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_device(d) container_of(d, struct drm_device, dev)
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_device *drm_dev = to_drm_device(dev);
36 printk(KERN_ERR "%s\n", __FUNCTION__);
38 if (drm_dev->driver->suspend)
39 return drm_dev->driver->suspend(drm_dev, state);
45 * drm_sysfs_resume - DRM class resume hook
46 * @dev: Linux device to resume
48 * Just figures out what the actual struct drm_device associated with
49 * @dev is and calls its resume hook, if present.
51 static int drm_sysfs_resume(struct device *dev)
53 struct drm_device *drm_dev = to_drm_device(dev);
55 if (drm_dev->driver->resume)
56 return drm_dev->driver->resume(drm_dev);
61 /* Display the version of drm_core. This doesn't work right in current design */
62 static ssize_t version_show(struct class *dev, char *buf)
64 return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
65 CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
68 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
71 * drm_sysfs_create - create a struct drm_sysfs_class structure
72 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
73 * @name: pointer to a string for the name of this class.
75 * This is used to create DRM class pointer that can then be used
76 * in calls to drm_sysfs_device_add().
78 * Note, the pointer created here is to be destroyed when finished by making a
79 * call to drm_sysfs_destroy().
81 struct class *drm_sysfs_create(struct module *owner, char *name)
86 class = class_create(owner, name);
92 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22))
93 class->suspend = drm_sysfs_suspend;
94 class->resume = drm_sysfs_resume;
97 err = class_create_file(class, &class_attr_version);
104 class_destroy(class);
110 * drm_sysfs_destroy - destroys DRM class
112 * Destroy the DRM device class.
114 void drm_sysfs_destroy(void)
116 if ((drm_class == NULL) || (IS_ERR(drm_class)))
118 class_remove_file(drm_class, &class_attr_version);
119 class_destroy(drm_class);
122 static ssize_t show_dri(struct device *device, struct device_attribute *attr,
125 struct drm_device *dev = to_drm_device(device);
126 if (dev->driver->dri_library_name)
127 return dev->driver->dri_library_name(dev, buf);
128 return snprintf(buf, PAGE_SIZE, "%s\n", dev->driver->pci_driver.name);
131 static struct device_attribute device_attrs[] = {
132 __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
136 * drm_sysfs_device_release - do nothing
139 * Normally, this would free the DRM device associated with @dev, along
140 * with cleaning up any other stuff. But we do that in the DRM core, so
141 * this function can just return and hope that the core does its job.
143 static void drm_sysfs_device_release(struct device *dev)
149 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
150 * @dev: DRM device to be added
151 * @head: DRM head in question
153 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
154 * as the parent for the Linux device, and make sure it has a file containing
155 * the driver we're using (for userspace compatibility).
157 int drm_sysfs_device_add(struct drm_device *dev, struct drm_head *head)
162 dev->dev.parent = &dev->pdev->dev;
163 dev->dev.class = drm_class;
164 dev->dev.release = drm_sysfs_device_release;
165 dev->dev.devt = head->device;
166 snprintf(dev->dev.bus_id, BUS_ID_SIZE, "card%d", head->minor);
168 err = device_register(&dev->dev);
170 DRM_ERROR("device add failed: %d\n", err);
174 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
175 err = device_create_file(&dev->dev, &device_attrs[i]);
184 for (j = 0; j < i; j++)
185 device_remove_file(&dev->dev, &device_attrs[i]);
186 device_unregister(&dev->dev);
193 * drm_sysfs_device_remove - remove DRM device
194 * @dev: DRM device to remove
196 * This call unregisters and cleans up a class device that was created with a
197 * call to drm_sysfs_device_add()
199 void drm_sysfs_device_remove(struct drm_device *dev)
203 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
204 device_remove_file(&dev->dev, &device_attrs[i]);
205 device_unregister(&dev->dev);