include/linux/platform_data/gpio-htc-egpio.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * HTC simple EGPIO irq and gpio extender
   4  */
   5
   6 #ifndef __HTC_EGPIO_H__
   7 #define __HTC_EGPIO_H__
   8
   9 /* Descriptive values for all-in or all-out htc_egpio_chip descriptors. */
  10 #define HTC_EGPIO_OUTPUT (~0)
  11 #define HTC_EGPIO_INPUT  0
  12
  13 /**
  14  * struct htc_egpio_chip - descriptor to create gpio_chip for register range
  15  * @reg_start: index of first register
  16  * @gpio_base: gpio number of first pin in this register range
  17  * @num_gpios: number of gpios in this register range, max BITS_PER_LONG
  18  *    (number of registers = DIV_ROUND_UP(num_gpios, reg_width))
  19  * @direction: bitfield, '0' = input, '1' = output,
  20  */
  21 struct htc_egpio_chip {
  22         int           reg_start;
  23         int           gpio_base;
  24         int           num_gpios;
  25         unsigned long direction;
  26         unsigned long initial_values;
  27 };
  28
  29 /**
  30  * struct htc_egpio_platform_data - description provided by the arch
  31  * @irq_base: beginning of available IRQs (eg, IRQ_BOARD_START)
  32  * @num_irqs: number of irqs
  33  * @reg_width: number of bits per register, either 8 or 16 bit
  34  * @bus_width: alignment of the registers, either 16 or 32 bit
  35  * @invert_acks: set if chip requires writing '0' to ack an irq, instead of '1'
  36  * @ack_register: location of the irq/ack register
  37  * @chip: pointer to array of htc_egpio_chip descriptors
  38  * @num_chips: number of egpio chip descriptors
  39  */
  40 struct htc_egpio_platform_data {
  41         int                   bus_width;
  42         int                   reg_width;
  43
  44         int                   irq_base;
  45         int                   num_irqs;
  46         int                   invert_acks;
  47         int                   ack_register;
  48
  49         struct htc_egpio_chip *chip;
  50         int                   num_chips;
  51 };
  52
  53 #endif