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

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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>
This commit is contained in:
Jim Cromie 2006-06-27 02:54:18 -07:00 committed by Linus Torvalds
parent 9b170b8fdb
commit fe3a168a2c
2 changed files with 46 additions and 0 deletions
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13
drivers/char/scx200_gpio.c
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@ -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)
{

33
include/linux/nsc_gpio.h Normal file
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@ -0,0 +1,33 @@
/**
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);
};