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);
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 class->suspend = drm_sysfs_suspend;
93 class->resume = drm_sysfs_resume;
95 err = class_create_file(class, &class_attr_version);
102 class_destroy(class);
108 * drm_sysfs_destroy - destroys DRM class
110 * Destroy the DRM device class.
112 void drm_sysfs_destroy(void)
114 if ((drm_class == NULL) || (IS_ERR(drm_class)))
116 class_remove_file(drm_class, &class_attr_version);
117 class_destroy(drm_class);
120 static ssize_t show_dri(struct device *device, struct device_attribute *attr,
123 struct drm_device *dev = to_drm_device(device);
124 if (dev->driver->dri_library_name)
125 return dev->driver->dri_library_name(dev, buf);
126 return snprintf(buf, PAGE_SIZE, "%s\n", dev->driver->pci_driver.name);
129 static struct device_attribute device_attrs[] = {
130 __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
134 * drm_sysfs_device_release - do nothing
137 * Normally, this would free the DRM device associated with @dev, along
138 * with cleaning up any other stuff. But we do that in the DRM core, so
139 * this function can just return and hope that the core does its job.
141 static void drm_sysfs_device_release(struct device *dev)
147 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
148 * @dev: DRM device to be added
149 * @head: DRM head in question
151 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
152 * as the parent for the Linux device, and make sure it has a file containing
153 * the driver we're using (for userspace compatibility).
155 int drm_sysfs_device_add(struct drm_device *dev, struct drm_head *head)
160 dev->dev.parent = &dev->pdev->dev;
161 dev->dev.class = drm_class;
162 dev->dev.release = drm_sysfs_device_release;
163 dev->dev.devt = head->device;
164 snprintf(dev->dev.bus_id, BUS_ID_SIZE, "card%d", head->minor);
166 err = device_register(&dev->dev);
168 DRM_ERROR("device add failed: %d\n", err);
172 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
173 err = device_create_file(&dev->dev, &device_attrs[i]);
182 for (j = 0; j < i; j++)
183 device_remove_file(&dev->dev, &device_attrs[i]);
184 device_unregister(&dev->dev);
191 * drm_sysfs_device_remove - remove DRM device
192 * @dev: DRM device to remove
194 * This call unregisters and cleans up a class device that was created with a
195 * call to drm_sysfs_device_add()
197 void drm_sysfs_device_remove(struct drm_device *dev)
201 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
202 device_remove_file(&dev->dev, &device_attrs[i]);
203 device_unregister(&dev->dev);