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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b225d00f | 2 | /* |
6ab6094f | 3 | * drivers/extcon/devres.c - EXTCON device's resource management |
b225d00f CC |
4 | * |
5 | * Copyright (C) 2016 Samsung Electronics | |
6 | * Author: Chanwoo Choi <cw00.choi@samsung.com> | |
b225d00f CC |
7 | */ |
8 | ||
e6cf0465 | 9 | #include "extcon.h" |
b225d00f CC |
10 | |
11 | static 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 | ||
21 | static void devm_extcon_dev_release(struct device *dev, void *res) | |
22 | { | |
23 | extcon_dev_free(*(struct extcon_dev **)res); | |
24 | } | |
25 | ||
26 | ||
27 | static void devm_extcon_dev_unreg(struct device *dev, void *res) | |
28 | { | |
29 | extcon_dev_unregister(*(struct extcon_dev **)res); | |
30 | } | |
31 | ||
58f38656 CC |
32 | struct extcon_dev_notifier_devres { |
33 | struct extcon_dev *edev; | |
34 | unsigned int id; | |
35 | struct notifier_block *nb; | |
36 | }; | |
37 | ||
38 | static 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 | ||
815429b3 CC |
45 | static 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 | ||
b225d00f CC |
52 | /** |
53 | * devm_extcon_dev_allocate - Allocate managed extcon device | |
6ab6094f CC |
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. | |
b225d00f CC |
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 | */ | |
65 | struct 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 | } | |
87 | EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); | |
88 | ||
89 | /** | |
90 | * devm_extcon_dev_free() - Resource-managed extcon_dev_unregister() | |
6ab6094f CC |
91 | * @dev: the device owning the extcon device being created |
92 | * @edev: the extcon device to be freed | |
b225d00f CC |
93 | * |
94 | * Free the memory that is allocated with devm_extcon_dev_allocate() | |
95 | * function. | |
96 | */ | |
97 | void 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 | } | |
102 | EXPORT_SYMBOL_GPL(devm_extcon_dev_free); | |
103 | ||
104 | /** | |
105 | * devm_extcon_dev_register() - Resource-managed extcon_dev_register() | |
6ab6094f CC |
106 | * @dev: the device owning the extcon device being created |
107 | * @edev: the extcon device to be registered | |
b225d00f | 108 | * |
b225d00f CC |
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 | */ | |
118 | int 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 | } | |
138 | EXPORT_SYMBOL_GPL(devm_extcon_dev_register); | |
139 | ||
140 | /** | |
141 | * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() | |
6ab6094f CC |
142 | * @dev: the device owning the extcon device being created |
143 | * @edev: the extcon device to unregistered | |
b225d00f CC |
144 | * |
145 | * Unregister extcon device that is registered with devm_extcon_dev_register() | |
146 | * function. | |
147 | */ | |
148 | void 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 | } | |
153 | EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); | |
58f38656 CC |
154 | |
155 | /** | |
156 | * devm_extcon_register_notifier() - Resource-managed extcon_register_notifier() | |
6ab6094f CC |
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 | |
58f38656 CC |
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 | */ | |
172 | int 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 | } | |
196 | EXPORT_SYMBOL(devm_extcon_register_notifier); | |
197 | ||
198 | /** | |
199 | * devm_extcon_unregister_notifier() | |
db8b4aef | 200 | * - Resource-managed extcon_unregister_notifier() |
6ab6094f CC |
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 | |
58f38656 CC |
205 | */ |
206 | void 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 | } | |
213 | EXPORT_SYMBOL(devm_extcon_unregister_notifier); | |
815429b3 CC |
214 | |
215 | /** | |
216 | * devm_extcon_register_notifier_all() | |
217 | * - Resource-managed extcon_register_notifier_all() | |
6ab6094f CC |
218 | * @dev: the device owning the extcon device being created |
219 | * @edev: the extcon device | |
220 | * @nb: a notifier block to be registered | |
815429b3 CC |
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 | */ | |
228 | int 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 | } | |
251 | EXPORT_SYMBOL(devm_extcon_register_notifier_all); | |
252 | ||
253 | /** | |
254 | * devm_extcon_unregister_notifier_all() | |
255 | * - Resource-managed extcon_unregister_notifier_all() | |
6ab6094f CC |
256 | * @dev: the device owning the extcon device being created |
257 | * @edev: the extcon device | |
258 | * @nb: a notifier block to be registered | |
815429b3 CC |
259 | */ |
260 | void 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 | } | |
267 | EXPORT_SYMBOL(devm_extcon_unregister_notifier_all); |