root/include/linux/spi/max7301.h

#ifndef LINUX_SPI_MAX7301_H
#define LINUX_SPI_MAX7301_H

#include <linux/gpio.h>

/*
 * Some registers must be read back to modify.
 * To save time we cache them here in memory
 */
struct max7301 {
        struct mutex    lock;
        u8              port_config[8]; /* field 0 is unused */
        u32             out_level;      /* cached output levels */
        u32             input_pullup_active;
        struct gpio_chip chip;
        struct device *dev;
        int (*write)(struct device *dev, unsigned int reg, unsigned int val);
        int (*read)(struct device *dev, unsigned int reg);
};

struct max7301_platform_data {
        /* number assigned to the first GPIO */
        unsigned        base;
        /*
         * bitmask controlling the pullup configuration,
         *
         * _note_ the 4 lowest bits are unused, because the first 4
         * ports of the controller are not used, too.
         */
        u32             input_pullup_active;
};

extern int __max730x_remove(struct device *dev);
extern int __max730x_probe(struct max7301 *ts);
#endif