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px4-firmware/nuttx/drivers/usbdev/pl2303.c

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/****************************************************************************
* drivers/usbdev/pl2303.c
*
* Copyright (C) 2008-2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* This logic emulates the Prolific PL2303 serial/USB converter
*
* 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/usbdev.h>
#include <nuttx/usb/usbdev_trace.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Number of requests in the write queue */
#ifndef CONFIG_PL2303_NWRREQS
# define CONFIG_PL2303_NWRREQS 4
#endif
/* Number of requests in the read queue */
#ifndef CONFIG_PL2303_NRDREQS
# define CONFIG_PL2303_NRDREQS 4
#endif
/* Logical endpoint numbers / max packet sizes */
#ifndef CONFIG_PL2303_EPINTIN
# warning "EPINTIN not defined in the configuration"
# define CONFIG_PL2303_EPINTIN 1
#endif
#ifndef CONFIG_PL2303_EPBULKOUT
# warning "EPBULKOUT not defined in the configuration"
# define CONFIG_PL2303_EPBULKOUT 2
#endif
#ifndef CONFIG_PL2303_EPBULKIN
# warning "EPBULKIN not defined in the configuration"
# define CONFIG_PL2303_EPBULKIN 3
#endif
/* Packet and request buffer sizes */
#ifndef CONFIG_PL2303_EP0MAXPACKET
# define CONFIG_PL2303_EP0MAXPACKET 64
#endif
#undef CONFIG_PL2303_BULKREQLEN
/* Vendor and product IDs and strings */
#ifndef CONFIG_PL2303_VENDORID
# define CONFIG_PL2303_VENDORID 0x067b
#endif
#ifndef CONFIG_PL2303_PRODUCTID
# define CONFIG_PL2303_PRODUCTID 0x2303
#endif
#ifndef CONFIG_PL2303_VENDORSTR
# warning "No Vendor string specified"
# define CONFIG_PL2303_VENDORSTR "NuttX"
#endif
#ifndef CONFIG_PL2303_PRODUCTSTR
# warning "No Product string specified"
# define CONFIG_PL2303_PRODUCTSTR "USBdev Serial"
#endif
#undef CONFIG_PL2303_SERIALSTR
#define CONFIG_PL2303_SERIALSTR "0"
#undef CONFIG_PL2303_CONFIGSTR
#define CONFIG_PL2303_CONFIGSTR "Bulk"
/* USB Controller */
#ifndef CONFIG_USBDEV_SELFPOWERED
# define SELFPOWERED USB_CONFIG_ATT_SELFPOWER
#else
# define SELFPOWERED (0)
#endif
#ifndef CONFIG_USBDEV_REMOTEWAKEUP
# define REMOTEWAKEUP USB_CONFIG_ATTR_WAKEUP
#else
# define REMOTEWAKEUP (0)
#endif
#ifndef CONFIG_USBDEV_MAXPOWER
# define CONFIG_USBDEV_MAXPOWER 100
#endif
/* Descriptors ****************************************************************/
/* These settings are not modifiable via the NuttX configuration */
#define PL2303_VERSIONNO (0x0202) /* Device version number */
#define PL2303_CONFIGIDNONE (0) /* Config ID means to return to address mode */
#define PL2303_CONFIGID (1) /* The only supported configuration ID */
#define PL2303_NCONFIGS (1) /* Number of configurations supported */
#define PL2303_INTERFACEID (0)
#define PL2303_ALTINTERFACEID (0)
#define PL2303_NINTERFACES (1) /* Number of interfaces in the configuration */
#define PL2303_NENDPOINTS (3) /* Number of endpoints in the interface */
/* Endpoint configuration */
#define PL2303_EPINTIN_ADDR (USB_DIR_IN|CONFIG_PL2303_EPINTIN)
#define PL2303_EPINTIN_ATTR (USB_EP_ATTR_XFER_INT)
#define PL2303_EPINTIN_MXPACKET (10)
#define PL2303_EPOUTBULK_ADDR (CONFIG_PL2303_EPBULKOUT)
#define PL2303_EPOUTBULK_ATTR (USB_EP_ATTR_XFER_BULK)
#define PL2303_EPINBULK_ADDR (USB_DIR_IN|CONFIG_PL2303_EPBULKIN)
#define PL2303_EPINBULK_ATTR (USB_EP_ATTR_XFER_BULK)
/* String language */
#define PL2303_STR_LANGUAGE (0x0409) /* en-us */
/* Descriptor strings */
#define PL2303_MANUFACTURERSTRID (1)
#define PL2303_PRODUCTSTRID (2)
#define PL2303_SERIALSTRID (3)
#define PL2303_CONFIGSTRID (4)
/* Buffer big enough for any of our descriptors */
#define PL2303_MXDESCLEN (64)
/* Vender specific control requests *******************************************/
#define PL2303_CONTROL_TYPE (0x20)
#define PL2303_SETLINEREQUEST (0x20) /* OUT, Recipient interface */
#define PL2303_GETLINEREQUEST (0x21) /* IN, Recipient interface */
#define PL2303_SETCONTROLREQUEST (0x22) /* OUT, Recipient interface */
#define PL2303_BREAKREQUEST (0x23) /* OUT, Recipient interface */
/* Vendor read/write */
#define PL2303_RWREQUEST_TYPE (0x40)
#define PL2303_RWREQUEST (0x01) /* IN/OUT, Recipient device */
/* Misc Macros ****************************************************************/
/* min/max macros */
#ifndef min
# define min(a,b) ((a)<(b)?(a):(b))
#endif
#ifndef max
# define max(a,b) ((a)>(b)?(a):(b))
#endif
/* Trace values *************************************************************/
#define PL2303_CLASSAPI_SETUP TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_SETUP)
#define PL2303_CLASSAPI_SHUTDOWN TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_SHUTDOWN)
#define PL2303_CLASSAPI_ATTACH TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_ATTACH)
#define PL2303_CLASSAPI_DETACH TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_DETACH)
#define PL2303_CLASSAPI_IOCTL TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_IOCTL)
#define PL2303_CLASSAPI_RECEIVE TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_RECEIVE)
#define PL2303_CLASSAPI_RXINT TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_RXINT)
#define PL2303_CLASSAPI_RXAVAILABLE TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_RXAVAILABLE)
#define PL2303_CLASSAPI_SEND TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_SEND)
#define PL2303_CLASSAPI_TXINT TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_TXINT)
#define PL2303_CLASSAPI_TXREADY TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_TXREADY)
#define PL2303_CLASSAPI_TXEMPTY TRACE_EVENT(TRACE_CLASSAPI_ID, USBSER_TRACECLASSAPI_TXEMPTY)
/****************************************************************************
* Private Types
****************************************************************************/
/* Container to support a list of requests */
struct pl2303_req_s
{
FAR struct pl2303_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 pl2303_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) */
bool rxenabled; /* true: UART RX "interrupts" enabled */
uint8_t linest[7]; /* Fake line status */
int16_t rxhead; /* Working head; used when rx int disabled */
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; /* 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 pl2303_req_s wrreqs[CONFIG_PL2303_NWRREQS];
struct pl2303_req_s rdreqs[CONFIG_PL2303_NWRREQS];
/* Serial I/O buffers */
char rxbuffer[CONFIG_PL2303_RXBUFSIZE];
char txbuffer[CONFIG_PL2303_TXBUFSIZE];
};
/* The internal version of the class driver */
struct pl2303_driver_s
{
struct usbdevclass_driver_s drvr;
FAR struct pl2303_dev_s *dev;
};
/* This is what is allocated */
struct pl2303_alloc_s
{
struct pl2303_dev_s dev;
struct pl2303_driver_s drvr;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Transfer helpers *********************************************************/
static uint16_t usbclass_fillrequest(FAR struct pl2303_dev_s *priv,
uint8_t *reqbuf, uint16_t reqlen);
static int usbclass_sndpacket(FAR struct pl2303_dev_s *priv);
static inline int usbclass_recvpacket(FAR struct pl2303_dev_s *priv,
uint8_t *reqbuf, uint16_t reqlen);
/* Request helpers *********************************************************/
static struct usbdev_req_s *usbclass_allocreq(FAR struct usbdev_ep_s *ep,
uint16_t len);
static void usbclass_freereq(FAR struct usbdev_ep_s *ep,
FAR struct usbdev_req_s *req);
/* Configuration ***********************************************************/
static int usbclass_mkstrdesc(uint8_t id, struct usb_strdesc_s *strdesc);
#ifdef CONFIG_USBDEV_DUALSPEED
static void usbclass_mkepbulkdesc(const struct usb_epdesc_s *indesc,
uint16_t mxpacket, struct usb_epdesc_s *outdesc);
static int16_t usbclass_mkcfgdesc(uint8_t *buf, uint8_t speed, uint8_t type);
#else
static int16_t usbclass_mkcfgdesc(uint8_t *buf);
#endif
static void usbclass_resetconfig(FAR struct pl2303_dev_s *priv);
static int usbclass_setconfig(FAR struct pl2303_dev_s *priv,
uint8_t config);
/* Completion event handlers ***********************************************/
static void usbclass_ep0incomplete(FAR struct usbdev_ep_s *ep,
FAR struct usbdev_req_s *req);
static void usbclass_rdcomplete(FAR struct usbdev_ep_s *ep,
FAR struct usbdev_req_s *req);
static void usbclass_wrcomplete(FAR struct usbdev_ep_s *ep,
FAR struct usbdev_req_s *req);
/* USB class device ********************************************************/
static int usbclass_bind(FAR struct usbdevclass_driver_s *driver,
FAR struct usbdev_s *dev);
static void usbclass_unbind(FAR struct usbdevclass_driver_s *driver,
FAR struct usbdev_s *dev);
static int usbclass_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 usbclass_disconnect(FAR struct usbdevclass_driver_s *driver,
FAR struct usbdev_s *dev);
/* Serial port *************************************************************/
static int usbser_setup(FAR struct uart_dev_s *dev);
static void usbser_shutdown(FAR struct uart_dev_s *dev);
static int usbser_attach(FAR struct uart_dev_s *dev);
static void usbser_detach(FAR struct uart_dev_s *dev);
static void usbser_rxint(FAR struct uart_dev_s *dev, bool enable);
static void usbser_txint(FAR struct uart_dev_s *dev, bool enable);
static bool usbser_txempty(FAR struct uart_dev_s *dev);
/****************************************************************************
* Private Variables
****************************************************************************/
/* USB class device ********************************************************/
static const struct usbdevclass_driverops_s g_driverops =
{
usbclass_bind, /* bind */
usbclass_unbind, /* unbind */
usbclass_setup, /* setup */
usbclass_disconnect, /* disconnect */
NULL, /* suspend */
NULL, /* resume */
};
/* Serial port *************************************************************/
static const struct uart_ops_s g_uartops =
{
usbser_setup, /* setup */
usbser_shutdown, /* shutdown */
usbser_attach, /* attach */
usbser_detach, /* detach */
NULL, /* ioctl */
NULL, /* receive */
usbser_rxint, /* rxinit */
NULL, /* rxavailable */
NULL, /* send */
usbser_txint, /* txinit */
NULL, /* txready */
usbser_txempty /* txempty */
};
/* USB descriptor templates these will be copied and modified **************/
static const struct usb_devdesc_s g_devdesc =
{
USB_SIZEOF_DEVDESC, /* len */
USB_DESC_TYPE_DEVICE, /* type */
{LSBYTE(0x0200), MSBYTE(0x0200)}, /* usb */
USB_CLASS_PER_INTERFACE, /* classid */
0, /* subclass */
0, /* protocol */
CONFIG_PL2303_EP0MAXPACKET, /* maxpacketsize */
{ LSBYTE(CONFIG_PL2303_VENDORID), /* vendor */
MSBYTE(CONFIG_PL2303_VENDORID) },
{ LSBYTE(CONFIG_PL2303_PRODUCTID), /* product */
MSBYTE(CONFIG_PL2303_PRODUCTID) },
{ LSBYTE(PL2303_VERSIONNO), /* device */
MSBYTE(PL2303_VERSIONNO) },
PL2303_MANUFACTURERSTRID, /* imfgr */
PL2303_PRODUCTSTRID, /* iproduct */
PL2303_SERIALSTRID, /* serno */
PL2303_NCONFIGS /* nconfigs */
};
static const struct usb_cfgdesc_s g_cfgdesc =
{
USB_SIZEOF_CFGDESC, /* len */
USB_DESC_TYPE_CONFIG, /* type */
{0, 0}, /* totallen -- to be provided */
PL2303_NINTERFACES, /* ninterfaces */
PL2303_CONFIGID, /* cfgvalue */
PL2303_CONFIGSTRID, /* icfg */
USB_CONFIG_ATTR_ONE|SELFPOWERED|REMOTEWAKEUP, /* attr */
(CONFIG_USBDEV_MAXPOWER + 1) / 2 /* mxpower */
};
static const struct usb_ifdesc_s g_ifdesc =
{
USB_SIZEOF_IFDESC, /* len */
USB_DESC_TYPE_INTERFACE, /* type */
0, /* ifno */
0, /* alt */
PL2303_NENDPOINTS, /* neps */
USB_CLASS_VENDOR_SPEC, /* classid */
0, /* subclass */
0, /* protocol */
PL2303_CONFIGSTRID /* iif */
};
static const struct usb_epdesc_s g_epintindesc =
{
USB_SIZEOF_EPDESC, /* len */
USB_DESC_TYPE_ENDPOINT, /* type */
PL2303_EPINTIN_ADDR, /* addr */
PL2303_EPINTIN_ATTR, /* attr */
{ LSBYTE(PL2303_EPINTIN_MXPACKET), /* maxpacket */
MSBYTE(PL2303_EPINTIN_MXPACKET) },
1 /* interval */
};
static const struct usb_epdesc_s g_epbulkoutdesc =
{
USB_SIZEOF_EPDESC, /* len */
USB_DESC_TYPE_ENDPOINT, /* type */
PL2303_EPOUTBULK_ADDR, /* addr */
PL2303_EPOUTBULK_ATTR, /* attr */
{ LSBYTE(64), MSBYTE(64) }, /* maxpacket -- might change to 512*/
0 /* interval */
};
static const struct usb_epdesc_s g_epbulkindesc =
{
USB_SIZEOF_EPDESC, /* len */
USB_DESC_TYPE_ENDPOINT, /* type */
PL2303_EPINBULK_ADDR, /* addr */
PL2303_EPINBULK_ATTR, /* attr */
{ LSBYTE(64), MSBYTE(64) }, /* maxpacket -- might change to 512*/
0 /* interval */
};
#ifdef CONFIG_USBDEV_DUALSPEED
static const struct usb_qualdesc_s g_qualdesc =
{
USB_SIZEOF_QUALDESC, /* len */
USB_DESC_TYPE_DEVICEQUALIFIER, /* type */
{LSBYTE(0x0200), MSBYTE(0x0200) }, /* USB */
USB_CLASS_VENDOR_SPEC, /* classid */
0, /* subclass */
0, /* protocol */
CONFIG_PL2303_EP0MAXPACKET, /* mxpacketsize */
PL2303_NCONFIGS, /* nconfigs */
0, /* reserved */
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/************************************************************************************
* Name: usbclass_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 usbclass_fillrequest(FAR struct pl2303_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: usbclass_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 not further data
* to send.
*
************************************************************************************/
static int usbclass_sndpacket(FAR struct pl2303_dev_s *priv)
{
FAR struct usbdev_ep_s *ep;
FAR struct usbdev_req_s *req;
FAR struct pl2303_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) usbclass_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_PL2303_BULKREQLEN
reqlen = MAX(CONFIG_PL2303_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 pl2303_req_s *)sq_peek(&priv->reqlist);
req = reqcontainer->req;
/* Fill the request with serial TX data */
len = usbclass_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: usbclass_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 usbclass_recvpacket(FAR struct pl2303_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;
/* 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: usbclass_allocreq
*
* Description:
* Allocate a request instance along with its buffer
*
****************************************************************************/
static struct usbdev_req_s *usbclass_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: usbclass_freereq
*
* Description:
* Free a request instance along with its buffer
*
****************************************************************************/
static void usbclass_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: usbclass_mkstrdesc
*
* Description:
* Construct a string descriptor
*
****************************************************************************/
static int usbclass_mkstrdesc(uint8_t id, struct usb_strdesc_s *strdesc)
{
const char *str;
int len;
int ndata;
int i;
switch (id)
{
case 0:
{
/* Descriptor 0 is the language id */
strdesc->len = 4;
strdesc->type = USB_DESC_TYPE_STRING;
strdesc->data[0] = LSBYTE(PL2303_STR_LANGUAGE);
strdesc->data[1] = MSBYTE(PL2303_STR_LANGUAGE);
return 4;
}
case PL2303_MANUFACTURERSTRID:
str = CONFIG_PL2303_VENDORSTR;
break;
case PL2303_PRODUCTSTRID:
str = CONFIG_PL2303_PRODUCTSTR;
break;
case PL2303_SERIALSTRID:
str = CONFIG_PL2303_SERIALSTR;
break;
case PL2303_CONFIGSTRID:
str = CONFIG_PL2303_CONFIGSTR;
break;
default:
return -EINVAL;
}
/* The string is utf16-le. The poor man's utf-8 to utf16-le
* conversion below will only handle 7-bit en-us ascii
*/
len = strlen(str);
for (i = 0, ndata = 0; i < len; i++, ndata += 2)
{
strdesc->data[ndata] = str[i];
strdesc->data[ndata+1] = 0;
}
strdesc->len = ndata+2;
strdesc->type = USB_DESC_TYPE_STRING;
return strdesc->len;
}
/****************************************************************************
* Name: usbclass_mkepbulkdesc
*
* Description:
* Construct the endpoint descriptor
*
****************************************************************************/
#ifdef CONFIG_USBDEV_DUALSPEED
static inline void usbclass_mkepbulkdesc(const FAR struct usb_epdesc_s *indesc,
uint16_t mxpacket,
FAR struct usb_epdesc_s *outdesc)
{
/* Copy the canned descriptor */
memcpy(outdesc, indesc, USB_SIZEOF_EPDESC);
/* Then add the correct max packet size */
outdesc->mxpacketsize[0] = LSBYTE(mxpacket);
outdesc->mxpacketsize[1] = MSBYTE(mxpacket);
}
#endif
/****************************************************************************
* Name: usbclass_mkcfgdesc
*
* Description:
* Construct the configuration descriptor
*
****************************************************************************/
#ifdef CONFIG_USBDEV_DUALSPEED
static int16_t usbclass_mkcfgdesc(uint8_t *buf, uint8_t speed, uint8_t type)
#else
static int16_t usbclass_mkcfgdesc(uint8_t *buf)
#endif
{
FAR struct usb_cfgdesc_s *cfgdesc = (struct usb_cfgdesc_s*)buf;
#ifdef CONFIG_USBDEV_DUALSPEED
bool hispeed = (speed == USB_SPEED_HIGH);
uint16_t bulkmxpacket;
#endif
uint16_t totallen;
/* This is the total length of the configuration (not necessarily the
* size that we will be sending now.
*/
totallen = USB_SIZEOF_CFGDESC + USB_SIZEOF_IFDESC + PL2303_NENDPOINTS * USB_SIZEOF_EPDESC;
/* Configuration descriptor -- Copy the canned descriptor and fill in the
* type (we'll also need to update the size below
*/
memcpy(cfgdesc, &g_cfgdesc, USB_SIZEOF_CFGDESC);
buf += USB_SIZEOF_CFGDESC;
/* Copy the canned interface descriptor */
memcpy(buf, &g_ifdesc, USB_SIZEOF_IFDESC);
buf += USB_SIZEOF_IFDESC;
/* Make the three endpoint configurations. First, check for switches
* between high and full speed
*/
#ifdef CONFIG_USBDEV_DUALSPEED
if (type == USB_DESC_TYPE_OTHERSPEEDCONFIG)
{
hispeed = !hispeed;
}
#endif
memcpy(buf, &g_epintindesc, USB_SIZEOF_EPDESC);
buf += USB_SIZEOF_EPDESC;
#ifdef CONFIG_USBDEV_DUALSPEED
if (hispeed)
{
bulkmxpacket = 512;
}
else
{
bulkmxpacket = 64;
}
usbclass_mkepbulkdesc(&g_epbulkoutdesc, bulkmxpacket, (struct usb_epdesc_s*)buf);
buf += USB_SIZEOF_EPDESC;
usbclass_mkepbulkdesc(&g_epbulkindesc, bulkmxpacket, (struct usb_epdesc_s*)buf);
#else
memcpy(buf, &g_epbulkoutdesc, USB_SIZEOF_EPDESC);
buf += USB_SIZEOF_EPDESC;
memcpy(buf, &g_epbulkindesc, USB_SIZEOF_EPDESC);
#endif
/* Finally, fill in the total size of the configuration descriptor */
cfgdesc->totallen[0] = LSBYTE(totallen);
cfgdesc->totallen[1] = MSBYTE(totallen);
return totallen;
}
/****************************************************************************
* Name: usbclass_resetconfig
*
* Description:
* Mark the device as not configured and disable all endpoints.
*
****************************************************************************/
static void usbclass_resetconfig(FAR struct pl2303_dev_s *priv)
{
/* Are we configured? */
if (priv->config != PL2303_CONFIGIDNONE)
{
/* Yes.. but not anymore */
priv->config = PL2303_CONFIGIDNONE;
/* Disable endpoints. This should force completion of all pending
* transfers.
*/
EP_DISABLE(priv->epintin);
EP_DISABLE(priv->epbulkin);
EP_DISABLE(priv->epbulkout);
}
}
/****************************************************************************
* Name: usbclass_setconfig
*
* Description:
* Set the device configuration by allocating and configuring endpoints and
* by allocating and queue read and write requests.
*
****************************************************************************/
static int usbclass_setconfig(FAR struct pl2303_dev_s *priv, uint8_t config)
{
FAR struct usbdev_req_s *req;
#ifdef CONFIG_USBDEV_DUALSPEED
struct usb_epdesc_s epdesc;
uint16_t bulkmxpacket;
#endif
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 */
usbclass_resetconfig(priv);
/* Was this a request to simply discard the current configuration? */
if (config == PL2303_CONFIGIDNONE)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_CONFIGNONE), 0);
return 0;
}
/* We only accept one configuration */
if (config != PL2303_CONFIGID)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_CONFIGIDBAD), 0);
return -EINVAL;
}
/* Configure the IN interrupt endpoint */
ret = EP_CONFIGURE(priv->epintin, &g_epintindesc, 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)
{
bulkmxpacket = 512;
}
else
{
bulkmxpacket = 64;
}
usbclass_mkepbulkdesc(&g_epbulkindesc, bulkmxpacket, &epdesc);
ret = EP_CONFIGURE(priv->epbulkin, &epdesc, false);
#else
ret = EP_CONFIGURE(priv->epbulkin, &g_epbulkindesc, false);
#endif
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
usbclass_mkepbulkdesc(&g_epbulkoutdesc, bulkmxpacket, &epdesc);
ret = EP_CONFIGURE(priv->epbulkout, &epdesc, true);
#else
ret = EP_CONFIGURE(priv->epbulkout, &g_epbulkoutdesc, true);
#endif
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_PL2303_NRDREQS; i++)
{
req = priv->rdreqs[i].req;
req->callback = usbclass_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:
usbclass_resetconfig(priv);
return ret;
}
/****************************************************************************
* Name: usbclass_ep0incomplete
*
* Description:
* Handle completion of EP0 control operations
*
****************************************************************************/
static void usbclass_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: usbclass_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 usbclass_rdcomplete(FAR struct usbdev_ep_s *ep,
FAR struct usbdev_req_s *req)
{
FAR struct pl2303_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 pl2303_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);
usbclass_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_PL2303_BULKREQLEN
req->len = max(CONFIG_PL2303_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: usbclass_wrcomplete
*
* Description:
* Handle completion of write request. This function probably executes
* in the context of an interrupt handler.
*
****************************************************************************/
static void usbclass_wrcomplete(FAR struct usbdev_ep_s *ep,
FAR struct usbdev_req_s *req)
{
FAR struct pl2303_dev_s *priv;
FAR struct pl2303_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 pl2303_dev_s *)ep->priv;
reqcontainer = (FAR struct pl2303_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);
usbclass_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: usbclass_bind
*
* Description:
* Invoked when the driver is bound to a USB device driver
*
****************************************************************************/
static int usbclass_bind(FAR struct usbdevclass_driver_s *driver,
FAR struct usbdev_s *dev)
{
FAR struct pl2303_dev_s *priv = ((FAR struct pl2303_driver_s*)driver)->dev;
FAR struct pl2303_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).
*/
dev->ep0->priv = priv;
/* Preallocate control request */
priv->ctrlreq = usbclass_allocreq(dev->ep0, PL2303_MXDESCLEN);
if (priv->ctrlreq == NULL)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_ALLOCCTRLREQ), 0);
ret = -ENOMEM;
goto errout;
}
priv->ctrlreq->callback = usbclass_ep0incomplete;
/* Pre-allocate all endpoints... the endpoints will not be functional
* until the SET CONFIGURATION request is processed in usbclass_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, PL2303_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, PL2303_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, PL2303_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_PL2303_BULKREQLEN
reqlen = max(CONFIG_PL2303_BULKREQLEN, priv->epbulkout->maxpacket);
#else
reqlen = priv->epbulkout->maxpacket;
#endif
for (i = 0; i < CONFIG_PL2303_NRDREQS; i++)
{
reqcontainer = &priv->rdreqs[i];
reqcontainer->req = usbclass_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 = usbclass_rdcomplete;
}
/* Pre-allocate write request containers and put in a free list */
#ifdef CONFIG_PL2303_BULKREQLEN
reqlen = max(CONFIG_PL2303_BULKREQLEN, priv->epbulkin->maxpacket);
#else
reqlen = priv->epbulkin->maxpacket;
#endif
for (i = 0; i < CONFIG_PL2303_NWRREQS; i++)
{
reqcontainer = &priv->wrreqs[i];
reqcontainer->req = usbclass_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 = usbclass_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 */
#ifdef CONFIG_USBDEV_SELFPOWERED
DEV_SETSELFPOWERED(dev);
#endif
/* And pull-up the data line for the soft connect function */
DEV_CONNECT(dev);
return OK;
errout:
usbclass_unbind(driver, dev);
return ret;
}
/****************************************************************************
* Name: usbclass_unbind
*
* Description:
* Invoked when the driver is unbound from a USB device driver
*
****************************************************************************/
static void usbclass_unbind(FAR struct usbdevclass_driver_s *driver,
FAR struct usbdev_s *dev)
{
FAR struct pl2303_dev_s *priv;
FAR struct pl2303_req_s *reqcontainer;
irqstate_t flags;
int i;
usbtrace(TRACE_CLASSUNBIND, 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 pl2303_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 usbclass_resetconfig
* should cause the endpoints to immediately terminate all
* transfers and return the requests to us (with result == -ESHUTDOWN)
*/
usbclass_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)
{
usbclass_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_PL2303_NRDREQS; i++)
{
reqcontainer = &priv->rdreqs[i];
if (reqcontainer->req)
{
usbclass_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_PL2303_NWRREQS);
while (!sq_empty(&priv->reqlist))
{
reqcontainer = (struct pl2303_req_s *)sq_remfirst(&priv->reqlist);
if (reqcontainer->req != NULL)
{
usbclass_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: usbclass_setup
*
* Description:
* Invoked for ep0 control requests. This function probably executes
* in the context of an interrupt handler.
*
****************************************************************************/
static int usbclass_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 pl2303_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 || !dev->ep0 || !ctrl)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0);
return -EIO;
}
#endif
/* Extract reference to private data */
usbtrace(TRACE_CLASSSETUP, ctrl->req);
priv = ((FAR struct pl2303_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);
switch (ctrl->type & USB_REQ_TYPE_MASK)
{
/***********************************************************************
* Standard Requests
***********************************************************************/
case USB_REQ_TYPE_STANDARD:
{
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])
{
case USB_DESC_TYPE_DEVICE:
{
ret = USB_SIZEOF_DEVDESC;
memcpy(ctrlreq->buf, &g_devdesc, ret);
}
break;
#ifdef CONFIG_USBDEV_DUALSPEED
case USB_DESC_TYPE_DEVICEQUALIFIER:
{
ret = USB_SIZEOF_QUALDESC;
memcpy(ctrlreq->buf, &g_qualdesc, ret);
}
break;
case USB_DESC_TYPE_OTHERSPEEDCONFIG:
#endif /* CONFIG_USBDEV_DUALSPEED */
case USB_DESC_TYPE_CONFIG:
{
#ifdef CONFIG_USBDEV_DUALSPEED
ret = usbclass_mkcfgdesc(ctrlreq->buf, dev->speed, ctrl->req);
#else
ret = usbclass_mkcfgdesc(ctrlreq->buf);
#endif
}
break;
case USB_DESC_TYPE_STRING:
{
/* index == language code. */
ret = usbclass_mkstrdesc(ctrl->value[0], (struct usb_strdesc_s *)ctrlreq->buf);
}
break;
default:
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_GETUNKNOWNDESC), value);
}
break;
}
}
break;
case USB_REQ_SETCONFIGURATION:
{
if (ctrl->type == 0)
{
ret = usbclass_setconfig(priv, value);
}
}
break;
case USB_REQ_GETCONFIGURATION:
{
if (ctrl->type == USB_DIR_IN)
{
*(uint8_t*)ctrlreq->buf = priv->config;
ret = 1;
}
}
break;
case USB_REQ_SETINTERFACE:
{
if (ctrl->type == USB_REQ_RECIPIENT_INTERFACE)
{
if (priv->config == PL2303_CONFIGID &&
index == PL2303_INTERFACEID &&
value == PL2303_ALTINTERFACEID)
{
usbclass_resetconfig(priv);
usbclass_setconfig(priv, priv->config);
ret = 0;
}
}
}
break;
case USB_REQ_GETINTERFACE:
{
if (ctrl->type == (USB_DIR_IN|USB_REQ_RECIPIENT_INTERFACE) &&
priv->config == PL2303_CONFIGIDNONE)
{
if (index != PL2303_INTERFACEID)
{
ret = -EDOM;
}
else
{
*(uint8_t*) ctrlreq->buf = PL2303_ALTINTERFACEID;
ret = 1;
}
}
}
break;
default:
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDSTDREQ), ctrl->req);
break;
}
}
break;
/***********************************************************************
* PL2303 Vendor-Specific Requests
***********************************************************************/
case PL2303_CONTROL_TYPE:
{
if ((ctrl->type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_INTERFACE)
{
switch (ctrl->req)
{
case PL2303_SETLINEREQUEST:
{
memcpy(priv->linest, ctrlreq->buf, min(len, 7));
ret = 0;
}
break;
case PL2303_GETLINEREQUEST:
{
memcpy(ctrlreq->buf, priv->linest, 7);
ret = 7;
}
break;
case PL2303_SETCONTROLREQUEST:
case PL2303_BREAKREQUEST:
{
ret = 0;
}
break;
default:
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDCLASSREQ), ctrl->type);
break;
}
}
}
break;
case PL2303_RWREQUEST_TYPE:
{
if ((ctrl->type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE)
{
if (ctrl->req == PL2303_RWREQUEST)
{
if ((ctrl->type & USB_DIR_IN) != 0)
{
*(uint32_t*)ctrlreq->buf = 0xdeadbeef;
ret = 4;
}
else
{
ret = 0;
}
}
else
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDCLASSREQ), ctrl->type);
}
}
}
break;
default:
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UNSUPPORTEDTYPE), ctrl->type);
break;
}
/* Respond to the setup command if data was returned. On an error return
* value (ret < 0), the USB driver will stall.
*/
if (ret >= 0)
{
ctrlreq->len = min(len, ret);
ctrlreq->flags = USBDEV_REQFLAGS_NULLPKT;
ret = EP_SUBMIT(dev->ep0, ctrlreq);
if (ret < 0)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EPRESPQ), (uint16_t)-ret);
ctrlreq->result = OK;
usbclass_ep0incomplete(dev->ep0, ctrlreq);
}
}
return ret;
}
/****************************************************************************
* Name: usbclass_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 usbclass_disconnect(FAR struct usbdevclass_driver_s *driver,
FAR struct usbdev_s *dev)
{
FAR struct pl2303_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 pl2303_driver_s*)driver)->dev;
#ifdef CONFIG_DEBUG
if (!priv)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_EP0NOTBOUND), 0);
return;
}
#endif
/* Reset the configuration */
flags = irqsave();
usbclass_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.
*/
DEV_CONNECT(dev);
}
/****************************************************************************
* Serial Device Methods
****************************************************************************/
/****************************************************************************
* Name: usbser_setup
*
* Description:
* This method is called the first time that the serial port is opened.
*
****************************************************************************/
static int usbser_setup(FAR struct uart_dev_s *dev)
{
FAR struct pl2303_dev_s *priv;
usbtrace(PL2303_CLASSASPI_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 pl2303_dev_s*)dev->priv;
/* Check if we have been configured */
if (priv->config == PL2303_CONFIGIDNONE)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_SETUPNOTCONNECTED), 0);
return -ENOTCONN;
}
return OK;
}
/****************************************************************************
* Name: usbser_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
* usbser_txempty() until that function returns true before calling this
* function.
*
****************************************************************************/
static void usbser_shutdown(FAR struct uart_dev_s *dev)
{
usbtrace(PL2303_CLASSASPI_SHUTDOWN, 0);
/* Sanity check */
#if CONFIG_DEBUG
if (!dev || !dev->priv)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_INVALIDARG), 0);
}
#endif
}
/****************************************************************************
* Name: usbser_attach
*
* Description:
* Does not apply to the USB serial class device
*
****************************************************************************/
static int usbser_attach(FAR struct uart_dev_s *dev)
{
usbtrace(PL2303_CLASSASPI_ATTACH, 0);
return OK;
}
/****************************************************************************
* Name: usbser_detach
*
* Description:
* Does not apply to the USB serial class device
*
****************************************************************************/
static void usbser_detach(FAR struct uart_dev_s *dev)
{
usbtrace(PL2303_CLASSASPI_DETACH, 0);
}
/****************************************************************************
* Name: usbser_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 usbser_setup
* and usbser_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 usbser_detach
* and usbser_shutdown are called).
*
****************************************************************************/
static void usbser_rxint(FAR struct uart_dev_s *dev, bool enable)
{
FAR struct pl2303_dev_s *priv;
FAR uart_dev_t *serdev;
irqstate_t flags;
usbtrace(PL2303_CLASSASPI_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 pl2303_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: usbser_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 usbser_txint(FAR struct uart_dev_s *dev, bool enable)
{
FAR struct pl2303_dev_s *priv;
usbtrace(PL2303_CLASSASPI_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 pl2303_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)
{
usbclass_sndpacket(priv);
}
}
/****************************************************************************
* Name: usbser_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 usbser_txempty(FAR struct uart_dev_s *dev)
{
FAR struct pl2303_dev_s *priv = (FAR struct pl2303_dev_s*)dev->priv;
usbtrace(PL2303_CLASSASPI_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_PL2303_NWRREQS;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usbdev_serialinitialize
*
* Description:
* Register USB serial port (and USB serial console if so configured).
*
****************************************************************************/
int usbdev_serialinitialize(int minor)
{
FAR struct pl2303_alloc_s *alloc;
FAR struct pl2303_dev_s *priv;
FAR struct pl2303_driver_s *drvr;
char devname[16];
int ret;
/* Allocate the structures needed */
alloc = (FAR struct pl2303_alloc_s*)kmalloc(sizeof(struct pl2303_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 pl2303_dev_s));
sq_init(&priv->reqlist);
/* Fake line status */
priv->linest[0] = (115200) & 0xff; /* Baud=115200 */
priv->linest[1] = (115200 >> 8) & 0xff;
priv->linest[2] = (115200 >> 16) & 0xff;
priv->linest[3] = (115200 >> 24) & 0xff;
priv->linest[4] = 0; /* One stop bit */
priv->linest[5] = 0; /* No parity */
priv->linest[6] = 8; /*8 data bits */
/* Initialize the serial driver sub-structure */
priv->serdev.recv.size = CONFIG_PL2303_RXBUFSIZE;
priv->serdev.recv.buffer = priv->rxbuffer;
priv->serdev.xmit.size = CONFIG_PL2303_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 class driver */
ret = usbdev_register(&drvr->drvr);
if (ret)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_DEVREGISTER), (uint16_t)-ret);
goto errout_with_alloc;
}
/* Register the USB serial console */
#ifdef CONFIG_PL2303_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 single port supported by this implementation */
sprintf(devname, "/dev/ttyUSB%d", minor);
ret = uart_register(devname, &priv->serdev);
if (ret)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_UARTREGISTER), (uint16_t)-ret);
goto errout_with_class;
}
return OK;
errout_with_class:
usbdev_unregister(&drvr->drvr);
errout_with_alloc:
kfree(alloc);
return ret;
}
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