struct v4l2_m2m_ops
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## Name

struct v4l2_m2m_ops — mem-to-mem device driver callbacks

## Synopsis

    struct v4l2_m2m_ops {
      void (* device_run) (void *priv);
      int (* job_ready) (void *priv);
      void (* job_abort) (void *priv);
      void (* lock) (void *priv);
      void (* unlock) (void *priv);
    };

## Members

device_run

  required. Begin the actual job (transaction) inside this callback. The job does NOT have to end before this callback returns (and it will be the usual case). When the job finishes, `v4l2_m2m_job_finish` has to be called.

job_ready

  optional. Should return 0 if the driver does not have a job fully prepared to run yet (i.e. it will not be able to finish a transaction without sleeping). If not provided, it will be assumed that one source and one destination buffer are all that is required for the driver to perform one full transaction. This method may not sleep.

job_abort

  required. Informs the driver that it has to abort the currently running transaction as soon as possible (i.e. as soon as it can stop the device safely; e.g. in the next interrupt handler), even if the transaction would not have been finished by then. After the driver performs the necessary steps, it has to call `v4l2_m2m_job_finish` (as if the transaction ended normally). This function does not have to (and will usually not) wait until the device enters a state when it can be stopped.

lock

  optional. Define a driver's own lock callback, instead of using m2m_ctx->q_lock.

unlock

  optional. Define a driver's own unlock callback, instead of using m2m_ctx->q_lock.

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