Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Device manager |
| 3 | * |
| 4 | * Copyright (c) 2014 Google, Inc |
| 5 | * |
| 6 | * (C) Copyright 2012 |
| 7 | * Pavel Herrmann <morpheus.ibis@gmail.com> |
| 8 | * |
| 9 | * SPDX-License-Identifier: GPL-2.0+ |
| 10 | */ |
| 11 | |
| 12 | #include <common.h> |
| 13 | #include <errno.h> |
| 14 | #include <malloc.h> |
| 15 | #include <dm/device.h> |
| 16 | #include <dm/device-internal.h> |
| 17 | #include <dm/uclass.h> |
| 18 | #include <dm/uclass-internal.h> |
| 19 | #include <dm/util.h> |
| 20 | |
Simon Glass | 79725ca | 2015-11-08 23:47:58 -0700 | [diff] [blame] | 21 | /** |
| 22 | * device_chld_unbind() - Unbind all device's children from the device |
| 23 | * |
| 24 | * On error, the function continues to unbind all children, and reports the |
| 25 | * first error. |
| 26 | * |
| 27 | * @dev: The device that is to be stripped of its children |
| 28 | * @return 0 on success, -ve on error |
| 29 | */ |
| 30 | static int device_chld_unbind(struct udevice *dev) |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 31 | { |
| 32 | struct udevice *pos, *n; |
| 33 | int ret, saved_ret = 0; |
| 34 | |
| 35 | assert(dev); |
| 36 | |
| 37 | list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) { |
| 38 | ret = device_unbind(pos); |
| 39 | if (ret && !saved_ret) |
| 40 | saved_ret = ret; |
| 41 | } |
| 42 | |
| 43 | return saved_ret; |
| 44 | } |
| 45 | |
Simon Glass | 79725ca | 2015-11-08 23:47:58 -0700 | [diff] [blame] | 46 | /** |
| 47 | * device_chld_remove() - Stop all device's children |
| 48 | * @dev: The device whose children are to be removed |
| 49 | * @return 0 on success, -ve on error |
| 50 | */ |
| 51 | static int device_chld_remove(struct udevice *dev) |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 52 | { |
| 53 | struct udevice *pos, *n; |
| 54 | int ret; |
| 55 | |
| 56 | assert(dev); |
| 57 | |
| 58 | list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) { |
| 59 | ret = device_remove(pos); |
| 60 | if (ret) |
| 61 | return ret; |
| 62 | } |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | int device_unbind(struct udevice *dev) |
| 68 | { |
Simon Glass | 3479253 | 2015-03-25 12:21:54 -0600 | [diff] [blame] | 69 | const struct driver *drv; |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 70 | int ret; |
| 71 | |
| 72 | if (!dev) |
| 73 | return -EINVAL; |
| 74 | |
| 75 | if (dev->flags & DM_FLAG_ACTIVATED) |
| 76 | return -EINVAL; |
| 77 | |
Masahiro Yamada | aed1a4d | 2015-07-25 21:52:34 +0900 | [diff] [blame] | 78 | if (!(dev->flags & DM_FLAG_BOUND)) |
| 79 | return -EINVAL; |
| 80 | |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 81 | drv = dev->driver; |
| 82 | assert(drv); |
| 83 | |
| 84 | if (drv->unbind) { |
| 85 | ret = drv->unbind(dev); |
| 86 | if (ret) |
| 87 | return ret; |
| 88 | } |
| 89 | |
Simon Glass | 79725ca | 2015-11-08 23:47:58 -0700 | [diff] [blame] | 90 | ret = device_chld_unbind(dev); |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 91 | if (ret) |
| 92 | return ret; |
| 93 | |
Simon Glass | f8a8544 | 2015-01-25 08:27:00 -0700 | [diff] [blame] | 94 | if (dev->flags & DM_FLAG_ALLOC_PDATA) { |
| 95 | free(dev->platdata); |
| 96 | dev->platdata = NULL; |
| 97 | } |
Przemyslaw Marczak | 5eaed88 | 2015-04-15 13:07:18 +0200 | [diff] [blame] | 98 | if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) { |
| 99 | free(dev->uclass_platdata); |
| 100 | dev->uclass_platdata = NULL; |
| 101 | } |
Simon Glass | cdc133b | 2015-01-25 08:27:01 -0700 | [diff] [blame] | 102 | if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) { |
| 103 | free(dev->parent_platdata); |
| 104 | dev->parent_platdata = NULL; |
| 105 | } |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 106 | ret = uclass_unbind_device(dev); |
| 107 | if (ret) |
| 108 | return ret; |
| 109 | |
| 110 | if (dev->parent) |
| 111 | list_del(&dev->sibling_node); |
Masahiro Yamada | 608f26c | 2015-07-25 21:52:35 +0900 | [diff] [blame] | 112 | |
| 113 | devres_release_all(dev); |
| 114 | |
Simon Glass | a2040fa | 2016-05-01 13:52:23 -0600 | [diff] [blame] | 115 | if (dev->flags & DM_NAME_ALLOCED) |
| 116 | free((char *)dev->name); |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 117 | free(dev); |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * device_free() - Free memory buffers allocated by a device |
| 124 | * @dev: Device that is to be started |
| 125 | */ |
| 126 | void device_free(struct udevice *dev) |
| 127 | { |
| 128 | int size; |
| 129 | |
| 130 | if (dev->driver->priv_auto_alloc_size) { |
| 131 | free(dev->priv); |
| 132 | dev->priv = NULL; |
| 133 | } |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 134 | size = dev->uclass->uc_drv->per_device_auto_alloc_size; |
| 135 | if (size) { |
| 136 | free(dev->uclass_priv); |
| 137 | dev->uclass_priv = NULL; |
| 138 | } |
| 139 | if (dev->parent) { |
| 140 | size = dev->parent->driver->per_child_auto_alloc_size; |
Simon Glass | dac8db2 | 2015-01-25 08:27:06 -0700 | [diff] [blame] | 141 | if (!size) { |
| 142 | size = dev->parent->uclass->uc_drv-> |
| 143 | per_child_auto_alloc_size; |
| 144 | } |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 145 | if (size) { |
| 146 | free(dev->parent_priv); |
| 147 | dev->parent_priv = NULL; |
| 148 | } |
| 149 | } |
Masahiro Yamada | 608f26c | 2015-07-25 21:52:35 +0900 | [diff] [blame] | 150 | |
| 151 | devres_release_probe(dev); |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | int device_remove(struct udevice *dev) |
| 155 | { |
Simon Glass | 3479253 | 2015-03-25 12:21:54 -0600 | [diff] [blame] | 156 | const struct driver *drv; |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 157 | int ret; |
| 158 | |
| 159 | if (!dev) |
| 160 | return -EINVAL; |
| 161 | |
| 162 | if (!(dev->flags & DM_FLAG_ACTIVATED)) |
| 163 | return 0; |
| 164 | |
| 165 | drv = dev->driver; |
| 166 | assert(drv); |
| 167 | |
| 168 | ret = uclass_pre_remove_device(dev); |
| 169 | if (ret) |
| 170 | return ret; |
| 171 | |
Simon Glass | 79725ca | 2015-11-08 23:47:58 -0700 | [diff] [blame] | 172 | ret = device_chld_remove(dev); |
Simon Glass | 3ac435d | 2014-11-10 17:16:47 -0700 | [diff] [blame] | 173 | if (ret) |
| 174 | goto err; |
| 175 | |
| 176 | if (drv->remove) { |
| 177 | ret = drv->remove(dev); |
| 178 | if (ret) |
| 179 | goto err_remove; |
| 180 | } |
| 181 | |
| 182 | if (dev->parent && dev->parent->driver->child_post_remove) { |
| 183 | ret = dev->parent->driver->child_post_remove(dev); |
| 184 | if (ret) { |
| 185 | dm_warn("%s: Device '%s' failed child_post_remove()", |
| 186 | __func__, dev->name); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | device_free(dev); |
| 191 | |
| 192 | dev->seq = -1; |
| 193 | dev->flags &= ~DM_FLAG_ACTIVATED; |
| 194 | |
| 195 | return ret; |
| 196 | |
| 197 | err_remove: |
| 198 | /* We can't put the children back */ |
| 199 | dm_warn("%s: Device '%s' failed to remove, but children are gone\n", |
| 200 | __func__, dev->name); |
| 201 | err: |
| 202 | ret = uclass_post_probe_device(dev); |
| 203 | if (ret) { |
| 204 | dm_warn("%s: Device '%s' failed to post_probe on error path\n", |
| 205 | __func__, dev->name); |
| 206 | } |
| 207 | |
| 208 | return ret; |
| 209 | } |