mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
204 lines
5.1 KiB
C
204 lines
5.1 KiB
C
|
|
/*
|
|
* 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_device(d) container_of(d, struct drm_device, dev)
|
|
|
|
/**
|
|
* 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_device *drm_dev = to_drm_device(dev);
|
|
|
|
printk(KERN_ERR "%s\n", __FUNCTION__);
|
|
|
|
if (drm_dev->driver->suspend)
|
|
return drm_dev->driver->suspend(drm_dev);
|
|
|
|
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_device *drm_dev = to_drm_device(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_device *dev = to_drm_device(device);
|
|
if (dev->driver->dri_library_name)
|
|
return dev->driver->dri_library_name(dev, buf);
|
|
return snprintf(buf, PAGE_SIZE, "%s\n", 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_device *dev, struct drm_head *head)
|
|
{
|
|
int err;
|
|
int i, j;
|
|
|
|
dev->dev.parent = &dev->pdev->dev;
|
|
dev->dev.class = drm_class;
|
|
dev->dev.release = drm_sysfs_device_release;
|
|
dev->dev.devt = head->device;
|
|
snprintf(dev->dev.bus_id, BUS_ID_SIZE, "card%d", head->minor);
|
|
|
|
err = device_register(&dev->dev);
|
|
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(&dev->dev, &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(&dev->dev, &device_attrs[i]);
|
|
device_unregister(&dev->dev);
|
|
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_device *dev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
|
|
device_remove_file(&dev->dev, &device_attrs[i]);
|
|
device_unregister(&dev->dev);
|
|
}
|