include/linux/spi/mcp23s08.h

   1
   2 /* FIXME driver should be able to handle IRQs...  */
   3
   4 struct mcp23s08_chip_info {
   5         bool    is_present;             /* true iff populated */
   6         u8      pullups;                /* BIT(x) means enable pullup x */
   7 };
   8
   9 struct mcp23s08_platform_data {
  10         /* Four slaves (numbered 0..3) can share one SPI chipselect, and
  11          * will provide 8..32 GPIOs using 1..4 gpio_chip instances.
  12          */
  13         struct mcp23s08_chip_info       chip[4];
  14
  15         /* "base" is the number of the first GPIO.  Dynamic assignment is
  16          * not currently supported, and even if there are gaps in chip
  17          * addressing the GPIO numbers are sequential .. so for example
  18          * if only slaves 0 and 3 are present, their GPIOs range from
  19          * base to base+15.
  20          */
  21         unsigned        base;
  22
  23         void            *context;       /* param to setup/teardown */
  24
  25         int             (*setup)(struct spi_device *spi,
  26                                         int gpio, unsigned ngpio,
  27                                         void *context);
  28         int             (*teardown)(struct spi_device *spi,
  29                                         int gpio, unsigned ngpio,
  30                                         void *context);
  31 };