summaryrefslogtreecommitdiffstats
path: root/include/media/media-device.h
blob: c21b4c5f587192ce206689bf083a3552e10060e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
/*
 * Media device
 *
 * Copyright (C) 2010 Nokia Corporation
 *
 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *	     Sakari Ailus <sakari.ailus@iki.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _MEDIA_DEVICE_H
#define _MEDIA_DEVICE_H

#include <linux/list.h>
#include <linux/mutex.h>

#include <media/media-devnode.h>
#include <media/media-entity.h>

struct ida;
struct device;

/**
 * struct media_entity_notify - Media Entity Notify
 *
 * @list: List head
 * @notify_data: Input data to invoke the callback
 * @notify: Callback function pointer
 *
 * Drivers may register a callback to take action when new entities get
 * registered with the media device. This handler is intended for creating
 * links between existing entities and should not create entities and register
 * them.
 */
struct media_entity_notify {
	struct list_head list;
	void *notify_data;
	void (*notify)(struct media_entity *entity, void *notify_data);
};

/**
 * struct media_device_ops - Media device operations
 * @link_notify: Link state change notification callback. This callback is
 *		 called with the graph_mutex held.
 */
struct media_device_ops {
	int (*link_notify)(struct media_link *link, u32 flags,
			   unsigned int notification);
};

/**
 * struct media_device - Media device
 * @dev:	Parent device
 * @devnode:	Media device node
 * @driver_name: Optional device driver name. If not set, calls to
 *		%MEDIA_IOC_DEVICE_INFO will return ``dev->driver->name``.
 *		This is needed for USB drivers for example, as otherwise
 *		they'll all appear as if the driver name was "usb".
 * @model:	Device model name
 * @serial:	Device serial number (optional)
 * @bus_info:	Unique and stable device location identifier
 * @hw_revision: Hardware device revision
 * @driver_version: Device driver version
 * @topology_version: Monotonic counter for storing the version of the graph
 *		topology. Should be incremented each time the topology changes.
 * @id:		Unique ID used on the last registered graph object
 * @entity_internal_idx: Unique internal entity ID used by the graph traversal
 *		algorithms
 * @entity_internal_idx_max: Allocated internal entity indices
 * @entities:	List of registered entities
 * @interfaces:	List of registered interfaces
 * @pads:	List of registered pads
 * @links:	List of registered links
 * @entity_notify: List of registered entity_notify callbacks
 * @graph_mutex: Protects access to struct media_device data
 * @pm_count_walk: Graph walk for power state walk. Access serialised using
 *		   graph_mutex.
 *
 * @source_priv: Driver Private data for enable/disable source handlers
 * @enable_source: Enable Source Handler function pointer
 * @disable_source: Disable Source Handler function pointer
 *
 * @ops:	Operation handler callbacks
 *
 * This structure represents an abstract high-level media device. It allows easy
 * access to entities and provides basic media device-level support. The
 * structure can be allocated directly or embedded in a larger structure.
 *
 * The parent @dev is a physical device. It must be set before registering the
 * media device.
 *
 * @model is a descriptive model name exported through sysfs. It doesn't have to
 * be unique.
 *
 * @enable_source is a handler to find source entity for the
 * sink entity  and activate the link between them if source
 * entity is free. Drivers should call this handler before
 * accessing the source.
 *
 * @disable_source is a handler to find source entity for the
 * sink entity  and deactivate the link between them. Drivers
 * should call this handler to release the source.
 *
 * Use-case: find tuner entity connected to the decoder
 * entity and check if it is available, and activate the
 * the link between them from @enable_source and deactivate
 * from @disable_source.
 *
 * .. note::
 *
 *    Bridge driver is expected to implement and set the
 *    handler when &media_device is registered or when
 *    bridge driver finds the media_device during probe.
 *    Bridge driver sets source_priv with information
 *    necessary to run @enable_source and @disable_source handlers.
 */
struct media_device {
	/* dev->driver_data points to this struct. */
	struct device *dev;
	struct media_devnode *devnode;

	char model[32];
	char driver_name[32];
	char serial[40];
	char bus_info[32];
	u32 hw_revision;
	u32 driver_version;

	u64 topology_version;

	u32 id;
	struct ida entity_internal_idx;
	int entity_internal_idx_max;

	struct list_head entities;
	struct list_head interfaces;
	struct list_head pads;
	struct list_head links;

	/* notify callback list invoked when a new entity is registered */
	struct list_head entity_notify;

	/* Serializes graph operations. */
	struct mutex graph_mutex;
	struct media_entity_graph pm_count_walk;

	void *source_priv;
	int (*enable_source)(struct media_entity *entity,
			     struct media_pipeline *pipe);
	void (*disable_source)(struct media_entity *entity);

	const struct media_device_ops *ops;
};

/* We don't need to include pci.h or usb.h here */
struct pci_dev;
struct usb_device;

#ifdef CONFIG_MEDIA_CONTROLLER

/* Supported link_notify @notification values. */
#define MEDIA_DEV_NOTIFY_PRE_LINK_CH	0
#define MEDIA_DEV_NOTIFY_POST_LINK_CH	1

/**
 * media_entity_enum_init - Initialise an entity enumeration
 *
 * @ent_enum: Entity enumeration to be initialised
 * @mdev: The related media device
 *
 * Return: zero on success or a negative error code.
 */
static inline __must_check int media_entity_enum_init(
	struct media_entity_enum *ent_enum, struct media_device *mdev)
{
	return __media_entity_enum_init(ent_enum,
					mdev->entity_internal_idx_max + 1);
}

/**
 * media_device_init() - Initializes a media device element
 *
 * @mdev:	pointer to struct &media_device
 *
 * This function initializes the media device prior to its registration.
 * The media device initialization and registration is split in two functions
 * to avoid race conditions and make the media device available to user-space
 * before the media graph has been completed.
 *
 * So drivers need to first initialize the media device, register any entity
 * within the media device, create pad to pad links and then finally register
 * the media device by calling media_device_register() as a final step.
 */
void media_device_init(struct media_device *mdev);

/**
 * media_device_cleanup() - Cleanups a media device element
 *
 * @mdev:	pointer to struct &media_device
 *
 * This function that will destroy the graph_mutex that is
 * initialized in media_device_init().
 */
void media_device_cleanup(struct media_device *mdev);

/**
 * __media_device_register() - Registers a media device element
 *
 * @mdev:	pointer to struct &media_device
 * @owner:	should be filled with %THIS_MODULE
 *
 * Users, should, instead, call the media_device_register() macro.
 *
 * The caller is responsible for initializing the &media_device structure
 * before registration. The following fields of &media_device must be set:
 *
 *  - &media_entity.dev must point to the parent device (usually a &pci_dev,
 *    &usb_interface or &platform_device instance).
 *
 *  - &media_entity.model must be filled with the device model name as a
 *    NUL-terminated UTF-8 string. The device/model revision must not be
 *    stored in this field.
 *
 * The following fields are optional:
 *
 *  - &media_entity.serial is a unique serial number stored as a
 *    NUL-terminated ASCII string. The field is big enough to store a GUID
 *    in text form. If the hardware doesn't provide a unique serial number
 *    this field must be left empty.
 *
 *  - &media_entity.bus_info represents the location of the device in the
 *    system as a NUL-terminated ASCII string. For PCI/PCIe devices
 *    &media_entity.bus_info must be set to "PCI:" (or "PCIe:") followed by
 *    the value of pci_name(). For USB devices,the usb_make_path() function
 *    must be used. This field is used by applications to distinguish between
 *    otherwise identical devices that don't provide a serial number.
 *
 *  - &media_entity.hw_revision is the hardware device revision in a
 *    driver-specific format. When possible the revision should be formatted
 *    with the KERNEL_VERSION() macro.
 *
 *  - &media_entity.driver_version is formatted with the KERNEL_VERSION()
 *    macro. The version minor must be incremented when new features are added
 *    to the userspace API without breaking binary compatibility. The version
 *    major must be incremented when binary compatibility is broken.
 *
 * .. note::
 *
 *    #) Upon successful registration a character device named media[0-9]+ is created. The device major and minor numbers are dynamic. The model name is exported as a sysfs attribute.
 *
 *    #) Unregistering a media device that hasn't been registered is **NOT** safe.
 *
 * Return: returns zero on success or a negative error code.
 */
int __must_check __media_device_register(struct media_device *mdev,
					 struct module *owner);


/**
 * media_device_register() - Registers a media device element
 *
 * @mdev:	pointer to struct &media_device
 *
 * This macro calls __media_device_register() passing %THIS_MODULE as
 * the __media_device_register() second argument (**owner**).
 */
#define media_device_register(mdev) __media_device_register(mdev, THIS_MODULE)

/**
 * media_device_unregister() - Unregisters a media device element
 *
 * @mdev:	pointer to struct &media_device
 *
 * It is safe to call this function on an unregistered (but initialised)
 * media device.
 */
void media_device_unregister(struct media_device *mdev);

/**
 * media_device_register_entity() - registers a media entity inside a
 *	previously registered media device.
 *
 * @mdev:	pointer to struct &media_device
 * @entity:	pointer to struct &media_entity to be registered
 *
 * Entities are identified by a unique positive integer ID. The media
 * controller framework will such ID automatically. IDs are not guaranteed
 * to be contiguous, and the ID number can change on newer Kernel versions.
 * So, neither the driver nor userspace should hardcode ID numbers to refer
 * to the entities, but, instead, use the framework to find the ID, when
 * needed.
 *
 * The media_entity name, type and flags fields should be initialized before
 * calling media_device_register_entity(). Entities embedded in higher-level
 * standard structures can have some of those fields set by the higher-level
 * framework.
 *
 * If the device has pads, media_entity_pads_init() should be called before
 * this function. Otherwise, the &media_entity.pad and &media_entity.num_pads
 * should be zeroed before calling this function.
 *
 * Entities have flags that describe the entity capabilities and state:
 *
 * %MEDIA_ENT_FL_DEFAULT
 *    indicates the default entity for a given type.
 *    This can be used to report the default audio and video devices or the
 *    default camera sensor.
 *
 * .. note::
 *
 *    Drivers should set the entity function before calling this function.
 *    Please notice that the values %MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN and
 *    %MEDIA_ENT_F_UNKNOWN should not be used by the drivers.
 */
int __must_check media_device_register_entity(struct media_device *mdev,
					      struct media_entity *entity);

/**
 * media_device_unregister_entity() - unregisters a media entity.
 *
 * @entity:	pointer to struct &media_entity to be unregistered
 *
 * All links associated with the entity and all PADs are automatically
 * unregistered from the media_device when this function is called.
 *
 * Unregistering an entity will not change the IDs of the other entities and
 * the previoully used ID will never be reused for a newly registered entities.
 *
 * When a media device is unregistered, all its entities are unregistered
 * automatically. No manual entities unregistration is then required.
 *
 * .. note::
 *
 *    The media_entity instance itself must be freed explicitly by
 *    the driver if required.
 */
void media_device_unregister_entity(struct media_entity *entity);

/**
 * media_device_register_entity_notify() - Registers a media entity_notify
 *					   callback
 *
 * @mdev:      The media device
 * @nptr:      The media_entity_notify
 *
 * .. note::
 *
 *    When a new entity is registered, all the registered
 *    media_entity_notify callbacks are invoked.
 */

int __must_check media_device_register_entity_notify(struct media_device *mdev,
					struct media_entity_notify *nptr);

/**
 * media_device_unregister_entity_notify() - Unregister a media entity notify
 *					     callback
 *
 * @mdev:      The media device
 * @nptr:      The media_entity_notify
 *
 */
void media_device_unregister_entity_notify(struct media_device *mdev,
					struct media_entity_notify *nptr);

/* Iterate over all entities. */
#define media_device_for_each_entity(entity, mdev)			\
	list_for_each_entry(entity, &(mdev)->entities, graph_obj.list)

/* Iterate over all interfaces. */
#define media_device_for_each_intf(intf, mdev)			\
	list_for_each_entry(intf, &(mdev)->interfaces, graph_obj.list)

/* Iterate over all pads. */
#define media_device_for_each_pad(pad, mdev)			\
	list_for_each_entry(pad, &(mdev)->pads, graph_obj.list)

/* Iterate over all links. */
#define media_device_for_each_link(link, mdev)			\
	list_for_each_entry(link, &(mdev)->links, graph_obj.list)

/**
 * media_device_pci_init() - create and initialize a
 *	struct &media_device from a PCI device.
 *
 * @mdev:	pointer to struct &media_device
 * @pci_dev:	pointer to struct pci_dev
 * @name:	media device name. If %NULL, the routine will use the default
 *		name for the pci device, given by pci_name() macro.
 */
void media_device_pci_init(struct media_device *mdev,
			   struct pci_dev *pci_dev,
			   const char *name);
/**
 * __media_device_usb_init() - create and initialize a
 *	struct &media_device from a PCI device.
 *
 * @mdev:	pointer to struct &media_device
 * @udev:	pointer to struct usb_device
 * @board_name:	media device name. If %NULL, the routine will use the usb
 *		product name, if available.
 * @driver_name: name of the driver. if %NULL, the routine will use the name
 *		given by ``udev->dev->driver->name``, with is usually the wrong
 *		thing to do.
 *
 * .. note::
 *
 *    It is better to call media_device_usb_init() instead, as
 *    such macro fills driver_name with %KBUILD_MODNAME.
 */
void __media_device_usb_init(struct media_device *mdev,
			     struct usb_device *udev,
			     const char *board_name,
			     const char *driver_name);

#else
static inline int media_device_register(struct media_device *mdev)
{
	return 0;
}
static inline void media_device_unregister(struct media_device *mdev)
{
}
static inline int media_device_register_entity(struct media_device *mdev,
						struct media_entity *entity)
{
	return 0;
}
static inline void media_device_unregister_entity(struct media_entity *entity)
{
}
static inline int media_device_register_entity_notify(
					struct media_device *mdev,
					struct media_entity_notify *nptr)
{
	return 0;
}
static inline void media_device_unregister_entity_notify(
					struct media_device *mdev,
					struct media_entity_notify *nptr)
{
}

static inline void media_device_pci_init(struct media_device *mdev,
					 struct pci_dev *pci_dev,
					 char *name)
{
}

static inline void __media_device_usb_init(struct media_device *mdev,
					   struct usb_device *udev,
					   char *board_name,
					   char *driver_name)
{
}

#endif /* CONFIG_MEDIA_CONTROLLER */

/**
 * media_device_usb_init() - create and initialize a
 *	struct &media_device from a PCI device.
 *
 * @mdev:	pointer to struct &media_device
 * @udev:	pointer to struct usb_device
 * @name:	media device name. If %NULL, the routine will use the usb
 *		product name, if available.
 *
 * This macro calls media_device_usb_init() passing the
 * media_device_usb_init() **driver_name** parameter filled with
 * %KBUILD_MODNAME.
 */
#define media_device_usb_init(mdev, udev, name) \
	__media_device_usb_init(mdev, udev, name, KBUILD_MODNAME)

#endif
OpenPOWER on IntegriCloud