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px4-firmware/nuttx/drivers/usbhost/usbhost_hidkbd.c

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/****************************************************************************
* drivers/usbhost/usbhost_hidkbd.c
*
* Copyright (C) 2011 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 <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <poll.h>
#include <semaphore.h>
#include <time.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/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>
/* Don't compile if prerequisites are not met */
#if defined(CONFIG_USBHOST) && !defined(CONFIG_USBHOST_INT_DISABLE) && CONFIG_NFILE_DESCRIPTORS > 0
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* This determines how often the USB keyboard will be polled in units of
* of microseconds. The default is 100MS.
*/
#ifndef CONFIG_HIDKBD_POLLUSEC
# define CONFIG_HIDKBD_POLLUSEC (100*1000)
#endif
/* Worker thread is needed, unfortunately, to handle some cornercase failure
* conditions. This is kind of wasteful and begs for a re-design.
*/
#ifndef CONFIG_SCHED_WORKQUEUE
# warning "Worker thread support is required (CONFIG_SCHED_WORKQUEUE)"
#endif
/* Signals must not be disabled as they are needed by usleep. Need to have
* CONFIG_DISABLE_SIGNALS=n
*/
#ifdef CONFIG_DISABLE_SIGNALS
# warning "Signal support is required (CONFIG_DISABLE_SIGNALS)"
#endif
/* Provide some default values for other configuration settings */
#ifndef CONFIG_HIDKBD_DEFPRIO
# define CONFIG_HIDKBD_DEFPRIO 50
#endif
#ifndef CONFIG_HIDKBD_STACKSIZE
# define CONFIG_HIDKBD_STACKSIZE 1024
#endif
#ifndef CONFIG_HIDKBD_BUFSIZE
# define CONFIG_HIDKBD_BUFSIZE 64
#endif
#ifndef CONFIG_HIDKBD_NPOLLWAITERS
# define CONFIG_HIDKBD_NPOLLWAITERS 2
#endif
/* The default is to support scancode mapping for the standard 104 key
* keyboard. Setting CONFIG_HIDKBD_RAWSCANCODES will disable all scancode
* mapping; Setting CONFIG_HIDKBD_ALLSCANCODES will enable mapping of all
* scancodes;
*/
#ifndef CONFIG_HIDKBD_RAWSCANCODES
# ifdef CONFIG_HIDKBD_ALLSCANCODES
# define USBHID_NUMSCANCODES (USBHID_KBDUSE_MAX+1)
# else
# define USBHID_NUMSCANCODES 104
# endif
#endif
/* Driver support ***********************************************************/
/* This format is used to construct the /dev/kbd[n] device driver path. It
* defined here so that it will be used consistently in all places.
*/
#define DEV_FORMAT "/dev/kbd%c"
#define DEV_NAMELEN 11
/* 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_ALLFOUND (USBHOST_RQDFOUND|USBHOST_EPOUTFOUND)
#define USBHOST_MAX_CREFS 0x7fff
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure contains the internal, private state of the USB host
* keyboard 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 keyboard class driver */
char devchar; /* Character identifying the /dev/kbd[n] device */
volatile bool disconnected; /* TRUE: Device has been disconnected */
volatile bool polling; /* TRUE: Poll thread is running */
volatile bool open; /* TRUE: The keyboard device is open */
volatile bool waiting; /* TRUE: waiting for keyboard data */
uint8_t ifno; /* Interface number */
int16_t crefs; /* Reference count on the driver instance */
sem_t exclsem; /* Used to maintain mutual exclusive access */
sem_t waitsem; /* Used to wait for keyboard data */
FAR uint8_t *tbuffer; /* The allocated transfer buffer */
size_t tbuflen; /* Size of the allocated transfer buffer */
pid_t pollpid; /* PID of the poll task */
struct work_s work; /* For cornercase error handling by the worker thread */
/* 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 */
/* The following is a list if poll structures of threads waiting for
* driver events. The 'struct pollfd' reference for each open is also
* retained in the f_priv field of the 'struct file'.
*/
#ifndef CONFIG_DISABLE_POLL
struct pollfd *fds[CONFIG_HIDKBD_NPOLLWAITERS];
#endif
/* Buffer used to collect and buffer incoming keyboard characters */
volatile uint16_t headndx; /* Buffer head index */
volatile uint16_t tailndx; /* Buffer tail index */
uint8_t kbdbuffer[CONFIG_HIDKBD_BUFSIZE];
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Semaphores */
static void usbhost_takesem(sem_t *sem);
#define usbhost_givesem(s) sem_post(s);
/* Polling support */
#ifndef CONFIG_DISABLE_POLL
static void usbhost_pollnotify(FAR struct usbhost_state_s *dev);
#else
# define usbhost_pollnotify(dev)
#endif
/* 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);
/* Keyboard polling thread */
static void usbhost_destroy(FAR void *arg);
static inline uint8_t usbhost_mapscancode(uint8_t scancode, uint8_t modifier);
static int usbhost_kbdpoll(int argc, char *argv[]);
/* 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);
#if 0 /* Not used */
static void usbhost_putle32(uint8_t *dest, uint32_t val);
#endif
/* 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 int usbhost_open(FAR struct file *filep);
static int usbhost_close(FAR struct file *filep);
static ssize_t usbhost_read(FAR struct file *filep,
FAR char *buffer, size_t len);
static ssize_t usbhost_write(FAR struct file *filep,
FAR const char *buffer, size_t len);
#ifndef CONFIG_DISABLE_POLL
static int usbhost_poll(FAR struct file *filep, 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 keyboard class driver 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 =
{
usbhost_open, /* open */
usbhost_close, /* 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/kbda-z. */
static uint32_t g_devinuse;
/* The following are used to managed the class creation operation */
static sem_t g_exclsem; /* For mutually exclusive thread creation */
static sem_t g_syncsem; /* Thread data passing interlock */
static struct usbhost_state_s *g_priv; /* Data passed to thread */
/* The following tables map keyboard scan codes to printable ASIC
* characters. There is no support here for function keys or cursor
* controls.
*/
#ifndef CONFIG_HIDKBD_RAWSCANCODES
static const uint8_t ucmap[USBHID_NUMSCANCODES] =
{
0, 0, 0, 0, 'A', 'B', 'C', 'D', /* 0x00-0x07: Reserved, errors, A-D */
'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', /* 0x08-0x0f: E-L */
'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', /* 0x10-0x17: M-T */
'U', 'V', 'W', 'X', 'Y', 'Z', '!', '@', /* 0x18-0x1f: U-Z,!,@ */
'#', '$', '%', '^', '&', '*', '(', ')', /* 0x20-0x27: #,$,%,^,&,*,(,) */
'\n', '\033', '\177', 0, ' ', '_', '+', '{', /* 0x28-0x2f: Enter,escape,del,back-tab,space,_,+,{ */
'}', '|', 0, ':', '"', 0, '<', '>', /* 0x30-0x37: },|,Non-US tilde,:,",grave tidle,<,> */
'?', 0, 0, 0, 0, 0, 0, 0, /* 0x38-0x3f: /,CapsLock,F1,F2,F3,F4,F5,F6 */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x40-0x47: F7,F8,F9,F10,F11,F12,PrtScn,sScrollLock */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x48-0x4f: Pause,Insert,Home,PageUp,DeleteForward,End,PageDown,RightArrow */
0, 0, 0, 0, '/', '*', '-', '+', /* 0x50-0x57: LeftArrow,DownArrow,UpArrow,Num Lock,/,*,-,+ */
'\n', '1', '2', '3', '4', '4', '6', '7', /* 0x58-0x5f: Enter,1-7 */
'8', '9', '0', '.', 0, 0, 0, '=', /* 0x60-0x67: 8-9,0,.,Non-US \,Application,Power,= */
#ifdef CONFIG_HIDKBD_ALLSCANCODES
0, 0, 0, 0, 0, 0, 0, 0, /* 0x68-0x6f: F13,F14,F15,F16,F17,F18,F19,F20 */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x70-0x77: F21,F22,F23,F24,Execute,Help,Menu,Select */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x78-0x7f: Stop,Again,Undo,Cut,Copy,Paste,Find,Mute */
0, 0, 0, 0, 0, ',', 0, 0, /* 0x80-0x87: VolUp,VolDown,LCapsLock,lNumLock,LScrollLock,,,=,International1 */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x88-0x8f: International 2-9 */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x90-0x97: LAN 1-8 */
0, 0, 0, 0, 0, 0, '\n', 0, /* 0x98-0x9f: LAN 9,Ease,SysReq,Cancel,Clear,Prior,Return,Separator */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0-0xa7: Out,Oper,Clear,CrSel,Excel,(reserved) */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xa8-0xaf: (reserved) */
0, 0, 0, 0, 0, 0, '(', ')', /* 0xb0-0xb7: 00,000,ThouSeparator,DecSeparator,CurrencyUnit,SubUnit,(,) */
'{', '}', '\t', \177, 'A', 'B', 'C', 'D', /* 0xb8-0xbf: {,},tab,backspace,A-D */
'F', 'F', 0, '^', '%', '<', '>', '&', /* 0xc0-0xc7: E-F,XOR,^,%,<,>,& */
0, '|', 0, ':', '%', ' ', '@', '!', /* 0xc8-0xcf: &&,|,||,:,#, ,@,! */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0-0xd7: Memory Store,Recall,Clear,Add,Subtract,Muliply,Divide,+/- */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xd8-0xdf: Clear,ClearEntry,Binary,Octal,Decimal,Hexadecimal */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0-0xe7: Left Ctrl,Shift,Alt,GUI, Right Ctrl,Shift,Alt,GUI */
#endif
};
static const uint8_t lcmap[USBHID_NUMSCANCODES] =
{
0, 0, 0, 0, 'a', 'b', 'c', 'd', /* 0x00-0x07: Reserved, errors, a-d */
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', /* 0x08-0x0f: e-l */
'm', 'n', 'o', 'p', 'q', 'r', 's', 't', /* 0x10-0x17: m-t */
'u', 'v', 'w', 'x', 'y', 'z', '1', '2', /* 0x18-0x1f: u-z,1-2 */
'3', '4', '5', '6', '7', '8', '9', '0', /* 0x20-0x27: 3-9,0 */
'\n', '\033', '\177', '\t', ' ', '-', '=', '[', /* 0x28-0x2f: Enter,escape,del,tab,space,-,=,[ */
']', '\\', '\234', ';', '\'', 0, ',', '.', /* 0x30-0x37: ],\,Non-US pound,;,',grave accent,,,. */
'/', 0, 0, 0, 0, 0, 0, 0, /* 0x38-0x3f: /,CapsLock,F1,F2,F3,F4,F5,F6 */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x40-0x47: F7,F8,F9,F10,F11,F12,PrtScn,ScrollLock */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x48-0x4f: Pause,Insert,Home,PageUp,DeleteForward,End,PageDown,RightArrow */
0, 0, 0, 0, '/', '*', '-', '+', /* 0x50-0x57: LeftArrow,DownArrow,UpArrow,Num Lock,/,*,-,+ */
'\n', '1', '2', '3', '4', '4', '6', '7', /* 0x58-0x5f: Enter,1-7 */
'8', '9', '0', '.', 0, 0, 0, '=', /* 0x60-0x67: 8-9,0,.,Non-US \,Application,Power,= */
#ifdef CONFIG_HIDKBD_ALLSCANCODES
0, 0, 0, 0, 0, 0, 0, 0, /* 0x68-0x6f: F13,F14,F15,F16,F17,F18,F19,F20 */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x70-0x77: F21,F22,F23,F24,Execute,Help,Menu,Select */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x78-0x7f: Stop,Again,Undo,Cut,Copy,Paste,Find,Mute */
0, 0, 0, 0, 0, ',', 0, 0, /* 0x80-0x87: VolUp,VolDown,LCapsLock,lNumLock,LScrollLock,,,=,International1 */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x88-0x8f: International 2-9 */
0, 0, 0, 0, 0, 0, 0, 0, /* 0x90-0x97: LAN 1-8 */
0, 0, 0, 0, 0, 0, '\n', 0, /* 0x98-0x9f: LAN 9,Ease,SysReq,Cancel,Clear,Prior,Return,Separator */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0-0xa7: Out,Oper,Clear,CrSel,Excel,(reserved) */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xa8-0xaf: (reserved) */
0, 0, 0, 0, 0, 0, '(', ')', /* 0xb0-0xb7: 00,000,ThouSeparator,DecSeparator,CurrencyUnit,SubUnit,(,) */
'{', '}', '\t', '\177', 'A', 'B', 'C', 'D', /* 0xb8-0xbf: {,},tab,backspace,A-D */
'F', 'F', 0, '^', '%', '<', '>', '&', /* 0xc0-0xc7: E-F,XOR,^,%,<,>,& */
0, '|', 0, ':', '%', ' ', '@', '!', /* 0xc8-0xcf: &&,|,||,:,#, ,@,! */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0-0xd7: Memory Store,Recall,Clear,Add,Subtract,Muliply,Divide,+/- */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xd8-0xdf: Clear,ClearEntry,Binary,Octal,Decimal,Hexadecimal */
0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0-0xe7: Left Ctrl,Shift,Alt,GUI, Right Ctrl,Shift,Alt,GUI */
#endif
};
#endif /* CONFIG_HIDKBD_RAWSCANCODES */
/****************************************************************************
* 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_pollnotify
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static void usbhost_pollnotify(FAR struct usbhost_state_s *priv)
{
int i;
for (i = 0; i < CONFIG_HIDKBD_NPOLLWAITERS; i++)
{
struct pollfd *fds = priv->fds[i];
if (fds)
{
fds->revents |= (fds->events & POLLIN);
if (fds->revents != 0)
{
uvdbg("Report events: %02x\n", fds->revents);
sem_post(fds->sem);
}
}
}
}
#endif
/****************************************************************************
* 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 *)kmalloc(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. */
uvdbg("Freeing: %p\n", class);;
kfree(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->devchar = 'a' + devno;
irqrestore(flags);
return OK;
}
}
irqrestore(flags);
return -EMFILE;
}
static void usbhost_freedevno(FAR struct usbhost_state_s *priv)
{
int devno = 'a' - priv->devchar;
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->devchar);
}
/****************************************************************************
* 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);
sem_destroy(&priv->waitsem);
/* 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_mapscancode
*
* Description:
* Map a keyboard scancode to a printable ASCII character. There is no
* support here for function keys or cursor controls in this version of
* the driver.
*
* Input Parameters:
* scancode - Scan code to be mapped.
* modifier - Ctrl,Alt,Shift,GUI modifier bits
*
* Returned Values:
* None
*
****************************************************************************/
static inline uint8_t usbhost_mapscancode(uint8_t scancode, uint8_t modifier)
{
#ifndef CONFIG_HIDKBD_RAWSCANCODES
/* Range check */
if (scancode >= USBHID_NUMSCANCODES)
{
return 0;
}
/* Is either shift key pressed? */
if ((modifier & (USBHID_MODIFER_LSHIFT|USBHID_MODIFER_RSHIFT)) != 0)
{
return ucmap[scancode];
}
else
{
return lcmap[scancode];
}
#else
return scancode;
#endif
}
/****************************************************************************
* 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 int usbhost_kbdpoll(int argc, char *argv[])
{
FAR struct usbhost_state_s *priv;
FAR struct usb_ctrlreq_s *ctrlreq;
#ifndef CONFIG_HIDKBD_NODEBOUNCE
uint8_t lastkey[6] = {0, 0, 0, 0, 0, 0};
#endif
#if defined(CONFIG_DEBUG_USB) && defined(CONFIG_DEBUG_VERBOSE)
unsigned int npolls = 0;
#endif
unsigned int nerrors = 0;
int ret;
uvdbg("Started\n");
/* Synchronize with the start-up logic. Get the private instance, re-start
* the start-up logic, and wait a bit to make sure that all of the class
* creation logic has a chance to run to completion.
*
* NOTE: that the reference count is incremented here. Therefore, we know
* that the driver data structure will remain stable while this thread is
* running.
*/
priv = g_priv;
DEBUGASSERT(priv != NULL);
priv->polling = true;
priv->crefs++;
usbhost_givesem(&g_syncsem);
sleep(1);
/* Loop here until the device is disconnected */
uvdbg("Entering poll loop\n");
while (!priv->disconnected)
{
/* Make sure that we have exclusive access to the private data
* structure. There may now be other tasks with the character driver
* open and actively trying to interact with the class driver.
*/
usbhost_takesem(&priv->exclsem);
/* Format the HID report request:
*
* bmRequestType 10100001
* bRequest GET_REPORT (0x01)
* wValue Report Type and Report Index
* wIndex Interface Number
* wLength Descriptor Length
* Data Descriptor Data
*/
ctrlreq = (struct usb_ctrlreq_s *)priv->tbuffer;
ctrlreq->type = USB_REQ_DIR_IN|USB_REQ_TYPE_CLASS|USB_REQ_RECIPIENT_INTERFACE;
ctrlreq->req = USBHID_REQUEST_GETREPORT;
usbhost_putle16(ctrlreq->value, (USBHID_REPORTTYPE_INPUT << 8));
usbhost_putle16(ctrlreq->index, priv->ifno);
usbhost_putle16(ctrlreq->len, sizeof(struct usbhid_kbdreport_s));
/* Send HID report request */
ret = DRVR_CTRLIN(priv->drvr, ctrlreq, priv->tbuffer);
usbhost_givesem(&priv->exclsem);
/* Check for errors -- Bail if an excessive number of errors
* are encountered.
*/
if (ret != OK)
{
nerrors++;
udbg("ERROR: GETREPORT/INPUT, DRVR_CTRLIN returned: %d/%d\n",
ret, nerrors);
if (nerrors > 200)
{
udbg("Too many errors... aborting: %d\n", nerrors);
break;
}
}
/* The report was received correctly. But ignore the keystrokes if no
* task has opened the driver.
*/
else if (priv->open)
{
struct usbhid_kbdreport_s *rpt = (struct usbhid_kbdreport_s *)priv->tbuffer;
unsigned int head;
unsigned int tail;
uint8_t ascii;
int i;
/* Add the newly received keystrokes to our internal buffer */
usbhost_takesem(&priv->exclsem);
head = priv->headndx;
tail = priv->tailndx;
for (i = 0; i < 6; i++)
{
/* Is this key pressed? But not pressed last time?
* HID spec: "The order of keycodes in array fields has no
* significance. Order determination is done by the host
* software comparing the contents of the previous report to
* the current report. If two or more keys are reported in
* one report, their order is indeterminate. Keyboards may
* buffer events that would have otherwise resulted in
* multiple event in a single report.
*
* "'Repeat Rate' and 'Delay Before First Repeat' are
* implemented by the host and not in the keyboard (this
* means the BIOS in legacy mode). The host may use the
* device report rate and the number of reports to determine
* how long a key is being held down. Alternatively, the host
* may use its own clock or the idle request for the timing
* of these features."
*/
if (rpt->key[i] != USBHID_KBDUSE_NONE
#ifndef CONFIG_HIDKBD_NODEBOUNCE
&& rpt->key[i] != lastkey[i]
#endif
)
{
/* Yes.. Add it to the buffer. */
/* Map the keyboard scancode to a printable ASCII
* character. There is no support here for function keys
* or cursor controls in this version of the driver.
*/
ascii = usbhost_mapscancode(rpt->key[i], rpt->modifier);
uvdbg("Key %d: %02x ASCII:%c modifier: %02x\n",
i, rpt->key[i], ascii ? ascii : ' ', rpt->modifier);
/* Zero at this point means that the key does not map to a
* printable character.
*/
if (ascii != 0)
{
/* Handle control characters. Zero after this means
* a valid, NUL character.
*/
if ((rpt->modifier & (USBHID_MODIFER_LCTRL|USBHID_MODIFER_RCTRL)) != 0)
{
ascii &= 0x1f;
}
/* Copy the next keyboard character into the user
* buffer.
*/
priv->kbdbuffer[head] = ascii;
/* Increment the head index */
if (++head >= CONFIG_HIDKBD_BUFSIZE)
{
head = 0;
}
/* If the buffer is full, then increment the tail
* index to make space. Is it better to lose old
* keystrokes or new?
*/
if (tail == head)
{
if (++tail >= CONFIG_HIDKBD_BUFSIZE)
{
tail = 0;
}
}
}
}
/* Save the scancode (or lack thereof) for key debouncing on
* next keyboard report.
*/
#ifndef CONFIG_HIDKBD_NODEBOUNCE
lastkey[i] = rpt->key[i];
#endif
}
/* Did we just transition from no data available to data available? */
if (head != tail && priv->headndx == priv->tailndx)
{
/* Yes.. Is there a thread waiting for keyboard data now? */
if (priv->waiting)
{
/* Yes.. wake it up */
usbhost_givesem(&priv->waitsem);
priv->waiting = false;
}
/* And wake up any threads waiting for the POLLIN event */
usbhost_pollnotify(priv);
}
/* Update the head/tail indices */
priv->headndx = head;
priv->tailndx = tail;
usbhost_givesem(&priv->exclsem);
}
/* If USB debug is on, then provide some periodic indication that
* polling is still happening.
*/
#if defined(CONFIG_DEBUG_USB) && defined(CONFIG_DEBUG_VERBOSE)
npolls++;
if ((npolls & 31) == 0)
{
udbg("Still polling: %d\n", npolls);
}
#endif
/* Wait for the required amount (or until a signal is received). We
* will wake up when either the delay elapses or we are signalled that
* the device has been disconnected.
*/
usleep(CONFIG_HIDKBD_POLLUSEC);
}
/* We get here when the driver is removed.. or when too many errors have
* been encountered.
*
* Make sure that we have exclusive access to the private data structure.
* There may now be other tasks with the character driver open and actively
* trying to interact with the class driver.
*/
usbhost_takesem(&priv->exclsem);
/* Indicate that we are no longer running and decrement the reference
* count help by this thread. If there are no other users of the class,
* we can destroy it now. Otherwise, we have to wait until the all
* of the file descriptors are closed.
*/
udbg("Keyboard removed, polling halted\n");
priv->polling = false;
if (--priv->crefs < 2)
{
/* Destroy the instance (while we hold the semaphore!) */
usbhost_destroy(priv);
}
else
{
/* No, we will destroy the driver instance when it is finally closed */
usbhost_givesem(&priv->exclsem);
}
return 0;
}
/****************************************************************************
* 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;
bool done = false;
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) && !done)
{
/* 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:
{
FAR struct usb_ifdesc_s *ifdesc = (FAR struct usb_ifdesc_s *)configdesc;
uvdbg("Interface descriptor\n");
DEBUGASSERT(remaining >= USB_SIZEOF_IFDESC);
/* Did we already find what we needed from a preceding interface? */
if ((found & USBHOST_RQDFOUND) == USBHOST_RQDFOUND)
{
/* Yes.. then break out of the loop and use the preceding
* interface.
*/
done = true;
}
else
{
/* Otherwise, save the interface number and discard any
* endpoints previously found
*/
priv->ifno = ifdesc->ifno;
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.xfrtype = USB_EP_ATTR_XFER_INT;
epoutdesc.interval = epdesc->interval;
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.xfrtype = USB_EP_ATTR_XFER_INT;
epindesc.interval = epdesc->interval;
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;
}
/* What we found everything that we are going to find? */
if (found == USBHOST_ALLFOUND)
{
/* Yes.. then break out of the loop and use the preceding interface */
done = true;
}
/* 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)
{
char devname[DEV_NAMELEN];
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);
/* Start a worker task to poll the USB device. It would be nice to used the
* the NuttX worker thread to do this, but this task needs to wait for events
* and activities on the worker thread should not involve significant waiting.
* Having a dedicated thread is more efficient in this sense, but requires more
* memory resources, primarily for the dedicated stack (CONFIG_HIDKBD_STACKSIZE).
*/
uvdbg("user_start: Start poll task\n");
/* The inputs to a task started by task_create() are very awkard for this
* purpose. They are really designed for command line tasks (argc/argv). So
* the following is kludge pass binary data when the keyboard poll task
* is started.
*
* First, make sure we have exclusive access to g_priv (what is the likelihood
* of this being used? About zero, but we protect it anyway).
*/
usbhost_takesem(&g_exclsem);
g_priv = priv;
#ifndef CONFIG_CUSTOM_STACK
priv->pollpid = task_create("usbhost", CONFIG_HIDKBD_DEFPRIO,
CONFIG_HIDKBD_STACKSIZE,
(main_t)usbhost_kbdpoll, (const char **)NULL);
#else
priv->pollpid = task_create("usbhost", CONFIG_HIDKBD_DEFPRIO,
(main_t)usbhost_kbdpoll, (const char **)NULL);
#endif
if (priv->pollpid == ERROR)
{
/* Failed to started the poll thread... probably due to memory resources */
usbhost_givesem(&g_exclsem);
ret = -ENOMEM;
goto errout;
}
/* Now wait for the poll task to get properly initialized */
usbhost_takesem(&g_syncsem);
usbhost_givesem(&g_exclsem);
/* Register the driver */
uvdbg("Register driver\n");
usbhost_mkdevname(priv, devname);
ret = register_driver(devname, &usbhost_fops, 0666, priv);
/* We now have to be concerned about asynchronous modification of crefs
* because the driver has been registerd.
*/
errout:
usbhost_takesem(&priv->exclsem);
priv->crefs--;
usbhost_givesem(&priv->exclsem);
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
*
****************************************************************************/
#if 0 /* Not used */
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));
}
#endif
/****************************************************************************
* Name: usbhost_tdalloc
*
* Description:
* Allocate transfer buffer 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->tbuffer == NULL);
return DRVR_ALLOC(priv->drvr, &priv->tbuffer, &priv->tbuflen);
}
/****************************************************************************
* Name: usbhost_tdfree
*
* Description:
* Free transfer buffer 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->tbuffer)
{
DEBUGASSERT(priv->drvr);
result = DRVR_FREE(priv->drvr, priv->tbuffer);
priv->tbuffer = NULL;
priv->tbuflen = 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 semaphores */
sem_init(&priv->exclsem, 0, 1);
sem_init(&priv->waitsem, 0, 0);
/* Bind the driver to the storage class instance */
priv->drvr = drvr;
/* Return the instance of the USB keyboard class driver */
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
*
* NOTE that the class instance remains valid upon return with a failure. It is
* the responsibility of the higher level enumeration logic to call
* CLASS_DISCONNECTED to free up the class driver resources.
*
* Assumptions:
* - This function will *not* be called from an interrupt handler.
* - If this function returns an error, the USB host controller driver
* must call to DISCONNECTED method to recover from the error
*
****************************************************************************/
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);
}
}
/* ERROR handling: Do nothing. If we return and error during connection,
* the driver is required to call the DISCONNECT method. Possibilities:
*
* - Failure occurred before the kbdpoll task was started successfully.
* In this case, the disconnection will have to be handled on the worker
* task.
* - Failure occured after the kbdpoll task was started succesffuly. In
* this case, the disconnetion can be performed on the kbdpoll thread.
*/
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;
DEBUGASSERT(priv != NULL);
/* Set an indication to any users of the keyboard device that the device
* is no longer available.
*/
priv->disconnected = true;
ullvdbg("Disconnected\n");
/* Is there a thread waiting for keyboard data that will never come? */
if (priv->waiting)
{
/* Yes.. wake it up */
usbhost_givesem(&priv->waitsem);
priv->waiting = false;
}
/* Possibilities:
*
* - Failure occurred before the kbdpoll task was started successfully.
* In this case, the disconnection will have to be handled on the worker
* task.
* - Failure occured after the kbdpoll task was started succesffuly. In
* this case, the disconnetion can be performed on the kbdpoll thread.
*/
if (priv->polling)
{
/* The polling task is still alive. Signal the keyboard polling task.
* When that task wakes up, it will decrement the reference count and,
* perhaps, destroy the class instance. Then it will exit.
*/
(void)kill(priv->pollpid, SIGALRM);
}
else
{
/* In the case where the failure occurs before the polling task was
* started. Now what? We are probably executing from an interrupt
* handler here. We will use the worker thread. This is kind of
* wasteful and begs for a re-design.
*/
DEBUGASSERT(priv->work.worker == NULL);
(void)work_queue(HPWORK, &priv->work, usbhost_destroy, priv, 0);
}
return OK;
}
/****************************************************************************
* Character driver methods
****************************************************************************/
/****************************************************************************
* Name: usbhost_open
*
* Description:
* Standard character driver open method.
*
****************************************************************************/
static int usbhost_open(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct usbhost_state_s *priv;
irqstate_t flags;
int ret;
uvdbg("Entry\n");
DEBUGASSERT(filep && filep->f_inode);
inode = filep->f_inode;
priv = inode->i_private;
/* Make sure that we have exclusive access to the private data structure */
DEBUGASSERT(priv && priv->crefs > 0 && priv->crefs < USBHOST_MAX_CREFS);
usbhost_takesem(&priv->exclsem);
/* Check if the keyboard device is still connected. We need to disable
* interrupts momentarily to assure that there are no asynchronous disconnect
* events.
*/
flags = irqsave();
if (priv->disconnected)
{
/* No... the driver is no longer bound to the class. That means that
* the USB storage device is no longer connected. Refuse any further
* attempts to open the driver.
*/
ret = -ENODEV;
}
else
{
/* Otherwise, just increment the reference count on the driver */
priv->crefs++;
priv->open = true;
ret = OK;
}
irqrestore(flags);
usbhost_givesem(&priv->exclsem);
return ret;
}
/****************************************************************************
* Name: usbhost_close
*
* Description:
* Standard character driver close method.
*
****************************************************************************/
static int usbhost_close(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct usbhost_state_s *priv;
uvdbg("Entry\n");
DEBUGASSERT(filep && filep->f_inode);
inode = filep->f_inode;
priv = inode->i_private;
/* Decrement the reference count on the driver */
DEBUGASSERT(priv->crefs > 1);
usbhost_takesem(&priv->exclsem);
priv->crefs--;
/* Is this the last reference (other than the one held by the USB host
* controller driver)
*/
if (priv->crefs <= 1)
{
irqstate_t flags;
/* Yes.. then the driver is no longer open */
priv->open = false;
priv->headndx = 0;
priv->tailndx = 0;
/* We need to disable interrupts momentarily to assure that there are
* no asynchronous disconnect events.
*/
flags = irqsave();
/* Check if the USB keyboard device is still connected. If the device is
* no longer connected, then unregister the driver and free the driver
* class instance.
*/
if (priv->disconnected)
{
/* Destroy the class instance (we can't use priv after this; we can't
* 'give' the semapore)
*/
usbhost_destroy(priv);
irqrestore(flags);
return OK;
}
irqrestore(flags);
}
usbhost_givesem(&priv->exclsem);
return OK;
}
/****************************************************************************
* Name: usbhost_read
*
* Description:
* Standard character driver read method.
*
****************************************************************************/
static ssize_t usbhost_read(FAR struct file *filep, FAR char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct usbhost_state_s *priv;
size_t nbytes;
unsigned int tail;
int ret;
uvdbg("Entry\n");
DEBUGASSERT(filep && filep->f_inode && buffer);
inode = filep->f_inode;
priv = inode->i_private;
/* Make sure that we have exclusive access to the private data structure */
DEBUGASSERT(priv && priv->crefs > 0 && priv->crefs < USBHOST_MAX_CREFS);
usbhost_takesem(&priv->exclsem);
/* Check if the keyboard is still connected. We need to disable interrupts
* momentarily to assure that there are no asynchronous disconnect events.
*/
if (priv->disconnected)
{
/* No... the driver is no longer bound to the class. That means that
* the USB keybaord is no longer connected. Refuse any further attempts
* to access the driver.
*/
ret = -ENODEV;
}
else
{
/* Is there keyboard data now? */
while (priv->tailndx == priv->headndx)
{
/* No.. were we open non-blocking? */
if (filep->f_oflags & O_NONBLOCK)
{
/* Yes.. then return a failure */
ret = -EAGAIN;
goto errout;
}
/* Wait for data to be available */
uvdbg("Waiting...\n");
priv->waiting = true;
usbhost_givesem(&priv->exclsem);
usbhost_takesem(&priv->waitsem);
usbhost_takesem(&priv->exclsem);
/* Did the keyboard become disconnected while we were waiting */
if (priv->disconnected)
{
ret = -ENODEV;
goto errout;
}
}
/* Read data from our internal buffer of received characters */
for (tail = priv->tailndx, nbytes = 0;
tail != priv->headndx && nbytes < len;
nbytes++)
{
/* Copy the next keyboard character into the user buffer */
*buffer++ = priv->kbdbuffer[tail];
/* Handle wrap-around of the tail index */
if (++tail >= CONFIG_HIDKBD_BUFSIZE)
{
tail = 0;
}
}
ret = nbytes;
/* Update the tail index (pehaps marking the buffer empty) */
priv->tailndx = tail;
}
errout:
usbhost_givesem(&priv->exclsem);
return (ssize_t)ret;
}
/****************************************************************************
* Name: usbhost_write
*
* Description:
* Standard character driver write method.
*
****************************************************************************/
static ssize_t usbhost_write(FAR struct file *filep, FAR const char *buffer, size_t len)
{
/* We won't try to write to the keyboard */
return -ENOSYS;
}
/****************************************************************************
* Name: usbhost_poll
*
* Description:
* Standard character driver poll method.
*
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static int usbhost_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup)
{
FAR struct inode *inode;
FAR struct usbhost_state_s *priv;
int ret = OK;
int i;
uvdbg("Entry\n");
DEBUGASSERT(filep && filep->f_inode && fds);
inode = filep->f_inode;
priv = inode->i_private;
/* Make sure that we have exclusive access to the private data structure */
DEBUGASSERT(priv);
usbhost_takesem(&priv->exclsem);
/* Check if the keyboard is still connected. We need to disable interrupts
* momentarily to assure that there are no asynchronous disconnect events.
*/
if (priv->disconnected)
{
/* No... the driver is no longer bound to the class. That means that
* the USB keybaord is no longer connected. Refuse any further attempts
* to access the driver.
*/
ret = -ENODEV;
}
else if (setup)
{
/* This is a request to set up the poll. Find an availableslot for
* the poll structure reference
*/
for (i = 0; i < CONFIG_HIDKBD_NPOLLWAITERS; i++)
{
/* Find an available slot */
if (!priv->fds[i])
{
/* Bind the poll structure and this slot */
priv->fds[i] = fds;
fds->priv = &priv->fds[i];
break;
}
}
if (i >= CONFIG_HIDKBD_NPOLLWAITERS)
{
fds->priv = NULL;
ret = -EBUSY;
goto errout;
}
/* Should we immediately notify on any of the requested events? Notify
* the POLLIN event if there is buffered keyboard data.
*/
if (priv->headndx != priv->tailndx)
{
usbhost_pollnotify(priv);
}
}
else
{
/* This is a request to tear down the poll. */
struct pollfd **slot = (struct pollfd **)fds->priv;
DEBUGASSERT(slot);
/* Remove all memory of the poll setup */
*slot = NULL;
fds->priv = NULL;
}
errout:
sem_post(&priv->exclsem);
return ret;
}
#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 */
sem_init(&g_exclsem, 0, 1);
sem_init(&g_syncsem, 0, 0);
/* Advertise our availability to support (certain) devices */
return usbhost_registerclass(&g_skeleton);
}
#endif /* CONFIG_USBHOST)&& !CONFIG_USBHOST_INT_DISABLE && CONFIG_NFILE_DESCRIPTORS */
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