src/devices/board/drivers/astro/astro-buttons.cc

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <lib/ddk/binding.h>
#include <lib/ddk/debug.h>
#include <lib/ddk/device.h>
#include <lib/ddk/metadata.h>
#include <lib/ddk/platform-defs.h>

#include <ddk/metadata/buttons.h>
#include <soc/aml-s905d2/s905d2-gpio.h>
#include <soc/aml-s905d2/s905d2-hw.h>

#include "astro-gpios.h"
#include "astro.h"
#include "src/devices/board/drivers/astro/astro-buttons-bind.h"

namespace astro {

// clang-format off
static const buttons_button_config_t buttons[] = {
    {BUTTONS_TYPE_DIRECT, BUTTONS_ID_VOLUME_UP,   0, 0, 0},
    {BUTTONS_TYPE_DIRECT, BUTTONS_ID_VOLUME_DOWN, 1, 0, 0},
    {BUTTONS_TYPE_DIRECT, BUTTONS_ID_FDR,         2, 0, 0},
    {BUTTONS_TYPE_DIRECT, BUTTONS_ID_MIC_MUTE,    3, 0, 0},
};
// No need for internal pull, external pull-ups used.
static const buttons_gpio_config_t gpios[] = {
    {BUTTONS_GPIO_TYPE_INTERRUPT, BUTTONS_GPIO_FLAG_INVERTED, {.interrupt = {GPIO_PULL_UP}}},
    {BUTTONS_GPIO_TYPE_INTERRUPT, BUTTONS_GPIO_FLAG_INVERTED, {.interrupt = {GPIO_PULL_UP}}},
    {BUTTONS_GPIO_TYPE_INTERRUPT, BUTTONS_GPIO_FLAG_INVERTED, {.interrupt = {GPIO_NO_PULL}}},
    {BUTTONS_GPIO_TYPE_INTERRUPT, 0                         , {.interrupt = {GPIO_NO_PULL}}},
};
// clang-format on

static const device_metadata_t available_buttons_metadata[] = {
    {
        .type = DEVICE_METADATA_BUTTONS_BUTTONS,
        .data = &buttons,
        .length = sizeof(buttons),
    },
    {
        .type = DEVICE_METADATA_BUTTONS_GPIOS,
        .data = &gpios,
        .length = sizeof(gpios),
    }};

zx_status_t Astro::ButtonsInit() {
  constexpr zx_device_prop_t props[] = {
      {BIND_PLATFORM_DEV_VID, 0, PDEV_VID_GENERIC},
      {BIND_PLATFORM_DEV_PID, 0, PDEV_PID_GENERIC},
      {BIND_PLATFORM_DEV_DID, 0, PDEV_DID_HID_BUTTONS},
  };

  const composite_device_desc_t comp_desc = {
      .props = props,
      .props_count = std::size(props),
      .fragments = astro_buttons_fragments,
      .fragments_count = std::size(astro_buttons_fragments),
      .primary_fragment = "volume-up",  // ???
      .spawn_colocated = false,
      .metadata_list = available_buttons_metadata,
      .metadata_count = std::size(available_buttons_metadata),
  };

  zx_status_t status = DdkAddComposite("astro-buttons", &comp_desc);
  if (status != ZX_OK) {
    zxlogf(ERROR, "%s: CompositeDeviceAdd failed: %d", __func__, status);
    return status;
  }

  return ZX_OK;
}

}  // namespace astro