/**************************************************************************** * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_HIDKBD_ENCODED # include # include #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 */