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