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/*
* drm_sysfs.c - Modifications to drm_sysfs_class.c to support
* extra sysfs attribute from DRM. Normal drm_sysfs_class
* does not allow adding attributes.
*
* Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
* Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (c) 2003-2004 IBM Corp.
*
* This file is released under the GPLv2
*
*/
#include <linux/device.h>
#include <linux/kdev_t.h>
#include <linux/err.h>
#include "drm_core.h"
#include "drmP.h"
#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
/**
* drm_sysfs_suspend - DRM class suspend hook
* @dev: Linux device to suspend
* @state: power state to enter
*
* Just figures out what the actual struct drm_device associated with
* @dev is and calls its suspend hook, if present.
*/
static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
{
struct drm_minor *drm_minor = to_drm_minor(dev);
struct drm_device *drm_dev = drm_minor->dev;
if (drm_dev->driver->suspend)
return drm_dev->driver->suspend(drm_dev, state);
return 0;
}
/**
* drm_sysfs_resume - DRM class resume hook
* @dev: Linux device to resume
*
* Just figures out what the actual struct drm_device associated with
* @dev is and calls its resume hook, if present.
*/
static int drm_sysfs_resume(struct device *dev)
{
struct drm_minor *drm_minor = to_drm_minor(dev);
struct drm_device *drm_dev = drm_minor->dev;
if (drm_dev->driver->resume)
return drm_dev->driver->resume(drm_dev);
return 0;
}
/* Display the version of drm_core. This doesn't work right in current design */
static ssize_t version_show(struct class *dev, char *buf)
{
return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
}
static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
/**
* drm_sysfs_create - create a struct drm_sysfs_class structure
* @owner: pointer to the module that is to "own" this struct drm_sysfs_class
* @name: pointer to a string for the name of this class.
*
* This is used to create DRM class pointer that can then be used
* in calls to drm_sysfs_device_add().
*
* Note, the pointer created here is to be destroyed when finished by making a
* call to drm_sysfs_destroy().
*/
struct class *drm_sysfs_create(struct module *owner, char *name)
{
struct class *class;
int err;
class = class_create(owner, name);
if (IS_ERR(class)) {
err = PTR_ERR(class);
goto err_out;
}
class->suspend = drm_sysfs_suspend;
class->resume = drm_sysfs_resume;
err = class_create_file(class, &class_attr_version);
if (err)
goto err_out_class;
return class;
err_out_class:
class_destroy(class);
err_out:
return ERR_PTR(err);
}
/**
* drm_sysfs_destroy - destroys DRM class
*
* Destroy the DRM device class.
*/
void drm_sysfs_destroy(void)
{
if ((drm_class == NULL) || (IS_ERR(drm_class)))
return;
class_remove_file(drm_class, &class_attr_version);
class_destroy(drm_class);
}
static ssize_t show_dri(struct device *device, struct device_attribute *attr,
char *buf)
{
struct drm_minor *drm_minor = to_drm_minor(device);
struct drm_device *drm_dev = drm_minor->dev;
if (drm_dev->driver->dri_library_name)
return drm_dev->driver->dri_library_name(drm_dev, buf);
return snprintf(buf, PAGE_SIZE, "%s\n", drm_dev->driver->pci_driver.name);
}
static struct device_attribute device_attrs[] = {
__ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
};
/**
* drm_sysfs_device_release - do nothing
* @dev: Linux device
*
* Normally, this would free the DRM device associated with @dev, along
* with cleaning up any other stuff. But we do that in the DRM core, so
* this function can just return and hope that the core does its job.
*/
static void drm_sysfs_device_release(struct device *dev)
{
return;
}
/**
* drm_sysfs_device_add - adds a class device to sysfs for a character driver
* @dev: DRM device to be added
* @head: DRM head in question
*
* Add a DRM device to the DRM's device model class. We use @dev's PCI device
* as the parent for the Linux device, and make sure it has a file containing
* the driver we're using (for userspace compatibility).
*/
int drm_sysfs_device_add(struct drm_minor *minor)
{
int err;
int i, j;
char *minor_str;
minor->kdev.parent = &minor->dev->pdev->dev;
minor->kdev.class = drm_class;
minor->kdev.release = drm_sysfs_device_release;
minor->kdev.devt = minor->device;
minor_str = "card%d";
snprintf(minor->kdev.bus_id, BUS_ID_SIZE, minor_str, minor->index);
err = device_register(&minor->kdev);
if (err) {
DRM_ERROR("device add failed: %d\n", err);
goto err_out;
}
for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
err = device_create_file(&minor->kdev, &device_attrs[i]);
if (err)
goto err_out_files;
}
return 0;
err_out_files:
if (i > 0)
for (j = 0; j < i; j++)
device_remove_file(&minor->kdev, &device_attrs[i]);
device_unregister(&minor->kdev);
err_out:
return err;
}
/**
* drm_sysfs_device_remove - remove DRM device
* @dev: DRM device to remove
*
* This call unregisters and cleans up a class device that was created with a
* call to drm_sysfs_device_add()
*/
void drm_sysfs_device_remove(struct drm_minor *minor)
{
int i;
for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
device_remove_file(&minor->kdev, &device_attrs[i]);
device_unregister(&minor->kdev);
}
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