dm: core: Allow parents to have platform data for their children
[platform/kernel/u-boot.git] / drivers / core / device-remove.c
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         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                         free(dev->parent_priv);
131                         dev->parent_priv = NULL;
132                 }
133         }
134 }
135
136 int device_remove(struct udevice *dev)
137 {
138         struct driver *drv;
139         int ret;
140
141         if (!dev)
142                 return -EINVAL;
143
144         if (!(dev->flags & DM_FLAG_ACTIVATED))
145                 return 0;
146
147         drv = dev->driver;
148         assert(drv);
149
150         ret = uclass_pre_remove_device(dev);
151         if (ret)
152                 return ret;
153
154         ret = device_chld_remove(dev);
155         if (ret)
156                 goto err;
157
158         if (drv->remove) {
159                 ret = drv->remove(dev);
160                 if (ret)
161                         goto err_remove;
162         }
163
164         if (dev->parent && dev->parent->driver->child_post_remove) {
165                 ret = dev->parent->driver->child_post_remove(dev);
166                 if (ret) {
167                         dm_warn("%s: Device '%s' failed child_post_remove()",
168                                 __func__, dev->name);
169                 }
170         }
171
172         device_free(dev);
173
174         dev->seq = -1;
175         dev->flags &= ~DM_FLAG_ACTIVATED;
176
177         return ret;
178
179 err_remove:
180         /* We can't put the children back */
181         dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
182                 __func__, dev->name);
183 err:
184         ret = uclass_post_probe_device(dev);
185         if (ret) {
186                 dm_warn("%s: Device '%s' failed to post_probe on error path\n",
187                         __func__, dev->name);
188         }
189
190         return ret;
191 }