current) (unsigned iminor);
  30        struct device*  dev;    /* for dev_dbg() support, set in init  */
  31};
  32
  33extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
  34                              size_t len, loff_t *ppos);
  35
  36extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
  37                             size_t len, loff_t *ppos);
  38
  39extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);
  40
  41
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