/****************************************************************************
* drivers/usbhost/usbhost_hidkbd.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <poll.h>
#include <semaphore.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/fs.h>
#include <nuttx/arch.h>
#include <nuttx/wqueue.h>
#include <nuttx/usb/usb.h>
#include <nuttx/usb/usbhost.h>
#include <nuttx/usb/hid.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Worker thread support is required */
#ifndef CONFIG_SCHED_WORKQUEUE
# error "Worker thread support is required (CONFIG_SCHED_WORKQUEUE)"
#endif
/* This determines how often the USB keyboard will be polled in units of
* of clock ticks. The default is 100MS.
*/
#ifndef CONFIG_HIDKBD_POLLTICKS
/* The value CLK_TCK gives the frequency in HZ of the system timer. This
* is, the number of ticks in one second. So one tenth of this would give
* is the number of ticks required for a 100MS delay between polls.
*/
# define CONFIG_HIDKBD_POLLTICKS (CLK_TCK/10)
#endif
/* Driver support ***********************************************************/
/* This format is used to construct the /dev/sd[n] device driver path. It
* defined here so that it will be used consistently in all places.
*/
#define DEV_FORMAT "/dev/sd%c"
#define DEV_NAMELEN 10
/* Used in usbhost_cfgdesc() */
#define USBHOST_IFFOUND 0x01 /* Required I/F descriptor found */
#define USBHOST_EPINFOUND 0x02 /* Required interrupt IN EP descriptor found */
#define USBHOST_EPOUTFOUND 0x04 /* Optional interrupt OUT EP descriptor found */
#define USBHOST_RQDFOUND (USBHOST_IFFOUND|USBHOST_EPINFOUND)
#define USBHOST_MAX_CREFS 0x7fff
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure contains the internal, private state of the USB host mass
* storage class.
*/
struct usbhost_state_s
{
/* This is the externally visible portion of the state */
struct usbhost_class_s class;
/* This is an instance of the USB host driver bound to this class instance */
struct usbhost_driver_s *drvr;
/* The remainder of the fields are provide o the mass storage class */
char sdchar; /* Character identifying the /dev/sd[n] device */
volatile bool disconnected; /* TRUE: Device has been disconnected */
int16_t crefs; /* Reference count on the driver instance */
sem_t exclsem; /* Used to maintain mutual exclusive access */
struct work_s work; /* For interacting with the worker thread */
FAR uint8_t *tdbuffer; /* The allocated transfer descriptor buffer */
size_t tdbuflen; /* Size of the allocated transfer buffer */
/* Endpoints:
* EP0 (Control):
* - Receiving and responding to requests for USB control and class data.
* - IN data when polled by the HID class driver (Get_Report)
* - OUT data from the host.
* EP Interrupt IN:
* - Receiving asynchronous (unrequested) IN data from the device.
* EP Interrrupt OUT (optional):
* - Transmitting low latency OUT data to the device.
* - If not present, EP0 used.
*/
usbhost_ep_t epin; /* Interrupt IN endpoint */
usbhost_ep_t epout; /* Optional interrupt OUT endpoint */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Semaphores */
static void usbhost_takesem(sem_t *sem);
#define usbhost_givesem(s) sem_post(s);
/* Memory allocation services */
static inline FAR struct usbhost_state_s *usbhost_allocclass(void);
static inline void usbhost_freeclass(FAR struct usbhost_state_s *class);
/* Device name management */
static int usbhost_allocdevno(FAR struct usbhost_state_s *priv);
static void usbhost_freedevno(FAR struct usbhost_state_s *priv);
static inline void usbhost_mkdevname(FAR struct usbhost_state_s *priv, char *devname);
/* Worker thread actions */
static void usbhost_kbdpoll(FAR void *arg);
static void usbhost_destroy(FAR void *arg);
/* Helpers for usbhost_connect() */
static inline int usbhost_cfgdesc(FAR struct usbhost_state_s *priv,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr);
static inline int usbhost_devinit(FAR struct usbhost_state_s *priv);
/* (Little Endian) Data helpers */
static inline uint16_t usbhost_getle16(const uint8_t *val);
static inline void usbhost_putle16(uint8_t *dest, uint16_t val);
static inline uint32_t usbhost_getle32(const uint8_t *val);
static void usbhost_putle32(uint8_t *dest, uint32_t val);
/* Transfer descriptor memory management */
static inline int usbhost_tdalloc(FAR struct usbhost_state_s *priv);
static inline int usbhost_tdfree(FAR struct usbhost_state_s *priv);
/* struct usbhost_registry_s methods */
static struct usbhost_class_s *usbhost_create(FAR struct usbhost_driver_s *drvr,
FAR const struct usbhost_id_s *id);
/* struct usbhost_class_s methods */
static int usbhost_connect(FAR struct usbhost_class_s *class,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr);
static int usbhost_disconnected(FAR struct usbhost_class_s *class);
/* Driver methods. We export the keyboard as a standard character driver */
static ssize_t usbhost_read(FAR struct file *filp,
FAR char *buffer, size_t len);
static ssize_t usbhost_write(FAR struct file *filp,
FAR const char *buffer, size_t len);
#ifndef CONFIG_DISABLE_POLL
static int usbhost_poll(FAR struct file *filp, FAR struct pollfd *fds,
bool setup);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
/* This structure provides the registry entry ID informatino that will be
* used to associate the USB host mass storage class to a connected USB
* device.
*/
static const const struct usbhost_id_s g_id =
{
USB_CLASS_HID, /* base */
USBHID_SUBCLASS_BOOTIF, /* subclass */
USBHID_PROTOCOL_KEYBOARD, /* proto */
0, /* vid */
0 /* pid */
};
/* This is the USB host storage class's registry entry */
static struct usbhost_registry_s g_skeleton =
{
NULL, /* flink */
usbhost_create, /* create */
1, /* nids */
&g_id /* id[] */
};
static const struct file_operations usbhost_fops =
{
0, /* open */
0, /* close */
usbhost_read, /* read */
usbhost_write, /* write */
0, /* seek */
0 /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, usbhost_poll /* poll */
#endif
};
/* This is a bitmap that is used to allocate device names /dev/sda-z. */
static uint32_t g_devinuse;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_takesem
*
* Description:
* This is just a wrapper to handle the annoying behavior of semaphore
* waits that return due to the receipt of a signal.
*
****************************************************************************/
static void usbhost_takesem(sem_t *sem)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(sem) != 0)
{
/* The only case that an error should occr here is if the wait was
* awakened by a signal.
*/
ASSERT(errno == EINTR);
}
}
/****************************************************************************
* Name: usbhost_allocclass
*
* Description:
* This is really part of the logic that implements the create() method
* of struct usbhost_registry_s. This function allocates memory for one
* new class instance.
*
* Input Parameters:
* None
*
* Returned Values:
* On success, this function will return a non-NULL instance of struct
* usbhost_class_s. NULL is returned on failure; this function will
* will fail only if there are insufficient resources to create another
* USB host class instance.
*
****************************************************************************/
static inline FAR struct usbhost_state_s *usbhost_allocclass(void)
{
FAR struct usbhost_state_s *priv;
DEBUGASSERT(!up_interrupt_context());
priv = (FAR struct usbhost_state_s *)malloc(sizeof(struct usbhost_state_s));
uvdbg("Allocated: %p\n", priv);;
return priv;
}
/****************************************************************************
* Name: usbhost_freeclass
*
* Description:
* Free a class instance previously allocated by usbhost_allocclass().
*
* Input Parameters:
* class - A reference to the class instance to be freed.
*
* Returned Values:
* None
*
****************************************************************************/
static inline void usbhost_freeclass(FAR struct usbhost_state_s *class)
{
DEBUGASSERT(class != NULL);
/* Free the class instance (calling sched_free() in case we are executing
* from an interrupt handler.
*/
uvdbg("Freeing: %p\n", class);;
free(class);
}
/****************************************************************************
* Name: Device name management
*
* Description:
* Some tiny functions to coordinate management of device names.
*
****************************************************************************/
static int usbhost_allocdevno(FAR struct usbhost_state_s *priv)
{
irqstate_t flags;
int devno;
flags = irqsave();
for (devno = 0; devno < 26; devno++)
{
uint32_t bitno = 1 << devno;
if ((g_devinuse & bitno) == 0)
{
g_devinuse |= bitno;
priv->sdchar = 'a' + devno;
irqrestore(flags);
return OK;
}
}
irqrestore(flags);
return -EMFILE;
}
static void usbhost_freedevno(FAR struct usbhost_state_s *priv)
{
int devno = 'a' - priv->sdchar;
if (devno >= 0 && devno < 26)
{
irqstate_t flags = irqsave();
g_devinuse &= ~(1 << devno);
irqrestore(flags);
}
}
static inline void usbhost_mkdevname(FAR struct usbhost_state_s *priv, char *devname)
{
(void)snprintf(devname, DEV_NAMELEN, DEV_FORMAT, priv->sdchar);
}
/****************************************************************************
* Name: usbhost_kbdpoll
*
* Description:
* Periodically check for new keyboard data.
*
* Input Parameters:
* arg - A reference to the class instance to be destroyed.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_kbdpoll(FAR void *arg)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)arg;
irqstate_t flags;
#ifdef CONFIG_DEBUG_USB
static unsigned int npolls = 0;
#endif
int ret;
/* Poll the keyboard */
#warning "Missing logic"
/* Setup for the next poll. We have to be careful here because the work
* structure may be used by the interrupt handler if the USB device is
* disconnected.
*/
flags = irqsave();
/* Is the device still connected? If not, we do not reschedule any further
* polling of the device.
*/
if (priv->disconnected)
{
udbg("Keyboard removed, polling halted\n");
}
else
{
/* Otherwise, just setup the next poll. */
ret = work_queue(&priv->work, usbhost_kbdpoll, priv, CONFIG_HIDKBD_POLLTICKS);
if (ret != 0)
{
udbg("ERROR: Failed to re-schedule keyboard poll: %d\n", ret);
}
/* If USB debug is on, then provide some periodic indication that
* polling is still happening.
*/
#ifdef CONFIG_DEBUG_USB
npolls++;
#endif
}
irqrestore(flags);
/* If USB debug is on, then provide some periodic indication that
* polling is still happening.
*/
#ifdef CONFIG_DEBUG_USB
if (!priv->disconnected && (npolls & ~31) == 0)
{
udbg("Still polling: %d\n", npolls);
}
#endif
}
/****************************************************************************
* Name: usbhost_destroy
*
* Description:
* The USB device has been disconnected and the refernce count on the USB
* host class instance has gone to 1.. Time to destroy the USB host class
* instance.
*
* Input Parameters:
* arg - A reference to the class instance to be destroyed.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_destroy(FAR void *arg)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)arg;
char devname[DEV_NAMELEN];
DEBUGASSERT(priv != NULL);
uvdbg("crefs: %d\n", priv->crefs);
/* Unregister the driver */
uvdbg("Unregister driver\n");
usbhost_mkdevname(priv, devname);
(void)unregister_driver(devname);
/* Release the device name used by this connection */
usbhost_freedevno(priv);
/* Free the interrupt endpoints */
if (priv->epin)
{
DRVR_EPFREE(priv->drvr, priv->epin);
}
if (priv->epout)
{
DRVR_EPFREE(priv->drvr, priv->epout);
}
/* Free any transfer buffers */
usbhost_tdfree(priv);
/* Destroy the semaphores */
sem_destroy(&priv->exclsem);
/* Disconnect the USB host device */
DRVR_DISCONNECT(priv->drvr);
/* And free the class instance. Hmmm.. this may execute on the worker
* thread and the work structure is part of what is getting freed. That
* should be okay because once the work contained is removed from the
* queue, it should not longer be accessed by the worker thread.
*/
usbhost_freeclass(priv);
}
/****************************************************************************
* Name: usbhost_cfgdesc
*
* Description:
* This function implements the connect() method of struct
* usbhost_class_s. This method is a callback into the class
* implementation. It is used to provide the device's configuration
* descriptor to the class so that the class may initialize properly
*
* Input Parameters:
* priv - The USB host class instance.
* configdesc - A pointer to a uint8_t buffer container the configuration descripor.
* desclen - The length in bytes of the configuration descriptor.
* funcaddr - The USB address of the function containing the endpoint that EP0
* controls
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
****************************************************************************/
static inline int usbhost_cfgdesc(FAR struct usbhost_state_s *priv,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr)
{
FAR struct usb_cfgdesc_s *cfgdesc;
FAR struct usb_desc_s *desc;
FAR struct usbhost_epdesc_s epindesc;
FAR struct usbhost_epdesc_s epoutdesc;
int remaining;
uint8_t found = 0;
int ret;
DEBUGASSERT(priv != NULL &&
configdesc != NULL &&
desclen >= sizeof(struct usb_cfgdesc_s));
/* Verify that we were passed a configuration descriptor */
cfgdesc = (FAR struct usb_cfgdesc_s *)configdesc;
if (cfgdesc->type != USB_DESC_TYPE_CONFIG)
{
return -EINVAL;
}
/* Get the total length of the configuration descriptor (little endian).
* It might be a good check to get the number of interfaces here too.
*/
remaining = (int)usbhost_getle16(cfgdesc->totallen);
/* Skip to the next entry descriptor */
configdesc += cfgdesc->len;
remaining -= cfgdesc->len;
/* Loop where there are more dscriptors to examine */
while (remaining >= sizeof(struct usb_desc_s))
{
/* What is the next descriptor? */
desc = (FAR struct usb_desc_s *)configdesc;
switch (desc->type)
{
/* Interface descriptor. We really should get the number of endpoints
* from this descriptor too.
*/
case USB_DESC_TYPE_INTERFACE:
{
uvdbg("Interface descriptor\n");
DEBUGASSERT(remaining >= USB_SIZEOF_IFDESC);
if ((found & USBHOST_IFFOUND) != 0)
{
/* Oops.. more than one interface. We don't know what to do with this. */
return -ENOSYS;
}
found |= USBHOST_IFFOUND;
}
break;
/* HID descriptor */
case USBHID_DESCTYPE_HID:
uvdbg("HID descriptor\n");
break;
/* Endpoint descriptor. We expect one or two interrupt endpoints,
* a required IN endpoint and an optional OUT endpoint.
*/
case USB_DESC_TYPE_ENDPOINT:
{
FAR struct usb_epdesc_s *epdesc = (FAR struct usb_epdesc_s *)configdesc;
uvdbg("Endpoint descriptor\n");
DEBUGASSERT(remaining >= USB_SIZEOF_EPDESC);
/* Check for an interrupt endpoint. */
if ((epdesc->attr & USB_EP_ATTR_XFERTYPE_MASK) == USB_EP_ATTR_XFER_INT)
{
/* Yes.. it is a interrupt endpoint. IN or OUT? */
if (USB_ISEPOUT(epdesc->addr))
{
/* It is an interrupt OUT endpoint. There not be more than one
* interrupt OUT endpoint.
*/
if ((found & USBHOST_EPOUTFOUND) != 0)
{
/* Oops.. more than one endpoint. We don't know what to do with this. */
return -EINVAL;
}
found |= USBHOST_EPOUTFOUND;
/* Save the interrupt OUT endpoint information */
epoutdesc.addr = epdesc->addr & USB_EP_ADDR_NUMBER_MASK;
epoutdesc.in = false;
epoutdesc.funcaddr = funcaddr;
epoutdesc.mxpacketsize = usbhost_getle16(epdesc->mxpacketsize);
uvdbg("Interrupt OUT EP addr:%d mxpacketsize:%d\n",
epoutdesc.addr, epoutdesc.mxpacketsize);
}
else
{
/* It is an interrupt IN endpoint. There should be only
* one interrupt IN endpoint.
*/
if ((found & USBHOST_EPINFOUND) != 0)
{
/* Oops.. more than one endpint. We don't know what
* to do with this.
*/
return -EINVAL;
}
found |= USBHOST_EPINFOUND;
/* Save the interrupt IN endpoint information */
epindesc.addr = epdesc->addr & USB_EP_ADDR_NUMBER_MASK;
epindesc.in = 1;
epindesc.funcaddr = funcaddr;
epindesc.mxpacketsize = usbhost_getle16(epdesc->mxpacketsize);
uvdbg("Interrupt IN EP addr:%d mxpacketsize:%d\n",
epindesc.addr, epindesc.mxpacketsize);
}
}
}
break;
/* Other descriptors are just ignored for now */
default:
uvdbg("Other descriptor: %d\n", desc->type);
break;
}
/* Increment the address of the next descriptor */
configdesc += desc->len;
remaining -= desc->len;
}
/* Sanity checking... did we find all of things that we need? */
if ((found & USBHOST_RQDFOUND) != USBHOST_RQDFOUND)
{
ulldbg("ERROR: Found IF:%s EPIN:%s\n",
(found & USBHOST_IFFOUND) != 0 ? "YES" : "NO",
(found & USBHOST_EPINFOUND) != 0 ? "YES" : "NO");
return -EINVAL;
}
/* We are good... Allocate the endpoints. First, the required interrupt
* IN endpoint.
*/
ret = DRVR_EPALLOC(priv->drvr, &epindesc, &priv->epin);
if (ret != OK)
{
udbg("ERROR: Failed to allocate interrupt IN endpoint\n");
return ret;
}
/* Then the optional interrupt OUT endpoint */
ullvdbg("Found EPOOUT:%s\n",
(found & USBHOST_EPOUTFOUND) != 0 ? "YES" : "NO");
if ((found & USBHOST_EPOUTFOUND) != 0)
{
ret = DRVR_EPALLOC(priv->drvr, &epoutdesc, &priv->epout);
if (ret != OK)
{
udbg("ERROR: Failed to allocate interrupt OUT endpoint\n");
(void)DRVR_EPFREE(priv->drvr, priv->epin);
return ret;
}
}
ullvdbg("Endpoints allocated\n");
return OK;
}
/****************************************************************************
* Name: usbhost_devinit
*
* Description:
* The USB device has been successfully connected. This completes the
* initialization operations. It is first called after the
* configuration descriptor has been received.
*
* This function is called from the connect() method. This function always
* executes on the thread of the caller of connect().
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* None
*
****************************************************************************/
static inline int usbhost_devinit(FAR struct usbhost_state_s *priv)
{
int ret;
/* Set aside a transfer buffer for exclusive use by the keyboard class driver */
ret = usbhost_tdalloc(priv);
if (ret != OK)
{
udbg("ERROR: Failed to allocate transfer buffer\n");
return ret;
}
/* Increment the reference count. This will prevent usbhost_destroy() from
* being called asynchronously if the device is removed.
*/
priv->crefs++;
DEBUGASSERT(priv->crefs == 2);
/* Setup a period worker thread event to poll the USB device. */
ret = work_queue(&priv->work, usbhost_kbdpoll, priv, CONFIG_HIDKBD_POLLTICKS);
/* Register the driver */
if (ret == OK)
{
char devname[DEV_NAMELEN];
uvdbg("Register driver\n");
usbhost_mkdevname(priv, devname);
(void)register_driver(devname, &usbhost_fops, 0666, NULL);
}
/* Check if we successfully initialized. We now have to be concerned
* about asynchronous modification of crefs because the driver has
* been registerd.
*/
if (ret == OK)
{
usbhost_takesem(&priv->exclsem);
DEBUGASSERT(priv->crefs >= 2);
/* Handle a corner case where (1) open() has been called so the
* reference count is > 2, but the device has been disconnected.
* In this case, the class instance needs to persist until close()
* is called.
*/
if (priv->crefs <= 2 && priv->disconnected)
{
/* We don't have to give the semaphore because it will be
* destroyed when usb_destroy is called.
*/
ret = -ENODEV;
}
else
{
/* Ready for normal operation as a character device driver */
uvdbg("Successfully initialized\n");
priv->crefs--;
usbhost_givesem(&priv->exclsem);
}
}
/* Disconnect on any errors detected during volume initialization */
if (ret != OK)
{
udbg("ERROR! Aborting: %d\n", ret);
usbhost_destroy(priv);
}
return ret;
}
/****************************************************************************
* Name: usbhost_getle16
*
* Description:
* Get a (possibly unaligned) 16-bit little endian value.
*
* Input Parameters:
* val - A pointer to the first byte of the little endian value.
*
* Returned Values:
* A uint16_t representing the whole 16-bit integer value
*
****************************************************************************/
static inline uint16_t usbhost_getle16(const uint8_t *val)
{
return (uint16_t)val[1] << 8 | (uint16_t)val[0];
}
/****************************************************************************
* Name: usbhost_putle16
*
* Description:
* Put a (possibly unaligned) 16-bit little endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the little endian value.
* val - The 16-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_putle16(uint8_t *dest, uint16_t val)
{
dest[0] = val & 0xff; /* Little endian means LS byte first in byte stream */
dest[1] = val >> 8;
}
/****************************************************************************
* Name: usbhost_getle32
*
* Description:
* Get a (possibly unaligned) 32-bit little endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the big endian value.
* val - The 32-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static inline uint32_t usbhost_getle32(const uint8_t *val)
{
/* Little endian means LS halfword first in byte stream */
return (uint32_t)usbhost_getle16(&val[2]) << 16 | (uint32_t)usbhost_getle16(val);
}
/****************************************************************************
* Name: usbhost_putle32
*
* Description:
* Put a (possibly unaligned) 32-bit little endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the little endian value.
* val - The 32-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_putle32(uint8_t *dest, uint32_t val)
{
/* Little endian means LS halfword first in byte stream */
usbhost_putle16(dest, (uint16_t)(val & 0xffff));
usbhost_putle16(dest+2, (uint16_t)(val >> 16));
}
/****************************************************************************
* Name: usbhost_tdalloc
*
* Description:
* Allocate transfer descriptor memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* On sucess, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static inline int usbhost_tdalloc(FAR struct usbhost_state_s *priv)
{
DEBUGASSERT(priv && priv->tdbuffer == NULL);
return DRVR_ALLOC(priv->drvr, &priv->tdbuffer, &priv->tdbuflen);
}
/****************************************************************************
* Name: usbhost_tdfree
*
* Description:
* Free transfer descriptor memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* On sucess, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static inline int usbhost_tdfree(FAR struct usbhost_state_s *priv)
{
int result = OK;
DEBUGASSERT(priv);
if (priv->tdbuffer)
{
DEBUGASSERT(priv->drvr);
result = DRVR_FREE(priv->drvr, priv->tdbuffer);
priv->tdbuffer = NULL;
priv->tdbuflen = 0;
}
return result;
}
/****************************************************************************
* struct usbhost_registry_s methods
****************************************************************************/
/****************************************************************************
* Name: usbhost_create
*
* Description:
* This function implements the create() method of struct usbhost_registry_s.
* The create() method is a callback into the class implementation. It is
* used to (1) create a new instance of the USB host class state and to (2)
* bind a USB host driver "session" to the class instance. Use of this
* create() method will support environments where there may be multiple
* USB ports and multiple USB devices simultaneously connected.
*
* Input Parameters:
* drvr - An instance of struct usbhost_driver_s that the class
* implementation will "bind" to its state structure and will
* subsequently use to communicate with the USB host driver.
* id - In the case where the device supports multiple base classes,
* subclasses, or protocols, this specifies which to configure for.
*
* Returned Values:
* On success, this function will return a non-NULL instance of struct
* usbhost_class_s that can be used by the USB host driver to communicate
* with the USB host class. NULL is returned on failure; this function
* will fail only if the drvr input parameter is NULL or if there are
* insufficient resources to create another USB host class instance.
*
****************************************************************************/
static FAR struct usbhost_class_s *usbhost_create(FAR struct usbhost_driver_s *drvr,
FAR const struct usbhost_id_s *id)
{
FAR struct usbhost_state_s *priv;
/* Allocate a USB host class instance */
priv = usbhost_allocclass();
if (priv)
{
/* Initialize the allocated storage class instance */
memset(priv, 0, sizeof(struct usbhost_state_s));
/* Assign a device number to this class instance */
if (usbhost_allocdevno(priv) == OK)
{
/* Initialize class method function pointers */
priv->class.connect = usbhost_connect;
priv->class.disconnected = usbhost_disconnected;
/* The initial reference count is 1... One reference is held by the driver */
priv->crefs = 1;
/* Initialize semphores (this works okay in the interrupt context) */
sem_init(&priv->exclsem, 0, 1);
/* Bind the driver to the storage class instance */
priv->drvr = drvr;
/* NOTE: We do not yet know the geometry of the USB mass storage device */
/* Return the instance of the USB mass storage class */
return &priv->class;
}
}
/* An error occurred. Free the allocation and return NULL on all failures */
if (priv)
{
usbhost_freeclass(priv);
}
return NULL;
}
/****************************************************************************
* struct usbhost_class_s methods
****************************************************************************/
/****************************************************************************
* Name: usbhost_connect
*
* Description:
* This function implements the connect() method of struct
* usbhost_class_s. This method is a callback into the class
* implementation. It is used to provide the device's configuration
* descriptor to the class so that the class may initialize properly
*
* Input Parameters:
* class - The USB host class entry previously obtained from a call to create().
* configdesc - A pointer to a uint8_t buffer container the configuration descripor.
* desclen - The length in bytes of the configuration descriptor.
* funcaddr - The USB address of the function containing the endpoint that EP0
* controls
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value is
* returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
****************************************************************************/
static int usbhost_connect(FAR struct usbhost_class_s *class,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)class;
int ret;
DEBUGASSERT(priv != NULL &&
configdesc != NULL &&
desclen >= sizeof(struct usb_cfgdesc_s));
/* Parse the configuration descriptor to get the endpoints */
ret = usbhost_cfgdesc(priv, configdesc, desclen, funcaddr);
if (ret != OK)
{
udbg("usbhost_cfgdesc() failed: %d\n", ret);
}
else
{
/* Now configure the device and register the NuttX driver */
ret = usbhost_devinit(priv);
if (ret != OK)
{
udbg("usbhost_devinit() failed: %d\n", ret);
}
}
return ret;
}
/****************************************************************************
* Name: usbhost_disconnected
*
* Description:
* This function implements the disconnected() method of struct
* usbhost_class_s. This method is a callback into the class
* implementation. It is used to inform the class that the USB device has
* been disconnected.
*
* Input Parameters:
* class - The USB host class entry previously obtained from a call to
* create().
*
* Returned Values:
* On success, zero (OK) is returned. On a failure, a negated errno value
* is returned indicating the nature of the failure
*
* Assumptions:
* This function may be called from an interrupt handler.
*
****************************************************************************/
static int usbhost_disconnected(struct usbhost_class_s *class)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)class;
irqstate_t flags;
DEBUGASSERT(priv != NULL);
/* Set an indication to any users of the mass storage device that the device
* is no longer available.
*/
flags = irqsave();
priv->disconnected = true;
/* Now check the number of references on the class instance. If it is one,
* then we can free the class instance now. Otherwise, we will have to
* wait until the holders of the references free them by closing the
* driver.
*/
ullvdbg("crefs: %d\n", priv->crefs);
if (priv->crefs == 1)
{
/* Destroy the class instance. If we are executing from an interrupt
* handler, then defer the destruction to the worker thread.
* Otherwise, destroy the instance now.
*/
if (up_interrupt_context())
{
/* Destroy the instance on the worker thread. */
uvdbg("Queuing destruction: worker %p->%p\n", priv->work.worker, usbhost_destroy);
/* Cancel the period polling thread */
(void)work_cancel(&priv->work);
DEBUGASSERT(priv->work.worker == NULL);
/* Then schedule the destruction */
(void)work_queue(&priv->work, usbhost_destroy, priv, 0);
}
else
{
/* Do the work now */
usbhost_destroy(priv);
}
}
irqrestore(flags);
return OK;
}
/****************************************************************************
* Character driver methods
****************************************************************************/
/****************************************************************************
* Name: usbhost_read
*
* Description:
* Standard character driver read method.
*
****************************************************************************/
static ssize_t usbhost_read(FAR struct file *filp, FAR char *buffer, size_t len)
{
return 0; /* Return EOF for now */
}
/****************************************************************************
* Name: usbhost_write
*
* Description:
* Standard character driver write method.
*
****************************************************************************/
static ssize_t usbhost_write(FAR struct file *filp, FAR const char *buffer, size_t len)
{
return len; /* Say that everything was written for now */
}
/****************************************************************************
* Name: usbhost_poll
*
* Description:
* Standard character driver poll method.
*
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static int usbhost_poll(FAR struct file *filp, FAR struct pollfd *fds,
bool setup)
{
if (setup)
{
fds->revents |= (fds->events & (POLLIN|POLLOUT));
if (fds->revents != 0)
{
sem_post(fds->sem);
}
}
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_kbdinit
*
* Description:
* Initialize the USB storage HID keyboard class driver. This function
* should be called be platform-specific code in order to initialize and
* register support for the USB host HID keyboard class device.
*
* Input Parameters:
* None
*
* Returned Values:
* On success this function will return zero (OK); A negated errno value
* will be returned on failure.
*
****************************************************************************/
int usbhost_kbdinit(void)
{
/* Perform any one-time initialization of the class implementation */
/* Advertise our availability to support (certain) devices */
return usbhost_registerclass(&g_skeleton);
}
