--- /dev/null
+/*
+ * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
+ * extra sysfs attribute from DRM. Normal drm_sysfs_class
+ * does not allow adding attributes.
+ *
+ * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
+ * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (c) 2003-2004 IBM Corp.
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/device.h>
+#include <linux/kdev_t.h>
+#include <linux/err.h>
+
+#include "drm_core.h"
+
+struct drm_sysfs_class {
+ struct class_device_attribute attr;
+ struct class class;
+};
+#define to_drm_sysfs_class(d) container_of(d, struct drm_sysfs_class, class)
+
+struct simple_dev {
+ struct list_head node;
+ dev_t dev;
+ struct class_device class_dev;
+};
+#define to_simple_dev(d) container_of(d, struct simple_dev, class_dev)
+
+static LIST_HEAD(simple_dev_list);
+static DEFINE_SPINLOCK(simple_dev_list_lock);
+
+static void release_simple_dev(struct class_device *class_dev)
+{
+ struct simple_dev *s_dev = to_simple_dev(class_dev);
+ kfree(s_dev);
+}
+
+static ssize_t show_dev(struct class_device *class_dev, char *buf)
+{
+ struct simple_dev *s_dev = to_simple_dev(class_dev);
+ return print_dev_t(buf, s_dev->dev);
+}
+
+static void drm_sysfs_class_release(struct class *class)
+{
+ struct drm_sysfs_class *cs = to_drm_sysfs_class(class);
+ kfree(cs);
+}
+
+/* Display the version of drm_core. This doesn't work right in current design */
+static ssize_t version_show(struct class *dev, char *buf)
+{
+ return sprintf(buf, "%s %d.%d.%d %s\n", DRIVER_NAME, DRIVER_MAJOR,
+ DRIVER_MINOR, DRIVER_PATCHLEVEL, DRIVER_DATE);
+}
+
+static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
+
+/**
+ * drm_sysfs_create - create a struct drm_sysfs_class structure
+ * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
+ * @name: pointer to a string for the name of this class.
+ *
+ * This is used to create a struct drm_sysfs_class pointer that can then be used
+ * in calls to drm_sysfs_device_add().
+ *
+ * Note, the pointer created here is to be destroyed when finished by making a
+ * call to drm_sysfs_destroy().
+ */
+struct drm_sysfs_class *drm_sysfs_create(struct module *owner, char *name)
+{
+ struct drm_sysfs_class *cs;
+ int retval;
+
+ cs = kmalloc(sizeof(*cs), GFP_KERNEL);
+ if (!cs) {
+ retval = -ENOMEM;
+ goto error;
+ }
+ memset(cs, 0x00, sizeof(*cs));
+
+ cs->class.name = name;
+ cs->class.class_release = drm_sysfs_class_release;
+ cs->class.release = release_simple_dev;
+
+ cs->attr.attr.name = "dev";
+ cs->attr.attr.mode = S_IRUGO;
+ cs->attr.attr.owner = owner;
+ cs->attr.show = show_dev;
+ cs->attr.store = NULL;
+
+ retval = class_register(&cs->class);
+ if (retval)
+ goto error;
+ class_create_file(&cs->class, &class_attr_version);
+
+ return cs;
+
+ error:
+ kfree(cs);
+ return ERR_PTR(retval);
+}
+
+/**
+ * drm_sysfs_destroy - destroys a struct drm_sysfs_class structure
+ * @cs: pointer to the struct drm_sysfs_class that is to be destroyed
+ *
+ * Note, the pointer to be destroyed must have been created with a call to
+ * drm_sysfs_create().
+ */
+void drm_sysfs_destroy(struct drm_sysfs_class *cs)
+{
+ if ((cs == NULL) || (IS_ERR(cs)))
+ return;
+
+ class_unregister(&cs->class);
+}
+
+/**
+ * drm_sysfs_device_add - adds a class device to sysfs for a character driver
+ * @cs: pointer to the struct drm_sysfs_class that this device should be registered to.
+ * @dev: the dev_t for the device to be added.
+ * @device: a pointer to a struct device that is assiociated with this class device.
+ * @fmt: string for the class device's name
+ *
+ * A struct class_device will be created in sysfs, registered to the specified
+ * class. A "dev" file will be created, showing the dev_t for the device. The
+ * pointer to the struct class_device will be returned from the call. Any further
+ * sysfs files that might be required can be created using this pointer.
+ * Note: the struct drm_sysfs_class passed to this function must have previously been
+ * created with a call to drm_sysfs_create().
+ */
+struct class_device *drm_sysfs_device_add(struct drm_sysfs_class *cs, dev_t dev,
+ struct device *device,
+ const char *fmt, ...)
+{
+ va_list args;
+ struct simple_dev *s_dev = NULL;
+ int retval;
+
+ if ((cs == NULL) || (IS_ERR(cs))) {
+ retval = -ENODEV;
+ goto error;
+ }
+
+ s_dev = kmalloc(sizeof(*s_dev), GFP_KERNEL);
+ if (!s_dev) {
+ retval = -ENOMEM;
+ goto error;
+ }
+ memset(s_dev, 0x00, sizeof(*s_dev));
+
+ s_dev->dev = dev;
+ s_dev->class_dev.dev = device;
+ s_dev->class_dev.class = &cs->class;
+
+ va_start(args, fmt);
+ vsnprintf(s_dev->class_dev.class_id, BUS_ID_SIZE, fmt, args);
+ va_end(args);
+ retval = class_device_register(&s_dev->class_dev);
+ if (retval)
+ goto error;
+
+ class_device_create_file(&s_dev->class_dev, &cs->attr);
+
+ spin_lock(&simple_dev_list_lock);
+ list_add(&s_dev->node, &simple_dev_list);
+ spin_unlock(&simple_dev_list_lock);
+
+ return &s_dev->class_dev;
+
+ error:
+ kfree(s_dev);
+ return ERR_PTR(retval);
+}
+
+/**
+ * drm_sysfs_device_remove - removes a class device that was created with drm_sysfs_device_add()
+ * @dev: the dev_t of the device that was previously registered.
+ *
+ * This call unregisters and cleans up a class device that was created with a
+ * call to drm_sysfs_device_add()
+ */
+void drm_sysfs_device_remove(dev_t dev)
+{
+ struct simple_dev *s_dev = NULL;
+ int found = 0;
+
+ spin_lock(&simple_dev_list_lock);
+ list_for_each_entry(s_dev, &simple_dev_list, node) {
+ if (s_dev->dev == dev) {
+ found = 1;
+ break;
+ }
+ }
+ if (found) {
+ list_del(&s_dev->node);
+ spin_unlock(&simple_dev_list_lock);
+ class_device_unregister(&s_dev->class_dev);
+ } else {
+ spin_unlock(&simple_dev_list_lock);
+ }
+}
git://git.onelab.eu / linux-2.6.git / blobdiff