diff options
Diffstat (limited to 'nuttx/drivers/input/ads7843e.c')
-rw-r--r-- | nuttx/drivers/input/ads7843e.c | 1199 |
1 files changed, 1199 insertions, 0 deletions
diff --git a/nuttx/drivers/input/ads7843e.c b/nuttx/drivers/input/ads7843e.c new file mode 100644 index 000000000..750b91ff2 --- /dev/null +++ b/nuttx/drivers/input/ads7843e.c @@ -0,0 +1,1199 @@ +/**************************************************************************** + * drivers/input/ads7843e.c + * + * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved. + * Authors: Gregory Nutt <gnutt@nuttx.org> + * Diego Sanchez <dsanchez@nx-engineering.com> + * + * References: + * "Touch Screen Controller, ADS7843," Burr-Brown Products from Texas + * Instruments, SBAS090B, September 2000, Revised May 2002" + * + * 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 <wdog.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/spi.h> +#include <nuttx/wqueue.h> + +#include <nuttx/input/touchscreen.h> +#include <nuttx/input/ads7843e.h> + +#include "ads7843e.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ +/* Low-level SPI helpers */ + +static inline void ads7843e_configspi(FAR struct spi_dev_s *spi); +#ifdef CONFIG_SPI_OWNBUS +static inline void ads7843e_select(FAR struct spi_dev_s *spi); +static inline void ads7843e_deselect(FAR struct spi_dev_s *spi); +#else +static void ads7843e_select(FAR struct spi_dev_s *spi); +static void ads7843e_deselect(FAR struct spi_dev_s *spi); +#endif + +static inline void ads7843e_waitbusy(FAR struct ads7843e_dev_s *priv); +static uint16_t ads7843e_sendcmd(FAR struct ads7843e_dev_s *priv, uint8_t cmd); + +/* Interrupts and data sampling */ + +static void ads7843e_notify(FAR struct ads7843e_dev_s *priv); +static int ads7843e_sample(FAR struct ads7843e_dev_s *priv, + FAR struct ads7843e_sample_s *sample); +static int ads7843e_waitsample(FAR struct ads7843e_dev_s *priv, + FAR struct ads7843e_sample_s *sample); +static void ads7843e_worker(FAR void *arg); +static int ads7843e_interrupt(int irq, FAR void *context); + +/* Character driver methods */ + +static int ads7843e_open(FAR struct file *filep); +static int ads7843e_close(FAR struct file *filep); +static ssize_t ads7843e_read(FAR struct file *filep, FAR char *buffer, size_t len); +static int ads7843e_ioctl(FAR struct file *filep, int cmd, unsigned long arg); +#ifndef CONFIG_DISABLE_POLL +static int ads7843e_poll(FAR struct file *filep, struct pollfd *fds, bool setup); +#endif + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/* This the the vtable that supports the character driver interface */ + +static const struct file_operations ads7843e_fops = +{ + ads7843e_open, /* open */ + ads7843e_close, /* close */ + ads7843e_read, /* read */ + 0, /* write */ + 0, /* seek */ + ads7843e_ioctl /* ioctl */ +#ifndef CONFIG_DISABLE_POLL + , ads7843e_poll /* poll */ +#endif +}; + +/* If only a single ADS7843E device is supported, then the driver state + * structure may as well be pre-allocated. + */ + +#ifndef CONFIG_ADS7843E_MULTIPLE +static struct ads7843e_dev_s g_ads7843e; + +/* Otherwise, we will need to maintain allocated driver instances in a list */ + +#else +static struct ads7843e_dev_s *g_ads7843elist; +#endif + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Function: ads7843e_select + * + * Description: + * Select the SPI, locking and re-configuring if necessary. This function + * must be called before initiating any sequence of SPI operations. If we + * are sharing the SPI bus with other devices (CONFIG_SPI_OWNBUS undefined) + * then we need to lock and configure the SPI bus for each transfer. + * + * Parameters: + * spi - Reference to the SPI driver structure + * + * Returned Value: + * None + * + * Assumptions: + * + ****************************************************************************/ + +#ifdef CONFIG_SPI_OWNBUS +static inline void ads7843e_select(FAR struct spi_dev_s *spi) +{ + /* We own the SPI bus, so just select the chip */ + + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, true); +} +#else +static void ads7843e_select(FAR struct spi_dev_s *spi) +{ + /* Select ADS7843 chip (locking the SPI bus in case there are multiple + * devices competing for the SPI bus + */ + + (void)SPI_LOCK(spi, true); + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, true); + + /* Now make sure that the SPI bus is configured for the ADS7843 (it + * might have gotten configured for a different device while unlocked) + */ + + SPI_SETMODE(spi, CONFIG_ADS7843E_SPIMODE); + SPI_SETBITS(spi, 8); + SPI_SETFREQUENCY(spi, CONFIG_ADS7843E_FREQUENCY); +} +#endif + +/**************************************************************************** + * Function: ads7843e_deselect + * + * Description: + * De-select the SPI, unlocking as necessary. This function must be + * after completing a sequence of SPI operations. If we are sharing the SPI + * bus with other devices (CONFIG_SPI_OWNBUS undefined) then we need to + * un-lock the SPI bus for each transfer, possibly losing the current + * configuration. + * + * Parameters: + * spi - Reference to the SPI driver structure + * + * Returned Value: + * None + * + * Assumptions: + * + ****************************************************************************/ + +#ifdef CONFIG_SPI_OWNBUS +static inline void ads7843e_deselect(FAR struct spi_dev_s *spi) +{ + /* We own the SPI bus, so just de-select the chip */ + + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, false); +} +#else +static void ads7843e_deselect(FAR struct spi_dev_s *spi) +{ + /* De-select ADS7843 chip and relinquish the SPI bus. */ + + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, false); + (void)SPI_LOCK(spi, false); +} +#endif + +/**************************************************************************** + * Function: ads7843e_configspi + * + * Description: + * Configure the SPI for use with the ADS7843E. This function should be + * called once during touchscreen initialization to configure the SPI + * bus. Note that if CONFIG_SPI_OWNBUS is not defined, then this function + * does nothing. + * + * Parameters: + * spi - Reference to the SPI driver structure + * + * Returned Value: + * None + * + * Assumptions: + * + ****************************************************************************/ + +static inline void ads7843e_configspi(FAR struct spi_dev_s *spi) +{ + idbg("Mode: %d Bits: 8 Frequency: %d\n", + CONFIG_ADS7843E_SPIMODE, CONFIG_ADS7843E_FREQUENCY); + + /* Configure SPI for the ADS7843. But only if we own the SPI bus. Otherwise, don't + * bother because it might change. + */ + +#ifdef CONFIG_SPI_OWNBUS + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, true); + SPI_SETMODE(spi, CONFIG_ADS7843E_SPIMODE); + SPI_SETBITS(spi, 8); + SPI_SETFREQUENCY(spi, CONFIG_ADS7843E_FREQUENCY); + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, false); +#endif +} + +/**************************************************************************** + * Name: ads7843e_waitbusy + ****************************************************************************/ + +static inline void ads7843e_waitbusy(FAR struct ads7843e_dev_s *priv) +{ + while (priv->config->busy(priv->config)); +} + +/**************************************************************************** + * Name: ads7843e_sendcmd + ****************************************************************************/ + +static uint16_t ads7843e_sendcmd(FAR struct ads7843e_dev_s *priv, uint8_t cmd) +{ + uint8_t buffer[2]; + uint16_t result; + + /* Select the ADS7843E */ + + ads7843e_select(priv->spi); + + /* Send the command */ + + (void)SPI_SEND(priv->spi, cmd); + ads7843e_waitbusy(priv); + + /* Read the data */ + + SPI_RECVBLOCK(priv->spi, buffer, 2); + ads7843e_deselect(priv->spi); + + result = ((uint16_t)buffer[0] << 8) | (uint16_t)buffer[1]; + result = result >> 4; + + ivdbg("cmd:%02x response:%04x\n", cmd, result); + return result; +} + +/**************************************************************************** + * Name: ads7843e_notify + ****************************************************************************/ + +static void ads7843e_notify(FAR struct ads7843e_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 ADS7843E + * is no longer available. + */ + + sem_post(&priv->waitsem); + } + + /* If there are threads waiting on poll() for ADS7843E 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_ADS7843E_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: ads7843e_sample + ****************************************************************************/ + +static int ads7843e_sample(FAR struct ads7843e_dev_s *priv, + FAR struct ads7843e_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 = irqsave(); + + /* Is there new ADS7843E 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 ads7843e_sample_s )); + + /* Now manage state transitions */ + + if (sample->contact == CONTACT_UP) + { + /* Next.. no contact. Increment the ID so that next contact ID + * will be unique. X/Y positions are no longer valid. + */ + + priv->sample.contact = CONTACT_NONE; + priv->sample.valid = false; + priv->id++; + } + else if (sample->contact == CONTACT_DOWN) + { + /* First report -- next report will be a movement */ + + priv->sample.contact = CONTACT_MOVE; + } + + priv->penchange = false; + ret = OK; + } + + irqrestore(flags); + return ret; +} + +/**************************************************************************** + * Name: ads7843e_waitsample + ****************************************************************************/ + +static int ads7843e_waitsample(FAR struct ads7843e_dev_s *priv, + FAR struct ads7843e_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 = irqsave(); + + /* 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->devsem); + + /* Try to get the a sample... if we cannot, then wait on the semaphore + * that is posted when new sample data is available. + */ + + while (ads7843e_sample(priv, sample) < 0) + { + /* Wait for a change in the ADS7843E state */ + + ivdbg("Waiting..\n"); + priv->nwaiters++; + ret = sem_wait(&priv->waitsem); + priv->nwaiters--; + + if (ret < 0) + { + /* If we are awakened by a signal, then we need to return + * the failure now. + */ + + idbg("sem_wait: %d\n", errno); + DEBUGASSERT(errno == EINTR); + ret = -EINTR; + goto errout; + } + } + + ivdbg("Sampled\n"); + + /* 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->devsem); + +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. + */ + + irqrestore(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 ADS7843E for some reason, the data + * might be read out of order. + */ + + sched_unlock(); + return ret; +} + +/**************************************************************************** + * Name: ads7843e_schedule + ****************************************************************************/ + +static int ads7843e_schedule(FAR struct ads7843e_dev_s *priv) +{ + FAR struct ads7843e_config_s *config; + int ret; + + /* Get a pointer the callbacks for convenience (and so the code is not so + * ugly). + */ + + config = priv->config; + DEBUGASSERT(config != NULL); + + /* Disable further interrupts. ADS7843E interrupts will be re-enabled + * after the worker thread executes. + */ + + config->enable(config, false); + + /* Disable the watchdog timer. It will be re-enabled in the worker thread + * while the pen remains down. + */ + + wd_cancel(priv->wdog); + + /* Transfer processing to the worker thread. Since ADS7843E interrupts are + * disabled while the work is pending, no special action should be required + * to protected the work queue. + */ + + DEBUGASSERT(priv->work.worker == NULL); + ret = work_queue(&priv->work, ads7843e_worker, priv, 0); + if (ret != 0) + { + illdbg("Failed to queue work: %d\n", ret); + } + + return OK; +} + +/**************************************************************************** + * Name: ads7843e_wdog + ****************************************************************************/ + +static void ads7843e_wdog(int argc, uint32_t arg1, ...) +{ + FAR struct ads7843e_dev_s *priv = (FAR struct ads7843e_dev_s *)((uintptr_t)arg1); + (void)ads7843e_schedule(priv); +} + +/**************************************************************************** + * Name: ads7843e_worker + ****************************************************************************/ + +static void ads7843e_worker(FAR void *arg) +{ + FAR struct ads7843e_dev_s *priv = (FAR struct ads7843e_dev_s *)arg; + FAR struct ads7843e_config_s *config; + bool pendown; + + ASSERT(priv != NULL); + + /* Get a pointer the callbacks for convenience (and so the code is not so + * ugly). + */ + + config = priv->config; + DEBUGASSERT(config != NULL); + + /* Disable the watchdog timer */ + + wd_cancel(priv->wdog); + + /* Check for pen up or down by reading the PENIRQ GPIO. */ + + pendown = config->pendown(config); + + /* Handle the change from pen down to pen up */ + + if (!pendown) + { + /* 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) + { + goto errout; + } + + /* The pen is up. NOTE: We know from a previous test, that this is a + * loss of contact condition. This will be changed to CONTACT_NONE + * after the loss of contact is sampled. + */ + + priv->sample.contact = CONTACT_UP; + } + + /* It is a pen down event. If the last loss-of-contact event has not been + * processed yet, then we have to ignore the pen down event (or else it will + * look like a drag event) + */ + + else if (priv->sample.contact == CONTACT_UP) + { + goto errout; + } + else + { + /* Handle pen down events. First, sample positional values. */ + + priv->sample.x = ads7843e_sendcmd(priv, ADS7843_CMD_XPOSITION); + priv->sample.y = ads7843e_sendcmd(priv, ADS7843_CMD_YPOSITION); + + /* The X/Y positional data is now valid */ + + 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; + } + + /* Continue to sample the position while the pen is down */ + + wd_start(priv->wdog, ADS7843E_WDOG_DELAY, ads7843e_wdog, 1, (uint32_t)priv); + } + + /* Indicate the availability of new sample data for this ID */ + + priv->sample.id = priv->id; + priv->penchange = true; + + /* Notify any waiters that new ADS7843E data is available */ + + ads7843e_notify(priv); + + /* Exit, re-enabling ADS7843E interrupts */ + +errout: + (void)ads7843e_sendcmd(priv, ADS7843_CMD_ENABPINIRQ); + config->enable(config, true); +} + +/**************************************************************************** + * Name: ads7843e_interrupt + ****************************************************************************/ + +static int ads7843e_interrupt(int irq, FAR void *context) +{ + FAR struct ads7843e_dev_s *priv; + FAR struct ads7843e_config_s *config; + int ret; + + /* Which ADS7843E device caused the interrupt? */ + +#ifndef CONFIG_ADS7843E_MULTIPLE + priv = &g_ads7843e; +#else + for (priv = g_ads7843elist; + priv && priv->configs->irq != irq; + priv = priv->flink); + + ASSERT(priv != NULL); +#endif + + /* Get a pointer the callbacks for convenience (and so the code is not so + * ugly). + */ + + config = priv->config; + DEBUGASSERT(config != NULL); + + /* Schedule sampling to occur on the worker thread */ + + ret = ads7843e_schedule(priv); + + /* Clear any pending interrupts and return success */ + + config->clear(config); + return ret; +} + +/**************************************************************************** + * Name: ads7843e_open + ****************************************************************************/ + +static int ads7843e_open(FAR struct file *filep) +{ +#ifdef CONFIG_ADS7843E_REFCNT + FAR struct inode *inode; + FAR struct ads7843e_dev_s *priv; + uint8_t tmp; + int ret; + + ivdbg("Opening\n"); + + DEBUGASSERT(filep); + inode = filep->f_inode; + + DEBUGASSERT(inode && inode->i_private); + priv = (FAR struct ads7843e_dev_s *)inode->i_private; + + /* Get exclusive access to the driver data structure */ + + ret = sem_wait(&priv->devsem); + 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->devsem); + return ret; +#else + ivdbg("Opening\n"); + return OK; +#endif +} + +/**************************************************************************** + * Name: ads7843e_close + ****************************************************************************/ + +static int ads7843e_close(FAR struct file *filep) +{ +#ifdef CONFIG_ADS7843E_REFCNT + FAR struct inode *inode; + FAR struct ads7843e_dev_s *priv; + int ret; + + ivdbg("Closing\n"); + DEBUGASSERT(filep); + inode = filep->f_inode; + + DEBUGASSERT(inode && inode->i_private); + priv = (FAR struct ads7843e_dev_s *)inode->i_private; + + /* Get exclusive access to the driver data structure */ + + ret = sem_wait(&priv->devsem); + 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->devsem); +#endif + ivdbg("Closing\n"); + return OK; +} + +/**************************************************************************** + * Name: ads7843e_read + ****************************************************************************/ + +static ssize_t ads7843e_read(FAR struct file *filep, FAR char *buffer, size_t len) +{ + FAR struct inode *inode; + FAR struct ads7843e_dev_s *priv; + FAR struct touch_sample_s *report; + struct ads7843e_sample_s sample; + int ret; + + ivdbg("buffer:%p len:%d\n", buffer, len); + DEBUGASSERT(filep); + inode = filep->f_inode; + + DEBUGASSERT(inode && inode->i_private); + priv = (FAR struct ads7843e_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? + */ + + idbg("Unsupported read size: %d\n", len); + return -ENOSYS; + } + + /* Get exclusive access to the driver data structure */ + + ret = sem_wait(&priv->devsem); + if (ret < 0) + { + /* This should only happen if the wait was canceled by an signal */ + + idbg("sem_wait: %d\n", errno); + DEBUGASSERT(errno == EINTR); + return -EINTR; + } + + /* Try to read sample data. */ + + ret = ads7843e_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. + */ + + ivdbg("Sample data is not available\n"); + if (filep->f_oflags & O_NONBLOCK) + { + ret = -EAGAIN; + goto errout; + } + + /* Wait for sample data */ + + ret = ads7843e_waitsample(priv, &sample); + if (ret < 0) + { + /* We might have been awakened by a signal */ + + idbg("ads7843e_waitsample: %d\n", ret); + goto errout; + } + } + + /* In any event, we now have sampled ADS7843E 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 = priv->id; + report->point[0].x = sample.x; + report->point[0].y = sample.y; + + /* 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; + } + else /* if (sample->contact == CONTACT_MOVE) */ + { + /* Movement of the same contact */ + + report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID | TOUCH_POS_VALID; + } + + ivdbg(" id: %d\n", report->point[0].id); + ivdbg(" flags: %02x\n", report->point[0].flags); + ivdbg(" x: %d\n", report->point[0].x); + ivdbg(" y: %d\n", report->point[0].y); + + ret = SIZEOF_TOUCH_SAMPLE_S(1); + +errout: + sem_post(&priv->devsem); + ivdbg("Returning: %d\n", ret); + return ret; +} + +/**************************************************************************** + * Name:ads7843e_ioctl + ****************************************************************************/ + +static int ads7843e_ioctl(FAR struct file *filep, int cmd, unsigned long arg) +{ + FAR struct inode *inode; + FAR struct ads7843e_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 ads7843e_dev_s *)inode->i_private; + + /* Get exclusive access to the driver data structure */ + + ret = sem_wait(&priv->devsem); + 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 = SPI_SETFREQUENCY(priv->spi, *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->devsem); + return ret; +} + +/**************************************************************************** + * Name: ads7843e_poll + ****************************************************************************/ + +#ifndef CONFIG_DISABLE_POLL +static int ads7843e_poll(FAR struct file *filep, FAR struct pollfd *fds, + bool setup) +{ + FAR struct inode *inode; + FAR struct ads7843e_dev_s *priv; + pollevent_t eventset; + int ndx; + int ret = OK; + int i; + + ivdbg("setup: %d\n", (int)setup); + DEBUGASSERT(filep && fds); + inode = filep->f_inode; + + DEBUGASSERT(inode && inode->i_private); + priv = (FAR struct ads7843e_dev_s *)inode->i_private; + + /* Are we setting up the poll? Or tearing it down? */ + + ret = sem_wait(&priv->devsem); + 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) + { + 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_ADS7843E_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_ADS7843E_NPOLLWAITERS) + { + fds->priv = NULL; + ret = -EBUSY; + goto errout; + } + + /* Should we immediately notify on any of the requested events? */ + + if (priv->penchange) + { + ads7843e_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->devsem); + return ret; +} +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: ads7843e_register + * + * Description: + * Configure the ADS7843E to use the provided SPI device instance. This + * will register the driver as /dev/inputN where N is the minor device + * number + * + * Input Parameters: + * dev - An SPI driver instance + * config - Persistent board configuration data + * 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 ads7843e_register(FAR struct spi_dev_s *dev, + FAR struct ads7843e_config_s *config, int minor) +{ + FAR struct ads7843e_dev_s *priv; + char devname[DEV_NAMELEN]; +#ifdef CONFIG_ADS7843E_MULTIPLE + irqstate_t flags; +#endif + int ret; + + ivdbg("dev: %p minor: %d\n", dev, minor); + + /* Debug-only sanity checks */ + + DEBUGASSERT(dev != NULL && config != NULL && minor >= 0 && minor < 100); + + /* Create and initialize a ADS7843E device driver instance */ + +#ifndef CONFIG_ADS7843E_MULTIPLE + priv = &g_ads7843e; +#else + priv = (FAR struct ads7843e_dev_s *)kmalloc(sizeof(struct ads7843e_dev_s)); + if (!priv) + { + idbg("kmalloc(%d) failed\n", sizeof(struct ads7843e_dev_s)); + return -ENOMEM; + } +#endif + + /* Initialize the ADS7843E device driver instance */ + + memset(priv, 0, sizeof(struct ads7843e_dev_s)); + priv->spi = dev; /* Save the SPI device handle */ + priv->config = config; /* Save the board configuration */ + priv->wdog = wd_create(); /* Create a watchdog timer */ + sem_init(&priv->devsem, 0, 1); /* Initialize device structure semaphore */ + sem_init(&priv->waitsem, 0, 0); /* Initialize pen event wait semaphore */ + + /* Make sure that interrupts are disabled */ + + config->clear(config); + config->enable(config, false); + + /* Attach the interrupt handler */ + + ret = config->attach(config, ads7843e_interrupt); + if (ret < 0) + { + idbg("Failed to attach interrupt\n"); + goto errout_with_priv; + } + + /* Configure the SPI interface */ + + ads7843e_configspi(dev); + + /* Enable the PEN IRQ */ + + ads7843e_sendcmd(priv, ADS7843_CMD_ENABPINIRQ); + + /* Register the device as an input device */ + + (void)snprintf(devname, DEV_NAMELEN, DEV_FORMAT, minor); + ivdbg("Registering %s\n", devname); + + ret = register_driver(devname, &ads7843e_fops, 0666, priv); + if (ret < 0) + { + idbg("register_driver() failed: %d\n", ret); + goto errout_with_priv; + } + + /* If multiple ADS7843E devices are supported, then we will need to add + * this new instance to a list of device instances so that it can be + * found by the interrupt handler based on the recieved IRQ number. + */ + +#ifdef CONFIG_ADS7843E_MULTIPLE + priv->flink = g_ads7843elist; + g_ads7843elist = priv; + irqrestore(flags); +#endif + + /* Schedule work to perform the initial sampling and to set the data + * availability conditions. + */ + + ret = work_queue(&priv->work, ads7843e_worker, priv, 0); + if (ret != 0) + { + idbg("Failed to queue work: %d\n", ret); + goto errout_with_priv; + } + + /* And return success (?) */ + + return OK; + +errout_with_priv: + sem_destroy(&priv->devsem); +#ifdef CONFIG_ADS7843E_MULTIPLE + kfree(priv); +#endif + return ret; +} |