aboutsummaryrefslogtreecommitdiff
path: root/include/media/dvbdev.h
blob: ee91516ad07491a8e1ee37b8917e8ab33b945530 (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
/*
 * dvbdev.h
 *
 * Copyright (C) 2000 Ralph Metzler & Marcus Metzler
 *                    for convergence integrated media GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Lesser Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * 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.
 *
 */

#ifndef _DVBDEV_H_
#define _DVBDEV_H_

#include <linux/types.h>
#include <linux/poll.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <media/media-device.h>

#define DVB_MAJOR 212

#if defined(CONFIG_DVB_MAX_ADAPTERS) && CONFIG_DVB_MAX_ADAPTERS > 0
  #define DVB_MAX_ADAPTERS CONFIG_DVB_MAX_ADAPTERS
#else
  #define DVB_MAX_ADAPTERS 16
#endif

#define DVB_UNSET (-1)

/* List of DVB device types */

/**
 * enum dvb_device_type - type of the Digital TV device
 *
 * @DVB_DEVICE_SEC:		Digital TV standalone Common Interface (CI)
 * @DVB_DEVICE_FRONTEND:	Digital TV frontend.
 * @DVB_DEVICE_DEMUX:		Digital TV demux.
 * @DVB_DEVICE_DVR:		Digital TV digital video record (DVR).
 * @DVB_DEVICE_CA:		Digital TV Conditional Access (CA).
 * @DVB_DEVICE_NET:		Digital TV network.
 *
 * @DVB_DEVICE_VIDEO:		Digital TV video decoder.
 *				Deprecated. Used only on av7110-av.
 * @DVB_DEVICE_AUDIO:		Digital TV audio decoder.
 *				Deprecated. Used only on av7110-av.
 * @DVB_DEVICE_OSD:		Digital TV On Screen Display (OSD).
 *				Deprecated. Used only on av7110.
 */
enum dvb_device_type {
	DVB_DEVICE_SEC,
	DVB_DEVICE_FRONTEND,
	DVB_DEVICE_DEMUX,
	DVB_DEVICE_DVR,
	DVB_DEVICE_CA,
	DVB_DEVICE_NET,

	DVB_DEVICE_VIDEO,
	DVB_DEVICE_AUDIO,
	DVB_DEVICE_OSD,
};

#define DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr) \
	static short adapter_nr[] = \
		{[0 ... (DVB_MAX_ADAPTERS - 1)] = DVB_UNSET }; \
	module_param_array(adapter_nr, short, NULL, 0444); \
	MODULE_PARM_DESC(adapter_nr, "DVB adapter numbers")

struct dvb_frontend;

/**
 * struct dvb_adapter - represents a Digital TV adapter using Linux DVB API
 *
 * @num:		Number of the adapter
 * @list_head:		List with the DVB adapters
 * @device_list:	List with the DVB devices
 * @name:		Name of the adapter
 * @proposed_mac:	proposed MAC address for the adapter
 * @priv:		private data
 * @device:		pointer to struct device
 * @module:		pointer to struct module
 * @mfe_shared:		mfe shared: indicates mutually exclusive frontends
 *			Thie usage of this flag is currently deprecated
 * @mfe_dvbdev:		Frontend device in use, in the case of MFE
 * @mfe_lock:		Lock to prevent using the other frontends when MFE is
 *			used.
 * @mdev:		pointer to struct media_device, used when the media
 *			controller is used.
 * @conn:		RF connector. Used only if the device has no separate
 *			tuner.
 * @conn_pads:		pointer to struct media_pad associated with @conn;
 */
struct dvb_adapter {
	int num;
	struct list_head list_head;
	struct list_head device_list;
	const char *name;
	u8 proposed_mac [6];
	void* priv;

	struct device *device;

	struct module *module;

	int mfe_shared;			/* indicates mutually exclusive frontends */
	struct dvb_device *mfe_dvbdev;	/* frontend device in use */
	struct mutex mfe_lock;		/* access lock for thread creation */

#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	struct media_device *mdev;
	struct media_entity *conn;
	struct media_pad *conn_pads;
#endif
};

/**
 * struct dvb_device - represents a DVB device node
 *
 * @list_head:	List head with all DVB devices
 * @fops:	pointer to struct file_operations
 * @adapter:	pointer to the adapter that holds this device node
 * @type:	type of the device, as defined by &enum dvb_device_type.
 * @minor:	devnode minor number. Major number is always DVB_MAJOR.
 * @id:		device ID number, inside the adapter
 * @readers:	Initialized by the caller. Each call to open() in Read Only mode
 *		decreases this counter by one.
 * @writers:	Initialized by the caller. Each call to open() in Read/Write
 *		mode decreases this counter by one.
 * @users:	Initialized by the caller. Each call to open() in any mode
 *		decreases this counter by one.
 * @wait_queue:	wait queue, used to wait for certain events inside one of
 *		the DVB API callers
 * @kernel_ioctl: callback function used to handle ioctl calls from userspace.
 * @name:	Name to be used for the device at the Media Controller
 * @entity:	pointer to struct media_entity associated with the device node
 * @pads:	pointer to struct media_pad associated with @entity;
 * @priv:	private data
 * @intf_devnode: Pointer to media_intf_devnode. Used by the dvbdev core to
 *		store the MC device node interface
 * @tsout_num_entities: Number of Transport Stream output entities
 * @tsout_entity: array with MC entities associated to each TS output node
 * @tsout_pads: array with the source pads for each @tsout_entity
 *
 * This structure is used by the DVB core (frontend, CA, net, demux) in
 * order to create the device nodes. Usually, driver should not initialize
 * this struct diretly.
 */
struct dvb_device {
	struct list_head list_head;
	const struct file_operations *fops;
	struct dvb_adapter *adapter;
	enum dvb_device_type type;
	int minor;
	u32 id;

	/* in theory, 'users' can vanish now,
	   but I don't want to change too much now... */
	int readers;
	int writers;
	int users;

	wait_queue_head_t	  wait_queue;
	/* don't really need those !? -- FIXME: use video_usercopy  */
	int (*kernel_ioctl)(struct file *file, unsigned int cmd, void *arg);

	/* Needed for media controller register/unregister */
#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	const char *name;

	/* Allocated and filled inside dvbdev.c */
	struct media_intf_devnode *intf_devnode;

	unsigned tsout_num_entities;
	struct media_entity *entity, *tsout_entity;
	struct media_pad *pads, *tsout_pads;
#endif

	void *priv;
};

/**
 * dvb_register_adapter - Registers a new DVB adapter
 *
 * @adap:	pointer to struct dvb_adapter
 * @name:	Adapter's name
 * @module:	initialized with THIS_MODULE at the caller
 * @device:	pointer to struct device that corresponds to the device driver
 * @adapter_nums: Array with a list of the numbers for @dvb_register_adapter;
 *		to select among them. Typically, initialized with:
 *		DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nums)
 */
int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
			 struct module *module, struct device *device,
			 short *adapter_nums);

/**
 * dvb_unregister_adapter - Unregisters a DVB adapter
 *
 * @adap:	pointer to struct dvb_adapter
 */
int dvb_unregister_adapter(struct dvb_adapter *adap);

/**
 * dvb_register_device - Registers a new DVB device
 *
 * @adap:	pointer to struct dvb_adapter
 * @pdvbdev:	pointer to the place where the new struct dvb_device will be
 *		stored
 * @template:	Template used to create &pdvbdev;
 * @priv:	private data
 * @type:	type of the device, as defined by &enum dvb_device_type.
 * @demux_sink_pads: Number of demux outputs, to be used to create the TS
 *		outputs via the Media Controller.
 */
int dvb_register_device(struct dvb_adapter *adap,
			struct dvb_device **pdvbdev,
			const struct dvb_device *template,
			void *priv,
			enum dvb_device_type type,
			int demux_sink_pads);

/**
 * dvb_remove_device - Remove a registered DVB device
 *
 * This does not free memory.  To do that, call dvb_free_device().
 *
 * @dvbdev:	pointer to struct dvb_device
 */
void dvb_remove_device(struct dvb_device *dvbdev);

/**
 * dvb_free_device - Free memory occupied by a DVB device.
 *
 * Call dvb_unregister_device() before calling this function.
 *
 * @dvbdev:	pointer to struct dvb_device
 */
void dvb_free_device(struct dvb_device *dvbdev);

/**
 * dvb_unregister_device - Unregisters a DVB device
 *
 * This is a combination of dvb_remove_device() and dvb_free_device().
 * Using this function is usually a mistake, and is often an indicator
 * for a use-after-free bug (when a userspace process keeps a file
 * handle to a detached device).
 *
 * @dvbdev:	pointer to struct dvb_device
 */
void dvb_unregister_device(struct dvb_device *dvbdev);

#ifdef CONFIG_MEDIA_CONTROLLER_DVB
/**
 * dvb_create_media_graph - Creates media graph for the Digital TV part of the
 *				device.
 *
 * @adap:			pointer to &struct dvb_adapter
 * @create_rf_connector:	if true, it creates the RF connector too
 *
 * This function checks all DVB-related functions at the media controller
 * entities and creates the needed links for the media graph. It is
 * capable of working with multiple tuners or multiple frontends, but it
 * won't create links if the device has multiple tuners and multiple frontends
 * or if the device has multiple muxes. In such case, the caller driver should
 * manually create the remaining links.
 */
__must_check int dvb_create_media_graph(struct dvb_adapter *adap,
					bool create_rf_connector);

/**
 * dvb_register_media_controller - registers a media controller at DVB adapter
 *
 * @adap:			pointer to &struct dvb_adapter
 * @mdev:			pointer to &struct media_device
 */
static inline void dvb_register_media_controller(struct dvb_adapter *adap,
						 struct media_device *mdev)
{
	adap->mdev = mdev;
}

/**
 * dvb_get_media_controller - gets the associated media controller
 *
 * @adap:			pointer to &struct dvb_adapter
 */
static inline struct media_device
*dvb_get_media_controller(struct dvb_adapter *adap)
{
	return adap->mdev;
}
#else
static inline
int dvb_create_media_graph(struct dvb_adapter *adap,
			   bool create_rf_connector)
{
	return 0;
};
#define dvb_register_media_controller(a, b) {}
#define dvb_get_media_controller(a) NULL
#endif

/**
 * dvb_generic_open - Digital TV open function, used by DVB devices
 *
 * @inode: pointer to &struct inode.
 * @file: pointer to &struct file.
 *
 * Checks if a DVB devnode is still valid, and if the permissions are
 * OK and increment negative use count.
 */
int dvb_generic_open(struct inode *inode, struct file *file);

/**
 * dvb_generic_close - Digital TV close function, used by DVB devices
 *
 * @inode: pointer to &struct inode.
 * @file: pointer to &struct file.
 *
 * Checks if a DVB devnode is still valid, and if the permissions are
 * OK and decrement negative use count.
 */
int dvb_generic_release(struct inode *inode, struct file *file);

/**
 * dvb_generic_ioctl - Digital TV close function, used by DVB devices
 *
 * @file: pointer to &struct file.
 * @cmd: Ioctl name.
 * @arg: Ioctl argument.
 *
 * Checks if a DVB devnode and struct dvbdev.kernel_ioctl is still valid.
 * If so, calls dvb_usercopy().
 */
long dvb_generic_ioctl(struct file *file,
		       unsigned int cmd, unsigned long arg);

/**
 * dvb_usercopy - copies data from/to userspace memory when an ioctl is
 *      issued.
 *
 * @file: Pointer to struct &file.
 * @cmd: Ioctl name.
 * @arg: Ioctl argument.
 * @func: function that will actually handle the ioctl
 *
 * Ancillary function that uses ioctl direction and size to copy from
 * userspace. Then, it calls @func, and, if needed, data is copied back
 * to userspace.
 */
int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
		 int (*func)(struct file *file, unsigned int cmd, void *arg));

#if IS_ENABLED(CONFIG_I2C)

struct i2c_adapter;
struct i2c_client;
/**
 * dvb_module_probe - helper routine to probe an I2C module
 *
 * @module_name:
 *	Name of the I2C module to be probed
 * @name:
 *	Optional name for the I2C module. Used for debug purposes.
 * 	If %NULL, defaults to @module_name.
 * @adap:
 *	pointer to &struct i2c_adapter that describes the I2C adapter where
 *	the module will be bound.
 * @addr:
 *	I2C address of the adapter, in 7-bit notation.
 * @platform_data:
 *	Platform data to be passed to the I2C module probed.
 *
 * This function binds an I2C device into the DVB core. Should be used by
 * all drivers that use I2C bus to control the hardware. A module bound
 * with dvb_module_probe() should use dvb_module_release() to unbind.
 *
 * Return:
 *	On success, return an &struct i2c_client, pointing the the bound
 *	I2C device. %NULL otherwise.
 *
 * .. note::
 *
 *    In the past, DVB modules (mainly, frontends) were bound via dvb_attach()
 *    macro, with does an ugly hack, using I2C low level functions. Such
 *    usage is deprecated and will be removed soon. Instead, use this routine.
 */
struct i2c_client *dvb_module_probe(const char *module_name,
				    const char *name,
				    struct i2c_adapter *adap,
				    unsigned char addr,
				    void *platform_data);

/**
 * dvb_module_release - releases an I2C device allocated with
 *	 dvb_module_probe().
 *
 * @client: pointer to &struct i2c_client with the I2C client to be released.
 *	    can be %NULL.
 *
 * This function should be used to free all resources reserved by
 * dvb_module_probe() and unbinding the I2C hardware.
 */
void dvb_module_release(struct i2c_client *client);

#endif /* CONFIG_I2C */

/* Legacy generic DVB attach function. */
#ifdef CONFIG_MEDIA_ATTACH

/**
 * dvb_attach - attaches a DVB frontend into the DVB core.
 *
 * @FUNCTION:	function on a frontend module to be called.
 * @ARGS...:	@FUNCTION arguments.
 *
 * This ancillary function loads a frontend module in runtime and runs
 * the @FUNCTION function there, with @ARGS.
 * As it increments symbol usage cont, at unregister, dvb_detach()
 * should be called.
 *
 * .. note::
 *
 *    In the past, DVB modules (mainly, frontends) were bound via dvb_attach()
 *    macro, with does an ugly hack, using I2C low level functions. Such
 *    usage is deprecated and will be removed soon. Instead, you should use
 *    dvb_module_probe().
 */
#define dvb_attach(FUNCTION, ARGS...) ({ \
	void *__r = NULL; \
	typeof(&FUNCTION) __a = symbol_request(FUNCTION); \
	if (__a) { \
		__r = (void *) __a(ARGS); \
		if (__r == NULL) \
			symbol_put(FUNCTION); \
	} else { \
		printk(KERN_ERR "DVB: Unable to find symbol "#FUNCTION"()\n"); \
	} \
	__r; \
})

/**
 * dvb_detach - detaches a DVB frontend loaded via dvb_attach()
 *
 * @FUNC:	attach function
 *
 * Decrements usage count for a function previously called via dvb_attach().
 */

#define dvb_detach(FUNC)	symbol_put_addr(FUNC)

#else
#define dvb_attach(FUNCTION, ARGS...) ({ \
	FUNCTION(ARGS); \
})

#define dvb_detach(FUNC)	{}

#endif	/* CONFIG_MEDIA_ATTACH */

#endif /* #ifndef _DVBDEV_H_ */