projects/linux·blob assoc-array-fixes-v2 · refs

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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/extcon/devres.c - EXTCON device's resource management
4 *
5 * Copyright (C) 2016 Samsung Electronics
6 * Author: Chanwoo Choi <[email protected]>
7 */
8
9#include "extcon.h"
10
11static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
12{
13 struct extcon_dev **r = res;
14
15 if (WARN_ON(!r || !*r))
16 return 0;
17
18 return *r == data;
19}
20
21static void devm_extcon_dev_release(struct device *dev, void *res)
22{
23 extcon_dev_free(*(struct extcon_dev **)res);
24}
25
26
27static void devm_extcon_dev_unreg(struct device *dev, void *res)
28{
29 extcon_dev_unregister(*(struct extcon_dev **)res);
30}
31
32struct extcon_dev_notifier_devres {
33 struct extcon_dev *edev;
34 unsigned int id;
35 struct notifier_block *nb;
36};
37
38static void devm_extcon_dev_notifier_unreg(struct device *dev, void *res)
39{
40 struct extcon_dev_notifier_devres *this = res;
41
42 extcon_unregister_notifier(this->edev, this->id, this->nb);
43}
44
45static void devm_extcon_dev_notifier_all_unreg(struct device *dev, void *res)
46{
47 struct extcon_dev_notifier_devres *this = res;
48
49 extcon_unregister_notifier_all(this->edev, this->nb);
50}
51
52/**
53 * devm_extcon_dev_allocate - Allocate managed extcon device
54 * @dev: the device owning the extcon device being created
55 * @supported_cable: the array of the supported external connectors
56 * ending with EXTCON_NONE.
57 *
58 * This function manages automatically the memory of extcon device using device
59 * resource management and simplify the control of freeing the memory of extcon
60 * device.
61 *
62 * Returns the pointer memory of allocated extcon_dev if success
63 * or ERR_PTR(err) if fail
64 */
65struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
66 const unsigned int *supported_cable)
67{
68 struct extcon_dev **ptr, *edev;
69
70 ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
71 if (!ptr)
72 return ERR_PTR(-ENOMEM);
73
74 edev = extcon_dev_allocate(supported_cable);
75 if (IS_ERR(edev)) {
76 devres_free(ptr);
77 return edev;
78 }
79
80 edev->dev.parent = dev;
81
82 *ptr = edev;
83 devres_add(dev, ptr);
84
85 return edev;
86}
87EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate);
88
89/**
90 * devm_extcon_dev_free() - Resource-managed extcon_dev_unregister()
91 * @dev: the device owning the extcon device being created
92 * @edev: the extcon device to be freed
93 *
94 * Free the memory that is allocated with devm_extcon_dev_allocate()
95 * function.
96 */
97void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
98{
99 WARN_ON(devres_release(dev, devm_extcon_dev_release,
100 devm_extcon_dev_match, edev));
101}
102EXPORT_SYMBOL_GPL(devm_extcon_dev_free);
103
104/**
105 * devm_extcon_dev_register() - Resource-managed extcon_dev_register()
106 * @dev: the device owning the extcon device being created
107 * @edev: the extcon device to be registered
108 *
109 * this function, that extcon device is automatically unregistered on driver
110 * detach. Internally this function calls extcon_dev_register() function.
111 * To get more information, refer that function.
112 *
113 * If extcon device is registered with this function and the device needs to be
114 * unregistered separately, devm_extcon_dev_unregister() should be used.
115 *
116 * Returns 0 if success or negaive error number if failure.
117 */
118int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev)
119{
120 struct extcon_dev **ptr;
121 int ret;
122
123 ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL);
124 if (!ptr)
125 return -ENOMEM;
126
127 ret = extcon_dev_register(edev);
128 if (ret) {
129 devres_free(ptr);
130 return ret;
131 }
132
133 *ptr = edev;
134 devres_add(dev, ptr);
135
136 return 0;
137}
138EXPORT_SYMBOL_GPL(devm_extcon_dev_register);
139
140/**
141 * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
142 * @dev: the device owning the extcon device being created
143 * @edev: the extcon device to unregistered
144 *
145 * Unregister extcon device that is registered with devm_extcon_dev_register()
146 * function.
147 */
148void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
149{
150 WARN_ON(devres_release(dev, devm_extcon_dev_unreg,
151 devm_extcon_dev_match, edev));
152}
153EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
154
155/**
156 * devm_extcon_register_notifier() - Resource-managed extcon_register_notifier()
157 * @dev: the device owning the extcon device being created
158 * @edev: the extcon device
159 * @id: the unique id among the extcon enumeration
160 * @nb: a notifier block to be registered
161 *
162 * This function manages automatically the notifier of extcon device using
163 * device resource management and simplify the control of unregistering
164 * the notifier of extcon device.
165 *
166 * Note that the second parameter given to the callback of nb (val) is
167 * "old_state", not the current state. The current state can be retrieved
168 * by looking at the third pameter (edev pointer)'s state value.
169 *
170 * Returns 0 if success or negaive error number if failure.
171 */
172int devm_extcon_register_notifier(struct device *dev, struct extcon_dev *edev,
173 unsigned int id, struct notifier_block *nb)
174{
175 struct extcon_dev_notifier_devres *ptr;
176 int ret;
177
178 ptr = devres_alloc(devm_extcon_dev_notifier_unreg, sizeof(*ptr),
179 GFP_KERNEL);
180 if (!ptr)
181 return -ENOMEM;
182
183 ret = extcon_register_notifier(edev, id, nb);
184 if (ret) {
185 devres_free(ptr);
186 return ret;
187 }
188
189 ptr->edev = edev;
190 ptr->id = id;
191 ptr->nb = nb;
192 devres_add(dev, ptr);
193
194 return 0;
195}
196EXPORT_SYMBOL(devm_extcon_register_notifier);
197
198/**
199 * devm_extcon_unregister_notifier()
200 * - Resource-managed extcon_unregister_notifier()
201 * @dev: the device owning the extcon device being created
202 * @edev: the extcon device
203 * @id: the unique id among the extcon enumeration
204 * @nb: a notifier block to be registered
205 */
206void devm_extcon_unregister_notifier(struct device *dev,
207 struct extcon_dev *edev, unsigned int id,
208 struct notifier_block *nb)
209{
210 WARN_ON(devres_release(dev, devm_extcon_dev_notifier_unreg,
211 devm_extcon_dev_match, edev));
212}
213EXPORT_SYMBOL(devm_extcon_unregister_notifier);
214
215/**
216 * devm_extcon_register_notifier_all()
217 * - Resource-managed extcon_register_notifier_all()
218 * @dev: the device owning the extcon device being created
219 * @edev: the extcon device
220 * @nb: a notifier block to be registered
221 *
222 * This function manages automatically the notifier of extcon device using
223 * device resource management and simplify the control of unregistering
224 * the notifier of extcon device. To get more information, refer that function.
225 *
226 * Returns 0 if success or negaive error number if failure.
227 */
228int devm_extcon_register_notifier_all(struct device *dev, struct extcon_dev *edev,
229 struct notifier_block *nb)
230{
231 struct extcon_dev_notifier_devres *ptr;
232 int ret;
233
234 ptr = devres_alloc(devm_extcon_dev_notifier_all_unreg, sizeof(*ptr),
235 GFP_KERNEL);
236 if (!ptr)
237 return -ENOMEM;
238
239 ret = extcon_register_notifier_all(edev, nb);
240 if (ret) {
241 devres_free(ptr);
242 return ret;
243 }
244
245 ptr->edev = edev;
246 ptr->nb = nb;
247 devres_add(dev, ptr);
248
249 return 0;
250}
251EXPORT_SYMBOL(devm_extcon_register_notifier_all);
252
253/**
254 * devm_extcon_unregister_notifier_all()
255 * - Resource-managed extcon_unregister_notifier_all()
256 * @dev: the device owning the extcon device being created
257 * @edev: the extcon device
258 * @nb: a notifier block to be registered
259 */
260void devm_extcon_unregister_notifier_all(struct device *dev,
261 struct extcon_dev *edev,
262 struct notifier_block *nb)
263{
264 WARN_ON(devres_release(dev, devm_extcon_dev_notifier_all_unreg,
265 devm_extcon_dev_match, edev));
266}
267EXPORT_SYMBOL(devm_extcon_unregister_notifier_all);