1 /************************************************************************** 2 * 3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 /* 28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 29 * Jerome Glisse 30 */ 31 #include <linux/module.h> 32 #include <linux/device.h> 33 #include <linux/sched.h> 34 #include <drm/ttm/ttm_module.h> 35 #include <drm/drm_sysfs.h> 36 37 static DECLARE_WAIT_QUEUE_HEAD(exit_q); 38 static atomic_t device_released; 39 40 static struct device_type ttm_drm_class_type = { 41 .name = "ttm", 42 /** 43 * Add pm ops here. 44 */ 45 }; 46 47 static void ttm_drm_class_device_release(struct device *dev) 48 { 49 atomic_set(&device_released, 1); 50 wake_up_all(&exit_q); 51 } 52 53 static struct device ttm_drm_class_device = { 54 .type = &ttm_drm_class_type, 55 .release = &ttm_drm_class_device_release 56 }; 57 58 struct kobject *ttm_get_kobj(void) 59 { 60 struct kobject *kobj = &ttm_drm_class_device.kobj; 61 BUG_ON(kobj == NULL); 62 return kobj; 63 } 64 65 static int __init ttm_init(void) 66 { 67 int ret; 68 69 ret = dev_set_name(&ttm_drm_class_device, "ttm"); 70 if (unlikely(ret != 0)) 71 return ret; 72 73 atomic_set(&device_released, 0); 74 ret = drm_class_device_register(&ttm_drm_class_device); 75 if (unlikely(ret != 0)) 76 goto out_no_dev_reg; 77 78 return 0; 79 out_no_dev_reg: 80 atomic_set(&device_released, 1); 81 wake_up_all(&exit_q); 82 return ret; 83 } 84 85 static void __exit ttm_exit(void) 86 { 87 drm_class_device_unregister(&ttm_drm_class_device); 88 89 /** 90 * Refuse to unload until the TTM device is released. 91 * Not sure this is 100% needed. 92 */ 93 94 wait_event(exit_q, atomic_read(&device_released) == 1); 95 } 96 97 module_init(ttm_init); 98 module_exit(ttm_exit); 99 100 MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse"); 101 MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)"); 102 MODULE_LICENSE("GPL and additional rights"); 103