diff options
Diffstat (limited to 'nuttx/drivers/input/max11802.c')
| -rw-r--r-- | nuttx/drivers/input/max11802.c | 1313 |
1 files changed, 0 insertions, 1313 deletions
diff --git a/nuttx/drivers/input/max11802.c b/nuttx/drivers/input/max11802.c deleted file mode 100644 index ea3883cd0..000000000 --- a/nuttx/drivers/input/max11802.c +++ /dev/null @@ -1,1313 +0,0 @@ -/**************************************************************************** - * drivers/input/max11802.c - * - * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved. - * Authors: Gregory Nutt <gnutt@nuttx.org> - * Petteri Aimonen <jpa@nx.mail.kapsi.fi> - * - * References: - * "Low-Power, Ultra-Small Resistive Touch-Screen Controllers - * with I2C/SPI Interface" Maxim IC, Rev 3, 10/2010 - * - * 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/max11802.h> - -#include "max11802.h" - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/* This is a value for the threshold that guantees a big difference on the - * first pendown (but can't overflow). - */ - -#define INVALID_THRESHOLD 0x1000 - -/**************************************************************************** - * Private Types - ****************************************************************************/ - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ -/* Low-level SPI helpers */ - -#ifdef CONFIG_SPI_OWNBUS -static inline void max11802_configspi(FAR struct spi_dev_s *spi); -# define max11802_lock(spi) -# define max11802_unlock(spi) -#else -# define max11802_configspi(spi); -static void max11802_lock(FAR struct spi_dev_s *spi); -static void max11802_unlock(FAR struct spi_dev_s *spi); -#endif - -static uint16_t max11802_sendcmd(FAR struct max11802_dev_s *priv, uint8_t cmd, int *tags); - -/* Interrupts and data sampling */ - -static void max11802_notify(FAR struct max11802_dev_s *priv); -static int max11802_sample(FAR struct max11802_dev_s *priv, - FAR struct max11802_sample_s *sample); -static int max11802_waitsample(FAR struct max11802_dev_s *priv, - FAR struct max11802_sample_s *sample); -static void max11802_worker(FAR void *arg); -static int max11802_interrupt(int irq, FAR void *context); - -/* Character driver methods */ - -static int max11802_open(FAR struct file *filep); -static int max11802_close(FAR struct file *filep); -static ssize_t max11802_read(FAR struct file *filep, FAR char *buffer, size_t len); -static int max11802_ioctl(FAR struct file *filep, int cmd, unsigned long arg); -#ifndef CONFIG_DISABLE_POLL -static int max11802_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 max11802_fops = -{ - max11802_open, /* open */ - max11802_close, /* close */ - max11802_read, /* read */ - 0, /* write */ - 0, /* seek */ - max11802_ioctl /* ioctl */ -#ifndef CONFIG_DISABLE_POLL - , max11802_poll /* poll */ -#endif -}; - -/* If only a single MAX11802 device is supported, then the driver state - * structure may as well be pre-allocated. - */ - -#ifndef CONFIG_MAX11802_MULTIPLE -static struct max11802_dev_s g_max11802; - -/* Otherwise, we will need to maintain allocated driver instances in a list */ - -#else -static struct max11802_dev_s *g_max11802list; -#endif - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Function: max11802_lock - * - * Description: - * Lock the SPI bus and re-configure as necessary. This function must be - * to assure: (1) exclusive access to the SPI bus, and (2) to assure that - * the shared bus is properly configured for the touchscreen controller. - * - * Parameters: - * spi - Reference to the SPI driver structure - * - * Returned Value: - * None - * - * Assumptions: - * - ****************************************************************************/ - -#ifndef CONFIG_SPI_OWNBUS -static void max11802_lock(FAR struct spi_dev_s *spi) -{ - /* Lock the SPI bus because there are multiple devices competing for the - * SPI bus - */ - - (void)SPI_LOCK(spi, true); - - /* We have the lock. Now make sure that the SPI bus is configured for the - * MAX11802 (it might have gotten configured for a different device while - * unlocked) - */ - - SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, true); - SPI_SETMODE(spi, CONFIG_MAX11802_SPIMODE); - SPI_SETBITS(spi, 8); - SPI_SETFREQUENCY(spi, CONFIG_MAX11802_FREQUENCY); - SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, false); -} -#endif - -/**************************************************************************** - * Function: max11802_unlock - * - * Description: - * 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: - * - ****************************************************************************/ - -#ifndef CONFIG_SPI_OWNBUS -static void max11802_unlock(FAR struct spi_dev_s *spi) -{ - /* Relinquish the SPI bus. */ - - (void)SPI_LOCK(spi, false); -} -#endif - -/**************************************************************************** - * Function: max11802_configspi - * - * Description: - * Configure the SPI for use with the MAX11802. 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: - * - ****************************************************************************/ - -#ifdef CONFIG_SPI_OWNBUS -static inline void max11802_configspi(FAR struct spi_dev_s *spi) -{ - /* Configure SPI for the MAX11802. But only if we own the SPI bus. Otherwise, don't - * bother because it might change. - */ - - SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, true); - SPI_SETMODE(spi, CONFIG_MAX11802_SPIMODE); - SPI_SETBITS(spi, 8); - SPI_SETFREQUENCY(spi, CONFIG_MAX11802_FREQUENCY); - SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, false); -} -#endif - -/**************************************************************************** - * Name: max11802_sendcmd - ****************************************************************************/ - -static uint16_t max11802_sendcmd(FAR struct max11802_dev_s *priv, uint8_t cmd, int *tags) -{ - uint8_t buffer[2]; - uint16_t result; - - /* Select the MAX11802 */ - - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, true); - - /* Send the command */ - - (void)SPI_SEND(priv->spi, cmd); - - /* Read the data */ - - SPI_RECVBLOCK(priv->spi, buffer, 2); - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, false); - - result = ((uint16_t)buffer[0] << 8) | (uint16_t)buffer[1]; - *tags = result & 0xF; - result >>= 4; // Get rid of tags - - ivdbg("cmd:%02x response:%04x\n", cmd, result); - return result; -} - -/**************************************************************************** - * Name: max11802_notify - ****************************************************************************/ - -static void max11802_notify(FAR struct max11802_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 sample - * is no longer available. - */ - - sem_post(&priv->waitsem); - } - - /* If there are threads waiting on poll() for MAX11802 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_MAX11802_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: max11802_sample - ****************************************************************************/ - -static int max11802_sample(FAR struct max11802_dev_s *priv, - FAR struct max11802_sample_s *sample) -{ - irqstate_t flags; - int ret = -EAGAIN; - - /* Interrupts must 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 MAX11802 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 max11802_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: max11802_waitsample - ****************************************************************************/ - -static int max11802_waitsample(FAR struct max11802_dev_s *priv, - FAR struct max11802_sample_s *sample) -{ - irqstate_t flags; - int ret; - - /* Interrupts must 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 (max11802_sample(priv, sample) < 0) - { - /* Wait for a change in the MAX11802 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 MAX11802 for some reason, the data - * might be read out of order. - */ - - sched_unlock(); - return ret; -} - -/**************************************************************************** - * Name: max11802_schedule - ****************************************************************************/ - -static int max11802_schedule(FAR struct max11802_dev_s *priv) -{ - FAR struct max11802_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. MAX11802 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 MAX11802 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(HPWORK, &priv->work, max11802_worker, priv, 0); - if (ret != 0) - { - illdbg("Failed to queue work: %d\n", ret); - } - - return OK; -} - -/**************************************************************************** - * Name: max11802_wdog - ****************************************************************************/ - -static void max11802_wdog(int argc, uint32_t arg1, ...) -{ - FAR struct max11802_dev_s *priv = (FAR struct max11802_dev_s *)((uintptr_t)arg1); - (void)max11802_schedule(priv); -} - -/**************************************************************************** - * Name: max11802_worker - ****************************************************************************/ - -static void max11802_worker(FAR void *arg) -{ - FAR struct max11802_dev_s *priv = (FAR struct max11802_dev_s *)arg; - FAR struct max11802_config_s *config; - uint16_t x; - uint16_t y; - uint16_t xdiff; - uint16_t ydiff; - bool pendown; - int ret; - int tags, tags2; - - 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. This is safe because it is started only - * by this function and this function is serialized on the worker thread. - */ - - wd_cancel(priv->wdog); - - /* Lock the SPI bus so that we have exclusive access */ - - max11802_lock(priv->spi); - - /* Start coordinate measurement */ - (void)max11802_sendcmd(priv, MAX11802_CMD_MEASUREXY, &tags); - - /* Get exclusive access to the driver data structure */ - - do - { - ret = sem_wait(&priv->devsem); - - /* This should only fail if the wait was canceled by an signal - * (and the worker thread will receive a lot of signals). - */ - - DEBUGASSERT(ret == OK || errno == EINTR); - } - while (ret < 0); - - /* 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) - ivdbg("\nPD\n"); - else - ivdbg("\nPU\n"); - - if (!pendown) - { - /* The pen is up.. reset thresholding variables. */ - - priv->threshx = INVALID_THRESHOLD; - priv->threshy = INVALID_THRESHOLD; - - /* Ignore the interrupt if the pen was already up (CONTACT_NONE == pen up - * and already reported; CONTACT_UP == pen up, but not reported) - */ - - ivdbg("\nPC%d\n", priv->sample.contact); - - if (priv->sample.contact == CONTACT_NONE || - priv->sample.contact == CONTACT_UP) - - { - goto ignored; - } - - /* 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) - { - /* 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 we will set the timer to to sample again - * later. - */ - - ivdbg("Previous pen up event still in buffer\n"); - max11802_notify(priv); - wd_start(priv->wdog, MAX11802_WDOG_DELAY, max11802_wdog, 1, (uint32_t)priv); - goto ignored; - } - else - { - /* Wait for data ready */ - do { - /* Handle pen down events. First, sample positional values. */ - -#ifdef CONFIG_MAX11802_SWAPXY - x = max11802_sendcmd(priv, MAX11802_CMD_YPOSITION, &tags); - y = max11802_sendcmd(priv, MAX11802_CMD_XPOSITION, &tags2); -#else - x = max11802_sendcmd(priv, MAX11802_CMD_XPOSITION, &tags); - y = max11802_sendcmd(priv, MAX11802_CMD_YPOSITION, &tags2); -#endif - } while (tags == 0xF || tags2 == 0xF); - - /* Continue to sample the position while the pen is down */ - wd_start(priv->wdog, MAX11802_WDOG_DELAY, max11802_wdog, 1, (uint32_t)priv); - - /* Check if data is valid */ - if ((tags & 0x03) != 0) - { - ivdbg("Touch ended before measurement\n"); - 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); - - /* Check the thresholds. Bail if there is no significant difference */ - - if (xdiff < CONFIG_MAX11802_THRESHX && ydiff < CONFIG_MAX11802_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; - - /* 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; - } - } - - /* Indicate the availability of new sample data for this ID */ - - priv->sample.id = priv->id; - priv->penchange = true; - - /* Notify any waiters that new MAX11802 data is available */ - - max11802_notify(priv); - -ignored: - config->enable(config, true); - - /* Release our lock on the state structure and unlock the SPI bus */ - - sem_post(&priv->devsem); - max11802_unlock(priv->spi); -} - -/**************************************************************************** - * Name: max11802_interrupt - ****************************************************************************/ - -static int max11802_interrupt(int irq, FAR void *context) -{ - FAR struct max11802_dev_s *priv; - FAR struct max11802_config_s *config; - int ret; - - /* Which MAX11802 device caused the interrupt? */ - -#ifndef CONFIG_MAX11802_MULTIPLE - priv = &g_max11802; -#else - for (priv = g_max11802list; - 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 = max11802_schedule(priv); - - /* Clear any pending interrupts and return success */ - - config->clear(config); - return ret; -} - -/**************************************************************************** - * Name: max11802_open - ****************************************************************************/ - -static int max11802_open(FAR struct file *filep) -{ -#ifdef CONFIG_MAX11802_REFCNT - FAR struct inode *inode; - FAR struct max11802_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 max11802_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: max11802_close - ****************************************************************************/ - -static int max11802_close(FAR struct file *filep) -{ -#ifdef CONFIG_MAX11802_REFCNT - FAR struct inode *inode; - FAR struct max11802_dev_s *priv; - int ret; - - ivdbg("Closing\n"); - DEBUGASSERT(filep); - inode = filep->f_inode; - - DEBUGASSERT(inode && inode->i_private); - priv = (FAR struct max11802_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: max11802_read - ****************************************************************************/ - -static ssize_t max11802_read(FAR struct file *filep, FAR char *buffer, size_t len) -{ - FAR struct inode *inode; - FAR struct max11802_dev_s *priv; - FAR struct touch_sample_s *report; - struct max11802_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 max11802_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 = max11802_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 = max11802_waitsample(priv, &sample); - if (ret < 0) - { - /* We might have been awakened by a signal */ - - idbg("max11802_waitsample: %d\n", ret); - goto errout; - } - } - - /* In any event, we now have sampled MAX11802 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 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; - } - 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:max11802_ioctl - ****************************************************************************/ - -static int max11802_ioctl(FAR struct file *filep, int cmd, unsigned long arg) -{ - FAR struct inode *inode; - FAR struct max11802_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 max11802_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: max11802_poll - ****************************************************************************/ - -#ifndef CONFIG_DISABLE_POLL -static int max11802_poll(FAR struct file *filep, FAR struct pollfd *fds, - bool setup) -{ - FAR struct inode *inode; - FAR struct max11802_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 max11802_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_MAX11802_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_MAX11802_NPOLLWAITERS) - { - fds->priv = NULL; - ret = -EBUSY; - goto errout; - } - - /* Should we immediately notify on any of the requested events? */ - - if (priv->penchange) - { - max11802_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: max11802_register - * - * Description: - * Configure the MAX11802 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 max11802_register(FAR struct spi_dev_s *spi, - FAR struct max11802_config_s *config, int minor) -{ - FAR struct max11802_dev_s *priv; - char devname[DEV_NAMELEN]; -#ifdef CONFIG_MAX11802_MULTIPLE - irqstate_t flags; -#endif - int ret; - - ivdbg("spi: %p minor: %d\n", spi, minor); - - /* Debug-only sanity checks */ - - DEBUGASSERT(spi != NULL && config != NULL && minor >= 0 && minor < 100); - - /* Create and initialize a MAX11802 device driver instance */ - -#ifndef CONFIG_MAX11802_MULTIPLE - priv = &g_max11802; -#else - priv = (FAR struct max11802_dev_s *)kmalloc(sizeof(struct max11802_dev_s)); - if (!priv) - { - idbg("kmalloc(%d) failed\n", sizeof(struct max11802_dev_s)); - return -ENOMEM; - } -#endif - - /* Initialize the MAX11802 device driver instance */ - - memset(priv, 0, sizeof(struct max11802_dev_s)); - priv->spi = spi; /* Save the SPI device handle */ - priv->config = config; /* Save the board configuration */ - priv->wdog = wd_create(); /* Create a watchdog timer */ - priv->threshx = INVALID_THRESHOLD; /* Initialize thresholding logic */ - priv->threshy = INVALID_THRESHOLD; /* Initialize thresholding logic */ - - 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, max11802_interrupt); - if (ret < 0) - { - idbg("Failed to attach interrupt\n"); - goto errout_with_priv; - } - - idbg("Mode: %d Bits: 8 Frequency: %d\n", - CONFIG_MAX11802_SPIMODE, CONFIG_MAX11802_FREQUENCY); - - /* Lock the SPI bus so that we have exclusive access */ - - max11802_lock(spi); - - /* Configure the SPI interface */ - - max11802_configspi(spi); - - /* Configure MAX11802 registers */ - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, true); - (void)SPI_SEND(priv->spi, MAX11802_CMD_MODE_WR); - (void)SPI_SEND(priv->spi, MAX11802_MODE); - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, false); - - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, true); - (void)SPI_SEND(priv->spi, MAX11802_CMD_AVG_WR); - (void)SPI_SEND(priv->spi, MAX11802_AVG); - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, false); - - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, true); - (void)SPI_SEND(priv->spi, MAX11802_CMD_TIMING_WR); - (void)SPI_SEND(priv->spi, MAX11802_TIMING); - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, false); - - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, true); - (void)SPI_SEND(priv->spi, MAX11802_CMD_DELAY_WR); - (void)SPI_SEND(priv->spi, MAX11802_DELAY); - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, false); - - /* Test that the device access was successful. */ - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, true); - (void)SPI_SEND(priv->spi, MAX11802_CMD_MODE_RD); - ret = SPI_SEND(priv->spi, 0); - SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, false); - - /* Unlock the bus */ - max11802_unlock(spi); - - if (ret != MAX11802_MODE) - { - idbg("max11802 mode readback failed: %02x\n", ret); - goto errout_with_priv; - } - - /* Register the device as an input device */ - - (void)snprintf(devname, DEV_NAMELEN, DEV_FORMAT, minor); - ivdbg("Registering %s\n", devname); - - ret = register_driver(devname, &max11802_fops, 0666, priv); - if (ret < 0) - { - idbg("register_driver() failed: %d\n", ret); - goto errout_with_priv; - } - - /* If multiple MAX11802 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_MAX11802_MULTIPLE - priv->flink = g_max11802list; - g_max11802list = priv; - irqrestore(flags); -#endif - - /* Schedule work to perform the initial sampling and to set the data - * availability conditions. - */ - - ret = work_queue(HPWORK, &priv->work, max11802_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_MAX11802_MULTIPLE - kfree(priv); -#endif - return ret; -} |