include/linux/nsc_gpio.h

   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
  22 struct 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
  33 extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
  34                               size_t len, loff_t *ppos);
  35
  36 extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
  37                              size_t len, loff_t *ppos);
  38
  39 extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);
  40