text: /****************************************************************************
   * boards/arm/stm32/cloudctrl/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 "cloudctrl.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 STM3240G-EVAL 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 mass storage class */
  
    ret = usbhost_msc_initialize();
    if (ret != OK)
      {
        uerr("ERROR: Failed to register the mass storage class\n");
      }
  #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\n");
      }
  #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,
                             (main_t)usbhost_waiter, (char * const *)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 -ENOSYS;
  }
  #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 */
  