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nuttx/drivers/input/stmpe811_base.c

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/****************************************************************************
* drivers/input/stmpe811_base.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References:
* "STMPE811 S-Touch® advanced resistive touchscreen controller with 8-bit
* GPIO expander," Doc ID 14489 Rev 6, CD00186725, STMicroelectronics"
*
* 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 <unistd.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/input/stmpe811.h>
#include "stmpe811.h"
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811)
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/* If only a single STMPE811 device is supported, then the driver state
* structure may as well be pre-allocated.
*/
#ifndef CONFIG_STMPE811_MULTIPLE
static struct stmpe811_dev_s g_stmpe811;
/* Otherwise, we will need to maintain allocated driver instances in a list */
#else
static struct stmpe811_dev_s *g_stmpe811list;
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stmpe811_worker
*
* Description:
* This is the "bottom half" of the STMPE811 interrupt handler
*
****************************************************************************/
static void stmpe811_worker(FAR void *arg)
{
FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)arg;
uint8_t regval;
DEBUGASSERT(priv && priv->config);
/* Get the global interrupt status */
regval = stmpe811_getreg8(priv, STMPE811_INT_STA);
/* Check for a touchscreen interrupt */
#ifndef CONFIG_STMPE811_TSC_DISABLE
if ((regval & (INT_TOUCH_DET | INT_FIFO_TH | INT_FIFO_OFLOW)) != 0)
{
/* Dispatch the touchscreen interrupt if it was brought into the link */
#ifdef CONFIG_HAVE_WEAKFUNCTIONS
if (stmpe811_tscworker)
#endif
{
stmpe811_tscworker(priv, regval);
}
stmpe811_putreg8(priv, STMPE811_INT_STA,
(INT_TOUCH_DET | INT_FIFO_TH | INT_FIFO_OFLOW));
regval &= ~(INT_TOUCH_DET | INT_FIFO_TH | INT_FIFO_OFLOW);
}
#endif
#if !defined(CONFIG_STMPE811_GPIO_DISABLE) && !defined(CONFIG_STMPE811_GPIOINT_DISABLE)
if ((regval & INT_GPIO) != 0)
{
/* Dispatch the GPIO interrupt if it was brought into the link */
#ifdef CONFIG_HAVE_WEAKFUNCTIONS
if (stmpe811_gpioworker)
#endif
{
stmpe811_gpioworker(priv);
}
stmpe811_putreg8(priv, STMPE811_INT_STA, INT_GPIO);
regval &= ~INT_GPIO;
}
#endif
/* Clear any other residual, unhandled pending interrupt */
if (regval != 0)
{
stmpe811_putreg8(priv, STMPE811_INT_STA, regval);
}
/* Re-enable the STMPE811 GPIO interrupt */
priv->config->enable(priv->config, true);
}
/****************************************************************************
* Name: stmpe811_interrupt
*
* Description:
* The STMPE811 interrupt handler
*
****************************************************************************/
static int stmpe811_interrupt(int irq, FAR void *context)
{
FAR struct stmpe811_dev_s *priv;
FAR struct stmpe811_config_s *config;
int ret;
/* Which STMPE811 device caused the interrupt? */
#ifndef CONFIG_STMPE811_MULTIPLE
priv = &g_stmpe811;
#else
for (priv = g_stmpe811list;
priv && priv->config->irq != irq;
priv = priv->flink);
ASSERT(priv != NULL);
#endif
/* Get a pointer the callbacks for convenience (and so the code is not so
* ugly).
*/
config = priv->config;
DEBUGASSERT(config != NULL);
/* Disable further interrupts */
config->enable(config, false);
/* Check if interrupt work is already queue. If it is already busy, then
* we already have interrupt processing in the pipeline and we need to do
* nothing more.
*/
if (work_available(&priv->work))
{
/* Yes.. Transfer processing to the worker thread. Since STMPE811
* interrupts are disabled while the work is pending, no special
* action should be required to protect the work queue.
*/
ret = work_queue(HPWORK, &priv->work, stmpe811_worker, priv, 0);
if (ret != 0)
{
illdbg("Failed to queue work: %d\n", ret);
}
}
/* Clear any pending interrupts and return success */
config->clear(config);
return OK;
}
/****************************************************************************
* Name: stmpe811_checkid
*
* Description:
* Read and verify the STMPE811 chip ID
*
****************************************************************************/
static int stmpe811_checkid(FAR struct stmpe811_dev_s *priv)
{
uint16_t devid = 0;
/* Read device ID */
devid = stmpe811_getreg8(priv, STMPE811_CHIP_ID);
devid = (uint32_t)(devid << 8);
devid |= (uint32_t)stmpe811_getreg8(priv, STMPE811_CHIP_ID+1);
ivdbg("devid: %04x\n", devid);
if (devid != (uint16_t)CHIP_ID)
{
/* ID is not Correct */
return -ENODEV;
}
return OK;
}
/****************************************************************************
* Name: stmpe811_reset
*
* Description:
* Reset the STMPE811
*
****************************************************************************/
static void stmpe811_reset(FAR struct stmpe811_dev_s *priv)
{
/* Power Down the STMPE811 */
stmpe811_putreg8(priv, STMPE811_SYS_CTRL1, SYS_CTRL1_SOFTRESET);
/* Wait a bit */
usleep(20*1000);
/* Then power on again. All registers will be in their reset state. */
stmpe811_putreg8(priv, STMPE811_SYS_CTRL1, 0);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stmpe811_instantiate
*
* Description:
* Instantiate and configure the STMPE811 device driver to use the provided
* I2C or SPIdevice instance.
*
* Input Parameters:
* dev - An I2C or SPI driver instance
* config - Persistant board configuration data
*
* Returned Value:
* A non-zero handle is returned on success. This handle may then be used
* to configure the STMPE811 driver as necessary. A NULL handle value is
* returned on failure.
*
****************************************************************************/
#ifdef CONFIG_STMPE811_SPI
STMPE811_HANDLE stmpe811_instantiate(FAR struct spi_dev_s *dev,
FAR struct stmpe811_config_s *config)
#else
STMPE811_HANDLE stmpe811_instantiate(FAR struct i2c_master_s *dev,
FAR struct stmpe811_config_s *config)
#endif
{
FAR struct stmpe811_dev_s *priv;
uint8_t regval;
int ret;
/* Allocate the device state structure */
#ifdef CONFIG_STMPE811_MULTIPLE
priv = (FAR struct stmpe811_dev_s *)kmm_zalloc(sizeof(struct stmpe811_dev_s));
if (!priv)
{
return NULL;
}
/* And save the device structure in the list of STMPE811 so that we can find it later */
priv->flink = g_stmpe811list;
g_stmpe811list = priv;
#else
/* Use the one-and-only STMPE811 driver instance */
priv = &g_stmpe811;
#endif
/* Initialize the device state structure */
sem_init(&priv->exclsem, 0, 1);
priv->config = config;
#ifdef CONFIG_STMPE811_SPI
priv->spi = dev;
#else
priv->i2c = dev;
/* Set the I2C address and frequency. REVISIT: This logic would be
* insufficient if we share the I2C bus with any other devices that also
* modify the address and frequency.
*/
I2C_SETADDRESS(dev, config->address, 7);
I2C_SETFREQUENCY(dev, config->frequency);
#endif
/* Read and verify the STMPE811 chip ID */
ret = stmpe811_checkid(priv);
if (ret < 0)
{
#ifdef CONFIG_STMPE811_MULTIPLE
g_stmpe811list = priv->flink;
kmm_free(priv);
#endif
return NULL;
}
/* Generate STMPE811 Software reset */
stmpe811_reset(priv);
/* Configure the interrupt output pin to generate interrupts on high or low level. */
regval = stmpe811_getreg8(priv, STMPE811_INT_CTRL);
#ifdef CONFIG_STMPE811_ACTIVELOW
regval &= ~INT_CTRL_INT_POLARITY; /* Pin polarity: Active low / falling edge */
#else
regval |= INT_CTRL_INT_POLARITY; /* Pin polarity: Active high / rising edge */
#endif
#ifdef CONFIG_STMPE811_EDGE
regval |= INT_CTRL_INT_TYPE; /* Edge interrupt */
#else
regval &= ~INT_CTRL_INT_TYPE; /* Level interrupt */
#endif
stmpe811_putreg8(priv, STMPE811_INT_CTRL, regval);
/* Attach the STMPE811 interrupt handler. */
config->attach(config, stmpe811_interrupt);
/* Clear any pending interrupts */
stmpe811_putreg8(priv, STMPE811_INT_STA, INT_ALL);
config->clear(config);
config->enable(config, true);
/* Enable global interrupts */
regval = stmpe811_getreg8(priv, STMPE811_INT_CTRL);
regval |= INT_CTRL_GLOBAL_INT;
stmpe811_putreg8(priv, STMPE811_INT_CTRL, regval);
/* Return our private data structure as an opaque handle */
return (STMPE811_HANDLE)priv;
}
/****************************************************************************
* Name: stmpe811_getreg8
*
* Description:
* Read from an 8-bit STMPE811 register
*
****************************************************************************/
#ifdef CONFIG_STMPE811_I2C
uint8_t stmpe811_getreg8(FAR struct stmpe811_dev_s *priv, uint8_t regaddr)
{
/* 8-bit data read sequence:
*
* Start - I2C_Write_Address - STMPE811_Reg_Address -
* Repeated_Start - I2C_Read_Address - STMPE811_Read_Data - STOP
*/
struct i2c_msg_s msg[2];
uint8_t regval;
int ret;
/* Setup 8-bit STMPE811 address write message */
msg[0].addr = priv->config->address; /* 7-bit address */
msg[0].flags = 0; /* Write transaction, beginning with START */
msg[0].buffer = &regaddr; /* Transfer from this address */
msg[0].length = 1; /* Send one byte following the address
* (no STOP) */
/* Set up the 8-bit STMPE811 data read message */
msg[1].addr = priv->config->address; /* 7-bit address */
msg[1].flags = I2C_M_READ; /* Read transaction, beginning with Re-START */
msg[1].buffer = &regval; /* Transfer to this address */
msg[1].length = 1; /* Receive one byte following the address
* (then STOP) */
/* Perform the transfer */
ret = I2C_TRANSFER(priv->i2c, msg, 2);
if (ret < 0)
{
idbg("I2C_TRANSFER failed: %d\n", ret);
return 0;
}
#ifdef CONFIG_STMPE811_REGDEBUG
dbg("%02x->%02x\n", regaddr, regval);
#endif
return regval;
}
#endif
/****************************************************************************
* Name: stmpe811_putreg8
*
* Description:
* Write a value to an 8-bit STMPE811 register
*
****************************************************************************/
#ifdef CONFIG_STMPE811_I2C
void stmpe811_putreg8(FAR struct stmpe811_dev_s *priv,
uint8_t regaddr, uint8_t regval)
{
/* 8-bit data read sequence:
*
* Start - I2C_Write_Address - STMPE811_Reg_Address - STMPE811_Write_Data - STOP
*/
struct i2c_msg_s msg;
uint8_t txbuffer[2];
int ret;
#ifdef CONFIG_STMPE811_REGDEBUG
dbg("%02x<-%02x\n", regaddr, regval);
#endif
/* Setup to the data to be transferred. Two bytes: The STMPE811 register
* address followed by one byte of data.
*/
txbuffer[0] = regaddr;
txbuffer[1] = regval;
/* Setup 8-bit STMPE811 address write message */
msg.addr = priv->config->address; /* 7-bit address */
msg.flags = 0; /* Write transaction, beginning with START */
msg.buffer = txbuffer; /* Transfer from this address */
msg.length = 2; /* Send two byte following the address
* (then STOP) */
/* Perform the transfer */
ret = I2C_TRANSFER(priv->i2c, &msg, 1);
if (ret < 0)
{
idbg("I2C_TRANSFER failed: %d\n", ret);
}
}
#endif
/****************************************************************************
* Name: stmpe811_getreg16
*
* Description:
* Read 16-bits of data from an STMPE-11 register
*
****************************************************************************/
#ifdef CONFIG_STMPE811_I2C
uint16_t stmpe811_getreg16(FAR struct stmpe811_dev_s *priv, uint8_t regaddr)
{
/* 16-bit data read sequence:
*
* Start - I2C_Write_Address - STMPE811_Reg_Address -
* Repeated_Start - I2C_Read_Address - STMPE811_Read_Data_1 -
* STMPE811_Read_Data_2 - STOP
*/
struct i2c_msg_s msg[2];
uint8_t rxbuffer[2];
int ret;
/* Setup 8-bit STMPE811 address write message */
msg[0].addr = priv->config->address; /* 7-bit address */
msg[0].flags = 0; /* Write transaction, beginning with START */
msg[0].buffer = &regaddr; /* Transfer from this address */
msg[0].length = 1; /* Send one byte following the address
* (no STOP) */
/* Set up the 8-bit STMPE811 data read message */
msg[1].addr = priv->config->address; /* 7-bit address */
msg[1].flags = I2C_M_READ; /* Read transaction, beginning with Re-START */
msg[1].buffer = rxbuffer; /* Transfer to this address */
msg[1].length = 2; /* Receive two bytes following the address
* (then STOP) */
/* Perform the transfer */
ret = I2C_TRANSFER(priv->i2c, msg, 2);
if (ret < 0)
{
idbg("I2C_TRANSFER failed: %d\n", ret);
return 0;
}
#ifdef CONFIG_STMPE811_REGDEBUG
dbg("%02x->%02x%02x\n", regaddr, rxbuffer[0], rxbuffer[1]);
#endif
return (uint16_t)rxbuffer[0] << 8 | (uint16_t)rxbuffer[1];
}
#endif
#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 */
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