src/connectivity/wlan/drivers/wlanphy/driver.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 "driver.h"

#include <lib/async-loop/cpp/loop.h>
#include <lib/async-loop/default.h>
#include <zircon/status.h>

#include <mutex>

#include <ddk/debug.h>
#include <ddk/driver.h>

#include "device.h"
#include "src/connectivity/wlan/drivers/wlanphy/wlanphy-bind.h"

// Not guarded by a mutex, because it will be valid between .init and .release and nothing else will
// exist outside those two calls.
static async::Loop* loop = nullptr;
static std::once_flag flag;

zx_status_t wlanphy_init(void** out_ctx) {
  static zx_status_t status = ZX_ERR_BAD_STATE;
  std::call_once(flag, []() {
    loop = new async::Loop(&kAsyncLoopConfigNoAttachToCurrentThread);
    status = loop->StartThread("wlanphy-loop");
    if (status != ZX_OK) {
      zxlogf(ERROR, "wlanphy: could not create event loop: %s", zx_status_get_string(status));
      delete loop;
      loop = nullptr;
    } else {
      zxlogf(INFO, "wlanphy: event loop started");
    }
  });
  return status;
}

zx_status_t wlanphy_bind(void* ctx, zx_device_t* device) {
  zxlogf(INFO, "%s", __func__);

  wlanphy_impl_protocol_t wlanphy_impl_proto;
  zx_status_t status;
  status = device_get_protocol(device, ZX_PROTOCOL_WLANPHY_IMPL,
                               static_cast<void*>(&wlanphy_impl_proto));
  if (status != ZX_OK) {
    zxlogf(ERROR, "wlanphy: bind: no wlanphy_impl protocol (%s)", zx_status_get_string(status));
    return ZX_ERR_INTERNAL;
  }

  auto wlanphy_dev = std::make_unique<wlanphy::Device>(device, wlanphy_impl_proto);
  status = wlanphy_dev->Bind();
  if (status != ZX_OK) {
    zxlogf(ERROR, "wlanphy: could not bind: %s", zx_status_get_string(status));
  } else {
    // devhost is now responsible for the memory used by wlandev. It will be
    // cleaned up in the Device::Release() method.
    wlanphy_dev.release();
  }
  return status;
}

async_dispatcher_t* wlanphy_async_t() { return loop->dispatcher(); }

static constexpr zx_driver_ops_t wlanphy_driver_ops = []() {
  zx_driver_ops_t ops = {};
  ops.version = DRIVER_OPS_VERSION;
  ops.init = wlanphy_init;
  ops.bind = wlanphy_bind;
  return ops;
}();

// clang-format: off
ZIRCON_DRIVER(wlan, wlanphy_driver_ops, "zircon", "0.1");