1 files changed, 70 insertions, 94 deletions

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index bff1afb..a858d2b 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -23,9 +23,10 @@
 #include <linux/sched.h>
 #include <linux/string.h>
 #include <linux/kobject.h>
+#include <linux/cdev.h>
 #include <linux/uio_driver.h>
 
-#define UIO_MAX_DEVICES 255
+#define UIO_MAX_DEVICES		(1U << MINORBITS)
 
 struct uio_device {
 	struct module		*owner;
@@ -41,15 +42,10 @@ struct uio_device {
 };
 
 static int uio_major;
+static struct cdev *uio_cdev;
 static DEFINE_IDR(uio_idr);
 static const struct file_operations uio_fops;
 
-/* UIO class infrastructure */
-static struct uio_class {
-	struct kref kref;
-	struct class *class;
-} *uio_class;
-
 /* Protect idr accesses */
 static DEFINE_MUTEX(minor_lock);
 
@@ -232,45 +228,34 @@ static ssize_t show_name(struct device *dev,
 			 struct device_attribute *attr, char *buf)
 {
 	struct uio_device *idev = dev_get_drvdata(dev);
-	if (idev)
-		return sprintf(buf, "%s\n", idev->info->name);
-	else
-		return -ENODEV;
+	return sprintf(buf, "%s\n", idev->info->name);
 }
-static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 
 static ssize_t show_version(struct device *dev,
 			    struct device_attribute *attr, char *buf)
 {
 	struct uio_device *idev = dev_get_drvdata(dev);
-	if (idev)
-		return sprintf(buf, "%s\n", idev->info->version);
-	else
-		return -ENODEV;
+	return sprintf(buf, "%s\n", idev->info->version);
 }
-static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
 
 static ssize_t show_event(struct device *dev,
 			  struct device_attribute *attr, char *buf)
 {
 	struct uio_device *idev = dev_get_drvdata(dev);
-	if (idev)
-		return sprintf(buf, "%u\n",
-				(unsigned int)atomic_read(&idev->event));
-	else
-		return -ENODEV;
+	return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event));
 }
-static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
 
-static struct attribute *uio_attrs[] = {
-	&dev_attr_name.attr,
-	&dev_attr_version.attr,
-	&dev_attr_event.attr,
-	NULL,
+static struct device_attribute uio_class_attributes[] = {
+	__ATTR(name, S_IRUGO, show_name, NULL),
+	__ATTR(version, S_IRUGO, show_version, NULL),
+	__ATTR(event, S_IRUGO, show_event, NULL),
+	{}
 };
 
-static struct attribute_group uio_attr_grp = {
-	.attrs = uio_attrs,
+/* UIO class infrastructure */
+static struct class uio_class = {
+	.name = "uio",
+	.dev_attrs = uio_class_attributes,
 };
 
 /*
@@ -287,10 +272,6 @@ static int uio_dev_add_attributes(struct uio_device *idev)
 	struct uio_port *port;
 	struct uio_portio *portio;
 
-	ret = sysfs_create_group(&idev->dev->kobj, &uio_attr_grp);
-	if (ret)
-		goto err_group;
-
 	for (mi = 0; mi < MAX_UIO_MAPS; mi++) {
 		mem = &idev->info->mem[mi];
 		if (mem->size == 0)
@@ -358,8 +339,6 @@ err_map:
 		kobject_put(&map->kobj);
 	}
 	kobject_put(idev->map_dir);
-	sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp);
-err_group:
 	dev_err(idev->dev, "error creating sysfs files (%d)\n", ret);
 	return ret;
 }
@@ -385,8 +364,6 @@ static void uio_dev_del_attributes(struct uio_device *idev)
 		kobject_put(&port->portio->kobj);
 	}
 	kobject_put(idev->portio_dir);
-
-	sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp);
 }
 
 static int uio_get_minor(struct uio_device *idev)
@@ -525,7 +502,7 @@ static unsigned int uio_poll(struct file *filep, poll_table *wait)
 	struct uio_listener *listener = filep->private_data;
 	struct uio_device *idev = listener->dev;
 
-	if (idev->info->irq == UIO_IRQ_NONE)
+	if (!idev->info->irq)
 		return -EIO;
 
 	poll_wait(filep, &idev->wait, wait);
@@ -543,7 +520,7 @@ static ssize_t uio_read(struct file *filep, char __user *buf,
 	ssize_t retval;
 	s32 event_count;
 
-	if (idev->info->irq == UIO_IRQ_NONE)
+	if (!idev->info->irq)
 		return -EIO;
 
 	if (count != sizeof(s32))
@@ -591,7 +568,7 @@ static ssize_t uio_write(struct file *filep, const char __user *buf,
 	ssize_t retval;
 	s32 irq_on;
 
-	if (idev->info->irq == UIO_IRQ_NONE)
+	if (!idev->info->irq)
 		return -EIO;
 
 	if (count != sizeof(s32))
@@ -740,72 +717,77 @@ static const struct file_operations uio_fops = {
 	.mmap		= uio_mmap,
 	.poll		= uio_poll,
 	.fasync		= uio_fasync,
+	.llseek		= noop_llseek,
 };
 
 static int uio_major_init(void)
 {
-	uio_major = register_chrdev(0, "uio", &uio_fops);
-	if (uio_major < 0)
-		return uio_major;
-	return 0;
+	static const char name[] = "uio";
+	struct cdev *cdev = NULL;
+	dev_t uio_dev = 0;
+	int result;
+
+	result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name);
+	if (result)
+		goto out;
+
+	result = -ENOMEM;
+	cdev = cdev_alloc();
+	if (!cdev)
+		goto out_unregister;
+
+	cdev->owner = THIS_MODULE;
+	cdev->ops = &uio_fops;
+	kobject_set_name(&cdev->kobj, "%s", name);
+
+	result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES);
+	if (result)
+		goto out_put;
+
+	uio_major = MAJOR(uio_dev);
+	uio_cdev = cdev;
+	result = 0;
+out:
+	return result;
+out_put:
+	kobject_put(&cdev->kobj);
+out_unregister:
+	unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES);
+	goto out;
 }
 
 static void uio_major_cleanup(void)
 {
-	unregister_chrdev(uio_major, "uio");
+	unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES);
+	cdev_del(uio_cdev);
 }
 
 static int init_uio_class(void)
 {
-	int ret = 0;
-
-	if (uio_class != NULL) {
-		kref_get(&uio_class->kref);
-		goto exit;
-	}
+	int ret;
 
 	/* This is the first time in here, set everything up properly */
 	ret = uio_major_init();
 	if (ret)
 		goto exit;
 
-	uio_class = kzalloc(sizeof(*uio_class), GFP_KERNEL);
-	if (!uio_class) {
-		ret = -ENOMEM;
-		goto err_kzalloc;
-	}
-
-	kref_init(&uio_class->kref);
-	uio_class->class = class_create(THIS_MODULE, "uio");
-	if (IS_ERR(uio_class->class)) {
-		ret = IS_ERR(uio_class->class);
-		printk(KERN_ERR "class_create failed for uio\n");
-		goto err_class_create;
+	ret = class_register(&uio_class);
+	if (ret) {
+		printk(KERN_ERR "class_register failed for uio\n");
+		goto err_class_register;
 	}
 	return 0;
 
-err_class_create:
-	kfree(uio_class);
-	uio_class = NULL;
-err_kzalloc:
+err_class_register:
 	uio_major_cleanup();
 exit:
 	return ret;
 }
 
-static void release_uio_class(struct kref *kref)
+static void release_uio_class(void)
 {
-	/* Ok, we cheat as we know we only have one uio_class */
-	class_destroy(uio_class->class);
-	kfree(uio_class);
+	class_unregister(&uio_class);
 	uio_major_cleanup();
-	uio_class = NULL;
-}
-
-static void uio_class_destroy(void)
-{
-	if (uio_class)
-		kref_put(&uio_class->kref, release_uio_class);
 }
 
 /**
@@ -828,10 +810,6 @@ int __uio_register_device(struct module *owner,
 
 	info->uio_dev = NULL;
 
-	ret = init_uio_class();
-	if (ret)
-		return ret;
-
 	idev = kzalloc(sizeof(*idev), GFP_KERNEL);
 	if (!idev) {
 		ret = -ENOMEM;
@@ -847,7 +825,7 @@ int __uio_register_device(struct module *owner,
 	if (ret)
 		goto err_get_minor;
 
-	idev->dev = device_create(uio_class->class, parent,
+	idev->dev = device_create(&uio_class, parent,
 				  MKDEV(uio_major, idev->minor), idev,
 				  "uio%d", idev->minor);
 	if (IS_ERR(idev->dev)) {
@@ -862,9 +840,9 @@ int __uio_register_device(struct module *owner,
 
 	info->uio_dev = idev;
 
-	if (idev->info->irq >= 0) {
-		ret = request_irq(idev->info->irq, uio_interrupt,
-				  idev->info->irq_flags, idev->info->name, idev);
+	if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) {
+		ret = request_irq(info->irq, uio_interrupt,
+				  info->irq_flags, info->name, idev);
 		if (ret)
 			goto err_request_irq;
 	}
@@ -874,13 +852,12 @@ int __uio_register_device(struct module *owner,
 err_request_irq:
 	uio_dev_del_attributes(idev);
 err_uio_dev_add_attributes:
-	device_destroy(uio_class->class, MKDEV(uio_major, idev->minor));
+	device_destroy(&uio_class, MKDEV(uio_major, idev->minor));
 err_device_create:
 	uio_free_minor(idev);
 err_get_minor:
 	kfree(idev);
 err_kzalloc:
-	uio_class_destroy();
 	return ret;
 }
 EXPORT_SYMBOL_GPL(__uio_register_device);
@@ -901,15 +878,13 @@ void uio_unregister_device(struct uio_info *info)
 
 	uio_free_minor(idev);
 
-	if (info->irq >= 0)
+	if (info->irq && (info->irq != UIO_IRQ_CUSTOM))
 		free_irq(info->irq, idev);
 
 	uio_dev_del_attributes(idev);
 
-	dev_set_drvdata(idev->dev, NULL);
-	device_destroy(uio_class->class, MKDEV(uio_major, idev->minor));
+	device_destroy(&uio_class, MKDEV(uio_major, idev->minor));
 	kfree(idev);
-	uio_class_destroy();
 
 	return;
 }
@@ -917,11 +892,12 @@ EXPORT_SYMBOL_GPL(uio_unregister_device);
 
 static int __init uio_init(void)
 {
-	return 0;
+	return init_uio_class();
 }
 
 static void __exit uio_exit(void)
 {
+	release_uio_class();
 }
 
 module_init(uio_init)