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Commit fe3a168a authored by Jim Cromie's avatar Jim Cromie Committed by Linus Torvalds
Browse files

[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: default avatarJim Cromie <jim.cromie@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 9b170b8f

drivers/char/scx200_gpio.c

+13 −0
Original line number Diff line number Diff line
@@ -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

0 → 100644
+33 −0
Original line number Diff line number Diff line 
/**

   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);

};