LCOV - code coverage report
Current view: top level - include/media - v4l2-device.h (source / functions) Hit Total Coverage
Test: Real Lines: 1 4 25.0 %
Date: 2020-10-17 15:46:43 Functions: 0 0 -
Legend: Neither, QEMU, Real, Both Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0-or-later */
       2                 :            : /*
       3                 :            :     V4L2 device support header.
       4                 :            : 
       5                 :            :     Copyright (C) 2008  Hans Verkuil <hverkuil@xs4all.nl>
       6                 :            : 
       7                 :            :  */
       8                 :            : 
       9                 :            : #ifndef _V4L2_DEVICE_H
      10                 :            : #define _V4L2_DEVICE_H
      11                 :            : 
      12                 :            : #include <media/media-device.h>
      13                 :            : #include <media/v4l2-subdev.h>
      14                 :            : #include <media/v4l2-dev.h>
      15                 :            : 
      16                 :            : #define V4L2_DEVICE_NAME_SIZE (20 + 16)
      17                 :            : 
      18                 :            : struct v4l2_ctrl_handler;
      19                 :            : 
      20                 :            : /**
      21                 :            :  * struct v4l2_device - main struct to for V4L2 device drivers
      22                 :            :  *
      23                 :            :  * @dev: pointer to struct device.
      24                 :            :  * @mdev: pointer to struct media_device, may be NULL.
      25                 :            :  * @subdevs: used to keep track of the registered subdevs
      26                 :            :  * @lock: lock this struct; can be used by the driver as well
      27                 :            :  *      if this struct is embedded into a larger struct.
      28                 :            :  * @name: unique device name, by default the driver name + bus ID
      29                 :            :  * @notify: notify operation called by some sub-devices.
      30                 :            :  * @ctrl_handler: The control handler. May be %NULL.
      31                 :            :  * @prio: Device's priority state
      32                 :            :  * @ref: Keep track of the references to this struct.
      33                 :            :  * @release: Release function that is called when the ref count
      34                 :            :  *      goes to 0.
      35                 :            :  *
      36                 :            :  * Each instance of a V4L2 device should create the v4l2_device struct,
      37                 :            :  * either stand-alone or embedded in a larger struct.
      38                 :            :  *
      39                 :            :  * It allows easy access to sub-devices (see v4l2-subdev.h) and provides
      40                 :            :  * basic V4L2 device-level support.
      41                 :            :  *
      42                 :            :  * .. note::
      43                 :            :  *
      44                 :            :  *    #) @dev->driver_data points to this struct.
      45                 :            :  *    #) @dev might be %NULL if there is no parent device
      46                 :            :  */
      47                 :            : struct v4l2_device {
      48                 :            :         struct device *dev;
      49                 :            :         struct media_device *mdev;
      50                 :            :         struct list_head subdevs;
      51                 :            :         spinlock_t lock;
      52                 :            :         char name[V4L2_DEVICE_NAME_SIZE];
      53                 :            :         void (*notify)(struct v4l2_subdev *sd,
      54                 :            :                         unsigned int notification, void *arg);
      55                 :            :         struct v4l2_ctrl_handler *ctrl_handler;
      56                 :            :         struct v4l2_prio_state prio;
      57                 :            :         struct kref ref;
      58                 :            :         void (*release)(struct v4l2_device *v4l2_dev);
      59                 :            : };
      60                 :            : 
      61                 :            : /**
      62                 :            :  * v4l2_device_get - gets a V4L2 device reference
      63                 :            :  *
      64                 :            :  * @v4l2_dev: pointer to struct &v4l2_device
      65                 :            :  *
      66                 :            :  * This is an ancillary routine meant to increment the usage for the
      67                 :            :  * struct &v4l2_device pointed by @v4l2_dev.
      68                 :            :  */
      69                 :            : static inline void v4l2_device_get(struct v4l2_device *v4l2_dev)
      70                 :            : {
      71                 :            :         kref_get(&v4l2_dev->ref);
      72                 :            : }
      73                 :            : 
      74                 :            : /**
      75                 :            :  * v4l2_device_put - putss a V4L2 device reference
      76                 :            :  *
      77                 :            :  * @v4l2_dev: pointer to struct &v4l2_device
      78                 :            :  *
      79                 :            :  * This is an ancillary routine meant to decrement the usage for the
      80                 :            :  * struct &v4l2_device pointed by @v4l2_dev.
      81                 :            :  */
      82                 :            : int v4l2_device_put(struct v4l2_device *v4l2_dev);
      83                 :            : 
      84                 :            : /**
      85                 :            :  * v4l2_device_register - Initialize v4l2_dev and make @dev->driver_data
      86                 :            :  *      point to @v4l2_dev.
      87                 :            :  *
      88                 :            :  * @dev: pointer to struct &device
      89                 :            :  * @v4l2_dev: pointer to struct &v4l2_device
      90                 :            :  *
      91                 :            :  * .. note::
      92                 :            :  *      @dev may be %NULL in rare cases (ISA devices).
      93                 :            :  *      In such case the caller must fill in the @v4l2_dev->name field
      94                 :            :  *      before calling this function.
      95                 :            :  */
      96                 :            : int __must_check v4l2_device_register(struct device *dev,
      97                 :            :                                       struct v4l2_device *v4l2_dev);
      98                 :            : 
      99                 :            : /**
     100                 :            :  * v4l2_device_set_name - Optional function to initialize the
     101                 :            :  *      name field of struct &v4l2_device
     102                 :            :  *
     103                 :            :  * @v4l2_dev: pointer to struct &v4l2_device
     104                 :            :  * @basename: base name for the device name
     105                 :            :  * @instance: pointer to a static atomic_t var with the instance usage for
     106                 :            :  *      the device driver.
     107                 :            :  *
     108                 :            :  * v4l2_device_set_name() initializes the name field of struct &v4l2_device
     109                 :            :  * using the driver name and a driver-global atomic_t instance.
     110                 :            :  *
     111                 :            :  * This function will increment the instance counter and returns the
     112                 :            :  * instance value used in the name.
     113                 :            :  *
     114                 :            :  * Example:
     115                 :            :  *
     116                 :            :  *   static atomic_t drv_instance = ATOMIC_INIT(0);
     117                 :            :  *
     118                 :            :  *   ...
     119                 :            :  *
     120                 :            :  *   instance = v4l2_device_set_name(&\ v4l2_dev, "foo", &\ drv_instance);
     121                 :            :  *
     122                 :            :  * The first time this is called the name field will be set to foo0 and
     123                 :            :  * this function returns 0. If the name ends with a digit (e.g. cx18),
     124                 :            :  * then the name will be set to cx18-0 since cx180 would look really odd.
     125                 :            :  */
     126                 :            : int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
     127                 :            :                          atomic_t *instance);
     128                 :            : 
     129                 :            : /**
     130                 :            :  * v4l2_device_disconnect - Change V4L2 device state to disconnected.
     131                 :            :  *
     132                 :            :  * @v4l2_dev: pointer to struct v4l2_device
     133                 :            :  *
     134                 :            :  * Should be called when the USB parent disconnects.
     135                 :            :  * Since the parent disappears, this ensures that @v4l2_dev doesn't have
     136                 :            :  * an invalid parent pointer.
     137                 :            :  *
     138                 :            :  * .. note:: This function sets @v4l2_dev->dev to NULL.
     139                 :            :  */
     140                 :            : void v4l2_device_disconnect(struct v4l2_device *v4l2_dev);
     141                 :            : 
     142                 :            : /**
     143                 :            :  *  v4l2_device_unregister - Unregister all sub-devices and any other
     144                 :            :  *       resources related to @v4l2_dev.
     145                 :            :  *
     146                 :            :  * @v4l2_dev: pointer to struct v4l2_device
     147                 :            :  */
     148                 :            : void v4l2_device_unregister(struct v4l2_device *v4l2_dev);
     149                 :            : 
     150                 :            : /**
     151                 :            :  * v4l2_device_register_subdev - Registers a subdev with a v4l2 device.
     152                 :            :  *
     153                 :            :  * @v4l2_dev: pointer to struct &v4l2_device
     154                 :            :  * @sd: pointer to &struct v4l2_subdev
     155                 :            :  *
     156                 :            :  * While registered, the subdev module is marked as in-use.
     157                 :            :  *
     158                 :            :  * An error is returned if the module is no longer loaded on any attempts
     159                 :            :  * to register it.
     160                 :            :  */
     161                 :            : int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
     162                 :            :                                              struct v4l2_subdev *sd);
     163                 :            : 
     164                 :            : /**
     165                 :            :  * v4l2_device_unregister_subdev - Unregisters a subdev with a v4l2 device.
     166                 :            :  *
     167                 :            :  * @sd: pointer to &struct v4l2_subdev
     168                 :            :  *
     169                 :            :  * .. note ::
     170                 :            :  *
     171                 :            :  *      Can also be called if the subdev wasn't registered. In such
     172                 :            :  *      case, it will do nothing.
     173                 :            :  */
     174                 :            : void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
     175                 :            : 
     176                 :            : /**
     177                 :            :  * __v4l2_device_register_ro_subdev_nodes - Registers device nodes for
     178                 :            :  *      all subdevs of the v4l2 device that are marked with the
     179                 :            :  *      %V4L2_SUBDEV_FL_HAS_DEVNODE flag.
     180                 :            :  *
     181                 :            :  * @v4l2_dev: pointer to struct v4l2_device
     182                 :            :  * @read_only: subdevices read-only flag. True to register the subdevices
     183                 :            :  *      device nodes in read-only mode, false to allow full access to the
     184                 :            :  *      subdevice userspace API.
     185                 :            :  */
     186                 :            : int __must_check
     187                 :            : __v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev,
     188                 :            :                                     bool read_only);
     189                 :            : 
     190                 :            : /**
     191                 :            :  * v4l2_device_register_subdev_nodes - Registers subdevices device nodes with
     192                 :            :  *      unrestricted access to the subdevice userspace operations
     193                 :            :  *
     194                 :            :  * Internally calls __v4l2_device_register_subdev_nodes(). See its documentation
     195                 :            :  * for more details.
     196                 :            :  *
     197                 :            :  * @v4l2_dev: pointer to struct v4l2_device
     198                 :            :  */
     199                 :            : static inline int __must_check
     200                 :            : v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
     201                 :            : {
     202                 :            : #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
     203                 :            :         return __v4l2_device_register_subdev_nodes(v4l2_dev, false);
     204                 :            : #else
     205                 :            :         return 0;
     206                 :            : #endif
     207                 :            : }
     208                 :            : 
     209                 :            : /**
     210                 :            :  * v4l2_device_register_ro_subdev_nodes - Registers subdevices device nodes
     211                 :            :  *      in read-only mode
     212                 :            :  *
     213                 :            :  * Internally calls __v4l2_device_register_subdev_nodes(). See its documentation
     214                 :            :  * for more details.
     215                 :            :  *
     216                 :            :  * @v4l2_dev: pointer to struct v4l2_device
     217                 :            :  */
     218                 :            : static inline int __must_check
     219                 :            : v4l2_device_register_ro_subdev_nodes(struct v4l2_device *v4l2_dev)
     220                 :            : {
     221                 :            : #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
     222                 :            :         return __v4l2_device_register_subdev_nodes(v4l2_dev, true);
     223                 :            : #else
     224                 :            :         return 0;
     225                 :            : #endif
     226                 :            : }
     227                 :            : 
     228                 :            : /**
     229                 :            :  * v4l2_subdev_notify - Sends a notification to v4l2_device.
     230                 :            :  *
     231                 :            :  * @sd: pointer to &struct v4l2_subdev
     232                 :            :  * @notification: type of notification. Please notice that the notification
     233                 :            :  *      type is driver-specific.
     234                 :            :  * @arg: arguments for the notification. Those are specific to each
     235                 :            :  *      notification type.
     236                 :            :  */
     237                 :            : static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
     238                 :            :                                       unsigned int notification, void *arg)
     239                 :            : {
     240                 :          0 :         if (sd && sd->v4l2_dev && sd->v4l2_dev->notify)
     241                 :          0 :                 sd->v4l2_dev->notify(sd, notification, arg);
     242                 :            : }
     243                 :            : 
     244                 :            : /**
     245                 :            :  * v4l2_device_supports_requests - Test if requests are supported.
     246                 :            :  *
     247                 :            :  * @v4l2_dev: pointer to struct v4l2_device
     248                 :            :  */
     249                 :            : static inline bool v4l2_device_supports_requests(struct v4l2_device *v4l2_dev)
     250                 :            : {
     251                 :          3 :         return v4l2_dev->mdev && v4l2_dev->mdev->ops &&
     252                 :          0 :                v4l2_dev->mdev->ops->req_queue;
     253                 :            : }
     254                 :            : 
     255                 :            : /* Helper macros to iterate over all subdevs. */
     256                 :            : 
     257                 :            : /**
     258                 :            :  * v4l2_device_for_each_subdev - Helper macro that interates over all
     259                 :            :  *      sub-devices of a given &v4l2_device.
     260                 :            :  *
     261                 :            :  * @sd: pointer that will be filled by the macro with all
     262                 :            :  *      &struct v4l2_subdev pointer used as an iterator by the loop.
     263                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     264                 :            :  *
     265                 :            :  * This macro iterates over all sub-devices owned by the @v4l2_dev device.
     266                 :            :  * It acts as a for loop iterator and executes the next statement with
     267                 :            :  * the @sd variable pointing to each sub-device in turn.
     268                 :            :  */
     269                 :            : #define v4l2_device_for_each_subdev(sd, v4l2_dev)                       \
     270                 :            :         list_for_each_entry(sd, &(v4l2_dev)->subdevs, list)
     271                 :            : 
     272                 :            : /**
     273                 :            :  * __v4l2_device_call_subdevs_p - Calls the specified operation for
     274                 :            :  *      all subdevs matching the condition.
     275                 :            :  *
     276                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     277                 :            :  * @sd: pointer that will be filled by the macro with all
     278                 :            :  *      &struct v4l2_subdev pointer used as an iterator by the loop.
     279                 :            :  * @cond: condition to be match
     280                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     281                 :            :  *     Each element there groups a set of operations functions.
     282                 :            :  * @f: operation function that will be called if @cond matches.
     283                 :            :  *      The operation functions are defined in groups, according to
     284                 :            :  *      each element at &struct v4l2_subdev_ops.
     285                 :            :  * @args...: arguments for @f.
     286                 :            :  *
     287                 :            :  * Ignore any errors.
     288                 :            :  *
     289                 :            :  * Note: subdevs cannot be added or deleted while walking
     290                 :            :  * the subdevs list.
     291                 :            :  */
     292                 :            : #define __v4l2_device_call_subdevs_p(v4l2_dev, sd, cond, o, f, args...) \
     293                 :            :         do {                                                            \
     294                 :            :                 list_for_each_entry((sd), &(v4l2_dev)->subdevs, list)    \
     295                 :            :                         if ((cond) && (sd)->ops->o && (sd)->ops->o->f)   \
     296                 :            :                                 (sd)->ops->o->f((sd) , ##args);                \
     297                 :            :         } while (0)
     298                 :            : 
     299                 :            : /**
     300                 :            :  * __v4l2_device_call_subdevs - Calls the specified operation for
     301                 :            :  *      all subdevs matching the condition.
     302                 :            :  *
     303                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     304                 :            :  * @cond: condition to be match
     305                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     306                 :            :  *     Each element there groups a set of operations functions.
     307                 :            :  * @f: operation function that will be called if @cond matches.
     308                 :            :  *      The operation functions are defined in groups, according to
     309                 :            :  *      each element at &struct v4l2_subdev_ops.
     310                 :            :  * @args...: arguments for @f.
     311                 :            :  *
     312                 :            :  * Ignore any errors.
     313                 :            :  *
     314                 :            :  * Note: subdevs cannot be added or deleted while walking
     315                 :            :  * the subdevs list.
     316                 :            :  */
     317                 :            : #define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...)       \
     318                 :            :         do {                                                            \
     319                 :            :                 struct v4l2_subdev *__sd;                               \
     320                 :            :                                                                         \
     321                 :            :                 __v4l2_device_call_subdevs_p(v4l2_dev, __sd, cond, o,   \
     322                 :            :                                                 f , ##args);            \
     323                 :            :         } while (0)
     324                 :            : 
     325                 :            : /**
     326                 :            :  * __v4l2_device_call_subdevs_until_err_p - Calls the specified operation for
     327                 :            :  *      all subdevs matching the condition.
     328                 :            :  *
     329                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     330                 :            :  * @sd: pointer that will be filled by the macro with all
     331                 :            :  *      &struct v4l2_subdev sub-devices associated with @v4l2_dev.
     332                 :            :  * @cond: condition to be match
     333                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     334                 :            :  *     Each element there groups a set of operations functions.
     335                 :            :  * @f: operation function that will be called if @cond matches.
     336                 :            :  *      The operation functions are defined in groups, according to
     337                 :            :  *      each element at &struct v4l2_subdev_ops.
     338                 :            :  * @args...: arguments for @f.
     339                 :            :  *
     340                 :            :  * Return:
     341                 :            :  *
     342                 :            :  * If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
     343                 :            :  * for any subdevice, then abort and return with that error code, zero
     344                 :            :  * otherwise.
     345                 :            :  *
     346                 :            :  * Note: subdevs cannot be added or deleted while walking
     347                 :            :  * the subdevs list.
     348                 :            :  */
     349                 :            : #define __v4l2_device_call_subdevs_until_err_p(v4l2_dev, sd, cond, o, f, args...) \
     350                 :            : ({                                                                      \
     351                 :            :         long __err = 0;                                                 \
     352                 :            :                                                                         \
     353                 :            :         list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) {          \
     354                 :            :                 if ((cond) && (sd)->ops->o && (sd)->ops->o->f)           \
     355                 :            :                         __err = (sd)->ops->o->f((sd) , ##args);                \
     356                 :            :                 if (__err && __err != -ENOIOCTLCMD)                     \
     357                 :            :                         break;                                          \
     358                 :            :         }                                                               \
     359                 :            :         (__err == -ENOIOCTLCMD) ? 0 : __err;                            \
     360                 :            : })
     361                 :            : 
     362                 :            : /**
     363                 :            :  * __v4l2_device_call_subdevs_until_err - Calls the specified operation for
     364                 :            :  *      all subdevs matching the condition.
     365                 :            :  *
     366                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     367                 :            :  * @cond: condition to be match
     368                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     369                 :            :  *     Each element there groups a set of operations functions.
     370                 :            :  * @f: operation function that will be called if @cond matches.
     371                 :            :  *      The operation functions are defined in groups, according to
     372                 :            :  *      each element at &struct v4l2_subdev_ops.
     373                 :            :  * @args...: arguments for @f.
     374                 :            :  *
     375                 :            :  * Return:
     376                 :            :  *
     377                 :            :  * If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
     378                 :            :  * for any subdevice, then abort and return with that error code,
     379                 :            :  * zero otherwise.
     380                 :            :  *
     381                 :            :  * Note: subdevs cannot be added or deleted while walking
     382                 :            :  * the subdevs list.
     383                 :            :  */
     384                 :            : #define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \
     385                 :            : ({                                                                      \
     386                 :            :         struct v4l2_subdev *__sd;                                       \
     387                 :            :         __v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, cond, o, \
     388                 :            :                                                 f , ##args);            \
     389                 :            : })
     390                 :            : 
     391                 :            : /**
     392                 :            :  * v4l2_device_call_all - Calls the specified operation for
     393                 :            :  *      all subdevs matching the &v4l2_subdev.grp_id, as assigned
     394                 :            :  *      by the bridge driver.
     395                 :            :  *
     396                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     397                 :            :  * @grpid: &struct v4l2_subdev->grp_id group ID to match.
     398                 :            :  *          Use 0 to match them all.
     399                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     400                 :            :  *     Each element there groups a set of operations functions.
     401                 :            :  * @f: operation function that will be called if @cond matches.
     402                 :            :  *      The operation functions are defined in groups, according to
     403                 :            :  *      each element at &struct v4l2_subdev_ops.
     404                 :            :  * @args...: arguments for @f.
     405                 :            :  *
     406                 :            :  * Ignore any errors.
     407                 :            :  *
     408                 :            :  * Note: subdevs cannot be added or deleted while walking
     409                 :            :  * the subdevs list.
     410                 :            :  */
     411                 :            : #define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...)            \
     412                 :            :         do {                                                            \
     413                 :            :                 struct v4l2_subdev *__sd;                               \
     414                 :            :                                                                         \
     415                 :            :                 __v4l2_device_call_subdevs_p(v4l2_dev, __sd,            \
     416                 :            :                         (grpid) == 0 || __sd->grp_id == (grpid), o, f ,      \
     417                 :            :                         ##args);                                        \
     418                 :            :         } while (0)
     419                 :            : 
     420                 :            : /**
     421                 :            :  * v4l2_device_call_until_err - Calls the specified operation for
     422                 :            :  *      all subdevs matching the &v4l2_subdev.grp_id, as assigned
     423                 :            :  *      by the bridge driver, until an error occurs.
     424                 :            :  *
     425                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     426                 :            :  * @grpid: &struct v4l2_subdev->grp_id group ID to match.
     427                 :            :  *         Use 0 to match them all.
     428                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     429                 :            :  *     Each element there groups a set of operations functions.
     430                 :            :  * @f: operation function that will be called if @cond matches.
     431                 :            :  *      The operation functions are defined in groups, according to
     432                 :            :  *      each element at &struct v4l2_subdev_ops.
     433                 :            :  * @args...: arguments for @f.
     434                 :            :  *
     435                 :            :  * Return:
     436                 :            :  *
     437                 :            :  * If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
     438                 :            :  * for any subdevice, then abort and return with that error code,
     439                 :            :  * zero otherwise.
     440                 :            :  *
     441                 :            :  * Note: subdevs cannot be added or deleted while walking
     442                 :            :  * the subdevs list.
     443                 :            :  */
     444                 :            : #define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...)      \
     445                 :            : ({                                                                      \
     446                 :            :         struct v4l2_subdev *__sd;                                       \
     447                 :            :         __v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd,          \
     448                 :            :                         (grpid) == 0 || __sd->grp_id == (grpid), o, f ,      \
     449                 :            :                         ##args);                                        \
     450                 :            : })
     451                 :            : 
     452                 :            : /**
     453                 :            :  * v4l2_device_mask_call_all - Calls the specified operation for
     454                 :            :  *      all subdevices where a group ID matches a specified bitmask.
     455                 :            :  *
     456                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     457                 :            :  * @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id
     458                 :            :  *          group ID to be matched. Use 0 to match them all.
     459                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     460                 :            :  *     Each element there groups a set of operations functions.
     461                 :            :  * @f: operation function that will be called if @cond matches.
     462                 :            :  *      The operation functions are defined in groups, according to
     463                 :            :  *      each element at &struct v4l2_subdev_ops.
     464                 :            :  * @args...: arguments for @f.
     465                 :            :  *
     466                 :            :  * Ignore any errors.
     467                 :            :  *
     468                 :            :  * Note: subdevs cannot be added or deleted while walking
     469                 :            :  * the subdevs list.
     470                 :            :  */
     471                 :            : #define v4l2_device_mask_call_all(v4l2_dev, grpmsk, o, f, args...)      \
     472                 :            :         do {                                                            \
     473                 :            :                 struct v4l2_subdev *__sd;                               \
     474                 :            :                                                                         \
     475                 :            :                 __v4l2_device_call_subdevs_p(v4l2_dev, __sd,            \
     476                 :            :                         (grpmsk) == 0 || (__sd->grp_id & (grpmsk)), o,   \
     477                 :            :                         f , ##args);                                    \
     478                 :            :         } while (0)
     479                 :            : 
     480                 :            : /**
     481                 :            :  * v4l2_device_mask_call_until_err - Calls the specified operation for
     482                 :            :  *      all subdevices where a group ID matches a specified bitmask.
     483                 :            :  *
     484                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     485                 :            :  * @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id
     486                 :            :  *          group ID to be matched. Use 0 to match them all.
     487                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     488                 :            :  *     Each element there groups a set of operations functions.
     489                 :            :  * @f: operation function that will be called if @cond matches.
     490                 :            :  *      The operation functions are defined in groups, according to
     491                 :            :  *      each element at &struct v4l2_subdev_ops.
     492                 :            :  * @args...: arguments for @f.
     493                 :            :  *
     494                 :            :  * Return:
     495                 :            :  *
     496                 :            :  * If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
     497                 :            :  * for any subdevice, then abort and return with that error code,
     498                 :            :  * zero otherwise.
     499                 :            :  *
     500                 :            :  * Note: subdevs cannot be added or deleted while walking
     501                 :            :  * the subdevs list.
     502                 :            :  */
     503                 :            : #define v4l2_device_mask_call_until_err(v4l2_dev, grpmsk, o, f, args...) \
     504                 :            : ({                                                                      \
     505                 :            :         struct v4l2_subdev *__sd;                                       \
     506                 :            :         __v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd,          \
     507                 :            :                         (grpmsk) == 0 || (__sd->grp_id & (grpmsk)), o,   \
     508                 :            :                         f , ##args);                                    \
     509                 :            : })
     510                 :            : 
     511                 :            : 
     512                 :            : /**
     513                 :            :  * v4l2_device_has_op - checks if any subdev with matching grpid has a
     514                 :            :  *      given ops.
     515                 :            :  *
     516                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     517                 :            :  * @grpid: &struct v4l2_subdev->grp_id group ID to match.
     518                 :            :  *         Use 0 to match them all.
     519                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     520                 :            :  *     Each element there groups a set of operations functions.
     521                 :            :  * @f: operation function that will be called if @cond matches.
     522                 :            :  *      The operation functions are defined in groups, according to
     523                 :            :  *      each element at &struct v4l2_subdev_ops.
     524                 :            :  */
     525                 :            : #define v4l2_device_has_op(v4l2_dev, grpid, o, f)                       \
     526                 :            : ({                                                                      \
     527                 :            :         struct v4l2_subdev *__sd;                                       \
     528                 :            :         bool __result = false;                                          \
     529                 :            :         list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) {          \
     530                 :            :                 if ((grpid) && __sd->grp_id != (grpid))                      \
     531                 :            :                         continue;                                       \
     532                 :            :                 if (v4l2_subdev_has_op(__sd, o, f)) {                   \
     533                 :            :                         __result = true;                                \
     534                 :            :                         break;                                          \
     535                 :            :                 }                                                       \
     536                 :            :         }                                                               \
     537                 :            :         __result;                                                       \
     538                 :            : })
     539                 :            : 
     540                 :            : /**
     541                 :            :  * v4l2_device_mask_has_op - checks if any subdev with matching group
     542                 :            :  *      mask has a given ops.
     543                 :            :  *
     544                 :            :  * @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
     545                 :            :  * @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id
     546                 :            :  *          group ID to be matched. Use 0 to match them all.
     547                 :            :  * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
     548                 :            :  *     Each element there groups a set of operations functions.
     549                 :            :  * @f: operation function that will be called if @cond matches.
     550                 :            :  *      The operation functions are defined in groups, according to
     551                 :            :  *      each element at &struct v4l2_subdev_ops.
     552                 :            :  */
     553                 :            : #define v4l2_device_mask_has_op(v4l2_dev, grpmsk, o, f)                 \
     554                 :            : ({                                                                      \
     555                 :            :         struct v4l2_subdev *__sd;                                       \
     556                 :            :         bool __result = false;                                          \
     557                 :            :         list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) {          \
     558                 :            :                 if ((grpmsk) && !(__sd->grp_id & (grpmsk)))              \
     559                 :            :                         continue;                                       \
     560                 :            :                 if (v4l2_subdev_has_op(__sd, o, f)) {                   \
     561                 :            :                         __result = true;                                \
     562                 :            :                         break;                                          \
     563                 :            :                 }                                                       \
     564                 :            :         }                                                               \
     565                 :            :         __result;                                                       \
     566                 :            : })
     567                 :            : 
     568                 :            : #endif
    

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