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 */
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 */
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#ifndef KERN_CHARDEV_H_
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#ifndef KERN_CHARDEV_H_
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#define KERN_CHARDEV_H_
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#define KERN_CHARDEV_H_
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#include <typedefs.h>
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#include <arch/types.h>
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#include <arch/types.h>
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#include <synch/waitq.h>
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#include <synch/waitq.h>
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#include <synch/spinlock.h>
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#include <synch/spinlock.h>
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#define CHARDEV_BUFLEN 512
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#define CHARDEV_BUFLEN 512
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struct chardev;
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/* Character device operations interface. */
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/* Character device operations interface. */
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struct chardev_operations {
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typedef struct {
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    void (* suspend)(chardev_t *);      /**< Suspend pushing characters. */
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    void (* suspend)(struct chardev *);     /**< Suspend pushing characters. */
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    void (* resume)(chardev_t *);       /**< Resume pushing characters. */
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    void (* resume)(struct chardev *);      /**< Resume pushing characters. */
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    void (* write)(chardev_t *, char c);    /**< Write character to stream. */
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    void (* write)(struct chardev *, char c);   /**< Write character to stream. */
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    /** Read character directly from device, assume interrupts disabled */
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    /** Read character directly from device, assume interrupts disabled */
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    char (* read)(chardev_t *);
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    char (* read)(struct chardev *);
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};
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typedef struct chardev_operations chardev_operations_t;
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} chardev_operations_t;
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/** Character input device. */
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/** Character input device. */
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struct chardev {
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typedef struct chardev {
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    char *name;
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    char *name;
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    waitq_t wq;
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    waitq_t wq;
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    SPINLOCK_DECLARE(lock);     /**< Protects everything below. */
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    SPINLOCK_DECLARE(lock);     /**< Protects everything below. */
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    uint8_t buffer[CHARDEV_BUFLEN];
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    uint8_t buffer[CHARDEV_BUFLEN];
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    count_t counter;
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    count_t counter;
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    chardev_operations_t *op;   /**< Implementation of chardev operations. */
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    chardev_operations_t *op;   /**< Implementation of chardev operations. */
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    index_t index;
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    index_t index;
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    void *data;
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    void *data;
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};
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} chardev_t;
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extern void chardev_initialize(char *name,
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extern void chardev_initialize(char *name,
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                   chardev_t *chardev,
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                   chardev_t *chardev,
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                   chardev_operations_t *op);
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                   chardev_operations_t *op);
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extern void chardev_push_character(chardev_t *chardev, uint8_t ch);
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extern void chardev_push_character(chardev_t *chardev, uint8_t ch);