/**************************************************************************** * drivers/input/stmpe811_base.c * * Copyright (C) 2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #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_dev_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 *)kzalloc(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 kfree(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 = ®addr; /* 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 = ®val; /* 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 = ®addr; /* 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 */