568 lines
17 KiB
C
568 lines
17 KiB
C
/****************************************************************************
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* drivers/input/stmpe811_base.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* References:
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* "STMPE811 S-Touch advanced resistive touchscreen controller with 8-bit
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* GPIO expander," Doc ID 14489 Rev 6, CD00186725, STMicroelectronics"
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/signal.h>
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#include <nuttx/input/stmpe811.h>
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#include "stmpe811.h"
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#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811)
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* If only a single STMPE811 device is supported, then the driver state
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* structure may as well be pre-allocated.
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*/
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#ifndef CONFIG_STMPE811_MULTIPLE
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static struct stmpe811_dev_s g_stmpe811;
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/* Otherwise, we will need to maintain allocated driver instances in a list */
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#else
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static struct stmpe811_dev_s *g_stmpe811list;
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stmpe811_worker
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*
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* Description:
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* This is the "bottom half" of the STMPE811 interrupt handler
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*
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****************************************************************************/
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static void stmpe811_worker(FAR void *arg)
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{
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FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)arg;
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uint8_t regval;
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DEBUGASSERT(priv && priv->config);
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/* Get the global interrupt status */
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regval = stmpe811_getreg8(priv, STMPE811_INT_STA);
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/* Check for a touchscreen interrupt */
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#ifndef CONFIG_STMPE811_TSC_DISABLE
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if ((regval & (INT_TOUCH_DET | INT_FIFO_TH | INT_FIFO_OFLOW)) != 0)
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{
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/* Dispatch the touchscreen interrupt if it was brought into the link */
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#ifdef CONFIG_HAVE_WEAKFUNCTIONS
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if (stmpe811_tscworker)
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#endif
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{
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stmpe811_tscworker(priv, regval);
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}
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stmpe811_putreg8(priv, STMPE811_INT_STA,
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(INT_TOUCH_DET | INT_FIFO_TH | INT_FIFO_OFLOW));
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regval &= ~(INT_TOUCH_DET | INT_FIFO_TH | INT_FIFO_OFLOW);
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}
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#endif
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#if !defined(CONFIG_STMPE811_GPIO_DISABLE) && !defined(CONFIG_STMPE811_GPIOINT_DISABLE)
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if ((regval & INT_GPIO) != 0)
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{
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/* Dispatch the GPIO interrupt if it was brought into the link */
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#ifdef CONFIG_HAVE_WEAKFUNCTIONS
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if (stmpe811_gpioworker)
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#endif
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{
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stmpe811_gpioworker(priv);
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}
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stmpe811_putreg8(priv, STMPE811_INT_STA, INT_GPIO);
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regval &= ~INT_GPIO;
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}
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#endif
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/* Clear any other residual, unhandled pending interrupt */
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if (regval != 0)
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{
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stmpe811_putreg8(priv, STMPE811_INT_STA, regval);
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}
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/* Re-enable the STMPE811 GPIO interrupt */
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priv->config->enable(priv->config, true);
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}
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/****************************************************************************
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* Name: stmpe811_interrupt
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*
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* Description:
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* The STMPE811 interrupt handler
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*
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****************************************************************************/
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static int stmpe811_interrupt(int irq, FAR void *context, FAR void *arg)
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{
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FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)arg;
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FAR struct stmpe811_config_s *config;
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int ret;
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DEBUGASSERT(priv != NULL && priv->config != NULL);
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config = priv->config;
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/* Disable further interrupts */
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config->enable(config, false);
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/* Check if interrupt work is already queue. If it is already busy, then
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* we already have interrupt processing in the pipeline and we need to do
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* nothing more.
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*/
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if (work_available(&priv->work))
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{
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/* Yes.. Transfer processing to the worker thread. Since STMPE811
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* interrupts are disabled while the work is pending, no special
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* action should be required to protect the work queue.
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*/
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ret = work_queue(HPWORK, &priv->work, stmpe811_worker, priv, 0);
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if (ret != 0)
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{
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ierr("ERROR: Failed to queue work: %d\n", ret);
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}
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}
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/* Clear any pending interrupts and return success */
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config->clear(config);
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return OK;
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}
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/****************************************************************************
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* Name: stmpe811_checkid
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*
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* Description:
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* Read and verify the STMPE811 chip ID
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*
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****************************************************************************/
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static int stmpe811_checkid(FAR struct stmpe811_dev_s *priv)
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{
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uint16_t devid = 0;
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/* Read device ID */
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devid = stmpe811_getreg8(priv, STMPE811_CHIP_ID);
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devid = (uint32_t)(devid << 8);
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devid |= (uint32_t)stmpe811_getreg8(priv, STMPE811_CHIP_ID + 1);
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iinfo("devid: %04x\n", devid);
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if (devid != (uint16_t)CHIP_ID)
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{
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/* ID is not Correct */
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return -ENODEV;
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}
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return OK;
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}
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/****************************************************************************
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* Name: stmpe811_reset
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*
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* Description:
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* Reset the STMPE811
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*
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****************************************************************************/
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static void stmpe811_reset(FAR struct stmpe811_dev_s *priv)
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{
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/* Power Down the STMPE811 */
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stmpe811_putreg8(priv, STMPE811_SYS_CTRL1, SYS_CTRL1_SOFTRESET);
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/* Wait a bit */
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nxsig_usleep(20 * 1000);
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/* Then power on again. All registers will be in their reset state. */
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stmpe811_putreg8(priv, STMPE811_SYS_CTRL1, 0);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stmpe811_instantiate
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*
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* Description:
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* Instantiate and configure the STMPE811 device driver to use the provided
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* I2C or SPIdevice instance.
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*
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* Input Parameters:
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* dev - An I2C or SPI driver instance
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* config - Persistent board configuration data
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*
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* Returned Value:
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* A non-zero handle is returned on success. This handle may then be used
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* to configure the STMPE811 driver as necessary. A NULL handle value is
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* returned on failure.
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*
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****************************************************************************/
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#ifdef CONFIG_STMPE811_SPI
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STMPE811_HANDLE stmpe811_instantiate(FAR struct spi_dev_s *dev,
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FAR struct stmpe811_config_s *config)
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#else
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STMPE811_HANDLE stmpe811_instantiate(FAR struct i2c_master_s *dev,
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FAR struct stmpe811_config_s *config)
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#endif
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{
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FAR struct stmpe811_dev_s *priv;
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uint8_t regval;
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int ret;
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/* Allocate the device state structure */
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#ifdef CONFIG_STMPE811_MULTIPLE
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priv = (FAR struct stmpe811_dev_s *)kmm_zalloc(
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sizeof(struct stmpe811_dev_s));
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if (!priv)
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{
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return NULL;
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}
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/* And save the device structure in the list of STMPE811 so that we can
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* find it later.
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*/
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priv->flink = g_stmpe811list;
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g_stmpe811list = priv;
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#else
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/* Use the one-and-only STMPE811 driver instance */
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priv = &g_stmpe811;
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#endif
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/* Initialize the device state structure */
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nxsem_init(&priv->exclsem, 0, 1);
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priv->config = config;
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#ifdef CONFIG_STMPE811_SPI
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priv->spi = dev;
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#else
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priv->i2c = dev;
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#endif
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/* Read and verify the STMPE811 chip ID */
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ret = stmpe811_checkid(priv);
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if (ret < 0)
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{
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#ifdef CONFIG_STMPE811_MULTIPLE
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g_stmpe811list = priv->flink;
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kmm_free(priv);
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#endif
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return NULL;
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}
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/* Generate STMPE811 Software reset */
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stmpe811_reset(priv);
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/* Configure the interrupt output pin to generate interrupts on high or
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* low level.
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*/
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regval = stmpe811_getreg8(priv, STMPE811_INT_CTRL);
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#ifdef CONFIG_STMPE811_ACTIVELOW
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regval &= ~INT_CTRL_INT_POLARITY; /* Pin polarity: Active low / falling edge */
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#else
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regval |= INT_CTRL_INT_POLARITY; /* Pin polarity: Active high / rising edge */
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#endif
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#ifdef CONFIG_STMPE811_EDGE
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regval |= INT_CTRL_INT_TYPE; /* Edge interrupt */
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#else
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regval &= ~INT_CTRL_INT_TYPE; /* Level interrupt */
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#endif
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stmpe811_putreg8(priv, STMPE811_INT_CTRL, regval);
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/* Attach the STMPE811 interrupt handler. */
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config->attach(config, stmpe811_interrupt, priv);
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/* Clear any pending interrupts */
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stmpe811_putreg8(priv, STMPE811_INT_STA, INT_ALL);
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config->clear(config);
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config->enable(config, true);
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/* Enable global interrupts */
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regval = stmpe811_getreg8(priv, STMPE811_INT_CTRL);
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regval |= INT_CTRL_GLOBAL_INT;
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stmpe811_putreg8(priv, STMPE811_INT_CTRL, regval);
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/* Return our private data structure as an opaque handle */
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return (STMPE811_HANDLE)priv;
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}
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/****************************************************************************
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* Name: stmpe811_getreg8
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*
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* Description:
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* Read from an 8-bit STMPE811 register
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*
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****************************************************************************/
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uint8_t stmpe811_getreg8(FAR struct stmpe811_dev_s *priv, uint8_t regaddr)
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{
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/* 8-bit data read sequence:
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* i2c:
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* Start - I2C_Write_Address - STMPE811_Reg_Address -
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* Repeated_Start - I2C_Read_Address - STMPE811_Read_Data - STOP
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* spi:
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* [STMPE811_Reg_Address | 0x80] - Dummy Address - Read Register
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*/
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uint8_t regval;
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#ifdef CONFIG_STMPE811_I2C
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int ret;
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struct i2c_msg_s msg[2];
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/* Setup 8-bit STMPE811 address write message */
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msg[0].frequency = priv->config->frequency; /* I2C frequency */
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msg[0].addr = priv->config->address; /* 7-bit address */
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msg[0].flags = 0; /* Write transaction, beginning with START */
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msg[0].buffer = ®addr; /* Transfer from this address */
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msg[0].length = 1; /* Send one byte following the address
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* (no STOP) */
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/* Set up the 8-bit STMPE811 data read message */
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msg[1].frequency = priv->config->frequency; /* I2C frequency */
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msg[1].addr = priv->config->address; /* 7-bit address */
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msg[1].flags = I2C_M_READ; /* Read transaction, beginning with Re-START */
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msg[1].buffer = ®val; /* Transfer to this address */
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msg[1].length = 1; /* Receive one byte following the address
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* (then STOP) */
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/* Perform the transfer */
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ret = I2C_TRANSFER(priv->i2c, msg, 2);
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if (ret < 0)
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{
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ierr("ERROR: I2C_TRANSFER failed: %d\n", ret);
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return 0;
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}
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#else /* CONFIG_STMPE811_SPI */
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SPI_LOCK(priv->spi, true);
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SPI_SETMODE(priv->spi, SPIDEV_MODE0);
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SPI_SETBITS(priv->spi, 8);
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SPI_HWFEATURES(priv->spi, 0);
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SPI_SETFREQUENCY(priv->spi, priv->config->frequency);
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SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
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SPI_SEND(priv->spi, regaddr | 0x80); /* Issue a read on the address */
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SPI_SEND(priv->spi, 0); /* Next address (not used) */
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regval = SPI_SEND(priv->spi, 0); /* Read register */
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SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
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SPI_LOCK(priv->spi, false);
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#endif
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#ifdef CONFIG_STMPE811_REGDEBUG
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_err("%02x->%02x\n", regaddr, regval);
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#endif
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return regval;
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}
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/****************************************************************************
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* Name: stmpe811_putreg8
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*
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* Description:
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* Write a value to an 8-bit STMPE811 register
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*
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****************************************************************************/
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void stmpe811_putreg8(FAR struct stmpe811_dev_s *priv,
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uint8_t regaddr, uint8_t regval)
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{
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/* 8-bit data read sequence:
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*
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* Start - I2C_Write_Address - STMPE811_Reg_Address -
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* STMPE811_Write_Data - STOP
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* spi:
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* STMPE811_Reg_Address - Dummy Address - Write Data
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*/
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#ifdef CONFIG_STMPE811_I2C
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int ret;
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struct i2c_msg_s msg;
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uint8_t txbuffer[2];
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#ifdef CONFIG_STMPE811_REGDEBUG
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_err("%02x<-%02x\n", regaddr, regval);
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#endif
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/* Setup to the data to be transferred. Two bytes: The STMPE811 register
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* address followed by one byte of data.
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*/
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txbuffer[0] = regaddr;
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txbuffer[1] = regval;
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/* Setup 8-bit STMPE811 address write message */
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msg.frequency = priv->config->frequency; /* I2C frequency */
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msg.addr = priv->config->address; /* 7-bit address */
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msg.flags = 0; /* Write transaction, beginning with START */
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msg.buffer = txbuffer; /* Transfer from this address */
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msg.length = 2; /* Send two byte following the address
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* (then STOP) */
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/* Perform the transfer */
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ret = I2C_TRANSFER(priv->i2c, &msg, 1);
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if (ret < 0)
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{
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ierr("ERROR: I2C_TRANSFER failed: %d\n", ret);
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}
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#else /* CONFIG_STMPE811_SPI */
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SPI_LOCK(priv->spi, true);
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SPI_SETMODE(priv->spi, SPIDEV_MODE0);
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SPI_SETBITS(priv->spi, 8);
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SPI_HWFEATURES(priv->spi, 0);
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SPI_SETFREQUENCY(priv->spi, priv->config->frequency);
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SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
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SPI_SEND(priv->spi, regaddr); /* Issue a read on the address */
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SPI_SEND(priv->spi, 0); /* Next address (not used) */
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SPI_SEND(priv->spi, regval); /* write register */
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SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false);
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SPI_LOCK(priv->spi, false);
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#endif
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}
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/****************************************************************************
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* Name: stmpe811_getreg16
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*
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* Description:
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* Read 16-bits of data from an STMPE-11 register
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*
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****************************************************************************/
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uint16_t stmpe811_getreg16(FAR struct stmpe811_dev_s *priv, uint8_t regaddr)
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{
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/* 16-bit data read sequence:
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* i2c:
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* Start - I2C_Write_Address - STMPE811_Reg_Address -
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* Repeated_Start - I2C_Read_Address - STMPE811_Read_Data_1 -
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* STMPE811_Read_Data_2 - STOP
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* spi:
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* 16 bit registers are MSB.
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* [STMPE811_Reg_Address | 0x80] - [STMPE811_Reg_Address + 1 | 0x80] -
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* Read Register - Read Register + 1
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*/
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uint8_t rxbuffer[2];
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#ifdef CONFIG_STMPE811_I2C
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int ret;
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struct i2c_msg_s msg[2];
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/* Setup 8-bit STMPE811 address write message */
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msg[0].frequency = priv->config->frequency; /* I2C frequency */
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msg[0].addr = priv->config->address; /* 7-bit address */
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msg[0].flags = 0; /* Write transaction, beginning with START */
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msg[0].buffer = ®addr; /* Transfer from this address */
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msg[0].length = 1; /* Send one byte following the address
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* (no STOP) */
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/* Set up the 8-bit STMPE811 data read message */
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msg[1].frequency = priv->config->frequency; /* I2C frequency */
|
|
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)
|
|
{
|
|
ierr("ERROR: I2C_TRANSFER failed: %d\n", ret);
|
|
return 0;
|
|
}
|
|
#else /* CONFIG_STMPE811_SPI */
|
|
|
|
SPI_LOCK(priv->spi, true);
|
|
|
|
SPI_SETMODE(priv->spi, SPIDEV_MODE0);
|
|
SPI_SETBITS(priv->spi, 8);
|
|
SPI_HWFEATURES(priv->spi, 0);
|
|
SPI_SETFREQUENCY(priv->spi, priv->config->frequency);
|
|
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
|
|
SPI_SEND(priv->spi, regaddr | 0x80); /* Issue a read on the address */
|
|
SPI_SEND(priv->spi, regaddr + 1); /* Next address */
|
|
rxbuffer[0] = SPI_SEND(priv->spi, 0); /* Read MSB */
|
|
rxbuffer[1] = SPI_SEND(priv->spi, 0); /* Read LSB */
|
|
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), true);
|
|
SPI_LOCK(priv->spi, false);
|
|
#endif
|
|
#ifdef CONFIG_STMPE811_REGDEBUG
|
|
_err("%02x->%02x%02x\n", regaddr, rxbuffer[0], rxbuffer[1]);
|
|
#endif
|
|
return (uint16_t)rxbuffer[0] << 8 | (uint16_t)rxbuffer[1];
|
|
}
|
|
|
|
#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 */
|