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0650fd5824
Current drm code doesn't work with userspace programs that listen only to the kernel event netlink socket as it is trying to create its own dev interface. Turns out lots of code can just be deleted as the driver core can do all of this work automatically for you. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
130 lines
4 KiB
C
130 lines
4 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/config.h>
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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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class = class_create(owner, name);
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if (!class)
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return class;
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class_create_file(class, &class_attr_version);
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return class;
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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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drm_device_t * dev = ((drm_head_t *)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, drm_head_t *head)
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{
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struct class_device *class_dev;
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int i;
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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 (!class_dev)
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return NULL;
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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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class_device_create_file(class_dev, &class_device_attrs[i]);
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return class_dev;
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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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