include/linux/mfd/htc-egpio.h

   1 /*
   2  * HTC simple EGPIO irq and gpio extender
   3  */
   4
   5 #ifndef __HTC_EGPIO_H__
   6 #define __HTC_EGPIO_H__
   7
   8 #include <linux/gpio.h>
   9
  10 /* Descriptive values for all-in or all-out htc_egpio_chip descriptors. */
  11 #define HTC_EGPIO_OUTPUT (~0)
  12 #define HTC_EGPIO_INPUT  0
  13
  14 /**
  15  * struct htc_egpio_chip - descriptor to create gpio_chip for register range
  16  * @reg_start: index of first register
  17  * @gpio_base: gpio number of first pin in this register range
  18  * @num_gpios: number of gpios in this register range, max BITS_PER_LONG
  19  *    (number of registers = DIV_ROUND_UP(num_gpios, reg_width))
  20  * @direction: bitfield, '0' = input, '1' = output,
  21  */
  22 struct htc_egpio_chip {
  23         int           reg_start;
  24         int           gpio_base;
  25         int           num_gpios;
  26         unsigned long direction;
  27         unsigned long initial_values;
  28 };
  29
  30 /**
  31  * struct htc_egpio_platform_data - description provided by the arch
  32  * @irq_base: beginning of available IRQs (eg, IRQ_BOARD_START)
  33  * @num_irqs: number of irqs
  34  * @reg_width: number of bits per register, either 8 or 16 bit
  35  * @bus_width: alignment of the registers, either 16 or 32 bit
  36  * @invert_acks: set if chip requires writing '0' to ack an irq, instead of '1'
  37  * @ack_register: location of the irq/ack register
  38  * @chip: pointer to array of htc_egpio_chip descriptors
  39  * @num_chips: number of egpio chip descriptors
  40  */
  41 struct htc_egpio_platform_data {
  42         int                   bus_width;
  43         int                   reg_width;
  44
  45         int                   irq_base;
  46         int                   num_irqs;
  47         int                   invert_acks;
  48         int                   ack_register;
  49
  50         struct htc_egpio_chip *chip;
  51         int                   num_chips;
  52 };
  53
  54 /* Determine the wakeup irq, to be called during early resume */
  55 extern int htc_egpio_get_wakeup_irq(struct device *dev);
  56
  57 #endif