1 /* 2 * soundbus 3 * 4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> 5 * 6 * GPL v2, can be found in COPYING. 7 */ 8 9 #include <linux/module.h> 10 #include "soundbus.h" 11 12 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); 13 MODULE_LICENSE("GPL"); 14 MODULE_DESCRIPTION("Apple Soundbus"); 15 16 struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev) 17 { 18 struct device *tmp; 19 20 if (!dev) 21 return NULL; 22 tmp = get_device(&dev->ofdev.dev); 23 if (tmp) 24 return to_soundbus_device(tmp); 25 else 26 return NULL; 27 } 28 EXPORT_SYMBOL_GPL(soundbus_dev_get); 29 30 void soundbus_dev_put(struct soundbus_dev *dev) 31 { 32 if (dev) 33 put_device(&dev->ofdev.dev); 34 } 35 EXPORT_SYMBOL_GPL(soundbus_dev_put); 36 37 static int soundbus_probe(struct device *dev) 38 { 39 int error = -ENODEV; 40 struct soundbus_driver *drv; 41 struct soundbus_dev *soundbus_dev; 42 43 drv = to_soundbus_driver(dev->driver); 44 soundbus_dev = to_soundbus_device(dev); 45 46 if (!drv->probe) 47 return error; 48 49 soundbus_dev_get(soundbus_dev); 50 51 error = drv->probe(soundbus_dev); 52 if (error) 53 soundbus_dev_put(soundbus_dev); 54 55 return error; 56 } 57 58 59 static int soundbus_uevent(struct device *dev, struct kobj_uevent_env *env) 60 { 61 struct soundbus_dev * soundbus_dev; 62 struct platform_device * of; 63 const char *compat; 64 int retval = 0; 65 int cplen, seen = 0; 66 67 if (!dev) 68 return -ENODEV; 69 70 soundbus_dev = to_soundbus_device(dev); 71 if (!soundbus_dev) 72 return -ENODEV; 73 74 of = &soundbus_dev->ofdev; 75 76 /* stuff we want to pass to /sbin/hotplug */ 77 retval = add_uevent_var(env, "OF_NAME=%pOFn", of->dev.of_node); 78 if (retval) 79 return retval; 80 81 retval = add_uevent_var(env, "OF_TYPE=%s", of_node_get_device_type(of->dev.of_node)); 82 if (retval) 83 return retval; 84 85 /* Since the compatible field can contain pretty much anything 86 * it's not really legal to split it out with commas. We split it 87 * up using a number of environment variables instead. */ 88 89 compat = of_get_property(of->dev.of_node, "compatible", &cplen); 90 while (compat && cplen > 0) { 91 int tmp = env->buflen; 92 retval = add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat); 93 if (retval) 94 return retval; 95 compat += env->buflen - tmp; 96 cplen -= env->buflen - tmp; 97 seen += 1; 98 } 99 100 retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); 101 if (retval) 102 return retval; 103 retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias); 104 105 return retval; 106 } 107 108 static int soundbus_device_remove(struct device *dev) 109 { 110 struct soundbus_dev * soundbus_dev = to_soundbus_device(dev); 111 struct soundbus_driver * drv = to_soundbus_driver(dev->driver); 112 113 if (dev->driver && drv->remove) 114 drv->remove(soundbus_dev); 115 soundbus_dev_put(soundbus_dev); 116 117 return 0; 118 } 119 120 static void soundbus_device_shutdown(struct device *dev) 121 { 122 struct soundbus_dev * soundbus_dev = to_soundbus_device(dev); 123 struct soundbus_driver * drv = to_soundbus_driver(dev->driver); 124 125 if (dev->driver && drv->shutdown) 126 drv->shutdown(soundbus_dev); 127 } 128 129 /* soundbus_dev_attrs is declared in sysfs.c */ 130 ATTRIBUTE_GROUPS(soundbus_dev); 131 static struct bus_type soundbus_bus_type = { 132 .name = "aoa-soundbus", 133 .probe = soundbus_probe, 134 .uevent = soundbus_uevent, 135 .remove = soundbus_device_remove, 136 .shutdown = soundbus_device_shutdown, 137 .dev_groups = soundbus_dev_groups, 138 }; 139 140 int soundbus_add_one(struct soundbus_dev *dev) 141 { 142 static int devcount; 143 144 /* sanity checks */ 145 if (!dev->attach_codec || 146 !dev->ofdev.dev.of_node || 147 dev->pcmname || 148 dev->pcmid != -1) { 149 printk(KERN_ERR "soundbus: adding device failed sanity check!\n"); 150 return -EINVAL; 151 } 152 153 dev_set_name(&dev->ofdev.dev, "soundbus:%x", ++devcount); 154 dev->ofdev.dev.bus = &soundbus_bus_type; 155 return of_device_register(&dev->ofdev); 156 } 157 EXPORT_SYMBOL_GPL(soundbus_add_one); 158 159 void soundbus_remove_one(struct soundbus_dev *dev) 160 { 161 of_device_unregister(&dev->ofdev); 162 } 163 EXPORT_SYMBOL_GPL(soundbus_remove_one); 164 165 int soundbus_register_driver(struct soundbus_driver *drv) 166 { 167 /* initialize common driver fields */ 168 drv->driver.name = drv->name; 169 drv->driver.bus = &soundbus_bus_type; 170 171 /* register with core */ 172 return driver_register(&drv->driver); 173 } 174 EXPORT_SYMBOL_GPL(soundbus_register_driver); 175 176 void soundbus_unregister_driver(struct soundbus_driver *drv) 177 { 178 driver_unregister(&drv->driver); 179 } 180 EXPORT_SYMBOL_GPL(soundbus_unregister_driver); 181 182 static int __init soundbus_init(void) 183 { 184 return bus_register(&soundbus_bus_type); 185 } 186 187 static void __exit soundbus_exit(void) 188 { 189 bus_unregister(&soundbus_bus_type); 190 } 191 192 subsys_initcall(soundbus_init); 193 module_exit(soundbus_exit); 194