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1/*
2 * dvbdev.h
3 *
4 * Copyright (C) 2000 Ralph Metzler & Marcus Metzler
5 * for convergence integrated media GmbH
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Lesser Public License
9 * as published by the Free Software Foundation; either version 2.1
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 */
18
19#ifndef _DVBDEV_H_
20#define _DVBDEV_H_
21
22#include <linux/types.h>
23#include <linux/poll.h>
24#include <linux/fs.h>
25#include <linux/list.h>
26#include <media/media-device.h>
27
28#define DVB_MAJOR 212
29
30#if defined(CONFIG_DVB_MAX_ADAPTERS) && CONFIG_DVB_MAX_ADAPTERS > 0
31 #define DVB_MAX_ADAPTERS CONFIG_DVB_MAX_ADAPTERS
32#else
33 #define DVB_MAX_ADAPTERS 16
34#endif
35
36#define DVB_UNSET (-1)
37
38/* List of DVB device types */
39
40/**
41 * enum dvb_device_type - type of the Digital TV device
42 *
43 * @DVB_DEVICE_SEC: Digital TV standalone Common Interface (CI)
44 * @DVB_DEVICE_FRONTEND: Digital TV frontend.
45 * @DVB_DEVICE_DEMUX: Digital TV demux.
46 * @DVB_DEVICE_DVR: Digital TV digital video record (DVR).
47 * @DVB_DEVICE_CA: Digital TV Conditional Access (CA).
48 * @DVB_DEVICE_NET: Digital TV network.
49 *
50 * @DVB_DEVICE_VIDEO: Digital TV video decoder.
51 * Deprecated. Used only on av7110-av.
52 * @DVB_DEVICE_AUDIO: Digital TV audio decoder.
53 * Deprecated. Used only on av7110-av.
54 * @DVB_DEVICE_OSD: Digital TV On Screen Display (OSD).
55 * Deprecated. Used only on av7110.
56 */
57enum dvb_device_type {
58 DVB_DEVICE_SEC,
59 DVB_DEVICE_FRONTEND,
60 DVB_DEVICE_DEMUX,
61 DVB_DEVICE_DVR,
62 DVB_DEVICE_CA,
63 DVB_DEVICE_NET,
64
65 DVB_DEVICE_VIDEO,
66 DVB_DEVICE_AUDIO,
67 DVB_DEVICE_OSD,
68};
69
70#define DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr) \
71 static short adapter_nr[] = \
72 {[0 ... (DVB_MAX_ADAPTERS - 1)] = DVB_UNSET }; \
73 module_param_array(adapter_nr, short, NULL, 0444); \
74 MODULE_PARM_DESC(adapter_nr, "DVB adapter numbers")
75
76struct dvb_frontend;
77
78/**
79 * struct dvb_adapter - represents a Digital TV adapter using Linux DVB API
80 *
81 * @num: Number of the adapter
82 * @list_head: List with the DVB adapters
83 * @device_list: List with the DVB devices
84 * @name: Name of the adapter
85 * @proposed_mac: proposed MAC address for the adapter
86 * @priv: private data
87 * @device: pointer to struct device
88 * @module: pointer to struct module
89 * @mfe_shared: indicates mutually exclusive frontends.
90 * 1 = legacy exclusion behavior: blocking any open() call
91 * 2 = enhanced exclusion behavior, emulating the standard
92 * behavior of busy frontends: allowing read-only sharing
93 * and otherwise returning immediately with -EBUSY when any
94 * of the frontends is already opened with write access.
95 * @mfe_dvbdev: Frontend device in use, in the case of MFE
96 * @mfe_lock: Lock to prevent using the other frontends when MFE is
97 * used.
98 * @mdev_lock: Protect access to the mdev pointer.
99 * @mdev: pointer to struct media_device, used when the media
100 * controller is used.
101 * @conn: RF connector. Used only if the device has no separate
102 * tuner.
103 * @conn_pads: pointer to struct media_pad associated with @conn;
104 */
105struct dvb_adapter {
106 int num;
107 struct list_head list_head;
108 struct list_head device_list;
109 const char *name;
110 u8 proposed_mac [6];
111 void* priv;
112
113 struct device *device;
114
115 struct module *module;
116
117 int mfe_shared; /* indicates mutually exclusive frontends */
118 struct dvb_device *mfe_dvbdev; /* frontend device in use */
119 struct mutex mfe_lock; /* access lock for thread creation */
120
121#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
122 struct mutex mdev_lock;
123 struct media_device *mdev;
124 struct media_entity *conn;
125 struct media_pad *conn_pads;
126#endif
127};
128
129/**
130 * struct dvb_device - represents a DVB device node
131 *
132 * @list_head: List head with all DVB devices
133 * @ref: reference count for this device
134 * @fops: pointer to struct file_operations
135 * @adapter: pointer to the adapter that holds this device node
136 * @type: type of the device, as defined by &enum dvb_device_type.
137 * @minor: devnode minor number. Major number is always DVB_MAJOR.
138 * @id: device ID number, inside the adapter
139 * @readers: Initialized by the caller. Each call to open() in Read Only mode
140 * decreases this counter by one.
141 * @writers: Initialized by the caller. Each call to open() in Read/Write
142 * mode decreases this counter by one.
143 * @users: Initialized by the caller. Each call to open() in any mode
144 * decreases this counter by one.
145 * @wait_queue: wait queue, used to wait for certain events inside one of
146 * the DVB API callers
147 * @kernel_ioctl: callback function used to handle ioctl calls from userspace.
148 * @name: Name to be used for the device at the Media Controller
149 * @entity: pointer to struct media_entity associated with the device node
150 * @pads: pointer to struct media_pad associated with @entity;
151 * @priv: private data
152 * @intf_devnode: Pointer to media_intf_devnode. Used by the dvbdev core to
153 * store the MC device node interface
154 * @tsout_num_entities: Number of Transport Stream output entities
155 * @tsout_entity: array with MC entities associated to each TS output node
156 * @tsout_pads: array with the source pads for each @tsout_entity
157 *
158 * This structure is used by the DVB core (frontend, CA, net, demux) in
159 * order to create the device nodes. Usually, driver should not initialize
160 * this struct diretly.
161 */
162struct dvb_device {
163 struct list_head list_head;
164 struct kref ref;
165 const struct file_operations *fops;
166 struct dvb_adapter *adapter;
167 enum dvb_device_type type;
168 int minor;
169 u32 id;
170
171 /* in theory, 'users' can vanish now,
172 but I don't want to change too much now... */
173 int readers;
174 int writers;
175 int users;
176
177 wait_queue_head_t wait_queue;
178 /* don't really need those !? -- FIXME: use video_usercopy */
179 int (*kernel_ioctl)(struct file *file, unsigned int cmd, void *arg);
180
181 /* Needed for media controller register/unregister */
182#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
183 const char *name;
184
185 /* Allocated and filled inside dvbdev.c */
186 struct media_intf_devnode *intf_devnode;
187
188 unsigned tsout_num_entities;
189 struct media_entity *entity, *tsout_entity;
190 struct media_pad *pads, *tsout_pads;
191#endif
192
193 void *priv;
194};
195
196/**
197 * struct dvbdevfops_node - fops nodes registered in dvbdevfops_list
198 *
199 * @fops: Dynamically allocated fops for ->owner registration
200 * @type: type of dvb_device
201 * @template: dvb_device used for registration
202 * @list_head: list_head for dvbdevfops_list
203 */
204struct dvbdevfops_node {
205 struct file_operations *fops;
206 enum dvb_device_type type;
207 const struct dvb_device *template;
208 struct list_head list_head;
209};
210
211/**
212 * dvb_device_get - Increase dvb_device reference
213 *
214 * @dvbdev: pointer to struct dvb_device
215 */
216struct dvb_device *dvb_device_get(struct dvb_device *dvbdev);
217
218/**
219 * dvb_device_put - Decrease dvb_device reference
220 *
221 * @dvbdev: pointer to struct dvb_device
222 */
223void dvb_device_put(struct dvb_device *dvbdev);
224
225/**
226 * dvb_register_adapter - Registers a new DVB adapter
227 *
228 * @adap: pointer to struct dvb_adapter
229 * @name: Adapter's name
230 * @module: initialized with THIS_MODULE at the caller
231 * @device: pointer to struct device that corresponds to the device driver
232 * @adapter_nums: Array with a list of the numbers for @dvb_register_adapter;
233 * to select among them. Typically, initialized with:
234 * DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nums)
235 */
236int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
237 struct module *module, struct device *device,
238 short *adapter_nums);
239
240/**
241 * dvb_unregister_adapter - Unregisters a DVB adapter
242 *
243 * @adap: pointer to struct dvb_adapter
244 */
245int dvb_unregister_adapter(struct dvb_adapter *adap);
246
247/**
248 * dvb_register_device - Registers a new DVB device
249 *
250 * @adap: pointer to struct dvb_adapter
251 * @pdvbdev: pointer to the place where the new struct dvb_device will be
252 * stored
253 * @template: Template used to create &pdvbdev;
254 * @priv: private data
255 * @type: type of the device, as defined by &enum dvb_device_type.
256 * @demux_sink_pads: Number of demux outputs, to be used to create the TS
257 * outputs via the Media Controller.
258 */
259int dvb_register_device(struct dvb_adapter *adap,
260 struct dvb_device **pdvbdev,
261 const struct dvb_device *template,
262 void *priv,
263 enum dvb_device_type type,
264 int demux_sink_pads);
265
266/**
267 * dvb_remove_device - Remove a registered DVB device
268 *
269 * @dvbdev: pointer to struct dvb_device
270 *
271 * This does not free memory. dvb_free_device() will do that when
272 * reference counter is empty
273 */
274void dvb_remove_device(struct dvb_device *dvbdev);
275
276
277/**
278 * dvb_unregister_device - Unregisters a DVB device
279 *
280 * @dvbdev: pointer to struct dvb_device
281 */
282void dvb_unregister_device(struct dvb_device *dvbdev);
283
284#ifdef CONFIG_MEDIA_CONTROLLER_DVB
285/**
286 * dvb_create_media_graph - Creates media graph for the Digital TV part of the
287 * device.
288 *
289 * @adap: pointer to &struct dvb_adapter
290 * @create_rf_connector: if true, it creates the RF connector too
291 *
292 * This function checks all DVB-related functions at the media controller
293 * entities and creates the needed links for the media graph. It is
294 * capable of working with multiple tuners or multiple frontends, but it
295 * won't create links if the device has multiple tuners and multiple frontends
296 * or if the device has multiple muxes. In such case, the caller driver should
297 * manually create the remaining links.
298 */
299__must_check int dvb_create_media_graph(struct dvb_adapter *adap,
300 bool create_rf_connector);
301
302/**
303 * dvb_register_media_controller - registers a media controller at DVB adapter
304 *
305 * @adap: pointer to &struct dvb_adapter
306 * @mdev: pointer to &struct media_device
307 */
308static inline void dvb_register_media_controller(struct dvb_adapter *adap,
309 struct media_device *mdev)
310{
311 adap->mdev = mdev;
312}
313
314/**
315 * dvb_get_media_controller - gets the associated media controller
316 *
317 * @adap: pointer to &struct dvb_adapter
318 */
319static inline struct media_device *
320dvb_get_media_controller(struct dvb_adapter *adap)
321{
322 return adap->mdev;
323}
324#else
325static inline
326int dvb_create_media_graph(struct dvb_adapter *adap,
327 bool create_rf_connector)
328{
329 return 0;
330};
331#define dvb_register_media_controller(a, b) {}
332#define dvb_get_media_controller(a) NULL
333#endif
334
335/**
336 * dvb_generic_open - Digital TV open function, used by DVB devices
337 *
338 * @inode: pointer to &struct inode.
339 * @file: pointer to &struct file.
340 *
341 * Checks if a DVB devnode is still valid, and if the permissions are
342 * OK and increment negative use count.
343 */
344int dvb_generic_open(struct inode *inode, struct file *file);
345
346/**
347 * dvb_generic_release - Digital TV close function, used by DVB devices
348 *
349 * @inode: pointer to &struct inode.
350 * @file: pointer to &struct file.
351 *
352 * Checks if a DVB devnode is still valid, and if the permissions are
353 * OK and decrement negative use count.
354 */
355int dvb_generic_release(struct inode *inode, struct file *file);
356
357/**
358 * dvb_generic_ioctl - Digital TV close function, used by DVB devices
359 *
360 * @file: pointer to &struct file.
361 * @cmd: Ioctl name.
362 * @arg: Ioctl argument.
363 *
364 * Checks if a DVB devnode and struct dvbdev.kernel_ioctl is still valid.
365 * If so, calls dvb_usercopy().
366 */
367long dvb_generic_ioctl(struct file *file,
368 unsigned int cmd, unsigned long arg);
369
370/**
371 * dvb_usercopy - copies data from/to userspace memory when an ioctl is
372 * issued.
373 *
374 * @file: Pointer to struct &file.
375 * @cmd: Ioctl name.
376 * @arg: Ioctl argument.
377 * @func: function that will actually handle the ioctl
378 *
379 * Ancillary function that uses ioctl direction and size to copy from
380 * userspace. Then, it calls @func, and, if needed, data is copied back
381 * to userspace.
382 */
383int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
384 int (*func)(struct file *file, unsigned int cmd, void *arg));
385
386#if IS_ENABLED(CONFIG_I2C)
387
388struct i2c_adapter;
389struct i2c_client;
390/**
391 * dvb_module_probe - helper routine to probe an I2C module
392 *
393 * @module_name:
394 * Name of the I2C module to be probed
395 * @name:
396 * Optional name for the I2C module. Used for debug purposes.
397 * If %NULL, defaults to @module_name.
398 * @adap:
399 * pointer to &struct i2c_adapter that describes the I2C adapter where
400 * the module will be bound.
401 * @addr:
402 * I2C address of the adapter, in 7-bit notation.
403 * @platform_data:
404 * Platform data to be passed to the I2C module probed.
405 *
406 * This function binds an I2C device into the DVB core. Should be used by
407 * all drivers that use I2C bus to control the hardware. A module bound
408 * with dvb_module_probe() should use dvb_module_release() to unbind.
409 *
410 * Return:
411 * On success, return an &struct i2c_client, pointing to the bound
412 * I2C device. %NULL otherwise.
413 *
414 * .. note::
415 *
416 * In the past, DVB modules (mainly, frontends) were bound via dvb_attach()
417 * macro, with does an ugly hack, using I2C low level functions. Such
418 * usage is deprecated and will be removed soon. Instead, use this routine.
419 */
420struct i2c_client *dvb_module_probe(const char *module_name,
421 const char *name,
422 struct i2c_adapter *adap,
423 unsigned char addr,
424 void *platform_data);
425
426/**
427 * dvb_module_release - releases an I2C device allocated with
428 * dvb_module_probe().
429 *
430 * @client: pointer to &struct i2c_client with the I2C client to be released.
431 * can be %NULL.
432 *
433 * This function should be used to free all resources reserved by
434 * dvb_module_probe() and unbinding the I2C hardware.
435 */
436void dvb_module_release(struct i2c_client *client);
437
438#endif /* CONFIG_I2C */
439
440/* Legacy generic DVB attach function. */
441#ifdef CONFIG_MEDIA_ATTACH
442
443/**
444 * dvb_attach - attaches a DVB frontend into the DVB core.
445 *
446 * @FUNCTION: function on a frontend module to be called.
447 * @ARGS: @FUNCTION arguments.
448 *
449 * This ancillary function loads a frontend module in runtime and runs
450 * the @FUNCTION function there, with @ARGS.
451 * As it increments symbol usage cont, at unregister, dvb_detach()
452 * should be called.
453 *
454 * .. note::
455 *
456 * In the past, DVB modules (mainly, frontends) were bound via dvb_attach()
457 * macro, with does an ugly hack, using I2C low level functions. Such
458 * usage is deprecated and will be removed soon. Instead, you should use
459 * dvb_module_probe().
460 */
461#define dvb_attach(FUNCTION, ARGS...) ({ \
462 void *__r = NULL; \
463 typeof(&FUNCTION) __a = symbol_request(FUNCTION); \
464 if (__a) { \
465 __r = (void *) __a(ARGS); \
466 if (__r == NULL) \
467 symbol_put(FUNCTION); \
468 } else { \
469 printk(KERN_ERR "DVB: Unable to find symbol "#FUNCTION"()\n"); \
470 } \
471 __r; \
472})
473
474/**
475 * dvb_detach - detaches a DVB frontend loaded via dvb_attach()
476 *
477 * @FUNC: attach function
478 *
479 * Decrements usage count for a function previously called via dvb_attach().
480 */
481
482#define dvb_detach(FUNC) symbol_put_addr(FUNC)
483
484#else
485#define dvb_attach(FUNCTION, ARGS...) ({ \
486 FUNCTION(ARGS); \
487})
488
489#define dvb_detach(FUNC) {}
490
491#endif /* CONFIG_MEDIA_ATTACH */
492
493#endif /* #ifndef _DVBDEV_H_ */