text: /************************************************************************************
   * configs/mikroe_stm32f4/src/up_usbdev.c
   * arch/arm/src/board/up_boot.c
   *
   *   Copyright (C) 2012-2013 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ************************************************************************************/
  
  /************************************************************************************
   * Included Files
   ************************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <sys/types.h>
  #include <stdint.h>
  #include <stdbool.h>
  #include <sched.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <nuttx/usb/usbdev.h>
  #include <nuttx/usb/usbhost.h>
  #include <nuttx/usb/usbdev_trace.h>
  
  #include "up_arch.h"
  #include "stm32.h"
  #include "mikroe-stm32f4-internal.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
  #  define CONFIG_USBHOST_STACKSIZE 1024
  #endif
  
  /************************************************************************************
   * Private Data
   ************************************************************************************/
  
  #ifdef CONFIG_USBHOST
  static struct usbhost_driver_s *g_drvr;
  #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[])
  {
    bool connected = false;
    int ret;
  
    uvdbg("Running\n");
    for (;;)
      {
        /* Wait for the device to change state */
  
        ret = DRVR_WAIT(g_drvr, connected);
        DEBUGASSERT(ret == OK);
  
        connected = !connected;
        uvdbg("%s\n", connected ? "connected" : "disconnected");
  
        /* Did we just become connected? */
  
        if (connected)
          {
            /* Yes.. enumerate the newly connected device */
  
            (void)DRVR_ENUMERATE(g_drvr);
          }
      }
  
    /* 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 pid;
    int ret;
  
    /* First, register all of the class drivers needed to support the drivers
     * that we care about:
     */
  
    uvdbg("Register class drivers\n");
    ret = usbhost_storageinit();
    if (ret != OK)
      {
        udbg("Failed to register the mass storage class\n");
      }
  
    /* Then get an instance of the USB host interface */
  
    uvdbg("Initialize USB host\n");
    g_drvr = usbhost_initialize(0);
    if (g_drvr)
      {
        /* Start a thread to handle device connection. */
  
        uvdbg("Start usbhost_waiter\n");
  
        pid = TASK_CREATE("usbhost", CONFIG_USBHOST_DEFPRIO,
                          CONFIG_USBHOST_STACKSIZE,
                          (main_t)usbhost_waiter, (FAR char * const *)NULL);
        return pid < 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 paramter:
   *   handler - New overcurrent interrupt handler
   *
   * Returned value:
   *   Old overcurrent interrupt handler
   *
   ************************************************************************************/
  
  #ifdef CONFIG_USBHOST
  xcpt_t stm32_setup_overcurrent(xcpt_t handler)
  {
    return stm32_gpiosetevent(GPIO_OTGFS_OVER, true, true, true, handler);
  }
  #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(FAR struct usbdev_s *dev, bool resume)
  {
    ulldbg("resume: %d\n", resume);
  }
  #endif
  
  #endif /* CONFIG_STM32_OTGFS */
  