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 */
57 enum 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
76 struct 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 * Use of this flag is currently deprecated.
91 * @mfe_dvbdev: Frontend device in use, in the case of MFE
92 * @mfe_lock: Lock to prevent using the other frontends when MFE is
93 * used.
94 * @mdev_lock: Protect access to the mdev pointer.
95 * @mdev: pointer to struct media_device, used when the media
96 * controller is used.
97 * @conn: RF connector. Used only if the device has no separate
98 * tuner.
99 * @conn_pads: pointer to struct media_pad associated with @conn;
100 */
101 struct dvb_adapter {
102 int num;
103 struct list_head list_head;
104 struct list_head device_list;
105 const char *name;
106 u8 proposed_mac [6];
107 void* priv;
108
109 struct device *device;
110
111 struct module *module;
112
113 int mfe_shared; /* indicates mutually exclusive frontends */
114 struct dvb_device *mfe_dvbdev; /* frontend device in use */
115 struct mutex mfe_lock; /* access lock for thread creation */
116
117 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
118 struct mutex mdev_lock;
119 struct media_device *mdev;
120 struct media_entity *conn;
121 struct media_pad *conn_pads;
122 #endif
123 };
124
125 /**
126 * struct dvb_device - represents a DVB device node
127 *
128 * @list_head: List head with all DVB devices
129 * @fops: pointer to struct file_operations
130 * @adapter: pointer to the adapter that holds this device node
131 * @type: type of the device, as defined by &enum dvb_device_type.
132 * @minor: devnode minor number. Major number is always DVB_MAJOR.
133 * @id: device ID number, inside the adapter
134 * @readers: Initialized by the caller. Each call to open() in Read Only mode
135 * decreases this counter by one.
136 * @writers: Initialized by the caller. Each call to open() in Read/Write
137 * mode decreases this counter by one.
138 * @users: Initialized by the caller. Each call to open() in any mode
139 * decreases this counter by one.
140 * @wait_queue: wait queue, used to wait for certain events inside one of
141 * the DVB API callers
142 * @kernel_ioctl: callback function used to handle ioctl calls from userspace.
143 * @name: Name to be used for the device at the Media Controller
144 * @entity: pointer to struct media_entity associated with the device node
145 * @pads: pointer to struct media_pad associated with @entity;
146 * @priv: private data
147 * @intf_devnode: Pointer to media_intf_devnode. Used by the dvbdev core to
148 * store the MC device node interface
149 * @tsout_num_entities: Number of Transport Stream output entities
150 * @tsout_entity: array with MC entities associated to each TS output node
151 * @tsout_pads: array with the source pads for each @tsout_entity
152 *
153 * This structure is used by the DVB core (frontend, CA, net, demux) in
154 * order to create the device nodes. Usually, driver should not initialize
155 * this struct diretly.
156 */
157 struct dvb_device {
158 struct list_head list_head;
159 const struct file_operations *fops;
160 struct dvb_adapter *adapter;
161 enum dvb_device_type type;
162 int minor;
163 u32 id;
164
165 /* in theory, 'users' can vanish now,
166 but I don't want to change too much now... */
167 int readers;
168 int writers;
169 int users;
170
171 wait_queue_head_t wait_queue;
172 /* don't really need those !? -- FIXME: use video_usercopy */
173 int (*kernel_ioctl)(struct file *file, unsigned int cmd, void *arg);
174
175 /* Needed for media controller register/unregister */
176 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
177 const char *name;
178
179 /* Allocated and filled inside dvbdev.c */
180 struct media_intf_devnode *intf_devnode;
181
182 unsigned tsout_num_entities;
183 struct media_entity *entity, *tsout_entity;
184 struct media_pad *pads, *tsout_pads;
185 #endif
186
187 void *priv;
188 };
189
190 /**
191 * dvb_register_adapter - Registers a new DVB adapter
192 *
193 * @adap: pointer to struct dvb_adapter
194 * @name: Adapter's name
195 * @module: initialized with THIS_MODULE at the caller
196 * @device: pointer to struct device that corresponds to the device driver
197 * @adapter_nums: Array with a list of the numbers for @dvb_register_adapter;
198 * to select among them. Typically, initialized with:
199 * DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nums)
200 */
201 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
202 struct module *module, struct device *device,
203 short *adapter_nums);
204
205 /**
206 * dvb_unregister_adapter - Unregisters a DVB adapter
207 *
208 * @adap: pointer to struct dvb_adapter
209 */
210 int dvb_unregister_adapter(struct dvb_adapter *adap);
211
212 /**
213 * dvb_register_device - Registers a new DVB device
214 *
215 * @adap: pointer to struct dvb_adapter
216 * @pdvbdev: pointer to the place where the new struct dvb_device will be
217 * stored
218 * @template: Template used to create &pdvbdev;
219 * @priv: private data
220 * @type: type of the device, as defined by &enum dvb_device_type.
221 * @demux_sink_pads: Number of demux outputs, to be used to create the TS
222 * outputs via the Media Controller.
223 */
224 int dvb_register_device(struct dvb_adapter *adap,
225 struct dvb_device **pdvbdev,
226 const struct dvb_device *template,
227 void *priv,
228 enum dvb_device_type type,
229 int demux_sink_pads);
230
231 /**
232 * dvb_remove_device - Remove a registered DVB device
233 *
234 * This does not free memory. To do that, call dvb_free_device().
235 *
236 * @dvbdev: pointer to struct dvb_device
237 */
238 void dvb_remove_device(struct dvb_device *dvbdev);
239
240 /**
241 * dvb_free_device - Free memory occupied by a DVB device.
242 *
243 * Call dvb_unregister_device() before calling this function.
244 *
245 * @dvbdev: pointer to struct dvb_device
246 */
247 void dvb_free_device(struct dvb_device *dvbdev);
248
249 /**
250 * dvb_unregister_device - Unregisters a DVB device
251 *
252 * This is a combination of dvb_remove_device() and dvb_free_device().
253 * Using this function is usually a mistake, and is often an indicator
254 * for a use-after-free bug (when a userspace process keeps a file
255 * handle to a detached device).
256 *
257 * @dvbdev: pointer to struct dvb_device
258 */
259 void dvb_unregister_device(struct dvb_device *dvbdev);
260
261 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
262 /**
263 * dvb_create_media_graph - Creates media graph for the Digital TV part of the
264 * device.
265 *
266 * @adap: pointer to &struct dvb_adapter
267 * @create_rf_connector: if true, it creates the RF connector too
268 *
269 * This function checks all DVB-related functions at the media controller
270 * entities and creates the needed links for the media graph. It is
271 * capable of working with multiple tuners or multiple frontends, but it
272 * won't create links if the device has multiple tuners and multiple frontends
273 * or if the device has multiple muxes. In such case, the caller driver should
274 * manually create the remaining links.
275 */
276 __must_check int dvb_create_media_graph(struct dvb_adapter *adap,
277 bool create_rf_connector);
278
279 /**
280 * dvb_register_media_controller - registers a media controller at DVB adapter
281 *
282 * @adap: pointer to &struct dvb_adapter
283 * @mdev: pointer to &struct media_device
284 */
dvb_register_media_controller(struct dvb_adapter * adap,struct media_device * mdev)285 static inline void dvb_register_media_controller(struct dvb_adapter *adap,
286 struct media_device *mdev)
287 {
288 adap->mdev = mdev;
289 }
290
291 /**
292 * dvb_get_media_controller - gets the associated media controller
293 *
294 * @adap: pointer to &struct dvb_adapter
295 */
296 static inline struct media_device *
dvb_get_media_controller(struct dvb_adapter * adap)297 dvb_get_media_controller(struct dvb_adapter *adap)
298 {
299 return adap->mdev;
300 }
301 #else
302 static inline
dvb_create_media_graph(struct dvb_adapter * adap,bool create_rf_connector)303 int dvb_create_media_graph(struct dvb_adapter *adap,
304 bool create_rf_connector)
305 {
306 return 0;
307 };
308 #define dvb_register_media_controller(a, b) {}
309 #define dvb_get_media_controller(a) NULL
310 #endif
311
312 /**
313 * dvb_generic_open - Digital TV open function, used by DVB devices
314 *
315 * @inode: pointer to &struct inode.
316 * @file: pointer to &struct file.
317 *
318 * Checks if a DVB devnode is still valid, and if the permissions are
319 * OK and increment negative use count.
320 */
321 int dvb_generic_open(struct inode *inode, struct file *file);
322
323 /**
324 * dvb_generic_release - Digital TV close function, used by DVB devices
325 *
326 * @inode: pointer to &struct inode.
327 * @file: pointer to &struct file.
328 *
329 * Checks if a DVB devnode is still valid, and if the permissions are
330 * OK and decrement negative use count.
331 */
332 int dvb_generic_release(struct inode *inode, struct file *file);
333
334 /**
335 * dvb_generic_ioctl - Digital TV close function, used by DVB devices
336 *
337 * @file: pointer to &struct file.
338 * @cmd: Ioctl name.
339 * @arg: Ioctl argument.
340 *
341 * Checks if a DVB devnode and struct dvbdev.kernel_ioctl is still valid.
342 * If so, calls dvb_usercopy().
343 */
344 long dvb_generic_ioctl(struct file *file,
345 unsigned int cmd, unsigned long arg);
346
347 /**
348 * dvb_usercopy - copies data from/to userspace memory when an ioctl is
349 * issued.
350 *
351 * @file: Pointer to struct &file.
352 * @cmd: Ioctl name.
353 * @arg: Ioctl argument.
354 * @func: function that will actually handle the ioctl
355 *
356 * Ancillary function that uses ioctl direction and size to copy from
357 * userspace. Then, it calls @func, and, if needed, data is copied back
358 * to userspace.
359 */
360 int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
361 int (*func)(struct file *file, unsigned int cmd, void *arg));
362
363 #if IS_ENABLED(CONFIG_I2C)
364
365 struct i2c_adapter;
366 struct i2c_client;
367 /**
368 * dvb_module_probe - helper routine to probe an I2C module
369 *
370 * @module_name:
371 * Name of the I2C module to be probed
372 * @name:
373 * Optional name for the I2C module. Used for debug purposes.
374 * If %NULL, defaults to @module_name.
375 * @adap:
376 * pointer to &struct i2c_adapter that describes the I2C adapter where
377 * the module will be bound.
378 * @addr:
379 * I2C address of the adapter, in 7-bit notation.
380 * @platform_data:
381 * Platform data to be passed to the I2C module probed.
382 *
383 * This function binds an I2C device into the DVB core. Should be used by
384 * all drivers that use I2C bus to control the hardware. A module bound
385 * with dvb_module_probe() should use dvb_module_release() to unbind.
386 *
387 * Return:
388 * On success, return an &struct i2c_client, pointing to the bound
389 * I2C device. %NULL otherwise.
390 *
391 * .. note::
392 *
393 * In the past, DVB modules (mainly, frontends) were bound via dvb_attach()
394 * macro, with does an ugly hack, using I2C low level functions. Such
395 * usage is deprecated and will be removed soon. Instead, use this routine.
396 */
397 struct i2c_client *dvb_module_probe(const char *module_name,
398 const char *name,
399 struct i2c_adapter *adap,
400 unsigned char addr,
401 void *platform_data);
402
403 /**
404 * dvb_module_release - releases an I2C device allocated with
405 * dvb_module_probe().
406 *
407 * @client: pointer to &struct i2c_client with the I2C client to be released.
408 * can be %NULL.
409 *
410 * This function should be used to free all resources reserved by
411 * dvb_module_probe() and unbinding the I2C hardware.
412 */
413 void dvb_module_release(struct i2c_client *client);
414
415 #endif /* CONFIG_I2C */
416
417 /* Legacy generic DVB attach function. */
418 #ifdef CONFIG_MEDIA_ATTACH
419
420 /**
421 * dvb_attach - attaches a DVB frontend into the DVB core.
422 *
423 * @FUNCTION: function on a frontend module to be called.
424 * @ARGS: @FUNCTION arguments.
425 *
426 * This ancillary function loads a frontend module in runtime and runs
427 * the @FUNCTION function there, with @ARGS.
428 * As it increments symbol usage cont, at unregister, dvb_detach()
429 * should be called.
430 *
431 * .. note::
432 *
433 * In the past, DVB modules (mainly, frontends) were bound via dvb_attach()
434 * macro, with does an ugly hack, using I2C low level functions. Such
435 * usage is deprecated and will be removed soon. Instead, you should use
436 * dvb_module_probe().
437 */
438 #define dvb_attach(FUNCTION, ARGS...) ({ \
439 void *__r = NULL; \
440 typeof(&FUNCTION) __a = symbol_request(FUNCTION); \
441 if (__a) { \
442 __r = (void *) __a(ARGS); \
443 if (__r == NULL) \
444 symbol_put(FUNCTION); \
445 } else { \
446 printk(KERN_ERR "DVB: Unable to find symbol "#FUNCTION"()\n"); \
447 } \
448 __r; \
449 })
450
451 /**
452 * dvb_detach - detaches a DVB frontend loaded via dvb_attach()
453 *
454 * @FUNC: attach function
455 *
456 * Decrements usage count for a function previously called via dvb_attach().
457 */
458
459 #define dvb_detach(FUNC) symbol_put_addr(FUNC)
460
461 #else
462 #define dvb_attach(FUNCTION, ARGS...) ({ \
463 FUNCTION(ARGS); \
464 })
465
466 #define dvb_detach(FUNC) {}
467
468 #endif /* CONFIG_MEDIA_ATTACH */
469
470 #endif /* #ifndef _DVBDEV_H_ */
471