1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * soundbus
4 *
5 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
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
soundbus_dev_get(struct soundbus_dev * dev)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
soundbus_dev_put(struct soundbus_dev * dev)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
soundbus_probe(struct device * dev)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
soundbus_uevent(const struct device * dev,struct kobj_uevent_env * env)58 static int soundbus_uevent(const struct device *dev, struct kobj_uevent_env *env)
59 {
60 const struct soundbus_dev * soundbus_dev;
61 const struct platform_device * of;
62 const char *compat;
63 int retval = 0;
64 int cplen, seen = 0;
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 */
76 retval = add_uevent_var(env, "OF_NAME=%pOFn", of->dev.of_node);
77 if (retval)
78 return retval;
79
80 retval = add_uevent_var(env, "OF_TYPE=%s", of_node_get_device_type(of->dev.of_node));
81 if (retval)
82 return retval;
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
88 compat = of_get_property(of->dev.of_node, "compatible", &cplen);
89 while (compat && cplen > 0) {
90 int tmp = env->buflen;
91 retval = add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
92 if (retval)
93 return retval;
94 compat += env->buflen - tmp;
95 cplen -= env->buflen - tmp;
96 seen += 1;
97 }
98
99 retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
100 if (retval)
101 return retval;
102 retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias);
103
104 return retval;
105 }
106
soundbus_device_remove(struct device * dev)107 static void soundbus_device_remove(struct device *dev)
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);
115 }
116
soundbus_device_shutdown(struct device * dev)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
126 /* soundbus_dev_attrs is declared in sysfs.c */
127 ATTRIBUTE_GROUPS(soundbus_dev);
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,
134 .dev_groups = soundbus_dev_groups,
135 };
136
soundbus_add_one(struct soundbus_dev * dev)137 int soundbus_add_one(struct soundbus_dev *dev)
138 {
139 static int devcount;
140
141 /* sanity checks */
142 if (!dev->attach_codec ||
143 !dev->ofdev.dev.of_node ||
144 dev->pcmname ||
145 dev->pcmid != -1) {
146 printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
147 return -EINVAL;
148 }
149
150 dev_set_name(&dev->ofdev.dev, "soundbus:%x", ++devcount);
151 dev->ofdev.dev.bus = &soundbus_bus_type;
152 return of_device_register(&dev->ofdev);
153 }
154 EXPORT_SYMBOL_GPL(soundbus_add_one);
155
soundbus_remove_one(struct soundbus_dev * dev)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
soundbus_register_driver(struct soundbus_driver * drv)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
soundbus_unregister_driver(struct soundbus_driver * drv)173 void soundbus_unregister_driver(struct soundbus_driver *drv)
174 {
175 driver_unregister(&drv->driver);
176 }
177 EXPORT_SYMBOL_GPL(soundbus_unregister_driver);
178
soundbus_init(void)179 static int __init soundbus_init(void)
180 {
181 return bus_register(&soundbus_bus_type);
182 }
183
soundbus_exit(void)184 static void __exit soundbus_exit(void)
185 {
186 bus_unregister(&soundbus_bus_type);
187 }
188
189 subsys_initcall(soundbus_init);
190 module_exit(soundbus_exit);
191
