diff options
Diffstat (limited to 'nuttx/drivers/usbdev/cdcacm.c')
| -rw-r--r-- | nuttx/drivers/usbdev/cdcacm.c | 2212 |
1 files changed, 2212 insertions, 0 deletions
diff --git a/nuttx/drivers/usbdev/cdcacm.c b/nuttx/drivers/usbdev/cdcacm.c new file mode 100644 index 000000000..97c9d7c77 --- /dev/null +++ b/nuttx/drivers/usbdev/cdcacm.c @@ -0,0 +1,2212 @@ +/**************************************************************************** + * drivers/usbdev/cdcacm.c + * + * Copyright (C) 2011-2012 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 <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <semaphore.h> +#include <string.h> +#include <errno.h> +#include <queue.h> +#include <debug.h> + +#include <nuttx/kmalloc.h> +#include <nuttx/arch.h> +#include <nuttx/serial/serial.h> + +#include <nuttx/usb/usb.h> +#include <nuttx/usb/cdc.h> +#include <nuttx/usb/usbdev.h> +#include <nuttx/usb/cdcacm.h> +#include <nuttx/usb/usbdev_trace.h> + +#include "cdcacm.h" + +#ifdef CONFIG_USBMSC_COMPOSITE +# include <nuttx/usb/composite.h> +# include "composite.h" +#endif + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/* Container to support a list of requests */ + +struct cdcacm_req_s +{ + FAR struct cdcacm_req_s *flink; /* Implements a singly linked list */ + FAR struct usbdev_req_s *req; /* The contained request */ +}; + +/* This structure describes the internal state of the driver */ + +struct cdcacm_dev_s +{ + FAR struct uart_dev_s serdev; /* Serial device structure */ + FAR struct usbdev_s *usbdev; /* usbdev driver pointer */ + + uint8_t config; /* Configuration number */ + uint8_t nwrq; /* Number of queue write requests (in reqlist)*/ + uint8_t nrdq; /* Number of queue read requests (in epbulkout) */ + uint8_t minor; /* The device minor number */ + bool rxenabled; /* true: UART RX "interrupts" enabled */ + int16_t rxhead; /* Working head; used when rx int disabled */ + + uint8_t ctrlline; /* Buffered control line state */ + struct cdc_linecoding_s linecoding; /* Buffered line status */ + cdcacm_callback_t callback; /* Serial event callback function */ + + FAR struct usbdev_ep_s *epintin; /* Interrupt IN endpoint structure */ + FAR struct usbdev_ep_s *epbulkin; /* Bulk IN endpoint structure */ + FAR struct usbdev_ep_s *epbulkout; /* Bulk OUT endpoint structure */ + FAR struct usbdev_req_s *ctrlreq; /* Allocoated control request */ + struct sq_queue_s reqlist; /* List of write request containers */ + + /* Pre-allocated write request containers. The write requests will + * be linked in a free list (reqlist), and used to send requests to + * EPBULKIN; Read requests will be queued in the EBULKOUT. + */ + + struct cdcacm_req_s wrreqs[CONFIG_CDCACM_NWRREQS]; + struct cdcacm_req_s rdreqs[CONFIG_CDCACM_NWRREQS]; + + /* Serial I/O buffers */ + + char rxbuffer[CONFIG_CDCACM_RXBUFSIZE]; + char txbuffer[CONFIG_CDCACM_TXBUFSIZE]; +}; + +/* The internal version of the class driver */ + +struct cdcacm_driver_s +{ + struct usbdevclass_driver_s drvr; + FAR struct cdcacm_dev_s *dev; +}; + +/* This is what is allocated */ + +struct cdcacm_alloc_s +{ + struct cdcacm_dev_s dev; + struct cdcacm_driver_s drvr; +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/* Transfer helpers *********************************************************/ + +static uint16_t cdcacm_fillrequest(FAR struct cdcacm_dev_s *priv, + uint8_t *reqbuf, uint16_t reqlen); +static int cdcacm_sndpacket(FAR struct cdcacm_dev_s *priv); +static inline int cdcacm_recvpacket(FAR struct cdcacm_dev_s *priv, + uint8_t *reqbuf, uint16_t reqlen); + +/* Request helpers *********************************************************/ + +static struct usbdev_req_s *cdcacm_allocreq(FAR struct usbdev_ep_s *ep, + uint16_t len); +static void cdcacm_freereq(FAR struct usbdev_ep_s *ep, + FAR struct usbdev_req_s *req); + +/* Configuration ***********************************************************/ + +static void cdcacm_resetconfig(FAR struct cdcacm_dev_s *priv); +#ifdef CONFIG_USBDEV_DUALSPEED +static int cdcacm_epconfigure(FAR struct usbdev_ep_s *ep, + enum cdcacm_epdesc_e epid, uint16_t mxpacket, bool last); +#endif +static int cdcacm_setconfig(FAR struct cdcacm_dev_s *priv, + uint8_t config); + +/* Completion event handlers ***********************************************/ + +static void cdcacm_ep0incomplete(FAR struct usbdev_ep_s *ep, + FAR struct usbdev_req_s *req); +static void cdcacm_rdcomplete(FAR struct usbdev_ep_s *ep, + FAR struct usbdev_req_s *req); +static void cdcacm_wrcomplete(FAR struct usbdev_ep_s *ep, + FAR struct usbdev_req_s *req); + +/* USB class device ********************************************************/ + +static int cdcacm_bind(FAR struct usbdevclass_driver_s *driver, + FAR struct usbdev_s *dev); +static void cdcacm_unbind(FAR struct usbdevclass_driver_s *driver, + FAR struct usbdev_s *dev); +static int cdcacm_setup(FAR struct usbdevclass_driver_s *driver, + FAR struct usbdev_s *dev, + FAR const struct usb_ctrlreq_s *ctrl, FAR uint8_t *dataout, + size_t outlen); +static void cdcacm_disconnect(FAR struct usbdevclass_driver_s *driver, + FAR struct usbdev_s *dev); + +/* UART Operations **********************************************************/ + +static int cdcuart_setup(FAR struct uart_dev_s *dev); +static void cdcuart_shutdown(FAR struct uart_dev_s *dev); +static int cdcuart_attach(FAR struct uart_dev_s *dev); +static void cdcuart_detach(FAR struct uart_dev_s *dev); +static int cdcuart_ioctl(FAR struct file *filep,int cmd,unsigned long arg); +static void cdcuart_rxint(FAR struct uart_dev_s *dev, bool enable); +static void cdcuart_txint(FAR struct uart_dev_s *dev, bool enable); +static bool cdcuart_txempty(FAR struct uart_dev_s *dev); + +/**************************************************************************** + * Private Variables + ****************************************************************************/ +/* USB class device *********************************************************/ + +static const struct usbdevclass_driverops_s g_driverops = +{ + cdcacm_bind, /* bind */ + cdcacm_unbind, /* unbind */ + cdcacm_setup, /* setup */ + cdcacm_disconnect, /* disconnect */ + NULL, /* suspend */ + NULL, /* resume */ +}; + +/* Serial port **************************************************************/ + +static const struct uart_ops_s g_uartops = +{ + cdcuart_setup, /* setup */ + cdcuart_shutdown, /* shutdown */ + cdcuart_attach, /* attach */ + cdcuart_detach, /* detach */ + cdcuart_ioctl, /* ioctl */ + NULL, /* receive */ + cdcuart_rxint, /* rxinit */ + NULL, /* rxavailable */ + NULL, /* send */ + cdcuart_txint, /* txinit */ + NULL, /* txready */ + cdcuart_txempty /* txempty */ +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: cdcacm_fillrequest + * + * Description: + * If there is data to send it is copied to the given buffer. Called + * either to initiate the first write operation, or from the completion + * interrupt handler service consecutive write operations. + * + * NOTE: The USB serial driver does not use the serial drivers + * uart_xmitchars() API. That logic is essentially duplicated here because + * unlike UART hardware, we need to be able to handle writes not byte-by-byte, + * but packet-by-packet. Unfortunately, that decision also exposes some + * internals of the serial driver in the following. + * + ****************************************************************************/ + +static uint16_t cdcacm_fillrequest(FAR struct cdcacm_dev_s *priv, uint8_t *reqbuf, + uint16_t reqlen) +{ + FAR uart_dev_t *serdev = &priv->serdev; + FAR struct uart_buffer_s *xmit = &serdev->xmit; + irqstate_t flags; + uint16_t nbytes = 0; + + /* Disable interrupts */ + + flags = irqsave(); + + /* Transfer bytes while we have bytes available and there is room in the request */ + + while (xmit->head != xmit->tail && nbytes < reqlen) + { + *reqbuf++ = xmit->buffer[xmit->tail]; + nbytes++; + + /* Increment the tail pointer */ + + if (++(xmit->tail) >= xmit->size) + { + xmit->tail = 0; + } + } + + /* When all of the characters have been sent from the buffer + * disable the "TX interrupt". + */ + + if (xmit->head == xmit->tail) + { + uart_disabletxint(serdev); + } + + /* If any bytes were removed from the buffer, inform any waiters + * there there is space available. + */ + + if (nbytes) + { + uart_datasent(serdev); + } + + irqrestore(flags); + return nbytes; +} + +/**************************************************************************** + * Name: cdcacm_sndpacket + * + * Description: + * This function obtains write requests, transfers the TX data into the + * request, and submits the requests to the USB controller. This continues + * untils either (1) there are no further packets available, or (2) thre is + * no further data to send. + * + ****************************************************************************/ + +static int cdcacm_sndpacket(FAR struct cdcacm_dev_s *priv) +{ + FAR struct usbdev_ep_s *ep; + FAR struct usbdev_req_s *req; + FAR struct cdcacm_req_s *reqcontainer; + uint16_t reqlen; + irqstate_t flags; + int len; + int ret = OK; + +#ifdef CONFIG_DEBUG + if (priv == NULL) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return -ENODEV; + } +#endif + + flags = irqsave(); + + /* Use our IN endpoint for the transfer */ + + ep = priv->epbulkin; + + /* Loop until either (1) we run out or write requests, or (2) cdcacm_fillrequest() + * is unable to fill the request with data (i.e., until there is no more data + * to be sent). + */ + + uvdbg("head=%d tail=%d nwrq=%d empty=%d\n", + priv->serdev.xmit.head, priv->serdev.xmit.tail, + priv->nwrq, sq_empty(&priv->reqlist)); + + /* Get the maximum number of bytes that will fit into one bulk IN request */ + +#ifdef CONFIG_CDCACM_BULKREQLEN + reqlen = MAX(CONFIG_CDCACM_BULKREQLEN, ep->maxpacket); +#else + reqlen = ep->maxpacket; +#endif + + while (!sq_empty(&priv->reqlist)) + { + /* Peek at the request in the container at the head of the list */ + + reqcontainer = (struct cdcacm_req_s *)sq_peek(&priv->reqlist); + req = reqcontainer->req; + + /* Fill the request with serial TX data */ + + len = cdcacm_fillrequest(priv, req->buf, reqlen); + if (len > 0) + { + /* Remove the empty container from the request list */ + + (void)sq_remfirst(&priv->reqlist); + priv->nwrq--; + + /* Then submit the request to the endpoint */ + + req->len = len; + req->priv = reqcontainer; + req->flags = USBDEV_REQFLAGS_NULLPKT; + ret = EP_SUBMIT(ep, req); + if (ret != OK) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_SUBMITFAIL), (uint16_t)-ret); + break; + } + } + else + { + break; + } + } + + irqrestore(flags); + return ret; +} + +/**************************************************************************** + * Name: cdcacm_recvpacket + * + * Description: + * A normal completion event was received by the read completion handler + * at the interrupt level (with interrupts disabled). This function handles + * the USB packet and provides the received data to the uart RX buffer. + * + * Assumptions: + * Called from the USB interrupt handler with interrupts disabled. + * + ****************************************************************************/ + +static inline int cdcacm_recvpacket(FAR struct cdcacm_dev_s *priv, + uint8_t *reqbuf, uint16_t reqlen) +{ + FAR uart_dev_t *serdev = &priv->serdev; + FAR struct uart_buffer_s *recv = &serdev->recv; + uint16_t currhead; + uint16_t nexthead; + uint16_t nbytes = 0; + + uvdbg("head=%d tail=%d nrdq=%d reqlen=%d\n", + priv->serdev.recv.head, priv->serdev.recv.tail, priv->nrdq, reqlen); + + /* Get the next head index. During the time that RX interrupts are disabled, the + * the serial driver will be extracting data from the circular buffer and modifying + * recv.tail. During this time, we should avoid modifying recv.head; Instead we will + * use a shadow copy of the index. When interrupts are restored, the real recv.head + * will be updated with this indes. + */ + + if (priv->rxenabled) + { + currhead = recv->head; + } + else + { + currhead = priv->rxhead; + } + + /* Pre-calculate the head index and check for wrap around. We need to do this + * so that we can determine if the circular buffer will overrun BEFORE we + * overrun the buffer! + */ + + nexthead = currhead + 1; + if (nexthead >= recv->size) + { + nexthead = 0; + } + + /* Then copy data into the RX buffer until either: (1) all of the data has been + * copied, or (2) the RX buffer is full. NOTE: If the RX buffer becomes full, + * then we have overrun the serial driver and data will be lost. + */ + + while (nexthead != recv->tail && nbytes < reqlen) + { + /* Copy one byte to the head of the circular RX buffer */ + + recv->buffer[currhead] = *reqbuf++; + + /* Update counts and indices */ + + currhead = nexthead; + nbytes++; + + /* Increment the head index and check for wrap around */ + + nexthead = currhead + 1; + if (nexthead >= recv->size) + { + nexthead = 0; + } + } + + /* Write back the head pointer using the shadow index if RX "interrupts" + * are disabled. + */ + + if (priv->rxenabled) + { + recv->head = currhead; + } + else + { + priv->rxhead = currhead; + } + + /* If data was added to the incoming serial buffer, then wake up any + * threads is waiting for incoming data. If we are running in an interrupt + * handler, then the serial driver will not run until the interrupt handler + * returns. + */ + + if (priv->rxenabled && nbytes > 0) + { + uart_datareceived(serdev); + } + + /* Return an error if the entire packet could not be transferred */ + + if (nbytes < reqlen) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_RXOVERRUN), 0); + return -ENOSPC; + } + return OK; +} + +/**************************************************************************** + * Name: cdcacm_allocreq + * + * Description: + * Allocate a request instance along with its buffer + * + ****************************************************************************/ + +static struct usbdev_req_s *cdcacm_allocreq(FAR struct usbdev_ep_s *ep, + uint16_t len) +{ + FAR struct usbdev_req_s *req; + + req = EP_ALLOCREQ(ep); + if (req != NULL) + { + req->len = len; + req->buf = EP_ALLOCBUFFER(ep, len); + if (!req->buf) + { + EP_FREEREQ(ep, req); + req = NULL; + } + } + return req; +} + +/**************************************************************************** + * Name: cdcacm_freereq + * + * Description: + * Free a request instance along with its buffer + * + ****************************************************************************/ + +static void cdcacm_freereq(FAR struct usbdev_ep_s *ep, + FAR struct usbdev_req_s *req) +{ + if (ep != NULL && req != NULL) + { + if (req->buf != NULL) + { + EP_FREEBUFFER(ep, req->buf); + } + EP_FREEREQ(ep, req); + } +} + +/**************************************************************************** + * Name: cdcacm_resetconfig + * + * Description: + * Mark the device as not configured and disable all endpoints. + * + ****************************************************************************/ + +static void cdcacm_resetconfig(FAR struct cdcacm_dev_s *priv) +{ + /* Are we configured? */ + + if (priv->config != CDCACM_CONFIGIDNONE) + { + /* Yes.. but not anymore */ + + priv->config = CDCACM_CONFIGIDNONE; + + /* Disable endpoints. This should force completion of all pending + * transfers. + */ + + EP_DISABLE(priv->epintin); + EP_DISABLE(priv->epbulkin); + EP_DISABLE(priv->epbulkout); + } +} + +/**************************************************************************** + * Name: cdcacm_epconfigure + * + * Description: + * Configure one endpoint. + * + ****************************************************************************/ + +#ifdef CONFIG_USBDEV_DUALSPEED +static int cdcacm_epconfigure(FAR struct usbdev_ep_s *ep, + enum cdcacm_epdesc_e epid, uint16_t mxpacket, + bool last) +{ + struct usb_epdesc_s epdesc; + cdcacm_mkepdesc(epid, mxpacket, &epdesc); + return EP_CONFIGURE(ep, &epdesc, last); +} +#endif + +/**************************************************************************** + * Name: cdcacm_setconfig + * + * Description: + * Set the device configuration by allocating and configuring endpoints and + * by allocating and queue read and write requests. + * + ****************************************************************************/ + +static int cdcacm_setconfig(FAR struct cdcacm_dev_s *priv, uint8_t config) +{ + FAR struct usbdev_req_s *req; + int i; + int ret = 0; + +#if CONFIG_DEBUG + if (priv == NULL) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return -EIO; + } +#endif + + if (config == priv->config) + { + /* Already configured -- Do nothing */ + + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_ALREADYCONFIGURED), 0); + return 0; + } + + /* Discard the previous configuration data */ + + cdcacm_resetconfig(priv); + + /* Was this a request to simply discard the current configuration? */ + + if (config == CDCACM_CONFIGIDNONE) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_CONFIGNONE), 0); + return 0; + } + + /* We only accept one configuration */ + + if (config != CDCACM_CONFIGID) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_CONFIGIDBAD), 0); + return -EINVAL; + } + + /* Configure the IN interrupt endpoint */ + +#ifdef CONFIG_USBDEV_DUALSPEED + if (priv->usbdev->speed == USB_SPEED_HIGH) + { + ret = cdcacm_epconfigure(priv->epintin, CDCACM_EPINTIN, + CONFIG_CDCACM_EPINTIN_HSSIZE, false); + } + else +#endif + { + ret = EP_CONFIGURE(priv->epintin, + cdcacm_getepdesc(CDCACM_EPINTIN), false); + } + + if (ret < 0) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EPINTINCONFIGFAIL), 0); + goto errout; + } + priv->epintin->priv = priv; + + /* Configure the IN bulk endpoint */ + +#ifdef CONFIG_USBDEV_DUALSPEED + if (priv->usbdev->speed == USB_SPEED_HIGH) + { + ret = cdcacm_epconfigure(priv->epbulkin, CDCACM_EPBULKIN, + CONFIG_CDCACM_EPBULKIN_HSSIZE, false); + } + else +#endif + { + ret = EP_CONFIGURE(priv->epbulkin, + cdcacm_getepdesc(CDCACM_EPBULKIN), false); + } + + if (ret < 0) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EPBULKINCONFIGFAIL), 0); + goto errout; + } + + priv->epbulkin->priv = priv; + + /* Configure the OUT bulk endpoint */ + +#ifdef CONFIG_USBDEV_DUALSPEED + if (priv->usbdev->speed == USB_SPEED_HIGH) + { + ret = cdcacm_epconfigure(priv->epbulkout, CDCACM_EPBULKOUT, + CONFIG_CDCACM_EPBULKOUT_HSSIZE, true); + } + else +#endif + { + ret = EP_CONFIGURE(priv->epbulkout, + cdcacm_getepdesc(CDCACM_EPBULKOUT), true); + } + + if (ret < 0) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EPBULKOUTCONFIGFAIL), 0); + goto errout; + } + + priv->epbulkout->priv = priv; + + /* Queue read requests in the bulk OUT endpoint */ + + DEBUGASSERT(priv->nrdq == 0); + for (i = 0; i < CONFIG_CDCACM_NRDREQS; i++) + { + req = priv->rdreqs[i].req; + req->callback = cdcacm_rdcomplete; + ret = EP_SUBMIT(priv->epbulkout, req); + if (ret != OK) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_RDSUBMIT), (uint16_t)-ret); + goto errout; + } + priv->nrdq++; + } + + priv->config = config; + return OK; + +errout: + cdcacm_resetconfig(priv); + return ret; +} + +/**************************************************************************** + * Name: cdcacm_ep0incomplete + * + * Description: + * Handle completion of EP0 control operations + * + ****************************************************************************/ + +static void cdcacm_ep0incomplete(FAR struct usbdev_ep_s *ep, + FAR struct usbdev_req_s *req) +{ + if (req->result || req->xfrd != req->len) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_REQRESULT), (uint16_t)-req->result); + } +} + +/**************************************************************************** + * Name: cdcacm_rdcomplete + * + * Description: + * Handle completion of read request on the bulk OUT endpoint. This + * is handled like the receipt of serial data on the "UART" + * + ****************************************************************************/ + +static void cdcacm_rdcomplete(FAR struct usbdev_ep_s *ep, + FAR struct usbdev_req_s *req) +{ + FAR struct cdcacm_dev_s *priv; + irqstate_t flags; + int ret; + + /* Sanity check */ + +#ifdef CONFIG_DEBUG + if (!ep || !ep->priv || !req) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return; + } +#endif + + /* Extract references to private data */ + + priv = (FAR struct cdcacm_dev_s*)ep->priv; + + /* Process the received data unless this is some unusual condition */ + + flags = irqsave(); + switch (req->result) + { + case 0: /* Normal completion */ + usbtrace(TRACE_CLASSRDCOMPLETE, priv->nrdq); + cdcacm_recvpacket(priv, req->buf, req->xfrd); + break; + + case -ESHUTDOWN: /* Disconnection */ + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_RDSHUTDOWN), 0); + priv->nrdq--; + irqrestore(flags); + return; + + default: /* Some other error occurred */ + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_RDUNEXPECTED), (uint16_t)-req->result); + break; + }; + + /* Requeue the read request */ + +#ifdef CONFIG_CDCACM_BULKREQLEN + req->len = MAX(CONFIG_CDCACM_BULKREQLEN, ep->maxpacket); +#else + req->len = ep->maxpacket; +#endif + + ret = EP_SUBMIT(ep, req); + if (ret != OK) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_RDSUBMIT), (uint16_t)-req->result); + } + irqrestore(flags); +} + +/**************************************************************************** + * Name: cdcacm_wrcomplete + * + * Description: + * Handle completion of write request. This function probably executes + * in the context of an interrupt handler. + * + ****************************************************************************/ + +static void cdcacm_wrcomplete(FAR struct usbdev_ep_s *ep, + FAR struct usbdev_req_s *req) +{ + FAR struct cdcacm_dev_s *priv; + FAR struct cdcacm_req_s *reqcontainer; + irqstate_t flags; + + /* Sanity check */ + +#ifdef CONFIG_DEBUG + if (!ep || !ep->priv || !req || !req->priv) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return; + } +#endif + + /* Extract references to our private data */ + + priv = (FAR struct cdcacm_dev_s *)ep->priv; + reqcontainer = (FAR struct cdcacm_req_s *)req->priv; + + /* Return the write request to the free list */ + + flags = irqsave(); + sq_addlast((sq_entry_t*)reqcontainer, &priv->reqlist); + priv->nwrq++; + irqrestore(flags); + + /* Send the next packet unless this was some unusual termination + * condition + */ + + switch (req->result) + { + case OK: /* Normal completion */ + usbtrace(TRACE_CLASSWRCOMPLETE, priv->nwrq); + cdcacm_sndpacket(priv); + break; + + case -ESHUTDOWN: /* Disconnection */ + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_WRSHUTDOWN), priv->nwrq); + break; + + default: /* Some other error occurred */ + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_WRUNEXPECTED), (uint16_t)-req->result); + break; + } +} + +/**************************************************************************** + * USB Class Driver Methods + ****************************************************************************/ + +/**************************************************************************** + * Name: cdcacm_bind + * + * Description: + * Invoked when the driver is bound to a USB device driver + * + ****************************************************************************/ + +static int cdcacm_bind(FAR struct usbdevclass_driver_s *driver, + FAR struct usbdev_s *dev) +{ + FAR struct cdcacm_dev_s *priv = ((FAR struct cdcacm_driver_s*)driver)->dev; + FAR struct cdcacm_req_s *reqcontainer; + irqstate_t flags; + uint16_t reqlen; + int ret; + int i; + + usbtrace(TRACE_CLASSBIND, 0); + + /* Bind the structures */ + + priv->usbdev = dev; + + /* Save the reference to our private data structure in EP0 so that it + * can be recovered in ep0 completion events (Unless we are part of + * a composite device and, in that case, the composite device owns + * EP0). + */ + +#ifndef CONFIG_USBMSC_COMPOSITE + dev->ep0->priv = priv; +#endif + + /* Preallocate control request */ + + priv->ctrlreq = cdcacm_allocreq(dev->ep0, CDCACM_MXDESCLEN); + if (priv->ctrlreq == NULL) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_ALLOCCTRLREQ), 0); + ret = -ENOMEM; + goto errout; + } + priv->ctrlreq->callback = cdcacm_ep0incomplete; + + /* Pre-allocate all endpoints... the endpoints will not be functional + * until the SET CONFIGURATION request is processed in cdcacm_setconfig. + * This is done here because there may be calls to kmalloc and the SET + * CONFIGURATION processing probably occurrs within interrupt handling + * logic where kmalloc calls will fail. + */ + + /* Pre-allocate the IN interrupt endpoint */ + + priv->epintin = DEV_ALLOCEP(dev, CDCACM_EPINTIN_ADDR, true, USB_EP_ATTR_XFER_INT); + if (!priv->epintin) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EPINTINALLOCFAIL), 0); + ret = -ENODEV; + goto errout; + } + priv->epintin->priv = priv; + + /* Pre-allocate the IN bulk endpoint */ + + priv->epbulkin = DEV_ALLOCEP(dev, CDCACM_EPINBULK_ADDR, true, USB_EP_ATTR_XFER_BULK); + if (!priv->epbulkin) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EPBULKINALLOCFAIL), 0); + ret = -ENODEV; + goto errout; + } + priv->epbulkin->priv = priv; + + /* Pre-allocate the OUT bulk endpoint */ + + priv->epbulkout = DEV_ALLOCEP(dev, CDCACM_EPOUTBULK_ADDR, false, USB_EP_ATTR_XFER_BULK); + if (!priv->epbulkout) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EPBULKOUTALLOCFAIL), 0); + ret = -ENODEV; + goto errout; + } + priv->epbulkout->priv = priv; + + /* Pre-allocate read requests */ + +#ifdef CONFIG_CDCACM_BULKREQLEN + reqlen = MAX(CONFIG_CDCACM_BULKREQLEN, priv->epbulkout->maxpacket); +#else + reqlen = priv->epbulkout->maxpacket; +#endif + + for (i = 0; i < CONFIG_CDCACM_NRDREQS; i++) + { + reqcontainer = &priv->rdreqs[i]; + reqcontainer->req = cdcacm_allocreq(priv->epbulkout, reqlen); + if (reqcontainer->req == NULL) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_RDALLOCREQ), -ENOMEM); + ret = -ENOMEM; + goto errout; + } + reqcontainer->req->priv = reqcontainer; + reqcontainer->req->callback = cdcacm_rdcomplete; + } + + /* Pre-allocate write request containers and put in a free list */ + +#ifdef CONFIG_CDCACM_BULKREQLEN + reqlen = MAX(CONFIG_CDCACM_BULKREQLEN, priv->epbulkin->maxpacket); +#else + reqlen = priv->epbulkin->maxpacket; +#endif + + for (i = 0; i < CONFIG_CDCACM_NWRREQS; i++) + { + reqcontainer = &priv->wrreqs[i]; + reqcontainer->req = cdcacm_allocreq(priv->epbulkin, reqlen); + if (reqcontainer->req == NULL) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_WRALLOCREQ), -ENOMEM); + ret = -ENOMEM; + goto errout; + } + reqcontainer->req->priv = reqcontainer; + reqcontainer->req->callback = cdcacm_wrcomplete; + + flags = irqsave(); + sq_addlast((sq_entry_t*)reqcontainer, &priv->reqlist); + priv->nwrq++; /* Count of write requests available */ + irqrestore(flags); + } + + /* Report if we are selfpowered (unless we are part of a composite device) */ + +#ifndef CONFIG_CDCACM_COMPOSITE +#ifdef CONFIG_USBDEV_SELFPOWERED + DEV_SETSELFPOWERED(dev); +#endif + + /* And pull-up the data line for the soft connect function (unless we are + * part of a composite device) + */ + + DEV_CONNECT(dev); +#endif + return OK; + +errout: + cdcacm_unbind(driver, dev); + return ret; +} + +/**************************************************************************** + * Name: cdcacm_unbind + * + * Description: + * Invoked when the driver is unbound from a USB device driver + * + ****************************************************************************/ + +static void cdcacm_unbind(FAR struct usbdevclass_driver_s *driver, + FAR struct usbdev_s *dev) +{ + FAR struct cdcacm_dev_s *priv; + FAR struct cdcacm_req_s *reqcontainer; + irqstate_t flags; + int i; + + usbtrace(TRACE_CLASSUNBIND, 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; + +#ifdef CONFIG_DEBUG + if (!priv) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EP0NOTBOUND), 0); + return; + } +#endif + + /* Make sure that we are not already unbound */ + + if (priv != NULL) + { + /* Make sure that the endpoints have been unconfigured. If + * we were terminated gracefully, then the configuration should + * already have been reset. If not, then calling cdcacm_resetconfig + * should cause the endpoints to immediately terminate all + * transfers and return the requests to us (with result == -ESHUTDOWN) + */ + + cdcacm_resetconfig(priv); + up_mdelay(50); + + /* Free the interrupt IN endpoint */ + + if (priv->epintin) + { + DEV_FREEEP(dev, priv->epintin); + priv->epintin = NULL; + } + + /* Free the bulk IN endpoint */ + + if (priv->epbulkin) + { + DEV_FREEEP(dev, priv->epbulkin); + priv->epbulkin = NULL; + } + + /* Free the pre-allocated control request */ + + if (priv->ctrlreq != NULL) + { + cdcacm_freereq(dev->ep0, priv->ctrlreq); + priv->ctrlreq = NULL; + } + + /* Free pre-allocated read requests (which should all have + * been returned to the free list at this time -- we don't check) + */ + + DEBUGASSERT(priv->nrdq == 0); + for (i = 0; i < CONFIG_CDCACM_NRDREQS; i++) + { + reqcontainer = &priv->rdreqs[i]; + if (reqcontainer->req) + { + cdcacm_freereq(priv->epbulkout, reqcontainer->req); + reqcontainer->req = NULL; + } + } + + /* Free the bulk OUT endpoint */ + + if (priv->epbulkout) + { + DEV_FREEEP(dev, priv->epbulkout); + priv->epbulkout = NULL; + } + + /* Free write requests that are not in use (which should be all + * of them) + */ + + flags = irqsave(); + DEBUGASSERT(priv->nwrq == CONFIG_CDCACM_NWRREQS); + while (!sq_empty(&priv->reqlist)) + { + reqcontainer = (struct cdcacm_req_s *)sq_remfirst(&priv->reqlist); + if (reqcontainer->req != NULL) + { + cdcacm_freereq(priv->epbulkin, reqcontainer->req); + priv->nwrq--; /* Number of write requests queued */ + } + } + DEBUGASSERT(priv->nwrq == 0); + irqrestore(flags); + } + + /* Clear out all data in the circular buffer */ + + priv->serdev.xmit.head = 0; + priv->serdev.xmit.tail = 0; +} + +/**************************************************************************** + * Name: cdcacm_setup + * + * Description: + * Invoked for ep0 control requests. This function probably executes + * in the context of an interrupt handler. + * + ****************************************************************************/ + +static int cdcacm_setup(FAR struct usbdevclass_driver_s *driver, + FAR struct usbdev_s *dev, + FAR const struct usb_ctrlreq_s *ctrl, + FAR uint8_t *dataout, size_t outlen) +{ + FAR struct cdcacm_dev_s *priv; + FAR struct usbdev_req_s *ctrlreq; + uint16_t value; + uint16_t index; + uint16_t len; + int ret = -EOPNOTSUPP; + +#ifdef CONFIG_DEBUG + if (!driver || !dev || !ctrl) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return -EIO; + } +#endif + + /* Extract reference to private data */ + + usbtrace(TRACE_CLASSSETUP, ctrl->req); + priv = ((FAR struct cdcacm_driver_s*)driver)->dev; + +#ifdef CONFIG_DEBUG + if (!priv || !priv->ctrlreq) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EP0NOTBOUND), 0); + return -ENODEV; + } +#endif + ctrlreq = priv->ctrlreq; + + /* Extract the little-endian 16-bit values to host order */ + + value = GETUINT16(ctrl->value); + index = GETUINT16(ctrl->index); + len = GETUINT16(ctrl->len); + + uvdbg("type=%02x req=%02x value=%04x index=%04x len=%04x\n", + ctrl->type, ctrl->req, value, index, len); + + if ((ctrl->type & USB_REQ_TYPE_MASK) == USB_REQ_TYPE_STANDARD) + { + /*********************************************************************** + * Standard Requests + ***********************************************************************/ + + switch (ctrl->req) + { + case USB_REQ_GETDESCRIPTOR: + { + /* The value field specifies the descriptor type in the MS byte and the + * descriptor index in the LS byte (order is little endian) + */ + + switch (ctrl->value[1]) + { + /* If the serial device is used in as part of a composite device, + * then the device descriptor is provided by logic in the composite + * device implementation. + */ + +#ifndef CONFIG_CDCACM_COMPOSITE + case USB_DESC_TYPE_DEVICE: + { + ret = USB_SIZEOF_DEVDESC; + memcpy(ctrlreq->buf, cdcacm_getdevdesc(), ret); + } + break; +#endif + + /* If the serial device is used in as part of a composite device, + * then the device qualifier descriptor is provided by logic in the + * composite device implementation. + */ + +#if !defined(CONFIG_CDCACM_COMPOSITE) && defined(CONFIG_USBDEV_DUALSPEED) + case USB_DESC_TYPE_DEVICEQUALIFIER: + { + ret = USB_SIZEOF_QUALDESC; + memcpy(ctrlreq->buf, cdcacm_getqualdesc(), ret); + } + break; + + case USB_DESC_TYPE_OTHERSPEEDCONFIG: +#endif + + /* If the serial device is used in as part of a composite device, + * then the configuration descriptor is provided by logic in the + * composite device implementation. + */ + +#ifndef CONFIG_CDCACM_COMPOSITE + case USB_DESC_TYPE_CONFIG: + { +#ifdef CONFIG_USBDEV_DUALSPEED + ret = cdcacm_mkcfgdesc(ctrlreq->buf, dev->speed, ctrl->req); +#else + ret = cdcacm_mkcfgdesc(ctrlreq->buf); +#endif + } + break; +#endif + + /* If the serial device is used in as part of a composite device, + * then the language string descriptor is provided by logic in the + * composite device implementation. + */ + +#ifndef CONFIG_CDCACM_COMPOSITE + case USB_DESC_TYPE_STRING: + { + /* index == language code. */ + + ret = cdcacm_mkstrdesc(ctrl->value[0], (struct usb_strdesc_s *)ctrlreq->buf); + } + break; +#endif + + default: + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_GETUNKNOWNDESC), value); + } + break; + } + } + break; + + case USB_REQ_SETCONFIGURATION: + { + if (ctrl->type == 0) + { + ret = cdcacm_setconfig(priv, value); + } + } + break; + + /* If the serial device is used in as part of a composite device, + * then the overall composite class configuration is managed by logic + * in the composite device implementation. + */ + +#ifndef CONFIG_CDCACM_COMPOSITE + case USB_REQ_GETCONFIGURATION: + { + if (ctrl->type == USB_DIR_IN) + { + *(uint8_t*)ctrlreq->buf = priv->config; + ret = 1; + } + } + break; +#endif + + case USB_REQ_SETINTERFACE: + { + if (ctrl->type == USB_REQ_RECIPIENT_INTERFACE && + priv->config == CDCACM_CONFIGID) + { + if ((index == CDCACM_NOTIFID && value == CDCACM_NOTALTIFID) || + (index == CDCACM_DATAIFID && value == CDCACM_DATAALTIFID)) + { + cdcacm_resetconfig(priv); + cdcacm_setconfig(priv, priv->config); + ret = 0; + } + } + } + break; + + case USB_REQ_GETINTERFACE: + { + if (ctrl->type == (USB_DIR_IN|USB_REQ_RECIPIENT_INTERFACE) && + priv->config == CDCACM_CONFIGIDNONE) + { + if ((index == CDCACM_NOTIFID && value == CDCACM_NOTALTIFID) || + (index == CDCACM_DATAIFID && value == CDCACM_DATAALTIFID)) + { + *(uint8_t*) ctrlreq->buf = value; + ret = 1; + } + else + { + ret = -EDOM; + } + } + } + break; + + default: + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDSTDREQ), ctrl->req); + break; + } + } + + else if ((ctrl->type & USB_REQ_TYPE_MASK) == USB_REQ_TYPE_CLASS) + { + /*********************************************************************** + * CDC ACM-Specific Requests + ***********************************************************************/ + + switch (ctrl->req) + { + /* ACM_GET_LINE_CODING requests current DTE rate, stop-bits, parity, and + * number-of-character bits. (Optional) + */ + + case ACM_GET_LINE_CODING: + { + if (ctrl->type == (USB_DIR_IN|USB_REQ_TYPE_CLASS|USB_REQ_RECIPIENT_INTERFACE) && + index == CDCACM_NOTIFID) + { + /* Return the current line status from the private data structure */ + + memcpy(ctrlreq->buf, &priv->linecoding, SIZEOF_CDC_LINECODING); + ret = SIZEOF_CDC_LINECODING; + } + else + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDCLASSREQ), ctrl->type); + } + } + break; + + /* ACM_SET_LINE_CODING configures DTE rate, stop-bits, parity, and + * number-of-character bits. (Optional) + */ + + case ACM_SET_LINE_CODING: + { + if (ctrl->type == (USB_DIR_OUT|USB_REQ_TYPE_CLASS|USB_REQ_RECIPIENT_INTERFACE) && + len == SIZEOF_CDC_LINECODING && /* dataout && len == outlen && */ + index == CDCACM_NOTIFID) + { + /* Save the new line coding in the private data structure. NOTE: + * that this is conditional now because not all device controller + * drivers supported provisioni of EP0 OUT data with the setup + * command. + */ + + if (dataout && len <= SIZEOF_CDC_LINECODING) /* REVISIT */ + { + memcpy(&priv->linecoding, dataout, SIZEOF_CDC_LINECODING); + } + ret = 0; + + /* If there is a registered callback to receive line status info, then + * callout now. + */ + + if (priv->callback) + { + priv->callback(CDCACM_EVENT_LINECODING); + } + } + else + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDCLASSREQ), ctrl->type); + } + } + break; + + /* ACM_SET_CTRL_LINE_STATE: RS-232 signal used to tell the DCE device the + * DTE device is now present. (Optional) + */ + + case ACM_SET_CTRL_LINE_STATE: + { + if (ctrl->type == (USB_DIR_OUT|USB_REQ_TYPE_CLASS|USB_REQ_RECIPIENT_INTERFACE) && + index == CDCACM_NOTIFID) + { + /* Save the control line state in the private data structure. Only bits + * 0 and 1 have meaning. + */ + + priv->ctrlline = value & 3; + ret = 0; + + /* If there is a registered callback to receive control line status info, + * then callout now. + */ + + if (priv->callback) + { + priv->callback(CDCACM_EVENT_CTRLLINE); + } + } + else + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDCLASSREQ), ctrl->type); + } + } + break; + + /* Sends special carrier*/ + + case ACM_SEND_BREAK: + { + if (ctrl->type == (USB_DIR_OUT|USB_REQ_TYPE_CLASS|USB_REQ_RECIPIENT_INTERFACE) && + index == CDCACM_NOTIFID) + { + /* If there is a registered callback to handle the SendBreak request, + * then callout now. + */ + + ret = 0; + if (priv->callback) + { + priv->callback(CDCACM_EVENT_SENDBREAK); + } + } + else + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDCLASSREQ), ctrl->type); + } + } + break; + + default: + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDCLASSREQ), ctrl->req); + break; + } + } + else + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDTYPE), ctrl->type); + } + + /* Respond to the setup command if data was returned. On an error return + * value (ret < 0), the USB driver will stall. + */ + + if (ret >= 0) + { + /* Configure the response */ + + ctrlreq->len = MIN(len, ret); + ctrlreq->flags = USBDEV_REQFLAGS_NULLPKT; + + /* Send the response -- either directly to the USB controller or + * indirectly in the case where this class is a member of a composite + * device. + */ + +#ifndef CONFIG_CDCACM_COMPOSITE + ret = EP_SUBMIT(dev->ep0, ctrlreq); +#else + ret = composite_ep0submit(driver, dev, ctrlreq); +#endif + if (ret < 0) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EPRESPQ), (uint16_t)-ret); + ctrlreq->result = OK; + cdcacm_ep0incomplete(dev->ep0, ctrlreq); + } + } + return ret; +} + +/**************************************************************************** + * Name: cdcacm_disconnect + * + * Description: + * Invoked after all transfers have been stopped, when the host is + * disconnected. This function is probably called from the context of an + * interrupt handler. + * + ****************************************************************************/ + +static void cdcacm_disconnect(FAR struct usbdevclass_driver_s *driver, + FAR struct usbdev_s *dev) +{ + FAR struct cdcacm_dev_s *priv; + irqstate_t flags; + + usbtrace(TRACE_CLASSDISCONNECT, 0); + +#ifdef CONFIG_DEBUG + if (!driver || !dev || !dev->ep0) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return; + } +#endif + + /* Extract reference to private data */ + + priv = ((FAR struct cdcacm_driver_s*)driver)->dev; + +#ifdef CONFIG_DEBUG + if (!priv) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EP0NOTBOUND), 0); + return; + } +#endif + + /* Reset the configuration */ + + flags = irqsave(); + cdcacm_resetconfig(priv); + + /* Clear out all data in the circular buffer */ + + priv->serdev.xmit.head = 0; + priv->serdev.xmit.tail = 0; + irqrestore(flags); + + /* Perform the soft connect function so that we will we can be + * re-enumerated (unless we are part of a composite device) + */ + +#ifndef CONFIG_CDCACM_COMPOSITE + DEV_CONNECT(dev); +#endif +} + +/**************************************************************************** + * Serial Device Methods + ****************************************************************************/ + +/**************************************************************************** + * Name: cdcuart_setup + * + * Description: + * This method is called the first time that the serial port is opened. + * + ****************************************************************************/ + +static int cdcuart_setup(FAR struct uart_dev_s *dev) +{ + FAR struct cdcacm_dev_s *priv; + + usbtrace(CDCACM_CLASSAPI_SETUP, 0); + + /* Sanity check */ + +#if CONFIG_DEBUG + if (!dev || !dev->priv) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return -EIO; + } +#endif + + /* Extract reference to private data */ + + priv = (FAR struct cdcacm_dev_s*)dev->priv; + + /* Check if we have been configured */ + + if (priv->config == CDCACM_CONFIGIDNONE) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_SETUPNOTCONNECTED), 0); + return -ENOTCONN; + } + + return OK; +} + +/**************************************************************************** + * Name: cdcuart_shutdown + * + * Description: + * This method is called when the serial port is closed. This operation + * is very simple for the USB serial backend because the serial driver + * has already assured that the TX data has full drained -- it calls + * cdcuart_txempty() until that function returns true before calling this + * function. + * + ****************************************************************************/ + +static void cdcuart_shutdown(FAR struct uart_dev_s *dev) +{ + usbtrace(CDCACM_CLASSAPI_SHUTDOWN, 0); + + /* Sanity check */ + +#if CONFIG_DEBUG + if (!dev || !dev->priv) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + } +#endif +} + +/**************************************************************************** + * Name: cdcuart_attach + * + * Description: + * Does not apply to the USB serial class device + * + ****************************************************************************/ + +static int cdcuart_attach(FAR struct uart_dev_s *dev) +{ + usbtrace(CDCACM_CLASSAPI_ATTACH, 0); + return OK; +} + +/**************************************************************************** + * Name: cdcuart_detach + * + * Description: +* Does not apply to the USB serial class device + * + ****************************************************************************/ + +static void cdcuart_detach(FAR struct uart_dev_s *dev) +{ + usbtrace(CDCACM_CLASSAPI_DETACH, 0); +} + +/**************************************************************************** + * Name: cdcuart_ioctl + * + * Description: + * All ioctl calls will be routed through this method + * + ****************************************************************************/ + +static int cdcuart_ioctl(FAR struct file *filep,int cmd,unsigned long arg) +{ + struct inode *inode = filep->f_inode; + struct cdcacm_dev_s *priv = inode->i_private; + int ret = OK; + + switch (cmd) + { + /* CAICO_REGISTERCB + * Register a callback for serial event notification. Argument: + * cdcacm_callback_t. See cdcacm_callback_t type definition below. + * NOTE: The callback will most likely invoked at the interrupt level. + * The called back function should, therefore, limit its operations to + * invoking some kind of IPC to handle the serial event in some normal + * task environment. + */ + + case CAIOC_REGISTERCB: + { + /* Save the new callback function */ + + priv->callback = (cdcacm_callback_t)((uintptr_t)arg); + } + break; + + /* CAIOC_GETLINECODING + * Get current line coding. Argument: struct cdc_linecoding_s*. + * See include/nuttx/usb/cdc.h for structure definition. This IOCTL + * should be called to get the data associated with the + * CDCACM_EVENT_LINECODING event). + */ + + case CAIOC_GETLINECODING: + { + FAR struct cdc_linecoding_s *ptr = (FAR struct cdc_linecoding_s *)((uintptr_t)arg); + if (ptr) + { + memcpy(ptr, &priv->linecoding, sizeof(struct cdc_linecoding_s)); + } + else + { + ret = -EINVAL; + } + } + break; + + /* CAIOC_GETCTRLLINE + * Get control line status bits. Argument FAR int*. See + * include/nuttx/usb/cdc.h for bit definitions. This IOCTL should be + * called to get the data associated CDCACM_EVENT_CTRLLINE event. + */ + + case CAIOC_GETCTRLLINE: + { + FAR int *ptr = (FAR int *)((uintptr_t)arg); + if (ptr) + { + *ptr = priv->ctrlline; + } + else + { + ret = -EINVAL; + } + } + break; + + /* CAIOC_NOTIFY + * Send a serial state to the host via the Interrupt IN endpoint. + * Argument: int. This includes the current state of the carrier detect, + * DSR, break, and ring signal. See "Table 69: UART State Bitmap Values" + * and CDC_UART_definitions in include/nuttx/usb/cdc.h. + */ + + case CAIOC_NOTIFY: + { + /* Not yet implemented. I probably won't bother to implement until + * I comr up with a usage model that needs it. + * + * Here is what the needs to be done: + * + * 1. Format and send a request header with: + * + * bmRequestType: + * USB_REQ_DIR_IN|USB_REQ_TYPE_CLASS|USB_REQ_RECIPIENT_INTERFACE + * bRequest: ACM_SERIAL_STATE + * wValue: 0 + * wIndex: 0 + * wLength: Length of data + * + * 2. Followed by the notification data (in a separate packet) + */ + + ret = -ENOSYS; + } + break; + + default: + ret = -ENOTTY; + break; + } + + return ret; +} + +/**************************************************************************** + * Name: cdcuart_rxint + * + * Description: + * Called by the serial driver to enable or disable RX interrupts. We, of + * course, have no RX interrupts but must behave consistently. This method + * is called under the conditions: + * + * 1. With enable==true when the port is opened (just after cdcuart_setup + * and cdcuart_attach are called called) + * 2. With enable==false while transferring data from the RX buffer + * 2. With enable==true while waiting for more incoming data + * 3. With enable==false when the port is closed (just before cdcuart_detach + * and cdcuart_shutdown are called). + * + ****************************************************************************/ + +static void cdcuart_rxint(FAR struct uart_dev_s *dev, bool enable) +{ + FAR struct cdcacm_dev_s *priv; + FAR uart_dev_t *serdev; + irqstate_t flags; + + usbtrace(CDCACM_CLASSAPI_RXINT, (uint16_t)enable); + + /* Sanity check */ + +#if CONFIG_DEBUG + if (!dev || !dev->priv) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return; + } +#endif + + /* Extract reference to private data */ + + priv = (FAR struct cdcacm_dev_s*)dev->priv; + serdev = &priv->serdev; + + /* We need exclusive access to the RX buffer and private structure + * in the following. + */ + + flags = irqsave(); + if (enable) + { + /* RX "interrupts" are enabled. Is this a transition from disabled + * to enabled state? + */ + + if (!priv->rxenabled) + { + /* Yes. During the time that RX interrupts are disabled, the + * the serial driver will be extracting data from the circular + * buffer and modifying recv.tail. During this time, we + * should avoid modifying recv.head; When interrupts are restored, + * we can update the head pointer for all of the data that we + * put into cicular buffer while "interrupts" were disabled. + */ + + if (priv->rxhead != serdev->recv.head) + { + serdev->recv.head = priv->rxhead; + + /* Yes... signal the availability of new data */ + + uart_datareceived(serdev); + } + + /* RX "interrupts are no longer disabled */ + + priv->rxenabled = true; + } + } + + /* RX "interrupts" are disabled. Is this a transition from enabled + * to disabled state? + */ + + else if (priv->rxenabled) + { + /* Yes. During the time that RX interrupts are disabled, the + * the serial driver will be extracting data from the circular + * buffer and modifying recv.tail. During this time, we + * should avoid modifying recv.head; When interrupts are disabled, + * we use a shadow index and continue adding data to the circular + * buffer. + */ + + priv->rxhead = serdev->recv.head; + priv->rxenabled = false; + } + irqrestore(flags); +} + +/**************************************************************************** + * Name: cdcuart_txint + * + * Description: + * Called by the serial driver to enable or disable TX interrupts. We, of + * course, have no TX interrupts but must behave consistently. Initially, + * TX interrupts are disabled. This method is called under the conditions: + * + * 1. With enable==false while transferring data into the TX buffer + * 2. With enable==true when data may be taken from the buffer. + * 3. With enable==false when the TX buffer is empty + * + ****************************************************************************/ + +static void cdcuart_txint(FAR struct uart_dev_s *dev, bool enable) +{ + FAR struct cdcacm_dev_s *priv; + + usbtrace(CDCACM_CLASSAPI_TXINT, (uint16_t)enable); + + /* Sanity checks */ + +#if CONFIG_DEBUG + if (!dev || !dev->priv) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return; + } +#endif + + /* Extract references to private data */ + + priv = (FAR struct cdcacm_dev_s*)dev->priv; + + /* If the new state is enabled and if there is data in the XMIT buffer, + * send the next packet now. + */ + + uvdbg("enable=%d head=%d tail=%d\n", + enable, priv->serdev.xmit.head, priv->serdev.xmit.tail); + + if (enable && priv->serdev.xmit.head != priv->serdev.xmit.tail) + { + cdcacm_sndpacket(priv); + } +} + +/**************************************************************************** + * Name: cdcuart_txempty + * + * Description: + * Return true when all data has been sent. This is called from the + * serial driver when the driver is closed. It will call this API + * periodically until it reports true. NOTE that the serial driver takes all + * responsibility for flushing TX data through the hardware so we can be + * a bit sloppy about that. + * + ****************************************************************************/ + +static bool cdcuart_txempty(FAR struct uart_dev_s *dev) +{ + FAR struct cdcacm_dev_s *priv = (FAR struct cdcacm_dev_s*)dev->priv; + + usbtrace(CDCACM_CLASSAPI_TXEMPTY, 0); + +#if CONFIG_DEBUG + if (!priv) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0); + return true; + } +#endif + + /* When all of the allocated write requests have been returned to the + * reqlist, then there is no longer any TX data in flight. + */ + + return priv->nwrq >= CONFIG_CDCACM_NWRREQS; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: cdcacm_classobject + * + * Description: + * Register USB serial port (and USB serial console if so configured) and + * return the class object. + * + * Input Parameter: + * minor - Device minor number. E.g., minor 0 would correspond to + * /dev/ttyACM0. + * classdev - The location to return the CDC serial class' device + * instance. + * + * Returned Value: + * A pointer to the allocated class object (NULL on failure). + * + ****************************************************************************/ + +#ifndef CONFIG_CDCACM_COMPOSITE +static +#endif +int cdcacm_classobject(int minor, FAR struct usbdevclass_driver_s **classdev) +{ + FAR struct cdcacm_alloc_s *alloc; + FAR struct cdcacm_dev_s *priv; + FAR struct cdcacm_driver_s *drvr; + char devname[CDCACM_DEVNAME_SIZE]; + int ret; + + /* Allocate the structures needed */ + + alloc = (FAR struct cdcacm_alloc_s*)kmalloc(sizeof(struct cdcacm_alloc_s)); + if (!alloc) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_ALLOCDEVSTRUCT), 0); + return -ENOMEM; + } + + /* Convenience pointers into the allocated blob */ + + priv = &alloc->dev; + drvr = &alloc->drvr; + + /* Initialize the USB serial driver structure */ + + memset(priv, 0, sizeof(struct cdcacm_dev_s)); + sq_init(&priv->reqlist); + + priv->minor = minor; + + /* Fake line status */ + + priv->linecoding.baud[0] = (115200) & 0xff; /* Baud=115200 */ + priv->linecoding.baud[1] = (115200 >> 8) & 0xff; + priv->linecoding.baud[2] = (115200 >> 16) & 0xff; + priv->linecoding.baud[3] = (115200 >> 24) & 0xff; + priv->linecoding.stop = CDC_CHFMT_STOP1; /* One stop bit */ + priv->linecoding.parity = CDC_PARITY_NONE; /* No parity */ + priv->linecoding.nbits = 8; /* 8 data bits */ + + /* Initialize the serial driver sub-structure */ + + priv->serdev.recv.size = CONFIG_CDCACM_RXBUFSIZE; + priv->serdev.recv.buffer = priv->rxbuffer; + priv->serdev.xmit.size = CONFIG_CDCACM_TXBUFSIZE; + priv->serdev.xmit.buffer = priv->txbuffer; + priv->serdev.ops = &g_uartops; + priv->serdev.priv = priv; + + /* Initialize the USB class driver structure */ + +#ifdef CONFIG_USBDEV_DUALSPEED + drvr->drvr.speed = USB_SPEED_HIGH; +#else + drvr->drvr.speed = USB_SPEED_FULL; +#endif + drvr->drvr.ops = &g_driverops; + drvr->dev = priv; + + /* Register the USB serial console */ + +#ifdef CONFIG_CDCACM_CONSOLE + priv->serdev.isconsole = true; + ret = uart_register("/dev/console", &priv->serdev); + if (ret < 0) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_CONSOLEREGISTER), (uint16_t)-ret); + goto errout_with_class; + } +#endif + + /* Register the CDC/ACM TTY device */ + + sprintf(devname, CDCACM_DEVNAME_FORMAT, minor); + ret = uart_register(devname, &priv->serdev); + if (ret < 0) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UARTREGISTER), (uint16_t)-ret); + goto errout_with_class; + } + + *classdev = &drvr->drvr; + return OK; + +errout_with_class: + kfree(alloc); + return ret; +} + +/**************************************************************************** + * Name: cdcacm_initialize + * + * Description: + * Register USB serial port (and USB serial console if so configured). + * + * Input Parameter: + * minor - Device minor number. E.g., minor 0 would correspond to + * /dev/ttyACM0. + * handle - An optional opaque reference to the CDC/ACM class object that + * may subsequently be used with cdcacm_uninitialize(). + * + * Returned Value: + * Zero (OK) means that the driver was successfully registered. On any + * failure, a negated errno value is retured. + * + ****************************************************************************/ + +#ifndef CONFIG_CDCACM_COMPOSITE +int cdcacm_initialize(int minor, FAR void **handle) +{ + FAR struct usbdevclass_driver_s *drvr = NULL; + int ret; + + /* Get an instance of the serial driver class object */ + + ret = cdcacm_classobject(minor, &drvr); + if (ret == OK) + { + /* Register the USB serial class driver */ + + ret = usbdev_register(drvr); + if (ret < 0) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_DEVREGISTER), (uint16_t)-ret); + } + } + + /* Return the driver instance (if any) if the caller has requested it + * by provided a pointer to the location to return it. + */ + + if (handle) + { + *handle = (FAR void*)drvr; + } + + return ret; +} +#endif + +/**************************************************************************** + * Name: cdcacm_uninitialize + * + * Description: + * Un-initialize the USB storage class driver. This function is used + * internally by the USB composite driver to unitialized the CDC/ACM + * driver. This same interface is available (with an untyped input + * parameter) when the CDC/ACM driver is used standalone. + * + * Input Parameters: + * There is one parameter, it differs in typing depending upon whether the + * CDC/ACM driver is an internal part of a composite device, or a standalone + * USB driver: + * + * classdev - The class object returned by board_cdcclassobject() or + * cdcacm_classobject() + * handle - The opaque handle represetning the class object returned by + * a previous call to cdcacm_initialize(). + * + * Returned Value: + * None + * + ****************************************************************************/ + +#ifdef CONFIG_CDCACM_COMPOSITE +void cdcacm_uninitialize(FAR struct usbdevclass_driver_s *classdev) +#else +void cdcacm_uninitialize(FAR void *handle) +#endif +{ +#ifdef CONFIG_CDCACM_COMPOSITE + FAR struct cdcacm_driver_s *drvr = (FAR struct cdcacm_driver_s *)classdev; +#else + FAR struct cdcacm_driver_s *drvr = (FAR struct cdcacm_driver_s *)handle; +#endif + FAR struct cdcacm_dev_s *priv = drvr->dev; + char devname[CDCACM_DEVNAME_SIZE]; + int ret; + + /* Un-register the CDC/ACM TTY device */ + + sprintf(devname, CDCACM_DEVNAME_FORMAT, priv->minor); + ret = unregister_driver(devname); + if (ret < 0) + { + usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UARTUNREGISTER), (uint16_t)-ret); + } + + /* Unregister the driver (unless we are a part of a composite device). The + * device unregister logic will (1) return all of the requests to us then + * (2) all the unbind method. + * + * The same thing will happen in the composite case except that: (1) the + * composite driver will call usbdev_unregister() which will (2) return the + * requests for all members of the composite, and (3) call the unbind + * method in the composite device which will (4) call the unbind method + * for this device. + */ + +#ifndef CONFIG_CDCACM_COMPOSITE + usbdev_unregister(&drvr->drvr); +#endif + + /* And free the driver structure */ + + kfree(priv); +} |