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 * arch/arm/include/asm/mach/udc_pxa2xx.h
 * This supports machine-specific differences in how the PXA2xx
 * USB Device Controller (UDC) is wired.
 * It is set in linux/arch/arm/mach-pxa/<machine>.c or in
 * linux/arch/mach-ixp4xx/<machine>.c and used in
 * the probe routine of linux/drivers/usb/gadget/pxa2xx_udc.c

struct pxa2xx_udc_mach_info {
        int  (*udc_is_connected)(void);         /* do we see host? */
        void (*udc_command)(int cmd);
#define     PXA2XX_UDC_CMD_CONNECT        0     /* let host see us */
#define     PXA2XX_UDC_CMD_DISCONNECT     1     /* so host won't see us */

      /* Boards following the design guidelines in the developer's manual,
       * with on-chip GPIOs not Lubbock's weird hardware, can have a sane
       * VBUS IRQ and omit the methods above.  Store the GPIO number
       * here; for GPIO 0, also mask in one of the pxa_gpio_mode() bits.
       * Note that sometimes the signals go through inverters...
      bool  gpio_vbus_inverted;
      u16   gpio_vbus;              /* high == vbus present */
      bool  gpio_pullup_inverted;
      u16   gpio_pullup;                  /* high == pullup activated */

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