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nuttx/drivers/usbhost/usbhost_hidkbd.c
Petro Karashchenko d499ac9d58 nuttx: fix multiple 'FAR', 'CODE' and style issues 
Signed-off-by: Petro Karashchenko <petro.karashchenko@gmail.com>
2024-08-25 19:22:15 +08:00

2899 lines
86 KiB
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/****************************************************************************
* drivers/usbhost/usbhost_hidkbd.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* 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 <signal.h>
#include <time.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/kmalloc.h>
#include <nuttx/kthread.h>
#include <nuttx/arch.h>
#include <nuttx/wqueue.h>
#include <nuttx/signal.h>
#include <nuttx/mutex.h>
#include <nuttx/semaphore.h>
#include <nuttx/fs/fs.h>
#include <nuttx/usb/usb.h>
#include <nuttx/usb/usbhost.h>
#include <nuttx/usb/hid.h>
#include <nuttx/usb/usbhost_devaddr.h>
#ifdef CONFIG_HIDKBD_ENCODED
# include <nuttx/streams.h>
# include <nuttx/input/kbd_codec.h>
#endif
/* Don't compile if prerequisites are not met */
#if defined(CONFIG_USBHOST) && !defined(CONFIG_USBHOST_INT_DISABLE)
/****************************************************************************
* 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
/* 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
/* We can't support encoding of special characters of unless the Keyboard
* CODEC is enabled.
*/
#ifndef CONFIG_LIBC_KBDCODEC
# undef CONFIG_HIDKBD_ENCODED
#endif
/* If we are using raw scancodes, then we cannot support encoding of
* special characters either.
*/
#ifdef CONFIG_HIDKBD_RAWSCANCODES
# undef CONFIG_HIDKBD_ENCODED
#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
/* Debug ********************************************************************/
/* Both CONFIG_DEBUG_INPUT and CONFIG_DEBUG_USB could apply to this file.
* We assume here that CONFIG_DEBUG_INPUT might be enabled separately, but
* CONFIG_DEBUG_USB implies both.
*/
#ifndef CONFIG_DEBUG_INPUT
# undef ierr
# define ierr uerr
# undef iinfo
# define iinfo uinfo
#endif
/****************************************************************************
* 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 usbclass;
/* The remainder of the fields are provided to 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 */
mutex_t lock; /* 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 Interrupt 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'.
*/
FAR struct pollfd *fds[CONFIG_HIDKBD_NPOLLWAITERS];
/* 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];
FAR uint8_t *ctrlreq; /* Allocated ctrl request structure */
size_t ctrllen; /* Size of the allocated control buffer */
bool caps_lock; /* Private caps lock status */
bool sync_led; /* For LED update */
bool empty; /* Keep track of data availability */
sem_t syncsem; /* Semaphore to wait for a poll thread */
#ifdef CONFIG_HIDKBD_NOGETREPORT
struct work_s rwork; /* For interrupt transfer work */
int16_t nbytes; /* # of bytes actually transferred */
#endif
#ifndef CONFIG_HIDKBD_NODEBOUNCE
uint8_t lastkey[6]; /* For debouncing */
#endif
};
/* This type is used for encoding special characters */
#ifdef CONFIG_HIDKBD_ENCODED
struct usbhost_outstream_s
{
struct lib_outstream_s stream;
FAR struct usbhost_state_s *priv;
};
#endif
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Memory allocation services */
static inline FAR struct usbhost_state_s *usbhost_allocclass(void);
static inline void usbhost_freeclass(FAR struct usbhost_state_s *usbclass);
/* 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,
FAR char *devname);
/* Keyboard polling thread */
static void usbhost_destroy(FAR void *arg);
static void usbhost_putbuffer(FAR struct usbhost_state_s *priv,
uint8_t keycode);
#ifdef CONFIG_HIDKBD_ENCODED
static void usbhost_putstream(FAR struct lib_outstream_s *self, int ch);
#endif
static inline uint8_t usbhost_mapscancode(uint8_t scancode,
uint8_t modifier);
#ifdef CONFIG_HIDKBD_ENCODED
static inline void usbhost_encodescancode(FAR struct usbhost_state_s *priv,
uint8_t scancode,
uint8_t modifier);
#endif
static int usbhost_kbdpoll(int argc, FAR char *argv[]);
#ifdef CONFIG_HIDKBD_NOGETREPORT
static void usbhost_kbd_work(FAR void *arg);
static void usbhost_kbd_callback(FAR void *arg, ssize_t nbytes);
#endif
static int usbhost_extract_keys(FAR struct usbhost_state_s *priv);
static int usbhost_send_request(FAR struct usbhost_state_s *priv,
uint8_t dir, uint8_t req, uint16_t value,
uint16_t index, uint16_t len,
FAR uint8_t *data);
static inline bool usbhost_get_capslock(void);
static inline void usbhost_toggle_capslock(void);
/* Helpers for usbhost_connect() */
static inline int usbhost_cfgdesc(FAR struct usbhost_state_s *priv,
FAR const uint8_t *configdesc,
int desclen);
static inline int usbhost_devinit(FAR struct usbhost_state_s *priv);
/* (Little Endian) Data helpers */
static inline uint16_t usbhost_getle16(FAR const uint8_t *val);
static inline void usbhost_putle16(FAR uint8_t *dest, uint16_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);
/* Control request memory management */
static int usbhost_cralloc(FAR struct usbhost_state_s *priv);
static int usbhost_crfree(FAR struct usbhost_state_s *priv);
/* struct usbhost_registry_s methods */
static FAR struct usbhost_class_s *
usbhost_create(FAR struct usbhost_hubport_s *hport,
FAR const struct usbhost_id_s *id);
/* struct usbhost_class_s methods */
static int usbhost_connect(FAR struct usbhost_class_s *usbclass,
FAR const uint8_t *configdesc, int desclen);
static int usbhost_disconnected(FAR struct usbhost_class_s *usbclass);
/* 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);
static int usbhost_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup);
/****************************************************************************
* Private Data
****************************************************************************/
/* This structure provides the registry entry ID information that will be
* used to associate the USB host keyboard class driver to a connected USB
* device.
*/
static const struct usbhost_id_s g_hidkbd_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_hidkbd =
{
NULL, /* flink */
usbhost_create, /* create */
1, /* nids */
&g_hidkbd_id /* id[] */
};
static const struct file_operations g_hidkbd_fops =
{
usbhost_open, /* open */
usbhost_close, /* close */
usbhost_read, /* read */
usbhost_write, /* write */
NULL, /* seek */
NULL, /* ioctl */
NULL, /* mmap */
NULL, /* truncate */
usbhost_poll /* poll */
};
/* 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 mutex_t g_lock = NXMUTEX_INITIALIZER;
static FAR struct usbhost_state_s *g_priv;
/* Global caps lock status */
static bool g_caps_lock = false;
/* The following tables map keyboard scan codes to printable ASCII
* characters. There is no support here for function keys or cursor
* controls.
*/
#ifndef CONFIG_HIDKBD_RAWSCANCODES
#ifdef CONFIG_HIDKBD_ENCODED
/* The first and last scancode values with encode-able values */
#define FIRST_ENCODING USBHID_KBDUSE_ENTER /* 0x28 Keyboard Return (ENTER) */
#ifndef CONFIG_HIDKBD_ALLSCANCODES
# define LAST_ENCODING USBHID_KBDUSE_POWER /* 0x66 Keyboard Power */
#else
# define LAST_ENCODING USBHID_KBDUSE_KPDHEXADECIMAL /* 0xdd Keypad Hexadecimal */
#endif
#define USBHID_NUMENCODINGS (LAST_ENCODING - FIRST_ENCODING + 1)
static const uint8_t encoding[USBHID_NUMENCODINGS] =
{
/* 0x28-0x2f: Enter,escape,del,back-tab,space,_,+,{ */
KEYCODE_ENTER, 0,
KEYCODE_FWDDEL, KEYCODE_BACKDEL,
0, 0,
0, 0,
/* 0x30-0x37: },|,Non-US tilde,:,",grave tilde,<,> */
0, 0,
0, 0,
0, 0,
0, 0,
/* 0x38-0x3f: /,CapsLock,F1,F2,F3,F4,F5,F6 */
0, KEYCODE_CAPSLOCK,
KEYCODE_F1, KEYCODE_F2,
KEYCODE_F3, KEYCODE_F4,
KEYCODE_F5, KEYCODE_F6,
/* 0x40-0x47: F7,F8,F9,F10,F11,F12,PrtScn,ScrollLock */
KEYCODE_F7, KEYCODE_F8,
KEYCODE_F9, KEYCODE_F10,
KEYCODE_F11, KEYCODE_F12,
KEYCODE_PRTSCRN, KEYCODE_SCROLLLOCK,
/* 0x48-0x4f: Pause,Insert,Home,PageUp,
* DeleteForward,End,PageDown,RightArrow
*/
KEYCODE_PAUSE, KEYCODE_INSERT,
KEYCODE_HOME, KEYCODE_PAGEUP,
KEYCODE_FWDDEL, KEYCODE_END,
KEYCODE_PAGEDOWN, KEYCODE_RIGHT,
/* 0x50-0x57: LeftArrow,DownArrow,UpArrow,Num Lock,/,*,-,+ */
KEYCODE_LEFT, KEYCODE_DOWN,
KEYCODE_UP, KEYCODE_NUMLOCK,
0, 0,
0, 0,
/* 0x58-0x5f: Enter,1-7 */
KEYCODE_ENTER, 0,
0, 0,
0, 0,
0, 0,
/* 0x60-0x66: 8-9,0,.,Non-US \,Application,Power */
0, 0,
0, 0,
0, 0,
KEYCODE_POWER,
#ifdef CONFIG_HIDKBD_ALLSCANCODES
0, /* 0x67 = */
/* 0x68-0x6f: F13,F14,F15,F16,F17,F18,F19,F20 */
KEYCODE_F13, KEYCODE_F14,
KEYCODE_F15, KEYCODE_F16,
KEYCODE_F17, KEYCODE_F18,
KEYCODE_F19, KEYCODE_F20,
/* 0x70-0x77: F21,F22,F23,F24,Execute,Help,Menu,Select */
KEYCODE_F21, KEYCODE_F22,
KEYCODE_F23, KEYCODE_F24,
KEYCODE_EXECUTE, KEYCODE_HELP,
KEYCODE_MENU, KEYCODE_SELECT,
/* 0x78-0x7f: Stop,Again,Undo,Cut,Copy,Paste,Find,Mute */
KEYCODE_STOP, KEYCODE_AGAIN,
KEYCODE_UNDO, KEYCODE_CUT,
KEYCODE_COPY, KEYCODE_PASTE,
KEYCODE_FIND, KEYCODE_MUTE,
/* 0x80-0x87: VolUp,VolDown,LCapsLock,lNumLock,LScrollLock,,,
* =,International1
*/
KEYCODE_VOLUP, KEYCODE_VOLDOWN,
KEYCODE_LCAPSLOCK, KEYCODE_LNUMLOCK,
KEYCODE_LSCROLLLOCK, 0,
0, 0,
/* 0x88-0x8f: International 2-9 */
0, 0,
0, 0,
0, 0,
0, 0,
/* 0x90-0x97: LAN 1-8 */
KEYCODE_LANG1, KEYCODE_LANG2,
KEYCODE_LANG3, KEYCODE_LANG4,
KEYCODE_LANG5, KEYCODE_LANG6,
KEYCODE_LANG7, KEYCODE_LANG8,
/* 0x98-0x9f: LAN 9,Erase,SysReq,Cancel,Clear,Prior,Return,Separator */
0, 0,
KEYCODE_SYSREQ, KEYCODE_CANCEL,
KEYCODE_CLEAR, 0,
KEYCODE_ENTER, 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,
0, 0,
/* 0xb0-0xb7: 00,000,ThouSeparator,DecSeparator,CurrencyUnit,SubUnit,(,) */
0, 0,
0, 0,
0, 0,
0, 0,
/* 0xb8-0xbf: {,},tab,backspace,A-D */
0, 0,
0, KEYCODE_BACKDEL,
0, 0,
0, 0,
/* 0xc0-0xc7: E-F,XOR,^,%,<,>,& */
0, 0,
0, 0,
0, 0,
0, 0,
/* 0xc8-0xcf: &&,|,||,:,#, ,@,! */
0, 0,
0, 0,
0, 0,
0, 0,
/* 0xd0-0xd7: Memory Store,Recall,Clear,Add,Subtract,Multiply,Divide,+/- */
KEYCODE_MEMSTORE, KEYCODE_MEMRECALL,
KEYCODE_MEMCLEAR, KEYCODE_MEMADD,
KEYCODE_MEMSUB, KEYCODE_MEMMUL,
KEYCODE_MEMDIV, KEYCODE_NEGATE,
/* 0xd8-0xdd: Clear,ClearEntry,Binary,Octal,Decimal,Hexadecimal */
KEYCODE_CLEAR, KEYCODE_CLEARENTRY,
KEYCODE_BINARY, KEYCODE_OCTAL,
KEYCODE_DECIMAL, KEYCODE_HEXADECIMAL
#endif
};
#endif
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, ':', '"', '~', '<', '>', /* 0x30-0x37: },|,Non-US tilde,:,",grave tilde,<,> */
'?', 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', '5', '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,Erase,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,Multiply,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', ';', '\'', '`', ',', '.', /* 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', '5', '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,Erase,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,Multiply,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_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 Value:
* 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 *)
kmm_malloc(sizeof(struct usbhost_state_s));
uinfo("Allocated: %p\n", priv);
return priv;
}
/****************************************************************************
* Name: usbhost_freeclass
*
* Description:
* Free a class instance previously allocated by usbhost_allocclass().
*
* Input Parameters:
* usbclass - A reference to the class instance to be freed.
*
* Returned Value:
* None
*
****************************************************************************/
static inline void usbhost_freeclass(FAR struct usbhost_state_s *usbclass)
{
DEBUGASSERT(usbclass != NULL);
/* Free the class instance. */
uinfo("Freeing: %p\n", usbclass);
kmm_free(usbclass);
}
/****************************************************************************
* 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 = enter_critical_section();
for (devno = 0; devno < 26; devno++)
{
uint32_t bitno = 1 << devno;
if ((g_devinuse & bitno) == 0)
{
g_devinuse |= bitno;
priv->devchar = 'a' + devno;
leave_critical_section(flags);
return OK;
}
}
leave_critical_section(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 = enter_critical_section();
g_devinuse &= ~(1 << devno);
leave_critical_section(flags);
}
}
static inline void usbhost_mkdevname(FAR struct usbhost_state_s *priv,
FAR char *devname)
{
snprintf(devname, DEV_NAMELEN, DEV_FORMAT, priv->devchar);
}
/****************************************************************************
* Name: usbhost_destroy
*
* Description:
* The USB device has been disconnected and the reference 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 Value:
* None
*
****************************************************************************/
static void usbhost_destroy(FAR void *arg)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)arg;
FAR struct usbhost_hubport_s *hport;
char devname[DEV_NAMELEN];
DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL);
hport = priv->usbclass.hport;
uinfo("crefs: %d\n", priv->crefs);
/* Unregister the driver */
uinfo("Unregister driver\n");
usbhost_mkdevname(priv, devname);
unregister_driver(devname);
/* Release the device name used by this connection */
usbhost_freedevno(priv);
/* Free the interrupt endpoints */
if (priv->epin)
{
DRVR_EPFREE(hport->drvr, priv->epin);
}
if (priv->epout)
{
DRVR_EPFREE(hport->drvr, priv->epout);
}
/* Free any transfer buffers */
usbhost_tdfree(priv);
/* Free any control request buffers */
usbhost_crfree(priv);
/* Destroy the mutex & semaphores */
nxmutex_destroy(&priv->lock);
nxsem_destroy(&priv->waitsem);
/* Disconnect the USB host device */
DRVR_DISCONNECT(hport->drvr, hport);
/* Free the function address assigned to this device */
usbhost_devaddr_destroy(hport, hport->funcaddr);
hport->funcaddr = 0;
/* And free the class instance. */
usbhost_freeclass(priv);
}
/****************************************************************************
* Name: usbhost_putbuffer
*
* Description:
* Add one character to the user buffer.
*
* Input Parameters:
* priv - Driver internal state
* keycode - The value to add to the user buffer
*
* Returned Value:
* None
*
****************************************************************************/
static void usbhost_putbuffer(FAR struct usbhost_state_s *priv,
uint8_t keycode)
{
register unsigned int head;
register unsigned int tail;
/* Copy the next keyboard character into the user buffer. */
head = priv->headndx;
priv->kbdbuffer[head] = keycode;
/* 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?
*/
tail = priv->tailndx;
if (tail == head)
{
if (++tail >= CONFIG_HIDKBD_BUFSIZE)
{
tail = 0;
}
/* Save the updated tail index */
priv->tailndx = tail;
}
/* Save the updated head index */
priv->headndx = head;
}
/****************************************************************************
* Name: usbhost_putstream
*
* Description:
* A wrapper for usbhost_putc that is compatible with the lib_outstream_s
* putc methods.
*
* Input Parameters:
* stream - The struct lib_outstream_s reference
* ch - The character to add to the user buffer
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_HIDKBD_ENCODED
static void usbhost_putstream(FAR struct lib_outstream_s *stream, int ch)
{
FAR struct usbhost_outstream_s *privstream =
(FAR struct usbhost_outstream_s *)stream;
DEBUGASSERT(privstream && privstream->priv);
usbhost_putbuffer(privstream->priv, (uint8_t)ch);
stream->nput++;
}
#endif
/****************************************************************************
* 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 Value:
* None
*
****************************************************************************/
static inline uint8_t usbhost_mapscancode(uint8_t scancode, uint8_t modifier)
{
if (usbhost_get_capslock())
{
modifier |= (USBHID_MODIFER_LSHIFT | USBHID_MODIFER_RSHIFT);
}
#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_encodescancode
*
* Description:
* Check if the key has a special function encoding and, if it does, add
* the encoded value to the user buffer.
*
* Input Parameters:
* priv - Driver internal state
* scancode - Scan code to be mapped.
* modifier - Ctrl, Alt, Shift, GUI modifier bits
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_HIDKBD_ENCODED
static inline void usbhost_encodescancode(FAR struct usbhost_state_s *priv,
uint8_t scancode, uint8_t modifier)
{
uint8_t encoded;
/* Check if the raw scancode is in a valid range */
if (scancode >= FIRST_ENCODING && scancode <= LAST_ENCODING)
{
/* Yes the value is within range */
encoded = encoding[scancode - FIRST_ENCODING];
iinfo(" scancode: %02x modifier: %02x encoded: %d\n",
scancode, modifier, encoded);
if (encoded)
{
struct usbhost_outstream_s usbstream;
/* And it does correspond to a special function key */
usbstream.stream.putc = usbhost_putstream;
usbstream.stream.nput = 0;
usbstream.priv = priv;
/* Add the special function value to the user buffer */
kbd_specpress((enum kbd_keycode_e)encoded,
(FAR struct lib_outstream_s *)&usbstream);
}
}
}
#endif
/****************************************************************************
* Name: usbhost_get_capslock
*
* Description:
* Get the global value of caps lock.
*
* Input Parameters:
* None
*
* Returned Value:
* The value of g_caps_lock
*
****************************************************************************/
static inline bool usbhost_get_capslock(void)
{
irqstate_t flags;
bool retval;
flags = enter_critical_section();
retval = g_caps_lock;
leave_critical_section(flags);
return retval;
}
/****************************************************************************
* Name: usbhost_toggle_capslock
*
* Description:
* Toggle g_caps_lock.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
static inline void usbhost_toggle_capslock(void)
{
irqstate_t flags;
flags = enter_critical_section();
g_caps_lock = !g_caps_lock;
leave_critical_section(flags);
}
/****************************************************************************
* Name: usbhost_extract_keys
*
* Description:
* Check if the key has a special function encoding and, if it does, add
* the encoded value to the user buffer.
*
* Input Parameters:
* priv - Driver internal state
* scancode - Scan code to be mapped.
* modifier - Ctrl, Alt, Shift, GUI modifier bits
*
* Returned Value:
* None
*
****************************************************************************/
static int usbhost_extract_keys(FAR struct usbhost_state_s *priv)
{
struct usbhid_kbdreport_s *rpt =
(struct usbhid_kbdreport_s *)priv->tbuffer;
uint8_t keycode;
int i;
int ret;
bool newstate;
/* Add the newly received keystrokes to our internal buffer */
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
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] != priv->lastkey[0]
&& rpt->key[i] != priv->lastkey[1]
&& rpt->key[i] != priv->lastkey[2]
&& rpt->key[i] != priv->lastkey[3]
&& rpt->key[i] != priv->lastkey[4]
&& rpt->key[i] != priv->lastkey[5]
#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.
*/
keycode = usbhost_mapscancode(rpt->key[i], rpt->modifier);
iinfo("Key %d: %02x keycode:%c modifier: %02x\n",
i, rpt->key[i], keycode ? keycode : ' ',
rpt->modifier);
if (rpt->key[i] == 57)
{
usbhost_toggle_capslock();
}
/* Zero at this point means that the key does not map to a
* printable character.
*/
if (keycode != 0)
{
/* Handle control characters. Zero after this means
* a valid, NUL character.
*/
if ((rpt->modifier & (USBHID_MODIFER_LCTRL |
USBHID_MODIFER_RCTRL)) != 0)
{
keycode &= 0x1f;
}
/* Copy the next keyboard character into the user
* buffer.
*/
usbhost_putbuffer(priv, keycode);
}
/* The zero might, however, map to a special keyboard
* action (such as a cursor movement or function key).
* Attempt to encode the special key.
*/
#ifdef CONFIG_HIDKBD_ENCODED
else
{
usbhost_encodescancode(priv, rpt->key[i],
rpt->modifier);
}
#endif
}
/* Save the scancode (or lack thereof) for key debouncing on
* next keyboard report.
*/
#ifndef CONFIG_HIDKBD_NODEBOUNCE
priv->lastkey[i] = rpt->key[i];
#endif
}
/* Is there data available? */
newstate = (priv->headndx == priv->tailndx);
if (!newstate)
{
/* Did we just transition from no data available to data
* available? If so, wake up any threads waiting for the
* POLLIN event.
*/
if (priv->empty)
{
poll_notify(priv->fds, CONFIG_HIDKBD_NPOLLWAITERS, POLLIN);
}
/* Yes.. Is there a thread waiting for keyboard data now? */
if (priv->waiting)
{
/* Yes.. wake it up */
nxsem_post(&priv->waitsem);
priv->waiting = false;
}
}
priv->empty = newstate;
nxmutex_unlock(&priv->lock);
return 0;
}
/****************************************************************************
* Name: usbhost_kbd_work
*
* Description:
* Handle receipt of an asynchronous notification from the HID device
*
* Input Parameters:
* arg - The argument provided when the asynchronous I/O was setup
*
* Returned Value:
* None
*
* Assumptions:
* Probably called from an interrupt handler.
*
****************************************************************************/
#ifdef CONFIG_HIDKBD_NOGETREPORT
static void usbhost_kbd_work(FAR void *arg)
{
FAR struct usbhost_state_s *priv;
FAR struct usbhost_hubport_s *hport;
int ret;
priv = (FAR struct usbhost_state_s *)arg;
DEBUGASSERT(priv);
hport = priv->usbclass.hport;
DEBUGASSERT(hport);
/* Are we still connected? */
if (!priv->disconnected && priv->epin)
{
/* Yes.. Was an interrupt IN message received correctly? */
if (priv->open && priv->nbytes >= 0)
{
/* Add the newly received keystrokes to our internal buffer */
usbhost_extract_keys(priv);
/* No bytes left to process */
priv->nbytes = 0;
}
/* Is the caps lock status in sync? */
if (priv->caps_lock != usbhost_get_capslock())
{
/* No.. The LED needs to be changed by the polling thread. */
priv->sync_led = true;
}
else
{
/* Setup to receive the next report */
ret = DRVR_ASYNCH(hport->drvr, priv->epin,
(FAR uint8_t *)priv->tbuffer,
sizeof(struct usbhid_kbdreport_s),
usbhost_kbd_callback,
priv);
if (ret < 0)
{
uerr("ERROR: DRVR_ASYNCH failed: %d\n", ret);
}
}
}
}
/****************************************************************************
* Name: usbhost_kbd_callback
*
* Description:
* Handle receipt of data
*
* Input Parameters:
* arg - The argument provided when the asynchronous I/O was setup
* nbytes - The number of bytes actually transferred (or a negated errno
* value;
*
* Returned Value:
* None
*
* Assumptions:
* Probably called from an interrupt handler.
*
****************************************************************************/
static void usbhost_kbd_callback(FAR void *arg, ssize_t nbytes)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)arg;
DEBUGASSERT(priv);
/* Are we still connected? */
if (!priv->disconnected)
{
DEBUGASSERT(nbytes >= INT16_MIN && nbytes <= INT16_MAX);
/* Save nbytes */
priv->nbytes = (int16_t)nbytes;
if (work_available(&priv->rwork))
{
work_queue(HPWORK, &priv->rwork, usbhost_kbd_work, priv, 0);
}
}
}
#endif
/****************************************************************************
* Name: usbhost_kbdpoll
*
* Description:
* Periodically check for new keyboard data.
*
* Input Parameters:
* arg - A reference to the class instance to be destroyed.
*
* Returned Value:
* None
*
****************************************************************************/
static int usbhost_kbdpoll(int argc, FAR char *argv[])
{
FAR struct usbhost_state_s *priv;
irqstate_t flags;
#if defined(CONFIG_DEBUG_USB) && defined(CONFIG_DEBUG_INFO)
unsigned int npolls = 0;
#endif
unsigned int nerrors = 0;
useconds_t delay;
int ret;
uint8_t leds;
uinfo("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 *not* incremented here. When the
* driver structure was created, it was created with a reference count of
* one. This thread is responsible for that count. The count will be
* decrement when this thread exits.
*/
priv = g_priv;
DEBUGASSERT(priv != NULL && priv->usbclass.hport);
priv->polling = true;
nxsem_post(&priv->syncsem);
nxsig_sleep(1);
/* Loop here until the device is disconnected */
uinfo("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.
*/
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* Keep the Caps Lock LED in sync */
if (priv->sync_led)
{
priv->sync_led = false;
priv->caps_lock = usbhost_get_capslock();
leds = usbhost_get_capslock() ? USBHID_KBDOUT_CAPSLOCK : 0x00;
*priv->tbuffer = leds;
/* Send a report request to change the LED */
usbhost_send_request(priv, USB_REQ_DIR_OUT,
USBHID_REQUEST_SETREPORT,
USBHID_REPORTTYPE_OUTPUT << 8, 0, 1,
priv->tbuffer);
#ifdef CONFIG_HIDKBD_NOGETREPORT
/* Setup to receive the next report */
if (work_available(&priv->rwork))
{
work_queue(HPWORK, &priv->rwork, usbhost_kbd_work, priv, 0);
}
#endif
}
#ifdef CONFIG_HIDKBD_NOGETREPORT
nxmutex_unlock(&priv->lock);
#else
/* Send HID report request */
ret = usbhost_send_request(priv, USB_REQ_DIR_IN,
USBHID_REQUEST_GETREPORT,
USBHID_REPORTTYPE_INPUT << 8,
priv->ifno,
sizeof(struct usbhid_kbdreport_s),
priv->tbuffer);
nxmutex_unlock(&priv->lock);
/* Check for errors -- Bail if an excessive number of consecutive
* errors are encountered.
*/
if (ret < 0)
{
nerrors++;
uerr("ERROR: GETREPORT/INPUT, DRVR_CTRLIN returned: %d/%d\n",
ret, nerrors);
if (nerrors > 200)
{
uerr(" 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)
{
/* Success, reset the error counter */
nerrors = 0;
/* Add the newly received keystrokes to our internal buffer */
ret = usbhost_extract_keys(priv);
if (ret < 0)
{
return ret;
}
/* Make sure the LED is in sync */
if (priv->caps_lock != usbhost_get_capslock())
{
priv->sync_led = true;
}
}
#endif
/* If USB debug is on, then provide some periodic indication that
* polling is still happening.
*/
#if defined(CONFIG_DEBUG_USB) && defined(CONFIG_DEBUG_INFO)
npolls++;
if ((npolls & 31) == 0)
{
uinfo("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.
*
* If we are getting errors, then sleep longer. In the event that
* the keyboard is connected via a hub, there may be a significant
* amount of time after the keyboard is removed before we are stopped.
*/
if (nerrors > 1)
{
delay = nerrors * CONFIG_HIDKBD_POLLUSEC;
}
else
{
delay = CONFIG_HIDKBD_POLLUSEC;
}
nxsig_usleep(delay);
}
/* 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.
*/
nxmutex_lock(&priv->lock);
/* Indicate that we are no longer running and decrement the reference
* count held 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.
*/
uinfo("Keyboard removed, polling halted\n");
flags = enter_critical_section();
priv->polling = false;
/* Decrement the reference count held by this thread. */
DEBUGASSERT(priv->crefs > 0);
priv->crefs--;
/* There are two possibilities:
* 1) The reference count is greater than zero. This means that there
* are still open references to the keyboard driver. In this case
* we need to wait until usbhost_close() is called and all of the
* open driver references are decremented. Then usbhost_destroy() can
* be called from usbhost_close().
* 2) The reference count is now zero. This means that there are no
* further open references and we can call usbhost_destroy() now.
*/
if (priv->crefs < 1)
{
/* Unregister the driver and destroy the instance (while we hold
* the mutex!)
*/
usbhost_destroy(priv);
}
else
{
/* No, we will destroy the driver instance when its final open
* reference is closed
*/
nxmutex_unlock(&priv->lock);
}
leave_critical_section(flags);
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
* descriptor.
* desclen - The length in bytes of the configuration descriptor.
*
* Returned Value:
* 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)
{
FAR struct usbhost_hubport_s *hport;
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 && priv->usbclass.hport != NULL &&
configdesc != NULL && desclen >= sizeof(struct usb_cfgdesc_s));
hport = priv->usbclass.hport;
/* Keep the compiler from complaining about uninitialized variables */
memset(&epindesc, 0, sizeof(struct usbhost_epdesc_s));
memset(&epoutdesc, 0, sizeof(struct usbhost_epdesc_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 descriptors 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;
uinfo("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:
uinfo("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;
uinfo("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.hport = hport;
epoutdesc.addr = epdesc->addr &
USB_EP_ADDR_NUMBER_MASK;
epoutdesc.in = false;
epoutdesc.xfrtype = USB_EP_ATTR_XFER_INT;
epoutdesc.interval = epdesc->interval;
epoutdesc.mxpacketsize =
usbhost_getle16(epdesc->mxpacketsize);
uinfo("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 endpoint. We don't know what
* to do with this.
*/
return -EINVAL;
}
found |= USBHOST_EPINFOUND;
/* Save the interrupt IN endpoint information */
epindesc.hport = hport;
epindesc.addr = epdesc->addr &
USB_EP_ADDR_NUMBER_MASK;
epindesc.in = 1;
epindesc.xfrtype = USB_EP_ATTR_XFER_INT;
epindesc.interval = epdesc->interval;
epindesc.mxpacketsize =
usbhost_getle16(epdesc->mxpacketsize);
uinfo("Interrupt IN EP addr:%d mxpacketsize:%d\n",
epindesc.addr, epindesc.mxpacketsize);
}
}
}
break;
/* Other descriptors are just ignored for now */
default:
uinfo("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)
{
uerr("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(hport->drvr, &epindesc, &priv->epin);
if (ret < 0)
{
uerr("ERROR: Failed to allocate interrupt IN endpoint\n");
return ret;
}
/* Then the optional interrupt OUT endpoint */
uinfo("Found EPOOUT:%s\n",
(found & USBHOST_EPOUTFOUND) != 0 ? "YES" : "NO");
if ((found & USBHOST_EPOUTFOUND) != 0)
{
ret = DRVR_EPALLOC(hport->drvr, &epoutdesc, &priv->epout);
if (ret < 0)
{
uerr("ERROR: Failed to allocate interrupt OUT endpoint\n");
DRVR_EPFREE(hport->drvr, priv->epin);
return ret;
}
}
uinfo("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 Value:
* None
*
****************************************************************************/
static inline int usbhost_devinit(FAR struct usbhost_state_s *priv)
{
char devname[DEV_NAMELEN];
int ret;
uint8_t leds;
#ifdef CONFIG_HIDKBD_NOGETREPORT
FAR struct usbhost_hubport_s *hport;
hport = priv->usbclass.hport;
#endif
/* Set aside a transfer buffer for exclusive
* use by the keyboard class driver
*/
ret = usbhost_tdalloc(priv);
if (ret < 0)
{
uerr("ERROR: Failed to allocate transfer buffer\n");
return ret;
}
/* Allocate memory for control requests */
ret = usbhost_cralloc(priv);
if (ret < 0)
{
uerr("ERROR: Failed to allocate control buffer\n");
return ret;
}
/* Set the idle rate */
usbhost_send_request(priv, USB_REQ_DIR_OUT, USBHID_REQUEST_SETIDLE,
25 << 8, priv->ifno, 0, NULL);
/* Choose the boot protocol */
usbhost_send_request(priv, USB_REQ_DIR_OUT, USBHID_REQUEST_SETPROTOCOL,
0, 0, 0, NULL);
/* Initialize the Caps Lock LED */
priv->caps_lock = usbhost_get_capslock();
leds = usbhost_get_capslock() ? USBHID_KBDOUT_CAPSLOCK : 0x00;
*priv->tbuffer = leds;
usbhost_send_request(priv, USB_REQ_DIR_OUT, USBHID_REQUEST_SETREPORT,
USBHID_REPORTTYPE_OUTPUT << 8, 0, 1,
priv->tbuffer);
#ifdef CONFIG_HIDKBD_NOGETREPORT
/* Do we have an interrupt IN endpoint? */
if (priv->epin)
{
/* Use interrupt tranfers to get reports. */
uinfo("Start waiting for key reports\n");
ret = DRVR_ASYNCH(hport->drvr, priv->epin,
(FAR uint8_t *)priv->tbuffer,
sizeof(struct usbhid_kbdreport_s),
usbhost_kbd_callback,
priv);
if (ret < 0)
{
uerr("ERROR: DRVR_ASYNCH failed: %d\n", ret);
}
}
#endif
/* 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 use
* 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).
*/
uinfo("Start poll task\n");
/* The inputs to a task started by kthread_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).
*/
ret = nxmutex_lock(&g_lock);
if (ret < 0)
{
usbhost_tdfree(priv);
goto errout;
}
g_priv = priv;
ret = kthread_create("kbdpoll", CONFIG_HIDKBD_DEFPRIO,
CONFIG_HIDKBD_STACKSIZE, usbhost_kbdpoll, NULL);
if (ret < 0)
{
/* Failed to started the poll thread...
* probably due to memory resources
*/
nxmutex_unlock(&g_lock);
goto errout;
}
priv->pollpid = (pid_t)ret;
/* Now wait for the poll task to get properly initialized */
ret = nxsem_wait_uninterruptible(&priv->syncsem);
nxmutex_unlock(&g_lock);
if (ret < 0)
{
goto errout;
}
/* Register the driver */
uinfo("Register driver\n");
usbhost_mkdevname(priv, devname);
ret = register_driver(devname, &g_hidkbd_fops, 0666, priv);
/* We now have to be concerned about asynchronous modification of crefs
* because the driver has been registered.
*/
errout:
nxmutex_lock(&priv->lock);
priv->crefs--;
nxmutex_unlock(&priv->lock);
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 Value:
* A uint16_t representing the whole 16-bit integer value
*
****************************************************************************/
static inline uint16_t usbhost_getle16(FAR 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 Value:
* None
*
****************************************************************************/
static void usbhost_putle16(FAR 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_tdalloc
*
* Description:
* Allocate transfer buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Value:
* On success, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static int usbhost_tdalloc(FAR struct usbhost_state_s *priv)
{
FAR struct usbhost_hubport_s *hport;
DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL &&
priv->tbuffer == NULL);
hport = priv->usbclass.hport;
return DRVR_ALLOC(hport->drvr, &priv->tbuffer, &priv->tbuflen);
}
/****************************************************************************
* Name: usbhost_tdfree
*
* Description:
* Free transfer buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Value:
* On success, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static int usbhost_tdfree(FAR struct usbhost_state_s *priv)
{
FAR struct usbhost_hubport_s *hport;
int result = OK;
DEBUGASSERT(priv);
if (priv->tbuffer)
{
DEBUGASSERT(priv->usbclass.hport);
hport = priv->usbclass.hport;
result = DRVR_FREE(hport->drvr, priv->tbuffer);
priv->tbuffer = NULL;
priv->tbuflen = 0;
}
return result;
}
/****************************************************************************
* Name: usbhost_cralloc
*
* Description:
* Allocate control request buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Value:
* On success, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static int usbhost_cralloc(FAR struct usbhost_state_s *priv)
{
FAR struct usbhost_hubport_s *hport;
DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL &&
priv->ctrlreq == NULL);
hport = priv->usbclass.hport;
return DRVR_ALLOC(hport->drvr, &priv->ctrlreq, &priv->ctrllen);
}
/****************************************************************************
* Name: usbhost_crfree
*
* Description:
* Free control request buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Value:
* On success, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static int usbhost_crfree(FAR struct usbhost_state_s *priv)
{
FAR struct usbhost_hubport_s *hport;
int result = OK;
DEBUGASSERT(priv);
if (priv->ctrlreq)
{
DEBUGASSERT(priv->usbclass.hport);
hport = priv->usbclass.hport;
result = DRVR_FREE(hport->drvr, priv->ctrlreq);
priv->ctrlreq = NULL;
priv->ctrllen = 0;
}
return result;
}
/****************************************************************************
* Name: usbhost_send_request
*
* Description:
* Send a request.
*
* Input Parameters:
* priv - A reference to the class instance.
* dir - USB_REQ_DIR_IN or USB_REQ_DIR_OUT
* req - request identifier
* value - request value
* index - request index
* len - request length
*
* Returned Value:
* On success, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static int usbhost_send_request(FAR struct usbhost_state_s *priv,
uint8_t dir,
uint8_t req,
uint16_t value,
uint16_t index,
uint16_t len,
FAR uint8_t *data)
{
FAR struct usbhost_hubport_s *hport;
int ret = OK;
FAR struct usb_ctrlreq_s *ctrlreq;
DEBUGASSERT(priv);
hport = priv->usbclass.hport;
/* Initialize the control request */
ctrlreq = (FAR struct usb_ctrlreq_s *)priv->ctrlreq;
ctrlreq->type = dir | USB_REQ_TYPE_CLASS |
USB_REQ_RECIPIENT_INTERFACE;
ctrlreq->req = req;
usbhost_putle16(ctrlreq->value, value);
usbhost_putle16(ctrlreq->index, index);
usbhost_putle16(ctrlreq->len, len);
/* And send the request */
if (dir == USB_REQ_DIR_IN)
{
ret = DRVR_CTRLIN(hport->drvr, hport->ep0, ctrlreq, data);
}
else
{
ret = DRVR_CTRLOUT(hport->drvr, hport->ep0, ctrlreq, data);
}
if (ret < 0)
{
uerr("ERROR: Control request failed: %d\n", ret);
}
return ret;
}
/****************************************************************************
* 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:
* hport - The hub port that manages the new class instance.
* id - In the case where the device supports multiple base classes,
* subclasses, or protocols, this specifies which to configure for.
*
* Returned Value:
* 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 hport 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_hubport_s *hport,
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->usbclass.hport = hport;
priv->usbclass.connect = usbhost_connect;
priv->usbclass.disconnected = usbhost_disconnected;
/* The initial reference count is 1... One reference is held by
* the driver's usbhost_kbdpoll() task.
*/
priv->crefs = 1;
/* Initialize mutex & semaphores */
nxmutex_init(&priv->lock);
nxsem_init(&priv->waitsem, 0, 0);
nxsem_init(&priv->syncsem, 0, 0);
priv->empty = true;
/* Return the instance of the USB keyboard class driver */
return &priv->usbclass;
}
}
/* An error occurred. Free the allocation and return NULL on all failures */
if (priv)
{
usbhost_freeclass(priv);
}
return NULL;
}
/****************************************************************************
* 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:
* usbclass - The USB host class entry previously obtained from a call
* to create().
* configdesc - A pointer to a uint8_t buffer container the configuration
* descriptor.
* desclen - The length in bytes of the configuration descriptor.
*
* Returned Value:
* 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 *usbclass,
FAR const uint8_t *configdesc, int desclen)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)usbclass;
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);
if (ret < 0)
{
uerr("ERROR: usbhost_cfgdesc() failed: %d\n", ret);
}
else
{
/* Now configure the device and register the NuttX driver */
ret = usbhost_devinit(priv);
if (ret < 0)
{
uerr("ERROR: 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 occurred after the kbdpoll task was started successfully. In
* this case, the disconnection 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:
* usbclass - The USB host class entry previously obtained from a call to
* create().
*
* Returned Value:
* 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(FAR struct usbhost_class_s *usbclass)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)usbclass;
DEBUGASSERT(priv != NULL);
/* Set an indication to any users of the keyboard device that the device
* is no longer available.
*/
priv->disconnected = true;
uinfo("Disconnected\n");
/* Is there a thread waiting for keyboard data that will never come? */
if (priv->waiting)
{
/* Yes.. wake it up */
nxsem_post(&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 occurred after the kbdpoll task was started successfully. In
* this case, the disconnection 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.
*/
nxsig_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);
work_queue(HPWORK, &priv->work, usbhost_destroy, priv, 0);
}
return OK;
}
/****************************************************************************
* 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;
uinfo("Entry\n");
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);
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* Check if the keyboard device is still connected. We need to disable
* interrupts momentarily to assure that there are no asynchronous
* disconnect events.
*/
flags = enter_critical_section();
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;
}
leave_critical_section(flags);
nxmutex_unlock(&priv->lock);
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;
irqstate_t flags;
int ret;
uinfo("Entry\n");
inode = filep->f_inode;
priv = inode->i_private;
/* Decrement the reference count on the driver */
DEBUGASSERT(priv->crefs >= 1);
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* We need to disable interrupts momentarily to assure that there are no
* asynchronous poll or disconnect events.
*/
flags = enter_critical_section();
priv->crefs--;
/* Check if the USB mouse device is still connected. If the device is
* no longer connected, then unregister the driver and free the driver
* class instance.
*/
if (priv->disconnected)
{
/* If the reference count is one or less then there are two
* possibilities:
*
* 1) It might be zero meaning that the polling thread has already
* exited and decremented its count.
* 2) If might be one meaning either that (a) the polling thread is
* still running and still holds a count, or (b) the polling thread
* has exited, but there is still an outstanding open reference.
*/
if (priv->crefs == 0 || (priv->crefs == 1 && priv->polling))
{
/* Yes.. In either case, then the driver is no longer open */
priv->open = false;
priv->headndx = 0;
priv->tailndx = 0;
/* Check if the USB keyboard device is still connected. */
if (priv->crefs == 0)
{
/* The polling thread is no longer running */
DEBUGASSERT(!priv->polling);
/* If the device is no longer connected, unregister the driver
* and free the driver class instance.
*/
usbhost_destroy(priv);
/* Skip giving the semaphore... it is no longer valid */
leave_critical_section(flags);
return OK;
}
else /* if (priv->crefs == 1) */
{
/* The polling thread is still running. Signal it so that it
* will wake up and call usbhost_destroy(). The particular
* signal that we use does not matter in this case.
*/
nxsig_kill(priv->pollpid, SIGALRM);
}
}
}
nxmutex_unlock(&priv->lock);
leave_critical_section(flags);
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;
uinfo("Entry\n");
DEBUGASSERT(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);
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* 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 keyboard 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 */
uinfo("Waiting...\n");
priv->waiting = true;
nxmutex_unlock(&priv->lock);
ret = nxsem_wait_uninterruptible(&priv->waitsem);
if (ret < 0)
{
return ret;
}
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* 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 (perhaps marking the buffer empty) */
priv->tailndx = tail;
}
errout:
nxmutex_unlock(&priv->lock);
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.
*
****************************************************************************/
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;
int i;
uinfo("Entry\n");
DEBUGASSERT(fds);
inode = filep->f_inode;
priv = inode->i_private;
/* Make sure that we have exclusive access to the private data structure */
DEBUGASSERT(priv);
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* 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 keyboard 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 available slot 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)
{
poll_notify(&fds, 1, POLLIN);
}
}
else
{
/* This is a request to tear down the poll. */
FAR struct pollfd **slot = (FAR struct pollfd **)fds->priv;
DEBUGASSERT(slot);
/* Remove all memory of the poll setup */
*slot = NULL;
fds->priv = NULL;
}
errout:
nxmutex_unlock(&priv->lock);
return ret;
}
/****************************************************************************
* 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 Value:
* On success this function will return zero (OK); A negated errno value
* will be returned on failure.
*
****************************************************************************/
int usbhost_kbdinit(void)
{
/* Advertise our availability to support (certain) devices */
return usbhost_registerclass(&g_hidkbd);
}
#endif /* CONFIG_USBHOST)&& !CONFIG_USBHOST_INT_DISABLE */
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