root/include/linux/spi/mmc_spi.h

#ifndef __LINUX_SPI_MMC_SPI_H
#define __LINUX_SPI_MMC_SPI_H

#include <linux/interrupt.h>

struct device;
struct mmc_host;

/* Put this in platform_data of a device being used to manage an MMC/SD
 * card slot.  (Modeled after PXA mmc glue; see that for usage examples.)
 *
 * REVISIT This is not a spi-specific notion.  Any card slot should be
 * able to handle it.  If the MMC core doesn't adopt this kind of notion,
 * switch the "struct device *" parameters over to "struct spi_device *".
 */
struct mmc_spi_platform_data {
        /* driver activation and (optional) card detect irq hookup */
        int (*init)(struct device *,
                irqreturn_t (*)(int, void *),
                void *);
        void (*exit)(struct device *, void *);

        /* sense switch on sd cards */
        int (*get_ro)(struct device *);

        /*
         * If board does not use CD interrupts, driver can optimize polling
         * using this function.
         */
        int (*get_cd)(struct device *);

        /* Capabilities to pass into mmc core (e.g. MMC_CAP_NEEDS_POLL). */
        unsigned long caps;

        /* how long to debounce card detect, in msecs */
        u16 detect_delay;

        /* power management */
        u16 powerup_msecs;              /* delay of up to 250 msec */
        u32 ocr_mask;                   /* available voltages */
        void (*setpower)(struct device *, unsigned int maskval);
};

#endif /* __LINUX_SPI_MMC_SPI_H */