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 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 58 static int soundbus_uevent(struct device *dev, struct kobj_uevent_env *env) 59 { 60 struct soundbus_dev * soundbus_dev; 61 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 } 106 107 static int 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 return 0; 117 } 118 119 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 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 }; 138 139 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); 157 158 void soundbus_remove_one(struct soundbus_dev *dev) 159 { 160 of_device_unregister(&dev->ofdev); 161 } 162 EXPORT_SYMBOL_GPL(soundbus_remove_one); 163 164 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); 174 175 void soundbus_unregister_driver(struct soundbus_driver *drv) 176 { 177 driver_unregister(&drv->driver); 178 } 179 EXPORT_SYMBOL_GPL(soundbus_unregister_driver); 180 181 static int __init soundbus_init(void) 182 { 183 return bus_register(&soundbus_bus_type); 184 } 185 186 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