/****************************************************************************
 * boards/arm/stm32/mikroe-stm32f4/src/stm32_usb.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <sched.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>

#include <nuttx/kthread.h>
#include <nuttx/usb/usbdev.h>
#include <nuttx/usb/usbhost.h>
#include <nuttx/usb/usbdev_trace.h>

#include "arm_internal.h"
#include "stm32.h"
#include "stm32_otgfs.h"
#include "mikroe-stm32f4.h"

#ifdef CONFIG_STM32_OTGFS

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#if defined(CONFIG_USBDEV) || defined(CONFIG_USBHOST)
#  define HAVE_USB 1
#else
#  warning "CONFIG_STM32_OTGFS is enabled but neither CONFIG_USBDEV nor CONFIG_USBHOST"
#  undef HAVE_USB
#endif

#ifndef CONFIG_USBHOST_DEFPRIO
#  define CONFIG_USBHOST_DEFPRIO 50
#endif

#ifndef CONFIG_USBHOST_STACKSIZE
#  ifdef CONFIG_USBHOST_HUB
#    define CONFIG_USBHOST_STACKSIZE 1536
#  else
#    define CONFIG_USBHOST_STACKSIZE 1024
#  endif
#endif

/****************************************************************************
 * Private Data
 ****************************************************************************/

#ifdef CONFIG_USBHOST
static struct usbhost_connection_s *g_usbconn;
#endif

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: usbhost_waiter
 *
 * Description:
 *   Wait for USB devices to be connected.
 *
 ****************************************************************************/

#ifdef CONFIG_USBHOST
static int usbhost_waiter(int argc, char *argv[])
{
  struct usbhost_hubport_s *hport;

  uinfo("Running\n");
  for (; ; )
    {
      /* Wait for the device to change state */

      DEBUGVERIFY(CONN_WAIT(g_usbconn, &hport));
      uinfo("%s\n", hport->connected ? "connected" : "disconnected");

      /* Did we just become connected? */

      if (hport->connected)
        {
          /* Yes.. enumerate the newly connected device */

          CONN_ENUMERATE(g_usbconn, hport);
        }
    }

  /* Keep the compiler from complaining */

  return 0;
}
#endif

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: stm32_usbinitialize
 *
 * Description:
 *   Called from stm32_usbinitialize very early in inialization to setup
 *   USB-related GPIO pins for the STM32F4Discovery board.
 *
 ****************************************************************************/

void stm32_usbinitialize(void)
{
  /* The OTG FS has an internal soft pull-up.
   * No GPIO configuration is required
   */

  /* Configure the OTG FS VBUS sensing GPIO,
   * Power On, and Overcurrent GPIOs
   */

#ifdef CONFIG_STM32_OTGFS
  stm32_configgpio(GPIO_OTGFS_VBUS);
  stm32_configgpio(GPIO_OTGFS_PWRON);
  stm32_configgpio(GPIO_OTGFS_OVER);
#endif
}

/****************************************************************************
 * Name: stm32_usbhost_initialize
 *
 * Description:
 *   Called at application startup time to initialize the USB host
 *   functionality.
 *   This function will start a thread that will monitor for device
 *   connection/disconnection events.
 *
 ****************************************************************************/

#ifdef CONFIG_USBHOST
int stm32_usbhost_initialize(void)
{
  int ret;

  /* First, register all of the class drivers needed to support the drivers
   * that we care about:
   */

  uinfo("Register class drivers\n");

#ifdef CONFIG_USBHOST_MSC
  /* Register the USB host Mass Storage Class */

  ret = usbhost_msc_initialize();
  if (ret != OK)
    {
      uerr("ERROR: Failed to register the mass storage class: %d\n", ret);
    }
#endif

#ifdef CONFIG_USBHOST_CDCACM
  /* Register the CDC/ACM serial class */

  ret = usbhost_cdcacm_initialize();
  if (ret != OK)
    {
      uerr("ERROR: Failed to register the CDC/ACM serial class: %d\n", ret);
    }
#endif

  /* Then get an instance of the USB host interface */

  uinfo("Initialize USB host\n");
  g_usbconn = stm32_otgfshost_initialize(0);
  if (g_usbconn)
    {
      /* Start a thread to handle device connection. */

      uinfo("Start usbhost_waiter\n");

      ret = kthread_create("usbhost", CONFIG_USBHOST_DEFPRIO,
                           CONFIG_USBHOST_STACKSIZE,
                           usbhost_waiter, NULL);
      return ret < 0 ? -ENOEXEC : OK;
    }

  return -ENODEV;
}
#endif

/****************************************************************************
 * Name: stm32_usbhost_vbusdrive
 *
 * Description:
 *   Enable/disable driving of VBUS 5V output.  This function must be
 *   provided be each platform that implements the STM32 OTG FS host
 *   interface
 *
 *   "On-chip 5 V VBUS generation is not supported. For this reason, a
 *    charge pump or, if 5 V are available on the application board, a
 *    basic power switch, must be added externally to drive the 5 V VBUS
 *    line. The external charge pump can be driven by any GPIO output.
 *    When the application decides to power on VBUS using the chosen GPIO,
 *    it must also set the port power bit in the host port control and
 *    status register (PPWR bit in OTG_FS_HPRT).
 *
 *   "The application uses this field to control power to this port,
 *    and the core clears this bit on an overcurrent condition."
 *
 * Input Parameters:
 *   iface - For future growth to handle multiple USB host interface.
 *           Should be zero.
 *   enable - true: enable VBUS power; false: disable VBUS power
 *
 * Returned Value:
 *   None
 *
 ****************************************************************************/

#ifdef CONFIG_USBHOST
void stm32_usbhost_vbusdrive(int iface, bool enable)
{
  DEBUGASSERT(iface == 0);

  if (enable)
    {
      /* Enable the Power Switch by driving the enable pin low */

      stm32_gpiowrite(GPIO_OTGFS_PWRON, false);
    }
  else
    {
      /* Disable the Power Switch by driving the enable pin high */

      stm32_gpiowrite(GPIO_OTGFS_PWRON, true);
    }
}
#endif

/****************************************************************************
 * Name: stm32_setup_overcurrent
 *
 * Description:
 *   Setup to receive an interrupt-level callback if an overcurrent
 *   condition is detected.
 *
 * Input Parameters:
 *   handler - New overcurrent interrupt handler
 *   arg     - The argument provided for the interrupt handler
 *
 * Returned Value:
 *   Zero (OK) is returned on success.  Otherwise, a negated errno value
 *   is returned to indicate the nature of the failure.
 *
 ****************************************************************************/

#ifdef CONFIG_USBHOST
int stm32_setup_overcurrent(xcpt_t handler, void *arg)
{
  return stm32_gpiosetevent(GPIO_OTGFS_OVER, true, true, true, handler, arg);
}
#endif

/****************************************************************************
 * Name: stm32_usbsuspend
 *
 * Description:
 *   Board logic must provide the stm32_usbsuspend logic if the USBDEV
 *   driver is used.  This function is called whenever the USB enters or
 *   leaves suspend mode. This is an opportunity for the board logic to
 *   shutdown clocks, power, etc. while the USB is suspended.
 *
 ****************************************************************************/

#ifdef CONFIG_USBDEV
void stm32_usbsuspend(struct usbdev_s *dev, bool resume)
{
  uinfo("resume: %d\n", resume);
}
#endif

#endif /* CONFIG_STM32_OTGFS */
