![Greg Kroah-Hartman](/assets/img/avatar_default.png)
It's good to have SPDX identifiers in all files to make it easier to audit the kernel tree for correct licenses. Update the drivers/usb/ and include/linux/usb* files with the correct SPDX license identifier based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Thomas Gleixner, Philippe Ombredanne, and Kate Stewart. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Acked-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
118 lines
2.3 KiB
C
118 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/err.h>
|
|
|
|
#include <linux/usb/composite.h>
|
|
|
|
static LIST_HEAD(func_list);
|
|
static DEFINE_MUTEX(func_lock);
|
|
|
|
static struct usb_function_instance *try_get_usb_function_instance(const char *name)
|
|
{
|
|
struct usb_function_driver *fd;
|
|
struct usb_function_instance *fi;
|
|
|
|
fi = ERR_PTR(-ENOENT);
|
|
mutex_lock(&func_lock);
|
|
list_for_each_entry(fd, &func_list, list) {
|
|
|
|
if (strcmp(name, fd->name))
|
|
continue;
|
|
|
|
if (!try_module_get(fd->mod)) {
|
|
fi = ERR_PTR(-EBUSY);
|
|
break;
|
|
}
|
|
fi = fd->alloc_inst();
|
|
if (IS_ERR(fi))
|
|
module_put(fd->mod);
|
|
else
|
|
fi->fd = fd;
|
|
break;
|
|
}
|
|
mutex_unlock(&func_lock);
|
|
return fi;
|
|
}
|
|
|
|
struct usb_function_instance *usb_get_function_instance(const char *name)
|
|
{
|
|
struct usb_function_instance *fi;
|
|
int ret;
|
|
|
|
fi = try_get_usb_function_instance(name);
|
|
if (!IS_ERR(fi))
|
|
return fi;
|
|
ret = PTR_ERR(fi);
|
|
if (ret != -ENOENT)
|
|
return fi;
|
|
ret = request_module("usbfunc:%s", name);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
return try_get_usb_function_instance(name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_get_function_instance);
|
|
|
|
struct usb_function *usb_get_function(struct usb_function_instance *fi)
|
|
{
|
|
struct usb_function *f;
|
|
|
|
f = fi->fd->alloc_func(fi);
|
|
if (IS_ERR(f))
|
|
return f;
|
|
f->fi = fi;
|
|
return f;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_get_function);
|
|
|
|
void usb_put_function_instance(struct usb_function_instance *fi)
|
|
{
|
|
struct module *mod;
|
|
|
|
if (!fi)
|
|
return;
|
|
|
|
mod = fi->fd->mod;
|
|
fi->free_func_inst(fi);
|
|
module_put(mod);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_put_function_instance);
|
|
|
|
void usb_put_function(struct usb_function *f)
|
|
{
|
|
if (!f)
|
|
return;
|
|
|
|
f->free_func(f);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_put_function);
|
|
|
|
int usb_function_register(struct usb_function_driver *newf)
|
|
{
|
|
struct usb_function_driver *fd;
|
|
int ret;
|
|
|
|
ret = -EEXIST;
|
|
|
|
mutex_lock(&func_lock);
|
|
list_for_each_entry(fd, &func_list, list) {
|
|
if (!strcmp(fd->name, newf->name))
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
list_add_tail(&newf->list, &func_list);
|
|
out:
|
|
mutex_unlock(&func_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_function_register);
|
|
|
|
void usb_function_unregister(struct usb_function_driver *fd)
|
|
{
|
|
mutex_lock(&func_lock);
|
|
list_del(&fd->list);
|
|
mutex_unlock(&func_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_function_unregister);
|