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/*
* soundbus
*
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
*
* GPL v2, can be found in COPYING.
*/
#include <linux/module.h>
#include "soundbus.h"
MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Apple Soundbus");
struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev)
{
struct device *tmp;
if (!dev)
return NULL;
tmp = get_device(&dev->ofdev.dev);
if (tmp)
return to_soundbus_device(tmp);
else
return NULL;
}
EXPORT_SYMBOL_GPL(soundbus_dev_get);
void soundbus_dev_put(struct soundbus_dev *dev)
{
if (dev)
put_device(&dev->ofdev.dev);
}
EXPORT_SYMBOL_GPL(soundbus_dev_put);
static int soundbus_probe(struct device *dev)
{
int error = -ENODEV;
struct soundbus_driver *drv;
struct soundbus_dev *soundbus_dev;
drv = to_soundbus_driver(dev->driver);
soundbus_dev = to_soundbus_device(dev);
if (!drv->probe)
return error;
soundbus_dev_get(soundbus_dev);
error = drv->probe(soundbus_dev);
if (error)
soundbus_dev_put(soundbus_dev);
return error;
}
static int soundbus_uevent(struct device *dev, char **envp, int num_envp,
char *buffer, int buffer_size)
{
struct soundbus_dev * soundbus_dev;
struct of_device * of;
char *scratch;
const char *compat;
int i = 0;
int length, cplen, seen = 0;
if (!dev)
return -ENODEV;
soundbus_dev = to_soundbus_device(dev);
if (!soundbus_dev)
return -ENODEV;
of = &soundbus_dev->ofdev;
/* stuff we want to pass to /sbin/hotplug */
envp[i++] = scratch = buffer;
length = scnprintf (scratch, buffer_size, "OF_NAME=%s", of->node->name);
++length;
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
scratch += length;
envp[i++] = scratch;
length = scnprintf (scratch, buffer_size, "OF_TYPE=%s", of->node->type);
++length;
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
scratch += length;
/* Since the compatible field can contain pretty much anything
* it's not really legal to split it out with commas. We split it
* up using a number of environment variables instead. */
compat = of_get_property(of->node, "compatible", &cplen);
while (compat && cplen > 0) {
envp[i++] = scratch;
length = scnprintf (scratch, buffer_size,
"OF_COMPATIBLE_%d=%s", seen, compat);
++length;
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
scratch += length;
length = strlen (compat) + 1;
compat += length;
cplen -= length;
seen++;
}
envp[i++] = scratch;
length = scnprintf (scratch, buffer_size, "OF_COMPATIBLE_N=%d", seen);
++length;
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
scratch += length;
envp[i++] = scratch;
length = scnprintf (scratch, buffer_size, "MODALIAS=%s",
soundbus_dev->modalias);
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
envp[i] = NULL;
return 0;
}
static int soundbus_device_remove(struct device *dev)
{
struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
if (dev->driver && drv->remove)
drv->remove(soundbus_dev);
soundbus_dev_put(soundbus_dev);
return 0;
}
static void soundbus_device_shutdown(struct device *dev)
{
struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
if (dev->driver && drv->shutdown)
drv->shutdown(soundbus_dev);
}
#ifdef CONFIG_PM
static int soundbus_device_suspend(struct device *dev, pm_message_t state)
{
struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
if (dev->driver && drv->suspend)
return drv->suspend(soundbus_dev, state);
return 0;
}
static int soundbus_device_resume(struct device * dev)
{
struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
if (dev->driver && drv->resume)
return drv->resume(soundbus_dev);
return 0;
}
#endif /* CONFIG_PM */
extern struct device_attribute soundbus_dev_attrs[];
static struct bus_type soundbus_bus_type = {
.name = "aoa-soundbus",
.probe = soundbus_probe,
.uevent = soundbus_uevent,
.remove = soundbus_device_remove,
.shutdown = soundbus_device_shutdown,
#ifdef CONFIG_PM
.suspend = soundbus_device_suspend,
.resume = soundbus_device_resume,
#endif
.dev_attrs = soundbus_dev_attrs,
};
int soundbus_add_one(struct soundbus_dev *dev)
{
static int devcount;
/* sanity checks */
if (!dev->attach_codec ||
!dev->ofdev.node ||
dev->pcmname ||
dev->pcmid != -1) {
printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
return -EINVAL;
}
snprintf(dev->ofdev.dev.bus_id, BUS_ID_SIZE, "soundbus:%x", ++devcount);
dev->ofdev.dev.bus = &soundbus_bus_type;
return of_device_register(&dev->ofdev);
}
EXPORT_SYMBOL_GPL(soundbus_add_one);
void soundbus_remove_one(struct soundbus_dev *dev)
{
of_device_unregister(&dev->ofdev);
}
EXPORT_SYMBOL_GPL(soundbus_remove_one);
int soundbus_register_driver(struct soundbus_driver *drv)
{
/* initialize common driver fields */
drv->driver.name = drv->name;
drv->driver.bus = &soundbus_bus_type;
/* register with core */
return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(soundbus_register_driver);
void soundbus_unregister_driver(struct soundbus_driver *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(soundbus_unregister_driver);
static int __init soundbus_init(void)
{
return bus_register(&soundbus_bus_type);
}
static void __exit soundbus_exit(void)
{
bus_unregister(&soundbus_bus_type);
}
subsys_initcall(soundbus_init);
module_exit(soundbus_exit);
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