1 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
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/config.h>
16 #include <linux/device.h>
17 #include <linux/kdev_t.h>
18 #include <linux/err.h>
20 struct drm_sysfs_class {
21 struct class_device_attribute attr;
24 #define to_drm_sysfs_class(d) container_of(d, struct drm_sysfs_class, class)
27 struct list_head node;
29 struct class_device class_dev;
31 #define to_simple_dev(d) container_of(d, struct simple_dev, class_dev)
33 static LIST_HEAD(simple_dev_list);
34 static spinlock_t simple_dev_list_lock = SPIN_LOCK_UNLOCKED;
36 static void release_simple_dev(struct class_device *class_dev)
38 struct simple_dev *s_dev = to_simple_dev(class_dev);
42 static ssize_t show_dev(struct class_device *class_dev, char *buf)
44 struct simple_dev *s_dev = to_simple_dev(class_dev);
45 return print_dev_t(buf, s_dev->dev);
48 static void drm_sysfs_class_release(struct class *class)
50 struct drm_sysfs_class *cs = to_drm_sysfs_class(class);
54 /* Display the version of drm_core. This doesn't work right in current design */
55 static ssize_t version_show(struct class *dev, char *buf)
57 return sprintf(buf, "fixme for drm_core %s %d.%d.%d %s\n", DRIVER_NAME, DRIVER_MAJOR,
58 DRIVER_MINOR, DRIVER_PATCHLEVEL, DRIVER_DATE);
60 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
63 * DRM(sysfs_create) - create a struct drm_sysfs_class structure
64 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
65 * @name: pointer to a string for the name of this class.
67 * This is used to create a struct drm_sysfs_class pointer that can then be used
68 * in calls to DRM(sysfs_device_add)().
70 * Note, the pointer created here is to be destroyed when finished by making a
71 * call to DRM(sysfs_destroy)().
73 struct drm_sysfs_class *DRM(sysfs_create)(struct module *owner, char *name)
75 struct drm_sysfs_class *cs;
78 cs = kmalloc(sizeof(*cs), GFP_KERNEL);
83 memset(cs, 0x00, sizeof(*cs));
85 cs->class.name = name;
86 cs->class.class_release = drm_sysfs_class_release;
87 cs->class.release = release_simple_dev;
89 cs->attr.attr.name = "dev";
90 cs->attr.attr.mode = S_IRUGO;
91 cs->attr.attr.owner = owner;
92 cs->attr.show = show_dev;
93 cs->attr.store = NULL;
95 retval = class_register(&cs->class);
98 class_create_file(&cs->class, &class_attr_version);
104 return ERR_PTR(retval);
108 * DRM(sysfs_destroy) - destroys a struct drm_sysfs_class structure
109 * @cs: pointer to the struct drm_sysfs_class that is to be destroyed
111 * Note, the pointer to be destroyed must have been created with a call to
112 * DRM(sysfs_create)().
114 void DRM(sysfs_destroy)(struct drm_sysfs_class *cs)
116 if ((cs == NULL) || (IS_ERR(cs)))
119 class_unregister(&cs->class);
123 * DRM(sysfs_device_add) - adds a class device to sysfs for a character driver
124 * @cs: pointer to the struct drm_sysfs_class that this device should be registered to.
125 * @dev: the dev_t for the device to be added.
126 * @device: a pointer to a struct device that is assiociated with this class device.
127 * @fmt: string for the class device's name
129 * A struct class_device will be created in sysfs, registered to the specified
130 * class. A "dev" file will be created, showing the dev_t for the device. The
131 * pointer to the struct class_device will be returned from the call. Any further
132 * sysfs files that might be required can be created using this pointer.
133 * Note: the struct drm_sysfs_class passed to this function must have previously been
134 * created with a call to DRM(sysfs_create)().
136 struct class_device *DRM(sysfs_device_add)(struct drm_sysfs_class *cs, dev_t dev, struct device *device, const char *fmt, ...)
139 struct simple_dev *s_dev = NULL;
142 if ((cs == NULL) || (IS_ERR(cs))) {
147 s_dev = kmalloc(sizeof(*s_dev), GFP_KERNEL);
152 memset(s_dev, 0x00, sizeof(*s_dev));
155 s_dev->class_dev.dev = device;
156 s_dev->class_dev.class = &cs->class;
159 vsnprintf(s_dev->class_dev.class_id, BUS_ID_SIZE, fmt, args);
161 retval = class_device_register(&s_dev->class_dev);
165 class_device_create_file(&s_dev->class_dev, &cs->attr);
167 spin_lock(&simple_dev_list_lock);
168 list_add(&s_dev->node, &simple_dev_list);
169 spin_unlock(&simple_dev_list_lock);
171 return &s_dev->class_dev;
175 return ERR_PTR(retval);
179 * DRM(sysfs_device_remove) - removes a class device that was created with DRM(sysfs_device_add)()
180 * @dev: the dev_t of the device that was previously registered.
182 * This call unregisters and cleans up a class device that was created with a
183 * call to DRM(sysfs_device_add)()
185 void DRM(sysfs_device_remove)(dev_t dev)
187 struct simple_dev *s_dev = NULL;
190 spin_lock(&simple_dev_list_lock);
191 list_for_each_entry(s_dev, &simple_dev_list, node) {
192 if (s_dev->dev == dev) {
198 list_del(&s_dev->node);
199 spin_unlock(&simple_dev_list_lock);
200 class_device_unregister(&s_dev->class_dev);
202 spin_unlock(&simple_dev_list_lock);