1 files changed, 208 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
new file mode 100644
index 000000000000..af211a0ef179
--- /dev/null
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -0,0 +1,208 @@
+
+/*
+ * 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/device.h>
+#include <linux/kdev_t.h>
+#include <linux/err.h>
+
+#include "drm_core.h"
+#include "drmP.h"
+
+#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
+
+/**
+ * drm_sysfs_suspend - DRM class suspend hook
+ * @dev: Linux device to suspend
+ * @state: power state to enter
+ *
+ * Just figures out what the actual struct drm_device associated with
+ * @dev is and calls its suspend hook, if present.
+ */
+static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
+{
+        struct drm_minor *drm_minor = to_drm_minor(dev);
+        struct drm_device *drm_dev = drm_minor->dev;
+
+        if (drm_dev->driver->suspend)
+                return drm_dev->driver->suspend(drm_dev, state);
+
+        return 0;
+}
+
+/**
+ * drm_sysfs_resume - DRM class resume hook
+ * @dev: Linux device to resume
+ *
+ * Just figures out what the actual struct drm_device associated with
+ * @dev is and calls its resume hook, if present.
+ */
+static int drm_sysfs_resume(struct device *dev)
+{
+        struct drm_minor *drm_minor = to_drm_minor(dev);
+        struct drm_device *drm_dev = drm_minor->dev;
+
+        if (drm_dev->driver->resume)
+                return drm_dev->driver->resume(drm_dev);
+
+        return 0;
+}
+
+/* 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", CORE_NAME, CORE_MAJOR,
+                       CORE_MINOR, CORE_PATCHLEVEL, CORE_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 DRM 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 class *drm_sysfs_create(struct module *owner, char *name)
+{
+        struct class *class;
+        int err;
+
+        class = class_create(owner, name);
+        if (IS_ERR(class)) {
+                err = PTR_ERR(class);
+                goto err_out;
+        }
+
+        class->suspend = drm_sysfs_suspend;
+        class->resume = drm_sysfs_resume;
+
+        err = class_create_file(class, &class_attr_version);
+        if (err)
+                goto err_out_class;
+
+        return class;
+
+err_out_class:
+        class_destroy(class);
+err_out:
+        return ERR_PTR(err);
+}
+
+/**
+ * drm_sysfs_destroy - destroys DRM class
+ *
+ * Destroy the DRM device class.
+ */
+void drm_sysfs_destroy(void)
+{
+        if ((drm_class == NULL) || (IS_ERR(drm_class)))
+                return;
+        class_remove_file(drm_class, &class_attr_version);
+        class_destroy(drm_class);
+}
+
+static ssize_t show_dri(struct device *device, struct device_attribute *attr,
+                        char *buf)
+{
+        struct drm_minor *drm_minor = to_drm_minor(device);
+        struct drm_device *drm_dev = drm_minor->dev;
+        if (drm_dev->driver->dri_library_name)
+                return drm_dev->driver->dri_library_name(drm_dev, buf);
+        return snprintf(buf, PAGE_SIZE, "%s\n", drm_dev->driver->pci_driver.name);
+}
+
+static struct device_attribute device_attrs[] = {
+        __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
+};
+
+/**
+ * drm_sysfs_device_release - do nothing
+ * @dev: Linux device
+ *
+ * Normally, this would free the DRM device associated with @dev, along
+ * with cleaning up any other stuff.  But we do that in the DRM core, so
+ * this function can just return and hope that the core does its job.
+ */
+static void drm_sysfs_device_release(struct device *dev)
+{
+        return;
+}
+
+/**
+ * drm_sysfs_device_add - adds a class device to sysfs for a character driver
+ * @dev: DRM device to be added
+ * @head: DRM head in question
+ *
+ * Add a DRM device to the DRM's device model class.  We use @dev's PCI device
+ * as the parent for the Linux device, and make sure it has a file containing
+ * the driver we're using (for userspace compatibility).
+ */
+int drm_sysfs_device_add(struct drm_minor *minor)
+{
+        int err;
+        int i, j;
+        char *minor_str;
+
+        minor->kdev.parent = &minor->dev->pdev->dev;
+        minor->kdev.class = drm_class;
+        minor->kdev.release = drm_sysfs_device_release;
+        minor->kdev.devt = minor->device;
+        minor_str = "card%d";
+
+        snprintf(minor->kdev.bus_id, BUS_ID_SIZE, minor_str, minor->index);
+
+        err = device_register(&minor->kdev);
+        if (err) {
+                DRM_ERROR("device add failed: %d\n", err);
+                goto err_out;
+        }
+
+        for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
+                err = device_create_file(&minor->kdev, &device_attrs[i]);
+                if (err)
+                        goto err_out_files;
+        }
+
+        return 0;
+
+err_out_files:
+        if (i > 0)
+                for (j = 0; j < i; j++)
+                        device_remove_file(&minor->kdev, &device_attrs[i]);
+        device_unregister(&minor->kdev);
+err_out:
+
+        return err;
+}
+
+/**
+ * drm_sysfs_device_remove - remove DRM device
+ * @dev: DRM device to remove
+ *
+ * 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(struct drm_minor *minor)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
+                device_remove_file(&minor->kdev, &device_attrs[i]);
+        device_unregister(&minor->kdev);
+}