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/**
* \file drm_pm.h
* Power management support
*
* \author José Fonseca <jrfonseca@tungstengraphics.com>
*/
/*
* Copyright 2004 Tungsten Graphics, Inc., Cedar Park, Texas.
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#define __NO_VERSION__
#include "drmP.h"
#include <linux/device.h>
#include <linux/sysdev.h>
static int drm_suspend(struct sys_device *sysdev, u32 state)
{
struct drm_device *dev =
container_of(sysdev, struct drm_device, sysdev);
DRM_DEBUG("state=%d\n", state);
if (dev->driver->power)
return dev->driver->power(dev, state);
else
return 0;
}
static int drm_resume(struct sys_device *sysdev)
{
struct drm_device *dev =
container_of(sysdev, struct drm_device, sysdev);
DRM_DEBUG("\n");
if (dev->driver->power)
return dev->driver->power(dev, 0);
else
return 0;
}
static int shutdown(struct sys_device *sysdev)
{
return 0;
}
static atomic_t sysdev_loaded = ATOMIC_INIT(-1);
static struct sysdev_class drm_sysdev_class = {
set_kset_name("drm"),
.resume = drm_resume,
.suspend = drm_suspend,
.shutdown = shutdown,
};
/**
* Initialize the Power Management data.
*
* \param dev DRM device.
* \return zero on success or a negative value on failure.
*/
int drm_pm_setup(drm_device_t *dev)
{
int rc;
if (atomic_read(&sysdev_loaded) == -1)
return 0;
DRM_DEBUG("\n");
dev->sysdev.id = dev->primary.minor;
dev->sysdev.cls = &drm_sysdev_class;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,4)
rc = sys_device_register(&dev->sysdev);
#else
rc = sysdev_register(&dev->sysdev);
#endif
return rc;
}
/**
* Cleanup the Power Management resources.
*
* \param dev DRM device.
*/
void drm_pm_takedown(drm_device_t *dev)
{
if (atomic_read(&sysdev_loaded) == -1)
return;
DRM_DEBUG("\n");
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,4)
sys_device_unregister(&dev->sysdev);
#else
sysdev_unregister(&dev->sysdev);
#endif
}
int drm_pm_init(void)
{
int rc;
DRM_DEBUG("\n");
/* triggers on -1 to 0 transition */
if (!atomic_inc_and_test(&sysdev_loaded))
return 0;
if ((rc = sysdev_class_register(&drm_sysdev_class))) {
/* reset it back to -1 */
atomic_dec(&sysdev_loaded);
} else {
/* inc it up to 1 so that unload will trigger on 1->0 */
atomic_inc(&sysdev_loaded);
DRM_DEBUG("registered\n");
}
return rc;
}
void __exit drm_pm_exit(void)
{
DRM_DEBUG("\n");
/* triggers on the 1 to 0 transistion */
if (atomic_dec_and_test(&sysdev_loaded)) {
sysdev_class_unregister(&drm_sysdev_class);
DRM_DEBUG("unregisted\n");
}
}
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