Missing calls to class SUSPEND/RESUME methods in all USB drivers

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5590 42af7a65-404d-4744-a932-0658087f49c3

10 files changed, 353 insertions, 24 deletions

diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_usbdev.c b/nuttx/arch/arm/src/lpc17xx/lpc17_usbdev.c
index b1ddb5928..753f82326 100644
--- a/nuttx/arch/arm/src/lpc17xx/lpc17_usbdev.c
+++ b/nuttx/arch/arm/src/lpc17xx/lpc17_usbdev.c
@@ -2175,6 +2175,22 @@ static int lpc17_usbinterrupt(int irq, FAR void *context)
             {
               usbtrace(TRACE_INTDECODE(LPC17_TRACEINTID_SUSPENDCHG),
                        (uint16_t)g_usbdev.devstatus);
+
+              /* Inform the Class driver of the change */
+
+              if (priv->driver)
+                {
+                  if (DEVSTATUS_SUSPEND(g_usbdev.devstatus))
+                    {
+                      CLASS_SUSPEND(priv->driver, &priv->usbdev);
+                    }
+                  else
+                    {
+                      CLASS_RESUME(priv->driver, &priv->usbdev);
+                    }
+                }
+
+              /* TODO: Perform power management operations here. */
             }
 
           /* Device reset */
diff --git a/nuttx/arch/arm/src/lpc214x/lpc214x_usbdev.c b/nuttx/arch/arm/src/lpc214x/lpc214x_usbdev.c
index 78a5fe1c3..78dc86992 100644
--- a/nuttx/arch/arm/src/lpc214x/lpc214x_usbdev.c
+++ b/nuttx/arch/arm/src/lpc214x/lpc214x_usbdev.c
@@ -1,7 +1,7 @@
 /*******************************************************************************
  * arch/arm/src/lpc214x/lpc214x_usbdev.c
  *
- *   Copyright (C) 2008-2010, 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2010, 2012-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -2139,6 +2139,22 @@ static int lpc214x_usbinterrupt(int irq, FAR void *context)
             {
               usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_SUSPENDCHG),
                        (uint16_t)g_usbdev.devstatus);
+
+              /* Inform the Class driver of the change */
+
+              if (priv->driver)
+                {
+                  if (DEVSTATUS_SUSPEND(g_usbdev.devstatus))
+                    {
+                      CLASS_SUSPEND(priv->driver, &priv->usbdev);
+                    }
+                  else
+                    {
+                      CLASS_RESUME(priv->driver, &priv->usbdev);
+                    }
+                }
+
+              /* TODO: Perform power management operations here. */
             }
 
           /* Device reset */
diff --git a/nuttx/arch/arm/src/lpc31xx/lpc31_usbdev.c b/nuttx/arch/arm/src/lpc31xx/lpc31_usbdev.c
index 386abb5b8..ddeb1bf6b 100644
--- a/nuttx/arch/arm/src/lpc31xx/lpc31_usbdev.c
+++ b/nuttx/arch/arm/src/lpc31xx/lpc31_usbdev.c
@@ -6,7 +6,7 @@
  *
  * Part of the NuttX OS and based, in part, on the LPC2148 USB driver:
  *
- *   Copyright (C) 2010-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2010-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -160,8 +160,9 @@
 #define LPC31_TRACEINTID_IFGETSTATUS        0x0015
 #define LPC31_TRACEINTID_SETCONFIG          0x0016
 #define LPC31_TRACEINTID_SETFEATURE         0x0017
-#define LPC31_TRACEINTID_SUSPENDCHG         0x0018
-#define LPC31_TRACEINTID_SYNCHFRAME         0x0019
+#define LPC31_TRACEINTID_SUSPENDED          0x0018
+#define LPC31_TRACEINTID_RESUMED            0x0019
+#define LPC31_TRACEINTID_SYNCHFRAME         0x001a
 
 /* Hardware interface **********************************************************/
 
@@ -309,6 +310,7 @@ struct lpc31_usbdev_s
   uint8_t                 selfpowered:1; /* 1: Device is self powered */
   uint8_t                 paddrset:1;    /* 1: Peripheral addr has been set */
   uint8_t                 attached:1;    /* 1: Host attached */
+  uint8_t                 suspended:1;   /* 1: Suspended */
   uint32_t                softprio;      /* Bitset of high priority interrupts */
   uint32_t                epavail;       /* Bitset of available endpoints */
 #ifdef CONFIG_LPC31_USBDEV_FRAME_INTERRUPT
@@ -1065,7 +1067,9 @@ static void lpc31_usbreset(struct lpc31_usbdev_s *priv)
    * driver should then accept any new configurations. */
 
   if (priv->driver)
+    {
       CLASS_DISCONNECT(priv->driver, &priv->usbdev);
+    }
 
   /* Set the interrupt Threshold control interval to 0 */
   lpc31_chgbits(USBDEV_USBCMD_ITC_MASK, USBDEV_USBCMD_ITCIMME, LPC31_USBDEV_USBCMD);
@@ -1649,6 +1653,7 @@ static int lpc31_usbinterrupt(int irq, FAR void *context)
   usbtrace(TRACE_INTENTRY(LPC31_TRACEINTID_USB), 0);
 
   /* Read the interrupts and then clear them */
+
   disr = lpc31_getreg(LPC31_USBDEV_USBSTS);
   lpc31_putreg(disr, LPC31_USBDEV_USBSTS);
 
@@ -1661,11 +1666,43 @@ static int lpc31_usbinterrupt(int irq, FAR void *context)
       usbtrace(TRACE_INTEXIT(LPC31_TRACEINTID_USB), 0);
       return OK;
     }
-  
-  if (disr & USBDEV_USBSTS_SLI)
+
+  /* When the device controller enters a suspend state from an active state,
+   * the SLI bit will be set to a one.
+   */
+ 
+  if (!priv->suspended && (disr & USBDEV_USBSTS_SLI) != 0)
     {
-      // FIXME: what do we need to do here...
-      usbtrace(TRACE_INTDECODE(LPC31_TRACEINTID_SUSPENDCHG),0);
+      usbtrace(TRACE_INTDECODE(LPC31_TRACEINTID_SUSPENDED),0);
+
+      /* Inform the Class driver of the suspend event */
+
+      priv->suspended = 1;
+      if (priv->driver)
+        {
+          CLASS_SUSPEND(priv->driver, &priv->usbdev);
+        }
+
+      /* TODO: Perform power management operations here. */
+    }
+
+  /* The device controller clears the SLI bit upon exiting from a suspend
+   * state. This bit can also be cleared by software writing a one to it.
+   */
+
+  else if (priv->suspended && (disr & USBDEV_USBSTS_SLI) == 0)
+    {
+      usbtrace(TRACE_INTDECODE(LPC31_TRACEINTID_RESUMED),0);
+
+      /* Inform the Class driver of the resume event */
+
+      priv->suspended = 0;
+      if (priv->driver)
+        {
+          CLASS_RESUME(priv->driver, &priv->usbdev);
+        }
+
+      /* TODO: Perform power management operations here. */
     }
 
   if (disr & USBDEV_USBSTS_PCI)
diff --git a/nuttx/arch/arm/src/lpc43xx/lpc43_usb0dev.c b/nuttx/arch/arm/src/lpc43xx/lpc43_usb0dev.c
index a40d6492d..d0af116d6 100644
--- a/nuttx/arch/arm/src/lpc43xx/lpc43_usb0dev.c
+++ b/nuttx/arch/arm/src/lpc43xx/lpc43_usb0dev.c
@@ -1,7 +1,7 @@
 /*******************************************************************************
  * arch/arm/src/lpc43xx/lpc43_usbdev.c
  *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2012-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Part of the NuttX OS and based, in part, on the LPC31xx USB driver:
@@ -163,8 +163,9 @@
 #define LPC43_TRACEINTID_IFGETSTATUS        0x0015
 #define LPC43_TRACEINTID_SETCONFIG          0x0016
 #define LPC43_TRACEINTID_SETFEATURE         0x0017
-#define LPC43_TRACEINTID_SUSPENDCHG         0x0018
-#define LPC43_TRACEINTID_SYNCHFRAME         0x0019
+#define LPC43_TRACEINTID_SUSPENDED          0x0018
+#define LPC43_TRACEINTID_RESUMED            0x0019
+#define LPC43_TRACEINTID_SYNCHFRAME         0x001a
 
 /* Hardware interface **********************************************************/
 
@@ -312,6 +313,7 @@ struct lpc43_usbdev_s
   uint8_t                 selfpowered:1; /* 1: Device is self powered */
   uint8_t                 paddrset:1;    /* 1: Peripheral addr has been set */
   uint8_t                 attached:1;    /* 1: Host attached */
+  uint8_t                 suspended:1;   /* 1: Suspended */
   uint32_t                softprio;      /* Bitset of high priority interrupts */
   uint32_t                epavail;       /* Bitset of available endpoints */
 #ifdef CONFIG_LPC43_USBDEV_FRAME_INTERRUPT
@@ -1665,10 +1667,42 @@ static int lpc43_usbinterrupt(int irq, FAR void *context)
       return OK;
     }
   
-  if (disr & USBDEV_USBSTS_SLI)
+  /* When the device controller enters a suspend state from an active state,
+   * the SLI bit will be set to a one.
+   */
+ 
+  if (!priv->suspended && (disr & USBDEV_USBSTS_SLI) != 0)
+    {
+      usbtrace(TRACE_INTDECODE(LPC43_TRACEINTID_SUSPENDED),0);
+
+      /* Inform the Class driver of the suspend event */
+
+      priv->suspended = 1;
+      if (priv->driver)
+        {
+          CLASS_SUSPEND(priv->driver, &priv->usbdev);
+        }
+
+      /* TODO: Perform power management operations here. */
+    }
+
+  /* The device controller clears the SLI bit upon exiting from a suspend
+   * state. This bit can also be cleared by software writing a one to it.
+   */
+
+  else if (priv->suspended && (disr & USBDEV_USBSTS_SLI) == 0)
     {
-      // FIXME: what do we need to do here...
-      usbtrace(TRACE_INTDECODE(LPC43_TRACEINTID_SUSPENDCHG),0);
+      usbtrace(TRACE_INTDECODE(LPC43_TRACEINTID_RESUMED),0);
+
+      /* Inform the Class driver of the resume event */
+
+      priv->suspended = 0;
+      if (priv->driver)
+        {
+          CLASS_RESUME(priv->driver, &priv->usbdev);
+        }
+
+      /* TODO: Perform power management operations here. */
     }
 
   if (disr & USBDEV_USBSTS_PCI)
diff --git a/nuttx/arch/arm/src/stm32/stm32_otgfsdev.c b/nuttx/arch/arm/src/stm32/stm32_otgfsdev.c
index a2de6d138..bcce3ce60 100644
--- a/nuttx/arch/arm/src/stm32/stm32_otgfsdev.c
+++ b/nuttx/arch/arm/src/stm32/stm32_otgfsdev.c
@@ -424,7 +424,6 @@ struct stm32_usbdev_s
 
   uint8_t                 stalled:1;     /* 1: Protocol stalled */
   uint8_t                 selfpowered:1; /* 1: Device is self powered */
-  uint8_t                 connected:1;   /* 1: Host connected */
   uint8_t                 addressed:1;   /* 1: Peripheral address has been set */
   uint8_t                 configured:1;  /* 1: Class driver has been configured */
   uint8_t                 wakeup:1;      /* 1: Device remote wake-up */
@@ -1074,8 +1073,6 @@ static void stm32_epin_request(FAR struct stm32_usbdev_s *priv,
   struct stm32_req_s *privreq;
   uint32_t regaddr;
   uint32_t regval;
-  int32_t timeout;
-  int avail;
   uint8_t *buf;
   int nbytes;
   int nwords;
@@ -2874,6 +2871,13 @@ static inline void stm32_resumeinterrupt(FAR struct stm32_usbdev_s *priv)
   /* Restore full power -- whatever that means for this particular board */
 
   stm32_usbsuspend((struct usbdev_s *)priv, true);
+
+  /* Notify the class driver of the resume event */
+
+  if (priv->driver)
+    {
+      CLASS_RESUME(priv->driver, &priv->usbdev);
+    }
 }
 
 /*******************************************************************************
@@ -2888,7 +2892,16 @@ static inline void stm32_suspendinterrupt(FAR struct stm32_usbdev_s *priv)
 {
 #ifdef CONFIG_USBDEV_LOWPOWER
   uint32_t regval;
+#endif
 
+  /* Notify the class driver of the suspend event */
+
+  if (priv->driver)
+    {
+      CLASS_SUSPEND(priv->driver, &priv->usbdev);
+    }
+
+#ifdef CONFIG_USBDEV_LOWPOWER
   /* OTGFS_DSTS_SUSPSTS is set as long as the suspend condition is detected
    * on USB.  Check if we are still have the suspend condition, that we are
    * connected to the host, and that we have been configured.
@@ -2896,9 +2909,7 @@ static inline void stm32_suspendinterrupt(FAR struct stm32_usbdev_s *priv)
 
   regval = stm32_getreg(STM32_OTGFS_DSTS);
 
-  if ((regval & OTGFS_DSTS_SUSPSTS) != 0 &&
-      priv->connected &&
-      devstate == DEVSTATE_CONFIGURED)
+  if ((regval & OTGFS_DSTS_SUSPSTS) != 0 && devstate == DEVSTATE_CONFIGURED)
     {
       /* Switch off OTG FS clocking.  Setting OTGFS_PCGCCTL_STPPCLK stops the
        * PHY clock.
diff --git a/nuttx/arch/arm/src/stm32/stm32_usbdev.c b/nuttx/arch/arm/src/stm32/stm32_usbdev.c
index 602de3824..d13ac8f96 100644
--- a/nuttx/arch/arm/src/stm32/stm32_usbdev.c
+++ b/nuttx/arch/arm/src/stm32/stm32_usbdev.c
@@ -2346,6 +2346,13 @@ static void stm32_suspend(struct stm32_usbdev_s *priv)
 {
   uint16_t regval;
   
+  /* Notify the class driver of the suspend event */
+
+  if (priv->driver)
+    {
+      CLASS_SUSPEND(priv->driver, &priv->usbdev);
+    }
+
   /* Disable ESOF polling, disable the SUSP interrupt, and enable the WKUP
    * interrupt.  Clear any pending WKUP interrupt.
    */
@@ -2411,6 +2418,13 @@ static void stm32_initresume(struct stm32_usbdev_s *priv)
   /* Reset FSUSP bit and enable normal interrupt handling */
 
   stm32_putreg(STM32_CNTR_SETUP, STM32_USB_CNTR);
+
+  /* Notify the class driver of the resume event */
+
+  if (priv->driver)
+    {
+      CLASS_RESUME(priv->driver, &priv->usbdev);
+    }
 } 
 
 /****************************************************************************
diff --git a/nuttx/arch/avr/src/at90usb/at90usb_usbdev.c b/nuttx/arch/avr/src/at90usb/at90usb_usbdev.c
index 89949e662..0e3ac6487 100644
--- a/nuttx/arch/avr/src/at90usb/at90usb_usbdev.c
+++ b/nuttx/arch/avr/src/at90usb/at90usb_usbdev.c
@@ -1955,6 +1955,15 @@ static inline void avr_gensuspend(void)
 {
   usbtrace(TRACE_INTENTRY(AVR_TRACEINTID_SUSPEND), UDIEN);
 
+  /* Notify the class driver of the suspend event */
+
+  if (g_usbdev.driver)
+    {
+      CLASS_SUSPEND(g_usbdev.driver, &g_usbdev.usbdev);
+    }
+
+  /* Disable suspend event interrupts; enable wakeup event interrupt */
+
   UDIEN &= ~(1 << SUSPE);
   UDIEN |= (1 << WAKEUPE);
 
@@ -1992,6 +2001,13 @@ static void avr_genwakeup(void)
   USBCON &= ~(1 << FRZCLK);
   UDIEN  &= ~(1 << WAKEUPE);
   UDIEN  |=  (1 << SUSPE);
+
+  /* Notify the class driver of the resume event */
+
+  if (g_usbdev.driver)
+    {
+      CLASS_RESUME(g_usbdev.driver, &g_usbdev.usbdev);
+    }
 }
 
 /*******************************************************************************
diff --git a/nuttx/arch/mips/src/pic32mx/pic32mx-usbdev.c b/nuttx/arch/mips/src/pic32mx/pic32mx-usbdev.c
index dafd35aa0..8d9f7c058 100644
--- a/nuttx/arch/mips/src/pic32mx/pic32mx-usbdev.c
+++ b/nuttx/arch/mips/src/pic32mx/pic32mx-usbdev.c
@@ -2901,6 +2901,13 @@ static void pic32mx_suspend(struct pic32mx_usbdev_s *priv)
 {
   uint16_t regval;
 
+  /* Notify the class driver of the suspend event */
+
+  if (priv->driver)
+    {
+      CLASS_SUSPEND(priv->driver, &priv->usbdev);
+    }
+
   /* Enable the ACTV interrupt.
    *
    * NOTE: Do not clear UIRbits.ACTVIF here! Reason: ACTVIF is only
@@ -2977,8 +2984,16 @@ static void pic32mx_resume(struct pic32mx_usbdev_s *priv)
    * PLL to lock.
    */
 
-   pic32mx_putreg(USB_INT_IDLE, PIC32MX_USBOTG_IR);
-   irqrestore(flags);
+  pic32mx_putreg(USB_INT_IDLE, PIC32MX_USBOTG_IR);
+ 
+  /* Notify the class driver of the resume event */
+
+  if (priv->driver)
+    {
+      CLASS_RESUME(priv->driver, &priv->usbdev);
+    }
+
+  irqrestore(flags);
 }
 
 /****************************************************************************
diff --git a/nuttx/drivers/usbdev/cdcacm.c b/nuttx/drivers/usbdev/cdcacm.c
index 9b6fae1d6..cb8679976 100644
--- a/nuttx/drivers/usbdev/cdcacm.c
+++ b/nuttx/drivers/usbdev/cdcacm.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * drivers/usbdev/cdcacm.c
  *
- *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -188,6 +188,12 @@ static int     cdcacm_setup(FAR struct usbdevclass_driver_s *driver,
                  size_t outlen);
 static void    cdcacm_disconnect(FAR struct usbdevclass_driver_s *driver,
                  FAR struct usbdev_s *dev);
+#ifdef CONFIG_SERIAL_REMOVABLE
+static void    cdcacm_suspend(FAR struct usbdevclass_driver_s *driver,
+                 FAR struct usbdev_s *dev);
+static void    cdcacm_resume(FAR struct usbdevclass_driver_s *driver,
+                 FAR struct usbdev_s *dev);
+#endif
 
 /* UART Operations **********************************************************/
 
@@ -211,8 +217,13 @@ static const struct usbdevclass_driverops_s g_driverops =
   cdcacm_unbind,        /* unbind */
   cdcacm_setup,         /* setup */
   cdcacm_disconnect,    /* disconnect */
+#ifdef CONFIG_SERIAL_REMOVABLE
+  cdcacm_suspend,       /* suspend */
+  cdcacm_resume,        /* resume */
+#else
   NULL,                 /* suspend */
   NULL,                 /* resume */
+#endif
 };
 
 /* Serial port **************************************************************/
@@ -841,6 +852,7 @@ static void cdcacm_rdcomplete(FAR struct usbdev_ep_s *ep,
     {
       usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_RDSUBMIT), (uint16_t)-req->result);
     }
+
   irqrestore(flags);
 }
 
@@ -950,6 +962,7 @@ static int cdcacm_bind(FAR struct usbdevclass_driver_s *driver,
       ret = -ENOMEM;
       goto errout;
     }
+
   priv->ctrlreq->callback = cdcacm_ep0incomplete;
 
   /* Pre-allocate all endpoints... the endpoints will not be functional
@@ -1622,6 +1635,79 @@ static void cdcacm_disconnect(FAR struct usbdevclass_driver_s *driver,
 }
 
 /****************************************************************************
+ * Name: cdcacm_suspend
+ *
+ * Description:
+ *   Handle the USB suspend event.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SERIAL_REMOVABLE
+static void cdcacm_suspend(FAR struct usbdevclass_driver_s *driver,
+                           FAR struct usbdev_s *dev)
+{
+  FAR struct cdcacm_dev_s *priv;
+
+  usbtrace(TRACE_CLASSSUSPEND, 0);
+
+#ifdef CONFIG_DEBUG
+  if (!driver || !dev)
+    {
+      usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0);
+      return;
+     }
+#endif
+
+  /* Extract reference to private data */
+
+  priv = ((FAR struct cdcacm_driver_s*)driver)->dev;
+
+  /* And let the "upper half" driver now that we are suspended */
+
+  uart_connected(&priv->serdev, false);
+}
+#endif
+
+/****************************************************************************
+ * Name: cdcacm_resume
+ *
+ * Description:
+ *   Handle the USB resume event.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SERIAL_REMOVABLE
+static void cdcacm_resume(FAR struct usbdevclass_driver_s *driver,
+                          FAR struct usbdev_s *dev)
+{
+  FAR struct cdcacm_dev_s *priv;
+
+  usbtrace(TRACE_CLASSRESUME, 0);
+
+#ifdef CONFIG_DEBUG
+  if (!driver || !dev)
+    {
+      usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0);
+      return;
+     }
+#endif
+
+  /* Extract reference to private data */
+
+  priv = ((FAR struct cdcacm_driver_s*)driver)->dev;
+
+  /* Are we still configured? */
+
+  if (priv->config != CDCACM_CONFIGIDNONE)
+    {
+      /* Yes.. let the "upper half" know that have resumed */
+
+      uart_connected(&priv->serdev, true);
+    }
+}
+#endif
+
+/****************************************************************************
  * Serial Device Methods
  ****************************************************************************/
 
@@ -2179,7 +2265,7 @@ int cdcacm_initialize(int minor, FAR void **handle)
  *
  * Description:
  *   Un-initialize the USB storage class driver.  This function is used
- *   internally by the USB composite driver to unitialized the CDC/ACM
+ *   internally by the USB composite driver to unitialize the CDC/ACM
  *   driver.  This same interface is available (with an untyped input
  *   parameter) when the CDC/ACM driver is used standalone.
  *
diff --git a/nuttx/drivers/usbdev/pl2303.c b/nuttx/drivers/usbdev/pl2303.c
index 98163f133..7b07a9cba 100644
--- a/nuttx/drivers/usbdev/pl2303.c
+++ b/nuttx/drivers/usbdev/pl2303.c
@@ -343,6 +343,12 @@ static int     usbclass_setup(FAR struct usbdevclass_driver_s *driver,
                  size_t outlen);
 static void    usbclass_disconnect(FAR struct usbdevclass_driver_s *driver,
                  FAR struct usbdev_s *dev);
+#ifdef CONFIG_SERIAL_REMOVABLE
+static void    usbclass_suspend(FAR struct usbdevclass_driver_s *driver,
+                 FAR struct usbdev_s *dev);
+static void    usbclass_resume(FAR struct usbdevclass_driver_s *driver,
+                 FAR struct usbdev_s *dev);
+#endif
 
 /* Serial port *************************************************************/
 
@@ -366,8 +372,13 @@ static const struct usbdevclass_driverops_s g_driverops =
   usbclass_unbind,      /* unbind */
   usbclass_setup,       /* setup */
   usbclass_disconnect,  /* disconnect */
+#ifdef CONFIG_SERIAL_REMOVABLE
+  usbclass_suspend,     /* suspend */
+  usbclass_resume,      /* resume */
+#else
   NULL,                 /* suspend */
   NULL,                 /* resume */
+#endif
 };
 
 /* Serial port *************************************************************/
@@ -1889,6 +1900,79 @@ static void usbclass_disconnect(FAR struct usbdevclass_driver_s *driver,
 }
 
 /****************************************************************************
+ * Name: usbclass_suspend
+ *
+ * Description:
+ *   Handle the USB suspend event.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SERIAL_REMOVABLE
+static void usbclass_suspend(FAR struct usbdevclass_driver_s *driver,
+                 FAR struct usbdev_s *dev)
+{
+  FAR struct cdcacm_dev_s *priv;
+
+  usbtrace(TRACE_CLASSSUSPEND, 0);
+
+#ifdef CONFIG_DEBUG
+  if (!driver || !dev)
+    {
+      usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0);
+      return;
+     }
+#endif
+
+  /* Extract reference to private data */
+
+  priv = ((FAR struct cdcacm_driver_s*)driver)->dev;
+
+  /* And let the "upper half" driver now that we are suspended */
+
+  uart_connected(&priv->serdev, false);
+}
+#endif
+
+/****************************************************************************
+ * Name: usbclass_resume
+ *
+ * Description:
+ *   Handle the USB resume event.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SERIAL_REMOVABLE
+static void usbclass_resume(FAR struct usbdevclass_driver_s *driver,
+                       FAR struct usbdev_s *dev)
+{
+  FAR struct cdcacm_dev_s *priv;
+
+  usbtrace(TRACE_CLASSRESUME, 0);
+
+#ifdef CONFIG_DEBUG
+  if (!driver || !dev)
+    {
+      usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0);
+      return;
+     }
+#endif
+
+  /* Extract reference to private data */
+
+  priv = ((FAR struct cdcacm_driver_s*)driver)->dev;
+
+  /* Are we still configured? */
+
+  if (priv->config != PL2303_CONFIGIDNONE)
+    {
+      /* Yes.. let the "upper half" know that have resumed */
+
+      uart_connected(&priv->serdev, true);
+    }
+}
+#endif
+
+/****************************************************************************
  * Serial Device Methods
  ****************************************************************************/