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nuttx/drivers/input/max11802.c
dongjiuzhu d452a05910 pollnotify: we should send poll events before semaphore incrementes. 
There is a good case on sim platform:
When we input some cmd and click enter key to start application in terminal,
this context will change to application from IDLE loop. Althrough entey key '\r'
has been received to recv buffer and complete post semaphore of reader, but
pollnotify may not be called because context change. So when application run
poll function, because no events happend and poll enter wait, context will
again change to IDLE loop, this pollnotify of IDLE loop will run to send poll
events, poll function of applicaton will wake up. It's wrong!

Change-Id: I812a889f2e90781a9c3cb4b0251cccc4d32bebd1
Signed-off-by: dongjiuzhu <dongjiuzhu1@xiaomi.com>
2020-10-26 08:27:09 -03:00

1298 lines
36 KiB
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/****************************************************************************
* drivers/input/max11802.c
*
* Copyright (C) 2011-2012, 2014-2017 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 <poll.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/wdog.h>
#include <nuttx/kmalloc.h>
#include <nuttx/wqueue.h>
#include <nuttx/fs/fs.h>
#include <nuttx/spi/spi.h>
#include <nuttx/random.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 guarantees a big difference on the
* first pendown (but can't overflow).
*/
#define INVALID_THRESHOLD 0x1000
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Low-level SPI helpers */
static void max11802_lock(FAR struct spi_dev_s *spi);
static void max11802_unlock(FAR struct spi_dev_s *spi);
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, FAR void *arg);
/* 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);
static int max11802_poll(FAR struct file *filep, struct pollfd *fds,
bool setup);
/****************************************************************************
* Private Data
****************************************************************************/
/* This 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 */
max11802_poll /* poll */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, 0 /* unlink */
#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
****************************************************************************/
/****************************************************************************
* Name: 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.
*
* Input Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void max11802_lock(FAR struct spi_dev_s *spi)
{
/* Lock the SPI bus because there are multiple devices competing for the
* SPI bus
*/
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_SETMODE(spi, CONFIG_MAX11802_SPIMODE);
SPI_SETBITS(spi, 8);
SPI_HWFEATURES(spi, 0);
SPI_SETFREQUENCY(spi, CONFIG_MAX11802_FREQUENCY);
}
/****************************************************************************
* Name: max11802_unlock
*
* Description:
* Un-lock the SPI bus after each transfer, possibly losing the current
* configuration if we are sharing the SPI bus with other devices
*
* Input Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void max11802_unlock(FAR struct spi_dev_s *spi)
{
/* Relinquish the SPI bus. */
SPI_LOCK(spi, false);
}
/****************************************************************************
* 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(0), true);
/* Send the command */
SPI_SEND(priv->spi, cmd);
/* Read the data */
SPI_RECVBLOCK(priv->spi, buffer, 2);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
result = ((uint16_t)buffer[0] << 8) | (uint16_t)buffer[1];
*tags = result & 0xf;
result >>= 4; /* Get rid of tags */
iinfo("cmd:%02x response:%04x\n", cmd, result);
return result;
}
/****************************************************************************
* Name: max11802_notify
****************************************************************************/
static void max11802_notify(FAR struct max11802_dev_s *priv)
{
int i;
/* 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.
*/
for (i = 0; i < CONFIG_MAX11802_NPOLLWAITERS; i++)
{
struct pollfd *fds = priv->fds[i];
if (fds)
{
fds->revents |= POLLIN;
iinfo("Report events: %02x\n", fds->revents);
nxsem_post(fds->sem);
}
}
/* 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.
*/
nxsem_post(&priv->waitsem);
}
}
/****************************************************************************
* 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 = enter_critical_section();
/* 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;
}
leave_critical_section(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 = enter_critical_section();
/* Now release the semaphore that manages mutually exclusive access to
* the device structure. This may cause other tasks to become ready to
* run, but they cannot run yet because pre-emption is disabled.
*/
nxsem_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 */
iinfo("Waiting..\n");
priv->nwaiters++;
ret = nxsem_wait(&priv->waitsem);
priv->nwaiters--;
if (ret < 0)
{
ierr("ERROR: nxsem_wait: %d\n", ret);
goto errout;
}
}
iinfo("Sampled\n");
/* Re-acquire the semaphore that manages mutually exclusive access to
* the device structure. We may have to wait here. But we have our
* sample. Interrupts and pre-emption will be re-enabled while we wait.
*/
ret = nxsem_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.
*/
leave_critical_section(flags);
/* Restore pre-emption. We might get suspended here but that is okay
* because we already have our sample. Note: this means that if there
* were two threads reading from the 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)
{
ierr("ERROR: Failed to queue work: %d\n", ret);
}
return OK;
}
/****************************************************************************
* Name: max11802_wdog
****************************************************************************/
static void max11802_wdog(wdparm_t arg)
{
FAR struct max11802_dev_s *priv =
(FAR struct max11802_dev_s *)arg;
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 tags;
int tags2;
DEBUGASSERT(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 */
max11802_sendcmd(priv, MAX11802_CMD_MEASUREXY, &tags);
/* Get exclusive access to the driver data structure */
do
{
ret = nxsem_wait_uninterruptible(&priv->devsem);
/* This would only fail if something canceled the worker thread?
* That is not expected.
*/
DEBUGASSERT(ret == OK || ret == -ECANCELED);
}
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)
{
iinfo("\nPD\n");
}
else
{
iinfo("\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).
*/
iinfo("\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 sample
* again later.
*/
iinfo("Previous pen up event still in buffer\n");
max11802_notify(priv);
wd_start(&priv->wdog, MAX11802_WDOG_DELAY,
max11802_wdog, (wdparm_t)priv);
goto ignored;
}
else
{
/* Wait for data ready
*
* Note: MAX11802 signals the readiness of the results using
* the lowest 4 bits of the result. However these are the
* last bits to be read out of the device. It appears that
* the hardware value can change in the middle of the readout,
* causing the upper bits to be still invalid even though lower
* bits indicate valid result.
*
* We work around this by reading the registers once more after
* the tags indicate they are ready.
*/
int readycount = 0;
do
{
#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
if (tags != 0xf && tags2 != 0xf)
{
readycount++;
}
}
while (readycount < 2);
add_ui_randomness((x << 16) | y);
/* Continue to sample the position while the pen is down */
wd_start(&priv->wdog, MAX11802_WDOG_DELAY,
max11802_wdog, (wdparm_t)priv);
/* Check if data is valid */
if ((tags & 0x03) != 0)
{
iinfo("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 */
nxsem_post(&priv->devsem);
max11802_unlock(priv->spi);
}
/****************************************************************************
* Name: max11802_interrupt
****************************************************************************/
static int max11802_interrupt(int irq, FAR void *context, FAR void *arg)
{
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);
DEBUGASSERT(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;
iinfo("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 = nxsem_wait(&priv->devsem);
if (ret < 0)
{
return ret;
}
/* 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:
nxsem_post(&priv->devsem);
return ret;
#else
iinfo("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;
iinfo("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 = nxsem_wait(&priv->devsem);
if (ret < 0)
{
return ret;
}
/* 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--;
}
nxsem_post(&priv->devsem);
#endif
iinfo("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;
iinfo("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?
*/
ierr("ERROR: Unsupported read size: %d\n", len);
return -ENOSYS;
}
/* Get exclusive access to the driver data structure */
ret = nxsem_wait(&priv->devsem);
if (ret < 0)
{
ierr("ERROR: nxsem_wait: %d\n", ret);
return ret;
}
/* 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.
*/
iinfo("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 */
ierr("ERROR: 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;
}
iinfo(" id: %d\n", report->point[0].id);
iinfo(" flags: %02x\n", report->point[0].flags);
iinfo(" x: %d\n", report->point[0].x);
iinfo(" y: %d\n", report->point[0].y);
ret = SIZEOF_TOUCH_SAMPLE_S(1);
errout:
nxsem_post(&priv->devsem);
iinfo("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;
iinfo("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 = nxsem_wait(&priv->devsem);
if (ret < 0)
{
return ret;
}
/* 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;
}
nxsem_post(&priv->devsem);
return ret;
}
/****************************************************************************
* Name: max11802_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;
int ret;
int i;
iinfo("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 = nxsem_wait(&priv->devsem);
if (ret < 0)
{
return ret;
}
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:
nxsem_post(&priv->devsem);
return ret;
}
/****************************************************************************
* 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;
iinfo("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 *)
kmm_malloc(sizeof(struct max11802_dev_s));
if (!priv)
{
ierr("ERROR: kmm_malloc(%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->threshx = INVALID_THRESHOLD; /* Initialize thresholding logic */
priv->threshy = INVALID_THRESHOLD; /* Initialize thresholding logic */
/* Initialize semaphores */
nxsem_init(&priv->devsem, 0, 1); /* Initialize device structure semaphore */
nxsem_init(&priv->waitsem, 0, 0); /* Initialize pen event wait semaphore */
/* The pen event semaphore is used for signaling and, hence, should not
* have priority inheritance enabled.
*/
nxsem_set_protocol(&priv->waitsem, SEM_PRIO_NONE);
/* 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)
{
ierr("ERROR: Failed to attach interrupt\n");
goto errout_with_priv;
}
iinfo("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 MAX11802 registers */
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
SPI_SEND(priv->spi, MAX11802_CMD_MODE_WR);
SPI_SEND(priv->spi, MAX11802_MODE);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
SPI_SEND(priv->spi, MAX11802_CMD_AVG_WR);
SPI_SEND(priv->spi, MAX11802_AVG);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
SPI_SEND(priv->spi, MAX11802_CMD_SAMPLE_WR);
SPI_SEND(priv->spi, MAX11802_SAMPLE);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
SPI_SEND(priv->spi, MAX11802_CMD_TIMING_WR);
SPI_SEND(priv->spi, MAX11802_TIMING);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
SPI_SEND(priv->spi, MAX11802_CMD_DELAY_WR);
SPI_SEND(priv->spi, MAX11802_DELAY);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
SPI_SEND(priv->spi, MAX11802_CMD_PULL_WR);
SPI_SEND(priv->spi, MAX11802_PULL);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
/* Test that the device access was successful. */
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
SPI_SEND(priv->spi, MAX11802_CMD_MODE_RD);
ret = SPI_SEND(priv->spi, 0);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
/* Unlock the bus */
max11802_unlock(spi);
if (ret != MAX11802_MODE)
{
ierr("ERROR: max11802 mode readback failed: %02x\n", ret);
goto errout_with_priv;
}
/* Register the device as an input device */
snprintf(devname, DEV_NAMELEN, DEV_FORMAT, minor);
iinfo("Registering %s\n", devname);
ret = register_driver(devname, &max11802_fops, 0666, priv);
if (ret < 0)
{
ierr("ERROR: 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 received IRQ number.
*/
#ifdef CONFIG_MAX11802_MULTIPLE
flags = enter_critical_section();
priv->flink = g_max11802list;
g_max11802list = priv;
leave_critical_section(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)
{
ierr("ERROR: Failed to queue work: %d\n", ret);
goto errout_with_priv;
}
/* And return success (?) */
return OK;
errout_with_priv:
nxsem_destroy(&priv->devsem);
#ifdef CONFIG_MAX11802_MULTIPLE
kmm_free(priv);
#endif
return ret;
}
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