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d6869352 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f3d9478b JB |
2 | /* |
3 | * soundbus | |
4 | * | |
5 | * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> | |
f3d9478b JB |
6 | */ |
7 | ||
8 | #include <linux/module.h> | |
9 | #include "soundbus.h" | |
10 | ||
11 | MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); | |
12 | MODULE_LICENSE("GPL"); | |
13 | MODULE_DESCRIPTION("Apple Soundbus"); | |
14 | ||
15 | struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev) | |
16 | { | |
17 | struct device *tmp; | |
18 | ||
19 | if (!dev) | |
20 | return NULL; | |
21 | tmp = get_device(&dev->ofdev.dev); | |
22 | if (tmp) | |
23 | return to_soundbus_device(tmp); | |
24 | else | |
25 | return NULL; | |
26 | } | |
27 | EXPORT_SYMBOL_GPL(soundbus_dev_get); | |
28 | ||
29 | void soundbus_dev_put(struct soundbus_dev *dev) | |
30 | { | |
31 | if (dev) | |
32 | put_device(&dev->ofdev.dev); | |
33 | } | |
34 | EXPORT_SYMBOL_GPL(soundbus_dev_put); | |
35 | ||
36 | static int soundbus_probe(struct device *dev) | |
37 | { | |
38 | int error = -ENODEV; | |
39 | struct soundbus_driver *drv; | |
40 | struct soundbus_dev *soundbus_dev; | |
41 | ||
42 | drv = to_soundbus_driver(dev->driver); | |
43 | soundbus_dev = to_soundbus_device(dev); | |
44 | ||
45 | if (!drv->probe) | |
46 | return error; | |
47 | ||
48 | soundbus_dev_get(soundbus_dev); | |
49 | ||
50 | error = drv->probe(soundbus_dev); | |
51 | if (error) | |
52 | soundbus_dev_put(soundbus_dev); | |
53 | ||
54 | return error; | |
55 | } | |
56 | ||
57 | ||
2a81ada3 | 58 | static int soundbus_uevent(const struct device *dev, struct kobj_uevent_env *env) |
f3d9478b | 59 | { |
2a81ada3 GKH |
60 | const struct soundbus_dev * soundbus_dev; |
61 | const struct platform_device * of; | |
a7edd0e6 | 62 | const char *compat; |
7eff2e7a | 63 | int retval = 0; |
bf62456e | 64 | int cplen, seen = 0; |
f3d9478b JB |
65 | |
66 | if (!dev) | |
67 | return -ENODEV; | |
68 | ||
69 | soundbus_dev = to_soundbus_device(dev); | |
70 | if (!soundbus_dev) | |
71 | return -ENODEV; | |
72 | ||
73 | of = &soundbus_dev->ofdev; | |
74 | ||
75 | /* stuff we want to pass to /sbin/hotplug */ | |
192a7122 | 76 | retval = add_uevent_var(env, "OF_NAME=%pOFn", of->dev.of_node); |
bf62456e ER |
77 | if (retval) |
78 | return retval; | |
79 | ||
c12faa2b | 80 | retval = add_uevent_var(env, "OF_TYPE=%s", of_node_get_device_type(of->dev.of_node)); |
bf62456e ER |
81 | if (retval) |
82 | return retval; | |
f3d9478b JB |
83 | |
84 | /* Since the compatible field can contain pretty much anything | |
85 | * it's not really legal to split it out with commas. We split it | |
86 | * up using a number of environment variables instead. */ | |
87 | ||
61c7a080 | 88 | compat = of_get_property(of->dev.of_node, "compatible", &cplen); |
f3d9478b | 89 | while (compat && cplen > 0) { |
7eff2e7a KS |
90 | int tmp = env->buflen; |
91 | retval = add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat); | |
bf62456e ER |
92 | if (retval) |
93 | return retval; | |
7eff2e7a KS |
94 | compat += env->buflen - tmp; |
95 | cplen -= env->buflen - tmp; | |
bf62456e | 96 | seen += 1; |
f3d9478b JB |
97 | } |
98 | ||
7eff2e7a | 99 | retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); |
bf62456e ER |
100 | if (retval) |
101 | return retval; | |
7eff2e7a | 102 | retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias); |
f3d9478b | 103 | |
bf62456e | 104 | return retval; |
f3d9478b JB |
105 | } |
106 | ||
fc7a6209 | 107 | static void soundbus_device_remove(struct device *dev) |
f3d9478b JB |
108 | { |
109 | struct soundbus_dev * soundbus_dev = to_soundbus_device(dev); | |
110 | struct soundbus_driver * drv = to_soundbus_driver(dev->driver); | |
111 | ||
112 | if (dev->driver && drv->remove) | |
113 | drv->remove(soundbus_dev); | |
114 | soundbus_dev_put(soundbus_dev); | |
f3d9478b JB |
115 | } |
116 | ||
117 | static void soundbus_device_shutdown(struct device *dev) | |
118 | { | |
119 | struct soundbus_dev * soundbus_dev = to_soundbus_device(dev); | |
120 | struct soundbus_driver * drv = to_soundbus_driver(dev->driver); | |
121 | ||
122 | if (dev->driver && drv->shutdown) | |
123 | drv->shutdown(soundbus_dev); | |
124 | } | |
125 | ||
a038b979 QL |
126 | /* soundbus_dev_attrs is declared in sysfs.c */ |
127 | ATTRIBUTE_GROUPS(soundbus_dev); | |
f3d9478b JB |
128 | static struct bus_type soundbus_bus_type = { |
129 | .name = "aoa-soundbus", | |
130 | .probe = soundbus_probe, | |
131 | .uevent = soundbus_uevent, | |
132 | .remove = soundbus_device_remove, | |
133 | .shutdown = soundbus_device_shutdown, | |
a038b979 | 134 | .dev_groups = soundbus_dev_groups, |
f3d9478b JB |
135 | }; |
136 | ||
f3d9478b JB |
137 | int soundbus_add_one(struct soundbus_dev *dev) |
138 | { | |
139 | static int devcount; | |
140 | ||
141 | /* sanity checks */ | |
142 | if (!dev->attach_codec || | |
61c7a080 | 143 | !dev->ofdev.dev.of_node || |
f3d9478b JB |
144 | dev->pcmname || |
145 | dev->pcmid != -1) { | |
146 | printk(KERN_ERR "soundbus: adding device failed sanity check!\n"); | |
147 | return -EINVAL; | |
148 | } | |
149 | ||
bb072bf0 | 150 | dev_set_name(&dev->ofdev.dev, "soundbus:%x", ++devcount); |
f3d9478b JB |
151 | dev->ofdev.dev.bus = &soundbus_bus_type; |
152 | return of_device_register(&dev->ofdev); | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(soundbus_add_one); | |
155 | ||
156 | void soundbus_remove_one(struct soundbus_dev *dev) | |
157 | { | |
158 | of_device_unregister(&dev->ofdev); | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(soundbus_remove_one); | |
161 | ||
162 | int soundbus_register_driver(struct soundbus_driver *drv) | |
163 | { | |
164 | /* initialize common driver fields */ | |
165 | drv->driver.name = drv->name; | |
166 | drv->driver.bus = &soundbus_bus_type; | |
167 | ||
168 | /* register with core */ | |
169 | return driver_register(&drv->driver); | |
170 | } | |
171 | EXPORT_SYMBOL_GPL(soundbus_register_driver); | |
172 | ||
173 | void soundbus_unregister_driver(struct soundbus_driver *drv) | |
174 | { | |
175 | driver_unregister(&drv->driver); | |
176 | } | |
177 | EXPORT_SYMBOL_GPL(soundbus_unregister_driver); | |
178 | ||
a08bc4cb BH |
179 | static int __init soundbus_init(void) |
180 | { | |
181 | return bus_register(&soundbus_bus_type); | |
182 | } | |
183 | ||
184 | static void __exit soundbus_exit(void) | |
185 | { | |
186 | bus_unregister(&soundbus_bus_type); | |
187 | } | |
188 | ||
189 | subsys_initcall(soundbus_init); | |
f3d9478b | 190 | module_exit(soundbus_exit); |