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