/**************************************************************************** * drivers/input/stmpe811.h * * 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" */ #ifndef __DRIVERS_INPUT_STMPE811_H #define __DRIVERS_INPUT_STMPE811_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811) /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Configuration ************************************************************/ /* Reference counting is partially implemented, but not needed in the current * design. */ #undef CONFIG_STMPE811_REFCNT /* Driver support ***********************************************************/ /* This format is used to construct the /dev/input[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 /* STMPE811 Resources *******************************************************/ #ifndef CONFIG_STMPE811_TSC_DISABLE # define STMPE811_ADC_NPINS 4 /* Only pins 0-3 can be used for ADC */ # define STMPE811_GPIO_NPINS 4 /* Only pins 0-3 can be used as GPIOs */ #else # define STMPE811_ADC_NPINS 8 /* All pins can be used for ADC */ # define STMPE811_GPIO_NPINS 8 /* All pins can be used as GPIOs */ #endif /* Driver flags */ #define STMPE811_FLAGS_TSC_INITIALIZED (1 << 0) /* 1: The TSC block has been initialized */ #define STMPE811_FLAGS_GPIO_INITIALIZED (1 << 1) /* 1: The GIO block has been initialized */ #define STMPE811_FLAGS_ADC_INITIALIZED (1 << 2) /* 1: The ADC block has been initialized */ #define STMPE811_FLAGS_TS_INITIALIZED (1 << 3) /* 1: The TS block has been initialized */ /* Timeout to detect missing pen up events */ #define STMPE811_PENUP_TICKS MSEC2TICK(100) /**************************************************************************** * Public Types ****************************************************************************/ /* This describes the state of one contact */ enum stmpe811_contact_3 { CONTACT_NONE = 0, /* No contact */ CONTACT_DOWN, /* First contact */ CONTACT_MOVE, /* Same contact, possibly different position */ CONTACT_UP, /* Contact lost */ }; /* This structure describes the results of one STMPE811 sample */ struct stmpe811_sample_s { uint8_t id; /* Sampled touch point ID */ uint8_t contact; /* Contact state (see enum stmpe811_contact_e) */ bool valid; /* True: x,y,z contain valid, sampled data */ uint16_t x; /* Measured X position */ uint16_t y; /* Measured Y position */ uint8_t z; /* Measured Z index */ }; /* This structure represents the state of the STMPE811 driver */ struct stmpe811_dev_s { #ifdef CONFIG_STMPE811_MULTIPLE FAR struct stmpe811_dev_s *flink; /* Supports a singly linked list of drivers */ #endif /* Common fields */ FAR struct stmpe811_config_s *config; /* Board configuration data */ sem_t exclsem; /* Manages exclusive access to this structure */ #ifdef CONFIG_STMPE811_SPI FAR struct spi_dev_s *spi; /* Saved SPI driver instance */ #else FAR struct i2c_master_s *i2c; /* Saved I2C driver instance */ #endif uint8_t inuse; /* STMPE811 pins in use */ uint8_t flags; /* See STMPE811_FLAGS_* definitions */ struct work_s work; /* Supports the interrupt handling "bottom half" */ /* Fields that may be disabled to save size if touchscreen support * is not used. */ #ifndef CONFIG_STMPE811_TSC_DISABLE #ifdef CONFIG_STMPE811_REFCNT uint8_t crefs; /* Number of times the device has been opened */ #endif uint8_t nwaiters; /* Number of threads waiting for STMPE811 data */ uint8_t id; /* Current touch point ID */ uint8_t minor; /* Touchscreen minor device number */ volatile bool penchange; /* An unreported event is buffered */ uint16_t threshx; /* Thresholded X value */ uint16_t threshy; /* Thresholded Y value */ sem_t waitsem; /* Used to wait for the availability of data */ struct work_s timeout; /* Supports tiemeout work */ struct wdog_s wdog; /* Timeout to detect missing pen down events */ struct stmpe811_sample_s sample; /* Last sampled touch point data */ /* 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'. */ struct pollfd *fds[CONFIG_STMPE811_NPOLLWAITERS]; #endif /* Fields that may be disabled to save size of GPIO support is not used */ #if !defined(CONFIG_STMPE811_GPIO_DISABLE) && !defined(CONFIG_STMPE811_GPIOINT_DISABLE) stmpe811_handler_t handlers[STMPE811_GPIO_NPINS]; /* GPIO "interrupt handlers" */ #endif }; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: stmpe811_getreg8 * * Description: * Read from an 8-bit STMPE811 register * ****************************************************************************/ uint8_t stmpe811_getreg8(FAR struct stmpe811_dev_s *priv, uint8_t regaddr); /**************************************************************************** * 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); /**************************************************************************** * 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); /**************************************************************************** * Name: stmpe811_tscint * * Description: * Handle touchscreen interrupt events (this function actually executes in * the context of the worker thread). * ****************************************************************************/ #ifndef CONFIG_STMPE811_TSC_DISABLE void stmpe811_tscworker(FAR struct stmpe811_dev_s *priv, uint8_t intsta) weak_function; #endif /**************************************************************************** * Name: stmpe811_gpioworker * * Description: * Handle GPIO interrupt events (this function actually executes in the * context of the worker thread). * ****************************************************************************/ #if !defined(CONFIG_STMPE811_GPIO_DISABLE) && !defined(CONFIG_STMPE811_GPIOINT_DISABLE) void stmpe811_gpioworker(FAR struct stmpe811_dev_s *priv) weak_function; #endif #endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 */ #endif /* __DRIVERS_INPUT_STMPE811_H */