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 */
21struct 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 */
40struct 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
54

source code of linux/include/linux/platform_data/gpio-htc-egpio.h