[PATCH] chardev: GPIO for SCx200 & PC-8736x: add gpio-ops vtable

Abstract the gpio operations into a new nsc_gpio_ops vtable.
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/scx200_gpio.c

@@ -20,6 +20,7 @@
 #include <linux/cdev.h>
 
 #include <linux/scx200_gpio.h>
+#include <linux/nsc_gpio.h>
 
 #define NAME "scx200_gpio"
 #define DEVNAME NAME
@@ -36,6 +37,18 @@ MODULE_PARM_DESC(major, "Major device number");
 
 extern void scx200_gpio_dump(unsigned index);
 
+struct nsc_gpio_ops scx200_access = {
+	.owner		= THIS_MODULE,
+	.gpio_config	= scx200_gpio_configure,
+	.gpio_dump	= scx200_gpio_dump,
+	.gpio_get	= scx200_gpio_get,
+	.gpio_set	= scx200_gpio_set,
+	.gpio_set_high	= scx200_gpio_set_high,
+	.gpio_set_low	= scx200_gpio_set_low,
+	.gpio_change	= scx200_gpio_change,
+	.gpio_current	= scx200_gpio_current
+};
+
 static ssize_t scx200_gpio_write(struct file *file, const char __user *data,
 				 size_t len, loff_t *ppos)
 {

include/linux/nsc_gpio.h

+/**
+   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)	(unsigned iminor);
+	int	(*gpio_get)	(unsigned iminor);
+	void	(*gpio_set)	(unsigned iminor, int state);
+	void	(*gpio_set_high)(unsigned iminor);
+	void	(*gpio_set_low)	(unsigned iminor);
+	void	(*gpio_change)	(unsigned iminor);
+	int	(*gpio_current)	(unsigned iminor);
+};
+