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[PATCH] chardev: GPIO for SCx200 & PC-8736x: modernize driver init to 2.6 api 

Adopt many modern 2.6 coding practices, ala LDD3, chapter 3.  Changes are
limited to initialization calls from module init, ie: cdev_init, cdev_add,
*_chrdev_region, mkdev.

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>
hifive-unleashed-5.1
Jim Cromie 2006-06-27 02:54:14 -07:00 committed by Linus Torvalds
parent 62c83cde92
commit 7d7f212661
1 changed files with 41 additions and 12 deletions
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53
drivers/char/scx200_gpio.c
View File

@ -14,6 +14,9 @@
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/types.h>
#include <linux/cdev.h>
#include <linux/scx200_gpio.h>
#define NAME "scx200_gpio"
@ -26,6 +29,8 @@ static int major = 0; /* default to dynamic major */
module_param(major, int, 0);
MODULE_PARM_DESC(major, "Major device number");
extern void scx200_gpio_dump(unsigned index);
static ssize_t scx200_gpio_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
{
@ -108,33 +113,57 @@ static struct file_operations scx200_gpio_fops = {
.release = scx200_gpio_release,
};
struct cdev *scx200_devices;
int num_devs = 32;
static int __init scx200_gpio_init(void)
{
int r;
int rc, i;
dev_t dev = MKDEV(major, 0);
printk(KERN_DEBUG NAME ": NatSemi SCx200 GPIO Driver\n");
if (!scx200_gpio_present()) {
printk(KERN_ERR NAME ": no SCx200 gpio pins available\n");
printk(KERN_ERR NAME ": no SCx200 gpio present\n");
return -ENODEV;
}
r = register_chrdev(major, NAME, &scx200_gpio_fops);
if (r < 0) {
printk(KERN_ERR NAME ": unable to register character device\n");
return r;
if (major)
rc = register_chrdev_region(dev, num_devs, "scx200_gpio");
else {
rc = alloc_chrdev_region(&dev, 0, num_devs, "scx200_gpio");
major = MAJOR(dev);
}
if (!major) {
major = r;
printk(KERN_DEBUG NAME ": got dynamic major %d\n", major);
if (rc < 0) {
printk(KERN_ERR NAME ": SCx200 chrdev_region: %d\n", rc);
return rc;
}
scx200_devices = kzalloc(num_devs * sizeof(struct cdev), GFP_KERNEL);
if (!scx200_devices) {
rc = -ENOMEM;
goto fail_malloc;
}
for (i = 0; i < num_devs; i++) {
struct cdev *cdev = &scx200_devices[i];
cdev_init(cdev, &scx200_gpio_fops);
cdev->owner = THIS_MODULE;
cdev->ops = &scx200_gpio_fops;
rc = cdev_add(cdev, MKDEV(major, i), 1);
/* Fail gracefully if need be */
if (rc)
printk(KERN_ERR NAME "Error %d on minor %d", rc, i);
}
return 0;
return 0; /* succeed */
fail_malloc:
unregister_chrdev_region(dev, num_devs);
return rc;
}
static void __exit scx200_gpio_cleanup(void)
{
unregister_chrdev(major, NAME);
kfree(scx200_devices);
unregister_chrdev_region(MKDEV(major, 0), num_devs);
}
module_init(scx200_gpio_init);