channel_range.h

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#ifndef __ANALOGY_CHANNEL_RANGE__
#define __ANALOGY_CHANNEL_RANGE__

#if __GNUC__ >= 3
#define GCC_ZERO_LENGTH_ARRAY
#else
#define GCC_ZERO_LENGTH_ARRAY 0
#endif

/* --- 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; 
};
typedef struct a4l_channel a4l_chan_t;

#define A4L_CHAN_GLOBAL_CHANDESC 0

#define A4L_CHAN_PERCHAN_CHANDESC 1

struct a4l_channels_desc {
        unsigned long mode; 
        unsigned long length; 
        a4l_chan_t chans[GCC_ZERO_LENGTH_ARRAY]; 
};
typedef struct a4l_channels_desc a4l_chdesc_t;

/* --- Range section --- */

#define A4L_RNG_FACTOR 1000000

#define A4L_RNG_VOLT_UNIT 0x0

#define A4L_RNG_MAMP_UNIT 0x1

#define A4L_RNG_NO_UNIT 0x2

#define A4L_RNG_EXT_UNIT 0x4

#define A4L_RNG_UNIT(x) (x & (A4L_RNG_VOLT_UNIT |       \
                              A4L_RNG_MAMP_UNIT |       \
                              A4L_RNG_NO_UNIT |         \
                              A4L_RNG_EXT_UNIT))

#define A4L_RNG_GLOBAL 0x8

struct a4l_range {
        long min; 
        long max; 
        unsigned long flags; 
};
typedef struct a4l_range a4l_rng_t;

#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 */
#define A4L_RNGTAB(x)                           \
        struct {                                \
                unsigned char length;           \
                a4l_rng_t rngs[x];              \
        }
typedef A4L_RNGTAB(GCC_ZERO_LENGTH_ARRAY) a4l_rngtab_t;

#define A4L_RNG_GLOBAL_RNGDESC 0

#define A4L_RNG_PERCHAN_RNGDESC 1

/* Global ranges descriptor */
#define A4L_RNGDESC(x)                          \
        struct {                                \
                unsigned char mode;             \
                unsigned char length;           \
                a4l_rngtab_t *rngtabs[x];       \
        }
typedef A4L_RNGDESC(GCC_ZERO_LENGTH_ARRAY) a4l_rngdesc_t;

#define RNG_GLOBAL(x) {                         \
        .mode = A4L_RNG_GLOBAL_RNGDESC,         \
        .length =  1,                           \
        .rngtabs = {&(x)}, }

extern a4l_rngdesc_t a4l_range_bipolar10;
extern a4l_rngdesc_t a4l_range_bipolar5;
extern a4l_rngdesc_t a4l_range_unipolar10;
extern a4l_rngdesc_t a4l_range_unipolar5;
extern a4l_rngdesc_t a4l_range_unknown;
extern a4l_rngdesc_t a4l_range_fake;

#define range_digital a4l_range_unipolar5

#endif /* __ANALOGY_CHANNEL_RANGE__ */