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b225d00f CC |
1 | /* |
2 | * drivers/extcon/devres.c - EXTCON device's resource management | |
3 | * | |
4 | * Copyright (C) 2016 Samsung Electronics | |
5 | * Author: Chanwoo Choi <cw00.choi@samsung.com> | |
6 | * | |
7 | * This software is licensed under the terms of the GNU General Public | |
8 | * License version 2, as published by the Free Software Foundation, and | |
9 | * may be copied, distributed, and modified under those terms. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
e6cf0465 | 17 | #include "extcon.h" |
b225d00f CC |
18 | |
19 | static int devm_extcon_dev_match(struct device *dev, void *res, void *data) | |
20 | { | |
21 | struct extcon_dev **r = res; | |
22 | ||
23 | if (WARN_ON(!r || !*r)) | |
24 | return 0; | |
25 | ||
26 | return *r == data; | |
27 | } | |
28 | ||
29 | static void devm_extcon_dev_release(struct device *dev, void *res) | |
30 | { | |
31 | extcon_dev_free(*(struct extcon_dev **)res); | |
32 | } | |
33 | ||
34 | ||
35 | static void devm_extcon_dev_unreg(struct device *dev, void *res) | |
36 | { | |
37 | extcon_dev_unregister(*(struct extcon_dev **)res); | |
38 | } | |
39 | ||
58f38656 CC |
40 | struct extcon_dev_notifier_devres { |
41 | struct extcon_dev *edev; | |
42 | unsigned int id; | |
43 | struct notifier_block *nb; | |
44 | }; | |
45 | ||
46 | static void devm_extcon_dev_notifier_unreg(struct device *dev, void *res) | |
47 | { | |
48 | struct extcon_dev_notifier_devres *this = res; | |
49 | ||
50 | extcon_unregister_notifier(this->edev, this->id, this->nb); | |
51 | } | |
52 | ||
b225d00f CC |
53 | /** |
54 | * devm_extcon_dev_allocate - Allocate managed extcon device | |
55 | * @dev: device owning the extcon device being created | |
56 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. | |
57 | * If supported_cable is NULL, cable name related APIs | |
58 | * are disabled. | |
59 | * | |
60 | * This function manages automatically the memory of extcon device using device | |
61 | * resource management and simplify the control of freeing the memory of extcon | |
62 | * device. | |
63 | * | |
64 | * Returns the pointer memory of allocated extcon_dev if success | |
65 | * or ERR_PTR(err) if fail | |
66 | */ | |
67 | struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, | |
68 | const unsigned int *supported_cable) | |
69 | { | |
70 | struct extcon_dev **ptr, *edev; | |
71 | ||
72 | ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); | |
73 | if (!ptr) | |
74 | return ERR_PTR(-ENOMEM); | |
75 | ||
76 | edev = extcon_dev_allocate(supported_cable); | |
77 | if (IS_ERR(edev)) { | |
78 | devres_free(ptr); | |
79 | return edev; | |
80 | } | |
81 | ||
82 | edev->dev.parent = dev; | |
83 | ||
84 | *ptr = edev; | |
85 | devres_add(dev, ptr); | |
86 | ||
87 | return edev; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); | |
90 | ||
91 | /** | |
92 | * devm_extcon_dev_free() - Resource-managed extcon_dev_unregister() | |
93 | * @dev: device the extcon belongs to | |
94 | * @edev: the extcon device to unregister | |
95 | * | |
96 | * Free the memory that is allocated with devm_extcon_dev_allocate() | |
97 | * function. | |
98 | */ | |
99 | void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) | |
100 | { | |
101 | WARN_ON(devres_release(dev, devm_extcon_dev_release, | |
102 | devm_extcon_dev_match, edev)); | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(devm_extcon_dev_free); | |
105 | ||
106 | /** | |
107 | * devm_extcon_dev_register() - Resource-managed extcon_dev_register() | |
108 | * @dev: device to allocate extcon device | |
109 | * @edev: the new extcon device to register | |
110 | * | |
111 | * Managed extcon_dev_register() function. If extcon device is attached with | |
112 | * this function, that extcon device is automatically unregistered on driver | |
113 | * detach. Internally this function calls extcon_dev_register() function. | |
114 | * To get more information, refer that function. | |
115 | * | |
116 | * If extcon device is registered with this function and the device needs to be | |
117 | * unregistered separately, devm_extcon_dev_unregister() should be used. | |
118 | * | |
119 | * Returns 0 if success or negaive error number if failure. | |
120 | */ | |
121 | int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) | |
122 | { | |
123 | struct extcon_dev **ptr; | |
124 | int ret; | |
125 | ||
126 | ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); | |
127 | if (!ptr) | |
128 | return -ENOMEM; | |
129 | ||
130 | ret = extcon_dev_register(edev); | |
131 | if (ret) { | |
132 | devres_free(ptr); | |
133 | return ret; | |
134 | } | |
135 | ||
136 | *ptr = edev; | |
137 | devres_add(dev, ptr); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | EXPORT_SYMBOL_GPL(devm_extcon_dev_register); | |
142 | ||
143 | /** | |
144 | * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() | |
145 | * @dev: device the extcon belongs to | |
146 | * @edev: the extcon device to unregister | |
147 | * | |
148 | * Unregister extcon device that is registered with devm_extcon_dev_register() | |
149 | * function. | |
150 | */ | |
151 | void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) | |
152 | { | |
153 | WARN_ON(devres_release(dev, devm_extcon_dev_unreg, | |
154 | devm_extcon_dev_match, edev)); | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); | |
58f38656 CC |
157 | |
158 | /** | |
159 | * devm_extcon_register_notifier() - Resource-managed extcon_register_notifier() | |
160 | * @dev: device to allocate extcon device | |
161 | * @edev: the extcon device that has the external connecotr. | |
162 | * @id: the unique id of each external connector in extcon enumeration. | |
163 | * @nb: a notifier block to be registered. | |
164 | * | |
165 | * This function manages automatically the notifier of extcon device using | |
166 | * device resource management and simplify the control of unregistering | |
167 | * the notifier of extcon device. | |
168 | * | |
169 | * Note that the second parameter given to the callback of nb (val) is | |
170 | * "old_state", not the current state. The current state can be retrieved | |
171 | * by looking at the third pameter (edev pointer)'s state value. | |
172 | * | |
173 | * Returns 0 if success or negaive error number if failure. | |
174 | */ | |
175 | int devm_extcon_register_notifier(struct device *dev, struct extcon_dev *edev, | |
176 | unsigned int id, struct notifier_block *nb) | |
177 | { | |
178 | struct extcon_dev_notifier_devres *ptr; | |
179 | int ret; | |
180 | ||
181 | ptr = devres_alloc(devm_extcon_dev_notifier_unreg, sizeof(*ptr), | |
182 | GFP_KERNEL); | |
183 | if (!ptr) | |
184 | return -ENOMEM; | |
185 | ||
186 | ret = extcon_register_notifier(edev, id, nb); | |
187 | if (ret) { | |
188 | devres_free(ptr); | |
189 | return ret; | |
190 | } | |
191 | ||
192 | ptr->edev = edev; | |
193 | ptr->id = id; | |
194 | ptr->nb = nb; | |
195 | devres_add(dev, ptr); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | EXPORT_SYMBOL(devm_extcon_register_notifier); | |
200 | ||
201 | /** | |
202 | * devm_extcon_unregister_notifier() | |
203 | - Resource-managed extcon_unregister_notifier() | |
204 | * @dev: device to allocate extcon device | |
205 | * @edev: the extcon device that has the external connecotr. | |
206 | * @id: the unique id of each external connector in extcon enumeration. | |
207 | * @nb: a notifier block to be registered. | |
208 | */ | |
209 | void devm_extcon_unregister_notifier(struct device *dev, | |
210 | struct extcon_dev *edev, unsigned int id, | |
211 | struct notifier_block *nb) | |
212 | { | |
213 | WARN_ON(devres_release(dev, devm_extcon_dev_notifier_unreg, | |
214 | devm_extcon_dev_match, edev)); | |
215 | } | |
216 | EXPORT_SYMBOL(devm_extcon_unregister_notifier); |