GPIO SUPPORT FOR SCx200 & PC8736x
This patch-set reworks the 2.4 vintage scx200_gpio driver for modern
2.6, and refactors GPIO support to reuse it in a new driver for the
GPIO on PC-8736x chips.
09/19. patch.access-vtable
Abstract the gpio operations into the nsc_gpio_ops vtable. This
vtable will (later) be shared via filp->private_data, since it has
everything to handle the commands sent by the file-ops handlers.
Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx>
diffstat patch.access-vtable
drivers/char/scx200_gpio.c | 13 +++++++++++++
include/linux/nsc_gpio.h | 33 +++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)
diff -ruNp -X dontdiff -X exclude-diffs k16r-8/drivers/char/scx200_gpio.c
k16r-9/drivers/char/scx200_gpio.c
--- k16r-8/drivers/char/scx200_gpio.c 2006-05-28 12:20:50.000000000 -0600
+++ k16r-9/drivers/char/scx200_gpio.c 2006-05-28 12:21:21.000000000 -0600
@@ -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 nu
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)
{
diff -ruNp -X dontdiff -X exclude-diffs k16r-8/include/linux/nsc_gpio.h
k16r-9/include/linux/nsc_gpio.h
--- k16r-8/include/linux/nsc_gpio.h 1969-12-31 17:00:00.000000000 -0700
+++ k16r-9/include/linux/nsc_gpio.h 2006-05-28 12:21:21.000000000 -0600
@@ -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@xxxxxxxxx>
+
+ 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);
+};
+
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