1 2/* 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. 6 * 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. 10 * 11 * This file is released under the GPLv2 12 * 13 */ 14 15#include <linux/device.h> 16#include <linux/kdev_t.h> 17#include <linux/err.h> 18 19#include "drm_core.h" 20#include "drmP.h" 21 22/* Display the version of drm_core. This doesn't work right in current design */ 23static ssize_t version_show(struct class *dev, char *buf) 24{ 25 return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR, 26 CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 27} 28 29static CLASS_ATTR(version, S_IRUGO, version_show, NULL); 30 31/** 32 * drm_sysfs_create - create a struct drm_sysfs_class structure 33 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class 34 * @name: pointer to a string for the name of this class. 35 * 36 * This is used to create a struct drm_sysfs_class pointer that can then be used 37 * in calls to drm_sysfs_device_add(). 38 * 39 * Note, the pointer created here is to be destroyed when finished by making a 40 * call to drm_sysfs_destroy(). 41 */ 42struct class *drm_sysfs_create(struct module *owner, char *name) 43{ 44 struct class *class; 45 int err; 46 47 class = class_create(owner, name); 48 if (IS_ERR(class)) { 49 err = PTR_ERR(class); 50 goto err_out; 51 } 52 53 err = class_create_file(class, &class_attr_version); 54 if (err) 55 goto err_out_class; 56 57 return class; 58 59err_out_class: 60 class_destroy(class); 61err_out: 62 return ERR_PTR(err); 63} 64 65/** 66 * drm_sysfs_destroy - destroys a struct drm_sysfs_class structure 67 * @cs: pointer to the struct drm_sysfs_class that is to be destroyed 68 * 69 * Note, the pointer to be destroyed must have been created with a call to 70 * drm_sysfs_create(). 71 */ 72void drm_sysfs_destroy(struct class *class) 73{ 74 if ((class == NULL) || (IS_ERR(class))) 75 return; 76 77 class_remove_file(class, &class_attr_version); 78 class_destroy(class); 79} 80 81static ssize_t show_dri(struct class_device *class_device, char *buf) 82{ 83 drm_device_t * dev = ((drm_head_t *)class_get_devdata(class_device))->dev; 84 if (dev->driver->dri_library_name) 85 return dev->driver->dri_library_name(dev, buf); 86 return snprintf(buf, PAGE_SIZE, "%s\n", dev->driver->pci_driver.name); 87} 88 89static struct class_device_attribute class_device_attrs[] = { 90 __ATTR(dri_library_name, S_IRUGO, show_dri, NULL), 91}; 92 93/** 94 * drm_sysfs_device_add - adds a class device to sysfs for a character driver 95 * @cs: pointer to the struct class that this device should be registered to. 96 * @dev: the dev_t for the device to be added. 97 * @device: a pointer to a struct device that is assiociated with this class device. 98 * @fmt: string for the class device's name 99 * 100 * A struct class_device will be created in sysfs, registered to the specified 101 * class. A "dev" file will be created, showing the dev_t for the device. The 102 * pointer to the struct class_device will be returned from the call. Any further 103 * sysfs files that might be required can be created using this pointer. 104 * Note: the struct class passed to this function must have previously been 105 * created with a call to drm_sysfs_create(). 106 */ 107struct class_device *drm_sysfs_device_add(struct class *cs, drm_head_t *head) 108{ 109 struct class_device *class_dev; 110 int i, j, err; 111 112 class_dev = class_device_create(cs, NULL, 113 MKDEV(DRM_MAJOR, head->minor), 114 &(head->dev->pdev)->dev, 115 "card%d", head->minor); 116 if (IS_ERR(class_dev)) { 117 err = PTR_ERR(class_dev); 118 goto err_out; 119 } 120 121 class_set_devdata(class_dev, head); 122 123 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) { 124 err = class_device_create_file(class_dev, 125 &class_device_attrs[i]); 126 if (err) 127 goto err_out_files; 128 } 129 130 return class_dev; 131 132err_out_files: 133 if (i > 0) 134 for (j = 0; j < i; j++) 135 class_device_remove_file(class_dev, 136 &class_device_attrs[i]); 137 class_device_unregister(class_dev); 138err_out: 139 return ERR_PTR(err); 140} 141 142/** 143 * drm_sysfs_device_remove - removes a class device that was created with drm_sysfs_device_add() 144 * @dev: the dev_t of the device that was previously registered. 145 * 146 * This call unregisters and cleans up a class device that was created with a 147 * call to drm_sysfs_device_add() 148 */ 149void drm_sysfs_device_remove(struct class_device *class_dev) 150{ 151 int i; 152 153 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) 154 class_device_remove_file(class_dev, &class_device_attrs[i]); 155 class_device_unregister(class_dev); 156} 157