channel_range.h

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#ifndef _COBALT_RTDM_ANALOGY_CHANNEL_RANGE_H
#define _COBALT_RTDM_ANALOGY_CHANNEL_RANGE_H
 
#include <rtdm/uapi/analogy.h>
 
/* --- Channel section --- */
 
#define A4L_CHAN_AREF_GROUND 0x1
#define A4L_CHAN_AREF_COMMON 0x2
#define A4L_CHAN_AREF_DIFF 0x4
#define A4L_CHAN_AREF_OTHER 0x8
 
#define A4L_CHAN_GLOBAL 0x10
 
struct a4l_channel {
        unsigned long flags; 
        unsigned long nb_bits; 
};
 
#define A4L_CHAN_GLOBAL_CHANDESC 0
#define A4L_CHAN_PERCHAN_CHANDESC 1
 
struct a4l_channels_desc {
        unsigned long mode; 
        unsigned long length; 
        struct a4l_channel chans[]; 
};
 
#define A4L_RNG_GLOBAL 0x8
 
struct a4l_range {
        long min; 
        long max; 
        unsigned long flags; 
};
 
#define RANGE(x,y) {(x * A4L_RNG_FACTOR), (y * A4L_RNG_FACTOR), \
                        A4L_RNG_NO_UNIT}
#define RANGE_V(x,y) {(x * A4L_RNG_FACTOR),(y * A4L_RNG_FACTOR), \
                        A4L_RNG_VOLT_UNIT}
#define RANGE_mA(x,y) {(x * A4L_RNG_FACTOR),(y * A4L_RNG_FACTOR), \
                        A4L_RNG_MAMP_UNIT}
#define RANGE_ext(x,y) {(x * A4L_RNG_FACTOR),(y * A4L_RNG_FACTOR), \
                        A4L_RNG_EXT_UNIT}
 
 
/* Ranges tab descriptor */
struct a4l_rngtab {
        unsigned char length;
        struct a4l_range rngs[];
};
 
#define A4L_RNG_GLOBAL_RNGDESC 0
#define A4L_RNG_PERCHAN_RNGDESC 1
 
/* Global ranges descriptor */
struct a4l_rngdesc {
        unsigned char mode;
        unsigned char length;
        struct a4l_rngtab *rngtabs[];
};
 
#define RNG_GLOBAL(x) {                 \
        .mode = A4L_RNG_GLOBAL_RNGDESC, \
        .length =  1,                   \
        .rngtabs = {&(x)},              \
}
 
extern struct a4l_rngdesc a4l_range_bipolar10;
extern struct a4l_rngdesc a4l_range_bipolar5;
extern struct a4l_rngdesc a4l_range_unipolar10;
extern struct a4l_rngdesc a4l_range_unipolar5;
extern struct a4l_rngdesc a4l_range_unknown;
extern struct a4l_rngdesc a4l_range_fake;
 
#define range_digital a4l_range_unipolar5
 
#endif /* !_COBALT_RTDM_ANALOGY_CHANNEL_RANGE_H */