[PATCH] scx200_gpio: use 1 cdev for N minors, not N for N

Remove the scx200_gpio's cdev-array & ksalloc, replacing it with a single
static struct cdev, which is sufficient for all the pins.

cdev_put is commented out since kernel wont link properly with it, and its
apparently not needed.

With these patches, this driver continues to work with Chris Boot's
leds_48xx driver.

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>

diff --git a/drivers/char/scx200_gpio.c b/drivers/char/scx200_gpio.c
index e7665c1..dd1f997 100644 (file)
--- a/drivers/char/scx200_gpio.c
+++ b/drivers/char/scx200_gpio.c
@@ -63,7 +63,6 @@ static int scx200_gpio_release(struct inode *inode, struct file *file)
        return 0;
 }
 
-
 static const struct file_operations scx200_gpio_fops = {
        .owner   = THIS_MODULE,
        .write   = nsc_gpio_write,
@@ -72,11 +71,11 @@ static const struct file_operations scx200_gpio_fops = {
        .release = scx200_gpio_release,
 };
 
-struct cdev *scx200_devices;
+struct cdev scx200_gpio_cdev;  /* use 1 cdev for all pins */
 
 static int __init scx200_gpio_init(void)
 {
-       int rc, i;
+       int rc;
        dev_t devid;
 
        if (!scx200_gpio_present()) {
@@ -107,25 +106,12 @@ static int __init scx200_gpio_init(void)
                dev_err(&pdev->dev, "SCx200 chrdev_region err: %d\n", rc);
                goto undo_platform_device_add;
        }
-       scx200_devices = kzalloc(MAX_PINS * sizeof(struct cdev), GFP_KERNEL);
-       if (!scx200_devices) {
-               rc = -ENOMEM;
-               goto undo_chrdev_region;
-       }
-       for (i = 0; i < MAX_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);
-       }
+
+       cdev_init(&scx200_gpio_cdev, &scx200_gpio_fops);
+       cdev_add(&scx200_gpio_cdev, devid, MAX_PINS);
 
        return 0; /* succeed */
 
-undo_chrdev_region:
-       unregister_chrdev_region(devid, MAX_PINS);
 undo_platform_device_add:
        platform_device_del(pdev);
 undo_malloc:
@@ -136,7 +122,9 @@ undo_malloc:
 
 static void __exit scx200_gpio_cleanup(void)
 {
-       kfree(scx200_devices);
+       cdev_del(&scx200_gpio_cdev);
+       /* cdev_put(&scx200_gpio_cdev); */
+
        unregister_chrdev_region(MKDEV(major, 0), MAX_PINS);
        platform_device_unregister(pdev);
 }