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 if populated */
   6         unsigned        pullups;        /* BIT(x) means enable pullup x */
   7 };
   8
   9 struct mcp23s08_platform_data {
  10         /* For mcp23s08, up to 4 slaves (numbered 0..3) can share one SPI
  11          * chipselect, each providing 1 gpio_chip instance with 8 gpios.
  12          * For mpc23s17, up to 8 slaves (numbered 0..7) can share one SPI
  13          * chipselect, each providing 1 gpio_chip (port A + port B) with
  14          * 16 gpios.
  15          */
  16         struct mcp23s08_chip_info       chip[8];
  17
  18         /* "base" is the number of the first GPIO.  Dynamic assignment is
  19          * not currently supported, and even if there are gaps in chip
  20          * addressing the GPIO numbers are sequential .. so for example
  21          * if only slaves 0 and 3 are present, their GPIOs range from
  22          * base to base+15 (or base+31 for s17 variant).
  23          */
  24         unsigned        base;
  25
  26         void            *context;       /* param to setup/teardown */
  27
  28         int             (*setup)(struct spi_device *spi,
  29                                         int gpio, unsigned ngpio,
  30                                         void *context);
  31         int             (*teardown)(struct spi_device *spi,
  32                                         int gpio, unsigned ngpio,
  33                                         void *context);
  34 };