*/
#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/idr.h>
#include <linux/usb.h>
#include "usb.h"
-/* endpoint stuff */
+#define MAX_ENDPOINT_MINORS (64*128*32)
+static int usb_endpoint_major;
+static DEFINE_IDR(endpoint_idr);
struct ep_device {
struct usb_endpoint_descriptor *desc;
struct usb_device *udev;
struct device dev;
+ int minor;
};
#define to_ep_device(_dev) \
container_of(_dev, struct ep_device, dev)
.attrs = ep_dev_attrs,
};
+static int usb_endpoint_major_init(void)
+{
+ dev_t dev;
+ int error;
+
+ error = alloc_chrdev_region(&dev, 0, MAX_ENDPOINT_MINORS,
+ "usb_endpoint");
+ if (error) {
+ err("unable to get a dynamic major for usb endpoints");
+ return error;
+ }
+ usb_endpoint_major = MAJOR(dev);
+
+ return error;
+}
+
+static void usb_endpoint_major_cleanup(void)
+{
+ unregister_chrdev_region(MKDEV(usb_endpoint_major, 0),
+ MAX_ENDPOINT_MINORS);
+}
+
+static int endpoint_get_minor(struct ep_device *ep_dev)
+{
+ static DEFINE_MUTEX(minor_lock);
+ int retval = -ENOMEM;
+ int id;
+
+ mutex_lock(&minor_lock);
+ if (idr_pre_get(&endpoint_idr, GFP_KERNEL) == 0)
+ goto exit;
+
+ retval = idr_get_new(&endpoint_idr, ep_dev, &id);
+ if (retval < 0) {
+ if (retval == -EAGAIN)
+ retval = -ENOMEM;
+ goto exit;
+ }
+ ep_dev->minor = id & MAX_ID_MASK;
+exit:
+ mutex_unlock(&minor_lock);
+ return retval;
+}
+
+static void endpoint_free_minor(struct ep_device *ep_dev)
+{
+ idr_remove(&endpoint_idr, ep_dev->minor);
+}
+
static struct endpoint_class {
struct kref kref;
struct class *class;
ep_class->class = class_create(THIS_MODULE, "usb_endpoint");
if (IS_ERR(ep_class->class)) {
result = IS_ERR(ep_class->class);
- kfree(ep_class);
- ep_class = NULL;
- goto exit;
+ goto class_create_error;
}
+ result = usb_endpoint_major_init();
+ if (result)
+ goto endpoint_major_error;
+
+ goto exit;
+
+endpoint_major_error:
+ class_destroy(ep_class->class);
+class_create_error:
+ kfree(ep_class);
+ ep_class = NULL;
exit:
return result;
}
class_destroy(ep_class->class);
kfree(ep_class);
ep_class = NULL;
+ usb_endpoint_major_cleanup();
}
static void destroy_endpoint_class(void)
struct ep_device *ep_dev = to_ep_device(dev);
dev_dbg(dev, "%s called for %s\n", __FUNCTION__, dev->bus_id);
+ endpoint_free_minor(ep_dev);
kfree(ep_dev);
}
-void usb_create_ep_files(struct device *parent,
- struct usb_host_endpoint *endpoint,
- struct usb_device *udev)
+int usb_create_ep_files(struct device *parent,
+ struct usb_host_endpoint *endpoint,
+ struct usb_device *udev)
{
char name[8];
struct ep_device *ep_dev;
- int minor;
int retval;
retval = init_endpoint_class();
ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
if (!ep_dev) {
retval = -ENOMEM;
- goto exit;
+ goto error_alloc;
}
- /* fun calculation to determine the minor of this endpoint */
- minor = (((udev->bus->busnum - 1) * 128) * 16) + (udev->devnum - 1);
+ retval = endpoint_get_minor(ep_dev);
+ if (retval) {
+ dev_err(parent, "can not allocate minor number for %s",
+ ep_dev->dev.bus_id);
+ goto error_register;
+ }
ep_dev->desc = &endpoint->desc;
ep_dev->udev = udev;
- ep_dev->dev.devt = MKDEV(442, minor); // FIXME fake number...
+ ep_dev->dev.devt = MKDEV(usb_endpoint_major, ep_dev->minor);
ep_dev->dev.class = ep_class->class;
ep_dev->dev.parent = parent;
ep_dev->dev.release = ep_device_release;
retval = device_register(&ep_dev->dev);
if (retval)
- goto error;
- sysfs_create_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
-
- endpoint->ep_dev = ep_dev;
+ goto error_chrdev;
+ retval = sysfs_create_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
+ if (retval)
+ goto error_group;
/* create the symlink to the old-style "ep_XX" directory */
sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
- sysfs_create_link(&parent->kobj, &endpoint->ep_dev->dev.kobj, name);
+ retval = sysfs_create_link(&parent->kobj, &ep_dev->dev.kobj, name);
+ if (retval)
+ goto error_link;
+ endpoint->ep_dev = ep_dev;
+ return retval;
-exit:
- return;
-error:
+error_link:
+ sysfs_remove_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
+error_group:
+ device_unregister(&ep_dev->dev);
+ destroy_endpoint_class();
+ return retval;
+
+error_chrdev:
+ endpoint_free_minor(ep_dev);
+
+error_register:
kfree(ep_dev);
- return;
+error_alloc:
+ destroy_endpoint_class();
+exit:
+ return retval;
}
void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
{
+ struct ep_device *ep_dev = endpoint->ep_dev;
- if (endpoint->ep_dev) {
+ if (ep_dev) {
char name[8];
sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
- sysfs_remove_link(&endpoint->ep_dev->dev.parent->kobj, name);
- sysfs_remove_group(&endpoint->ep_dev->dev.kobj, &ep_dev_attr_grp);
- device_unregister(&endpoint->ep_dev->dev);
+ sysfs_remove_link(&ep_dev->dev.parent->kobj, name);
+ sysfs_remove_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
+ device_unregister(&ep_dev->dev);
endpoint->ep_dev = NULL;
+ destroy_endpoint_class();
}
- destroy_endpoint_class();
}
-
-
git.openpandora.org / pandora-kernel.git / blobdiff