6a3c2aded6
* Simplify EINTR/ECANCEL error handling 1. Add semaphore uninterruptible wait function 2 .Replace semaphore wait loop with a single uninterruptible wait 3. Replace all sem_xxx to nxsem_xxx * Unify the void cast usage 1. Remove void cast for function because many place ignore the returned value witout cast 2. Replace void cast for variable with UNUSED macro
275 lines
8.8 KiB
C
275 lines
8.8 KiB
C
/****************************************************************************
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* boards/arm/sam34/sam4e-ek/src/sam_ads7843e.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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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 <stdbool.h>
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#include <stdio.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/board.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/input/touchscreen.h>
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#include <nuttx/input/ads7843e.h>
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#include "sam_gpio.h"
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#include "sam_spi.h"
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#include "sam4e-ek.h"
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#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifndef CONFIG_SAM34_SPI0
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# error "Touchscreen support requires CONFIG_SAM34_SPI0"
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#endif
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#ifndef CONFIG_SAM34_GPIOA_IRQ
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# error "Touchscreen support requires CONFIG_SAM34_GPIOA_IRQ"
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#endif
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#ifndef CONFIG_ADS7843E_FREQUENCY
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# define CONFIG_ADS7843E_FREQUENCY 500000
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#endif
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#ifndef CONFIG_ADS7843E_SPIDEV
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# define CONFIG_ADS7843E_SPIDEV TSC_CSNUM
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#endif
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#if CONFIG_ADS7843E_SPIDEV != TSC_CSNUM
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# error "CONFIG_ADS7843E_SPIDEV must have the same value as TSC_CSNUM"
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#endif
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#ifndef CONFIG_ADS7843E_DEVMINOR
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# define CONFIG_ADS7843E_DEVMINOR 0
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#endif
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/****************************************************************************
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* Static Function Prototypes
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the ADS7843E driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the ADS7843E interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* pendown - Return the state of the pen down GPIO input
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*/
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static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr);
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static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable);
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static void tsc_clear(FAR struct ads7843e_config_s *state);
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static bool tsc_busy(FAR struct ads7843e_config_s *state);
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static bool tsc_pendown(FAR struct ads7843e_config_s *state);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* A reference to a structure of this type must be passed to the ADS7843E
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* driver. This structure provides information about the configuration
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* of the ADS7843E and provides some board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the driver and is presumed to persist while the driver is active. The
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* memory must be writeable because, under certain circumstances, the driver
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* may modify frequency or X plate resistance values.
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*/
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static struct ads7843e_config_s g_tscinfo =
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{
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.frequency = CONFIG_ADS7843E_FREQUENCY,
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.attach = tsc_attach,
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.enable = tsc_enable,
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.clear = tsc_clear,
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.busy = tsc_busy,
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.pendown = tsc_pendown,
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the ADS7843E driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the ADS7843E interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* pendown - Return the state of the pen down GPIO input
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*/
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static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr)
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{
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/* Attach the ADS7843E interrupt */
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iinfo("Attaching %p to IRQ %d\n", isr, SAM_TCS_IRQ);
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return irq_attach(SAM_TCS_IRQ, isr, NULL);
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}
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static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable)
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{
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/* Attach and enable, or detach and disable */
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iinfo("IRQ:%d enable:%d\n", SAM_TCS_IRQ, enable);
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if (enable)
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{
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sam_gpioirqenable(SAM_TCS_IRQ);
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}
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else
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{
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sam_gpioirqdisable(SAM_TCS_IRQ);
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}
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}
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static void tsc_clear(FAR struct ads7843e_config_s *state)
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{
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/* Does nothing */
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}
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static bool tsc_busy(FAR struct ads7843e_config_s *state)
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{
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#if defined(CONFIG_DEBUG_INPUT) && defined(CONFIG_DEBUG_INFO)
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static bool last = (bool)-1;
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#endif
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/* BUSY is high impedance when CS is high (not selected). When CS is
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* is low, BUSY is active high.
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*/
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bool busy = sam_gpioread(GPIO_TCS_BUSY);
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#if defined(CONFIG_DEBUG_INPUT) && defined(CONFIG_DEBUG_INFO)
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if (busy != last)
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{
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iinfo("busy:%d\n", busy);
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last = busy;
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}
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#endif
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return busy;
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}
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static bool tsc_pendown(FAR struct ads7843e_config_s *state)
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{
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/* The /PENIRQ value is active low */
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bool pendown = !sam_gpioread(GPIO_TCS_IRQ);
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iinfo("pendown:%d\n", pendown);
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return pendown;
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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: sam_tsc_setup
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*
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* Description:
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* This function is called by board-bringup logic to configure the
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* touchscreen device. This function will register the driver as
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* /dev/inputN where N is the minor device number.
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*
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* Input Parameters:
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* minor - The input device minor number
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int sam_tsc_setup(int minor)
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{
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FAR struct spi_dev_s *dev;
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int ret;
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iinfo("minor %d\n", minor);
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DEBUGASSERT(minor == 0);
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/* Configure and enable the ADS7843E interrupt pin as an input */
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sam_configgpio(GPIO_TCS_BUSY);
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sam_configgpio(GPIO_TCS_IRQ);
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/* Configure the PIO interrupt */
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sam_gpioirq(GPIO_TCS_IRQ);
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/* Get an instance of the SPI interface for the touchscreen chip select */
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dev = sam_spibus_initialize(TSC_CSNUM);
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if (!dev)
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{
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ierr("ERROR: Failed to initialize SPI chip select %d\n", TSC_CSNUM);
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return -ENODEV;
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}
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/* Initialize and register the SPI touschscreen device */
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ret = ads7843e_register(dev, &g_tscinfo, CONFIG_ADS7843E_DEVMINOR);
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if (ret < 0)
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{
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ierr("ERROR: Failed to initialize SPI chip select %d\n", TSC_CSNUM);
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/* sam_spibus_uninitialize(dev); */
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return -ENODEV;
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}
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return OK;
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}
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#endif /* CONFIG_INPUT && CONFIG_INPUT_ADS7843E */
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