[PATCH] chardev: GPIO for SCx200 & PC-8736x: add platforn_device for use w dev_dbg
Add a platform-device to scx200_gpio, and use its struct device dev member
(ie: devp) in dev_dbg() once.
There are 2 alternatives here (Im soliciting guidance/commentary):
- use isa_device, if/when its added to the kernel.
- alter scx200.c to EXPORT_GPL its private devp so that both scx200_gpio,
and the (to be added) nsc_gpio module can use it. Since the available devp
is in 'grandparent', this seems like too much 'action at a distance'.
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Cc: Greg KH <greg@kroah.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 507a5bf..e6e52c4 100644
--- a/drivers/char/scx200_gpio.c
+++ b/drivers/char/scx200_gpio.c
@@ -6,11 +6,13 @@
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>
@@ -20,6 +22,9 @@
#include <linux/scx200_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");
@@ -114,56 +119,70 @@
};
struct cdev *scx200_devices;
-int num_devs = 32;
+static int num_pins = 32;
static int __init scx200_gpio_init(void)
{
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 present\n");
return -ENODEV;
}
+
+ /* 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_devs, "scx200_gpio");
+ rc = register_chrdev_region(dev, num_pins, "scx200_gpio");
else {
- rc = alloc_chrdev_region(&dev, 0, num_devs, "scx200_gpio");
+ rc = alloc_chrdev_region(&dev, 0, num_pins, "scx200_gpio");
major = MAJOR(dev);
}
if (rc < 0) {
- printk(KERN_ERR NAME ": SCx200 chrdev_region: %d\n", rc);
- return rc;
+ dev_err(&pdev->dev, "SCx200 chrdev_region err: %d\n", rc);
+ goto undo_platform_device_add;
}
- scx200_devices = kzalloc(num_devs * sizeof(struct cdev), GFP_KERNEL);
+ scx200_devices = kzalloc(num_pins * sizeof(struct cdev), GFP_KERNEL);
if (!scx200_devices) {
rc = -ENOMEM;
- goto fail_malloc;
+ goto undo_chrdev_region;
}
- for (i = 0; i < num_devs; i++) {
+ for (i = 0; i < num_pins; 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 */
+ /* tolerate 'minor' errors */
if (rc)
- printk(KERN_ERR NAME "Error %d on minor %d", rc, i);
+ dev_err(&pdev->dev, "Error %d on minor %d", rc, i);
}
- return 0; /* succeed */
+ return 0; /* succeed */
-fail_malloc:
- unregister_chrdev_region(dev, num_devs);
+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)
{
kfree(scx200_devices);
- unregister_chrdev_region(MKDEV(major, 0), num_devs);
+ unregister_chrdev_region(MKDEV(major, 0), num_pins);
+ platform_device_put(pdev);
+ platform_device_unregister(pdev);
+ /* kfree(pdev); */
}
module_init(scx200_gpio_init);
