Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> */
#include <linux/config.h>
+#include <linux/device.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
+#include <linux/platform_device.h>
#include <asm/uaccess.h>
#include <asm/io.h>
+#include <linux/types.h>
+#include <linux/cdev.h>
+
#include <linux/scx200_gpio.h>
+#include <linux/nsc_gpio.h>
#define NAME "scx200_gpio"
+#define DEVNAME NAME
+
+static struct platform_device *pdev;
MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
MODULE_DESCRIPTION("NatSemi SCx200 GPIO Pin Driver");
module_param(major, int, 0);
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)
{
unsigned m = iminor(file->f_dentry->d_inode);
+ struct nsc_gpio_ops *amp = file->private_data;
size_t i;
+ int err = 0;
for (i = 0; i < len; ++i) {
char c;
return -EFAULT;
switch (c) {
case '0':
- scx200_gpio_set(m, 0);
+ amp->gpio_set(m, 0);
break;
case '1':
- scx200_gpio_set(m, 1);
+ amp->gpio_set(m, 1);
break;
case 'O':
printk(KERN_INFO NAME ": GPIO%d output enabled\n", m);
- scx200_gpio_configure(m, ~1, 1);
+ amp->gpio_config(m, ~1, 1);
break;
case 'o':
printk(KERN_INFO NAME ": GPIO%d output disabled\n", m);
- scx200_gpio_configure(m, ~1, 0);
+ amp->gpio_config(m, ~1, 0);
break;
case 'T':
printk(KERN_INFO NAME ": GPIO%d output is push pull\n", m);
- scx200_gpio_configure(m, ~2, 2);
+ amp->gpio_config(m, ~2, 2);
break;
case 't':
printk(KERN_INFO NAME ": GPIO%d output is open drain\n", m);
- scx200_gpio_configure(m, ~2, 0);
+ amp->gpio_config(m, ~2, 0);
break;
case 'P':
printk(KERN_INFO NAME ": GPIO%d pull up enabled\n", m);
- scx200_gpio_configure(m, ~4, 4);
+ amp->gpio_config(m, ~4, 4);
break;
case 'p':
printk(KERN_INFO NAME ": GPIO%d pull up disabled\n", m);
- scx200_gpio_configure(m, ~4, 0);
+ amp->gpio_config(m, ~4, 0);
break;
+
+ case 'v':
+ /* View Current pin settings */
+ amp->gpio_dump(m);
+ break;
+ case '\n':
+ /* end of settings string, do nothing */
+ break;
+ default:
+ printk(KERN_ERR NAME
+ ": GPIO-%2d bad setting: chr<0x%2x>\n", m,
+ (int)c);
+ err++;
}
}
+ if (err)
+ return -EINVAL; /* full string handled, report error */
return len;
}
{
unsigned m = iminor(file->f_dentry->d_inode);
int value;
+ struct nsc_gpio_ops *amp = file->private_data;
- value = scx200_gpio_get(m);
+ value = amp->gpio_get(m);
if (put_user(value ? '1' : '0', buf))
return -EFAULT;
static int scx200_gpio_open(struct inode *inode, struct file *file)
{
unsigned m = iminor(inode);
+ file->private_data = &scx200_access;
+
if (m > 63)
return -EINVAL;
return nonseekable_open(inode, file);
.release = scx200_gpio_release,
};
+struct cdev *scx200_devices;
+static int num_pins = 32;
+
static int __init scx200_gpio_init(void)
{
- int r;
-
- printk(KERN_DEBUG NAME ": NatSemi SCx200 GPIO Driver\n");
+ int rc, i;
+ dev_t dev = MKDEV(major, 0);
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;
+ /* support dev_dbg() with pdev->dev */
+ pdev = platform_device_alloc(DEVNAME, 0);
+ if (!pdev)
+ return -ENOMEM;
+
+ rc = platform_device_add(pdev);
+ if (rc)
+ goto undo_malloc;
+
+ if (major)
+ rc = register_chrdev_region(dev, num_pins, "scx200_gpio");
+ else {
+ rc = alloc_chrdev_region(&dev, 0, num_pins, "scx200_gpio");
+ major = MAJOR(dev);
}
- if (!major) {
- major = r;
- printk(KERN_DEBUG NAME ": got dynamic major %d\n", major);
+ if (rc < 0) {
+ dev_err(&pdev->dev, "SCx200 chrdev_region err: %d\n", rc);
+ goto undo_platform_device_add;
+ }
+ scx200_devices = kzalloc(num_pins * sizeof(struct cdev), GFP_KERNEL);
+ if (!scx200_devices) {
+ rc = -ENOMEM;
+ goto undo_chrdev_region;
+ }
+ for (i = 0; i < num_pins; i++) {
+ struct cdev *cdev = &scx200_devices[i];
+ cdev_init(cdev, &scx200_gpio_fops);
+ cdev->owner = THIS_MODULE;
+ rc = cdev_add(cdev, MKDEV(major, i), 1);
+ /* tolerate 'minor' errors */
+ if (rc)
+ dev_err(&pdev->dev, "Error %d on minor %d", rc, i);
}
- return 0;
+ return 0; /* succeed */
+
+undo_chrdev_region:
+ unregister_chrdev_region(dev, num_pins);
+undo_platform_device_add:
+ platform_device_put(pdev);
+undo_malloc:
+ kfree(pdev);
+ return rc;
}
static void __exit scx200_gpio_cleanup(void)
{
- unregister_chrdev(major, NAME);
+ kfree(scx200_devices);
+ unregister_chrdev_region(MKDEV(major, 0), num_pins);
+ platform_device_put(pdev);
+ platform_device_unregister(pdev);
+ /* kfree(pdev); */
}
module_init(scx200_gpio_init);
git.openpandora.org / pandora-kernel.git / blobdiff