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![Dave Airlie](/assets/img/avatar_default.png)
This simplifies the sysfs code for the drm and add a dri_library_name attribute which can be used by a userspace app to figure out which library to load. From: Jon Smirl <jonsmirl@gmail.com> Signed-off-by: Dave Airlie <airlied@linux.ie>
201 lines
5.7 KiB
C
201 lines
5.7 KiB
C
/*
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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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struct drm_sysfs_class {
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struct class_device_attribute attr;
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struct class class;
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};
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#define to_drm_sysfs_class(d) container_of(d, struct drm_sysfs_class, class)
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struct simple_dev {
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dev_t dev;
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struct class_device class_dev;
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};
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#define to_simple_dev(d) container_of(d, struct simple_dev, class_dev)
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static void release_simple_dev(struct class_device *class_dev)
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{
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struct simple_dev *s_dev = to_simple_dev(class_dev);
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kfree(s_dev);
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}
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static ssize_t show_dev(struct class_device *class_dev, char *buf)
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{
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struct simple_dev *s_dev = to_simple_dev(class_dev);
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return print_dev_t(buf, s_dev->dev);
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}
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static void drm_sysfs_class_release(struct class *class)
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{
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struct drm_sysfs_class *cs = to_drm_sysfs_class(class);
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kfree(cs);
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}
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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 drm_sysfs_class *drm_sysfs_create(struct module *owner, char *name)
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{
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struct drm_sysfs_class *cs;
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int retval;
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cs = kmalloc(sizeof(*cs), GFP_KERNEL);
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if (!cs) {
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retval = -ENOMEM;
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goto error;
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}
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memset(cs, 0x00, sizeof(*cs));
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cs->class.name = name;
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cs->class.class_release = drm_sysfs_class_release;
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cs->class.release = release_simple_dev;
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cs->attr.attr.name = "dev";
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cs->attr.attr.mode = S_IRUGO;
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cs->attr.attr.owner = owner;
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cs->attr.show = show_dev;
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cs->attr.store = NULL;
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retval = class_register(&cs->class);
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if (retval)
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goto error;
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class_create_file(&cs->class, &class_attr_version);
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return cs;
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error:
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kfree(cs);
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return ERR_PTR(retval);
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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 drm_sysfs_class *cs)
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{
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if ((cs == NULL) || (IS_ERR(cs)))
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return;
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class_unregister(&cs->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 drm_sysfs_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 drm_sysfs_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 drm_sysfs_class *cs,
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drm_head_t *head)
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{
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struct simple_dev *s_dev = NULL;
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int i, retval;
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if ((cs == NULL) || (IS_ERR(cs))) {
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retval = -ENODEV;
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goto error;
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}
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s_dev = kmalloc(sizeof(*s_dev), GFP_KERNEL);
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if (!s_dev) {
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retval = -ENOMEM;
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goto error;
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}
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memset(s_dev, 0x00, sizeof(*s_dev));
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s_dev->dev = MKDEV(DRM_MAJOR, head->minor);
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s_dev->class_dev.dev = &(head->dev->pdev)->dev;
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s_dev->class_dev.class = &cs->class;
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snprintf(s_dev->class_dev.class_id, BUS_ID_SIZE, "card%d", head->minor);
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retval = class_device_register(&s_dev->class_dev);
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if (retval)
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goto error;
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class_device_create_file(&s_dev->class_dev, &cs->attr);
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class_set_devdata(&s_dev->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(&s_dev->class_dev, &class_device_attrs[i]);
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return &s_dev->class_dev;
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error:
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kfree(s_dev);
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return ERR_PTR(retval);
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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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struct simple_dev *s_dev = to_simple_dev(class_dev);
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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(&s_dev->class_dev, &class_device_attrs[i]);
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class_device_unregister(&s_dev->class_dev);
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}
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