include/media/dvbdev.h

   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:         mfe shared: indicates mutually exclusive frontends
  90  *                      Thie usage 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  */
 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
 297 *dvb_get_media_controller(struct dvb_adapter *adap)
 298 {
 299         return adap->mdev;
 300 }
 301 #else
 302 static inline
 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_close - 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 the 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_ */