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 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) 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 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) 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 { 69 const struct driver *drv; 70 int ret; 71 72 if (!dev) 73 return -EINVAL; 74 75 if (dev->flags & DM_FLAG_ACTIVATED) 76 return -EINVAL; 77 78 drv = dev->driver; 79 assert(drv); 80 81 if (drv->unbind) { 82 ret = drv->unbind(dev); 83 if (ret) 84 return ret; 85 } 86 87 ret = device_chld_unbind(dev); 88 if (ret) 89 return ret; 90 91 if (dev->flags & DM_FLAG_ALLOC_PDATA) { 92 free(dev->platdata); 93 dev->platdata = NULL; 94 } 95 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) { 96 free(dev->uclass_platdata); 97 dev->uclass_platdata = NULL; 98 } 99 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) { 100 free(dev->parent_platdata); 101 dev->parent_platdata = NULL; 102 } 103 ret = uclass_unbind_device(dev); 104 if (ret) 105 return ret; 106 107 if (dev->parent) 108 list_del(&dev->sibling_node); 109 free(dev); 110 111 return 0; 112 } 113 114 /** 115 * device_free() - Free memory buffers allocated by a device 116 * @dev: Device that is to be started 117 */ 118 void device_free(struct udevice *dev) 119 { 120 int size; 121 122 if (dev->driver->priv_auto_alloc_size) { 123 free(dev->priv); 124 dev->priv = NULL; 125 } 126 size = dev->uclass->uc_drv->per_device_auto_alloc_size; 127 if (size) { 128 free(dev->uclass_priv); 129 dev->uclass_priv = NULL; 130 } 131 if (dev->parent) { 132 size = dev->parent->driver->per_child_auto_alloc_size; 133 if (!size) { 134 size = dev->parent->uclass->uc_drv-> 135 per_child_auto_alloc_size; 136 } 137 if (size) { 138 free(dev->parent_priv); 139 dev->parent_priv = NULL; 140 } 141 } 142 } 143 144 int device_remove(struct udevice *dev) 145 { 146 const struct driver *drv; 147 int ret; 148 149 if (!dev) 150 return -EINVAL; 151 152 if (!(dev->flags & DM_FLAG_ACTIVATED)) 153 return 0; 154 155 drv = dev->driver; 156 assert(drv); 157 158 ret = uclass_pre_remove_device(dev); 159 if (ret) 160 return ret; 161 162 ret = device_chld_remove(dev); 163 if (ret) 164 goto err; 165 166 if (drv->remove) { 167 ret = drv->remove(dev); 168 if (ret) 169 goto err_remove; 170 } 171 172 if (dev->parent && dev->parent->driver->child_post_remove) { 173 ret = dev->parent->driver->child_post_remove(dev); 174 if (ret) { 175 dm_warn("%s: Device '%s' failed child_post_remove()", 176 __func__, dev->name); 177 } 178 } 179 180 device_free(dev); 181 182 dev->seq = -1; 183 dev->flags &= ~DM_FLAG_ACTIVATED; 184 185 return ret; 186 187 err_remove: 188 /* We can't put the children back */ 189 dm_warn("%s: Device '%s' failed to remove, but children are gone\n", 190 __func__, dev->name); 191 err: 192 ret = uclass_post_probe_device(dev); 193 if (ret) { 194 dm_warn("%s: Device '%s' failed to post_probe on error path\n", 195 __func__, dev->name); 196 } 197 198 return ret; 199 } 200