/**************************************************************************** * drivers/usbhost/usbhost_hidmouse.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 #ifdef CONFIG_HIDMOUSE_TSCIF # include #else # include #endif /* Don't compile if prerequisites are not met */ #if defined(CONFIG_USBHOST) && !defined(CONFIG_USBHOST_INT_DISABLE) /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Configuration ************************************************************/ /* 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_HIDMOUSE_XMAX # define CONFIG_HIDMOUSE_XMAX 320 #endif #define HIDMOUSE_XMAX_B16 (CONFIG_HIDMOUSE_XMAX << 16) #ifndef CONFIG_HIDMOUSE_YMAX # define CONFIG_HIDMOUSE_YMAX 240 #endif #define HIDMOUSE_YMAX_B16 (CONFIG_HIDMOUSE_YMAX << 16) #ifndef CONFIG_HIDMOUSE_XSCALE # define CONFIG_HIDMOUSE_XSCALE 0x00010000 #endif #ifndef CONFIG_HIDMOUSE_YSCALE # define CONFIG_HIDMOUSE_YSCALE 0x00010000 #endif #ifndef CONFIG_HIDMOUSE_XTHRESH # define CONFIG_HIDMOUSE_XTHRESH 12 #endif #define HIDMOUSE_XTHRESH_B16 (CONFIG_HIDMOUSE_XTHRESH << 16) #ifndef CONFIG_HIDMOUSE_YTHRESH # define CONFIG_HIDMOUSE_YTHRESH 12 #endif #define HIDMOUSE_YTHRESH_B16 (CONFIG_HIDMOUSE_YTHRESH << 16) #ifdef CONFIG_HIDMOUSE_TSCIF # undef CONFIG_INPUT_MOUSE_WHEEL #endif #ifdef CONFIG_INPUT_MOUSE_WHEEL # ifndef CONFIG_HIDMOUSE_WMAX # define CONFIG_HIDMOUSE_WMAX 100 # endif # define HIDMOUSE_WMAX_B16 (CONFIG_HIDMOUSE_WMAX << 16) # ifndef CONFIG_HIDMOUSE_WSCALE # define CONFIG_HIDMOUSE_WSCALE 0x00010000 # endif # ifndef CONFIG_HIDMOUSE_WTHRESH # define CONFIG_HIDMOUSE_WTHRESH 1 # endif # define HIDMOUSE_WTHRESH_B16 (CONFIG_HIDMOUSE_WTHRESH << 16) #endif /* CONFIG_INPUT_MOUSE_WHEEL */ #ifndef CONFIG_HIDMOUSE_DEFPRIO # define CONFIG_HIDMOUSE_DEFPRIO 50 #endif #ifndef CONFIG_HIDMOUSE_STACKSIZE # define CONFIG_HIDMOUSE_STACKSIZE 1024 #endif #ifndef CONFIG_HIDMOUSE_NPOLLWAITERS # define CONFIG_HIDMOUSE_NPOLLWAITERS 2 #endif /* This is a value for the threshold that guarantees a big difference on the * first left button (but can't overflow). */ #define INVALID_POSITION_B16 (0x7fffffff) /* Driver support ***********************************************************/ /* This format is used to construct the /dev/mouse[n] device driver path. It * defined here so that it will be used consistently in all places. */ #ifdef CONFIG_HIDMOUSE_TSCIF # define DEV_FORMAT "/dev/input%d" # define DEV_NAMELEN 14 #else # define DEV_FORMAT "/dev/mouse%d" # define DEV_NAMELEN 14 #endif /* 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_ALLFOUND (USBHOST_IFFOUND|USBHOST_EPINFOUND) #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 ****************************************************************************/ #ifdef CONFIG_HIDMOUSE_TSCIF /* This describes the state of one event */ enum mouse_button_e { BUTTON_NONE = 0, /* No button pressed */ BUTTON_PRESSED, /* Left buffer pressed */ BUTTON_MOVE, /* Same button press, possibly different position */ BUTTON_RELEASED /* Left button released */ }; /* This structure describes the results of one mouse sample. Since this * emulates a touchscreen, only the mouse left button is used. */ struct mouse_sample_s { uint8_t id; /* Sampled touch point ID */ uint8_t event; /* Button state (see enum mouse_button_e) */ bool valid; /* True: x,y contain valid, sampled data */ uint16_t x; /* Measured X position */ uint16_t y; /* Measured Y position */ }; #else /* This structure summarizes the mouse report */ struct mouse_sample_s { uint8_t buttons; /* Button state (see MOUSE_BUTTON_* definitions) */ uint16_t x; /* Accumulated X position */ uint16_t y; /* Accumulated Y position */ #ifdef CONFIG_INPUT_MOUSE_WHEEL uint16_t wheel; /* Reported wheel position */ #endif }; #endif /* This structure contains the internal, private state of the USB host * mouse storage class. */ struct usbhost_state_s { /* This is the externally visible portion of the state */ struct usbhost_class_s usbclass; /* This is an instance of the USB host driver * bound to this class instance */ struct usbhost_driver_s *drvr; /* The remainder of the fields are provide o the mouse class driver */ volatile bool disconnected; /* TRUE: Device has been disconnected */ volatile bool polling; /* TRUE: Poll thread is running */ volatile bool open; /* TRUE: The mouse device is open */ volatile bool valid; /* TRUE: New sample data is available */ uint8_t devno; /* Minor number in the /dev/mouse[n] device */ uint8_t nwaiters; /* Number of threads waiting for mouse data */ #ifdef CONFIG_HIDMOUSE_TSCIF uint8_t id; /* Current "touch" point ID */ #else uint8_t buttons; /* Current state of the mouse buttons */ #endif 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 mouse data */ FAR uint8_t *tbuffer; /* The allocated transfer buffer */ b16_t xaccum; /* Current integrated X position */ b16_t yaccum; /* Current integrated Y position */ b16_t xlast; /* Last reported X position */ b16_t ylast; /* Last reported Y position */ #ifdef CONFIG_INPUT_MOUSE_WHEEL b16_t waccum; /* Current integrated while position */ b16_t wlast; /* Last reported wheel position */ #endif 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 */ struct mouse_sample_s sample; /* Last sampled mouse data */ usbhost_ep_t epin; /* Interrupt IN 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'. */ struct pollfd *fds[CONFIG_HIDMOUSE_NPOLLWAITERS]; }; /**************************************************************************** * 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); /* Mouse polling thread */ static void usbhost_destroy(FAR void *arg); static void usbhost_notify(FAR struct usbhost_state_s *priv); static void usbhost_position(FAR struct usbhost_state_s *priv, FAR struct usbhid_mousereport_s *rpt); #ifdef CONFIG_HIDMOUSE_TSCIF static bool usbhost_touchscreen(FAR struct usbhost_state_s *priv, FAR struct usbhid_mousereport_s *rpt); #endif static bool usbhost_threshold(FAR struct usbhost_state_s *priv); static int usbhost_mouse_poll(int argc, char *argv[]); static int usbhost_sample(FAR struct usbhost_state_s *priv, FAR struct mouse_sample_s *sample); static int usbhost_waitsample(FAR struct usbhost_state_s *priv, FAR struct mouse_sample_s *sample); /* 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(const uint8_t *val); /* Transfer descriptor memory management */ static inline int usbhost_tdalloc(FAR struct usbhost_state_s *priv); static inline int usbhost_tdfree(FAR struct usbhost_state_s *priv); /* struct usbhost_registry_s methods */ static 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 mouse 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 mouse class driver to a connected USB * device. */ static const struct usbhost_id_s g_hidmouse_id = { USB_CLASS_HID, /* base */ USBHID_SUBCLASS_BOOTIF, /* subclass */ USBHID_PROTOCOL_MOUSE, /* proto */ 0, /* vid */ 0 /* pid */ }; /* This is the USB host storage class's registry entry */ static struct usbhost_registry_s g_hidmouse = { NULL, /* flink */ usbhost_create, /* create */ 1, /* nids */ &g_hidmouse_id /* id[] */ }; static const struct file_operations g_hidmouse_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/mouse0-31. */ static uint32_t g_devinuse; /* The following are used to managed the class creation operation */ static mutex_t g_lock = NXMUTEX_INITIALIZER; static sem_t g_syncsem = SEM_INITIALIZER(0); static FAR struct usbhost_state_s *g_priv; /**************************************************************************** * 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->devno = 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 = priv->devno; 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->devno); } /**************************************************************************** * 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); uinfo("crefs: %d\n", priv->crefs); hport = priv->usbclass.hport; /* 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); } /* Free any transfer buffers */ usbhost_tdfree(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_notify * * Description: * Wake any threads waiting for mouse data * * Input Parameters: * priv - A reference to the mouse state structure. * * Returned Value: * None * ****************************************************************************/ static void usbhost_notify(FAR struct usbhost_state_s *priv) { /* If there are threads waiting for read data, then signal one of them * that the read data is available. */ if (priv->nwaiters > 0) { nxsem_post(&priv->waitsem); } /* If there are threads waiting on poll() for mouse data to become * available, then wake them up now. NOTE: we wake up all waiting * threads because we do not know that they are going to do. If they * all try to read the data, then some make end up blocking after all. */ poll_notify(priv->fds, CONFIG_HIDMOUSE_NPOLLWAITERS, POLLIN); } /**************************************************************************** * Name: usbhost_position * * Description: * Integrate the current mouse displacement to get the updated mouse * position. * * Input Parameters: * priv - A reference to the mouse state structure. * rpt - The new mouse report data. * * Returned Value: * None. * ****************************************************************************/ static void usbhost_position(FAR struct usbhost_state_s *priv, FAR struct usbhid_mousereport_s *rpt) { int32_t disp; b16_t pos; /* The following logic performs an constant integration of the mouse X/Y * displacement data in order to keep the X/Y positional data current. */ /* Sign extend the mouse X position. We do this manually because some * architectures do not support signed character types and some compilers * may be configured to treat all characters as unsigned. */ #ifdef CONFIG_HIDMOUSE_SWAPXY disp = rpt->ydisp; if ((rpt->ydisp & 0x80) != 0) { disp |= 0xffffff00; } #else disp = rpt->xdisp; if ((rpt->xdisp & 0x80) != 0) { disp |= 0xffffff00; } #endif /* Scale the X displacement and determine the new X position */ pos = priv->xaccum + CONFIG_HIDMOUSE_XSCALE * disp; /* Make sure that the scaled X position does not become negative or exceed * the maximum. */ if (pos > HIDMOUSE_XMAX_B16) { pos = HIDMOUSE_XMAX_B16; } else if (pos < 0) { pos = 0; } /* Save the updated X position */ priv->xaccum = pos; /* Do the same for the Y position */ #ifdef CONFIG_HIDMOUSE_SWAPXY disp = rpt->xdisp; if ((rpt->xdisp & 0x80) != 0) { disp |= 0xffffff00; } #else disp = rpt->ydisp; if ((rpt->ydisp & 0x80) != 0) { disp |= 0xffffff00; } #endif pos = priv->yaccum + CONFIG_HIDMOUSE_YSCALE * disp; if (pos > HIDMOUSE_YMAX_B16) { pos = HIDMOUSE_YMAX_B16; } else if (pos < 0) { pos = 0; } priv->yaccum = pos; #ifdef CONFIG_INPUT_MOUSE_WHEEL /* Do the same for the wheel position */ disp = rpt->wdisp; if ((rpt->wdisp & 0x80) != 0) { disp |= 0xffffff00; } pos = priv->waccum + CONFIG_HIDMOUSE_WSCALE * disp; if (pos > HIDMOUSE_WMAX_B16) { pos = HIDMOUSE_WMAX_B16; } else if (pos < 0) { pos = 0; } priv->waccum = pos; #endif } /**************************************************************************** * Name: usbhost_touchscreen * * Description: * Execute the (emulated) touchscreen press/drag/release state machine. * * Input Parameters: * priv - A reference to the mouse state structure. * rpt - The new mouse report data. * * Returned Value: * False if the mouse data should not be reported. * ****************************************************************************/ #ifdef CONFIG_HIDMOUSE_TSCIF static bool usbhost_touchscreen(FAR struct usbhost_state_s *priv, FAR struct usbhid_mousereport_s *rpt) { /* Check if the left button is pressed */ if ((rpt->buttons & USBHID_MOUSEIN_BUTTON1) == 0) { /* The left button is not pressed.. reset thresholding variables. */ priv->xlast = INVALID_POSITION_B16; priv->ylast = INVALID_POSITION_B16; /* Ignore the report if the button was not pressed last time * (BUTTON_NONE == button released and already reported; * BUTTON_RELEASED == button released, but not yet reported) */ if (priv->sample.event == BUTTON_NONE || priv->sample.event == BUTTON_RELEASED) { return false; } /* The left button has just been released. NOTE: We know from a * previous test, that this is a button release condition. This will * be changed to BUTTON_NONE after the button release has been * reported. */ priv->sample.event = BUTTON_RELEASED; } /* It is a left button press event. If the last button release event has * not been processed yet, then we have to ignore the button press event * (or else it will look like a drag event) */ else if (priv->sample.event == BUTTON_RELEASED) { /* If we have not yet processed the button release event, then we * cannot handle this button press event. We will have to discard the * data and wait for the next sample. */ return false; } /* Handle left-button down events */ else { /* If this is the first left button press report, then report that * event. If event == BUTTON_PRESSED, it will be set to set to * BUTTON_MOVE after the button press is first sampled. */ if (priv->sample.event != BUTTON_MOVE) { /* First button press */ priv->sample.event = BUTTON_PRESSED; } /* Otherwise, perform a thresholding operation so that the results * will be more stable. If the difference from the last sample is * small, then ignore the event. */ else if (!usbhost_xythreshold(priv)) { return false; } } /* We get here: * * (1) When the left button is just release, * (2) When the left button is first pressed, or * (3) When the left button is held and some significant 'dragging' * has occurred. */ return true; } #endif /**************************************************************************** * Name: usbhost_threshold * * Description: * Check if the current mouse position differs from the previous mouse * position by a threshold amount. * * Input Parameters: * priv - A reference to the mouse state structure. * * Returned Value: * True if the mouse position is significantly different from the last * reported mouse position. * ****************************************************************************/ static bool usbhost_threshold(FAR struct usbhost_state_s *priv) { #if CONFIG_HIDMOUSE_XTHRESH > 0 && CONFIG_HIDMOUSE_YTHRESH > 0 b16_t pos; b16_t diff; /* Get the difference in the X position from the last report */ pos = priv->xaccum; if (pos > priv->xlast) { diff = pos - priv->xlast; } else { diff = priv->xlast - pos; } /* Check if the X difference exceeds the report threshold */ if (diff >= HIDMOUSE_XTHRESH_B16) { return true; } /* Little or no change in the X direction, check the Y direction. */ pos = priv->yaccum; if (pos > priv->ylast) { diff = pos - priv->ylast; } else { diff = priv->ylast - pos; } if (diff >= HIDMOUSE_YTHRESH_B16) { return true; } #ifdef CONFIG_INPUT_MOUSE_WHEEL /* Get the difference in the wheel position from the last report */ pos = priv->waccum; if (pos > priv->wlast) { diff = pos - priv->wlast; } else { diff = priv->wlast - pos; } /* Check if the X difference exceeds the report threshold */ if (diff >= HIDMOUSE_WTHRESH_B16) { return true; } #endif /* Little or no change in either direction... don't report anything. */ return false; #else /* No thresholding */ return true; #endif } /**************************************************************************** * Name: usbhost_mouse_poll * * Description: * Periodically check for new mouse data. * * Input Parameters: * arg - A reference to the class instance to be destroyed. * * Returned Value: * None * ****************************************************************************/ static int usbhost_mouse_poll(int argc, char *argv[]) { FAR struct usbhost_state_s *priv; FAR struct usbhost_hubport_s *hport; FAR struct usbhid_mousereport_s *rpt; irqstate_t flags; #ifndef CONFIG_HIDMOUSE_TSCIF uint8_t buttons; #endif #if defined(CONFIG_DEBUG_USB) && defined(CONFIG_DEBUG_INFO) unsigned int npolls = 0; #endif unsigned int nerrors = 0; ssize_t nbytes; int ret = OK; 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 * decremented when this thread exits. */ priv = g_priv; DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL); hport = priv->usbclass.hport; priv->polling = true; nxsem_post(&g_syncsem); nxsig_sleep(1); /* Loop here until the device is disconnected */ uinfo("Entering poll loop\n"); while (!priv->disconnected) { /* Read the next mouse report. We will stall here until the mouse * sends data. */ nbytes = DRVR_TRANSFER(hport->drvr, priv->epin, priv->tbuffer, priv->tbuflen); /* Check for errors -- Bail if an excessive number of consecutive * errors are encountered. */ if (nbytes < 0) { /* If DRVR_TRANSFER() returns EAGAIN, that simply means that * the devices was not ready and has NAK'ed the transfer. That * should not be treated as an error (unless it persists for a * long time). */ uerr("ERROR: DRVR_TRANSFER returned: %d/%u\n", (int)nbytes, nerrors); if (nbytes != -EAGAIN) { if (++nerrors > 200) { uerr(" Too many errors... aborting: %d\n", nerrors); ret = (int)nbytes; break; } } } /* The report was received correctly. */ else { /* Success, reset the error counter */ nerrors = 0; /* Ignore the mouse data if no task has opened the driver. */ if (priv->open) { /* Get exclusive access to the mouse state data */ ret = nxmutex_lock(&priv->lock); if (ret < 0) { /* Break out and disconnect if the thread is canceled. */ break; } /* Get the HID mouse report */ rpt = (FAR struct usbhid_mousereport_s *)priv->tbuffer; /* Get the updated mouse position */ usbhost_position(priv, rpt); #ifdef CONFIG_HIDMOUSE_TSCIF /* Execute the touchscreen state machine */ if (usbhost_touchscreen(priv, rpt)) #else /* Check if any buttons have changed. If so, then report the * new mouse data. * * If not, then perform a thresholding operation so that the * results will be more stable. If the difference from the * last sample is small, then ignore the event. */ buttons = rpt->buttons & USBHID_MOUSEIN_BUTTON_MASK; if (buttons != priv->buttons || usbhost_threshold(priv)) #endif { /* We get here when either there is a meaningful button * change and/or a significant movement of the mouse. We * are going to report the mouse event. * * Snap to the new x/y position for subsequent * thresholding */ priv->xlast = priv->xaccum; priv->ylast = priv->yaccum; #ifdef CONFIG_INPUT_MOUSE_WHEEL priv->wlast = priv->waccum; #endif /* Update the sample X/Y positions */ priv->sample.x = b16toi(priv->xaccum); priv->sample.y = b16toi(priv->yaccum); #ifdef CONFIG_INPUT_MOUSE_WHEEL priv->sample.wheel = b16toi(priv->waccum); #endif #ifdef CONFIG_HIDMOUSE_TSCIF /* The X/Y positional data is now valid */ priv->sample.valid = true; /* Indicate the availability of new sample data * for this ID */ priv->sample.id = priv->id; #else /* Report and remember the new button state */ priv->sample.buttons = buttons; priv->buttons = buttons; #endif priv->valid = true; /* Notify any waiters that new HIDMOUSE data is available */ usbhost_notify(priv); } /* Release our lock on the state structure */ nxmutex_unlock(&priv->lock); } } /* 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 } /* We get here when the driver is removed, when too many errors have * been encountered, or the parent thread has been canceled. * * 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("Mouse 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 mouse 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 semaphore!) */ usbhost_destroy(priv); } else { /* No, we will destroy the driver instance when it is final open * reference is closed */ nxmutex_unlock(&priv->lock); } leave_critical_section(flags); return ret; } /**************************************************************************** * Name: usbhost_sample * * Description: * Check if mouse data is available * ****************************************************************************/ static int usbhost_sample(FAR struct usbhost_state_s *priv, FAR struct mouse_sample_s *sample) { irqstate_t flags; int ret = -EAGAIN; /* Interrupts me be disabled when this is called to (1) prevent posting * of semaphores from interrupt handlers, and (2) to prevent sampled data * from changing until it has been reported. */ flags = enter_critical_section(); /* Is there new mouse data available? */ if (priv->valid) { /* Return a copy of the sampled data. */ memcpy(sample, &priv->sample, sizeof(struct mouse_sample_s)); #ifdef CONFIG_HIDMOUSE_TSCIF /* Now manage state transitions */ if (sample->event == BUTTON_RELEASED) { /* Next.. No button press. Increment the ID so that next event ID * will be unique. X/Y positions are no longer valid. */ priv->sample.event = BUTTON_NONE; priv->id++; priv->sample.valid = false; } else if (sample->event == BUTTON_PRESSED) { /* First report -- next report will be a movement */ priv->sample.event = BUTTON_MOVE; } #endif /* The sample has been reported and is no longer valid */ priv->valid = false; ret = OK; } leave_critical_section(flags); return ret; } /**************************************************************************** * Name: usbhost_waitsample * * Description: * Wait for the next valid mouse sample * * Input Parameters: * priv - HID mouse state instance * sample - The location to regurn the sample data * ****************************************************************************/ static int usbhost_waitsample(FAR struct usbhost_state_s *priv, FAR struct mouse_sample_s *sample) { irqstate_t flags; int ret; /* Interrupts me be disabled when this is called to (1) prevent posting * of semaphores from interrupt handlers, and (2) to prevent sampled data * from changing until it has been reported. * * In addition, we will also disable pre-emption to prevent other threads * from getting control while we muck with the semaphores. */ sched_lock(); flags = enter_critical_section(); /* Now release the semaphore that manages mutually exclusive access to * the device structure. This may cause other tasks to become ready to * run, but they cannot run yet because pre-emption is disabled. */ nxmutex_unlock(&priv->lock); /* Try to get the a sample... if we cannot, then wait on the semaphore * that is posted when new sample data is available. */ while (usbhost_sample(priv, sample) < 0) { /* Wait for a change in the HIDMOUSE state */ iinfo("Waiting..\n"); priv->nwaiters++; ret = nxsem_wait(&priv->waitsem); priv->nwaiters--; if (ret < 0) { ierr("ERROR: nxsem_wait: %d\n", ret); goto errout; } /* Did the mouse become disconnected while we were waiting */ if (priv->disconnected) { ret = -ENODEV; goto errout; } } iinfo("Sampled\n"); /* Re-acquire the semaphore that manages mutually exclusive access to * the device structure. We may have to wait here. But we have our * sample. Interrupts and pre-emption will be re-enabled while we wait. */ ret = nxmutex_lock(&priv->lock); errout: /* Then re-enable interrupts. We might get interrupt here and there * could be a new sample. But no new threads will run because we still * have pre-emption disabled. */ leave_critical_section(flags); /* Restore pre-emption. We might get suspended here but that is okay * because we already have our sample. Note: this means that if there * were two threads reading from the HIDMOUSE for some reason, the data * might be read out of order. */ sched_unlock(); return ret; } /**************************************************************************** * 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; 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)); /* 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: { uinfo("Interface descriptor\n"); DEBUGASSERT(remaining >= USB_SIZEOF_IFDESC); /* Did we already find what we needed from * a preceding interface? */ if ((found & USBHOST_ALLFOUND) == USBHOST_ALLFOUND) { /* Yes.. then break out of the loop and use the preceding * interface. */ done = true; } else { /* Otherwise, discard any endpoints previously found */ 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_ISEPIN(epdesc->addr)) { /* 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 = true; 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_ALLFOUND) != USBHOST_ALLFOUND) { 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 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; } uinfo("Endpoint 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; /* Set aside a transfer buffer for exclusive * use by the mouse class driver */ ret = usbhost_tdalloc(priv); if (ret < 0) { uerr("ERROR: Failed to allocate transfer buffer\n"); return ret; } /* Increment the reference count. This will prevent usbhost_destroy() from * being called asynchronously if the device is removed. */ priv->crefs++; DEBUGASSERT(priv->crefs == 2); /* Start a worker task to poll the USB device. It would be nice to 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_HIDMOUSE_STACKSIZE). */ uinfo("Start poll task\n"); /* The inputs to a task started by kthread_create() are very awkward for * this purpose. They are really designed for command line tasks * (argc/argv). So the following is kludge pass binary data when the * mouse 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("mouse", CONFIG_HIDMOUSE_DEFPRIO, CONFIG_HIDMOUSE_STACKSIZE, usbhost_mouse_poll, 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(&g_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_hidmouse_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(const uint8_t *val) { return (uint16_t)val[1] << 8 | (uint16_t)val[0]; } /**************************************************************************** * 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 inline 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 inline 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; } /**************************************************************************** * 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_mouse_poll() task. */ priv->crefs = 1; /* Initialize mutex & semaphores */ nxmutex_init(&priv->lock); nxsem_init(&priv->waitsem, 0, 0); /* Return the instance of the USB mouse class driver */ return &priv->usbclass; } } /* An error occurred. Free the allocation and return NULL on all failures */ if (priv) { usbhost_freeclass(priv); } return NULL; } /**************************************************************************** * struct usbhost_class_s methods ****************************************************************************/ /**************************************************************************** * Name: usbhost_connect * * Description: * This function implements the connect() method of struct * usbhost_class_s. This method is a callback into the class * implementation. It is used to provide the device's configuration * descriptor to the class so that the class may initialize properly * * Input Parameters: * 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 mouse poll task was started successfully. * In this case, the disconnection will have to be handled on the worker * task. * - Failure occurred after the mouse poll task was started successfully. * In this case, the disconnection can be performed on the mouse poll * 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; int i; DEBUGASSERT(priv != NULL); /* Set an indication to any users of the mouse device that the device * is no longer available. */ priv->disconnected = true; uinfo("Disconnected\n"); /* Are there a thread(s) waiting for mouse data that will never come? */ for (i = 0; i < priv->nwaiters; i++) { /* Yes.. wake them up */ nxsem_post(&priv->waitsem); } /* Possibilities: * * - Failure occurred before the mouse poll task was started successfully. * In this case, the disconnection will have to be handled on the worker * task. * - Failure occurred after the mouse poll task was started successfully. * In this case, the disconnection can be performed on the mouse poll * thread. */ if (priv->polling) { /* The polling task is still alive. Signal the mouse 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; } /**************************************************************************** * Character driver methods ****************************************************************************/ /**************************************************************************** * Name: usbhost_open * * Description: * Standard character driver open method. * ****************************************************************************/ static int usbhost_open(FAR struct file *filep) { FAR struct inode *inode; FAR struct usbhost_state_s *priv; irqstate_t flags; int ret; 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 mouse 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 { /* Was the driver previously open? We need to perform special * initialization on the first time that the driver is opened. */ if (!priv->open) { /* Set the thresholding values so that the first button press * will be reported. */ priv->xlast = INVALID_POSITION_B16; priv->ylast = INVALID_POSITION_B16; #ifdef CONFIG_INPUT_MOUSE_WHEEL priv->wlast = INVALID_POSITION_B16; #endif /* Set the reported position to the center of the range */ priv->xaccum = (HIDMOUSE_XMAX_B16 >> 1); priv->yaccum = (HIDMOUSE_YMAX_B16 >> 1); } /* 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; /* 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; #ifdef CONFIG_HIDMOUSE_TSCIF FAR struct touch_sample_s *report; #else FAR struct mouse_report_s *report; #endif struct mouse_sample_s sample; 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 mouse 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 mouse is no longer connected. Refuse any further attempts * to access the driver. */ ret = -ENODEV; goto errout; } /* Try to read sample data. */ ret = usbhost_sample(priv, &sample); if (ret < 0) { /* Sample data is not available now. We would ave to wait to get * receive sample data. If the user has specified the O_NONBLOCK * option, then just return an error. */ if (filep->f_oflags & O_NONBLOCK) { /* Yes.. then return a failure */ ret = -EAGAIN; goto errout; } /* Wait for sample data */ ret = usbhost_waitsample(priv, &sample); if (ret < 0) { /* We might have been awakened by a signal */ ierr("ERROR: usbhost_waitsample: %d\n", ret); goto errout; } } /* We now have sampled HIDMOUSE data that we can report to the caller. */ #ifdef CONFIG_HIDMOUSE_TSCIF report = (FAR struct touch_sample_s *)buffer; memset(report, 0, SIZEOF_TOUCH_SAMPLE_S(1)); report->npoints = 1; report->point[0].id = sample.id; report->point[0].x = sample.x; report->point[0].y = sample.y; /* Report the appropriate flags */ if (sample.event == BUTTON_RELEASED) { /* But was released. Is the positional data valid? This is * important to know because the release will be sent to the * window based on its last positional data. */ if (sample.valid) { report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID | TOUCH_POS_VALID; } else { report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID; } } else if (sample.event == BUTTON_PRESSED) { /* First event */ report->point[0].flags = TOUCH_DOWN | TOUCH_ID_VALID | TOUCH_POS_VALID; } else /* if (sample->event == BUTTON_MOVE) */ { /* Movement of the same event */ report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID | TOUCH_POS_VALID; } iinfo(" id: %d\n", report->point[0].id); iinfo(" flags: %02x\n", report->point[0].flags); iinfo(" x: %d\n", report->point[0].x); iinfo(" y: %d\n", report->point[0].y); ret = SIZEOF_TOUCH_SAMPLE_S(1); #else report = (FAR struct mouse_report_s *)buffer; memset(report, 0, sizeof(struct mouse_report_s)); report->buttons = sample.buttons; report->x = sample.x; report->y = sample.y; #ifdef CONFIG_INPUT_MOUSE_WHEEL report->wheel = sample.wheel; #endif ret = sizeof(struct mouse_report_s); #endif errout: nxmutex_unlock(&priv->lock); iinfo("Returning: %d\n", ret); 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 mouse */ 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 mouse 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 mouse 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_HIDMOUSE_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_HIDMOUSE_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 mouse data. */ if (priv->valid) { poll_notify(priv->fds, CONFIG_HIDMOUSE_NPOLLWAITERS, POLLIN); } } else { /* This is a request to tear down the poll. */ struct pollfd **slot = (struct pollfd **)fds->priv; DEBUGASSERT(slot); /* Remove all memory of the poll setup */ *slot = NULL; fds->priv = NULL; } errout: nxmutex_unlock(&priv->lock); return ret; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: usbhost_mouse_init * * Description: * Initialize the USB storage HID mouse class driver. This function * should be called be platform-specific code in order to initialize and * register support for the USB host HID mouse 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_mouse_init(void) { /* Advertise our availability to support (certain) mouse devices */ return usbhost_registerclass(&g_hidmouse); } #endif /* CONFIG_USBHOST)&& !CONFIG_USBHOST_INT_DISABLE */