nsc_gpio.h

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struct nsc_gpio_ops {
    struct module*  owner;
    u32 (*gpio_config)  (unsigned iminor, u32 mask, u32 bits);
    void    (*gpio_dump)    (struct nsc_gpio_ops *amp, unsigned iminor);
    int (*gpio_get) (unsigned iminor);
    void    (*gpio_set) (unsigned iminor, int state);
    void    (*gpio_change)  (unsigned iminor);
    int (*gpio_current) (unsigned iminor);
    struct device*  dev;    /* for dev_dbg() support, set in init  */
};

extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
                  size_t len, loff_t *ppos);

extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
                 size_t len, loff_t *ppos);

extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);