root/include/linux/platform_data/pca953x.h

#ifndef _LINUX_PCA953X_H
#define _LINUX_PCA953X_H

#include <linux/types.h>
#include <linux/i2c.h>

/* platform data for the PCA9539 16-bit I/O expander driver */

struct pca953x_platform_data {
        /* number of the first GPIO */
        unsigned        gpio_base;

        /* initial polarity inversion setting */
        u32             invert;

        /* interrupt base */
        int             irq_base;

        void            *context;       /* param to setup/teardown */

        int             (*setup)(struct i2c_client *client,
                                unsigned gpio, unsigned ngpio,
                                void *context);
        int             (*teardown)(struct i2c_client *client,
                                unsigned gpio, unsigned ngpio,
                                void *context);
        const char      *const *names;
};

#endif /* _LINUX_PCA953X_H */