--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/linux/nsc_gpio.h	Sun Jan 11 20:20:11 2009 +0100
@@ -0,0 +1,40 @@
+/**
+   nsc_gpio.c
+
+   National Semiconductor GPIO common access methods.
+
+   struct nsc_gpio_ops abstracts the low-level access
+   operations for the GPIO units on 2 NSC chip families; the GEODE
+   integrated CPU, and the PC-8736[03456] integrated PC-peripheral
+   chips.
+
+   The GPIO units on these chips have the same pin architecture, but
+   the access methods differ.  Thus, scx200_gpio and pc8736x_gpio
+   implement their own versions of these routines; and use the common
+   file-operations routines implemented in nsc_gpio module.
+
+   Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
+
+   NB: this work was tested on the Geode SC-1100 and PC-87366 chips.
+   NSC sold the GEODE line to AMD, and the PC-8736x line to Winbond.
+*/
+
+struct nsc_gpio_ops {
+	struct module*	owner;
+	u32	(*gpio_config)	(unsigned iminor, u32 mask, u32 bits);
+	void	(*gpio_dump)	(struct nsc_gpio_ops *amp, unsigned iminor);
+	int	(*gpio_get)	(unsigned iminor);
+	void	(*gpio_set)	(unsigned iminor, int state);
+	void	(*gpio_change)	(unsigned iminor);
+	int	(*gpio_current)	(unsigned iminor);
+	struct device*	dev;	/* for dev_dbg() support, set in init  */
+};
+
+extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
+			      size_t len, loff_t *ppos);
+
+extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
+			     size_t len, loff_t *ppos);
+
+extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);
+