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device: added register_class_devname() API

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this allows drivers to register generic device names for a device
class, with automatic class instance handling
This commit is contained in:
Andrew Tridgell
2013-12-07 22:43:54 +11:00
committed by Lorenz Meier
parent 895dc3a2bb
commit b2b9665e44
2 changed files with 58 additions and 0 deletions
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src/drivers/device/cdev.cpp
+36
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@@ -108,6 +108,42 @@ CDev::~CDev()
unregister_driver(_devname);
}
int
CDev::register_class_devname(const char *class_devname)
{
if (class_devname == nullptr) {
return -EINVAL;
}
int class_instance = 0;
int ret = -ENOSPC;
while (class_instance < 4) {
if (class_instance == 0) {
ret = register_driver(class_devname, &fops, 0666, (void *)this);
if (ret == OK) break;
} else {
char name[32];
snprintf(name, sizeof(name), "%s%u", class_devname, class_instance);
ret = register_driver(name, &fops, 0666, (void *)this);
if (ret == OK) break;
}
class_instance++;
}
if (class_instance == 4)
return ret;
return class_instance;
}
int
CDev::unregister_class_devname(const char *class_devname, unsigned class_instance)
{
if (class_instance > 0) {
char name[32];
snprintf(name, sizeof(name), "%s%u", class_devname, class_instance);
return unregister_driver(name);
}
return unregister_driver(class_devname);
}
int
CDev::init()
{