include/analogy/context.h

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#ifndef __ANALOGY_CONTEXT__
#define __ANALOGY_CONTEXT__

#if defined(__KERNEL__) && !defined(DOXYGEN_CPP)

#include <rtdm/rtdm_driver.h>

struct a4l_device;
struct a4l_buffer;

struct a4l_device_context {

        /* Needed to call rtdm_*_copy_from/to_user functions */
        rtdm_user_info_t *user_info;

        /* The adequate device pointer
           (retrieved thanks to minor at open time) */
        struct a4l_device *dev;

        /* The buffer structure contains everything to transfer data
           from asynchronous acquisition operations on a specific
           subdevice */
        struct a4l_buffer *buffer;
};
typedef struct a4l_device_context a4l_cxt_t;

static inline int a4l_get_minor(a4l_cxt_t *cxt)
{
        /* Get a pointer on the container structure */
        struct rtdm_dev_context * rtdm_cxt = rtdm_private_to_context(cxt);
        /* Get the minor index */
        return rtdm_cxt->device->device_id;
}

#endif /* __KERNEL__ && !DOXYGEN_CPP */

#endif /* __ANALOGY_CONTEXT__ */