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#ifndef _GPIO_HEADER_INCLUDED_
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#define _GPIO_HEADER_INCLUDED_
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#include <linux/list.h>
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#include "drivers/compbttv.h"
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#include <sys/types.h>
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/* base "class" for dispatch requests */
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struct gpio_request {
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    struct list_head list;          /* linked list of requests */
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};
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/* request queues */
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typedef struct _request_queue_s {
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    struct list_head list;          /* list of pending requests */
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} request_queue_t;
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#define init_request_queue(rq)                                  \
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do {                                                            \
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    INIT_LIST_HEAD(&((rq)->list));                              \
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} while(0)
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struct gpio_adapter {
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    /* overlapped data members: see "struct bttv" */
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    struct pci_dev *dev;
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    unsigned char *bt848_mem; /* pointer to mapped IO memory */
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    /* gpio async management variables */
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    unsigned long state;    //GPIO_HW_LOCKED   == someone has exclusive hw access
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                            //GPIO_ASYNC_MOD   == change is pending
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                            //GPIO_TASK_ACTIVE == request service task running
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    __u32 sync_bits;      // current sync state (when hardware not locked)
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    __u32 async_mask;     // mask of bits allocated to async control
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    __u32 async_bits;     // current (or pending) state.  see: async_change
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    /* gpio sync management variables */
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    request_queue_t request_queue;
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    request_queue_t free_queue;
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    void *private_data;
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};
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extern void init_gpio_adapter ( struct gpio_adapter * );
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/* gpio state bits */
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#define GPIO_HW_LOCKED      0
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#define GPIO_ASYNC_MOD      1
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#define GPIO_TASK_ACTIVE    2
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#define GPIO_USER_STATE     3       /* the base for user defined status */
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/* gpio async methods */
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extern void gpio_set   ( struct gpio_adapter *, __u32 data );
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extern void gpio_and   ( struct gpio_adapter *, __u32 and_data );
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extern void gpio_or    ( struct gpio_adapter *, __u32 or_data );
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extern void gpio_andor ( struct gpio_adapter *, __u32 and_data, __u32 or_data );
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/* request queueing methods */
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extern void gpio_commit_request( struct gpio_adapter *, struct gpio_request * );
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extern void gpio_commit_transaction( struct gpio_adapter *, struct list_head * );
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#endif /* _GPIO_HEADER_INCLUDED_ */