National Semiconductor PC8736x GPIO driver. Allows a user space
process to play with the GPIO pins.
- Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
+ Copyright (c) 2005,2006 Jim Cromie <jim.cromie@gmail.com>
adapted from linux/drivers/char/scx200_gpio.c
Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>,
*/
-#include <linux/config.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
+#include <linux/cdev.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/mutex.h>
#define DEVNAME "pc8736x_gpio"
MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
-MODULE_DESCRIPTION("NatSemi PC-8736x GPIO Pin Driver");
+MODULE_DESCRIPTION("NatSemi/Winbond PC-8736x GPIO Pin Driver");
MODULE_LICENSE("GPL");
static int major; /* default to dynamic major */
#define SIO_BASE1 0x2E /* 1st command-reg to check */
#define SIO_BASE2 0x4E /* alt command-reg to check */
-#define SIO_BASE_OFFSET 0x20
#define SIO_SID 0x20 /* SuperI/O ID Register */
#define SIO_SID_VALUE 0xe9 /* Expected value in SuperI/O ID Register */
#define SIO_CF1 0x21 /* chip config, bit0 is chip enable */
-#define PC8736X_GPIO_SIZE 16
+#define PC8736X_GPIO_RANGE 16 /* ioaddr range */
+#define PC8736X_GPIO_CT 32 /* minors matching 4 8 bit ports */
#define SIO_UNIT_SEL 0x7 /* unit select reg */
#define SIO_UNIT_ACT 0x30 /* unit enable */
pc8736x_gpio_shadow[port] = val;
}
-static void pc8736x_gpio_set_high(unsigned index)
-{
- pc8736x_gpio_set(index, 1);
-}
-
-static void pc8736x_gpio_set_low(unsigned index)
-{
- pc8736x_gpio_set(index, 0);
-}
-
static int pc8736x_gpio_current(unsigned minor)
{
int port, bit;
pc8736x_gpio_set(index, !pc8736x_gpio_current(index));
}
-static struct nsc_gpio_ops pc8736x_access = {
+static struct nsc_gpio_ops pc8736x_gpio_ops = {
.owner = THIS_MODULE,
.gpio_config = pc8736x_gpio_configure,
.gpio_dump = nsc_gpio_dump,
.gpio_get = pc8736x_gpio_get,
.gpio_set = pc8736x_gpio_set,
- .gpio_set_high = pc8736x_gpio_set_high,
- .gpio_set_low = pc8736x_gpio_set_low,
.gpio_change = pc8736x_gpio_change,
.gpio_current = pc8736x_gpio_current
};
static int pc8736x_gpio_open(struct inode *inode, struct file *file)
{
unsigned m = iminor(inode);
- file->private_data = &pc8736x_access;
+ file->private_data = &pc8736x_gpio_ops;
dev_dbg(&pdev->dev, "open %d\n", m);
- if (m > 63)
+ if (m >= PC8736X_GPIO_CT)
return -EINVAL;
return nonseekable_open(inode, file);
}
-static struct file_operations pc8736x_gpio_fops = {
+static const struct file_operations pc8736x_gpio_fileops = {
.owner = THIS_MODULE,
.open = pc8736x_gpio_open,
.write = nsc_gpio_write,
}
+static struct cdev pc8736x_gpio_cdev;
+
static int __init pc8736x_gpio_init(void)
{
- int rc = 0;
+ int rc;
+ dev_t devid;
pdev = platform_device_alloc(DEVNAME, 0);
if (!pdev)
dev_err(&pdev->dev, "no device found\n");
goto undo_platform_dev_add;
}
- pc8736x_access.dev = &pdev->dev;
+ pc8736x_gpio_ops.dev = &pdev->dev;
/* Verify that chip and it's GPIO unit are both enabled.
My BIOS does this, so I take minimum action here
pc8736x_gpio_base = (superio_inb(SIO_BASE_HADDR) << 8
| superio_inb(SIO_BASE_LADDR));
- if (!request_region(pc8736x_gpio_base, 16, DEVNAME)) {
+ if (!request_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE, DEVNAME)) {
rc = -ENODEV;
dev_err(&pdev->dev, "GPIO ioport %x busy\n",
pc8736x_gpio_base);
}
dev_info(&pdev->dev, "GPIO ioport %x reserved\n", pc8736x_gpio_base);
- rc = register_chrdev(major, DEVNAME, &pc8736x_gpio_fops);
+ if (major) {
+ devid = MKDEV(major, 0);
+ rc = register_chrdev_region(devid, PC8736X_GPIO_CT, DEVNAME);
+ } else {
+ rc = alloc_chrdev_region(&devid, 0, PC8736X_GPIO_CT, DEVNAME);
+ major = MAJOR(devid);
+ }
+
if (rc < 0) {
dev_err(&pdev->dev, "register-chrdev failed: %d\n", rc);
- goto undo_platform_dev_add;
+ goto undo_request_region;
}
if (!major) {
major = rc;
}
pc8736x_init_shadow();
+
+ /* ignore minor errs, and succeed */
+ cdev_init(&pc8736x_gpio_cdev, &pc8736x_gpio_fileops);
+ cdev_add(&pc8736x_gpio_cdev, devid, PC8736X_GPIO_CT);
+
return 0;
+undo_request_region:
+ release_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE);
undo_platform_dev_add:
platform_device_del(pdev);
undo_platform_dev_alloc:
static void __exit pc8736x_gpio_cleanup(void)
{
- dev_dbg(&pdev->dev, " cleanup\n");
+ dev_dbg(&pdev->dev, "cleanup\n");
- release_region(pc8736x_gpio_base, 16);
+ cdev_del(&pc8736x_gpio_cdev);
+ unregister_chrdev_region(MKDEV(major,0), PC8736X_GPIO_CT);
+ release_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE);
- unregister_chrdev(major, DEVNAME);
+ platform_device_del(pdev);
+ platform_device_put(pdev);
}
-EXPORT_SYMBOL(pc8736x_access);
-
module_init(pc8736x_gpio_init);
module_exit(pc8736x_gpio_cleanup);