| | 1 | /* |
| | 2 | * sys.c - pseudo-bus for system 'devices' (cpus, PICs, timers, etc) |
| | 3 | * |
| | 4 | * Copyright (c) 2002-3 Patrick Mochel |
| | 5 | * 2002-3 Open Source Development Lab |
| | 6 | * This Edition is maintained by Matthew Veety (aliasxerog) <mveety@gmail.com> |
| | 7 | * |
| | 8 | * This file is released under the GPLv2 |
| | 9 | * |
| | 10 | * This exports a 'system' bus type. |
| | 11 | * By default, a 'sys' bus gets added to the root of the system. There will |
| | 12 | * always be core system devices. Devices can use sysdev_register() to |
| | 13 | * add themselves as children of the system bus. |
| | 14 | */ |
| | 15 | |
| | 16 | #include <linux/sysdev.h> |
| | 17 | #include <linux/err.h> |
| | 18 | #include <linux/module.h> |
| | 19 | #include <linux/kernel.h> |
| | 20 | #include <linux/init.h> |
| | 21 | #include <linux/slab.h> |
| | 22 | #include <linux/string.h> |
| | 23 | #include <linux/pm.h> |
| | 24 | #include <linux/device.h> |
| | 25 | #include <linux/mutex.h> |
| | 26 | #include <linux/smp_lock.h> |
| | 27 | |
| | 28 | |
| | 29 | #define to_sysdev(k) container_of(k, struct sys_device, kobj) |
| | 30 | #define to_sysdev_attr(a) container_of(a, struct sysdev_attribute, attr) |
| | 31 | |
| | 32 | static struct sysdev_class dummy_sysclass = { |
| | 33 | .name="dummy", |
| | 34 | }; |
| | 35 | |
| | 36 | |
| | 37 | /** |
| | 38 | * sysdev_shutdown - Shut down all system devices. |
| | 39 | * |
| | 40 | * Loop over each class of system devices, and the devices in each |
| | 41 | * of those classes. For each device, we call the shutdown method for |
| | 42 | * each driver registered for the device - the auxillaries, |
| | 43 | * and the class driver. |
| | 44 | * |
| | 45 | * Note: The list is iterated in reverse order, so that we shut down |
| | 46 | * child devices before we shut down thier parents. The list ordering |
| | 47 | * is guaranteed by virtue of the fact that child devices are registered |
| | 48 | * after their parents. |
| | 49 | */ |
| | 50 | void sysdev_shutdown(void) |
| | 51 | { |
| | 52 | struct sysdev_class * cls; |
| | 53 | struct kset *system_kset; |
| | 54 | |
| | 55 | pr_debug("Shutting Down System Devices\n"); |
| | 56 | |
| | 57 | lock_kernel(); |
| | 58 | |
| | 59 | sysdev_class_register(&dummy_sysclass); |
| | 60 | cls=&dummy_sysclass; |
| | 61 | system_kset=cls->kset.kobj.kset; |
| | 62 | sysdev_class_unregister(&dummy_sysclass); |
| | 63 | |
| | 64 | list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) { |
| | 65 | struct sys_device * sysdev; |
| | 66 | |
| | 67 | pr_debug("Shutting down type '%s':\n", |
| | 68 | kobject_name(&cls->kset.kobj)); |
| | 69 | |
| | 70 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { |
| | 71 | struct sysdev_driver * drv; |
| | 72 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
| | 73 | |
| | 74 | /* Call auxillary drivers first */ |
| | 75 | list_for_each_entry(drv, &cls->drivers, entry) { |
| | 76 | if (drv->shutdown) |
| | 77 | drv->shutdown(sysdev); |
| | 78 | } |
| | 79 | |
| | 80 | /* Now call the generic one */ |
| | 81 | if (cls->shutdown) |
| | 82 | cls->shutdown(sysdev); |
| | 83 | } |
| | 84 | } |
| | 85 | unlock_kernel(); |
| | 86 | } |
projects / ms2-kexec / blame_incremental