/****************************************************************************
* drivers/input/tsc2007.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* References:
* "1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire Micro TOUCH SCREEN CONTROLLER
* with I2C Interface," SBAS405A March 2007, Revised, March 2009, Texas
* Instruments Incorporated
*
* 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 <semaphore.h>
#include <poll.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/arch.h>
#include <nuttx/fs.h>
#include <nuttx/i2c.h>
#include <nuttx/input/tsc2007.h>
#include "tsc2007.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Driver support ***********************************************************/
/* This format is used to construct the /dev/skel[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
****************************************************************************/
struct tsc2007_dev_s
{
uint8_t crefs; /* Number of times the device has been opened */
sem_t devsem; /* Manages exclusive access to this structure */
FAR struct tsc2007_config_s *config; /* Board configuration data */
FAR struct i2c_dev_s *i2c; /* Saved I2C driver instance */
/* 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_TSC2007_NPOLLWAITERS];
#endif
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static void tsc2007_pollnotify(FAR struct tsc2007_dev_s *priv,
pollevent_t eventset);
#endif
static int tsc2007_transfer(FAR struct tsc2007_dev_s *priv, uint8_t cmd);
static void tsc2007_sample(FAR struct tsc2007_dev_s *tsc,
FAR struct tsc2007_sample_s *sample);
static int tsc2007_interrupt(int irq, FAR void *context);
/* Character driver methods */
static int tsc2007_open(FAR struct file *filep);
static int tsc2007_close(FAR struct file *filep);
static ssize_t tsc2007_read(FAR struct file *filep, FAR char *buffer, size_t len);
static ssize_t tsc2007_write(FAR struct file *filep, FAR const char *buffer, size_t len);
static int tsc2007_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
#ifndef CONFIG_DISABLE_POLL
static int tsc2007_poll(FAR struct file *filep, struct pollfd *fds, bool setup);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations tsc2007_fops =
{
tsc2007_open, /* open */
tsc2007_close, /* close */
tsc2007_read, /* read */
tsc2007_write, /* write */
0, /* seek */
tsc2007_ioctl /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, tsc2007_poll /* poll */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: tsc2007_pollnotify
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static void tsc2007_pollnotify(FAR struct tsc2007_dev_s *priv,
pollevent_t eventset)
{
int i;
for (i = 0; i < CONFIG_TSC2007_NPOLLWAITERS; i++)
{
struct pollfd *fds = priv->fds[i];
if (fds)
{
fds->revents |= (fds->events & eventset);
if (fds->revents != 0)
{
ivdbg("Report events: %02x\n", fds->revents);
sem_post(fds->sem);
}
}
}
}
#else
# define tsc2007_pollnotify(priv,event)
#endif
/****************************************************************************
* Name: tsc2007_transfer
****************************************************************************/
static int tsc2007_transfer(FAR struct tsc2007_dev_s *priv, uint8_t cmd)
{
struct i2c_msg_s msg;
uint8_t data12[2];
int ret;
/* "A conversion/write cycle begins when the master issues the address
* byte containing the slave address of the TSC2007, with the eighth bit
* equal to a 0 (R/W = 0)... Once the eighth bit has been received...
* the TSC2007 issues an acknowledge.
*
* "When the master receives the acknowledge bit from the TSC2007, the
* master writes the command byte to the slave... After the command byte
* is received by the slave, the slave issues another acknowledge bit.
* The master then ends the write cycle by issuing a repeated START or a
* STOP condition...
*/
msg.addr = priv->config->address; /* 7-bit address */
msg.flags = 0; /* Write transaction, beginning with START */
msg.buffer = &cmd; /* Transfer from this address */
msg.length = 1; /* Send one byte following the address */
ret = I2C_TRANSFER(priv->i2c, &msg, 1);
if (ret < 0)
{
idbg("I2C_TRANSFER failed: %d\n", ret);
return ret;
}
/* "The input multiplexer channel for the A/D converter is selected when
* bits C3 through C0 are clocked in. If the selected channel is an X-,Y-,
* or Z-position measurement, the appropriate drivers turn on once the
* acquisition period begins.
*
* "... the input sample acquisition period starts on the falling edge of
* SCL when the C0 bit of the command byte has been latched, and ends
* when a STOP or repeated START condition has been issued. A/D conversion
* starts immediately after the acquisition period...
*
* "For best performance, the I2C bus should remain in an idle state while
* an A/D conversion is taking place. ... The master should wait for at
* least 10ms before attempting to read data from the TSC2007...
*/
usleep(10*1000);
/* "Data access begins with the master issuing a START condition followed
* by the address byte ... with R/W = 1.
*
* "When the eighth bit has been received and the address matches, the
* slave issues an acknowledge. The first byte of serial data then follows
* (D11-D4, MSB first).
*
* "After the first byte has been sent by the slave, it releases the SDA line
* for the master to issue an acknowledge. The slave responds with the
* second byte of serial data upon receiving the acknowledge from the master
* (D3-D0, followed by four 0 bits). The second byte is followed by a NOT
* acknowledge bit (ACK = 1) from the master to indicate that the last
* data byte has been received...
*/
msg.addr = priv->config->address; /* 7-bit address */
msg.flags = I2C_M_READ; /* Read transaction, beginning with START */
msg.buffer = data12; /* Transfer two this address */
msg.length = 2; /* Read two bytes following the address */
ret = I2C_TRANSFER(priv->i2c, &msg, 1);
if (ret < 0)
{
idbg("I2C_TRANSFER failed: %d\n", ret);
return ret;
}
ret = (unsigned int)data12[0] << 4 | (unsigned int)data12[1];
ivdbg(&tsc->client->dev, "data: 0x%03x\n", ret);
return ret;
}
/****************************************************************************
* Name: tsc2007_sample
****************************************************************************/
static void tsc2007_sample(FAR struct tsc2007_dev_s *tsc,
FAR struct tsc2007_sample_s *sample)
{
/* ADC is on... Disable interrupts and read Y and X positions */
sample->y = tsc2007_transfer(tsc, (TSC2007_CMD_12BIT | TSC2007_CMD_ADCON_IRQDIS | TSC2007_CMD_FUNC_YPOS));
sample->x = tsc2007_transfer(tsc, (TSC2007_CMD_12BIT | TSC2007_CMD_ADCON_IRQDIS | TSC2007_CMD_FUNC_XPOS));
/* Read Z1 and Z2 positions */
sample->z1 = tsc2007_transfer(tsc, (TSC2007_CMD_12BIT | TSC2007_CMD_ADCON_IRQDIS | TSC2007_CMD_FUNC_Z1POS));
sample->z2 = tsc2007_transfer(tsc, (TSC2007_CMD_12BIT | TSC2007_CMD_ADCON_IRQDIS | TSC2007_CMD_FUNC_Z2POS));
/* Power down ADC and enable PENIRQ */
(void)tsc2007_transfer(tsc, (TSC2007_CMD_12BIT | TSC2007_CMD_PWRDN_IRQEN));
}
/****************************************************************************
* Name: tsc2007_interrupt
****************************************************************************/
static int tsc2007_interrupt(int irq, FAR void *context)
{
# warning "Missing logic"
return -ENOSYS;
}
/****************************************************************************
* Name: tsc2007_open
****************************************************************************/
static int tsc2007_open(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct tsc2007_dev_s *priv;
uint8_t tmp;
int ret;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct tsc2007_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;
}
/* Check if this is the first time that the driver has been opened. */
if (tmp == 1)
{
irqstate_t flags = irqsave();
/* Perform one time hardware initialization */
#warning "Missing logic"
irqrestore(flags);
}
/* Save the new open count on success */
priv->crefs = tmp;
errout_with_sem:
sem_post(&priv->devsem);
return ret;
}
/****************************************************************************
* Name: tsc2007_close
****************************************************************************/
static int tsc2007_close(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct tsc2007_dev_s *priv;
int ret;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct tsc2007_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 to zero */
if (priv->crefs > 1)
{
priv->crefs--;
sem_post(&priv->devsem);
return OK;
}
/* There are no more references to the port */
priv->crefs = 0;
/* Perform driver teardown */
#warning "Missing logic"
sem_post(&priv->devsem);
return OK;
}
/****************************************************************************
* Name: tsc2007_read
****************************************************************************/
static ssize_t tsc2007_read(FAR struct file *filep, FAR char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct tsc2007_dev_s *priv;
int ret;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct tsc2007_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;
}
#warning "Not implemented"
sem_post(&priv->devsem);
return -ENOSYS;
}
/****************************************************************************
* Name: tsc2007_write
****************************************************************************/
static ssize_t tsc2007_write(FAR struct file *filep, FAR const char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct tsc2007_dev_s *priv;
int ret;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct tsc2007_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;
}
#warning "Not implemented"
sem_post(&priv->devsem);
return -ENOSYS;
}
/****************************************************************************
* Name:tsc2007_ioctl
****************************************************************************/
static int tsc2007_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode;
FAR struct tsc2007_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 tsc2007_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)
{
/* Add support for ioctl commands here */
default:
ret = -ENOTTY;
break;
}
sem_post(&priv->devsem);
return ret;
}
/****************************************************************************
* Name: tsc2007_poll
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static int tsc2007_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup)
{
FAR struct inode *inode;
FAR struct tsc2007_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 tsc2007_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)
{
/* This is a request to set up the poll. Find an available
* slot for the poll structure reference
*/
for (i = 0; i < CONFIG_TSC2007_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_TSC2007_NPOLLWAITERS)
{
fds->priv = NULL;
ret = -EBUSY;
goto errout;
}
/* Should immediately notify on any of the requested events? */
#warning "Missing logic"
}
else if (fds->priv)
{
/* This is a request to tear down the poll. */
struct pollfd **slot = (struct pollfd **)fds->priv;
#ifdef CONFIG_DEBUG
if (!slot)
{
ret = -EIO;
goto errout;
}
#endif
/* 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: tsc2007_register
*
* Description:
* Configure the TSC2007 to use the provided I2C device instance. This
* will register the driver as /dev/inputN where N is the minor device
* number
*
* Input Parameters:
* dev - An I2C driver instance
* config - Persistant 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 tsc2007_register(FAR struct i2c_dev_s *dev,
FAR struct tsc2007_config_s *config, int minor)
{
FAR struct tsc2007_dev_s *priv;
char devname[DEV_NAMELEN];
int ret;
ivdbg("dev: %p minor: %d\n", dev, minor);
DEBUGASSERT(dev != NULL && config != NULL && minor > 0 && minor < 100);
DEBUGASSERT((config->address & 0xfc) == 0x48);
/* Create and initialize a TSC2007 device driver instance */
priv = (FAR struct tsc2007_dev_s *)kmalloc(sizeof(struct tsc2007_dev_s));
if (!priv)
{
idbg("kmalloc(%d) failed\n", sizeof(struct tsc2007_dev_s));
return -ENOMEM;
}
/* Initialize the TSC2007 device driver instance */
memset(priv, 0, sizeof(struct tsc2007_dev_s));
priv->i2c = dev; /* Save the I2C device handle */
priv->config = config; /* Save the board configuration */
sem_init(&priv->devsem, 0, 1); /* Initialize device structure semaphore */
/* Attach the interrupt handler */
ret = config->attach(config, tsc2007_interrupt);
if (ret < 0)
{
idbg("Failed to attach interrupt\n");
goto errout_with_priv;
}
/* Power down the ADC and enable PENIRQ. This is the normal state while
* waiting for a touch event.
*/
ret = tsc2007_transfer(priv, (TSC2007_CMD_12BIT | TSC2007_CMD_PWRDN_IRQEN));
if (ret < 0)
{
idbg("tsc2007_transfer failed: %d\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, &tsc2007_fops, 0666, priv);
if (ret < 0)
{
idbg("register_driver() failed: %d\n", ret);
goto errout_with_priv;
}
/* Enable the interrupt */
ret = config->enable(config, true);
if (ret < 0)
{
idbg("Failed enable interrupt\n");
goto errout_with_priv;
}
return ret;
errout_with_priv:
sem_destroy(&priv->devsem);
kfree(priv);
return ret;
}
