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 <linux/of.h>
10 #include <linux/of_platform.h>
11 #include "soundbus.h"
12
13 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
14 MODULE_LICENSE("GPL");
15 MODULE_DESCRIPTION("Apple Soundbus");
16
soundbus_dev_get(struct soundbus_dev * dev)17 struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev)
18 {
19 struct device *tmp;
20
21 if (!dev)
22 return NULL;
23 tmp = get_device(&dev->ofdev.dev);
24 if (tmp)
25 return to_soundbus_device(tmp);
26 else
27 return NULL;
28 }
29 EXPORT_SYMBOL_GPL(soundbus_dev_get);
30
soundbus_dev_put(struct soundbus_dev * dev)31 void soundbus_dev_put(struct soundbus_dev *dev)
32 {
33 if (dev)
34 put_device(&dev->ofdev.dev);
35 }
36 EXPORT_SYMBOL_GPL(soundbus_dev_put);
37
soundbus_probe(struct device * dev)38 static int soundbus_probe(struct device *dev)
39 {
40 int error = -ENODEV;
41 struct soundbus_driver *drv;
42 struct soundbus_dev *soundbus_dev;
43
44 drv = to_soundbus_driver(dev->driver);
45 soundbus_dev = to_soundbus_device(dev);
46
47 if (!drv->probe)
48 return error;
49
50 soundbus_dev_get(soundbus_dev);
51
52 error = drv->probe(soundbus_dev);
53 if (error)
54 soundbus_dev_put(soundbus_dev);
55
56 return error;
57 }
58
59
soundbus_uevent(const struct device * dev,struct kobj_uevent_env * env)60 static int soundbus_uevent(const struct device *dev, struct kobj_uevent_env *env)
61 {
62 const struct soundbus_dev * soundbus_dev;
63 const struct platform_device * of;
64 const char *compat;
65 int retval = 0;
66 int cplen, seen = 0;
67
68 if (!dev)
69 return -ENODEV;
70
71 soundbus_dev = to_soundbus_device(dev);
72 if (!soundbus_dev)
73 return -ENODEV;
74
75 of = &soundbus_dev->ofdev;
76
77 /* stuff we want to pass to /sbin/hotplug */
78 retval = add_uevent_var(env, "OF_NAME=%pOFn", of->dev.of_node);
79 if (retval)
80 return retval;
81
82 retval = add_uevent_var(env, "OF_TYPE=%s", of_node_get_device_type(of->dev.of_node));
83 if (retval)
84 return retval;
85
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. */
89
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);
94 if (retval)
95 return retval;
96 compat += env->buflen - tmp;
97 cplen -= env->buflen - tmp;
98 seen += 1;
99 }
100
101 retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
102 if (retval)
103 return retval;
104 retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias);
105
106 return retval;
107 }
108
soundbus_device_remove(struct device * dev)109 static void soundbus_device_remove(struct device *dev)
110 {
111 struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
112 struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
113
114 if (dev->driver && drv->remove)
115 drv->remove(soundbus_dev);
116 soundbus_dev_put(soundbus_dev);
117 }
118
soundbus_device_shutdown(struct device * dev)119 static void soundbus_device_shutdown(struct device *dev)
120 {
121 struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
122 struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
123
124 if (dev->driver && drv->shutdown)
125 drv->shutdown(soundbus_dev);
126 }
127
128 /* soundbus_dev_attrs is declared in sysfs.c */
129 ATTRIBUTE_GROUPS(soundbus_dev);
130 static const 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,
137 };
138
soundbus_add_one(struct soundbus_dev * dev)139 int soundbus_add_one(struct soundbus_dev *dev)
140 {
141 static int devcount;
142
143 /* sanity checks */
144 if (!dev->attach_codec ||
145 !dev->ofdev.dev.of_node ||
146 dev->pcmname ||
147 dev->pcmid != -1) {
148 printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
149 return -EINVAL;
150 }
151
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);
155 }
156 EXPORT_SYMBOL_GPL(soundbus_add_one);
157
soundbus_remove_one(struct soundbus_dev * dev)158 void soundbus_remove_one(struct soundbus_dev *dev)
159 {
160 of_device_unregister(&dev->ofdev);
161 }
162 EXPORT_SYMBOL_GPL(soundbus_remove_one);
163
soundbus_register_driver(struct soundbus_driver * drv)164 int soundbus_register_driver(struct soundbus_driver *drv)
165 {
166 /* initialize common driver fields */
167 drv->driver.name = drv->name;
168 drv->driver.bus = &soundbus_bus_type;
169
170 /* register with core */
171 return driver_register(&drv->driver);
172 }
173 EXPORT_SYMBOL_GPL(soundbus_register_driver);
174
soundbus_unregister_driver(struct soundbus_driver * drv)175 void soundbus_unregister_driver(struct soundbus_driver *drv)
176 {
177 driver_unregister(&drv->driver);
178 }
179 EXPORT_SYMBOL_GPL(soundbus_unregister_driver);
180
soundbus_init(void)181 static int __init soundbus_init(void)
182 {
183 return bus_register(&soundbus_bus_type);
184 }
185
soundbus_exit(void)186 static void __exit soundbus_exit(void)
187 {
188 bus_unregister(&soundbus_bus_type);
189 }
190
191 subsys_initcall(soundbus_init);
192 module_exit(soundbus_exit);
193