3 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
4 * extra sysfs attribute from DRM. Normal drm_sysfs_class
5 * does not allow adding attributes.
7 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
8 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
9 * Copyright (c) 2003-2004 IBM Corp.
11 * This file is released under the GPLv2
15 #include <linux/device.h>
16 #include <linux/kdev_t.h>
17 #include <linux/err.h>
22 #define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
25 * drm_sysfs_suspend - DRM class suspend hook
26 * @dev: Linux device to suspend
27 * @state: power state to enter
29 * Just figures out what the actual struct drm_device associated with
30 * @dev is and calls its suspend hook, if present.
32 static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
34 struct drm_minor *drm_minor = to_drm_minor(dev);
35 struct drm_device *drm_dev = drm_minor->dev;
37 printk(KERN_ERR "%s\n", __FUNCTION__);
39 if (drm_dev->driver->suspend)
40 return drm_dev->driver->suspend(drm_dev, state);
46 * drm_sysfs_resume - DRM class resume hook
47 * @dev: Linux device to resume
49 * Just figures out what the actual struct drm_device associated with
50 * @dev is and calls its resume hook, if present.
52 static int drm_sysfs_resume(struct device *dev)
54 struct drm_minor *drm_minor = to_drm_minor(dev);
55 struct drm_device *drm_dev = drm_minor->dev;
57 if (drm_dev->driver->resume)
58 return drm_dev->driver->resume(drm_dev);
63 /* Display the version of drm_core. This doesn't work right in current design */
64 static ssize_t version_show(struct class *dev, char *buf)
66 return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
67 CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
70 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
73 * drm_sysfs_create - create a struct drm_sysfs_class structure
74 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
75 * @name: pointer to a string for the name of this class.
77 * This is used to create DRM class pointer that can then be used
78 * in calls to drm_sysfs_device_add().
80 * Note, the pointer created here is to be destroyed when finished by making a
81 * call to drm_sysfs_destroy().
83 struct class *drm_sysfs_create(struct module *owner, char *name)
88 class = class_create(owner, name);
94 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22))
95 class->suspend = drm_sysfs_suspend;
96 class->resume = drm_sysfs_resume;
99 err = class_create_file(class, &class_attr_version);
106 class_destroy(class);
112 * drm_sysfs_destroy - destroys DRM class
114 * Destroy the DRM device class.
116 void drm_sysfs_destroy(void)
118 if ((drm_class == NULL) || (IS_ERR(drm_class)))
120 class_remove_file(drm_class, &class_attr_version);
121 class_destroy(drm_class);
124 static ssize_t show_dri(struct device *device, struct device_attribute *attr,
127 struct drm_minor *drm_minor = to_drm_minor(device);
128 struct drm_device *drm_dev = drm_minor->dev;
129 if (drm_dev->driver->dri_library_name)
130 return drm_dev->driver->dri_library_name(drm_dev, buf);
131 return snprintf(buf, PAGE_SIZE, "%s\n", drm_dev->driver->pci_driver.name);
134 static struct device_attribute device_attrs[] = {
135 __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
139 * drm_sysfs_device_release - do nothing
142 * Normally, this would free the DRM device associated with @dev, along
143 * with cleaning up any other stuff. But we do that in the DRM core, so
144 * this function can just return and hope that the core does its job.
146 static void drm_sysfs_device_release(struct device *dev)
152 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
153 * @dev: DRM device to be added
154 * @head: DRM head in question
156 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
157 * as the parent for the Linux device, and make sure it has a file containing
158 * the driver we're using (for userspace compatibility).
160 int drm_sysfs_device_add(struct drm_minor *minor)
166 minor->kdev.parent = &minor->dev->pdev->dev;
167 minor->kdev.class = drm_class;
168 minor->kdev.release = drm_sysfs_device_release;
169 minor->kdev.devt = minor->device;
170 minor_str = "card%d";
172 err = dev_set_name(&minor->kdev, minor_str, minor->index);
174 DRM_ERROR("device set name failed: %d\n", err);
178 err = device_register(&minor->kdev);
180 DRM_ERROR("device add failed: %d\n", err);
184 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
185 err = device_create_file(&minor->kdev, &device_attrs[i]);
194 for (j = 0; j < i; j++)
195 device_remove_file(&minor->kdev, &device_attrs[j]);
196 device_unregister(&minor->kdev);
203 * drm_sysfs_device_remove - remove DRM device
204 * @dev: DRM device to remove
206 * This call unregisters and cleans up a class device that was created with a
207 * call to drm_sysfs_device_add()
209 void drm_sysfs_device_remove(struct drm_minor *minor)
213 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
214 device_remove_file(&minor->kdev, &device_attrs[i]);
215 device_unregister(&minor->kdev);