| 1 |
|
| 2 | |
| 3 | * media-dev-allocator.h - Media Controller Device Allocator API
|
| 4 | *
|
| 5 | * Copyright (c) 2019 Shuah Khan <[email protected]>
|
| 6 | *
|
| 7 | * Credits: Suggested by Laurent Pinchart <[email protected]>
|
| 8 |
|
| 9 |
|
| 10 | |
| 11 | * This file adds a global ref-counted Media Controller Device Instance API.
|
| 12 | * A system wide global media device list is managed and each media device
|
| 13 | * includes a kref count. The last put on the media device releases the media
|
| 14 | * device instance.
|
| 15 |
|
| 16 |
|
| 17 | #ifndef _MEDIA_DEV_ALLOCATOR_H
|
| 18 | #define _MEDIA_DEV_ALLOCATOR_H
|
| 19 |
|
| 20 | struct usb_device;
|
| 21 |
|
| 22 | #if defined(CONFIG_MEDIA_CONTROLLER) && IS_ENABLED(CONFIG_USB)
|
| 23 | |
| 24 | * media_device_usb_allocate() - Allocate and return struct &media device
|
| 25 | *
|
| 26 | * @udev: struct &usb_device pointer
|
| 27 | * @module_name: should be filled with %KBUILD_MODNAME
|
| 28 | * @owner: struct module pointer %THIS_MODULE for the driver.
|
| 29 | * %THIS_MODULE is null for a built-in driver.
|
| 30 | * It is safe even when %THIS_MODULE is null.
|
| 31 | *
|
| 32 | * This interface should be called to allocate a Media Device when multiple
|
| 33 | * drivers share usb_device and the media device. This interface allocates
|
| 34 | * &media_device structure and calls media_device_usb_init() to initialize
|
| 35 | * it.
|
| 36 | *
|
| 37 |
|
| 38 | struct media_device *media_device_usb_allocate(struct usb_device *udev,
|
| 39 | const char *module_name,
|
| 40 | struct module *owner);
|
| 41 | |
| 42 | * media_device_delete() - Release media device. Calls kref_put().
|
| 43 | *
|
| 44 | * @mdev: struct &media_device pointer
|
| 45 | * @module_name: should be filled with %KBUILD_MODNAME
|
| 46 | * @owner: struct module pointer %THIS_MODULE for the driver.
|
| 47 | * %THIS_MODULE is null for a built-in driver.
|
| 48 | * It is safe even when %THIS_MODULE is null.
|
| 49 | *
|
| 50 | * This interface should be called to put Media Device Instance kref.
|
| 51 |
|
| 52 | void media_device_delete(struct media_device *mdev, const char *module_name,
|
| 53 | struct module *owner);
|
| 54 | #else
|
| 55 | static inline struct media_device *media_device_usb_allocate(
|
| 56 | struct usb_device *udev, const char *module_name,
|
| 57 | struct module *owner)
|
| 58 | { return NULL; }
|
| 59 | static inline void media_device_delete(
|
| 60 | struct media_device *mdev, const char *module_name,
|
| 61 | struct module *owner) { }
|
| 62 | #endif
|
| 63 | #endif
|