ctresource.h

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#ifndef CTRESOURCE_H
#define CTRESOURCE_H

#include <linux/types.h>

enum RSCTYP {
    SRC,
    SRCIMP,
    AMIXER,
    SUM,
    DAIO,
    NUM_RSCTYP  /* This must be the last one and less than 16 */
};

struct rsc_ops;

struct rsc {
    u32 idx:12; /* The index of a resource */
    u32 type:4; /* The type (RSCTYP) of a resource */
    u32 conj:12;    /* Current conjugate index */
    u32 msr:4;  /* The Master Sample Rate a resource working on */
    void *ctrl_blk; /* Chip specific control info block for a resource */
    void *hw;   /* Chip specific object for hardware access means */
    struct rsc_ops *ops;    /* Generic resource operations */
};

struct rsc_ops {
    int (*master)(struct rsc *rsc); /* Move to master resource */
    int (*next_conj)(struct rsc *rsc); /* Move to next conjugate resource */
    int (*index)(const struct rsc *rsc); /* Return the index of resource */
    /* Return the output slot number */
    int (*output_slot)(const struct rsc *rsc);
};

int rsc_init(struct rsc *rsc, u32 idx, enum RSCTYP type, u32 msr, void *hw);
int rsc_uninit(struct rsc *rsc);

struct rsc_mgr {
    enum RSCTYP type; /* The type (RSCTYP) of resource to manage */
    unsigned int amount; /* The total amount of a kind of resource */
    unsigned int avail; /* The amount of currently available resources */
    unsigned char *rscs; /* The bit-map for resource allocation */
    void *ctrl_blk; /* Chip specific control info block */
    void *hw; /* Chip specific object for hardware access */
};

/* Resource management is based on bit-map mechanism */
int rsc_mgr_init(struct rsc_mgr *mgr, enum RSCTYP type,
         unsigned int amount, void *hw);
int rsc_mgr_uninit(struct rsc_mgr *mgr);
int mgr_get_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int *ridx);
int mgr_put_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int idx);

#endif /* CTRESOURCE_H */