156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
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/*
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* drm_sysfs.c - Modifications to drm_sysfs_class.c to support
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* extra sysfs attribute from DRM. Normal drm_sysfs_class
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* does not allow adding attributes.
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*
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* Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
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* Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (c) 2003-2004 IBM Corp.
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*
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* This file is released under the GPLv2
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*
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*/
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#include <linux/device.h>
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#include <linux/kdev_t.h>
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#include <linux/err.h>
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#include "drm_core.h"
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#include "drmP.h"
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/* Display the version of drm_core. This doesn't work right in current design */
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static ssize_t version_show(struct class *dev, char *buf)
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{
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return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
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CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
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}
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static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
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/**
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* drm_sysfs_create - create a struct drm_sysfs_class structure
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* @owner: pointer to the module that is to "own" this struct drm_sysfs_class
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* @name: pointer to a string for the name of this class.
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*
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* This is used to create a struct drm_sysfs_class pointer that can then be used
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* in calls to drm_sysfs_device_add().
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*
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* Note, the pointer created here is to be destroyed when finished by making a
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* call to drm_sysfs_destroy().
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*/
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struct class *drm_sysfs_create(struct module *owner, char *name)
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{
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struct class *class;
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int err;
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class = class_create(owner, name);
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if (IS_ERR(class)) {
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err = PTR_ERR(class);
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goto err_out;
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}
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err = class_create_file(class, &class_attr_version);
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if (err)
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goto err_out_class;
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return class;
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err_out_class:
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class_destroy(class);
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err_out:
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return ERR_PTR(err);
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}
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/**
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* drm_sysfs_destroy - destroys a struct drm_sysfs_class structure
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* @cs: pointer to the struct drm_sysfs_class that is to be destroyed
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*
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* Note, the pointer to be destroyed must have been created with a call to
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* drm_sysfs_create().
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*/
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void drm_sysfs_destroy(struct class *class)
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{
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if ((class == NULL) || (IS_ERR(class)))
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return;
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class_remove_file(class, &class_attr_version);
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class_destroy(class);
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}
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static ssize_t show_dri(struct class_device *class_device, char *buf)
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{
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struct drm_device * dev = ((struct drm_head *)class_get_devdata(class_device))->dev;
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if (dev->driver->dri_library_name)
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return dev->driver->dri_library_name(dev, buf);
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return snprintf(buf, PAGE_SIZE, "%s\n", dev->driver->pci_driver.name);
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}
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static struct class_device_attribute class_device_attrs[] = {
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__ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
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};
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/**
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* drm_sysfs_device_add - adds a class device to sysfs for a character driver
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* @cs: pointer to the struct class that this device should be registered to.
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* @dev: the dev_t for the device to be added.
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* @device: a pointer to a struct device that is assiociated with this class device.
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* @fmt: string for the class device's name
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*
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* A struct class_device will be created in sysfs, registered to the specified
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* class. A "dev" file will be created, showing the dev_t for the device. The
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* pointer to the struct class_device will be returned from the call. Any further
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* sysfs files that might be required can be created using this pointer.
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* Note: the struct class passed to this function must have previously been
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* created with a call to drm_sysfs_create().
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*/
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struct class_device *drm_sysfs_device_add(struct class *cs, struct drm_head *head)
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{
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struct class_device *class_dev;
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int i, j, err;
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class_dev = class_device_create(cs, NULL,
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MKDEV(DRM_MAJOR, head->minor),
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&(head->dev->pdev)->dev,
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"card%d", head->minor);
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if (IS_ERR(class_dev)) {
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err = PTR_ERR(class_dev);
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goto err_out;
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}
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class_set_devdata(class_dev, head);
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for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) {
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err = class_device_create_file(class_dev,
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&class_device_attrs[i]);
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if (err)
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goto err_out_files;
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}
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return class_dev;
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err_out_files:
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if (i > 0)
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for (j = 0; j < i; j++)
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class_device_remove_file(class_dev,
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&class_device_attrs[i]);
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class_device_unregister(class_dev);
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err_out:
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return ERR_PTR(err);
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}
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/**
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* drm_sysfs_device_remove - removes a class device that was created with drm_sysfs_device_add()
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* @dev: the dev_t of the device that was previously registered.
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*
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* This call unregisters and cleans up a class device that was created with a
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* call to drm_sysfs_device_add()
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*/
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void drm_sysfs_device_remove(struct class_device *class_dev)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
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class_device_remove_file(class_dev, &class_device_attrs[i]);
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class_device_unregister(class_dev);
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}
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