diff options
Diffstat (limited to 'nuttx/drivers/input/stmpe811_tsc.c')
| -rw-r--r-- | nuttx/drivers/input/stmpe811_tsc.c | 1144 |
1 files changed, 0 insertions, 1144 deletions
diff --git a/nuttx/drivers/input/stmpe811_tsc.c b/nuttx/drivers/input/stmpe811_tsc.c deleted file mode 100644 index c7f8b473b..000000000 --- a/nuttx/drivers/input/stmpe811_tsc.c +++ /dev/null @@ -1,1144 +0,0 @@ -/**************************************************************************** - * drivers/input/stmpe811_tsc.c - * - * Copyright (C) 2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * References: - * "STMPE811 S-Touch® advanced resistive touchscreen controller with 8-bit - * GPIO expander," Doc ID 14489 Rev 6, CD00186725, STMicroelectronics" - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <sys/types.h> - -#include <stdbool.h> -#include <stdio.h> -#include <unistd.h> -#include <string.h> -#include <fcntl.h> -#include <semaphore.h> - -#include <poll.h> -#include <errno.h> -#include <assert.h> -#include <debug.h> - -#include <nuttx/kmalloc.h> -#include <nuttx/arch.h> -#include <nuttx/fs/fs.h> -#include <nuttx/i2c.h> -#include <nuttx/wqueue.h> - -#include <nuttx/arch.h> -#include <nuttx/input/touchscreen.h> -#include <nuttx/input/stmpe811.h> - -#include "stmpe811.h" - -#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811) && !defined(CONFIG_STMPE811_TSC_DISABLE) - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -#define Direction_IN 0x00 -#define Direction_OUT 0x01 - -#define Polarity_Low 0x00 -#define Polarity_High 0x04 -#define Type_Level 0x00 -#define Type_Edge 0x02 - -#define IO_IT_0 0x01 -#define IO_IT_1 0x02 -#define IO_IT_2 0x04 -#define IO_IT_3 0x08 -#define IO_IT_4 0x10 -#define IO_IT_5 0x20 -#define IO_IT_6 0x40 -#define IO_IT_7 0x80 -#define ALL_IT 0xFF -#define IOE_JOY_IT (uint8_t)(IO_IT_3 | IO_IT_4 | IO_IT_5 | IO_IT_6 | IO_IT_7) -#define IOE_TS_IT (uint8_t)(IO_IT_0 | IO_IT_1 | IO_IT_2) -#define IOE_INMEMS_IT (uint8_t)(IO_IT_2 | IO_IT_3) - -#define EDGE_FALLING 0x01 -#define EDGE_RISING 0x02 - -#define TIMEOUT_MAX 0x3000 /*<! The value of the maximal timeout for I2C waiting loops */ - -/**************************************************************************** - * Private Types - ****************************************************************************/ - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ -/* Internal logic */ - -static void stmpe811_notify(FAR struct stmpe811_dev_s *priv); -static int stmpe811_sample(FAR struct stmpe811_dev_s *priv, - FAR struct stmpe811_sample_s *sample); -static inline int stmpe811_waitsample(FAR struct stmpe811_dev_s *priv, - FAR struct stmpe811_sample_s *sample); - -/* Character driver methods */ - -static int stmpe811_open(FAR struct file *filep); -static int stmpe811_close(FAR struct file *filep); -static ssize_t stmpe811_read(FAR struct file *filep, FAR char *buffer, - size_t len); -static int stmpe811_ioctl(FAR struct file *filep, int cmd, - unsigned long arg); -#ifndef CONFIG_DISABLE_POLL -static int stmpe811_poll(FAR struct file *filep, struct pollfd *fds, - bool setup); -#endif - -/* Initialization logic */ - -static inline void stmpe811_tscinitialize(FAR struct stmpe811_dev_s *priv); - -/**************************************************************************** - * Private Data - ****************************************************************************/ - -/* This the the vtable that supports the character driver interface */ - -static const struct file_operations g_stmpe811fops = -{ - stmpe811_open, /* open */ - stmpe811_close, /* close */ - stmpe811_read, /* read */ - 0, /* write */ - 0, /* seek */ - stmpe811_ioctl /* ioctl */ -#ifndef CONFIG_DISABLE_POLL - , stmpe811_poll /* poll */ -#endif -}; - -/**************************************************************************** - * Private Functions - ****************************************************************************/ -/**************************************************************************** - * Name: stmpe811_notify - * - * Description: - * Notify any threads waiting on touchscreen data that data is now - * available for reading. - * - ****************************************************************************/ - -static void stmpe811_notify(FAR struct stmpe811_dev_s *priv) -{ -#ifndef CONFIG_DISABLE_POLL - int i; -#endif - - /* If there are threads waiting for read data, then signal one of them - * that the read data is available. - */ - - if (priv->nwaiters > 0) - { - /* After posting this semaphore, we need to exit because the STMPE811 - * is no longer available. - */ - - sem_post(&priv->waitsem); - } - - /* If there are threads waiting on poll() for STMPE811 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. - */ - -#ifndef CONFIG_DISABLE_POLL - for (i = 0; i < CONFIG_STMPE811_NPOLLWAITERS; i++) - { - struct pollfd *fds = priv->fds[i]; - if (fds) - { - fds->revents |= POLLIN; - ivdbg("Report events: %02x\n", fds->revents); - sem_post(fds->sem); - } - } -#endif -} - -/**************************************************************************** - * Name: stmpe811_sample - * - * Description: - * Check if touchscreen sample data is available now and, if so, return - * the sample data. This is part of the stmpe811_read logic. - * - * Assumption: - * Pre-emption is disable to prevent the worker thread from running. - * Otherwise, sampled data may continue to change. - * - ****************************************************************************/ - -static int stmpe811_sample(FAR struct stmpe811_dev_s *priv, - FAR struct stmpe811_sample_s *sample) -{ - int ret = -EAGAIN; - - /* Is there new STMPE811 sample data available? */ - - if (priv->penchange) - { - /* Yes.. the state has changed in some way. Return a copy of the - * sampled data. - */ - - memcpy(sample, &priv->sample, sizeof(struct stmpe811_sample_s)); - - /* Now manage state transitions */ - - if (sample->contact == CONTACT_UP) - { - /* The sampling logic has detected pen-up in some condition other - * than CONTACT_NONE. Set the next state to CONTACT_NONE: Further - * pen-down reports will be ignored. Increment the ID so that - * next contact ID will be unique - */ - - priv->sample.contact = CONTACT_NONE; - priv->sample.valid = false; - priv->id++; - } - else if (sample->contact == CONTACT_DOWN) - { - /* The sampling logic has detected pen-up in some condition other - * than CONTACT_MOVE. Set the next state to CONTACT_MOVE: Further - * samples collected while the pen is down will reported as movement - * events. - */ - - priv->sample.contact = CONTACT_MOVE; - } - - priv->penchange = false; - ret = OK; - } - - return ret; -} - -/**************************************************************************** - * Name: stmpe811_waitsample - * - * Description: - * Wait for a sample to become available (this is really part of the - * stmpe811_read logic). - * - ****************************************************************************/ - -static inline int stmpe811_waitsample(FAR struct stmpe811_dev_s *priv, - FAR struct stmpe811_sample_s *sample) -{ - int ret; - - /* Disable pre-emption to prevent the worker thread from running - * asynchronously. - */ - - sched_lock(); - - /* 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. - */ - - sem_post(&priv->exclsem); - - /* Try to get the a sample... if we cannot, then wait on the semaphore - * that is posted when new sample data is availble. - */ - - while (stmpe811_sample(priv, sample) < 0) - { - /* Wait for a change in the STMPE811 state */ - - priv->nwaiters++; - ret = sem_wait(&priv->waitsem); - priv->nwaiters--; - - /* When we are re-awakened, pre-emption will again be disabled */ - - if (ret < 0) - { -#ifdef CONFIG_DEBUG - // Sample the errno (debug output could change it) - - int errval = errno; - - /* If we are awakened by a signal, then we need to return - * the failure now. - */ - - idbg("ERROR: sem_wait failed: %d\n", errval); - DEBUGASSERT(errval == EINTR); -#endif - ret = -EINTR; - goto errout; - } - } - - /* Re-acquire the 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 = sem_wait(&priv->exclsem); - -errout: - /* 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 STMPE811 for some reason, the data - * might be read out of order. - */ - - sched_unlock(); - return ret; -} - -/**************************************************************************** - * Name: stmpe811_open - * - * Description: - * Standard character driver open method. - * - ****************************************************************************/ - -static int stmpe811_open(FAR struct file *filep) -{ -#ifdef CONFIG_STMPE811_REFCNT - FAR struct inode *inode; - FAR struct stmpe811_dev_s *priv; - uint8_t tmp; - int ret; - - DEBUGASSERT(filep); - inode = filep->f_inode; - - DEBUGASSERT(inode && inode->i_private); - priv = (FAR struct stmpe811_dev_s *)inode->i_private; - - /* Get exclusive access to the driver data structure */ - - ret = sem_wait(&priv->exclsem); - if (ret < 0) - { - /* This should only happen if the wait was canceled by an signal */ - - DEBUGASSERT(errno == EINTR); - return -EINTR; - } - - /* Increment the reference count */ - - tmp = priv->crefs + 1; - if (tmp == 0) - { - /* More than 255 opens; uint8_t overflows to zero */ - - ret = -EMFILE; - goto errout_with_sem; - } - - /* When the reference increments to 1, this is the first open event - * on the driver.. and an opportunity to do any one-time initialization. - */ - - /* Save the new open count on success */ - - priv->crefs = tmp; - -errout_with_sem: - sem_post(&priv->exclsem); - return ret; -#else - return OK; -#endif -} - -/**************************************************************************** - * Name: stmpe811_close - * - * Description: - * Standard character driver close method. - * - ****************************************************************************/ - -static int stmpe811_close(FAR struct file *filep) -{ -#ifdef CONFIG_STMPE811_REFCNT - FAR struct inode *inode; - FAR struct stmpe811_dev_s *priv; - int ret; - - DEBUGASSERT(filep); - inode = filep->f_inode; - - DEBUGASSERT(inode && inode->i_private); - priv = (FAR struct stmpe811_dev_s *)inode->i_private; - - /* Get exclusive access to the driver data structure */ - - ret = sem_wait(&priv->exclsem); - if (ret < 0) - { - /* This should only happen if the wait was canceled by an signal */ - - DEBUGASSERT(errno == EINTR); - return -EINTR; - } - - /* Decrement the reference count unless it would decrement a negative - * value. When the count decrements to zero, there are no further - * open references to the driver. - */ - - if (priv->crefs >= 1) - { - priv->crefs--; - } - - sem_post(&priv->exclsem); -#endif - return OK; -} - -/**************************************************************************** - * Name: stmpe811_read - * - * Description: - * Standard character driver read method. - * - ****************************************************************************/ - -static ssize_t stmpe811_read(FAR struct file *filep, FAR char *buffer, size_t len) -{ - FAR struct inode *inode; - FAR struct stmpe811_dev_s *priv; - FAR struct touch_sample_s *report; - struct stmpe811_sample_s sample; - int ret; - - ivdbg("len=%d\n", len); - DEBUGASSERT(filep); - inode = filep->f_inode; - - DEBUGASSERT(inode && inode->i_private); - priv = (FAR struct stmpe811_dev_s *)inode->i_private; - - /* Verify that the caller has provided a buffer large enough to receive - * the touch data. - */ - - if (len < SIZEOF_TOUCH_SAMPLE_S(1)) - { - /* We could provide logic to break up a touch report into segments and - * handle smaller reads... but why? - */ - - return -ENOSYS; - } - - /* Get exclusive access to the driver data structure */ - - ret = sem_wait(&priv->exclsem); - if (ret < 0) - { - /* This should only happen if the wait was canceled by an signal */ - - DEBUGASSERT(errno == EINTR); - return -EINTR; - } - - /* Try to read sample data. */ - - ret = stmpe811_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) - { - ret = -EAGAIN; - goto errout; - } - - /* Wait for sample data */ - - ret = stmpe811_waitsample(priv, &sample); - if (ret < 0) - { - /* We might have been awakened by a signal */ - - goto errout; - } - } - - /* In any event, we now have sampled STMPE811 data that we can report - * to the caller. - */ - - 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->point[0].pressure = sample.z; - - /* Report the appropriate flags */ - - if (sample.contact == CONTACT_UP) - { - /* Pen is now up. 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 | TOUCH_PRESSURE_VALID; - } - else - { - report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID; - } - } - else if (sample.contact == CONTACT_DOWN) - { - /* First contact */ - - report->point[0].flags = TOUCH_DOWN | TOUCH_ID_VALID | - TOUCH_POS_VALID | TOUCH_PRESSURE_VALID; - } - else /* if (sample->contact == CONTACT_MOVE) */ - { - /* Movement of the same contact */ - - report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID | - TOUCH_POS_VALID | TOUCH_PRESSURE_VALID; - } - - ret = SIZEOF_TOUCH_SAMPLE_S(1); - -errout: - sem_post(&priv->exclsem); - return ret; -} - -/**************************************************************************** - * Name: stmpe811_ioctl - * - * Description: - * Standard character driver ioctl method. - * -****************************************************************************/ - -static int stmpe811_ioctl(FAR struct file *filep, int cmd, unsigned long arg) -{ - FAR struct inode *inode; - FAR struct stmpe811_dev_s *priv; - int ret; - - ivdbg("cmd: %d arg: %ld\n", cmd, arg); - DEBUGASSERT(filep); - inode = filep->f_inode; - - DEBUGASSERT(inode && inode->i_private); - priv = (FAR struct stmpe811_dev_s *)inode->i_private; - - /* Get exclusive access to the driver data structure */ - - ret = sem_wait(&priv->exclsem); - if (ret < 0) - { - /* This should only happen if the wait was canceled by an signal */ - - DEBUGASSERT(errno == EINTR); - return -EINTR; - } - - /* Process the IOCTL by command */ - - switch (cmd) - { - case TSIOC_SETFREQUENCY: /* arg: Pointer to uint32_t frequency value */ - { - FAR uint32_t *ptr = (FAR uint32_t *)((uintptr_t)arg); - DEBUGASSERT(priv->config != NULL && ptr != NULL); - priv->config->frequency = I2C_SETFREQUENCY(priv->i2c, *ptr); - } - break; - - case TSIOC_GETFREQUENCY: /* arg: Pointer to uint32_t frequency value */ - { - FAR uint32_t *ptr = (FAR uint32_t *)((uintptr_t)arg); - DEBUGASSERT(priv->config != NULL && ptr != NULL); - *ptr = priv->config->frequency; - } - break; - - default: - ret = -ENOTTY; - break; - } - - sem_post(&priv->exclsem); - return ret; -} - -/**************************************************************************** - * Name: stmpe811_poll - * - * Description: - * Standard character driver poll method. - * - ****************************************************************************/ - -#ifndef CONFIG_DISABLE_POLL -static int stmpe811_poll(FAR struct file *filep, FAR struct pollfd *fds, - bool setup) -{ - FAR struct inode *inode; - FAR struct stmpe811_dev_s *priv; - int ret; - int i; - - ivdbg("setup: %d\n", (int)setup); - DEBUGASSERT(filep && fds); - inode = filep->f_inode; - - DEBUGASSERT(inode && inode->i_private); - priv = (FAR struct stmpe811_dev_s *)inode->i_private; - - /* Are we setting up the poll? Or tearing it down? */ - - ret = sem_wait(&priv->exclsem); - if (ret < 0) - { - /* This should only happen if the wait was canceled by an signal */ - - DEBUGASSERT(errno == EINTR); - return -EINTR; - } - - if (setup) - { - /* Ignore waits that do not include POLLIN */ - - if ((fds->events & POLLIN) == 0) - { - idbg("ERROR: Missing POLLIN: revents: %08x\n", fds->revents); - ret = -EDEADLK; - goto errout; - } - - /* This is a request to set up the poll. Find an available - * slot for the poll structure reference - */ - - for (i = 0; i < CONFIG_STMPE811_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_STMPE811_NPOLLWAITERS) - { - idbg("ERROR: No availabled slot found: %d\n", i); - fds->priv = NULL; - ret = -EBUSY; - goto errout; - } - - /* Should we immediately notify on any of the requested events? */ - - if (priv->penchange) - { - stmpe811_notify(priv); - } - } - else if (fds->priv) - { - /* This is a request to tear down the poll. */ - - struct pollfd **slot = (struct pollfd **)fds->priv; - DEBUGASSERT(slot != NULL); - - /* Remove all memory of the poll setup */ - - *slot = NULL; - fds->priv = NULL; - } - -errout: - sem_post(&priv->exclsem); - return ret; -} -#endif - -/**************************************************************************** - * Name: stmpe811_timeoutworker - * - * Description: - * A timer has expired without receiving a pen up event. Check again. - * - ****************************************************************************/ - -static void stmpe811_timeoutworker(FAR void *arg) -{ - FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)arg; - - DEBUGASSERT(priv); - - /* Treat the timeout just like an interrupt occurred */ - - stmpe811_tscworker(priv, stmpe811_getreg8(priv, STMPE811_INT_STA)); -} - -/**************************************************************************** - * Name: stmpe811_timeout - * - * Description: - * A timer has expired without receiving a pen up event. Schedule work - * to check again. - * - ****************************************************************************/ - -static void stmpe811_timeout(int argc, uint32_t arg1, ...) -{ - FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)((uintptr_t)arg1); - int ret; - - /* Are we still stuck in the pen down state? */ - - if (priv->sample.contact == CONTACT_MOVE || - priv->sample.contact == CONTACT_MOVE) - { - /* Yes... is the worker thread available? If not, then apparently - * we have work already pending? - */ - - if (work_available(&priv->timeout)) - { - /* Yes.. Transfer processing to the worker thread. Since STMPE811 - * interrupts are disabled while the work is pending, no special - * action should be required to protect the work queue. - */ - - ret = work_queue(HPWORK, &priv->timeout, stmpe811_timeoutworker, priv, 0); - if (ret != 0) - { - illdbg("Failed to queue work: %d\n", ret); - } - } - } -} - -/**************************************************************************** - * Name: stmpe811_tscinitialize - * - * Description: - * Initialize the touchscreen controller. This is really a part of the - * stmpe811_register logic, - * - ****************************************************************************/ - -static inline void stmpe811_tscinitialize(FAR struct stmpe811_dev_s *priv) -{ - uint8_t regval; - - ivdbg("Initializing touchscreen controller\n"); - - /* Enable TSC and ADC functions */ - - regval = stmpe811_getreg8(priv, STMPE811_SYS_CTRL2); - regval &= ~(SYS_CTRL2_TSC_OFF | SYS_CTRL2_ADC_OFF); - stmpe811_putreg8(priv, STMPE811_SYS_CTRL2, regval); - - /* Enable the TSC global interrupts */ - - regval = stmpe811_getreg8(priv, STMPE811_INT_EN); - regval |= (uint32_t)(INT_TOUCH_DET | INT_FIFO_TH | INT_FIFO_OFLOW); - stmpe811_putreg8(priv, STMPE811_INT_EN, regval); - - /* Select Sample Time, bit number and ADC Reference */ - - stmpe811_putreg8(priv, STMPE811_ADC_CTRL1, priv->config->ctrl1); - - /* Wait for 20 ms */ - - up_mdelay(20); - - /* Select the ADC clock speed */ - - stmpe811_putreg8(priv, STMPE811_ADC_CTRL2, priv->config->ctrl2); - - /* Select TSC pins in non-GPIO mode (AF=0) */ - - regval = stmpe811_getreg8(priv, STMPE811_GPIO_AF); - regval &= ~(uint8_t)TSC_PIN_SET; - stmpe811_putreg8(priv, STMPE811_GPIO_AF, regval); - - /* Select 2 nF filter capacitor */ - - stmpe811_putreg8(priv, STMPE811_TSC_CFG, - (TSC_CFG_AVE_CTRL_4SAMPLES | TSC_CFG_TOUCH_DELAY_500US | TSC_CFG_SETTLING_500US)); - - /* Select single point reading */ - - stmpe811_putreg8(priv, STMPE811_FIFO_TH, 1); - - /* Reset and clear the FIFO. */ - - stmpe811_putreg8(priv, STMPE811_FIFO_STA, FIFO_STA_FIFO_RESET); - stmpe811_putreg8(priv, STMPE811_FIFO_STA, 0); - - /* set the data format for Z value: 7 fractional part and 1 whole part */ - - stmpe811_putreg8(priv, STMPE811_TSC_FRACTIONZ, 0x01); - - /* Set the driving capability of the device for TSC pins: 50mA */ - - stmpe811_putreg8(priv, STMPE811_TSC_IDRIVE, TSC_IDRIVE_50MA); - - /* Enable the TSC. Use no tracking index, touch-screen controller - * operation mode (XYZ). - */ - - stmpe811_putreg8(priv, STMPE811_TSC_CTRL, TSC_CTRL_EN); - - /* Clear all the status pending bits */ - - stmpe811_putreg8(priv, STMPE811_INT_STA, INT_ALL); -} - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: stmpe811_register - * - * Description: - * Enable TSC functionality. GPIO4-7 must be available. This function - * will register the touchsceen driver as /dev/inputN where N is the minor - * device number - * - * Input Parameters: - * handle - The handle previously returned by stmpe811_register - * minor - The input device minor number - * - * Returned Value: - * Zero is returned on success. Otherwise, a negated errno value is - * returned to indicate the nature of the failure. - * - ****************************************************************************/ - -int stmpe811_register(STMPE811_HANDLE handle, int minor) -{ - FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)handle; - char devname[DEV_NAMELEN]; - int ret; - - ivdbg("handle=%p minor=%d\n", handle, minor); - DEBUGASSERT(priv); - - /* Get exclusive access to the device structure */ - - ret = sem_wait(&priv->exclsem); - if (ret < 0) - { - int errval = errno; - idbg("ERROR: sem_wait failed: %d\n", errval); - return -errval; - } - - /* Make sure that the pins (4-7) need by the TSC are not already in use */ - - if ((priv->inuse & TSC_PIN_SET) != 0) - { - idbg("ERROR: TSC pins is already in-use: %02x\n", priv->inuse); - sem_post(&priv->exclsem); - return -EBUSY; - } - - /* Initialize the TS structure fields to their default values */ - - priv->minor = minor; - priv->penchange = false; - priv->threshx = 0; - priv->threshy = 0; - - /* Create a timer for catching missed pen up conditions */ - - priv->wdog = wd_create(); - if (!priv->wdog) - { - idbg("ERROR: Failed to create a watchdog\n", errno); - sem_post(&priv->exclsem); - return -ENOSPC; - } - - /* Register the character driver */ - - snprintf(devname, DEV_NAMELEN, DEV_FORMAT, minor); - ret = register_driver(devname, &g_stmpe811fops, 0666, priv); - if (ret < 0) - { - idbg("ERROR: Failed to register driver %s: %d\n", devname, ret); - sem_post(&priv->exclsem); - return ret; - } - - /* Initialize the touchscreen controller */ - - stmpe811_tscinitialize(priv); - - /* Inidicate that the touchscreen controller was successfully initialized */ - - priv->inuse |= TSC_PIN_SET; /* Pins 4-7 are now in-use */ - priv->flags |= STMPE811_FLAGS_TSC_INITIALIZED; /* TSC function is initialized */ - sem_post(&priv->exclsem); - return ret; -} - -/**************************************************************************** - * Name: stmpe811_tscworker - * - * Description: - * This function is called to handle a TSC interrupt. It is not really - * an interrupt handle because it is called from the STMPE811 "bottom half" - * logic that runs on the worker thread. - * - ****************************************************************************/ - -void stmpe811_tscworker(FAR struct stmpe811_dev_s *priv, uint8_t intsta) -{ - FAR struct stmpe811_config_s *config; /* Convenience pointer */ - bool pendown; /* true: pend is down */ - uint16_t xdiff; /* X difference used in thresholding */ - uint16_t ydiff; /* Y difference used in thresholding */ - uint16_t x; /* X position */ - uint16_t y; /* Y position */ - - ASSERT(priv != NULL); - - /* Cancel the missing pen up timer */ - - (void)wd_cancel(priv->wdog); - - /* Get a pointer the callbacks for convenience (and so the code is not so - * ugly). - */ - - config = priv->config; - DEBUGASSERT(config != NULL); - - /* Check for pen up or down from the TSC_STA ibit n the STMPE811_TSC_CTRL register. */ - - pendown = (stmpe811_getreg8(priv, STMPE811_TSC_CTRL) & TSC_CTRL_TSC_STA) != 0; - - /* Handle the change from pen down to pen up */ - - if (!pendown) - { - /* The pen is up.. reset thresholding variables. FIFOs will read zero if - * there is no data available (hence the choice of (0,0)) - */ - - priv->threshx = 0; - priv->threshy = 0; - - /* Ignore the interrupt if the pen was already up (CONTACT_NONE == pen up and - * already reported; CONTACT_UP == pen up, but not reported) - */ - - if (priv->sample.contact == CONTACT_NONE || - priv->sample.contact == CONTACT_UP) - { - goto ignored; - } - - /* A pen-down to up transition has been detected. CONTACT_UP indicates the - * initial loss of contzt. The state will be changed to CONTACT_NONE - * after the loss of contact is sampled. - */ - - priv->sample.contact = CONTACT_UP; - } - - /* The pen is down... check for data in the FIFO */ - - else if ((intsta & (INT_FIFO_TH|INT_FIFO_OFLOW)) != 0) - { - /* Read the next x and y positions from the FIFO. */ - -#ifdef CONFIG_STMPE811_SWAPXY - x = stmpe811_getreg16(priv, STMPE811_TSC_DATAX); - y = stmpe811_getreg16(priv, STMPE811_TSC_DATAY); -#else - x = stmpe811_getreg16(priv, STMPE811_TSC_DATAY); - y = stmpe811_getreg16(priv, STMPE811_TSC_DATAX); -#endif - - /* If we have not yet processed the last pen up event, then we - * cannot handle this pen down event. We will have to discard it. That - * should be okay because there will be another FIFO event right behind - * this one. Other kinds of data overruns are not harmful. - * - * Hmm.. a better design might be to disable FIFO interrupts when we - * detect pen up. Then re-enable them when CONTACT_UP is reported. - * That would save processing interrupts just to discard the data. - */ - - if (priv->sample.contact == CONTACT_UP) - { - /* We have not closed the loop on the last touch ... don't report - * anything. - */ - - goto ignored; - } - - /* 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. - * REVISIT: Should a large change in pressure also generate a event? - */ - - xdiff = x > priv->threshx ? (x - priv->threshx) : (priv->threshx - x); - ydiff = y > priv->threshy ? (y - priv->threshy) : (priv->threshy - y); - - if (xdiff < CONFIG_STMPE811_THRESHX && ydiff < CONFIG_STMPE811_THRESHY) - { - /* Little or no change in either direction ... don't report anything. */ - - goto ignored; - } - - /* When we see a big difference, snap to the new x/y thresholds */ - - priv->threshx = x; - priv->threshy = y; - - /* Update the x/y position in the sample data */ - - priv->sample.x = priv->threshx; - priv->sample.y = priv->threshy; - - /* Update the Z pressure index */ - - priv->sample.z = stmpe811_getreg8(priv, STMPE811_TSC_DATAZ); - priv->sample.valid = true; - - /* If this is the first (acknowledged) pen down report, then report - * this as the first contact. If contact == CONTACT_DOWN, it will be - * set to set to CONTACT_MOVE after the contact is first sampled. - */ - - if (priv->sample.contact != CONTACT_MOVE) - { - /* First contact */ - - priv->sample.contact = CONTACT_DOWN; - } - } - - /* Pen down, but no data in FIFO */ - - else - { - /* Ignore the interrupt... wait until there is data in the FIFO */ - - goto ignored; - } - - /* We get here if (1) we just went from a pen down to a pen up state OR (2) - * We just get a measurement from the FIFO in a pen down state. Indicate - * the availability of new sample data for this ID. - */ - - priv->sample.id = priv->id; - priv->penchange = true; - - /* Notify any waiters that new STMPE811 data is available */ - - stmpe811_notify(priv); - - /* If we think that the pend is still down, the start/re-start the pen up - * timer. - */ - -ignored: - if (priv->sample.contact == CONTACT_MOVE || - priv->sample.contact == CONTACT_MOVE) - { - (void)wd_start(priv->wdog, STMPE811_PENUP_TICKS, stmpe811_timeout, - 1, (uint32_t)((uintptr_t)priv)); - } - - /* Reset and clear all data in the FIFO */ - - stmpe811_putreg8(priv, STMPE811_FIFO_STA, FIFO_STA_FIFO_RESET); - stmpe811_putreg8(priv, STMPE811_FIFO_STA, 0); -} - -#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 && !CONFIG_STMPE811_TSC_DISABLE */ - |