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 * 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 */ 105 struct 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 */ 162 struct 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 */ 204 struct 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 */ 216 struct 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 */ 223 void 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 */ 236 int 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 */ 245 int 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 */ 259 int 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 */ 274 void 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 */ 282 void 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 */ 308 static 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 */ 319 static inline struct media_device * 320 dvb_get_media_controller(struct dvb_adapter *adap) 321 { 322 return adap->mdev; 323 } 324 #else 325 static inline 326 int 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 */ 344 int 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 */ 355 int 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 */ 367 long 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 */ 383 int 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) 387 388 struct i2c_adapter; 389 struct 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 */ 420 struct 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 */ 436 void 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_ */ 494