104 lines
3 KiB
C
104 lines
3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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* Jerome Glisse
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/sched.h>
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#include <drm/ttm/ttm_module.h>
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#include <drm/drm_sysfs.h>
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static DECLARE_WAIT_QUEUE_HEAD(exit_q);
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static atomic_t device_released;
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static struct device_type ttm_drm_class_type = {
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.name = "ttm",
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/**
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* Add pm ops here.
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*/
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};
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static void ttm_drm_class_device_release(struct device *dev)
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{
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atomic_set(&device_released, 1);
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wake_up_all(&exit_q);
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}
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static struct device ttm_drm_class_device = {
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.type = &ttm_drm_class_type,
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.release = &ttm_drm_class_device_release
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};
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struct kobject *ttm_get_kobj(void)
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{
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struct kobject *kobj = &ttm_drm_class_device.kobj;
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BUG_ON(kobj == NULL);
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return kobj;
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}
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static int __init ttm_init(void)
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{
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int ret;
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ret = dev_set_name(&ttm_drm_class_device, "ttm");
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if (unlikely(ret != 0))
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return ret;
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atomic_set(&device_released, 0);
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ret = drm_class_device_register(&ttm_drm_class_device);
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if (unlikely(ret != 0))
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goto out_no_dev_reg;
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return 0;
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out_no_dev_reg:
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atomic_set(&device_released, 1);
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wake_up_all(&exit_q);
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return ret;
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}
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static void __exit ttm_exit(void)
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{
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drm_class_device_unregister(&ttm_drm_class_device);
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/**
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* Refuse to unload until the TTM device is released.
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* Not sure this is 100% needed.
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*/
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wait_event(exit_q, atomic_read(&device_released) == 1);
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}
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module_init(ttm_init);
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module_exit(ttm_exit);
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MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse");
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MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)");
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MODULE_LICENSE("GPL and additional rights");
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