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