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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 | ||
17 | #include <linux/extcon.h> | |
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 | ||
40 | /** | |
41 | * devm_extcon_dev_allocate - Allocate managed extcon device | |
42 | * @dev: device owning the extcon device being created | |
43 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. | |
44 | * If supported_cable is NULL, cable name related APIs | |
45 | * are disabled. | |
46 | * | |
47 | * This function manages automatically the memory of extcon device using device | |
48 | * resource management and simplify the control of freeing the memory of extcon | |
49 | * device. | |
50 | * | |
51 | * Returns the pointer memory of allocated extcon_dev if success | |
52 | * or ERR_PTR(err) if fail | |
53 | */ | |
54 | struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, | |
55 | const unsigned int *supported_cable) | |
56 | { | |
57 | struct extcon_dev **ptr, *edev; | |
58 | ||
59 | ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); | |
60 | if (!ptr) | |
61 | return ERR_PTR(-ENOMEM); | |
62 | ||
63 | edev = extcon_dev_allocate(supported_cable); | |
64 | if (IS_ERR(edev)) { | |
65 | devres_free(ptr); | |
66 | return edev; | |
67 | } | |
68 | ||
69 | edev->dev.parent = dev; | |
70 | ||
71 | *ptr = edev; | |
72 | devres_add(dev, ptr); | |
73 | ||
74 | return edev; | |
75 | } | |
76 | EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); | |
77 | ||
78 | /** | |
79 | * devm_extcon_dev_free() - Resource-managed extcon_dev_unregister() | |
80 | * @dev: device the extcon belongs to | |
81 | * @edev: the extcon device to unregister | |
82 | * | |
83 | * Free the memory that is allocated with devm_extcon_dev_allocate() | |
84 | * function. | |
85 | */ | |
86 | void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) | |
87 | { | |
88 | WARN_ON(devres_release(dev, devm_extcon_dev_release, | |
89 | devm_extcon_dev_match, edev)); | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(devm_extcon_dev_free); | |
92 | ||
93 | /** | |
94 | * devm_extcon_dev_register() - Resource-managed extcon_dev_register() | |
95 | * @dev: device to allocate extcon device | |
96 | * @edev: the new extcon device to register | |
97 | * | |
98 | * Managed extcon_dev_register() function. If extcon device is attached with | |
99 | * this function, that extcon device is automatically unregistered on driver | |
100 | * detach. Internally this function calls extcon_dev_register() function. | |
101 | * To get more information, refer that function. | |
102 | * | |
103 | * If extcon device is registered with this function and the device needs to be | |
104 | * unregistered separately, devm_extcon_dev_unregister() should be used. | |
105 | * | |
106 | * Returns 0 if success or negaive error number if failure. | |
107 | */ | |
108 | int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) | |
109 | { | |
110 | struct extcon_dev **ptr; | |
111 | int ret; | |
112 | ||
113 | ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); | |
114 | if (!ptr) | |
115 | return -ENOMEM; | |
116 | ||
117 | ret = extcon_dev_register(edev); | |
118 | if (ret) { | |
119 | devres_free(ptr); | |
120 | return ret; | |
121 | } | |
122 | ||
123 | *ptr = edev; | |
124 | devres_add(dev, ptr); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | EXPORT_SYMBOL_GPL(devm_extcon_dev_register); | |
129 | ||
130 | /** | |
131 | * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() | |
132 | * @dev: device the extcon belongs to | |
133 | * @edev: the extcon device to unregister | |
134 | * | |
135 | * Unregister extcon device that is registered with devm_extcon_dev_register() | |
136 | * function. | |
137 | */ | |
138 | void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) | |
139 | { | |
140 | WARN_ON(devres_release(dev, devm_extcon_dev_unreg, | |
141 | devm_extcon_dev_match, edev)); | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); |