/**************************************************************************** * drivers/input/stmpe811_base.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /* References: * "STMPE811 S-Touch advanced resistive touchscreen controller with 8-bit * GPIO expander," Doc ID 14489 Rev 6, CD00186725, STMicroelectronics" */ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include "stmpe811.h" #if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811) /**************************************************************************** * 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 void *arg) { FAR struct stmpe811_dev_s *priv = (FAR struct stmpe811_dev_s *)arg; FAR struct stmpe811_config_s *config; int ret; DEBUGASSERT(priv != NULL && priv->config != NULL); config = priv->config; /* 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) { ierr("ERROR: 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); iinfo("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 */ nxsig_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 - Persistent 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 = 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 */ nxmutex_init(&priv->lock); priv->config = config; #ifdef CONFIG_STMPE811_SPI priv->spi = dev; #else priv->i2c = dev; #endif /* Read and verify the STMPE811 chip ID */ ret = stmpe811_checkid(priv); if (ret < 0) { nxmutex_destroy(&priv->lock); #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, priv); /* 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 * ****************************************************************************/ uint8_t stmpe811_getreg8(FAR struct stmpe811_dev_s *priv, uint8_t regaddr) { /* 8-bit data read sequence: * i2c: * Start - I2C_Write_Address - STMPE811_Reg_Address - * Repeated_Start - I2C_Read_Address - STMPE811_Read_Data - STOP * spi: * [STMPE811_Reg_Address | 0x80] - Dummy Address - Read Register */ uint8_t regval; #ifdef CONFIG_STMPE811_I2C int ret; struct i2c_msg_s msg[2]; /* Setup 8-bit STMPE811 address write message */ msg[0].frequency = priv->config->frequency; /* I2C frequency */ 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].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 = ®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) { 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, 0); /* Next address (not used) */ regval = SPI_SEND(priv->spi, 0); /* Read register */ SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false); SPI_LOCK(priv->spi, false); #endif #ifdef CONFIG_STMPE811_REGDEBUG _err("%02x->%02x\n", regaddr, regval); #endif return regval; } /**************************************************************************** * Name: stmpe811_putreg8 * * Description: * Write a value to an 8-bit STMPE811 register * ****************************************************************************/ 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 * spi: * STMPE811_Reg_Address - Dummy Address - Write Data */ #ifdef CONFIG_STMPE811_I2C int ret; struct i2c_msg_s msg; uint8_t txbuffer[2]; #ifdef CONFIG_STMPE811_REGDEBUG _err("%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.frequency = priv->config->frequency; /* I2C frequency */ 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) { ierr("ERROR: I2C_TRANSFER failed: %d\n", ret); } #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); /* Issue a read on the address */ SPI_SEND(priv->spi, 0); /* Next address (not used) */ SPI_SEND(priv->spi, regval); /* write register */ SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN(0), false); SPI_LOCK(priv->spi, false); #endif } /**************************************************************************** * Name: stmpe811_getreg16 * * Description: * Read 16-bits of data from an STMPE-11 register * ****************************************************************************/ uint16_t stmpe811_getreg16(FAR struct stmpe811_dev_s *priv, uint8_t regaddr) { /* 16-bit data read sequence: * i2c: * Start - I2C_Write_Address - STMPE811_Reg_Address - * Repeated_Start - I2C_Read_Address - STMPE811_Read_Data_1 - * STMPE811_Read_Data_2 - STOP * spi: * 16 bit registers are MSB. * [STMPE811_Reg_Address | 0x80] - [STMPE811_Reg_Address + 1 | 0x80] - * Read Register - Read Register + 1 */ uint8_t rxbuffer[2]; #ifdef CONFIG_STMPE811_I2C int ret; struct i2c_msg_s msg[2]; /* Setup 8-bit STMPE811 address write message */ msg[0].frequency = priv->config->frequency; /* I2C frequency */ 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].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 */