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nuttx/arch/sim/src/up_touchscreen.c

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/****************************************************************************
* arch/sim/src/up_touchscreen.c
*
* Copyright (C) 2011-2012, 2016 Gregory Nutt. All rights reserved.
* Author: 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 <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <semaphore.h>
#include <poll.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/board.h>
#include <nuttx/kmalloc.h>
#include <nuttx/arch.h>
#include <nuttx/fs/fs.h>
#include <nuttx/nx/nx.h>
#include <nuttx/input/touchscreen.h>
#include "up_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifdef CONFIG_DISABLE_POLL
# undef CONFIG_SIM_TCNWAITERS
#else
# ifndef CONFIG_SIM_TCNWAITERS
# define CONFIG_SIM_TCNWAITERS 4
# endif
#endif
/* 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
/****************************************************************************
* Private Types
****************************************************************************/
/* This describes the state of one contact */
enum up_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 touchscreen sample */
struct up_sample_s
{
uint8_t id; /* Sampled touch point ID */
uint8_t contact; /* Contact state (see enum up_contact_e) */
uint16_t x; /* Measured X position */
uint16_t y; /* Measured Y position */
};
/* This structure describes the state of one touchscreen driver instance */
struct up_dev_s
{
volatile uint8_t nwaiters; /* Number of threads waiting for touchscreen data */
uint8_t id; /* Current touch point ID */
uint8_t minor; /* Minor device number */
volatile bool penchange; /* An unreported event is buffered */
sem_t devsem; /* Manages exclusive access to this structure */
sem_t waitsem; /* Used to wait for the availability of data */
struct up_sample_s sample; /* Last sampled touch point data */
/* 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_SIM_TCNWAITERS];
#endif
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void up_notify(FAR struct up_dev_s *priv);
static int up_sample(FAR struct up_dev_s *priv,
FAR struct up_sample_s *sample);
static int up_waitsample(FAR struct up_dev_s *priv,
FAR struct up_sample_s *sample);
/* Character driver methods */
static int up_open(FAR struct file *filep);
static int up_close(FAR struct file *filep);
static ssize_t up_read(FAR struct file *filep, FAR char *buffer, size_t len);
static int up_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
#ifndef CONFIG_DISABLE_POLL
static int up_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 up_fops =
{
up_open, /* open */
up_close, /* close */
up_read, /* read */
0, /* write */
0, /* seek */
up_ioctl /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, up_poll /* poll */
#endif
};
/* Only one simulated touchscreen is supported so the driver state
* structure may as well be pre-allocated.
*/
static struct up_dev_s g_simtouchscreen;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_notify
****************************************************************************/
static void up_notify(FAR struct up_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.
*/
iinfo("contact=%d nwaiters=%d\n", priv->sample.contact, priv->nwaiters);
if (priv->nwaiters > 0)
{
/* After posting this semaphore, we need to exit because the touchscreen
* is no longer avaialable.
*/
sem_post(&priv->waitsem);
}
/* If there are threads waiting on poll() for touchscreen data to become availabe,
* 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_SIM_TCNWAITERS; i++)
{
struct pollfd *fds = priv->fds[i];
if (fds)
{
fds->revents |= POLLIN;
iinfo("Report events: %02x\n", fds->revents);
sem_post(fds->sem);
}
}
#endif
}
/****************************************************************************
* Name: up_sample
****************************************************************************/
static int up_sample(FAR struct up_dev_s *priv,
FAR struct up_sample_s *sample)
{
int ret = -EAGAIN;
/* Is there new touchscreen sample data available? */
iinfo("penchange=%d contact=%d id=%d\n",
priv->penchange, sample->contact, priv->id);
if (priv->penchange)
{
/* Yes.. the state has changed in some way. Return a copy of the
* sampled data.
*/
memcpy(sample, &priv->sample, sizeof(struct up_sample_s));
/* Now manage state transitions */
if (sample->contact == CONTACT_UP)
{
/* Next.. no contract. Increment the ID so that next contact ID will be unique */
priv->sample.contact = CONTACT_NONE;
priv->id++;
}
else if (sample->contact == CONTACT_DOWN)
{
/* First report -- next report will be a movement */
priv->sample.contact = CONTACT_MOVE;
}
priv->penchange = false;
iinfo("penchange=%d contact=%d id=%d\n",
priv->penchange, priv->sample.contact, priv->id);
ret = OK;
}
return ret;
}
/****************************************************************************
* Name: up_waitsample
****************************************************************************/
static int up_waitsample(FAR struct up_dev_s *priv,
FAR struct up_sample_s *sample)
{
irqstate_t flags;
int ret;
/* Interrupts me be disabled when this is called to (1) prevent posting
* of semphores 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.
*/
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 (up_sample(priv, sample) < 0)
{
/* Wait for a change in the touchscreen state */
iinfo("Waiting...\n");
priv->nwaiters++;
ret = sem_wait(&priv->waitsem);
priv->nwaiters--;
iinfo("Awakened...\n");
if (ret < 0)
{
/* If we are awakened by a signal, then we need to return
* the failure now.
*/
DEBUGASSERT(errno == EINTR);
ret = -EINTR;
goto errout;
}
}
/* 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.
*/
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 touchscreen for some reason, the data
* might be read out of order.
*/
sched_unlock();
return ret;
}
/****************************************************************************
* Name: up_open
****************************************************************************/
static int up_open(FAR struct file *filep)
{
iinfo("Opening...\n");
return OK;
}
/****************************************************************************
* Name: up_close
****************************************************************************/
static int up_close(FAR struct file *filep)
{
iinfo("Closing...\n");
return OK;
}
/****************************************************************************
* Name: up_read
****************************************************************************/
static ssize_t up_read(FAR struct file *filep, FAR char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct up_dev_s *priv;
FAR struct touch_sample_s *report;
struct up_sample_s sample;
int ret;
iinfo("len=%d\n", len);
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct up_dev_s *)inode->i_private;
/* Verify that the caller has provided a buffer large enough to receive
* the touch data.
*/
if (len < SIZEOF_TOUCH_SAMPLE_S(1))
{
/* We could provide logic to break up a touch report into segments and
* handle smaller reads... but why?
*/
return -ENOSYS;
}
/* Get exclusive access to the driver data structure */
ret = sem_wait(&priv->devsem);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
DEBUGASSERT(errno == EINTR);
return -EINTR;
}
/* Try to read sample data. */
ret = up_sample(priv, &sample);
if (ret < 0)
{
/* Sample data is not available now. We would ave to wait to get
* receive sample data. If the user has specified the O_NONBLOCK
* option, then just return an error.
*/
if (filep->f_oflags & O_NONBLOCK)
{
ret = -EAGAIN;
goto errout;
}
/* Wait for sample data */
ret = up_waitsample(priv, &sample);
if (ret < 0)
{
/* We might have been awakened by a signal */
goto errout;
}
}
/* In any event, we now have sampled touchscreen data that we can report
* to the caller.
*/
report = (FAR struct touch_sample_s *)buffer;
memset(report, 0, SIZEOF_TOUCH_SAMPLE_S(1));
report->npoints = 1;
report->point[0].id = priv->id;
report->point[0].x = sample.x;
report->point[0].y = sample.y;
report->point[0].h = 1;
report->point[0].w = 1;
report->point[0].pressure = 42;
/* Report the appropriate flags */
if (sample.contact == CONTACT_UP)
{
/* Pen is now up */
report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID;
}
else if (sample.contact == CONTACT_DOWN)
{
/* First contact */
report->point[0].flags = TOUCH_DOWN | TOUCH_ID_VALID | TOUCH_POS_VALID | TOUCH_PRESSURE_VALID;
}
else /* if (sample->contact == CONTACT_MOVE) */
{
/* Movement of the same contact */
report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID | TOUCH_POS_VALID | TOUCH_PRESSURE_VALID;
}
ret = SIZEOF_TOUCH_SAMPLE_S(1);
errout:
iinfo("Returning %d\n", ret);
sem_post(&priv->devsem);
return ret;
}
/****************************************************************************
* Name:up_ioctl
****************************************************************************/
static int up_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode;
FAR struct up_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 up_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: up_poll
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static int up_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup)
{
FAR struct inode *inode;
FAR struct up_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 up_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->revents & 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_SIM_TCNWAITERS; 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_SIM_TCNWAITERS)
{
fds->priv = NULL;
ret = -EBUSY;
goto errout;
}
/* Should we immediately notify on any of the requested events? */
if (priv->penchange)
{
up_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: board_tsc_setup
*
* Description:
* Configure the simulated 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 board_tsc_setup(int minor)
{
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)&g_simtouchscreen;
char devname[DEV_NAMELEN];
int ret;
iinfo("minor: %d\n", minor);
/* Debug-only sanity checks */
DEBUGASSERT(minor >= 0 && minor < 100);
/* Initialize the touchscreen device driver instance */
memset(priv, 0, sizeof(struct up_dev_s));
sem_init(&priv->devsem, 0, 1); /* Initialize device structure semaphore */
sem_init(&priv->waitsem, 0, 0); /* Initialize pen event wait semaphore */
priv->minor = minor;
/* Register the device as an input device */
(void)snprintf(devname, DEV_NAMELEN, DEV_FORMAT, minor);
iinfo("Registering %s\n", devname);
ret = register_driver(devname, &up_fops, 0666, priv);
if (ret < 0)
{
ierr("ERROR: register_driver() failed: %d\n", ret);
goto errout_with_priv;
}
/* Enable X11 event processing from the IDLE loop */
g_eventloop = 1;
/* And return success */
return OK;
errout_with_priv:
sem_destroy(&priv->waitsem);
sem_destroy(&priv->devsem);
return ret;
}
/****************************************************************************
* Name: board_tsc_teardown
*
* Description:
* Uninitialized the simulated touchscreen
*
* Input Parameters:
* None
*
* Returned Value:
* None.
*
****************************************************************************/
void board_tsc_teardown(void)
{
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)&g_simtouchscreen;
char devname[DEV_NAMELEN];
int ret;
/* Get exclusive access */
do
{
ret = sem_wait(&priv->devsem);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
DEBUGASSERT(errno == EINTR);
}
}
while (ret != OK);
/* Stop the event loop (Hmm.. the caller must be sure that there are no
* open references to the touchscreen driver. This might better be
* done in close() using a reference count).
*/
g_eventloop = 0;
/* Un-register the device */
(void)snprintf(devname, DEV_NAMELEN, DEV_FORMAT, priv->minor);
iinfo("Un-registering %s\n", devname);
ret = unregister_driver(devname);
if (ret < 0)
{
ierr("ERROR: uregister_driver() failed: %d\n", ret);
}
/* Clean up any resources. Ouch! While we are holding the semaphore? */
sem_destroy(&priv->waitsem);
sem_destroy(&priv->devsem);
}
/****************************************************************************
* Name: up_buttonevent
****************************************************************************/
int up_buttonevent(int x, int y, int buttons)
{
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)&g_simtouchscreen;
bool pendown; /* true: pen is down */
iinfo("x=%d y=%d buttons=%02x\n", x, y, buttons);
iinfo("contact=%d nwaiters=%d\n", priv->sample.contact, priv->nwaiters);
/* Any button press will count as pendown. */
pendown = (buttons != 0);
/* Handle the change from pen down to pen up */
if (!pendown)
{
/* Ignore the pend up 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)
{
return OK;
}
/* Not yet reported */
priv->sample.contact = CONTACT_UP;
}
else
{
/* Save the measurements */
priv->sample.x = x;
priv->sample.y = y;
/* Note the availability of new measurements */
/* 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 touchscreen data is available */
up_notify(priv);
return OK;
}
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