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-rw-r--r--nuttx/arch/arm/src/sama5/sam_touchscreen.c965
1 files changed, 965 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/sama5/sam_touchscreen.c b/nuttx/arch/arm/src/sama5/sam_touchscreen.c
new file mode 100644
index 000000000..3dcdac21f
--- /dev/null
+++ b/nuttx/arch/arm/src/sama5/sam_touchscreen.c
@@ -0,0 +1,965 @@
+/****************************************************************************
+ * arch/arm/src/sama5/sam_touchsreen.c
+ *
+ * Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ * Authors: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <string.h>
+#include <semaphore.h>
+#include <poll.h>
+#include <wdog.h>
+#include <errno.h>
+#include <assert.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/wqueue.h>
+
+#include <nuttx/input/touchscreen.h>
+
+#include "sam_touchscreen.h"
+
+#if defined(CONFIG_SAMA5_ADC) && defined(CONFIG_SAMA5_TOUCHSCREEN)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+/* Driver support ***********************************************************/
+/* This format is used to construct the /dev/input[n] device driver path. It
+ * defined here so that it will be used consistently in all places.
+ */
+
+#define DEV_FORMAT "/dev/input%d"
+#define DEV_NAMELEN 16
+
+/* Poll the pen position while the pen is down at this rate (50MS): */
+
+#define TSD_WDOG_DELAY ((50 + (MSEC_PER_TICK-1))/ MSEC_PER_TICK)
+
+/* 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
+ ****************************************************************************/
+
+/* This describes the state of one contact */
+
+enum sam_contact_3
+{
+ CONTACT_NONE = 0, /* No contact */
+ CONTACT_DOWN, /* First contact */
+ CONTACT_MOVE, /* Same contact, possibly different position */
+ CONTACT_UP, /* Contact lost */
+};
+
+/* This structure describes the results of one ADS7843E sample */
+
+struct sam_sample_s
+{
+ uint8_t id; /* Sampled touch point ID */
+ uint8_t contact; /* Contact state (see enum sam_contact_e) */
+ bool valid; /* True: x,y contain valid, sampled data */
+ uint16_t x; /* Measured X position */
+ uint16_t y; /* Measured Y position */
+};
+
+/* This structure describes the state of one ADS7843E driver instance */
+
+struct sam_dev_s
+{
+ uint8_t nwaiters; /* Number of threads waiting for ADS7843E data */
+ uint8_t id; /* Current touch point ID */
+ volatile bool penchange; /* An unreported event is buffered */
+ uint16_t threshx; /* Thresholding X value */
+ uint16_t threshy; /* Thresholding Y value */
+ sem_t devsem; /* Manages exclusive access to this structure */
+ sem_t waitsem; /* Used to wait for the availability of data */
+
+ struct work_s work; /* Supports the interrupt handling "bottom half" */
+ struct sam_sample_s sample; /* Last sampled touch point data */
+ WDOG_ID wdog; /* Poll the position while the pen is down */
+
+ /* The following is a list if poll structures of threads waiting for
+ * driver events. The 'struct pollfd' reference for each open is also
+ * retained in the f_priv field of the 'struct file'.
+ */
+
+#ifndef CONFIG_DISABLE_POLL
+ struct pollfd *fds[CONFIG_ADS7843E_NPOLLWAITERS];
+#endif
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/* Interrupt bottom half logic and data sampling */
+
+static void sam_notify(FAR struct sam_dev_s *priv);
+static int sam_sample(FAR struct sam_dev_s *priv,
+ FAR struct sam_sample_s *sample);
+static int sam_waitsample(FAR struct sam_dev_s *priv,
+ FAR struct sam_sample_s *sample);
+static void sam_bottomhalf(FAR void *arg);
+
+/* Character driver methods */
+
+static int sam_open(FAR struct file *filep);
+static int sam_close(FAR struct file *filep);
+static ssize_t sam_read(FAR struct file *filep, FAR char *buffer,
+ size_t len);
+static int sam_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
+#ifndef CONFIG_DISABLE_POLL
+static int sam_poll(FAR struct file *filep, struct pollfd *fds, bool setup);
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/* This the vtable that supports the character driver interface */
+
+static const struct file_operations g_tsdops =
+{
+ sam_open, /* open */
+ sam_close, /* close */
+ sam_read, /* read */
+ 0, /* write */
+ 0, /* seek */
+ sam_ioctl /* ioctl */
+#ifndef CONFIG_DISABLE_POLL
+ , sam_poll /* poll */
+#endif
+};
+
+/* The driver state structure is pre-allocated. */
+
+static struct sam_dev_s g_tsd;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_notify
+ ****************************************************************************/
+
+static void sam_notify(FAR struct sam_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_SAMA5_TSD_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: sam_sample
+ ****************************************************************************/
+
+static int sam_sample(FAR struct sam_dev_s *priv,
+ FAR struct sam_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 sam_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: sam_waitsample
+ ****************************************************************************/
+
+static int sam_waitsample(FAR struct sam_dev_s *priv,
+ FAR struct sam_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 (sam_sample(priv, sample) < 0)
+ {
+ /* Wait for a sample data */
+
+ 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 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 touchscreen ADC for some reason, the
+ * data might be read out of order.
+ */
+
+ sched_unlock();
+ return ret;
+}
+
+/****************************************************************************
+ * Name: sam_schedule
+ ****************************************************************************/
+
+static int sam_schedule(FAR struct sam_dev_s *priv)
+{
+ int ret;
+
+ /* Disable further interrupts. touchscreen ADC interrupts will be re-enabled
+ * after the worker thread executes.
+ */
+#warning "Missing logic"
+
+ /* 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 touchscreen ADC 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, sam_bottomhalf, priv, 0);
+ if (ret != 0)
+ {
+ illdbg("Failed to queue work: %d\n", ret);
+ }
+
+ return OK;
+}
+
+/****************************************************************************
+ * Name: sam_wdog
+ ****************************************************************************/
+
+static void sam_wdog(int argc, uint32_t arg1, ...)
+{
+ FAR struct sam_dev_s *priv = (FAR struct sam_dev_s *)((uintptr_t)arg1);
+ (void)sam_schedule(priv);
+}
+
+/****************************************************************************
+ * Name: sam_bottomhalf
+ ****************************************************************************/
+
+static void sam_bottomhalf(FAR void *arg)
+{
+ FAR struct sam_dev_s *priv = (FAR struct sam_dev_s *)arg;
+ uint16_t x;
+ uint16_t y;
+ uint16_t xdiff;
+ uint16_t ydiff;
+ bool pendown;
+ int ret;
+
+ ASSERT(priv != 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);
+
+ /* 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. */
+#warning Missing logic
+
+ /* Handle the change from pen down to pen up */
+
+ 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)
+ */
+
+ 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.
+ */
+
+ wd_start(priv->wdog, TSD_WDOG_DELAY, sam_wdog, 1, (uint32_t)priv);
+ goto ignored;
+ }
+ else
+ {
+ /* Handle pen down events. First, sample positional values. */
+#warning Missing logic
+
+ /* 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);
+
+ /* Continue to sample the position while the pen is down */
+
+ wd_start(priv->wdog, TSD_WDOG_DELAY, sam_wdog, 1, (uint32_t)priv);
+
+ /* Check the thresholds. Bail if there is no significant difference */
+
+ if (xdiff < CONFIG_SAMA5_TSD_THRESHX && ydiff < CONFIG_SAMA5_TSD_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 ADS7843E data is available */
+
+ sam_notify(priv);
+
+ /* Exit, re-enabling ADS7843E interrupts */
+
+ignored:
+
+ /* Re-enable the PENIRQ interrupts */
+#warning Missing logic
+
+ /* Re-enable the PENIRQ interrupt at the MCU's interrupt controller */
+#warning Missing logic
+
+ /* Release our lock on the state structure */
+
+ sem_post(&priv->devsem);
+}
+
+/****************************************************************************
+ * Name: sam_open
+ ****************************************************************************/
+
+static int sam_open(FAR struct file *filep)
+{
+ ivdbg("Opening\n");
+ return OK;
+}
+
+/****************************************************************************
+ * Name: sam_close
+ ****************************************************************************/
+
+static int sam_close(FAR struct file *filep)
+{
+ ivdbg("Closing\n");
+ return OK;
+}
+
+/****************************************************************************
+ * Name: sam_read
+ ****************************************************************************/
+
+static ssize_t sam_read(FAR struct file *filep, FAR char *buffer, size_t len)
+{
+ FAR struct inode *inode;
+ FAR struct sam_dev_s *priv;
+ FAR struct touch_sample_s *report;
+ struct sam_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 sam_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 = sam_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 = sam_waitsample(priv, &sample);
+ if (ret < 0)
+ {
+ /* We might have been awakened by a signal */
+
+ idbg("sam_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 = 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:sam_ioctl
+ ****************************************************************************/
+
+static int sam_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
+{
+ FAR struct inode *inode;
+ FAR struct sam_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 sam_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)
+ {
+ default:
+ ret = -ENOTTY;
+ break;
+ }
+
+ sem_post(&priv->devsem);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: sam_poll
+ ****************************************************************************/
+
+#ifndef CONFIG_DISABLE_POLL
+static int sam_poll(FAR struct file *filep, FAR struct pollfd *fds,
+ bool setup)
+{
+ FAR struct inode *inode;
+ FAR struct sam_dev_s *priv;
+ 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 sam_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_SAMA5_TSD_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_SAMA5_TSD_NPOLLWAITERS)
+ {
+ fds->priv = NULL;
+ ret = -EBUSY;
+ goto errout;
+ }
+
+ /* Should we immediately notify on any of the requested events? */
+
+ if (priv->penchange)
+ {
+ sam_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: sam_tsd_register
+ *
+ * Description:
+ * Configure the SAMA5 touchscreen. This will register the driver as
+ * /dev/inputN where N is the minor device number
+ *
+ * Input Parameters:
+ * 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 sam_tsd_register(int minor)
+{
+ FAR struct sam_dev_s *priv = &g_tsd;
+ char devname[DEV_NAMELEN];
+ int ret;
+
+ ivdbg("minor: %d\n", minor);
+
+ /* Debug-only sanity checks */
+
+ DEBUGASSERT(minor >= 0 && minor < 100);
+
+ /* Initialize the touchscreen device driver instance */
+
+ memset(priv, 0, sizeof(struct sam_dev_s));
+ 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 and clear any pending interrupts */
+#warning Missing logic
+
+ /* Attach the interrupt handler */
+#warning Missing logic
+
+ /* Enable the PEN IRQ */
+#warning Missing logic
+
+ /* Register the device as an input device */
+
+ (void)snprintf(devname, DEV_NAMELEN, DEV_FORMAT, minor);
+ ivdbg("Registering %s\n", devname);
+
+ ret = register_driver(devname, &g_tsdops, 0666, priv);
+ if (ret < 0)
+ {
+ idbg("register_driver() failed: %d\n", ret);
+ goto errout_with_priv;
+ }
+
+ /* Schedule work to perform the initial sampling and to set the data
+ * availability conditions.
+ */
+
+ ret = work_queue(HPWORK, &priv->work, sam_bottomhalf, 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);
+ sem_destroy(&priv->waitsem);
+ return ret;
+}
+
+/****************************************************************************
+ * Name: sam_tsd_interrupt
+ *
+ * Description:
+ * Handles ADC interrupts associated with touchscreen channels
+ *
+ * Input parmeters:
+ * None
+ *
+ * Returned Value:
+ * None
+ *
+ ****************************************************************************/
+
+void sam_tsd_interrupt(void)
+{
+ FAR struct sam_dev_s *priv = &g_tsd;
+ int ret;
+
+ /* Schedule sampling to occur on the worker thread */
+
+ ret = sam_schedule(priv);
+
+ /* Clear any pending interrupts and return success */
+#warning Missing logic
+ return ret;
+}
+
+#endif /* CONFIG_SAMA5_ADC && CONFIG_SAMA5_TOUCHSCREEN */
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-27 13:47:10 +0000