1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
8 #include <linux/module.h>
10 #include <linux/of_platform.h>
13 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
14 MODULE_LICENSE("GPL");
15 MODULE_DESCRIPTION("Apple Soundbus");
17 struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev)
23 tmp = get_device(&dev->ofdev.dev);
25 return to_soundbus_device(tmp);
29 EXPORT_SYMBOL_GPL(soundbus_dev_get);
31 void soundbus_dev_put(struct soundbus_dev *dev)
34 put_device(&dev->ofdev.dev);
36 EXPORT_SYMBOL_GPL(soundbus_dev_put);
38 static int soundbus_probe(struct device *dev)
41 struct soundbus_driver *drv;
42 struct soundbus_dev *soundbus_dev;
44 drv = to_soundbus_driver(dev->driver);
45 soundbus_dev = to_soundbus_device(dev);
50 soundbus_dev_get(soundbus_dev);
52 error = drv->probe(soundbus_dev);
54 soundbus_dev_put(soundbus_dev);
60 static int soundbus_uevent(const struct device *dev, struct kobj_uevent_env *env)
62 const struct soundbus_dev * soundbus_dev;
63 const struct platform_device * of;
71 soundbus_dev = to_soundbus_device(dev);
75 of = &soundbus_dev->ofdev;
77 /* stuff we want to pass to /sbin/hotplug */
78 retval = add_uevent_var(env, "OF_NAME=%pOFn", of->dev.of_node);
82 retval = add_uevent_var(env, "OF_TYPE=%s", of_node_get_device_type(of->dev.of_node));
86 /* Since the compatible field can contain pretty much anything
87 * it's not really legal to split it out with commas. We split it
88 * up using a number of environment variables instead. */
90 compat = of_get_property(of->dev.of_node, "compatible", &cplen);
91 while (compat && cplen > 0) {
92 int tmp = env->buflen;
93 retval = add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
96 compat += env->buflen - tmp;
97 cplen -= env->buflen - tmp;
101 retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
104 retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias);
109 static void soundbus_device_remove(struct device *dev)
111 struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
112 struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
114 if (dev->driver && drv->remove)
115 drv->remove(soundbus_dev);
116 soundbus_dev_put(soundbus_dev);
119 static void soundbus_device_shutdown(struct device *dev)
121 struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
122 struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
124 if (dev->driver && drv->shutdown)
125 drv->shutdown(soundbus_dev);
128 /* soundbus_dev_attrs is declared in sysfs.c */
129 ATTRIBUTE_GROUPS(soundbus_dev);
130 static struct bus_type soundbus_bus_type = {
131 .name = "aoa-soundbus",
132 .probe = soundbus_probe,
133 .uevent = soundbus_uevent,
134 .remove = soundbus_device_remove,
135 .shutdown = soundbus_device_shutdown,
136 .dev_groups = soundbus_dev_groups,
139 int soundbus_add_one(struct soundbus_dev *dev)
144 if (!dev->attach_codec ||
145 !dev->ofdev.dev.of_node ||
148 printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
152 dev_set_name(&dev->ofdev.dev, "soundbus:%x", ++devcount);
153 dev->ofdev.dev.bus = &soundbus_bus_type;
154 return of_device_register(&dev->ofdev);
156 EXPORT_SYMBOL_GPL(soundbus_add_one);
158 void soundbus_remove_one(struct soundbus_dev *dev)
160 of_device_unregister(&dev->ofdev);
162 EXPORT_SYMBOL_GPL(soundbus_remove_one);
164 int soundbus_register_driver(struct soundbus_driver *drv)
166 /* initialize common driver fields */
167 drv->driver.name = drv->name;
168 drv->driver.bus = &soundbus_bus_type;
170 /* register with core */
171 return driver_register(&drv->driver);
173 EXPORT_SYMBOL_GPL(soundbus_register_driver);
175 void soundbus_unregister_driver(struct soundbus_driver *drv)
177 driver_unregister(&drv->driver);
179 EXPORT_SYMBOL_GPL(soundbus_unregister_driver);
181 static int __init soundbus_init(void)
183 return bus_register(&soundbus_bus_type);
186 static void __exit soundbus_exit(void)
188 bus_unregister(&soundbus_bus_type);
191 subsys_initcall(soundbus_init);
192 module_exit(soundbus_exit);